CN117242723A - Method for transmitting channel state information report, user equipment, processing device, and storage medium, and method and base station for receiving channel state information report - Google Patents

Abstract

UE: receiving a radio resource control configuration associated with the CSI report; receiving trigger information for triggering reporting of a CSI value set configured by a radio resource control configuration; determining measurement resources for CSI reporting and uplink resources for CSI reporting according to the radio resource configuration and the trigger information; and performing partial CSI reporting in which only a part of the CSI value set is calculated and the calculated CSI value is transmitted in the uplink resource, on the basis of which a time difference between the measurement resource and the uplink resource satisfies a predetermined condition.

Description

Method, user equipment, processing equipment and storage for sending channel status information reports Storage medium and method and base station for receiving channel status information report

Technical field

The present disclosure relates to a wireless communication system.

Background technique

Various technologies such as machine-to-machine (M2M) communication, machine-type communication (MTC), and various devices requiring high data throughput, such as smartphones and tablet personal computers (PCs), have emerged and spread. As a result, the data throughput required to be processed in cellular networks increases rapidly. To meet this rapidly increasing data throughput, carrier aggregation technology or cognitive radio technology to efficiently employ more frequency bands and multiple-input multiple-output to increase the data capacity sent on limited frequency resources have been developed (MIMO) technology or multi-base station (BS) cooperation technology.

As more and more communication devices require greater communication capacity, there is a need for enhanced mobile broadband (eMBB) communication relative to traditional radio access technology (RAT). In addition, massive machine-type communication (mMTC) that provides various services anytime and anywhere by connecting multiple devices and objects to each other is a major issue to be considered in next-generation communications.

Communication system designs that consider reliability and latency sensitive services/user equipment (UE) are also being discussed. The introduction of next-generation RAT is being discussed considering eMBB communication, mMTC, ultra-reliable low-latency communication (URLLC), etc.

Contents of the invention

technical problem

With the introduction of new radio communication technologies, the number of UEs to which the BS should provide services in a prescribed resource area continues to increase, and the amount of data and control information transmitted/received by the BS to/from the UEs provided by the BS also continues to increase. Increase. Since the amount of resources available for the BS to communicate with the UE is limited, there is a need for a new method for the BS to efficiently receive/transmit uplink/downlink data and/or uplink/downlink control information using limited radio resources. method. In other words, as the density of nodes and/or the density of UEs increases, a method of effectively using high-density nodes or high-density UEs for communication is needed.

There is also a need for a method of efficiently supporting various services with different requirements in a wireless communication system.

For applications whose performance is sensitive to latency/latency, overcoming latency or delay is an important challenge.

In order to support new services (eg, URLLC), a method of providing channel state information to the BS faster and with higher reliability is needed.

The objects to be achieved by utilizing the present disclosure are not limited to those specifically described above, and those skilled in the art will more clearly understand other objects not described herein from the following detailed description.

Technical solutions

In one aspect of the present disclosure, a method of sending a channel state information (CSI) report by a user equipment (UE) in a wireless communication system is provided. The method may include: receiving a radio resource control configuration related to a CSI report; receiving trigger information that triggers a report of a CSI value set configured by the radio resource control configuration; and determining for CSI based on the radio resource configuration and the trigger information the reported measurement resources and the uplink resources used for CSI reporting; and based on the time difference between the measurement resources and the uplink resources meeting predetermined conditions, performing a partial CSI report in which only a part of the CSI value set is calculated and in the uplink The calculated CSI value is sent on the resource.

In another aspect of the present disclosure, a UE configured to send a CSI report in a wireless communication system is provided. The UE may include: at least one transceiver; at least one processor; and at least one computer memory operably connected to the at least one processor and configured to store instructions, the instructions being When executed, the at least one processor is caused to perform operations. The operations may include: receiving radio resource control configuration related to CSI reporting; receiving trigger information that triggers reporting of a CSI value set configured by the radio resource control configuration; determining for Measurement resources for the CSI report and uplink resources for the CSI report; and based on the time difference between the measurement resources and the uplink resources meeting a predetermined condition, perform a partial CSI report in which only a part of the CSI value set is calculated and in the uplink The calculated CSI value is sent on the channel resource.

In another aspect of the present disclosure, a processing device in a wireless communication system is provided. The processing device may include: at least one processor; and at least one computer memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the The at least one processor performs operations. The operations may include: receiving a radio resource control configuration related to a CSI report; receiving trigger information that triggers a report of a CSI value set configured by the radio resource control configuration; determining a user based on the radio resource configuration and the trigger information. measurement resources for the CSI report and uplink resources for the CSI report; and based on the time difference between the measurement resources and the uplink resources meeting a predetermined condition, perform a partial CSI report in which only a part of the CSI value set is calculated and in the uplink The calculated CSI value is sent on the link resource.

In another aspect of the disclosure, a computer-readable storage medium is provided. The storage medium may be configured to store at least one program code including instructions that, when executed, cause at least one processor to perform operations. The operations may include: receiving a radio resource control configuration related to a CSI report; receiving trigger information that triggers a report of a CSI value set configured by the radio resource control configuration; determining a user based on the radio resource configuration and the trigger information. measurement resources for the CSI report and uplink resources for the CSI report; and based on the time difference between the measurement resources and the uplink resources meeting a predetermined condition, perform a partial CSI report in which only a part of the CSI value set is calculated, and The calculated CSI value is sent on the uplink resource.

In another aspect of the present disclosure, a computer program stored in a computer-readable storage medium is provided. The computer program may include at least one program code including instructions that, when executed, cause at least one processor to perform operations. The operations may include: receiving a radio resource control configuration related to a channel state information (CSI) report; receiving trigger information that triggers reporting of a set of CSI values configured by the radio resource control configuration; based on the radio resource configuration and Triggering information to determine measurement resources for CSI reporting and uplink resources for CSI reporting; and based on the time difference between the measurement resources and the uplink resources meeting a predetermined condition, performing a partial CSI report in which only the CSI value set is calculated and transmit the calculated CSI value on the uplink resource.

In another aspect of the present disclosure, a method of receiving a CSI report by a base station (BS) in a wireless communication system is provided. The method may include: sending a radio resource control configuration related to a CSI report to the UE; sending trigger information to the UE, the trigger information triggering a report of a CSI value set configured by the radio resource control configuration; receiving the trigger information, the The trigger information triggers reporting of the CSI value set configured by the radio resource control configuration; determines measurement resources for CSI reporting and uplink resources for CSI reporting based on the radio resource configuration and the triggering information; and based on the measurement resources and the uplink The time difference between the link resources satisfies a predetermined condition and a partial CSI report is received, where only a part of the CSI value set is received on the uplink resource.

In another aspect of the present disclosure, a BS configured to receive a CSI report in a wireless communication system is provided. The BS may include: at least one transceiver; at least one processor; and at least one computer memory operably connected to the at least one processor and configured to store instructions, the instructions being When executed, the at least one processor is caused to perform operations. The operations may include: sending a radio resource control configuration related to a CSI report to the UE; sending trigger information to the UE, the trigger information triggering a report of a CSI value set configured by the radio resource control configuration; receiving the trigger information, The trigger information triggers reporting of the CSI value set configured by the radio resource control configuration; determining measurement resources for CSI reporting and uplink resources for CSI reporting based on the radio resource configuration and the triggering information; and based on the measurement resources and The time difference between the uplink resources satisfies a predetermined condition and a partial CSI report is received, wherein only a part of the CSI value set is received on the uplink resources.

In various aspects of the present disclosure, the predetermined condition may include: the time difference is less than a predefined CSI calculation time T1 based on a full CSI report in which the entire configured CSI value set is calculated, and is greater than a time difference based on measurement resources for a partial CSI report. Ending time T2.

In each aspect of the disclosure, the operations may include performing or receiving a full CSI report based on the time difference being greater than T2, wherein the entire set of CSI values is calculated and the calculated set of CSI values is transmitted on the uplink resource.

In each aspect of the disclosure, the measurement resources may be no later than the uplink resources.

In each aspect of the present disclosure, radio resource control configuration may include CSI configuration for partial CSI reporting.

In each aspect of the present disclosure, with regard to the operations, performing the partial CSI report may include sending or receiving additional information regarding the partial CSI report on an uplink resource.

The above solutions are only some examples of the present disclosure, and those skilled in the art can deduce and understand various examples in which the technical features of the present disclosure are incorporated from the following detailed description.

beneficial effects

According to some implementations of the present disclosure, wireless communication signals can be efficiently transmitted/received. Therefore, the overall throughput of the wireless communication system can be improved.

According to some implementations of the present disclosure, various services with different requirements can be efficiently supported in a wireless communication system.

According to some implementations of the present disclosure, delays/delays generated during radio communications between communication devices may be reduced.

According to some implementations of the present disclosure, channel state information (CSI) processing time may be reduced.

According to some implementations of the present disclosure, CSI may be provided to a base station (BS) faster and with higher reliability.

According to some implementations of the present disclosure, user equipment (UE) may use less information for CSI reporting, and therefore, the BS may use fewer radio resources to achieve the same level of reliability, which may contribute to savings Overall uplink system resources.

Effects according to the present disclosure are not limited to those specifically described above, and those skilled in the art related to the present disclosure will more clearly understand other effects not described herein from the following detailed description.

Description of drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate examples of implementations of the disclosure and together with the detailed description serve to explain implementations of the disclosure:

Figure 1 shows an example of a communication system 1 to which implementations of the present disclosure are applied;

Figure 2 is a block diagram illustrating an example of a communication device capable of performing a method according to the present disclosure;

3 illustrates another example of a wireless device capable of performing implementations of the present disclosure;

Figure 4 shows an example of a frame structure used in a wireless communication system based on the 3rd Generation Partnership Project (3GPP);

Figure 5 illustrates the resource grid of time slots;

Figure 6 shows an example of physical downlink shared channel (PDSCH) time domain resource assignment caused by physical downlink control channel (PDCCH) and physical uplink shared channel (PUSCH) caused by PDCCH;

Figure 7 shows an example of multiplexing uplink control information (UCI) with PUSCH;

Figure 8 illustrates an operational flow of a UE according to some implementations of the present disclosure;

9 illustrates an example of partial channel state information (CSI) reporting in accordance with some implementations of the present disclosure;

Figure 10 illustrates another example of partial CSI reporting in accordance with some implementations of the present disclosure; and

Figure 11 illustrates an operational flow of a base station (BS) according to some implementations of the present disclosure.

Specific implementation method

Hereinafter, implementations according to the present disclosure will be described in detail with reference to the accompanying drawings. The detailed description that will be given below with reference to the appended drawings is intended to illustrate exemplary implementations of the disclosure, rather than to show the only implementations that can be implemented in accordance with the disclosure. The following detailed description includes specific details in order to provide a thorough understanding of the disclosure. However, it will be apparent to those skilled in the art that the present disclosure may be practiced without these specific details.

In some cases, known structures and devices may be omitted or shown in block diagram form to focus on important features of the structures and devices so as not to obscure the concepts of the present disclosure. The same reference numbers will be used throughout this disclosure to refer to the same or similar parts.

The following techniques, devices and systems can be applied to various wireless multiple access systems. For example, multiple access systems may include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) system, multi-carrier frequency division multiple access (MC-FDMA) system, etc. CDMA may be implemented via a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented through radio technologies such as Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), Enhanced Data Rates for GSM Evolution (EDGE) (ie, GERAN), and others. OFDMA can be specifically implemented through radio technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA), etc. UTRA is part of the Universal Mobile Telecommunications System (UMTS), and the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of E-UMTS using E-UTRA. 3GPP LTE uses OFDMA on the downlink (DL) and SC-FDMA on the uplink (UL). LTE-advanced (LTE-A) is an evolved version of 3GPP LTE.

For convenience of description, description will be given under the assumption that the present disclosure is applied to LTE and/or New RAT (NR). However, the technical features of the present disclosure are not limited thereto. For example, although the following detailed description is given based on a mobile communication system corresponding to the 3GPP LTE/NR system, the mobile communication system is applicable to any other mobile communication system except for matters specific to the 3GPP LTE/NR system.

For terms and technologies that are not described in detail among the terms and technologies used in this disclosure, reference may be made to 3GPP-based standard specifications (for example, 3GPP TS 36.211, 3GPP TS 36.212, 3GPP TS 36.213, 3GPP TS36.321, 3GPP TS 36.300 , 3GPP TS 36.331, 3GPP TS 37.213, 3GPP TS 38.211, 3GPP TS38.212, 3GPP TS 38.213, 3GPP TS 38.214, 3GPP TS 38.300, 3GPP TS 38.331, etc.).

In examples of the present disclosure described later, if a device "assumes" something, this may mean that the channel transmission entity transmits the channel in compliance with the corresponding "assumption". This may also mean that the channel receiving entity receives or decodes the channel in a form that conforms to the "assumption", subject to the "assumption" that the channel was sent.

In this disclosure, user equipment (UE) may be fixed or mobile. Each of the various devices that transmit and/or receive user data and/or control information by communicating with a base station (BS) may be a UE. The term UE may be referred to as terminal equipment, mobile station (MS), mobile terminal (MT), user terminal (UT), subscriber station (SS), wireless device, personal digital assistant (PDA), wireless modem, handheld device, etc. In this disclosure, a BS refers to a fixed station that communicates with and exchanges data and control information with a UE and/or another BS. The term BS may be referred to as Advanced Base Station (ABS), Node B (NB), Evolved Node B (eNB), Base Transceiver System (BTS), Access Point (AP), Processing Server (PS), etc. Specifically, the BS of Universal Terrestrial Radio Access (UTRAN) is called NB, the BS of Evolved UTRAN (E-UTRAN) is called eNB, and the BS of the new radio access technology network is called gNB. Hereinafter, for convenience of description, NB, eNB or gNB will be referred to as BS regardless of the type or version of communication technology.

In this disclosure, a node refers to a fixed point capable of transmitting/receiving radio signals to/from the UE by communicating with the UE. Regardless of their names, various types of BSs can be used as nodes. For example, a BS, NB, eNB, pico cell eNB (PeNB), home eNB (HeNB), relay, transponder, etc. may be nodes. In addition, the node may not be a BS. For example, a Radio Remote Head (RRH) or a Radio Remote Unit (RRU) may be a node. Generally, the RRH and RRU have a lower power level than that of the BS. Since the RRH or RRU (hereinafter, RRH/RRU) is usually connected to the BS through a dedicated line such as an optical cable, cooperative communication according to the RRH/RRU and the BS can be smooth compared with cooperative communication according to the BS connected through a wireless link executed. Install at least one antenna per node. An antenna may refer to a physical antenna port or to a virtual antenna or antenna group. Nodes can also be called points.

In this disclosure, a cell refers to a specific geographic area where one or more nodes provide communication services. Therefore, in the present disclosure, communication with a specific cell may mean communication with a BS or node that provides communication services to the specific cell. The DL/UL signal of a specific cell refers to the DL/UL signal from/to the BS or node that provides communication services for the specific cell. A cell that provides UL/DL communication services to UEs is specifically called a serving cell. Furthermore, the channel state/quality of a specific cell refers to the channel state/quality of a channel or communication link generated between a BS or node that provides communication services to the specific cell and a UE. In a 3GPP-based communication system, the UE may use CRS transmitted on cell-specific reference signal (CRS) resources and/or on channel state information reference signal (CSI-RS) resources (allocated to a specific node by the antenna port of the specific node). ) to measure the DL channel status from a specific node.

The 3GPP-based communication system uses the concept of cells in order to manage radio resources and distinguish cells related to radio resources from cells in geographical areas.

A "cell" of a geographical area may be understood as the coverage area within which a node can provide services using a carrier, and a "cell" of radio resources is associated with a bandwidth (BW) which is the frequency range configured by the carrier. Since DL coverage (the range within which a node can send effective signals) and UL coverage (the range within which a node can receive effective signals from UEs) depend on the carrier carrying the signal, the coverage of a node can also be related to the radio resources used by the node. The "cell" coverage is associated. Thus, the term "cell" may be used to indicate sometimes the service coverage of a node, at other times the radio resources, or at other times the range within which a signal using the radio resources can reach with effective strength.

In the 3GPP communication standard, the concept of a cell is used in order to manage radio resources. A "cell" associated with a radio resource is defined by a combination of DL resources and UL resources (ie, a combination of DL component carriers (CCs) and UL CCs). A cell may be configured by DL resources only, or by a combination of DL resources and UL resources. If carrier aggregation is supported, the link between the carrier frequency of the DL resource (or DL CC) and the carrier frequency of the UL resource (or UL CC) may be indicated by system information. For example, the combination of DL resources and UL resources may be indicated by a System Information Block Type 2 (SIB2) link. In this case, the carrier frequency may be equal to or different from the center frequency of each cell or CC. When carrier aggregation (CA) is configured, the UE has only one radio resource control (RRC) connection with the network. During RRC connection establishment/re-establishment/handover, a serving cell provides non-access plane (NAS) mobility information. During RRC connection re-establishment/handover, one serving cell provides security input. This cell is called the primary cell (Pcell). Pcell refers to a cell operating on the primary frequency where the UE performs the initial connection establishment process or initiates the connection re-establishment process. According to the UE capabilities, the secondary cell (Scell) may be configured to form a set of serving cells together with the Pcell. Scell may be configured after the RRC connection establishment is completed and used to provide additional radio resources in addition to the resources of a specific cell (SpCell). The carrier corresponding to the Pcell on the DL is called the downlink primary CC (DL PCC), and the carrier corresponding to the Pcell on the UL is called the uplink primary CC (UL PCC). The carrier corresponding to the Scell on the DL is called the downlink secondary CC (DLSCC), and the carrier corresponding to the Scell on the UL is called the uplink secondary CC (UL SCC).

