CN111149407A - Uplink resource configuration method and device in wireless communication system - Google Patents

Abstract

The present disclosure relates to a communication method and system for merging a fifth generation (5G) communication system for supporting higher data rates beyond fourth generation (4G) systems with internet of things (IoT) technology. The present disclosure may be applied to smart services based on 5G communication technologies and IoT related technologies, such as smart homes, smart buildings, smart cities, smart cars, networked cars, healthcare, digital education, smart retail, security, and security services. A method for transmitting uplink control information in a wireless communication system is provided. The method comprises the following steps: receiving configuration information on a plurality of bandwidth parts (BWPs) from a base station; receiving downlink control information and downlink data from a base station; receiving, from a base station, BWP adaptation information indicating a change in active BWP; identifying, in response to the downlink data, an uplink control channel resource for transmitting acknowledgement information; and transmitting acknowledgement information to the base station on the identified uplink control channel resource.

Description

Method and device for configuring uplink resources in wireless communication system

Technical Field

The present disclosure relates generally to wireless communication systems, and more particularly, to a method and apparatus for configuring uplink control channel transmission resources in a next generation mobile communication system.

Background

In order to meet the demand for wireless data services that have increased since the deployment of fourth generation (4G) communication systems, efforts have been made to develop improved fifth generation (5G) or quasi-5G communication systems. Accordingly, the 5G or quasi-5G communication system is also referred to as a "super 4G network" or a "post-LTE system". The 5G communication system is considered to be implemented in a higher frequency (millimeter wave) band (for example, 60GHz band) in order to achieve a higher data rate. In order to reduce propagation loss of radio waves and increase transmission distance, beamforming, massive multiple-input multiple-output (MIMO), Full-Dimensional multiple-input multiple-output (FD-MIMO), array antenna, analog beamforming, and massive antenna techniques are discussed in the 5G communication system. In addition, in the 5G communication system, development of improvement of a system Network is ongoing based on advanced small cells, a cloud Access Network (RAN), an ultra-dense Network, device-to-device (D2D) communication, a wireless backhaul, a mobile Network, cooperative communication, Coordinated Multi-Point (CoMP), receiver interference cancellation, and the like. In the 5G system, Hybrid FSK and QAM modulation (FQAM) and Sliding Window Superposition Coding (SWSC) as Advanced Coding Modulation (ACM), and Filter Bank Multi-Carrier (FBMC), Non-Orthogonal Multiple Access (NOMA) and Sparse Code Multiple Access (SCMA) as advanced Access technologies have been developed.

The Internet, which is a human-centric connected network of human-generated and consumed information, is now evolving into an Internet of things (IoT) network where distributed entities such as things exchange and process information without human intervention. Internet of Everything (IoE) has emerged as a combination of IoT technology and big data processing technology through connection with a cloud server. For IoT implementation, technical elements such as "sensing technology", "wired/wireless communication and network infrastructure", "service interface technology", and "security technology" are required, and sensor networks, Machine-to-Machine (M2M) communication, Machine-type communication (MTC), and the like have recently been studied. Such IoT environments can provide intelligent internet technology services that create new value for human life by collecting and analyzing data generated among interconnected things. Through the convergence and combination between existing Information Technology (IT) and various industrial applications, IoT may be applied to various fields including smart homes, smart buildings, smart cities, smart cars or networked cars, smart grids, healthcare, smart appliances, and advanced medical services.

Consistent with this, various attempts have been made to apply the 5G communication system to the IoT. For example, technologies such as sensor networks, Machine Type Communication (MTC), and machine-to-machine (M2M) communication may be implemented through beamforming, MIMIO, and array antennas. A cloud Radio Access Network (RAN), an application of the above-described big data processing technology, may also be considered as one example of the convergence between 5G technology and IoT technology.

Unlike the conventional communication system, a recently developed next-generation mobile communication system (hereinafter, interchangeably referred to as a 5G system) requires flexibility in time and frequency resource utilization. In particular, it is important to ensure flexibility in control channel design.

Disclosure of Invention

[ problem ] to provide a method for producing a semiconductor device

The present invention provides a method and apparatus for configuring uplink control channel transmission resources in a 5G system.

[ problem solution ] to provide a solution for the above problems

The present disclosure is made to solve the above-mentioned problems and disadvantages and to provide at least the advantages described below.

According to an aspect of the present disclosure, there is provided a method for transmitting uplink control information in a wireless communication system. The method comprises the following steps: receiving configuration information on a plurality of bandwidth parts from a base station; receiving configuration information on a plurality of bandwidth parts (bandwidth parts) from a base station; receiving downlink control information and downlink data from a base station; receiving, from a base station, BWP adaptation information indicating a change in active BWP; identifying uplink control channel resources for transmitting acknowledgement information in response to the downlink data; and transmitting acknowledgement information to the base station on the identified uplink control channel resource.

According to another aspect of the present disclosure, there is provided a method for receiving uplink control information in a wireless communication system, the method including transmitting configuration information regarding a plurality of bandwidth parts (BWPs) to a terminal; transmitting downlink control information and downlink data to the terminal; transmitting, to the terminal, BWP adaptation information indicating a change in active BWP; identifying uplink control channel resources for receiving acknowledgement information in response to the downlink data; and receiving acknowledgement information from the terminal on the identified uplink control channel resource.

According to another aspect of the present disclosure, there is provided a terminal for transmitting uplink control information in a wireless communication system. The terminal includes: a transceiver and a controller coupled to the transceiver. The controller is configured to: receiving configuration information on a plurality of bandwidth parts from a base station; receiving configuration information on a plurality of bandwidth parts (BWPs) from a base station; receiving downlink control information and downlink data from a base station; receiving, from a base station, BWP adaptation information indicating a change in active BWP; identifying uplink control channel resources for transmitting acknowledgement information in response to the downlink data; and transmitting acknowledgement information to the base station on the identified uplink control channel resource.