In dual connectivity (DC) operation, the term special cell (SpCell) refers to the Pcell of the primary cell group (MCG) or the Pcell of the primary and secondary cell group (PSCell). SpCell supports PUCCH transmission and contention-based random access and is always enabled. The MCG is a set of serving cells associated with a master node (eg, BS) and includes a SpCell (Pcell) and optionally one or more Scells. For a UE configured with a DC, the SCG is a subset of the serving cell associated with the secondary node, and includes the PSCell and 0 or more Scells. PSCell is the main Scell of SCG. For a UE in the RRC_CONNECTED state without a CA or DC configured, there is only one serving cell including only Pcell. For a UE in the RRC_CONNECTED state and configured with CA or DC, the term serving cell refers to the set of cells including SpCell and all Scells. In the DC, two medium access control (MAC) entities are configured for the UE, namely, one MAC entity for MCG and one MAC entity for SCG.

For a UE configured with CA but not configured with DC, a Pcell PUCCH group including Pcell and 0 or more Scells (also called a primary PUCCH group) and an Scell PUCCH group including only Scells (also called a secondary PUCCH group) can be configured. For Scell, the Scell on which the PUCCH associated with the corresponding cell is transmitted (hereinafter, PUCCH cell) may be configured. The Scell indicating the PUCCH Scell belongs to the Scell PUCCH group (ie, the secondary PUCCH group), and PUCCH transmission of relevant uplink control information (UCI) is performed on the PUCCH Scell. If no PUCCH Scell is indicated for Scell or the cell indicated for PUCCH transmission of Scell is Pcell, Scell belongs to the Pcell PUCCH group (ie, the primary PUCCH group) and PUCCH transmission of the relevant UCI is performed on Pcell. In the following, if the UE is configured with an SCG and some implementations related to the PUCCH of the present disclosure are applied to the SCG, the primary cell may refer to the PSCell of the SCG. If the UE is configured with a PUCC HS cell and some PUCCH-related implementations of the present disclosure are applied to the secondary PUCCH group, the primary cell may refer to the PUCCH Scell of the secondary PUCCH group.

In a wireless communication system, a UE receives information from a BS on the DL, and the UE sends information to the BS on the UL. The information sent and/or received by the BS and UE includes data and various control information, and there are various physical channels according to the type/purpose of the information sent and/or received by the UE and BS.

3GPP-based communication standards define DL physical channels corresponding to resource elements carrying information originating from higher layers and DL physical signals corresponding to resource elements used by the physical layer but not carrying information originating from higher layers. For example, Physical Downlink Shared Channel (PDSCH), Physical Broadcast Channel (PBCH), Physical Multicast Channel (PMCH), Physical Control Format Indicator Channel (PCFICH), Physical Downlink Control Channel (PDCCH), etc. are defined as DL physical channel, and the reference signal (RS) and synchronization signal (SS) are defined as DL physical signals. RS (also called pilot) represents a signal with a predefined special waveform known to both the BS and the UE. For example, demodulation reference signal (DMRS), channel state information RS (CSI-RS), etc. are defined as DL RS. 3GPP-based communication standards define UL physical channels corresponding to resource elements carrying information originating from higher layers and UL physical signals corresponding to resource elements used by the physical layer but not carrying information originating from higher layers. For example, Physical Uplink Shared Channel (PUSCH), Physical Uplink Control Channel (PUCCH), and Physical Random Access Channel (PRACH) are defined as UL physical channels, and DMRS, used for UL control/data signals are defined. Sounding reference signal (SRS) for UL channel measurement, etc.

In the present disclosure, PDCCH refers to a set of time-frequency resources (eg, resource elements (REs)) that carry downlink control information (DCI), and PDSCH refers to a set of time-frequency resources that carry DL data. PUCCH, PUSCH and PRACH respectively refer to the set of time-frequency resources carrying UCI, the set of time-frequency resources carrying UL data and the set of time-frequency resources carrying random access signals. In the following description, "UE transmits/receives PUCCH/PUSCH/PRACH" is used as the same meaning, that is, the UE transmits/receives UCI/UL data/random access on or through PUCCH/PUSCH/PRACH, respectively. input signal. In addition, "BS transmits/receives PBCH/PDCCH/PDSCH" is used as the same meaning, that is, the BS transmits broadcast information/DCI/DL data on or through PBCH/PDCCH/PDSCH, respectively.

In the present disclosure, radio resources (eg, time-frequency resources) scheduled or configured by the BS for the UE to transmit or receive PUCCH/PUSCH/PDSCH may be referred to as PUCCH/PUSCH/PDSCH resources.

Since the communication device receives synchronization signal blocks (SSB), DMRS, CSI-RS, PBCH, PDCCH, PDSCH, PUSCH and/or PUCCH in the form of radio signals on the cell, the communication device may not select through a radio frequency (RF) receiver and receiving radio signals that include only specific physical channels or specific physical signals, or may not select and receive radio signals without specific physical channels or specific physical signals by the RF receiver. In actual operation, the communication device receives radio signals on the cell via an RF receiver, converts the radio signals as RF band signals into baseband signals, and then uses one or more processors to process physical signals in the baseband signals and/or Physical channel is decoded. Accordingly, in some implementations of the present disclosure, receiving a physical signal and/or a physical channel may mean that the communication device makes no attempt to recover the physical signal and/or the physical channel from the radio signal, e.g., makes no attempt to recover the physical signal and/or the physical channel. The decoding is performed without the non-communication device actually receiving the radio signal including the corresponding physical signal and/or physical channel.

As more and more communication devices require greater communication capacity, there is a need for eMBB communication relative to traditional radio access technology (RAT). In addition, large-scale MTC that provides various services anytime and anywhere by connecting multiple devices and objects to each other is a major issue to be considered in next-generation communications. In addition, communication system designs taking into account reliability- and delay-sensitive services/UEs are also being discussed. The introduction of next-generation RAT is being discussed considering eMBB communication, large-scale MTC, ultra-reliable low-latency communication (URLLC), etc. Currently, in 3GPP, research on the next generation mobile communication system after EPC is ongoing. In this disclosure, for convenience, the corresponding technology is called a new RAT (NR) or a fifth-generation (5G) RAT, and a system using NR or supporting NR is called an NR system.

Figure 1 shows an example of a communication system 1 to which implementations of the present disclosure are applied. Referring to FIG. 1 , a communication system 1 applied to the present disclosure includes a wireless device, a BS, and a network. Here, the wireless device means a device that performs communication using RAT (eg, 5G NR or LTE (eg, E-UTRA)), and may be called a communication/radio/5G device. Wireless devices may include, but are not limited to, robot 100a, vehicles 100b-1 and 100b-2, extended reality (XR) device 100c, handheld device 100d, home appliance 100e, Internet of Things (IoT) device 100f, and artificial intelligence (AI) Device/Server 400. For example, vehicles may include vehicles with wireless communication capabilities, autonomous vehicles, and vehicles capable of performing vehicle-to-vehicle communications. Here, the vehicle may include an unmanned aerial vehicle (UAV) (eg, a drone). XR devices may include augmented reality (AR)/virtual reality (VR)/mixed reality (MR) devices, and may include head-mounted devices (HMDs), head-up displays (HUDs) installed in vehicles, televisions, smartphones, Implemented in the form of computers, wearable devices, home appliances, digital signage, vehicles, robots, and more. Handheld devices may include smartphones, smart tablets, wearable devices (eg, smart watches or smart glasses), and computers (eg, notebooks). Home appliances may include TVs, refrigerators and washing machines. IoT devices can include sensors and smart meters. For example, the BS and network may also be implemented as wireless devices, and a particular wireless device may operate as a BS/network node relative to another wireless device.

Wireless devices 100a to 100f may connect to network 300 via BS 200. AI technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI server 400 via the network 300. Network 300 may be configured using a 3G network, a 4G (eg, LTE) network, or a 5G (eg, NR) network. Although the wireless devices 100a to 100f may communicate with each other through the BS 200/network 300, the wireless devices 100a to 100f may perform direct communication (eg, side link communication) with each other without passing through the BS/network. For example, vehicles 100b-1 and 100b-2 may perform direct communication (eg, vehicle-to-vehicle (V2V)/vehicle-to-everything (V2X) communication). IoT devices (eg, sensors) may perform direct communication with other IoT devices (eg, sensors) or other wireless devices 100a to 100f.

Wireless communications/connections 150a and 150b may be established between wireless devices 100a-100f and BS 200, and between wireless devices 100a-100f. Here, wireless communication/connections such as UL/DL communication 150a and sidelink communication 150b (or device-to-device (D2D) communication) may be established through various RATs (eg, 5G NR). The wireless device and the BS/wireless device may send/receive radio signals to/from each other through wireless communication/connections 150a and 150b. To this end, at least part of various configuration information configuration processes for transmitting/receiving radio signals, various signal processing processes (eg, channel encoding/decoding, modulation/demodulation, and resource mapping/demapping), and resource allocation processes may Various proposals based on this disclosure were performed.

Figure 2 is a block diagram illustrating an example of a communication device capable of performing a method according to the present disclosure. Referring to FIG. 2, the first wireless device 100 and the second wireless device 200 may transmit and/or receive radio signals through various RATs (eg, LTE and NR). Here, {first wireless device 100 and second wireless device 200} may correspond to {wireless device 100x and BS200} and/or {wireless device 100x and wireless device 100x} of FIG. 1 .

The first wireless device 100 may include one or more processors 102 and one or more memories 104, and additionally include one or more transceivers 106 and/or one or more antennas 108. The processor 102 may control the memory 104 and/or the transceiver 106 and may be configured to implement the functions, processes, and/or methods described/set forth below. For example, processor 102 may process information within memory 104 to generate a first information/signal and then transmit a radio signal including the first information/signal through transceiver 106 . The processor 102 may receive the radio signal including the second information/signal through the transceiver 106 and then store the information obtained by processing the second information/signal in the memory 104 . Memory 104 may be coupled to processor 102 and may store various information related to the operation of processor 102 . For example, memory 104 may execute some or all of the processes controlled by processor 102 or store software code including commands for performing the processes and/or methods described/proposed below. Here, the processor 102 and the memory 104 may be part of a communications modem/circuit/chip designed to implement RAT (eg, LTE or NR). Transceiver 106 may be connected to processor 102 and transmit and/or receive radio signals through one or more antennas 108 . Each transceiver 106 may include a transmitter and/or a receiver. Transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In this disclosure, a wireless device may represent a communications modem/circuit/chip.

The second wireless device 200 may include one or more processors 202 and one or more memories 204, and additionally include one or more transceivers 206 and/or one or more antennas 208. The processor 202 may control the memory 204 and/or the transceiver 206 and may be configured to implement the functions, processes, and/or methods described/set forth below. For example, processor 202 may process information within memory 204 to generate third information/signals and then transmit a radio signal including the third information/signals through transceiver 206 . The processor 202 may receive the radio signal including the fourth information/signal through the transceiver 206 and then store the information obtained by processing the fourth information/signal in the memory 204 . Memory 204 may be coupled to processor 202 and may store various information related to the operation of processor 202 . For example, memory 204 may execute some or all of the processes controlled by processor 202 or store software code including commands for performing the processes and/or methods described/proposed below. Here, the processor 202 and the memory 204 may be part of a communications modem/circuitry/chip designed to implement RAT (eg, LTE or NR). Transceiver 206 may be connected to processor 202 and transmit and/or receive radio signals through one or more antennas 208 . Each transceiver 206 may include a transmitter and/or a receiver. Transceiver 206 may be used interchangeably with the RF unit. In this disclosure, a wireless device may represent a communications modem/circuit/chip.

Wireless communication technologies implemented in the wireless devices 100 and 200 of the present disclosure may include narrowband IoT for low-power communication as well as LTE, NR, and 6G communication. For example, NB-IoT technology may be an example of low power wide area network (LPWAN) technology and may be implemented through (but not limited to) standards such as LTE Cat NB1 and/or LTE Cat NB2. Additionally or alternatively, the wireless communication technology implemented in the wireless devices XXX and YYY of the present disclosure may perform communication based on LTE-M technology. For example, LTE-M technology may be an example of LPWAN technology and may be called various names such as enhanced machine-type communications (eMTC). For example, LTE-M technology may be implemented through (but not limited to) at least one of various standards, such as: 1) LTECAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-bandwidth Restricted), 5) LTE-MTC, 6) LTE Machine Type Communications and/or 7) LTE M. Additionally or alternatively, considering low-power communication, wireless communication technologies implemented in the wireless devices XXX and YYY of the present disclosure may include (but are not limited to) at least one of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN). kind. For example, ZigBee technology can create a personal area network (PAN) related to small/low-power digital communications based on various standards such as IEEE 802.15.4, and can be called various names.

In the following, the hardware elements of wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by, but are not limited to, one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., such as physical (PHY) layer, medium access control (MAC) layer, radio link control (RLC) layer, packet data convergence Protocol (PDCP) layer, Radio Resource Control (RRC) layer and Service Data Adaptation Protocol (SDAP) layer functional layer). One or more processors 102 and 202 may generate one or more protocol data units (PDUs) and/or one or more service data in accordance with the functions, procedures, proposals, and/or methods disclosed in this disclosure Unit (SDU). One or more processors 102 and 202 may generate messages, control information, data, or information in accordance with the functions, procedures, proposals, and/or methods disclosed in this disclosure. One or more processors 102 and 202 may generate signals (eg, baseband signals) including PDUs, SDUs, messages, control information, data, or information in accordance with the functions, procedures, proposals, and/or methods disclosed in this disclosure. , and provide the generated signals to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive signals (eg, baseband signals) from one or more transceivers 106 and 206 and obtain PDUs in accordance with the functions, procedures, proposals, and/or methods disclosed in this disclosure , SDU, message, control message, data or information.

One or more processors 102 and 202 may be referred to as a controller, microcontroller, microprocessor or microcomputer. One or more processors 102 and 202 may be implemented in hardware, firmware, software, or a combination thereof. As examples, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLD) or one or more field programmable gate arrays (FPGA) may be included in one or more processors 102 and 202 . The functions, processes, proposals, and/or methods disclosed in this disclosure may be implemented using firmware or software, and the firmware or software may be configured to include modules, processes, or functions. Firmware or software configured to perform the functions, processes, proposals, and/or methods disclosed in this disclosure may be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204 to be driven by one or more processors 102 and 202. The functions, processes, proposals, and/or methods disclosed in this disclosure may be implemented in the form of code, commands, and/or sets of commands using firmware or software.

One or more memories 104 and 204 may be coupled to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, codes, commands and/or instructions. One or more memories 104 and 204 may consist of read only memory (ROM), random access memory (RAM), electrically erasable programmable read only memory (EPROM), flash memory, hard drive, register, cache memory, computer Readable storage media and/or combination configurations thereof. One or more memories 104 and 204 may be located internally and/or externally to one or more processors 102 and 202 . One or more memories 104 and 204 may be connected to one or more processors 102 and 202 through various technologies, such as wired or wireless connections.

One or more transceivers 106 and 206 may transmit user data, control information and/or radio signals/channels referenced in the methods and/or operational flow diagrams of this disclosure to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information and/or referenced in the functional flowcharts and/or operational flow diagrams disclosed in this disclosure from one or more other devices. or radio signal/channel. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and send and receive radio signals. For example, one or more processors 102 and 202 may perform control such that one or more transceivers 106 and 206 may send user data, control information, or radio signals to one or more other devices. One or more processors 102 and 202 may perform control such that one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208. One or more transceivers 106 and 206 may be configured to transmit and receive via one or more antennas 108 and 208 the functions, procedures, proposals, methods and/or operational flowcharts disclosed in this disclosure. User data, control information and/or radio signals/channels. In this disclosure, one or more antennas may be multiple physical antennas or multiple logical antennas (eg, antenna ports). One or more transceivers 106 and 206 may convert received radio signals/channels, etc. from RF band signals to baseband signals for processing of received user data, control information using one or more processors 102 and 202 , radio signals/channels, etc. One or more transceivers 106 and 206 may convert user data, control information, radio signals/channels, etc. processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more transceivers 106 and 206 may include (analog) oscillators and/or filters.

Figure 3 illustrates another example of a wireless device capable of performing implementations of the present disclosure. Referring to FIG. 3, wireless devices 100 and 200 may correspond to the wireless devices 100 and 200 of FIG. 2, and may be configured from various elements, components, units/portions, and/or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and an additional component 140. The communication unit may include communication circuitry 112 and transceiver 114. For example, communications circuitry 112 may include one or more processors 102 and 202 and/or one or more memories 104 and 204 of FIG. 2 . For example, transceiver 114 may include one or more transceivers 106 and 206 and/or one or more antennas 108 and 208 of FIG. 2 . The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the add-on component 140, and controls the overall operation of the wireless device. For example, the control unit 120 may control the electrical/mechanical operation of the wireless device based on programs/codes/commands/information stored in the memory unit 130 . The control unit 120 may transmit the information stored in the memory unit 130 to the outside (for example, other communication devices) via the communication unit 110 through the wireless/wired interface, or transmit the information stored in the memory unit 130 to the outside (for example, other communication devices) via the communication unit 110 through the wireless/wired interface. The information received by the communication device is stored in the memory unit 130.

Add-on components 140 may be configured differently depending on the type of wireless device. For example, the add-on component 140 may include at least one of a power supply unit/battery, an input/output (I/O) unit, a drive unit, and a computing unit. The wireless device may be (but not limited to) robots (100a in Figure 1), vehicles (100b-1 and 100b-2 in Figure 1), XR devices (100c in Figure 1), handheld devices (100d in Figure 1), home Electrical appliances (100e in Figure 1), IoT devices (100f in Figure 1), digital broadcast UE, holographic devices, public safety devices, MTC devices, medical devices, financial technology devices (or financial devices), security devices, climate/environmental devices , AI server/device (400 in Figure 1), BS (200 in Figure 1), network nodes, etc. are implemented. Wireless devices can be used in mobile or fixed locations depending on usage/service.

In FIG. 3 , the various elements, components, units/portions and/or modules in the wireless devices 100 and 200 may all be connected to each other through wired interfaces, or at least part thereof may be connected wirelessly through the communication unit 110 . For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be wired, and the control unit 120 and the first units (eg, 130 and 140) may be wirelessly connected through the communication unit 110. Each element, component, unit/portion, and/or module within wireless devices 100 and 200 may also include one or more elements. For example, control unit 120 may be configured by a collection of one or more processors. As an example, the control unit 120 may be configured by a collection of communications control processors, applications processors, electronic control units (ECUs), graphics processing units, and memory control processors. As another example, memory 130 may be configured from random access memory (RAM), dynamic RAM (DRAM), read-only memory (ROM), flash memory, volatile memory, non-volatile memory, and/or combinations thereof.

In the present disclosure, at least one memory (eg, 104 or 204) may store instructions or programs that, when executed, may cause at least one processor operatively connected to the at least one memory to operate in accordance with the present disclosure. Some implementations or implementations of .

In the present disclosure, a computer-readable (non-transitory) storage medium may store at least one instruction or program, and the at least one instruction or program, when executed by at least one processor, may cause the at least one processor to operate according to the present disclosure. Some implementations or implementations of .

In the present disclosure, a processing apparatus or apparatus may include at least one processor and at least one computer memory operatively connected to the at least one processor. The at least one computer memory may store instructions or programs that, when executed, may cause at least one processor operatively connected to the at least one memory to perform operations in accordance with some embodiments or implementations of the present disclosure.

In the present disclosure, a computer program may include program code stored on at least one computer-readable (non-volatile) storage medium and which, when executed, is configured to perform operations or cause at least A processor performs operations in accordance with some implementations of the present disclosure. The computer program may be provided in the form of a computer program product. A computer program product may include at least one computer-readable (non-volatile) storage medium.

The communication device of the present disclosure includes: at least one processor; and at least one computer memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one process The processor performs operations according to examples of the present disclosure described later.

FIG. 4 shows an example of a frame structure used in a 3GPP-based wireless communication system.

The frame structure of Figure 4 is only exemplary, and the number of subframes, the number of time slots, and the number of symbols in the frame may be varied differently. In NR systems, different sets of OFDM parameters (eg, subcarrier spacing (SCS)) may be configured for multiple cells aggregated for one UE. Therefore, the (absolute time) duration of time resources including the same number of symbols (eg, subframes, time slots or transmission time intervals (TTIs)) may be configured differently for aggregated cells. Here, the symbols may include OFDM symbols (or cyclic prefix-OFDM (CP-OFDM) symbols) and SC-FDMA symbols (or discrete Fourier transform-spread-OFDM (DFT-s-OFDM) symbols). In this disclosure, symbols, OFDM-based symbols, OFDM symbols, CP-OFDM symbols and DFT-s-OFDM symbols may be used interchangeably.

Referring to FIG. 4, in the NR system, UL transmission and DL transmission are organized into frames. Each frame has a duration of T _f =(Δf _max *N _f /100)*T _c =10 ms and is divided into two half-frames of 5 ms each. The basic time unit of NR is T _c =1/(Δf _max *N _f ), where Δf _max =480*10 ³ Hz and N _f =4096. For reference, the basic time unit of LTE is T _s =1/(Δf _ref *N _f,ref ), where Δf _ref =15*10 ₃ Hz and N _f,ref =2048. T _c and T _f have the relationship of constant κ=T _c /T _f =64. Each half-frame includes 5 subframes, and the duration T _sf of a single subframe is 1 ms. Subframes are further divided into slots, and the number of slots in a subframe depends on the subcarrier spacing. Each slot consists of 14 or 12 OFDM symbols based on the cyclic prefix. In normal CP, each slot includes 14 OFDM symbols, and in extended CP, each slot includes 12 OFDM symbols. The parameter set depends on the exponentially scalable subcarrier spacing Δf = 2 ^u * 15kHz. The following table shows the number of OFDM symbols per slot (N ^slot _symb ), the number of slots per frame (N ^{frame, u} _slot ), and the number of slots per subframe (N ^{subframe, u} _slot ).

[Table 1]

u N ^slot _symb N ^{frame, u} _slot N ^subframe,u _slot 0 14 10 1 1 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16

The following table shows the number of OFDM symbols per slot, the number of slots per frame and the number of slots per subframe according to the subcarrier spacing Δf = 2 ^u *15 kHz.

[Table 2]

u N ^slot _symb N ^{frame, u} _slot N ^subframe,u _slot 2 12 40 4

For a subcarrier spacing configuration u, slots can be indexed in ascending order within a subframe as follows: n ^u _s ∈ {0,..., n ^{subframe , u} _slot -1}, and in ascending order within a frame as follows: n ^u _{s, f} ∈ {0,..., n ^{frame, u} _slot -1}.

Figure 5 shows a resource grid for time slots. A time slot includes multiple (eg, 14 or 12) symbols in the time domain. For each parameter set (eg, subcarrier spacing) and carrier, N ^size,u _grid,x is defined starting from the common resource block (CRB) N ^start,u _grid indicated by higher layer signaling (eg, RRC signaling) *N ^RB _sc subcarriers and N ^{subframe, u} _symb resource grid of OFDM symbols, where N ^{size, u} _{grid, x} is the number of resource blocks (RBs) in the resource grid, and for downlink, subscript x is DL, or UL for uplink. N ^RB _sc is the number of subcarriers per RB. In wireless communication systems based on 3GPP, N ^RB _sc is usually 12. For a given antenna port p, subcarrier spacing configuration u and transmission link (DL or UL), there exists a resource grid. The UE is given the carrier bandwidth N ^{size, u} _grid of the subcarrier spacing configuration u through higher layer parameters (eg, RRC parameters). Each element in the resource grid for antenna port p and subcarrier spacing configuration u is called a resource element (RE), and one complex symbol can be mapped to each RE. Each RE in the resource grid is uniquely identified by an index k in the frequency domain and an index l representing the symbol position relative to a reference point in the time domain. In NR systems, RBs are defined by 12 consecutive subcarriers in the frequency domain. In the NR system, RBs are classified into CRBs and physical resource blocks (PRBs). For subcarrier spacing configuration u, CRBs are numbered from 0 upwards in the frequency domain. The center of subcarrier 0 of CRB 0 of subcarrier spacing configuration u is equal to "point A" used as a common reference point for the RB grid. The PRBs of subcarrier spacing configuration u are defined within the bandwidth part (BWP) and are numbered from 0 to N ^size,u _BWP,i -1, where i is the number of BWPs. The relationship between PRB n _PRB and CRB n ^u _CRB in BWP i is given by n ^u _PRB =n ^u _CRB +N ^size,u _BWP, i, where N ^size _BWP,i is the CRB starting from BWP relative to CRB 0 . BWP includes multiple consecutive RBs in the frequency domain. For example, a BWP may be a subset of contiguous CRBs defined for a given parameter set _ui in BWP i on a given carrier. A carrier may include up to N (eg, 5) BWPs. A UE may be configured with one or more BWPs on a given component carrier. Data communication is performed through the enabled BWPs, and only a predetermined number of BWPs (eg, one BWP) among the BWPs configured for the UE on the component carrier may be active.

For each serving cell in a set of DL BWPs or UL BWPs, the network may configure at least an initial DL BWP and one (if the serving cell is configured with an uplink) or two (if supplementary uplinks are used) initial UL BWPs. The network can be configured with additional UL and DL BWPs. For each DL BWP or UL BWP, the following parameters may be provided to the UE for the serving cell: i) SCS; ii) CP; iii) indicated by offset RB _set and length L _RB as resource indication under the assumption of N ^start _{BWP =} 275 CRB N ^start _BWP = O _carrier + RB _start and the number of adjacent RBs N ^size _BWP = L _RB provided by the RRC parameter locationAndBandwidth of the symbol value (RIV), and the value O _carrier provided by the RRC parameter offsetToCarrier for SCS; DL BWP or UL An index into a collection of BWP; a collection of BWP public parameters; and a collection of BWP-specific parameters.

Virtual Resource Blocks (VRBs) can be defined within a BWP and are indexed from 0 to N ^size,u _BWP,i -1, where i represents the BWP number. VRBs can be mapped to PRBs according to non-interleaved mapping. In some implementations, for non-interleaved VRB to PRB mapping, VRBn may be mapped to PRBn.

A UE configured with carrier aggregation may be configured to use one or more cells. If the UE is configured with multiple serving cells, the UE may be configured with one or more cell groups. A UE may also be configured with multiple cell groups associated with different BSs. Alternatively, a UE may be configured with multiple cell groups associated with a single BS. Each cell group of a UE includes one or more serving cells and includes a single PUCCH cell configured with PUCCH resources. The PUCCH cell may be a Pcell or an Scell configured as a PUCCH cell among the Scells of the corresponding cell group. Each serving cell of the UE belongs to one of the cell groups of the UE and does not belong to multiple cells.

The NR band is defined as two types of frequency ranges, namely, FR1 and FR2. FR2 is also known as millimeter wave (mmW). The table below shows the frequency range over which NR operates.

[table 3]

Frequency range designation Corresponding frequency range subcarrier spacing FR1 410MHz-7125MHz 15, 30, 60kHz FR2 24250MHz-52600MHz 60, 120, 240kHz

In the following, physical channels usable in the 3GPP-based wireless communication system will be described in detail.

PDCCH carries DCI. For example, the PDCCH (i.e., DCI) carries information about the transmission format and resource allocation of the downlink shared channel (DL-SCH), information about the resource allocation of the uplink shared channel (UL-SCH), information about the paging channel (PCH), system information on DL-SCH, control messages on a layer higher than the physical layer (hereinafter, higher layer) in the protocol stack of the UE/BS (for example, transmitted on the PDSCH Information on resource allocation of random access response (RAR), transmission power control command, information on activation/deactivation of configuration scheduling (CS), etc. The DCI including information on resource allocation of DL-SCH is called PDSCH scheduling DCI, and the DCI including information on resource allocation of UL-SCH is called PUSCH scheduling DCI. DCI includes a cyclic redundancy check (CRC). The CRC is masked/scrambled with various identifiers (eg Radio Network Temporary Identifier (RNTI)) depending on the owner and purpose of the PDCCH. For example, if the PDCCH is for a specific UE, the CRS is masked with the UE identifier (eg, Cell-RNTI (C-RNTI)). If the PDCCH is used for paging messages, the CRC is masked with the paging RNTI (P-RNTI). If the PDCCH is used for system information (eg, system information block (SIB)), the CRC is masked with the system information RNTI (SI-RNTI). If the PDCCH is used for random access response, the CRC is masked with random access-RNTI (RA-RNTI).

When the PDCCH on one serving cell schedules the PDSCH or PUSCH on another serving cell, it is called cross-carrier scheduling. Cross-carrier scheduling with a Carrier Indicator Field (CIF) may allow a PDCCH on a serving cell to schedule resources on another serving cell. When the PDSCH on the serving cell schedules the PDSCH or PUSCH on the serving cell, it is called self-carrier scheduling. When cross-carrier scheduling is used in a cell, the BS may provide information about the scheduling cell to the UE. For example, the BS may inform the UE whether the serving cell is scheduled by the PDCCH on another (scheduling) cell or by the serving cell. If the serving cell is scheduled by another (scheduling) cell, the BS may inform the UE which cell signals the DL assignment and UL grant of the serving cell. In this disclosure, a cell carrying PDCCH is called a scheduling cell, and a cell whose transmission of PUSCH or PDSCH is scheduled by DCI included in the PDCCH (ie, a cell carrying PUSCH or PDSCH scheduled by PDCCH) is called a scheduled cell. .

PDSCH is a physical layer UL channel used for UL data transmission. The PDSCH carries DL data (eg, DL-SCH transport blocks) and undergoes modulation such as Quadrature Phase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation (QAM), 64QAM, 256QAM, etc. Codewords are generated by encoding transport blocks (TB). PDSCH can carry up to two codewords. Scrambling and modulation mapping per codeword may be performed, and modulation symbols generated from individual codewords may be mapped to one or more layers. Each layer is mapped to a radio resource together with DMRS and generated as an OFDM symbol signal. Then, the OFDM symbol signal is transmitted through the corresponding antenna port.

PUCCH means the physical layer UL channel used for uplink control information (UCI) transmission. PUCCH carries UCI. The UCI types sent on the PUCCH may include Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) information, Scheduling Request (SR), and Channel State Information (CSI). The UCI bits may include HARQ-ACK information bits (if any), SR information bits (if any), Link Recovery Request (LRR) information bits (if any), and CSI bits (if any) . In the present disclosure, the HARQ-ACK information bits may correspond to the HARQ-ACK codebook. In particular, a bit sequence in which HARQ-ACK information bits are arranged according to predetermined rules is called a HARQ-ACK codebook.

- Scheduling Request (SR): Information used to request UL-SCH resources.

- Hybrid Automatic Repeat Request (HARQ) - Acknowledgment (ACK): Response to DL data packets (eg codewords) on the PDSCH. HARQ-ACK indicates whether the communication device successfully received the DL data packet. In response to a single codeword, a 1-bit HARQ-ACK may be sent. In response to the two codewords, a 2-bit HARQ-ACK may be sent. The HARQ-ACK response includes positive ACK (referred to as ACK), negative ACK (NACK), discontinuous transmission (DTX) or NACK/DTX. Here, the term HARQ-ACK may be used interchangeably with HARQ ACK/NACK, ACK/NACK or A/N.

-Channel State Information (CSI): feedback information about the DL channel. CSI may include channel quality information (CQI), rank indicator (RI), precoding matrix indicator (PMI), CSI-RS resource indicator (CRI), SS/PBCH resource block indicator (SSBRI), and layer indicator (L1). The CSI may be classified into CSI Part 1 and CSI Part 2 according to the UCI type included in the CSI. For example, the CRI, RI and/or CQI of the first codeword may be included in CSI part 1, and the LI, PMI and/or CQI of the second codeword may be included in CSI part 2.

-Link Recovery Request (LRR):

In this disclosure, for convenience, the PUCCH resources configured/indicated by the BS for/to the UE HARQ-ACK, SR and CSI transmission are respectively called HARQ-ACK PUCCH resources, SR PUCCH resources and CSIPUCCH resources.

Depending on the UCI payload size and/or transmission length (eg, number of symbols included in the PUCCH resource), the PUCCH format may be defined as follows. Regarding the PUCCH format, please also refer to Table 4.

(0)PUCCH format 0 (PF0 or F0)

-Supported UCI payload size: up to K bits (e.g., K=2)

- Number of OFDM symbols constituting a single PUCCH: 1 to X symbols (e.g., X=2)

-Transmission structure: PUCCH format 0 only includes UCI signals without DMRS. The UE sends UCI status by selecting and sending one of multiple sequences. For example, the UE sends a specific UCI to the BS by sending one of multiple sequences via PUCCH (PUCCH format 0). The UE only sends PUCCH (PUCCH format 0) in the PUCCH resources configured for the corresponding SR when sending a positive SR.

- The configuration of PUCCH format 0 includes the following parameters corresponding to the PUCCH resource: the index of the initial cyclic shift, the number of symbols used for PUCCH transmission and/or the first symbol used for PUCCH transmission.

(1)PUCCH format 1 (PF1 or F1)

-Supported UCI payload size: up to K bits (e.g., K=2)

- Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (for example, Y=4 and Z=14)

-Transmission structure: DMRS and UCI are configured in/mapped to different OFDM symbols according to TDM. In other words, DMRS is transmitted in symbols where no modulation symbols are transmitted, and UCI is expressed as the product between a specific sequence (eg, Orthogonal Cover Code (OCC)) and modulation (eg, QPSK) symbols. Code Division Multiplexing (CDM) is supported between multiple PUCCH resources (conforming to PUCCH format 1) (within the same RB) by applying cyclic shift (CS)/OCC to both UCI and DMRS. PUCCH format 1 carries UCI of up to 2 bits, and modulation symbols are spread by OCC (differently configured depending on whether frequency hopping is performed) in the time domain.

- The configuration of PUCCH format 1 includes the following parameters corresponding to the PUCCH resource: the index of the initial cyclic shift, the number of symbols used for PUCCH transmission, the first symbol used for PUCCH transmission and/or the index of the OCC.

(2)PUCCH format 2 (PF2 or F2)

-Supported UCI payload size: more than K bits (e.g., K=2)

- Number of OFDM symbols constituting a single PUCCH: 1 to X symbols (e.g., X=2)

-Transmission structure: DMRS and UCI are configured/mapped using Frequency Division Multiplexing (FDM) within the same symbol. The UE sends UCI by applying IFFT to the encoded UCI bits without DFT. PUCCH format 2 carries UCI with a larger bit size than K bits, and the modulation symbols undergo FDM with DMRS for transmission. For example, DMRS is located in symbol indices #1, #4, #7, and #10 within a given RB with a density of 1/3. Pseudo noise (PN) sequences are used for DMRS sequences. Frequency hopping can be enabled for 2-symbol PUCCH format 2.

- The configuration of PUCCH format 2 includes the following parameters corresponding to PUCCH resources: the number of PRBs, the number of symbols used for PUCCH transmission and/or the first symbol used for PUCCH transmission.