According to another aspect of the present disclosure, there is provided a base station for receiving uplink control information in a wireless communication system. The base station includes: a transceiver and a controller coupled to the transceiver. The controller is configured to: transmitting configuration information regarding a plurality of bandwidth parts (BWPs) to a terminal; transmitting downlink control information and downlink data to the terminal; transmitting, to the terminal, BWP adaptation information indicating a change in active BWP; identifying uplink control channel resources for receiving acknowledgement information in response to the downlink data; and receiving acknowledgement information from the terminal on the identified uplink control channel resource.

[ advantageous effects of the invention ]

As described above, the uplink resource configuration method and apparatus of the present invention are advantageous in facilitating the operation of a 5G system by making it possible to flexibly configure uplink control and data channel transmission resources.

Drawings

The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

fig. 1 is a diagram illustrating a basic time-frequency resource structure for transmitting downlink data and control channels in an LTE system;

fig. 2 is a diagram illustrating a Physical Downlink Control Channel (PDCCH) and an Enhanced PDCCH (EPDCCH) which are downlink physical channels carrying LTE Downlink Control Information (DCI);

fig. 3 is a diagram showing a basic unit of time and frequency resources of a downlink control channel in a 5G system;

fig. 4 is a diagram illustrating how a control resource set (CORESET) for transmitting a downlink control channel in a 5G wireless communication system is configured according to an embodiment;

fig. 5 is a diagram illustrating a Physical Uplink Control Channel (PUCCH) format used in a 5G wireless communication system according to an embodiment;

fig. 6 is a diagram illustrating a method for configuring a PUCCH format and a resource region in a 5G wireless communication system according to an embodiment;

fig. 7 is a diagram illustrating a transmission and reception bandwidth adaptation operation according to an embodiment;

fig. 8 is a diagram illustrating a transmission and reception bandwidth adaptation operation according to an embodiment;

fig. 9 is a diagram illustrating a transmission and reception bandwidth adaptation operation according to an embodiment;

fig. 10 is a diagram illustrating a transmission and reception bandwidth adaptation operation according to an embodiment;

fig. 11 is a flowchart illustrating a User Equipment (UE) operation according to an embodiment;

fig. 12 is a flowchart illustrating a UE operation according to an embodiment;

fig. 13 is a block diagram showing a configuration of a UE according to an embodiment; and

fig. 14 is a block diagram showing a configuration of a Base Station (BS) according to an embodiment.

Detailed Description

Various embodiments of the present disclosure are described with reference to the accompanying drawings. However, the various embodiments of the present disclosure are not limited to specific embodiments, and it should be understood that various modifications, equivalents, and/or substitutions may be made to the embodiments described herein.

Detailed descriptions of technical specifications well known in the art and directly unrelated to the present disclosure are omitted to avoid obscuring the subject matter of the present disclosure. Unnecessary description is omitted in order to make the subject matter of the present disclosure clear.

For the reasons stated above, some elements are enlarged, omitted or simplified in the drawings, and in practice, the elements may have different sizes and/or shapes from those shown in the drawings. Throughout the drawings, identical or equivalent parts are indicated by identical reference numerals.

It should be understood that the singular form of a noun corresponding to an item may include one or more things unless the relevant context clearly dictates otherwise. As used herein, each of these phrases, such as "a or B," "at least one of a and B," "at least one of a or B," "A, B or C," "at least one of A, B and C," and "at least one of A, B or C," may include any and all possible combinations of the items listed together in the respective one of the phrases. As used herein, terms such as "first" and "second," or "first" and "second," may be used to simply distinguish the respective component from another, and do not otherwise limit the components (e.g., importance or order). It will be understood that if an element (e.g., a first element) is referred to as being "coupled to," coupled to, "connected to," or "connected to" another element (e.g., a second element), whether or not the terms "operable" or "communicatively coupled to" the other element (e.g., the second element), this means that the element can be coupled to the other element directly (e.g., wirelessly), wirelessly, or via a third element.

Advantages and features of the present disclosure and methods of accomplishing the same may be understood more readily by reference to the following detailed description of embodiments and the accompanying drawings. This disclosure may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, the embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the disclosure to those skilled in the art, and the present disclosure will only be defined by the appended claims and their equivalents. Like reference numerals refer to like elements throughout the disclosure.

It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer program instructions may also be stored in a non-transitory computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the non-transitory computer-readable memory produce an article of manufacture including instruction means which implement the function/act specified in the flowchart and/or block diagram block or blocks. The computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.

Further, various block diagrams may illustrate modules, segments, or portions of code comprising at least one or more executable instructions for performing the certain logical function(s). Further, it should be noted that in several modifications, the functions of the blocks may be performed in a different order. For example, two blocks shown in succession may be executed substantially concurrently or the blocks may be executed in the reverse order, depending upon their functionality.

As used herein, the term "module" may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with other terms, such as "logic," logic block, "" portion, "or" circuitry. A module may be a single, integral component, or a minimal unit or portion thereof, adapted to perform one or more functions. For example, according to an embodiment, the module may be implemented in the form of an application-specific integrated circuit (ASIC). Thus, a module may include, for example, components such as software components, object-oriented software components, class components and task components, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functionality of the components and modules may be combined into fewer components and modules or further separated into more components and modules. Further, the components and modules may be implemented such that they run one or more Central Processing Units (CPUs) in a device or secure multimedia card.

According to an embodiment, a method according to various embodiments of the present disclosure may be included and provided in a computer program product. The computer program product may be used as a product for conducting transactions between sellers and buyers. The computer program product may be distributed in the form of a machine-readable storage medium, such as a compact disc read only memory (CD-ROM), or distributed online (e.g., downloaded or uploaded) via an application store (e.g., playstore), or distributed directly between two user devices (e.g., smartphones). If distributed online, at least a portion of the computer program product may be temporarily generated or at least temporarily stored in a machine-readable storage medium, such as a memory of a manufacturer server, a server of an application store, or a relay server.

According to various embodiments, each of the above-described components (e.g., modules or programs) may comprise a single entity or multiple entities. According to various embodiments, one or more of the above-described components may be omitted, or one or more other components may be added. Alternatively or additionally, multiple components (e.g., modules or programs) may be integrated into a single component. In such a case, according to various embodiments, the integrated components may still perform one or more functions of each of the multiple components in the same or similar manner as they were performed by the respective one of the multiple components prior to integration. Operations performed by a module, program, or another component may be performed sequentially, in parallel, repeatedly, or heuristically, or may be performed in a different order, or one or more of the operations omitted, or one or more other operations may be added, according to various embodiments.

Although the present description is directed to LTE and 5G systems, those skilled in the art will appreciate that the present disclosure may be applied to other communication systems with similar technical background and with slightly modified channel formats without departing from the spirit and scope of the present disclosure.

Mobile communication systems have evolved into high-speed, high-quality packet data communication systems such as high-speed packet access (HSPA), LTE (or evolved universal terrestrial radio access (E-UTRA)) and LTE-advanced (LTE-advanced) defined in the third Generation partnership project (3 GPP), as well as the high-speed packet data (HRPD) defined in the third Generation partnership project 2(3GPP2), and the Institute of Electrical and Electronics Engineers (IEEE) standard 802.16E capable of providing data and multimedia services beyond early voice-oriented services.

As one of representative broadband wireless communication systems, the LTE system uses Orthogonal Frequency Division Multiplexing (OFDM) in a downlink and single carrier frequency division multiple access (SC-FDMA) in an uplink. The term "uplink" (UL) denotes a radio transmission path from a terminal (which may be interchangeably referred to as UE and Mobile Station (MS)) to a BS (which may be interchangeably referred to as evolved node b (enb)). The term "downlink" (DL) denotes a radio transmission path from the BS to the terminal. Such multiple access schemes (multiple access schemes) are characterized in that time-frequency resources for transmitting user-specific data and control information are allocated without overlapping each other (i.e., maintaining orthogonality) in order to distinguish among the user-specific data and control information.

As a next-generation communication system following LTE, a 5G communication system should be designed to meet the requirements of various services required by users and service providers. Services supported by the 5G system may be classified into three categories, enhanced mobile broadband (eMBB), large machine type communication (mtc), and ultra-reliable and low-latency communication (URLLC).

The eMBBs are targeted to provide exceptionally high data rates compared to the data rates supported by legacy LTE, LTE-A, and LTE-A Pro. For example, the aim of the eMBB is to increase the peak data rate per base station to 20 gbits/sec in DL and 10 gbits/sec in UL. Meanwhile, the eMBB aims to improve the user-perceived data rate. In order to meet these requirements, it is necessary to improve signal transmission/reception techniques including MIMO techniques. The data rate requirements for a 5G communication system can be met by using a frequency bandwidth wider than 20MHz in the frequency band of 3 to 6GHz or higher than 6GHz, instead of the current LTE frequency band of 2 GHz.

Furthermore, mtc is considered to support IoT application services. In order to effectively provide the mtc-based IoT application service, it is necessary to ensure massive access resources of terminals within a cell, improve terminal coverage and battery life, and reduce device manufacturing costs. Given the nature of IoT terminals attached to various sensors and devices to provide communication functions, IoT services should be designed to support a large number of terminals within a cell (e.g., 1000000 terminals/km 2). Depending on the nature of the IoT service, the mtc terminal is likely to be located in a coverage hole (coverage hole), such as the basement of a building, which requires wider coverage than other services supported in the 5G communication system. Mtc terminals characterized by low price and difficulty in battery replacement should be designed to have very long battery life.

Finally, URLLC is directed to mission critical cellular-based communication services such as telerobotic and mechanical control, industrial automation, unmanned aerial vehicles, telemedicine, and emergency alert services requiring ultra-low latency and ultra-high reliability. Therefore, URLLC service requires ultra-low latency and ultra-high reliability. For example, URLLC services must meet the requirements that air interface delay is below 0.5 milliseconds and packet error rate is less than or equal to 10-5. In this regard, in order to support the URLLC service, the 5G system must support a shorter Transmission Time Interval (TTI) than that of other services and allocate a wide range of resources in a frequency band. Therefore, 5G systems must support a short TTI for URLLC that is smaller than the TTI for other services, and allocate wide resources within the frequency band to ensure reliability of the communication link.

Three classes of services (i.e., eMBB, URLLC, and mtc) may be multiplexed into one system. Different transmission/reception schemes and parameters may be used to transmit/receive different classes of services in order to meet different service specific requirements.

A description of frame structures for LTE and LTE-a systems is provided below with reference to the accompanying drawings.

Fig. 1 is a diagram illustrating a basic time-frequency resource structure for transmitting DL data and control channels in an LTE system.

Referring to fig. 1, the horizontal axis represents time, and the vertical axis represents frequency. The smallest transmission unit in the time domain is an OFDM symbol, and N_symbThe OFDM symbols 101 form a slot 102, and 2 slots form a subframe 103. Each slot spans (span)0.5 ms, and each subframe spans 1.0 ms. The radio frame 104 is a time unit composed of 10 subframes. In the frequency domain, the smallest transmission unit is a subcarrier, and the total system transmission bandwidth is composed of NBW subcarriers 105. In the time-frequency resource structure, a basic resource element is a Resource Element (RE) 106 indicated by an OFDM symbol index and a subcarrier index. Resource Block (RB) (or Physical Resource Block (PRB)) 107 is formed by N in the time domain_symbA number of consecutive OFDM symbols 101 and N in the frequency domain_RBA number of consecutive subcarriers 108. That is, one RB 107 is formed by N_symbx N_RBAnd RE 106. Generally, an RB is the smallest data transmission unit. In LTE system, N_symb＝7，N_RB12 and NBW is proportional to the system transmission bandwidth。

Next, a description is provided of DCI for LTE and LTE-a systems.