(3)PUCCH format 3 (PF3 or F3)

-Supported UCI payload size: more than K bits (e.g., K=2)

- Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (for example, Y=4 and Z=14)

-Transmission structure: DMRS and UCI are configured/mapped to different OFDM symbols by TDM. The UE transmits UCI by applying DFT to the encoded UCI bits. PUCCH format 3 does not support UE multiplexing for the same time-frequency resources (eg, the same PRB).

The configuration of PUCCH format 3 includes the following parameters corresponding to PUCCH resources: the number of PRBs, the number of symbols used for PUCCH transmission, and/or the first symbol used for PUCCH transmission.

(4)PUCCH format 4 (PF4 or F4)

-Supported UCI payload size: more than K bits (e.g., K=2)

- Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (for example, Y=4 and Z=14)

-Transmission structure: DMRS and UCI are configured/mapped to different OFDM symbols by TDM. PUCCH format 4 can multiplex up to 4 UEs in the same PRB by applying OCC in front of DFT and applying CS (or interleaved FDM (IFDM) mapping) to DMRS. In other words, the modulation symbols of UCI undergo TDM with DMRS for transmission.

- The configuration of PUCCH format 4 includes the following parameters corresponding to PUCCH resources: the number of symbols used for PUCCH transmission, the length of OCC, the index of OCC and the first symbol used for PUCCH transmission.

The following table shows the PUCCH format. According to the PUCCH transmission length, the PUCCH format can be divided into short PUCCH format (formats 0 and 2) and long PUCCH format (formats 1, 3 and 4).

[Table 4]

PUCCH resources may be determined according to UCI type (eg, A/N, SR, or CSI). PUCCH resources for UCI transmission may be determined based on UCI (payload) size. For example, the BS may configure multiple PUCCH resource sets for the UE, and the UE may select a specific PUCCH resource set corresponding to a specific range according to a range of UCI (payload) size (eg, number of UCI bits). For example, the UE may select one of the following PUCCH resource sets according to the UCI bit number NUCI.

-PUCCH resource set #0, if UCI bit number =<2

-PUCCH resource set #1, if 2<number of UCI bits=<N1

...

-PUCCH resource set #(K-1), if NK-2<number of UCI bits=<NK-1

Here, K represents the number of PUCCH resource sets (K>1), and Ni represents the maximum number of UCI bits supported by PUCCH resource set #i. For example, PUCCH resource set #1 may include resources of PUCCH formats 0 to 1, and other PUCCH resource sets may include resources of PUCCH formats 2 to 4 (see Table 4).

The configuration of each PUCCH resource includes a PUCCH resource index, a starting PRB index, and a configuration of one of PUCCH format 0 to PUCCH format 4. The BS configures the UE through the higher layer parameter maxCodeRate to configure the code rate for multiplexing HARQ-ACK, SR and CSI reports within PUCCH transmission using PUCCH format 2, PUCCH format 3 or PUCCH format 4. The higher layer parameter maxCodeRate is used to determine how UCI is fed back on PUCCH resources in PUCCH format 2, 3 or 4.

If the UCI type is SR and CSI, the UE may be configured with PUCCH resources in the PUCCH resource set to be used for UCI transmission through higher layer signaling (eg, RRC signaling). If the UCI type is HARQ-ACK for Semi-Persistent Scheduling (SPS) PDSCH, the UE may be configured with PUCCH resources in the PUCCH resource set to be used for UCI transmission through higher layer signaling (eg, RRC signaling). On the other hand, if the UCI type is HARQ-ACK for DCI-scheduled PDSCH, then the PUCCH resources to be used for UCI transmission may be set by the DCI-scheduled PUCCH resource.

In the case of DCI-based PUCCH resource scheduling, the BS may send DCI to the UE on the PDCCH and indicate the PUCCH resources in a specific PUCCH resource set to be used for UCI transmission through an ACK/NACK resource indicator (ARI) in the DCI. ARI may be used to indicate PUCCH resources for ACK/NACK transmission and is also called PUCCH Resource Indicator (PRI). Here, DCI may be used for PDSCH scheduling and UCI may include HARQ-ACK for PDSCH. The BS may configure the UE through (UE-specific) higher layer (eg, RRC) signaling a PUCCH resource set that includes a larger number of PUCCH resources than the states that can be represented by the ARI. The ARI may indicate a PUCCH resource subset of the PUCCH resource set, and which PUCCH resource in the indicated PUCCH resource subset is to be used may be determined according to an implicit rule based on transmission resource information about the PDCCH (eg, a starting CCE index of the PDCCH) Sure.

For UL-SCH data transmission, the UE should include UL resources available to the UE, and for DL-SCH data reception, the UE should include DL resources available to the UE. The BS assigns UL resources and DL resources to the UE through resource allocation. Resource allocation may include time domain resource allocation (TDRA) and frequency domain resource allocation (FDRA). In this disclosure, UL resource allocation is also called UL grant, and DL resource allocation is called DL assignment. UL grants are dynamically received by the UE on the PDCCH or in the RAR, or semi-persistently configured by the BS for the UE through RRC signaling. DL assignments are dynamically received by the UE on the PDCCH, or semi-persistently configured by the BS for the UE through RRC signaling.

On the UL, the BS may dynamically allocate UL resources to the UE through the PDCCH addressed to the Cell Radio Network Temporary Identifier (C-RNTI). The UE monitors the PDCCH to discover possible UL grants for UL transmission. The BS may use the configuration grant to allocate UL resources to the UE. Two types of configuration licenses are available, Type 1 and Type 2. In Type 1, the BS directly provides the configured UL grant (including periodicity) through RRC signaling. In Type 2, the BS may configure the periodicity of the RRC configured UL grant through RRC signaling and signal, enable or deactivate the configured UL grant through the PDCCH addressed to the Configuration Scheduling RNTI (CS-RNTI). For example, in Type 2, the PDCCH addressed to the CS-RNTI indicates that until deactivated, the corresponding UL grant may be implicitly reused according to the periodicity configured through RRC signaling.

On the DL, the BS can dynamically allocate DL resources to the UE through the PDCCH addressed to the C-RNTI. The UE monitors the PDCCH for possible DL grants. The BS may use SPS to allocate DL resources to UEs. The BS may configure the periodicity of the configured DL assignment through RRC signaling and signal, enable or deactivate the configured DL assignment through the PDCCH addressed to the CS-RNTI. For example, the PDCCH addressed to the CS-RNTI indicates that until deactivated, the corresponding DL assignment may be implicitly reused according to the periodicity configured through RRC signaling.

In the following, resource allocation through PDCCH and resource allocation through RRC will be described in more detail.

*Resource allocation via PDCCH: dynamic grant/assignment

PDCCH can be used to schedule DL transmission on PDSCH and UL transmission on PUSCH. The DCI on the PDCCH used to schedule DL transmissions may include DL resource assignments, which include at least the modulation and coding format (e.g., modulation and coding scheme (MCS) index IMCS) associated with the DL-SCH, resource allocation, and HARQ information . The DCI on the PDCCH used to schedule UL transmission may include a UL scheduling grant, which includes at least the modulation and coding format, resource allocation and HARQ information associated with the UL-SCH. HARQ information on DL-SCH or UL-SCH may include New Information Indicator (NDI), Transport Block Size (TBS), Redundancy Version (RV), and HARQ process ID (ie, HARQ process number). The size and purpose of DCI carried by a PDCCH vary according to the DCI format. For example, DCI format 0_0, DCI format 0_1 or DCI format 0_2 can be used to schedule PUSCH, and DCI format 1_0, DCI format 1_1 or DCI format 1_2 can be used to schedule PDSCH. Specifically, DCI format 0_2 and DCI format 1_2 may be used for scheduling with higher transmission reliability and lower transmission reliability and delay requirements than those guaranteed by DCI format 0_0, DCI format 0_1, DCI format 1_0, or DCI format 1_1. Delay request transmission. Some implementations of the present disclosure may be applied to UL data transmission based on DCL format 0_2. Some implementations of the present disclosure may be applied to DL data reception based on DCI format 1_2.

Figure 7 shows an example of PDSCH TDRA caused by PDCCH and an example of PUSCH TDRA caused by PDCCH.

The DCI carried by the PDCCH for scheduling the PDSCH or PUSCH includes a TDRA field. The TDRA field provides the value m of row index m+1 for the allocation table of PDSCH or PUSCH. The predefined default PDSCH time domain allocation is applied as the PDSCH allocation table, or the PDSCH TDRA table configured by the BS through the RRC signal pdsch-TimeDomainAllocationList is applied as the PDSCH allocation table. The predefined default PUSCH time domain allocation is applied as the PUSCH allocation table, or the PUSCH TDRA table configured by the BS through the RRC signal pushch-TimeDomainAllocationList is applied as the PUSCH allocation table. The PDSCH TDRA table to be applied and/or the PUSCH TDRA table to be applied may be determined according to fixed/predefined rules (eg, refer to 3GPPTS 38.214).

In the PDSCH time domain resource configuration, each index row defines the DL assignment with the PDSCH slot offset K ₀ , start and length indicator value SLIV (or the starting position of the PDSCH in the direct slot (e.g., starting symbol Index S) and allocation length (e.g., number of symbols L)) and PDSCH mapping type. In the PUSCH time domain resource configuration, each index line defines the UL grant and PUSCH slot offset K ₂ , the starting position of the PUSCH in the slot (for example, the starting symbol index S) and the allocation length (for example, the number of symbols L ) and PUSCH mapping type. K ₀ for PDSCH and K ₂ for PUSCH indicate the difference between the slot with the PDCCH and the slot with the PDSCH or PUSCH corresponding to the PDCCH. SLIV represents a joint indicator relative to the starting symbol S and the number of consecutive symbols L counted from the symbol S, relative to the beginning of the slot with PDSCH or PUSCH. The PDSCH/PUSCH mapping type has two mapping types: mapping type A and mapping type B. In PDSCH/PUSCH mapping type A, a demodulation reference signal (DMRS) is mapped to a PDSCH/PUSCH resource based on the start of a slot. Depending on other DMRS parameters, one or two symbols among the symbols of the PDSCH/PUSCH resources may be used as DMRS symbols. For example, in PDSCH/PUSCH mapping type A, the DMRS is located on the third symbol (symbol #2) or the fourth symbol (symbol #3) in the slot according to RRC signaling. In PDSCH/PUSCH mapping type B, DMRS is mapped based on the first OFDM symbol of the PDSCH/PUSCH resource. Depending on other DMRS parameters, one or two symbols from the first symbol of the PDSCH/PUSCH resource may be used as DMRS symbols. For example, in PDSCH/PUSCH mapping type B, the DMRS is located on the first symbol allocated for PDSCH/PUSCH. In this disclosure, the PDSCH/PUSCH mapping type may be called mapping type or DMRS mapping type. For example, in the present disclosure, PUSCH mapping type A may be called mapping type A or DMRS mapping type A, and PUSCH mapping type B may be called mapping type B or DMRS mapping type B.

The scheduling DCI includes an FDRA field that provides information on assignment of RBs for PDSCH or PUSCH. For example, the FDRA field provides information about the cell used for PDSCH or PUSCH transmission to the UE, information about the BWP used for PDSCH or PUSCH transmission, and/or information about the RB used for PDSCH or PUSCH transmission.

*Resource allocation through RRC

As mentioned above, there are two types of transfers without dynamic permissions: configuration permission type 1 and configuration permission type 2. In configuration grant type 1, the UL grant is provided by the RRC and stored as the configuration UL grant. In configuration grant type 2, the UL grant is provided by the PDCCH and is stored or cleared as a configuration UL grant based on L1 signaling indicating the configuration UL grant activation or deactivation. Type 1 and Type 2 can be configured by RRC per serving cell and per BWP. Multiple configurations can be valid on different serving cells at the same time.

When configuration grant type 1 is configured, the following parameters can be provided to the UE through RRC signaling:

-cs-RNTI, corresponding to the CS-RNTI used for retransmission;

-periodicity, corresponding to the periodicity of configuration permission type 1;

-timeDomainOffset, indicates the resource offset in the time domain relative to the system frame number (SFN) = 0;

-timeDomainAllocation value m, provides row index m+1 pointing to the allocation table, indicating the combination of starting symbol S, length L and PUSCH mapping type;

-frequencyDomainAllocation, provides frequency domain resource allocation; and

-mcsAndTBS, provides IMCS indicating modulation order, target code rate and transport block size.

When the configuration grant type 1 is configured for the serving cell through RRC, the UE stores the UL grant provided by the RRC as the configured UL grant of the indicated serving cell, and initializes or re-initializes the configuration UL grant to the configured UL grant according to timeDomainOffset and S (from SLIV derivation) begins with the symbol and repeats with periodicity. After configuring the UL grant for configuration grant type 1, the UE may consider the UL grant to be repeated associated with each symbol satisfying the following formula: [(SFN*numberOfSlotsPerFrame(numberOfSymbolsPerSlot)+(number of slots in the frame*numberOfSymbolsPerSlot)+in the slot Number of symbols]=(timeDomainOffset*numberOfSymbolsPerSlot+S+N*periodicity)modulo(1024*numberOfSlotsPerFrame*numberOfSymbolsPerSlot), for all N>=0, where numberOfSlotsPerFrame and numberOfSymbolsPerSlot respectively indicate the number of consecutive slots per frame and the number of times per slot The number of consecutive OFDM symbols (refer to Table 1 and Table 2).

For configuration grant type 2, the BS may provide the following parameters to the UE through RRC signaling:

-cs-RNTI, corresponding to the CS-RNTI used for activation, deactivation, and retransmission; and

-periodicity, provides periodicity for configuring license type 2.

The actual UL grant is provided to the UE via the PDCCH (addressed to CS-RNTI). After configuring the UL grant for configuration grant type 2, the UE may consider the UL grant to be repeated with each symbol that satisfies the following formula: [(SFN*numberOfSlotsPerFrame*numberOfSymbolsPerSlot) + (number of slots in the frame*numberOfSymbolsPerSlot) + in the slot Number of symbols]=[(SFN _{start time} *numberOfSlotsPerFrame*numberOfSymbolsPerSlot+slot _{start time} *numberOfSymbolsPerSlot+symbol _{start time} )+N*periodicity]modulo(1024*numberOfSlotsPerFrame*numberOfSymbolsPerSlot), for all N>=0, where SFN _{start time} , The slot _{start time} and symbol _{start time} respectively indicate the SFN, timeslot and symbol of the first transmission opportunity of PUSCH after the configuration permission can be (re)initialized. numberOfSlotsPerFrame and numberOfSymbolsPerSlot respectively indicate the number of consecutive slots per frame and per timeslot. The number of consecutive OFDM symbols (refer to Table 1 and Table 2).

In some scenarios, the BS may further provide the UE with the parameter harq-ProcID-Offset and/or the parameter harq-ProcID-Offset2 used to derive the HARQ process ID for configuring the UL grant. harq-ProcID-Offset is the offset of the HARQ process configured for shared spectrum channel access operation, and harq-ProcID-Offset2 is the offset of the HARQ process configured for permission. In the present disclosure, cg-RetransmissionTimer is a duration after a transmission (retransmission) based on a configuration grant, in which the UE should not perform retransmission autonomously based on the HARQ process of the transmission (retransmission). The cg-RetransmissionTimer may be provided to the UE by the BS when configuring retransmission regarding the configured UL grant. For configuration permissions where neither harq-ProcID-Offset nor cg-RetransmissionTimer is configured, the HARQ process ID associated with the first symbol of the UL transmission can be derived from: HARQ process ID = [floor(CURRENT_symbol/periodicity)]modulonrofHARQ -Processes. For a configured UL grant with harq-ProcID-Offset2, the HARQ process ID associated with the first symbol of the UL transmission can be derived from: HARQ process ID=[floor(CURRENT_symbol/periodicity)]modulo nrofHARQ-Processes+harq-ProcID -Offset2, where CURRENT_symbol=(SFN*numberOfSlotsPerFrame*numberOfSymbolsPerSlot+slot number in frame*numberOfSymbolsPerSlot+symbol number in slot), and numberOfSlotsPerFrame and numberOfSymbolsPerSlot respectively represent the number of consecutive time slots per frame and the number of consecutive OFDM symbols per time slot . For configured UL grant with cg-RetransmissionTimer, the UE may select a HARQ process ID from among the HARQ process IDs available for configured grant configuration.

On the DL, semi-persistent scheduling (SPS) can be provided to the UE through RRC signaling from the BS per serving cell and per BWP. For DL SPS, the DL assignment is provided to the UE through the PDCCH and is stored or cleared based on L1 signaling indicating SPS activation or deactivation. When configuring SPS, the BS may provide the following parameters to the UE through RRC signaling used to configure semi-persistent transmission (e.g., SPS configuration):

-cs-RNTI, corresponding to the CS-RNTI used for activation, deactivation and retransmission;

-nrofHARQ-Processes, provides the number of HARQ processes used for SPS;

-periodicity, provides the periodicity of configuration DL assignment for SPS;

-n1PUCCH-AN, provides HARQ resources for PUCCH of SPS (the network configures HARQ resources as format 0 or format 1, and the actual PUCCH resources are configured by PUCCH-config and referenced by their ID in n1PUCCH-AN).

Multiple DL SPS configurations can be configured within the BWP of the serving cell. After configuring the DL assignment for the SPS, the UE may sequentially consider that the Nth DL assignment occurs in a time slot that satisfies the following formula: (numberOfSlotsPerFrame*SFN+number of time slots in the frame)=[(numberOfSlotsPerFrame*SFN _{start time} +slot _{start time} )+N*periodicity*numberOfSlotsPerFrame/10]modulo(1024*numberOfSlotsPerFrame), where the SFN _{start time} and slot _{start time} respectively represent the SFN and slot of the first transmission of PDSCH after the configuration DL assignment is (re)initialized, numberOfSlotsPerFrame and numberOfSymbolsPerSlot respectively indicate the number of consecutive slots per frame and the number of consecutive OFDM symbols per slot (refer to Table 1 and Table 2).