In the LTE system, DL or UL data scheduling information is transmitted from an eNB to a UE using DCI. Depending on the purpose, the DCI is classified into different DCI formats (e.g., indicating UL grant for UL data scheduling or DL grant for DL data scheduling, indicating the use of control information of a small size, indicating whether multi-antenna based spatial multiplexing is applied, and indicating the use of power control). For example, DCI format 1 for DL grant is configured to include at least the following information.

Resource allocation type 0/1 flag resource allocation type 0/1 flag indicates whether the resource allocation scheme is type 0 or type 1. Type 0 is used to allocate resources in RBG units by applying a bitmap scheme. In the LTE system, the scheduled basic unit may be an RB expressed by time-frequency domain resources, and the RBG may include a plurality of RBs and may be a scheduled basic unit in a type 0 scheme. Type 1 is used to allocate a specific RB in the RBG.

Resource block allocation indicates the RBs allocated for data transmission. The resources may be determined depending on the system bandwidth and the resource allocation scheme.

A Modulation and Coding Scheme (MCS) indicating the Modulation scheme used for data transmission and the size of the transport block to be transmitted.

Hybrid automatic repeat request (HARQ) process number HARQ process number indicates the process number of HARQ.

New data indicator indicates whether the HARQ transmission is an initial transmission or a retransmission.

Redundancy version the redundancy version indicates the redundancy version of the HARQ.

Transmit Power Control (TPC) command of PUCCH the TPC command of PUCCH indicates a power control command of PUCCH which is a UL control channel.

After undergoing a channel coding and modulation process, DCI may be transmitted through PDCCH or EPDCCH.

A Cyclic Redundancy Check (CRC) is attached to the DCI message payload and scrambled with a Radio Network Temporary Identifier (RNTI) of the UE. For DCI messages (e.g., UE-specific data transmissions, power control commands, and random access responses), there are different types of RNTIs. That is, the RNTI is not explicitly transmitted but is included during the CRC calculation process. When receiving a DCI message on a PDCCH, the UE performs a CRC check with the allocated RNTI, and determines that the message is addressed to itself if the CRC check is successful.

Fig. 2 is a diagram showing PDCCH and EPDCCH as DL physical channels carrying LTE DCI.

Referring to fig. 2, a PDCCH201 is time-division-multiplexed (TDM) with a Physical Downlink Shared Channel (PDSCH) 203 as a data channel and is distributed across the entire system bandwidth. The control region for transmitting the PDCCH201 may be expressed by a plurality of OFDM symbols, which are indicated by a Control Format Indicator (CFI) transmitted to the UE in a Physical Control Format Indicator Channel (PCFICH). PDCCH201 is mapped to several OFDM symbols at the beginning of a subframe, so that the UE rapidly decodes DL scheduling information for decoding a DL shared channel (DL shared channel) without delay, so that DL transmission delay reduction is facilitated. Assuming that a PDCCH transmits one DCI message, when a plurality of UEs are scheduled in DL and UL, it may occur that the PDCCH of a plurality of UEs is transmitted per cell.

A cell-specific reference signal (CRS) 204 is used as a reference signal for decoding the PDCCH 201. CRS 204 are distributed across the entire system bandwidth and are transmitted with different scrambling and resource mapping determined from the cell Identifier (ID) in each subframe. CRS 204 cannot be beamformed in a UE-specific manner because it is a common reference signal used by all UEs located within the cell. Therefore, multi-antenna transmission of LTE PDCCH is limited to open loop transmit diversity. The number of CRS ports is implicitly informed to the UE via Physical Broadcast Channel (PBCH) decoding.

Resource allocation of the PDCCH201 is performed based on a control-channel element (CCE), and one CCE is composed of 9 Resource Element Groups (REGs), i.e., 36 Resource Elements (REs). PDCCH201 may be transmitted over 1, 2, 4, or 8 CCEs, and the number of CCEs depends on the channel coding rate of the DCI message payload. The reason for using different numbers of CCEs is to achieve link adaptation of PDCCH 201.

The UE must detect PDCCH201 by blind decoding within a search space, which is a set of CCEs, without information related thereto. The search space is a set of CCEs consisting of Aggregation Levels (ALs) that are implicitly determined based on a function of UE identity and subframe number, rather than explicitly signaled. The UE performs blind decoding on all possible resource candidates available for CCEs within the search space to decode PDCCH201 and information verified as valid for the UE through the CRC test process.

There are two types of search spaces, UE-specific search space and common search space. A group of UEs or all UEs may monitor the common search space of PDCCH201 to receive cell-specific control information, such as system information and dynamic scheduling of paging messages. For example, DL-SCH scheduling assignment information for transmitting a system information block-1 (SIB-1) including operator information of a cell may be received by decoding a common search space of the PDCCH 201.

As shown in fig. 2, EPDCCH202 is multiplexed in frequency with PDSCH 203. The base station may appropriately allocate resources for EPDCCH202 and PDSCH 203 through scheduling to efficiently support coexistence with data transmission to legacy LTE UEs. However, a problem arises in that EPDCCH202 spanning one subframe causes transmission delay.

Multiple EPDCCHs 202 may constitute an EPDCCH set, for which resources are allocated over PRB-pairs. The EPDCCH set position is configured in a UE-specific manner and EPDCCH set position information is sent via Radio Resource Control (RRC) signaling. A UE may be allocated a maximum of two EPDCCH sets, and one EPDCCH set may be multiplexed with EPDCCH sets of other UEs.