In some scenarios, the BS may further provide the UE with a parameter harq-ProcID-Offset for deriving the HARQ process ID that configures the DL assignment. harq-ProcID-Offset is the offset of the HARQ process of SPS. For configured DL assignments without harq-ProcID-Offset, the HARQ process ID associated with the slot where the DL transmission starts can be determined from the following equation: HARQ process ID=[floor(CURRENT_slot*10/(numberOfSlotsPerFrame*periodicity))]modulo nrofHARQ-Processes, where CURRENT_slot=[(SFN*numberOfSlotsPerFrame)+slot number in frame], and numberOfSlotsPerFrame represents the number of consecutive slots in each frame. For configured DL assignments with harq-ProcID-Offset, the HARQ process ID associated with the slot where the DL transmission starts can be determined from: HARQ process ID = [floor(CURRENT_slot/periodicity)]modulo nrofHARQ-Processes+harq- ProcID-Offset, where CURRENT_slot=[(SFN*numberOfSlotsPerFrame)+slot number in frame], and numberOfSlotsPerFrame represents the number of consecutive slots in each frame.

If the CRC corresponding to the DCI format is scrambled with the CS-RNTI provided by the RRC parameter cs-RNTI and the new data indicator field of the enabled transport block is set to 0, the UE verifies the DL SPS assignment PDCCH for scheduling enablement or scheduling release Or configure UL grant type 2PDCCH. If all fields of the DCI format are set according to Table 5 and Table 6, verification of the DCI format is achieved. Table 5 shows an example of special fields for DL SPS and UL grant type 2 scheduling to enable PDCCH verification, and Table 6 shows an example of special fields for DL SPS and UL grant type 2 scheduling to release PDCCH verification.

[table 5]

[Table 6]

DCI format 0_0 DCI format 1_0 HARQ process number Set all to "0" Set all to "0" redundant version Set to "00" Set to "00" Modulation and coding scheme Set all to "1" Set all to "1" resource block assignment Set all to "1" Set all to "1"

The actual DL assignment and UL grant for DL SPS or UL grant type 2 and the corresponding MCS are scheduled by the corresponding DL SPS or UL grant type 2 to enable the resource assignment field in the DCI format carried by the PDCCH (e.g., providing the TDRA value m TDRA field, FDRA field that provides frequency resource block assignment and/or MCS field) are provided. If verification is implemented, the UE treats the information in the DCI format as a valid enablement or valid release of the DL SPS or configured UL grant type 2.

In the present disclosure, the DL SPS-based PDSCH may be called SPS PDSCH, and the UL Configuration Grant (CG)-based PUSCH may be called CG PUSCH. The PDSCH dynamically scheduled by the DCI carried on the PDCCH may be called a dynamic grant (DG) PDSCH, and the PUSCH dynamically scheduled by the DCI carried on the PDCCH may be called a DG PUSCH.

Figure 7 illustrates an example of multiplexing UCI with PUSCH. When PUCCH resources overlap with PUSCH resources in the slot and no simultaneous PUCCH-PUSCH transmission is configured, UCI can be sent over PUSCH as shown therein. The transmission of UCI on PUSCH is called UCI piggybacking or PUSCH piggybacking. In particular, Figure 7 illustrates the case where HARQ-ACK and CSI are carried on PUSCH resources.

The BS controls the time and frequency resources that the UE can use to report CSI. In 3GPP-based systems, CSI may consist of the following indicators/reports: Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), CSI-RS Resource Indicator (CRI), SS/PBCH Block Resource Indication symbol (SSBRI), layer indicator (LI), rank indicator (RI), layer 1 reference signal received power (L1-RSRP) or layer 1 signal to interference and noise ratio (L1-SINR).

For CQI, PMI, CRI, SSBRI, LI, RI, L1-RSRP, L1-SINR, the UE is configured through higher layer (eg, RRC) signaling with N>=1 CSI-ReportConfig report settings, M>=1 CSI-ResourceConfig resource settings and one or two trigger state lists (given by the higher layer parameters CSI-AperiodicTriggerStateList and CSI-SemiPersistentOnPUSCH-TriggerStateList). Each trigger state in the CSI-AperiodicTriggerStateList contains a list of associated CSI-ReportConfig indicating the resource set ID for the channel and optionally for interference. Each trigger state in the CSI-SemiPersistentOnPUSCH-TriggerStateList contains an associated CSI-ReportConfig.

Each report setting CSI-ReportConfig is associated with a single downlink BWP (indicated by the higher layer parameter BWP-Id provided by the BS) given in the associated CSI-ResourceConfig for channel measurements, and contains the Parameters: codebook configuration (including codebook subset restrictions), time domain behavior, frequency granularity for CQI and PMI, measurement restriction configuration and CSI related quantities to be reported by the UE (e.g. LI, L1-RSRP, L1- SINR, CRI and SSBRI).

There are three types of reports: periodic CSI (P-CSI) reports, semi-persistent CSI (SP-CSI) reports, and aperiodic CSI (A-CSI) reports. The UE performs CSI reporting based on the RRC configuration for CSI reporting by the BS. The reporting configuration for CSI can be aperiodic (using PUSCH), periodic (using PUCCH) or semi-persistent (using PUCCH and DCI activated PUSCH). The above time domain behavior is indicated by the higher layer parameter reportConfigType in the CSI-ReportConfig provided by the BS, which can be set as follows: "aperiodic", "semiPersistentOnPUCCH", "semiPersistentOnPUSCH" or "periodic".

The higher layer parameter reportQuantity in CSI-ReportConfig indicates the quantity of CSI related, L1-RSRP related or L1-SINR related to be reported.

Each CSI resource setting CSI-ResourceConfig contains the configuration of a list of S >= 1 CSI resource set (given by the higher layer parameter csi-RS-ResourceSetList), where the list consists of NZP CSI-RS resource set and SS/PBCH Consists of one or two references to a block set, or a list consisting of references to a CSI-IM resource set. Each CSI resource setting is located in a DL BWP identified by the higher layer parameter BWP-id, and all CSI resource settings linked to a CSI reporting setting have the same DL BWP. The time-domain behavior of CSI-RS resources within a CSI resource setting is indicated by the higher layer parameter resourceType, and can be set to aperiodic, periodic or semi-persistent. The following one or more CSI resource settings for channel and interference measurements are configured through higher layer signaling: CSI-IM resources for interference measurements, NZP CSI-RS resources for interference measurements, NZP for channel measurements CSI-RS resources.

In a wireless communication system, the BS configures RS resources (eg, CSI-RS resources, SSB resources, etc.) for CSI reporting to the UE. The UE performs measurements on the RS received on the configured RS resources based on the configuration or trigger of the BS, and performs CSI reporting periodically or aperiodically based on the measurement values.

Aperiodic CSI reporting carried on PUSCH supports wideband and sub-band frequency granularity. Aperiodic CSI reports carried on PUSCH support Type I, Type II and enhanced Type IICSI. Type I CSI feedback is supported for CSI reporting on PUSCH. Type I wideband and subband CSI are supported for CSI reporting on PUSCH. Type IICSI is supported for CSI reporting on PUSCH. For Type I, Type II and Enhanced Type II CSI feedback on PUSCH, the CSI report may include two parts. Part 1 has a fixed payload size and is used to identify the number of bits of information in Part 2. Send part 1 in its entirety before part 2.

>For Type I CSI feedback, Part 1 contains the RI (if reported), CRI (if reported), CQI (if reported) of the first codeword. Part 2 contains the PMI (if reported) and, if the RI (if reported) is greater than 4, the CQI of the second codeword (if reported).

>For type IICSI feedback, Part 1 contains the RI (if reported), CQI and an indication of the number of non-zero wideband amplitude coefficients per layer for type IICSI. The fields of Part 1 - RI (if reported), CQI and an indication of the number of non-zero wideband amplitude coefficients per layer - are coded separately. Part 2 contains PMI for Type I CSI. The elements of i _1,4,l , i _2,1,l (if reported) and i _2,2,l (reported) are reported in ascending order of their index, i=0,1,...,2L-1, Among them, the element with the lowest index maps to the most significant bit, and the element with the highest index maps to the least significant bit. Part 1 and Part 2 are coded separately.

>For enhanced type IICSI feedback, Part 1 contains an indication of the RI, CQI and total number of cross-layer non-zero amplitude coefficients for enhanced type IICSI. The fields of Part 1 - RI, CQI and an indication of the total number of non-zero amplitude coefficients across layers - are coded separately. Part 2 contains PMI of enhanced type IICSI. Part 1 and Part 2 are coded separately.

The UE may be semi-statically configured by higher layers to perform periodic CSI reporting on the PUCCH. The UE may be configured by a higher layer for a plurality of periodic CSI reports corresponding to a plurality of higher layer configured CSI report settings, wherein the associated CSI resource settings are configured by the higher layer. Periodic CSI reporting on PUCCH formats 2, 3, and 4 supports type ICSI with wideband granularity. Semi-persistent CSI reporting on PUCCH supports Type I CSI. Semi-persistent CSI reporting on PUCCH format 2 supports Type I CSI with wideband frequency granularity. Semi-persistent CSI reporting on PUCCH format 3 or 4 supports Type I CSI and Type II CSI Part 1 with wideband and subband frequency granularity. When PUCCH carries Type I CSI with wideband frequency granularity, the CSI payload carried by PUCCH format 2 and PUCCH format 3 or 4 is the same and is the same regardless of RI (if reported), CRI (if reported) . For Type I CSI subband reporting on PUCCH format 3 or 4, the payload is divided into two parts. The first part contains the RI (if reported), CRI (if reported), CQI for the first codeword. The second part contains the PMI and, when RI>4, the CQI for the second codeword.

The UE calculates the CSI parameters to be reported based on the configuration or triggering of the BS by assuming the following dependencies between CSI parameters:

- Calculate LI conditional on reported CQI, PMI, RI and CRI;

- Calculate CQI conditional on reported PMI, RI and CRI;

- Calculate PMI conditional on reported RI and CRI;

-Calculate RI conditional on reported CRI.

In order to perform CSI reporting configured or instructed to the UE, the UE needs to receive the RS for CSI reporting and perform CSI calculation based on the RS. Therefore, if the UE determines all CSI values to be included in the CSI report associated with a PUSCH or PUCCH transmission according to its CSI reporting configuration, and then performs the CSI reporting through the PUSCH or PUCCH transmission, a time delay including the CSI calculation time occurs there . However, long delays in CSI reporting mean that significant time is required to ensure the accuracy of CSI and MCS. This is not only not suitable for services such as URLLC that are delay-sensitive, difficult to predict traffic characteristics, and sporadic, but also does not apply to burst transmissions performed in a short period of time. The reason is that the accuracy of CSI and MCS is very important to enhance URLLC reliability. Therefore, there is a need for a method that can not only reduce the delay time experienced by the UE by reducing the processing time of the UE but also perform CSI reporting with high accuracy.

In some implementations, consideration may be given to reducing the amount of information that needs to be processed by sending only a portion of the CSI that is conventionally reported by the UE (eg, NRRel-16). In some implementations, the UE may perform partial CSI reporting under predetermined conditions, that is, the UE may only send partial CSI to the BS under predetermined conditions. However, if it is difficult for the BS to know whether the predetermined condition is satisfied at the UE, the BS may not be able to predict the total bit size of the UCI that the UE will transmit, and therefore, the BS may encounter difficulty in decoding the UCI received from the UE.

In the following, the present disclosure not only addresses problems that may arise when a UE transmits only a part of the CSI (eg, CQI) to reduce the CSI processing time required by the UE, but also provides solutions thereto. For example, this disclosure describes conditions under which a UE can transmit only partial CSI and some implementations in which the UE provides additional information required by the BS to successfully receive the CSI.

In the present disclosure, the partial CSI report may refer to an operation of only transmitting or updating at least some of the two or more pieces of CSI transmitted by the UE according to the regular CSI report. For example, partial CSI reporting may mean that the UE does not send wideband/subband CQI, RI and PMI in CSI, but only sends wideband/subband CQI. Alternatively, partial CSI reporting may mean that the UE performs CSI reporting by updating only the CQI but using the same value as previously sent for the remaining information. In some implementations, information omitted due to partial CSI reporting may not be derived because the UE does not perform the processing necessary to generate the information, or information omitted due to partial CSI reporting may not be derived after performing the processing required to derive the omitted information. Can be discarded from transmission. In some implementations of the present disclosure, if the information omitted due to partial CSI reporting is not derived by the UE but needs to be derived/generated other information that needs to be sent, the UE may be based on previously derived or transmitted information or recently derived or transmitted Export/generation of other information required for information execution. In some implementations of the present disclosure, the specific information on which the partial CSI report is based (eg, information used to derive values to be sent in the partial CSI report) may be limited to being associated with the same CSI configuration as that of the partial CSI report. Information. In other words, the UE may derive/generate the information required for the partial CSI report based on previously derived or transmitted information or recently derived or transmitted information under the same CSI configuration as that used for the partial CSI report.

In some scenarios (e.g., NR Rel-16), when the UE loads the UCI payload on the UL resources determined (for UL multiplexing) from the given PUCCH resources, since the determined UL resources can accommodate The amount of information is limited, so the UE cannot load the entire generated CSI on UL resources. In this case, the UE performs CSI omission to omit some of the generated CSI based on CSI part 1, based on CSI part 2, or if necessary, based on subbands for CSI part 2.

While CSI omission is intended to include as much information as possible in limited UL resources, partial CSI reporting according to some implementations of the present disclosure is intended to reduce processing time by reducing the information that the UE needs to generate. Therefore, unlike CSI omission in which some of the generated CSI is excluded from the UCI payload based on CSI part 1, based on CSI part 2, or based on subbands of CSI part 2, partial CSI according to some implementations of the present disclosure Omit the part that generates only the CQI/RI/PMI to be included in the CSI report. In the case of CSI omission, if conditions according to some implementations of the present disclosure are met, CSI configuration may be provided to the UE to enable the UE to generate only some values to be included in the CSI report. In addition, even at the moment of CSI reporting, the UE needs to be able to determine whether to semi-statically exclude part of the CSI before UCI multiplexing. Considering that the purpose of partial CSI reporting is to reduce the amount of information, and thereby reduce the processing time required for CSI generation, it is necessary to determine whether to perform partial CSI reporting before CSI generation. CSI reporting may be an example of a full CSI report because for CSI reporting, the UE generates the CSI values that the UE is configured/instructed to report.

UE side:

Figure 8 illustrates an operational flow of a UE according to some implementations of the present disclosure.

The UE may be configured with higher layer parameters required for CSI transmission. The UE may perform partial CSI reporting only when conditions according to some implementations of the present disclosure are met. In some implementations of the present disclosure, the following UE operations may be considered.

The UE may receive one or more RRC configurations for CSI transmission from the BS (S801). The RRC configuration can be received individually for each CSI configuration.

The UE may receive DCI sent by the BS (S803). The UE may send CSI on PUCCH/PUSCH resources indicated by DCI or determined based on configured PUCCH resources (through higher layer signaling from the BS). In this case, some implementations of the present disclosure may be used to select corresponding PUCCH resources.

In order to send CSI, the UE may also perform partial CSI reporting (S805) according to some implementations of the present disclosure. In other words, the UE can optionally update CQI, RI and PMI information. For example, to determine whether to perform partial CSI reporting, the UE may consider the time domain location of the last measurement resource to be used for CSI reporting.

The last measurement resource refers to the resource used by the UE for CSI reporting, which can be represented by CSI reference resources. In some implementations of the present disclosure, the measurement resources may be CSI-RS resources. For example, the measurement resources may be non-zero power (NZP) CSI-RS resources and/or CSI interference measurement (CSI-IM) resources, where the UE performs channel measurements and/or interference measurements to calculate CQI values. Alternatively, in some implementations of the present disclosure, the measurement resources may be CSI reference resources defined in Section 5.2.2.5 of 3GPP TS 38.214. For example, according to 3GPP TS 38.214 Rel-16, the CSI reference resources for the serving cell are defined as follows:

>In the frequency domain, the CSI reference resources are defined by the set of downlink physical resource blocks corresponding to the band associated with the derived CSI.

> In the time domain, the CSI reference resource used for CSI reporting in uplink slot n' is defined by a single downlink slot nn _{CSI_ref} ,

>>Where, n=floor{n'*(2^u _DL /2^u _UL )}+floor{(n ^CA _{slot,offset,UL} /2^u _offset,UL )-(n ^CA _{slot,offset, DL} /2^u _offset,DL )}, and u _DL and u _UL are the subcarrier spacing configurations for DL and UL respectively, and the ca-SlotOffset configured by higher layers for cells transmitting uplink and downlink Determine n ^CA _{slot, offset} and u _offset ,

>>Among them, for periodic and semi-persistent CSI reporting

>>> If a single CSI-RS/SSB resource is configured for channel measurement, n _{CSI_ref} is the minimum value greater than or equal to 4*2^u _DL such that it corresponds to a valid downlink slot, or

>>>If multiple CSI-RS/SSB resources are configured for channel measurement, n _{CSI_ref} is the minimum value greater than or equal to 5*2^u _DL such that it corresponds to a valid downlink slot.

>>where, for aperiodic CSI reporting, if the UE is instructed by DCI to report CSI in the same slot as the CSI request, then n _{CSI_ref} is such that the reference resource is in the same valid downlink slot as the corresponding CSI request, Otherwise n _{CSI_ref} is the minimum value greater than or equal to floor(Z'/N ^slot _symb ) such that slot nn _{CSI_ref} corresponds to a valid downlink slot, where Z' corresponds to the delay requirement (see Table 7 or Table 8 ).