The resource allocation for EPDCCH202 is performed based on enhanced CCEs (ECCEs), where one ECCE consists of 4 or 8 Enhanced REGs (EREGs), and the number of EREGs per ECCE is determined depending on a Cyclic Prefix (CP) length and subframe configuration information. One EREG consists of 9 REs and there may be up to 16 EREGs per PRB pair. There are two different ways of transmitting EPDCCH202, both "localized" and "distributed", depending on the EREG to RE mapping scheme. There are 6 possible ECCE aggregation levels 1, 2, 4, 8, 16 and 32, one of which is selected based on CP length, subframe configuration, EPDCCH format and transmission scheme.

EPDCCH202 is only transmitted in the UE-specific search space. Therefore, the UE must monitor the common search space of PDCCH201 to receive system information.

The EPDCCH202 carries a demodulation reference signal (DMRS) 205. The eNB may perform precoding on EPDCCH202 and use UE-specific beamforming. The UE may decode the EPDCCH202 without knowledge of precoding used for the EPDCCH 202. The EPDCCH202 is configured with the same DMRS pattern as used for the PDSCH 203. However, unlike PDSCH 203, DMRS 205 may support up to 4 antenna ports in EPDCCH 202. The DMRS 205 may be transmitted only in the PRB to which the EPDCCH202 is mapped.

The port configuration information of the DMRS 205 differs depending on the EPDCCH transmission mode. In the local transmission mode, the antenna port corresponding to the ECCE to which EPDCCH202 is mapped is selected based on the UE ID. In case multiple UEs share the same ECCE (i.e., multi-user MIMO is used for transmission), corresponding UEs may be allocated for DMRS antenna ports. The DMRS 205 may also be transmitted in a shared manner, and in this case, the UE may be distinguished using a DMRS scrambling sequence configured by higher layer signaling. In a distributed transmission mode, up to two antenna ports may be supported for DMRS 205 and a precoder cycling based diversity scheme. DMRSs 205 mapped to REs within the same PRB pair may be shared.

In the above, the DL control channel transmission method and the RS for decoding the DL control channel in the conventional LTE and LTE-a have been described.

Hereinafter, the DL control channel for 5G communication currently discussed is described with reference to the drawings.

Fig. 3 is a diagram illustrating a basic unit of time and frequency resources of a DL control channel in a 5G system.

Referring to fig. 3, an REG, which is a basic unit of time and frequency resources of a control channel, is composed of one OFDM symbol 301 in the time domain and 12 subcarriers 302 (i.e., one RB) in the frequency domain. Data and control channels can be multiplexed in one subframe by assuming one OFDM symbol as a basic unit of control channel resources in the time domain. The control channel is followed by a data channel to reduce processing time at the UE to help meet delay requirements. Multiplexing control and data channels in frequency may be facilitated by using 1 RB 302 as a basic unit of control channel resources in the frequency domain.

By connecting a plurality of NR-REGs 303, various control channel regions of different sizes can be configured. For example, assuming that in 5G, the basic unit of DL control channel resource allocation is NR-CCE304, NR-CCE304 may be composed of a plurality of NR-REGs 303. For example, the NR-REGs 303 depicted in fig. 3 are composed of 12 REs, and assuming that one NR-CCE304 is composed of 4 NR-REGs 303, the NR-CCE304 is composed of 48 REs. If a DL control region is configured, the control region may consist of multiple NR-CCEs 304 and a certain DL control channel may be mapped to one or more NR-CCEs 304 according to the AL in the control region. The NR-CCEs 304 constituting the control region are distinguished by CCE numbers assigned in a logical mapping manner.

A basic unit of DL control channel resources (i.e., NR-REG 303) may include REs to which DCI is mapped and REs to which DMRS 305, which is a reference signal for decoding DCI, is mapped. Here, the DMRS 305 may be mapped based on overhead caused by RS resource allocation so as to be efficiently transmitted. For example, if a DL control channel is transmitted over a plurality of OFDM symbols, the DMRS 305 may be mapped to only the first OFDM symbol.

The DMRS 305 may be mapped based on the number of antenna ports for transmitting the DL control channel. Fig. 3 depicts the case where two antenna ports are used. The DMRS 306 for antenna port #0 and the DMRS 307 for antenna port #1 may be transmitted separately. DMRSs for different antenna ports may be multiplexed in various ways. Fig. 3 depicts a case where DMRSs for different antenna ports are mapped to different REs to maintain orthogonality. The DMRS may be frequency-division-multiplexed (FDM) or code-division-multiplexed (CDM) as shown in fig. 3. DMRSs may be configured in various DMRS patterns associated with the number of antenna ports.

Fig. 4 is a diagram for explaining CORESET for transmitting a DL control channel in a 5G wireless communication system according to an embodiment.

Referring to fig. 4, a resource grid is provided that spans the system bandwidth 410 in the frequency domain and spans one slot 420 in the time domain. Although fig. 4 is directed to the case where one slot is composed of seven OFDM symbols, the method of the present disclosure is also applicable to the case where one slot is composed of fourteen OFDM symbols. In FIG. 4, system bandwidth 410 may include one or more BWPs and is divided into 4 BWPs, BWP #1402, BWP #2403, BWP # 3404, and BWP # 4405. At least two of the BWPs may be merged into another BWP, such as BWP # 5406.

In fig. 4, two CORESET (CORESET #1440 and CORESET #2450) are configured. CORESET 440 and 450 may be configured to occupy specific sub-bands across the entire system bandwidth 410. In fig. 4, CORESET #1440 is configured across two BWPs (i.e., BWP #1402 and BWP #2403), and CORESET #2 is configured with one BWP (i.e., BWP # 4405). CORESET may span one or more OFDM symbols in the time domain and its length is specified by a number of OFDM symbols, as represented by reference numerals 460 and 470. In fig. 4, the CORESET length 460 of CORESET #1 is 2, and the CORESET length 470 of CORESET #2 is 1.

In a 5G system, multiple CORESET may be configured from the BS. A plurality of CORESET may also be configured according to a terminal (hereinafter, interchangeably referred to as UE). The parts of CORESET configured in the system may also be distributed. Therefore, the UE may not be aware of all CORESET configurations in the system. As shown in fig. 4, assuming that two CORESET (CORESET #1440 and CORESET #2450) can be configured in the system, CORESET #1440 may be configured for UE #1, and CORESET #1440 and CORESET #2 may be configured for UE # 2. In this case, UE #1 may not know the presence of CORESET #2450 unless an additional indicator is used.

In 5G, the core set may be configured as one of a common core set, a UE group common core set, and a UE specific core set. The CORESET may be configured for each UE via UE-specific signaling, UE group common signaling, or RRC signaling. If CORESET is configured to the UE, this means that information about CORESET location, CORESET sub-bands, CORESET resource allocation and CORESET length is provided to the UE. The CORESET configuration information provided to the UE may include the following information as shown in table 1 below.

[ TABLE 1 ]

The CORESET configuration information may include other information required for transmitting the DL control channel in addition to the above information.

Fig. 5 is a diagram illustrating a PUCCH format used in a 5G wireless communication system according to an embodiment.

Although fig. 5 is directed to the case where the UE determines a transmission period (or start and end symbol positions, or a start symbol position and the number of symbols for transmission) of the long PUCCH for transmitting the PUCCH on a slot basis, the UE may also determine a transmission period of the long PUCCH for transmitting the PUCCH on a mini-slot basis (consisting of symbols less than one slot). In the present disclosure, a PUCCH having a short transmission period (e.g., one or two symbols) for minimizing a transmission delay is referred to as a short PUCCH, and a PUCCH having a long transmission period (e.g., 4 or more symbols) for ensuring sufficient cell coverage is referred to as a long PUCCH.

In fig. 5, the long PUCCH and the short PUCCH are FDM as denoted by reference numeral 500, and the long PUCCH and the short PUCCH are TDM as denoted by reference numeral 501. A description of a slot format for multiplexing a long PUCCH and a short PUCCH is provided. Although described with a slot as a basic unit of signal transmission, different units such as a subframe and a TTI may be used.

In fig. 5, reference numerals 530 and 531 denote slots, each of which is mainly composed of UL symbols (i.e., a slot centered on UL). The UL-centric slot consists mainly of UL OFDM symbols. The OFDM symbols constituting one UL-centric slot may be all UL OFDM symbols, or mainly UL OFDM symbols and several DL OFDM symbols located at the beginning or end of the slot with a guard interval (or gap) between the DL and UL OFDM symbols. In fig. 5, the UL-centered slot includes one DL OFDM symbol (i.e., the first OFDM symbol) and a plurality of UL OFDM symbols (i.e., the third to the last OFDM symbols). The second OFDM symbol is used as a guard interval. During a period corresponding to an UL OFDM symbol, uplink transmission (UL) data channel transmission as well as uplink transmission (UL) control channel transmission may be performed.

The long PUCCH503 may be a long control channel transmitted in a discrete fourier transform spread OFDM (DFT-S-OFDM) scheme as a single carrier transmission scheme rather than an OFDM transmission scheme because the long control channel is used to extend cell coverage. Therefore, it is necessary to transmit the control channel on consecutive subcarriers, and in order to achieve the frequency diversity effect, the long PUCCH503 should be arranged at discrete positions denoted by reference numerals 508 and 509. The frequency distance 505 should be less than or equal to the UL bandwidth supported by or configured to the UE, which performs long PUCCH503 transmission in PRB-1 at the beginning of the slot as denoted by reference numeral 508 and PRB-2 at the end of the slot as denoted by reference numeral 509. The PRB is the smallest transmission unit in the frequency domain and is composed of 12 subcarriers. Therefore, the distance between PRB-1 and PRB-2 should be less than or equal to the maximum supportable bandwidth of the UE or UL transmission bandwidth configured to the UE, and the maximum supportable bandwidth of the UE may be less than or equal to the bandwidth 506 supported by the system.

The frequency resources PRB-1 and PRB-2 may be configured to the UE such that the frequency resources are mapped to corresponding bit fields via higher layer signaling and the frequency resources to be used by the UE are informed using the bit fields included in the DL control channel. Both the control channel transmitted at the beginning of the slot, denoted by reference numeral 508, and the control channel transmitted at the end of the slot, denoted by reference numeral 509, include UL Control Information (UCI) 510 and UE-specific reference signal 511, and it is assumed that the two signals are distinguished from each other in appearance and transmitted in different OFDM symbols.

The short PUCCH518 may be transmitted in any one of a DL-centric slot and an UL-centric slot, particularly the last symbol or OFDM symbol at the end of the slot (e.g., the last OFDM symbol, the second to last OFDM symbol, or the last two OFDM symbols). It is also possible to transmit the short PUCCH518 anywhere in the slot. The short PUCCH518 may be mapped to one or more OFDM symbols. For example, in fig. 5, the short PUCCH518 is mapped to the last symbol of the slot.

The radio resources of the short PUCCH518 are allocated by PRBs such that the PUCCH is mapped to a plurality of PRBs that are continuous or discrete in the frequency domain. The allocated PRBs should be included in a frequency band equal to or narrower than a frequency band 507 supported by the UE or an UL transmission bandwidth that the BS has configured to the UE. The frequency resources configured to the UE may be allocated to the plurality of PRBs via higher layer signaling such that the frequency resources are mapped to corresponding bit fields, and the plurality of PRBs may inform the UE of the frequency resources to be used via the bit fields included in the DL control channel.

The UCI520 and the DMRS 521 are frequency-multiplexed on a PRB such that the DMRS 521 is transmitted on one subcarrier every two subcarriers as denoted by reference numeral 512, one subcarrier every three subcarriers as denoted by reference numeral 513, or one subcarrier every four subcarriers as denoted by reference numeral 514. One of the DMRS 521 transmission schemes 512, 513, and 514 may be configured via higher layer signaling. The UE may transmit DMRS 521 and DCI multiplexed as indicated via higher layer signaling.