>>When periodic or semi-persistent CSI-RS/CSI-IM or SSB is used for channel/interference measurements, the UE is not expected to measure channel/interference on CSI-RS/CSI-IM/SSB during aperiodic CSI reporting The last OFDM symbol of CSI-RS/CSI-IM/SSB is received up to Z' symbols before the transmission time of the first OFDM symbol.

Table 7 shows the CSI calculation delay requirement 1, and Table 8 shows the CSI calculation delay requirement 2. For example, according to 3GPP TS38.214Rel-16, Z, Z' and u are defined as Z=max _m=0,...,M-1 (Z(m)) and Z'=max _{m=0,... .,M-1} (Z'(m)), where M is the number of updated CSI reports, (Z(m), Z'(m)) corresponds to the mth updated CSI report and is based on the predefined The condition is defined as (Z ₁ , Z ₁ ') of Table 7, (Z ₁ , Z ₁ ') of Table 8, (Z ₃ , Z ₃ ') of Table 8 or (Z ₂ , Z2') of Table 8 .

Table 7

Table 8

u of Tables 7 and 8 corresponds to min(u _PDCCH , u _CSI-RS , u _UL ), where u _PDCCH corresponds to the subcarrier spacing of the PDCCH using which to transmit DCI, and u _UL corresponds to using which to transmit The subcarrier spacing of PUSCH for CSI reporting, and u _CSI-RS corresponds to the minimum subcarrier spacing of aperiodic CSI-RS triggered by DCI. In Table 8, X _u is based on the UE reported capability beamReportTiming, and KB ₁ is based on the UE reported capability beamSwitchTiming (see 3GPP TS 38.306).

A timeslot in the serving cell may be considered a valid downlink if it includes at least one downlink or flexible symbol configured by a higher layer and it does not fall within the measurement gap configured for that UE road time slot. If there is no valid downlink slot for the CSI reference resource corresponding to the CSI report setting in the serving cell, the CSI report is omitted for the serving cell in the uplink slot n'.

After CSI reporting (re)configuration, serving cell activation, BWP change or SP-CSI activation, the UE only receives at least one CSI-RS transmission opportunity for channel measurement no later than the CSI reference resource and for interference. The CSI report is reported after the measured CSI-RS and/or CSI-IM timing, otherwise the report is discarded.

For example, the UE derives for each CQI value reported in uplink slot n the highest CQI index that satisfies the following conditions: It is capable of receiving modulation scheme with the corresponding CQI index, target code rate, and A combination of transport block sizes and occupies a single PDSCH transport block of a set of downlink physical resource blocks called CSI reference resources. According to the higher layer parameter values provided by the BS: the UE derives the channel used to calculate the CSI value reported in uplink slot n based only on the NZP CSI-RS associated with the CSI resource setting and no later than the CSI reference resource Measurement; The UE derives channel measurements for calculating the CSI reported in uplink slot n based only on the timing of the most recent NZP CSI-RS associated with the CSI resource setting, no later than the CSI reference resource; UE The interference measurements used to calculate the CSI values reported in uplink slot n are derived based only on the CSI-IM and/or NZP CSI-RS of the interference measurements associated with the CSI resource settings no later than the CSI reference resource; or , the UE derives the timing for CSI-IM and/or NZP CSI-RS based on the latest, no later than CSI reference resources, for interference measurement related to CSI resource settings (defined in [4, TS 38.211]). Compute the interference measurement for the CSI value reported in uplink slot n.

In some implementations, if configured to report the CQI index, in the CSI reference resource, the UE assumes some conditions for deriving the CQI index, and if also configured to report PMI and RI, the UE assumes for deriving the PMI and Some conditions for RI. For example, the UE assumes the following parts: the first 2 OFDM symbols are occupied by control signaling; the number of PDSCH and DM-RS symbols is equal to 12; the same bandwidth part subcarrier spacing configured for PDSCH reception; the bandwidth configured for the corresponding CQI report; The reference resource uses the CP length and subcarrier spacing configured for PDSCH reception; no resource elements are used for the primary synchronization signal or secondary synchronization signal or PBCH; redundancy version 0, etc.

In some scenarios, the CSI report is triggered by RRC and/or DCI, and the CSI report is related to the CSI report configuration. The CSI report configuration indicates PUCCH resources and CSI-RS resource configuration to be used for CSI reporting, and the UE determines CSI reference resources to be used for triggered CSI reporting. The above process can be considered as the basic process of finding the closest CSI-RS/CSI-IM/SSB that satisfies the processing time required for CSI reporting (denoted as Z or Z'). In some implementations of the present disclosure, when the UE considers CSI reference resources to determine whether to perform partial CSI reporting, shorter CSI processing time may be assumed. For example, the CSI processing time required for partial CSI reporting can be considered, expressed as Z _pCSI . In this case, Z _pCSI smaller than Z or Z' may be predefined, determined by the UE's capability signaling, or determined by higher layer signaling or L1 signaling from the BS. In some implementations of the present disclosure, if the CSI reference resources satisfy Z _pCSI (where Z _pCSI < Z and Z _pCSI <Z'), the UE performs partial CSI reporting based on the CSI reference resources. If the CSI reference resource not only satisfies Z but also satisfies Z or Z', the UE may perform regular full CSI reporting based on the CSI reference resource.

For Z _pCSI , the following methods can be considered to select CSI reference resources.

>For periodic and semi-persistent CSI reporting

>>In some implementations of the present disclosure, considering the number of time slots (denoted as n _{CSI_ref} ) used in the process of determining the CSI reference resources defined in Section 5.2.2.5 of 3GPP TS 38.214, n _{CSI_ref} is greater than Or equal to the minimum value of X*2^u _DL such that the resource corresponds to a valid DL symbol. In some implementations, X may be an integer less than 5, such as 1, 2, or 3. In some implementations, X may be greater than floor(Z _pCSI /N ^slot _symb ).

>>Alternatively, in some implementations of the present disclosure, consider the number of slots denoted n _{CSI_ref} used in the process of determining the CSI reference resources defined in Section 5.2.2.5 of 3GPP TS 38.214, n _{CSI_ref} is a smaller value greater than or equal to floor(Z _pCSI /N ^slot _symb ) such that the resource corresponds to a valid DL symbol.

> Aperiodic CSI reporting for CSI requests in slot n'

>>In some implementations of the present disclosure, considering the number of slots represented as n _{CSI_ref} used in the process of determining the CSI reference resources defined in Section 5.2.2.5 of 3GPP TS 38.214, if the UE is instructed by DCI to CSI is reported in the same slot as the slot in which the CSI request was received, then n _{CSI_ref} is to ensure that the reference resource is in the same valid DL slot as the corresponding CSI request. Otherwise, n _{CSI_ref} is the minimum value greater than or equal to floor(Z _pCSI /N ^slot _symb ) such that the slot (nn _{CSI_ref} ) is a valid DL slot. In this case, DL slot n is defined by UL slot n' as described in section 5.2.2.5 of 3GPPTS 38.214.

> If periodic or semi-persistent CSI-RS/CSI-IM or SSB is used for channel/interference measurements, the UE is not expected to measure channel/interference on CSI-RS/CSI-IM/SSB where in aperiodic CSI reporting The last OFDM symbol is received until the Z _pCSI symbol before the transmission time of the first OFDM symbol.

According to some implementations of the present disclosure, when the UE transmits CSI, the UE may selectively include CQI, RI, and PMI in the CSI report as part of the total CSI that the UE is configured and/or instructed to report.

The following UE operations may further be considered in some implementations of the present disclosure.

<Implementation A1>Conditional partial CSI reporting

When the UE is capable of performing partial CSI reporting and the UE is configured with a CSI configuration that allows partial CSI reporting, the UE may perform partial CSI reporting only under predetermined conditions. For example, consider at least one of the following conditions:

>The L1 signaling (eg, DCI) that triggers the corresponding CSI configuration includes an indicator indicating partial CSI reporting.

>The RI and/or PMI values among the previously reported CSI values remain within a certain threshold range T for K consecutive times (in other words, for any two values selected among the K previously reported values, the difference between these two values The difference between them is within T). In this case, each of K and T may have a predefined value or a value configured or indicated by higher layer parameters or L1 signaling from the BS. The previously reported CSI value may be a value associated with a specific CSI configuration. For example, the specific CSI configuration may be a CSI configuration used for partial CSI reporting or a CSI configuration related thereto.

> Figure 9 illustrates an example of partial CSI reporting in accordance with some implementations of the present disclosure. Partial CSI reporting may be performed based on a time interval between PUSCH/PUCCH resources on which CSI is to be reported and measurement resources to be used for CSI reporting. For example, referring to Figure 9, when the time interval from the end of the last symbol of the measurement resource to be used to the start of the first symbol of the PUSCH/PUCCH resource on which CSI is to be reported is less than the prescribed time interval T1 and greater than or equal to the prescribed time interval At T2, partial CSI reporting can be performed, where T1>T2.

>>The time interval T1 can represent the conventionally required CSI processing time. For example, the time interval T1 may be a predefined processing time to ensure the time required to calculate the full set of CSI values configured to be included in the triggered CSI report. For example, the time interval T1 may refer to the symbol length Z or Z' or the CSI calculation time T _proc,CSI or T' _proc,CSI obtained from the symbol length Z or Z', as defined in Section 5.4 of 3GPP TS 38.214. For example, referring to Section 5.4 of 3GPP TS 38.214Rel-16, when the CSI request field on DCI triggers CSI reporting on PUSCH, the UE shall provide a valid CSI report for the nth triggered report under the following circumstances: If the bearer The first uplink symbol of the corresponding CSI report including the impact of timing advance does not start earlier than symbol Z _ref , and if the first uplink symbol carrying the nth CSI report including the impact of timing advance does not start earlier than symbol DCI Z' _ref (n) starts, where Z _ref is defined as the next uplink symbol whose CP starts at T _{proc, CSI} = (Z)*(2048+144) after the end of the last symbol of the PDCCH that triggers CSI reporting )*κ*2 ^-u *T _c +T _switch , and where Z' _ref (n) is defined as the next uplink symbol whose CP starts at T' _{proc after the end of the last symbol at the following latest time, CSI} = (Z')*(2048+144)*κ*2 ^-u *T _c : When aperiodic CSI-RS is used for channel measurement of the nth triggered CSI report, aperiodic for channel measurement periodic CSI-RS resources, aperiodic CSI-IM for interference measurement, and aperiodic NZP CSI-RS for interference measurement, and wherein T _switch is applied only when Z ₁ in Table 7 is applied. As mentioned above, Z, Z' and u can be defined as follows: Z=max _m=0,...,M-1 (Z(m)) and Z'=max _m=0,...,M-1 (Z'(m)). Here, M represents the number of updated CSI reports, (Z(m), Z'(m)) corresponds to the m-th updated CSI report and is defined as (Z ₁ , Z ₁ ' in Table 7 according to the predetermined condition ), (Z ₁ , Z ₁ ') in Table 8, (Z ₃ , Z ₃ ') in Table 8 or (Z ₂ , Z ₂ ') in Table 8.

>>The time interval T2 may represent the CSI processing time required for partial CSI reporting in terms of measurement resources. T2 may be a predefined value, a value determined by the UE's capability signaling, or a value determined by higher layer signaling or L1 signaling from the BS.

> Figure 10 illustrates another example of partial CSI reporting in accordance with some implementations of the present disclosure. The UE may perform partial CSI reporting based on the time interval between the PUSCH/PUCCH resources on which CSI is to be reported and the reception of DCI that triggers the CSI reporting. For example, referring to Figure 10, when the time interval from the end of the last symbol of the PDCCH on which the DCI triggering the CSI report is received to the start of the first symbol of the PUSCH/PUCCH resource on which the CSI is to be reported is less than the prescribed time interval T2 and greater than or Equal to the specified time interval T4, partial CSI reporting can be performed, where T3>T4.

>>The time interval T3 can represent the conventionally required CSI processing time. For example, the time interval T3 may be a predefined processing time to ensure the time required to calculate the full set of CSI values configured to be included in the triggered CSI report. For example, the time interval T3 may refer to the CSI calculation time defined in Section 5.4 of 3GPP TS 38.214 (eg, T _proc,CSI or T' _proc,CSI ).

>>The time interval T4 may represent the CSI processing time required for partial CSI reporting in terms of DCI reception. T4 may be a predefined value, a value determined by the UE's capability signaling, or a value determined by higher layer signaling or L1 signaling from the BS.

When the conditions are not met: For example, see Figure 9, when the time interval from the end of the last symbol of the measurement resource to be used to the start of the first symbol of the PUSCH/PUCCH resource on which CSI is to be reported is greater than or equal to the specified time every T1; or for example, see Figure 10, when the time interval from the end of the last symbol of the PDCCH on which the DCI triggering the CSI report is received to the start of the first symbol of the PUSCH/PUCCH resource on which the CSI is to be reported is greater than or equal to the specified During the time interval T3, the UE may perform regular CSI reporting including all information based on the CSI configuration that allows partial CSI reporting.

In other cases where the conditions are not met: for example, see Figure 9, when the time interval from the end of the last symbol of the measurement resource to be used to the beginning of the first symbol of the PUSCH/PUCCH resource on which CSI is to be reported is less than the specified time interval At T2, the UE may perform regular CSI reporting including all information based on the CSI configuration that allows partial CSI reporting. To this end, the UE may determine measurement resources for which the time interval from the end of the last symbol of the measurement resource to be used to the start of the first symbol of the PUSCH/PUCCH resource on which CSI is to be reported is greater than the prescribed time interval T1 as the corresponding CSI New measurement resources reported.

<Implementation A1-1> CSI indicator for partial CSI reporting

When the UE transmits partial CSI by performing partial CSI reporting according to predetermined conditions as described in Implementation A1/B1, the UE may arbitrarily perform partial CSI reporting or full CSI reporting according to the situation. That is, when the UE performs partial CSI reporting according to a predetermined condition and when determining whether the condition is satisfied based on information derived by the UE, the BS may not predict whether the UE will perform partial CSI reporting or full CSI reporting. In addition, when the BS does not know the total bit size of the UL transmission performed by the UE, it may be difficult for the BS to perform decoding of the corresponding UL transmission. Therefore, the UE may need to indicate to the BS whether the UL transmission is a partial CSI report or a full CSI report. To indicate whether to perform partial CSI reporting, at least one of the following methods may be used.

*The UE may perform encoding of bit information of a predefined length representing the total bit length of the CSI report separately from the CSI report, and then append the bit information of the predefined length to the CSI report.

*The UE may separately perform encoding of 1-bit information indicating whether to perform partial CSI reporting, and then append the 1-bit information to the CSI report.

*UE can use different CRC masks for partial CSI reporting and full CSI reporting. In this case, the value configured to the UE through each CSI configuration may be used as information for the CRC mask.

*UE can use different scrambling sequences for partial CSI reporting and full CSI reporting. In this case, the value configured to the UE through each CSI configuration may be used as information for deriving the scrambling sequence.

*UE can use different PUCCH resources for partial CSI reporting and full CSI reporting. To this end, PUCCH resources to be used for partial CSI reporting may be additionally configured in the CSI configuration provided to the UE.

*The UE may perform reporting by including partial CSI reporting in Part 2 of the related art Type I and Type II CSI. According to 3GPP TS 38.214, for CSI feedback on PUSCH, such as Type I CSI, Type IICSI and enhanced Type IICSI, the CSI report consists of two parts. Part 1 has a fixed payload size and is used to identify the number of information bits in Part 2. The entire content of Part 1 is sent before Part 2. In other words, the UE may include the partial CSI report in Part 2 and indicate whether partial CSI is included through Part 1. Therefore, the BS can estimate the bit length of Part 2 by receiving and decoding Part 1 of fixed bit length, and successfully receive the partial CSI report. For the above operation, information indicating whether to perform partial CSI reporting may be included in Part 1 of CSI.

*UE can perform CSI reporting by adding partial CSI reporting to regular Type I and Type II CSI as Additional Part 3. According to 3GPP TS 38.214, for CSI feedback on PUSCH, such as Type I CSI, Type IICSI and enhanced Type IICSI, the CSI report consists of two parts. Part 1 has a fixed payload size and is used to identify the number of information bits in Part 2. The entire content of Part 1 is sent before Part 2. If the UE includes the partial CSI report in the new part 3 and indicates whether to include the partial CSI through part 1, the UE can notify whether to include the partial CSI report, not only without any changes to the existing part 2 CSI, but also in terms of bit size There is no ambiguity. Therefore, the BS can estimate the bit length of Part 2 by receiving and decoding Part 1 of fixed bit length, and successfully receive the partial CSI report. For the above operation, information indicating whether to perform partial CSI reporting may be included in Part 1 of CSI. The corresponding information may be encoded separately from other values in CSI part 1. In addition, the CSI part 3 newly added in the above operation may be encoded separately from other CSI parts.

*The UE may include a part of the partial CSI in part 1 of regular type I and IICSI, and the remaining part of the partial CSI in its second part. In this case, whenever the corresponding CSI report is transmitted, the partial CSI included in Part 1 may always be transmitted regardless of whether the predetermined condition is satisfied. Alternatively, the partial CSI included in Part 1 may always be zero-padded as much as the size of bits to be transmitted, and then transmitted. The partial CSI included in Part 2 may be transmitted depending on whether a predetermined condition is satisfied. In this case, the CSI included in Part 1 may be composed of information about a specific subband, such as a subband with an even or odd index. Therefore, even if the BS fails to receive Part 2 CSI due to ambiguity, the BS can receive CSI on all radio resources through Part 1.

<Implementation A2> Hierarchical CSI configuration for partial CSI reporting

The UE may receive two or more CSI configurations from the BS to perform partial CSI reporting. In this case, among the CSI configurations, one or more CSI configurations X may be used for partial CSI reporting, and one or more other CSI configurations Y may be used for general CSI reporting. Each CSI configuration configured for partial CSI reporting may be associated with one or more CSI configurations Y. For example, CSI configuration X may be configured to have one or more CSI configurations Y as reference CSI configurations. Alternatively, for one CSI configuration Y, a parent-child relationship can be established, with Y as the parent and X as the child.

When at least one of the conditions shown in implementation A1/B1 is satisfied for CSI configuration Y, the UE may consider that partial CSI reporting is triggered for CSI configuration X associated with CSI configuration Y. Therefore, the UE can perform partial CSI reporting. For example, partial CSI reporting may be triggered based on another CSI configuration associated with partial CSI configuration X. Therefore, partial CSI reporting can be performed. Such triggering may be performed based on CSI reported through other CSI configurations.

<Implementation A3> PUCCH resource selection for partial CSI reporting

In systems based on some scenarios (eg, NR Rel-16 based systems), the UE may indicate or configure the PUCCH for the corresponding PUCCH transmission based on the size of all UCI bits to be included in the PUCCH for PUCCH transmission. Resource set to determine the PUCCH to send. If multiple PUCCH transmissions overlap in time, the PUCCH to use may be determined based on the size of all UCI bits to be sent in the overlapping PUCCH and the type of UCI (eg, SR, HARQ-ACK, CSI, etc.).

The BS needs to know the exact size of all UCI bits sent by the UE to predict PUCCH transmission from the UE. However, when some implementations of the present disclosure are applied or when the UE autonomously performs partial CSI reporting, the total UCI bit size may vary depending on whether partial CSI reporting is performed. This may lead to ambiguity between UE and BS. In order to solve this problem, at least one of the following methods may be used to ensure that the UE and the BS determine the same PUCCH resources.

> When selecting PUCCH resources, the UE and BS can adopt a specific value for the UCI size of the partial CSI report. The specific value can be determined regardless of whether the partial CSI report is actually performed.

>>The specific value may be a predefined value, a value configured by higher layer signaling from the BS, or a value indicated by L1 signaling. For example, the specific value may be a value determined based on a parameter in a CSI configuration associated with the partial CSI report, or correspond to a maximum length of CSI bits that can be sent based on the corresponding CSI configuration.

>>If the specific value is less than the actual bit length of the CSI required for transmission, the UE can omit part of the CSI so that the CSI bit length becomes less than or equal to the specific value. In order to achieve this operation, a specific value can be set as the upper limit of the CSI bit length that can be included in the UCI multiplexing process. Such a process may be performed for each component of CSI, and in this case, the specific value may be an upper limit of the bit size of the part including the partial CSI report.

If partial CSI reports are sent only when predetermined conditions are met, the UE and BS can assume that partial CSI reports are always sent on configured resources, and then select PUCCH resources for CSI reporting.

<Implementation A4> Extended CQI bit range

When the UE reports CQI information as part of CSI, a larger bit size may be allocated for the CQI report to enhance the accuracy of the CQI information. Specifically, when the UE reports the CQI value of each subband, it may be considered to use a 3-bit differential CQI table or a 4-bit CQI table instead of using a 2-bit differential CQI table. For partial CQI reporting, this operation may be beneficial since CQI information is expanded and transmitted instead of RI/PMI. Furthermore, this operation can improve the accuracy of CQI information even when partial CQI reporting is not performed. For example, the 3-bit differential CQI table shown in Table 9 can be used. Alternatively, one of the 4-bit CQI tables shown in Table 10 to Table 13 may be used.

Table 9

Subband differential CQI value offset level 0 0 1 1 2 2 3 3 4 ≥4 5 -1 6 -2 7 ≤-3

Table 10

Table 11

Table 12

Table 13

The higher layer parameter cqi-Table in the CSI-ReportConfig provided by the BS configures table1 corresponding to table 10, table2 corresponding to table 11, table3 corresponding to table 12, or table4 corresponding to table 13.

However, if a 3-bit differential CQI table or a 4-bit CQI table is always used for all subbands, the CSI overhead may increase. To solve this problem, consider at least one of the following methods.

*Method 1: The most significant bit (MSB) of the bit sequence in which Part 1 CSI or subband CQI is included may contain the bit length for all or part of the subband CQI. The UE may extend the per-subband CQI to the bit length to be used by the CQI and report the subband CQI as partial 2 CSI. The UE is allowed to send extended CQI information only when the UE needs to send extended CQI information. For example, the UE may report CSI by including one bit indicating the bit length to be used for the subband CQI in Part 1 CSI (e.g., "0" = legacy and "1" = extended to three bits), And includes the subband CQI to which the extended CQI bit range is applied in Part 2 CSI. When receiving CSI, the BS can interpret the subband CQI to be reported in Part 2 CSI.

Additionally, in some implementations of the present disclosure, subband CSI reports to which the extended CQI bit range is applied may be assigned a higher priority than other CSI reports. For example, when the priority of the CSI report is determined as follows, the value of y or k can be determined according to whether the extended CQI bit range is applied: CSI report with Pri _iCSI (y,k,c,s)=2*N _cells *M The priority values of _s *y+N _cells *M _s *k+M _s *c+s are related, where:

> For aperiodic CSI reports to be carried on PUSCH, y=0, for semi-persistent CSI reports to be carried on PUSCH, y=1, for semi-persistent CSI reports to be carried on PUCCH, y=2, For periodic CSI reports to be carried on PUCCH, y=3;

> For CSI reports carrying L1-RSRP or L1-SINR, k=0, and for CSI reports not carrying L1-RSRP or L1-SINR, k=1;

>c is the serving cell index, and N _cells is the value of the higher layer parameter maxNrofServingCells provided by the BS; and

>s is reportConfigID, M _s is the value of the higher layer parameter maxNrofCSI-ReportConfigurations provided by the BS.

If the correlation value of Pri _iCSI (y, k, c, s) for the first CSI report is lower than for the second CSI report, it can be said that the first CSI report has priority over the second CSI report.

As an example, when applying the extended CQI bit range, k may be determined as follows: k=0 or k=-1.

As another example, when the extended CQI bit range is applied, a value obtained by subtracting 0.5 or 1 from the determined value of k may be used. If the value of k is less than 0 due to the above operation, k=0 can be used.

As another example, when the extended CQI bit range is applied, a value obtained by subtracting 0.5 or 1 from the determined y value may be used. If the value of y is less than 0 due to the above operation, you can use y=0.

BS side:

The above-described implementation of the present disclosure will be explained from the perspective of the BS again. Figure 11 illustrates an operational flow of a BS according to some implementations of the present disclosure.

The BS can configure the higher layer parameters required for CSI transmission to the UE. Only when conditions according to some implementations of the present disclosure are met, the BS may expect partial CSI reports by the UE and receive the CSI reports from the UE and perform decoding thereon. Alternatively, the BS may identify whether the UE performs partial CSI reporting or full CSI reporting by performing blind decoding of the partial CSI report or based on an indicator included in the CSI transmission. The BS can then receive the CSI report from the UE and perform decoding on it. In some implementations of the present disclosure, the following BS operations may be considered.

The BS may send one or more RRC configurations for CSI reception to the UE (S1101). The RRC configuration can be sent separately for each CSI configuration.

The BS may trigger CSI reporting to the UE (S1103). The BS may receive triggered CSI reports on PUCCH resources or PUSCH resources.

According to some implementations of the present disclosure, when receiving CSI, the BS may assume that the UE will optionally update CQI, RI, and PMI information. In other words, according to some implementations of the present disclosure, the BS may receive a partial CSI report reporting based on the partial CSI from the UE (S1105). For example, to determine whether the UE performs partial CSI reporting, the BS may assume that the UE will consider the time domain location of the last measurement resource to be used for CSI reporting.

The following BS operations may further be considered in some implementations of the present disclosure.

<Implementation B1>Conditional partial CSI reporting

When the UE is capable of performing partial CSI reporting and the UE is configured with a CSI configuration that allows partial CSI reporting, the BS may assume that the UE will only perform partial CSI reporting under predetermined conditions. For example, consider at least one of the following conditions:

>L1 signaling (eg, DCI) that triggers corresponding CSI configuration includes an indicator indicating partial CSI reporting.

>The RI and/or PMI values among the previously reported CSI values remain within a certain threshold range T for K consecutive times (in other words, for any two values selected among the K previously reported values, the difference between these two values The difference between them is within T). In this case, each of K and T may have a predefined value or a value configured or indicated by higher layer parameters or L1 signaling from the BS. The previously reported CSI value may be a value associated with a specific CSI configuration. For example, the specific CSI configuration may be a CSI configuration used for partial CSI reporting or a CSI configuration related thereto.

>Partial CSI reporting may be performed based on the time interval between the PUSCH/PUCCH resources on which CSI is to be reported and the measurement resources to be used for CSI reporting. For example, referring to Figure 9, when the time interval from the end of the last symbol of the measurement resource to be used to the start of the first symbol of the PUSCH/PUCCH resource on which CSI is to be reported is less than the prescribed time interval T1, and is greater than or equal to the prescribed time During interval T2, partial CSI reporting can be performed, where T1>T2.

>>The time interval T1 can represent the conventionally required CSI processing time. For example, the time interval T1 may be a predefined processing time to ensure the time required to calculate the full set of CSI values configured to be included in the triggered CSI report. For example, the time interval T1 may refer to the symbol length Z or Z' or the CSI calculation time T _proc,CSI or T' _proc,CSI obtained from the symbol length Z or Z', as defined in Section 5.4 of 3GPP TS 38.214. For example, referring to Section 5.4 of 3GPP TS 38.214Rel-16, when the CSI request field on DCI triggers CSI reporting on PUSCH, the UE shall provide a valid CSI report for the nth triggered report under the following circumstances: If using The first uplink symbol carrying the corresponding CSI report including the impact of timing advance does not start earlier than symbol Z _ref , and if the first uplink symbol carrying the nth CSI report including the impact of timing advance does not Start earlier than the symbol DCI Z' _ref (n), where Z _ref is defined as the next uplink symbol whose CP starts at T _proc,CSI = (Z)*( after the end of the last symbol of the PDCCH that triggered the CSI report 2048+144)*κ*2 ^-u *T _c +T _switch , and where Z' _ref (n) is defined as the next uplink symbol whose CP starts at T after the end of the last symbol of the latest time below ' _proc,CSI = (Z')*(2048+144)*κ*2 ^-u *T _c : When aperiodic CSI-RS is used for channel measurement of the nth triggered CSI report, it is used for channel measurement aperiodic CSI-RS resources, aperiodic CSI-IM for interference measurement, and aperiodic NZP CSI-RS for measurement, and where T _switch is applied only when Z ₁ in Table 7 is applied . As mentioned above, Z, Z' and u can be defined as follows: Z=max _m=0,...,M-1 (Z(m)) and Z'=max _m=0,...,M-1 (Z'(m)). Here, M represents the number of updated CSI reports, (Z(m), Z'(m)) corresponds to the m-th updated CSI report and is defined as (Z ₁ , Z ₁ ') in Table 7 according to the predetermined condition , (Z ₁ , Z ₁ ') in Table 8, (Z ₃ , Z ₃ ') in Table 8 or (Z ₂ , Z ₂ ') in Table 8.

>>The time interval T2 may represent the CSI processing time required for partial CSI reporting in terms of measurement resources. T2 may be a predefined value, a value determined by the UE's capability signaling, or a value determined by higher layer signaling or L1 signaling from the BS.

>The UE may perform partial CSI reporting based on the time interval between the PUSCH/PUCCH resource on which the CSI is to be reported and the reception of the DCI that triggers the CSI reporting. For example, referring to Figure 10, when the time interval from the end of the last symbol of the PDCCH on which the DCI triggering the CSI report is received to the start of the first symbol of the PUSCH/PUCCH resource on which the CSI is to be reported is less than the prescribed time interval T2 and greater than or When equal to the specified time interval T4, partial CSI reporting can be performed, where T3>T4.

>>The time interval T3 can represent the conventionally required CSI processing time. For example, the time interval T3 may be a predefined processing time to ensure the time required to calculate the full set of CSI values configured to be included in the triggered CSI report. For example, the time interval T3 may refer to the CSI calculation time defined in Section 5.4 of 3GPP TS 38.214 (eg, T _proc,CSI or T' _proc,CSI ).

>>The time interval T4 may represent the CSI processing time required for partial CSI reporting in terms of DCI reception. T4 may be a predefined value, a value determined by the UE's capability signaling, or a value determined by higher layer signaling or L1 signaling from the BS.

When the conditions are not met: For example, see Figure 9, when the time interval from the end of the last symbol of the measurement resource to be used to the start of the first symbol of the PUSCH/PUCCH resource on which CSI is to be reported is greater than or equal to the specified time every T1; or for example, referring to Figure 10, when the time interval from the end of the last symbol of the PDCCH on which the DCI triggering the CSI report is received to the start of the first symbol of the PUSCH/PUCCH resource on which the CSI is to be reported is greater than or equal to the specified time At interval T3, the BS may assume that the UE will perform regular CSI reporting including all information based on the CSI configuration that allows partial CSI reporting.

In other cases where the conditions are not met: for example, see Figure 9, when the time interval from the end of the last symbol of the measurement resource to be used to the start of the first symbol of the PUSCH/PUCCH resource on which CSI is to be reported is less than the prescribed time interval T2 , the BS may assume that the UE will perform regular CSI reporting including all information based on the CSI configuration that allows partial CSI reporting. To this end, the BS may assume that the UE will determine the measurement resources for which the time interval from the end of the last symbol of the measurement resource to be used to the start of the first symbol of the PUSCH/PUCCH resource on which the CSI is to be reported is as The new measurement resource of the corresponding CSI report is greater than the specified time interval T1.

<Implementation B1-1> CSI indicator for partial CSI reporting

When the UE transmits partial CSI by performing partial CSI reporting according to predetermined conditions as described in Implementation A1/B1, the UE may arbitrarily perform partial CSI reporting or full CSI reporting according to the situation. That is, when the UE performs partial CSI reporting according to a predetermined condition and when determining whether the condition is satisfied based on information derived by the UE, the BS may not predict whether the UE will perform partial CSI reporting or full CSI reporting. In addition, when the BS does not know the total bit size of the UL transmission performed by the UE, it may be difficult for the BS to perform decoding of the corresponding UL transmission. Therefore, the UE may need to indicate to the BS whether the UL transmission is a partial CSI report or a full CSI report. To indicate whether to perform partial CSI reporting, at least one of the following methods may be used. In addition, the BS may receive the CSI report from the UE by assuming the following method.

*The BS may assume that the UE will perform encoding of bit information of a predefined length representing the total bit length of the CSI report separately from the CSI report, and then append the bit information of the predefined length to the CSI report.

*The BS may assume that the UE will separately encode 1-bit information indicating whether to perform partial CSI reporting, and then append the 1-bit information to the CSI report.

*The BS may assume that the UE will use different CRC masks for partial CSI reporting and full CSI reporting. In this case, the value configured to the UE through each CSI configuration may be used as information for the CRC mask.

*The BS may assume that the UE will use different scrambling sequences for partial CSI reporting and full CSI reporting. In this case, the value configured to the UE through each CSI configuration may be used as information for deriving the scrambling sequence.

*The BS may assume that the UE will use different PUCCH resources for partial CSI reporting and full CSI reporting. To this end, PUCCH resources to be used for partial CSI reporting may be additionally configured in the CSI configuration provided to the UE.

*The BS may assume that the UE will perform reporting by including partial CSI reporting in the related art Type I and Part 2 of Type II CSI. According to 3GPP TS 38.214, for CSI feedback on PUSCH, such as Type I CSI, Type IICSI and enhanced Type IICSI, the CSI report consists of two parts. Part 1 has a fixed payload size and is used to identify the number of information bits in Part 2. The entire content of Part 1 is sent before Part 2. In other words, the BS may assume that the UE will include partial CSI reporting in Part 2. And indicate whether partial CSI is included via Part 1. Therefore, the BS can estimate the bit length of Part 2 by receiving and decoding Part 1 of fixed bit length, and successfully receive the partial CSI report. For the above operation, information indicating whether to perform partial CSI reporting may be included in Part 1 of CSI.

*The BS may assume that the UE will perform CSI reporting by adding partial CSI reporting to regular Type I and Type II CSI as Additional Part 3. According to 3GPP TS 38.214, for CSI feedback on PUSCH, such as Type I CSI, Type IICSI and enhanced Type IICSI, the CSI report consists of two parts. Part 1 has a fixed payload size and is used to identify the number of information bits in Part 2. The entire content of Part 1 is sent before Part 2. If the UE includes the partial CSI report in the new part 3 and indicates whether to include the partial CSI through part 1, the UE can notify whether to include the partial CSI report, not only without any changes to the existing part 2 CSI, but also in terms of bit size There is no ambiguity. Therefore, the BS can estimate the bit length of Part 2 by receiving and decoding Part 1 of fixed bit length, and successfully receive the partial CSI report. For the above operation, information indicating whether to perform partial CSI reporting may be included in Part 1 of CSI. The corresponding information may be encoded separately from other values in Part 1 of the CSI. In addition, the CSI part 3 newly added in the above operation may be encoded separately from other CSI parts.