The DMRS transmission scheme may also be determined based on the number of bits of UCI 520. If the number of bits of the UCI520 is small, the UE may multiplex the DMRS 521 and the UCI520 into a control channel as denoted by reference numeral 512. In case that the number of bits of the UCI is small, the transmission coding rate may be achieved with reduced resources sufficient for UCI520 transmission. If the number of bits of the UCI520 is large, the UE may multiplex the DMRS 521 and the UCI520 into a control channel as denoted by reference numeral 514. In case that the number of bits of the UCI520 is large, it is necessary to use a large amount of resources for UCI520 transmission at a reduced transmission coding rate.

Based on information indicating use of the long PUCCH or the short PUCCH received from the BS via higher layer signaling, the UE may determine to transmit UCI520 using the long PUCCH503 or the short PUCCH518 in a slot or a mini-slot. Such a determination may also be made based on information received from the BS via physical layer signaling indicating use of the long PUCCH or the short PUCCH. Such a determination may also be made based on information implicitly obtained from the number of UL symbols of the slot or mini-slot. For example, the UE may transmit UCI520 using the short PUCCH518 for the case where the number of UL symbols included in a slot or a mini-slot, which is notified or configured by the BS for UCI520 transmission, is 1 or 2, and may transmit UCI520 using the long PUCCH503 for the case where the number of UL symbols included in a slot or a mini-slot is 4 to 14.

Based on information indicating a waveform of message 3(msg3) included in message 2(msg2) transmitted in a random access procedure, the UE may also determine whether to transmit UCI520 in a slot or a micro-slot using long PUCCH503 or short PUCCH 518. That is, if information indicating a waveform of msg3 included in msg2 is set to CP-OFMD, the UE transmits UCI520 with a short PUCCH518 using a CP-OFDM waveform. If information indicating a waveform of msg3 included in msg2 is set to DFT-S-OFDM, the UE transmits UCI520 with a long PUCCH503 using a DFT-S-OFDM waveform.

Next, an example of multiplexing the above-described long PUCCH and short PUCCH is provided. The long PUCCH and the short PUCCH of different UEs may be frequency multiplexed into one slot 530, as denoted by reference numeral 500. In this case, as shown in fig. 5, the BS may configure short PUCCH and long PUCCH frequency resources that do not overlap in one PRB. However, if configuring different PUCCH transmission resources for all individual UEs results in frequency resources being wasted and limited, the frequency resources need to be allocated in large amounts for UL data channel transmission, not UL control channel transmission. Accordingly, short and long PUCCH resources allocated to different UEs may overlap, and the BS may prevent scheduled resources and UE-specific transmission resources from colliding with each other in one slot. However, for a case where it is impossible to avoid collision between the short PUCCH transmission resource and the long PUCCH transmission resource, a method is required that enables the BS to configure the long transmission resource and the short transmission resource so that they do not collide and enables the UE to adjust the long PUCCH503 transmission resource according to an instruction from the BS. According to one approach, the short PUCCH and long PUCCH transmission resources may be time division multiplexed in one slot 531.

In order to support various types of services in a 5G wireless communication system, it is necessary to design the system based on forward compatibility so that future services are not limited by the current system. This means that 5G systems should be designed such that time and frequency resources are utilized more flexibly than conventional LTE systems. In particular, one of the most important design issues is to ensure flexibility of the control channel. To achieve this, it may be desirable to transmit the DL control channel in a particular sub-band rather than across the entire system band, and to allocate time and frequency resources for DL control channel transmission in a UE-specific manner.

In the 5G system, it is being considered to transmit and receive signals in an ultra wide bandwidth of several tens or hundreds MHz or a small number GHz to support an ultra high speed data service requiring a data rate of several Gbps. However, considering that power consumption increases in proportion to the transmission/reception bandwidth, it is necessary to efficiently manage power consumption of the UE and the BS by adapting the transmission/reception bandwidth to the situation. Controlling power consumption is more important in battery-powered UEs than in BSs connected to a constant power supply. Therefore, when the UE does not require ultra-high bandwidth signal transmission/reception, BS handover can be considered and the transmission/reception band of the UE is switched to a narrow band to reduce power consumption.

For transmission/reception bandwidth adaptation or handover, it is necessary for the BS to efficiently configure CORESET to the UE to efficiently transmit DL control channels and resources, and PUCCH. In case of allocating UL bandwidth and DL bandwidth in different BWPs for a UE, a method is needed that enables the UE to configure PUCCH resources, select PUCCH resources, and switch between BWPs in a BWP-specific manner.

Fig. 6 is a diagram illustrating a method for configuring a PUCCH format and a resource region in a 5G wireless communication system according to an embodiment.

Fig. 6 depicts a resource grid spanning the UL system bandwidth 610 in the frequency domain and one slot 620 in the time domain. Although fig. 6 is directed to the case where one slot is composed of seven OFDM symbols, the method of the present disclosure is also applicable to the case where one slot is composed of fourteen OFDM symbols. In fig. 6, UL system bandwidth 610 may be composed of one or more UL BWPs, and UL system bandwidth 610 is divided into 4 BWPs BWP # 1602, BWP # 2603, BWP #3604, and BWP # 4605. At least two of the BWPs may be combined into another BWP, such as BWP # 5606. The UE may activate one or more BWPs for a certain time period (symbol, slot, subframe, or frame). BWP may be activated or deactivated via at least one of higher layer signaling, DCI transmitted in a DL control channel, MAC CE, and a BWP activation/deactivation timer.

Here, the PUCCH transmission resource may be configured for all, one, or some of BWP. PUCCH transmission resources may be configured for each UE via UE-specific signaling, UE group common signaling, or RRC signaling. If the PUCCH transmission resource is configured to the UE, information such as a control channel transmission region location, a control channel sub-band, a control channel resource allocation, and a control channel length is provided to the UE. The PUCCH configuration information may include at least the following information, as shown in table 2 below.