*The BS may assume that the UE will include part of the partial CSI in part 1 of regular type I and IICSI, and include the remainder of the partial CSI in part 2 of it. In this case, whenever the corresponding CSI report is transmitted, the partial CSI included in Part 1 may always be transmitted regardless of whether the predetermined condition is satisfied. Alternatively, the partial CSI included in Part 1 may always be zero-padded as much as the size of bits to be transmitted, and then transmitted. The partial CSI included in Part 2 may be transmitted depending on whether a predetermined condition is satisfied. In this case, the CSI included in Part 1 may be composed of information about a specific subband, such as a subband with an even or odd index. Therefore, even if the BS fails to receive Part 2 CSI due to ambiguity, the BS can receive CSI on all radio resources through Part 1.

<Implementation B2> Hierarchical CSI configuration for partial CSI reporting

The BS may provide two or more CSI configurations to the UE to enable the UE to perform partial CSI reporting. In this case, among the CSI configurations, one or more CSI configurations X may be used for partial CSI reporting, and one or more other CSI configurations Y may be used for general CSI reporting. Each CSI configuration configured for partial CSI reporting may be associated with one or more CSI configurations Y. For example, CSI configuration X may be configured to have one or more CSI configurations Y as reference CSI configurations. Alternatively, for one CSI configuration Y, a parent-child relationship can be established, with Y as the parent and X as the child.

When at least one of the conditions shown in implementation A1/B1 is satisfied for CSI configuration Y, the BS may assume that the UE will consider partial CSI reporting to be triggered for CSI configuration X associated with CSI configuration Y. Therefore, the BS may assume that the UE will perform partial CSI reporting. For example, the BS may assume that partial CSI reporting will be triggered to the UE based on another CSI configuration associated with partial CSI configuration X. Therefore, the BS may assume that the UE will perform partial CSI reporting. Such triggering may be performed based on CSI reported through other CSI configurations.

<Implementation B3> PUCCH resource selection for partial CSI reporting

In systems based on some scenarios (eg, NR Rel-16 based systems), the UE may indicate or configure a value based on the size of all UCI bits to be included in the PUCCH for PUCCH transmission and the corresponding PUCCH transmission. Group PUCCH resources to determine the PUCCH to use. If multiple PUCCH transmissions overlap in time, the PUCCH to use may be determined based on the size of all UCI bits to be sent in the overlapping PUCCH and the type of UCI (eg, SR, HARQ-ACK, CSI, etc.).

The BS needs to know the exact size of all UCI bits sent by the UE to predict PUCCH transmission from the UE. However, when some implementations of the present disclosure are applied or when the UE autonomously performs partial CSI reporting, the total UCI bit size may vary depending on whether partial CSI reporting is performed. This may lead to ambiguity between UE and BS. In order to solve this problem, at least one of the following methods may be used to ensure that the UE and the BS determine the same PUCCH resources.

> When selecting PUCCH resources, the UE and BS can assume a specific value for the UCI size of the partial CSI report. The specific value can be determined regardless of whether the partial CSI report is actually performed.

>>The specific value may be a predefined value, a value configured by higher layer signaling from the BS, or a value indicated by L1 signaling. For example, the specific value may be a value determined based on a parameter in a CSI configuration associated with the partial CSI report, or correspond to a maximum length of CSI bits that can be sent based on the corresponding CSI configuration.

>>If the specific value is less than the actual bit length of the CSI required for transmission, the UE can omit part of the CSI so that the CSI bit length becomes less than or equal to the specific value. In order to achieve this operation, a specific value can be set as the upper limit of the CSI bit length that can be included in the UCI multiplexing process. Such a process may be performed for each component of CSI, and in this case, the specific value may be an upper limit of the bit size of the part including the partial CSI report.

> If partial CSI reports are sent only when predetermined conditions are met, the UE and BS can assume that partial CSI reports are always sent on the configured resources, and then select PUCCH resources for CSI reporting.

<Implementation B4> Extended CQI bit range

When the UE reports CQI information as part of CSI, a larger bit size may be allocated for the CQI report to enhance the accuracy of the CQI information. Specifically, when the UE reports the CQI value of each subband, it may be considered to use a 3-bit differential CQI table or a 4-bit CQI table instead of using a 2-bit differential CQI table. For partial CQI reporting, this operation may be beneficial since CQI information is expanded and sent instead of RI/PMI. Furthermore, this operation can improve the accuracy of CQI information even when partial CQI reporting is not performed. For example, the 3-bit differential CQI table shown in Table 9 can be used. Alternatively, one of the 4-bit CQI tables shown in Table 10 to Table 13 may be used.

However, if a 3-bit differential CQI table or a 4-bit CQI table is always used for all subbands, the CSI overhead may increase. To solve this problem, consider at least one of the following methods.

*Method 1: The MSB of the bit sequence which includes part 1 CSI or sub-band CQI may contain all or part of the bit length of the sub-band CQI. The BS may assume that the UE extends the per-subband CQI to the bit length to be used by the CQI and reports the subband CQI as partial 2 CSI. The UE is allowed to send extended CQI information only when the UE needs to send extended CQI information. For example, the BS may assume that the UE will report CSI by including one bit in Part 1 CSI indicating the bit length to be used for the subband CQI (e.g., "0" = regular and "1" = extended to three bits), and the subband CQI to which the extended CQI bit range is applied is included in Part 2 CSI. When receiving CSI, the BS can interpret the subband CQI to be reported in Part 2 CSI.

Additionally, in some implementations of the present disclosure, subband CSI reports to which the extended CQI bit range is applied may be assigned a higher priority than other CSI reports. For example, when the priority of the CSI report is determined as follows, the value of y or k can be determined according to whether the extended CQI bit range is applied: CSI report with Pri _iCSI (y,k,c,s)=2*N _cells *M The priority values of _s *y+N _cells *M _s *k+M _s *c+s are related, where:

> For aperiodic CSI reports to be carried on PUSCH, y=0, for semi-persistent CSI reports to be carried on PUSCH, y=1, for semi-persistent CSI reports to be carried on PUCCH, y=2, For periodic CSI reports to be carried on PUCCH, y=3;

> For CSI reports carrying L1-RSRP or L1-SINR, k=0, and for CSI reports not carrying L1-RSRP or L1-SINR, k=1;

>c is the serving cell index, N _cells is the value of the higher layer parameter maxNrofServingCells provided by the BS; and

>s is reportConfigID, M _s is the value of the higher-layer parameter maxNrofCSI-ReportConfigurations provided by the BS.

If the correlation value of Pri _iCSI (y,k,c,s) for the first CSI report is lower than for the second CSI report, it can be said that the first CSI report has a higher priority than the second CSI report .

As an example, when applying the extended CQI bit range, k may be determined as follows: k=0 or k=-1.

As another example, when the extended CQI bit range is applied, a value obtained by subtracting 0.5 or 1 from the determined value of k may be used. If the value of k is less than 0 due to the above operation, k=0 can be used.

As another example, when the extended CQI bit range is applied, a value obtained by subtracting 0.5 or 1 from the determined y value may be used. If the value of y is less than 0 due to the above operation, you can use y=0.

In some implementations of the present disclosure, the UE and the BS may configure higher layer parameters required for CSI reporting (eg, parameters of CSI-ReportConfig, parameters of CSI-ResourceConfig, etc.). If the conditions for triggering partial CSI reporting are met according to some implementations of the present disclosure, the UE reuses separately configured PUCCH resources or PUCCH resources for regular CSI reporting (eg, existing PUCCH resources configured for regular CSI reporting) in order to perform Part of the CSI report. The BS may expect that the UE will perform partial CSI reporting only when conditions according to some implementations of the present disclosure are met. The BS can then receive the CSI report from the UE and perform decoding on it. Alternatively, in some implementations of the present disclosure, the BS may identify the partial CSI report performed by the UE by performing blind decoding of the partial CSI report or based on an indicator included in the CSI transmission. The BS can then receive and decode the partial CSI report.

According to some implementations of the present disclosure, the UE may send CSI that does not contain certain contents (eg, certain CSI parameters), thereby reducing the CSI processing time of the UE. Therefore, the UE can reduce the delay time required to report the overall channel status and report CSI to the BS with high accuracy. Considering that the UE uses less information for CSI reporting, the BS can use less radio resources to achieve the same level of reliability, which can help save overall UL system resources.

A UE may perform operations associated with transmission of CSI reports in accordance with some implementations of the present disclosure. The UE may include: at least one transceiver; at least one processor; and at least one computer memory operatively connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to Operations are performed in accordance with some implementations of the present disclosure. Processing apparatus for a UE may include: at least one processor; and at least one computer memory operatively connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to Operations are performed in accordance with some implementations of the present disclosure. A computer-readable (non-transitory) storage medium may store at least one computer program including instructions that, when executed by at least one processor, cause the at least one processor to perform operations in accordance with some implementations of the present disclosure. A computer program or computer program product may include instructions stored on at least one computer-readable (non-volatile) storage medium and which, when executed, cause (at least one processor) to perform operations in accordance with some implementations of the present disclosure . In the UE, the processing device, the computer-readable (non-transitory) storage medium and/or the computer program product, the operations may include: receiving an RRC configuration related to the CSI report; receiving trigger information, the trigger information triggering is configured by the RRC configuration reporting of CSI value sets; determining measurement resources for CSI reporting and UL resources for CSI reporting based on radio resource configuration and trigger information; and performing partial CSI based on the time difference between the measurement resources and UL resources meeting predetermined conditions. Reporting where only a part of the set of CSI values is calculated and the calculated CSI values are sent on the UL resource.

In some implementations, the predetermined condition may include that the time difference is less than a predefined CSI calculation time T1 based on a full CSI report in which the entire configured set of CSI values is calculated, and greater than a time based on the end of the measurement resources for the partial CSI report T2.

In some implementations, the operations may include performing full CSI reporting based on the time difference being greater than T2, wherein the entire set of CSI values is calculated and the calculated set of CSI values is transmitted on the UL resource.

In some implementations, the measurement resources may be no later than the UL resources.

In some implementations, the RRC configuration may include CSI configuration for partial CSI reporting.

In some implementations, with respect to operation, performing the partial CSI report may include sending additional information regarding the partial CSI report on an uplink resource.

The BS may perform operations regarding reception of CSI reports according to some implementations of the present disclosure. The BS may include: at least one transceiver; at least one processor; and at least one computer memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least A processor performs operations in accordance with some implementations of the present disclosure. Processing means for a BS may include: at least one processor; and at least one computer memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one A processor performs operations in accordance with some implementations of the present disclosure. A computer-readable (non-transitory) storage medium may store at least one computer program including instructions that, when executed by at least one processor, cause the at least one processor to perform operations in accordance with some implementations of the present disclosure. A computer program or computer program product may include instructions stored on at least one computer-readable (non-volatile) storage medium and which, when executed, cause (at least one processor) to perform operations in accordance with some implementations of the present disclosure . In the BS, the processing device, the computer-readable (non-transitory) storage medium and/or the computer program product, the operations may include: sending the RRC configuration related to the CSI report to the UE; sending trigger information to the UE, the trigger information triggering Reporting of the CSI value set configured by the RRC configuration; receiving trigger information that triggers reporting of the CSI value set configured by the RRC configuration; determining measurement resources for CSI reporting and CSI reporting based on the radio resource configuration and triggering information. UL resources; and receiving a partial CSI report based on the time difference between the measurement resource and the UL resource meeting a predetermined condition, wherein only a part of the CSI value set is received on the UL resource.

In some implementations, the predetermined condition may include that the time difference is less than a predefined CSI calculation time T1 based on a full CSI report in which the entire configured set of CSI values is calculated, and greater than a time based on the end of the measurement resources for the partial CSI report T2.

In some implementations, operations may include receiving a full CSI report based on a time difference greater than T2, wherein the entire set of CSI values is calculated and the calculated set of CSI values is received on the UL resource.

In some implementations, the measurement resources may be no later than the UL resources.

In some implementations, the RRC configuration may include CSI configuration for partial CSI reporting.

In some implementations, with regard to operations, performing partial CSI reporting may include receiving additional information regarding the partial CSI reporting on UL resources.

The examples of the disclosure described above have been presented to enable one of ordinary skill in the art to make and practice the disclosure. Although the present disclosure has been described with reference to examples, various modifications and changes in the examples of the disclosure may be made by those skilled in the art. Thus, the present disclosure is not intended to be limited to the examples set forth herein but is to be accorded the widest scope consistent with the principles and features disclosed herein.

Industrial applicability

Implementations of the present disclosure may be used in BSs, UEs, or other devices in wireless communication systems.

Claims (16)

1. A method of transmitting a Channel State Information (CSI) report by a User Equipment (UE) in a wireless communication system, the method comprising:

receiving a radio resource control configuration related to CSI reporting;

receiving trigger information that triggers reporting of a CSI value set configured by the radio resource control configuration;

determining measurement resources for the CSI report and uplink resources for the CSI report based on the radio resource configuration and the trigger information; and

based on a time difference between the measurement resources and the uplink resources satisfying a predetermined condition, partial CSI reporting is performed, wherein only a portion of the CSI value set is calculated and the calculated CSI value is transmitted on the uplink resources.

2. The method of claim 1, wherein the predetermined condition comprises:

the time difference is less than a CSI calculation time T1 predefined based on a complete CSI report in which the entire configured CSI value set is calculated, and is greater than a time T2 based on the end of measurement resources for the partial CSI report.

3. The method according to claim 2, comprising: based on the time difference being greater than T2, the full CSI report is performed, wherein the entire set of CSI values is calculated and the calculated set of CSI values is transmitted on the uplink resources.

4. The method of claim 1, wherein the measurement resources are no later than the uplink resources.

5. The method of claim 1, wherein the radio resource control configuration comprises a CSI configuration for the partial CSI report.

6. The method of claim 1, wherein performing the partial CSI report comprises: additional information about the partial CSI report is transmitted on the uplink resources.

7. A User Equipment (UE) configured to transmit Channel State Information (CSI) reports in a wireless communication system, the UE comprising:

at least one transceiver;

at least one processor; and

at least one computer memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations comprising:

Receiving a radio resource control configuration related to CSI reporting;

receiving trigger information that triggers reporting of a CSI value set configured by the radio resource control configuration;

determining measurement resources for the CSI report and uplink resources for the CSI report based on the radio resource configuration and the trigger information; and

based on a time difference between the measurement resources and the uplink resources satisfying a predetermined condition, partial CSI reporting is performed, wherein only a portion of the CSI value set is calculated and the calculated CSI value is transmitted on the uplink resources.

8. A processing apparatus in a wireless communication system, the processing apparatus comprising:

at least one processor; and

at least one computer memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations comprising:

receiving a radio resource control configuration related to a Channel State Information (CSI) report;

receiving trigger information that triggers reporting of a CSI value set configured by the radio resource control configuration;

Determining measurement resources for the CSI report and uplink resources for the CSI report based on the radio resource configuration and the trigger information; and

based on a time difference between the measurement resources and the uplink resources satisfying a predetermined condition, partial CSI reporting is performed, wherein only a portion of the CSI value set is calculated and the calculated CSI value is transmitted on the uplink resources.

9. A computer-readable storage medium configured to store at least one program code, the at least one program code comprising instructions that, when executed, cause at least one processor to perform operations comprising:

receiving a radio resource control configuration related to a Channel State Information (CSI) report;

receiving trigger information that triggers reporting of a CSI value set configured by the radio resource control configuration;

determining measurement resources for CSI reporting and uplink resources for the CSI reporting based on the radio resource configuration and the trigger information; and

based on a time difference between the measurement resources and the uplink resources satisfying a predetermined condition, partial CSI reporting is performed, wherein only a portion of the CSI value set is calculated and the calculated CSI value is transmitted on the uplink resources.

10. A method of receiving Channel State Information (CSI) reports by a Base Station (BS) in a wireless communication system, the method comprising:

transmitting a radio resource control configuration related to CSI reporting to a User Equipment (UE);

transmitting trigger information to the UE, the trigger information triggering reporting of a CSI value set configured by the radio resource control configuration;

receiving the trigger information, the trigger information triggering reporting of the CSI value set configured by the radio resource control configuration;

determining measurement resources for the CSI report and uplink resources for the CSI report based on the radio resource configuration and the trigger information; and

a partial CSI report is received based on a time difference between the measurement resources and the uplink resources satisfying a predetermined condition, wherein only a portion of the CSI value set is received on the uplink resources.

11. The method of claim 10, wherein the predetermined condition comprises:

the time difference is less than a CSI calculation time T1 predefined based on a complete CSI report in which the entire configured CSI value set is calculated, and is greater than a time T2 based on the end of measurement resources for the partial CSI report.

12. The method of claim 11, comprising:

based on the time difference being greater than T2, the full CSI report is received, wherein the entire set of CSI values is calculated and the calculated set of CSI values is received on the uplink resources.

13. The method of claim 10, wherein the measurement resources are no later than the uplink resources.

14. The method of claim 10, wherein the radio resource control configuration comprises a CSI configuration for the partial CSI report.

15. The method of claim 10, wherein receiving the partial CSI report comprises: additional information regarding the partial CSI report is received on the uplink resource.

16. A Base Station (BS) configured to receive Channel State Information (CSI) reports in a wireless communication system, the BS comprising:

at least one transceiver;

at least one processor; and

at least one computer memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations comprising:

Transmitting a radio resource control configuration related to CSI reporting to a User Equipment (UE);

transmitting trigger information to the UE, the trigger information triggering reporting of a CSI value set configured by the radio resource control configuration;

receiving trigger information that triggers reporting of the set of CSI values configured by the radio resource control configuration;

determining measurement resources for the CSI report and uplink resources for the CSI report based on the radio resource configuration and the trigger information; and

a partial CSI report is received based on a time difference between the measurement resources and the uplink resources satisfying a predetermined condition, wherein only a portion of the CSI value set is received on the uplink resources.