[ TABLE 2 ]

A more detailed description is made with reference to parts (a) and (b) of fig. 6. A UE configured with multiple BWPs as shown in part (a) of fig. 6 may be allocated multiple long PUCCH transmission resources 640 in one of the configured BWPs. It is also possible that, as shown in part (b) of fig. 6, in one of the configured BWPs, each of PUCCH transmission resources 650, 660, 670 and 680 is allocated to the UE, respectively. It is also possible to allocate PUCCH transmission resources for the UE in some of the configured BWPs. Here, PUCCH transmission resources may be independently configured per BWP.

The BS may configure PUCCH transmission resources based on the maximum frequency bandwidth supported by the UE regardless of BWP. For example, the BS may configure PUCCH transmission resources 650 and 680 based on the maximum UL frequency bandwidth 610 of the UE. In this case, based on the PUCCH transmission resource and UL bandwidth configured by the BS, the UE may employ the long PUCCH 650 in BWP # 1602, the short PUCCH 680 in BWP #4, and no PUCCH in BWP # 2603 and BWP # 3604. Although each BWP is configured to have one type of PUCCH or not as shown in fig. 6, each BWP may be configured to have one or more types of PUCCH.

At least one information element included in the PUCCH configuration information listed in table 2 may be predefined between the BS and the UE or configured via higher layer signaling or system information (e.g., a signal transmitted together with the SI-RNTI signal) from the BS to the UE. The BS may transmit PUCCH configuration information to the UE via higher layer signaling for UL BWP configuration. In case of configuring a maximum UL bandwidth supported by the UE and PUCCH transmission resources in at least one BWP, the BS may select one of a plurality of control channel transmission resources (or PUCCH format indexes or PUCCH formats) and transmit the selected control channel transmission resource information to the UE via the DL control channel. In this case, the UE may receive a DL data channel based on DCI received on a DL control channel and transmit an acknowledgement corresponding to the DL data channel to the BS on a control channel resource indicated via the DCI.

If the UE needs to transmit the PUCCH, the UE may activate one of the deactivated BWPs (e.g., one of the deactivated BWPs (BWP # 1602) in case the activated BWP (BWP # 2603) has no configured PUCCH resource) to transmit the PUCCH. If the UE is only able to activate one UL BWP, it may assume that the activated BWP (BWP # 2603) without the currently configured PUCCH resource is deactivated and BWP (BWP # 1602) is activated for PUCCH transmission. After transmitting PUCCH, the UE may reactivate BWP # 2603 and deactivate BWP # 1602.

In the case where UL transmission (e.g., SRS transmission) is scheduled in BWP # 2603 or another BWP (e.g., BWP # 3604) during the slot in which BWP # 1602 is activated for PUCCH transmission, UL transmission scheduled in BWPs other than BWP #1 activated for PUCCH transmission may be skipped. At this time, the UE considers whether the PUCCH transmission timing in BWP # 1602 and the UL signal transmission timing scheduled in BWP #3603 overlap (e.g., at symbol or slot level), whether BWP handover can be performed, and whether UL transmission scheduled in BWP #3604 can be performed after PUCCH is transmitted in BWP # 1. That is, if UL transmission can be performed in BWP #3604 at a timing (e.g., a symbol or slot) after a period X from the start of PUCCH transmission in BWP #1, the UE can activate BWP #3604 to transmit UL transmission scheduled in BWP #3604 after the PUCCH transmission in BWP # 1.

In case that the UE needs to transmit the UL signal on the PUCCH, a case may be considered in which there are a plurality of deactivated BWPs having configured PUCCH resources even though the currently activated BWP has no configured PUCCH resource, and a plurality of BWPs are activated or all or some of the continuously activated BWPs have configured PUCCH resources. In this case, the UE may transmit the PUCCH on a PUCCH resource configured in a predefined or preconfigured BWP or on a PUCCH resource configured in a BWP having the lowest BWP index among activated BWPs having the configured PUCCH resource. The UE may also transmit the PUCCH on a PUCCH resource configured in the UL BWP related to a DL BWP on which the DL data channel is received among the active BWPs having the configured PUCCH resource, or on a PUCCH or UL data channel configured in the UL BWP in which another UL signal transmission (instead of the PUCCH transmission) is scheduled. The UE may also transmit a PUCCH on a PUCCH resource configured in a most recently activated UL BWP, and if the PUCCH carries Scheduling Request (SR) information, transmit the PUCCH on the PUCCH resource configured in the UL BWP in which a resource used by the UE in transmitting the SR is configured.

Hereinafter, a bandwidth adaptation method of the 5G communication system is described.

Fig. 7 is a diagram illustrating a transmission/reception bandwidth adaptation operation according to an embodiment. The bandwidth adaptation method makes it possible to efficiently manage power consumption of the UE.

Referring to fig. 7, the x-axis is time and the y-axis is frequency. Referring to part (a) of fig. 7 for explaining the DL bandwidth adaptation operation, the UE receives a DL control channel and a DL data channel corresponding to a bandwidth a701 from the BS in a slot # 1706. The bandwidth a701 may be a predetermined reference bandwidth, a bandwidth determined during initial access of the UE, or a bandwidth or BWP determined through configuration signaling between the UE and the BS.

If the BS transmits a bandwidth adaptation indicator 702 to the UE to switch the bandwidth using the bandwidth B705, the UE performs a bandwidth adaptation operation based on the command. Bandwidth a and bandwidth B may differ in size (i.e., bandwidth a may be wider or narrower than bandwidth B). In fig. 7, it is assumed that the bandwidth B is wider than the bandwidth a. Each of the bandwidth a and the bandwidth B may be expressed by the number of PRBs or BWPs.

The UE needs a certain amount of time to successfully perform decoding to obtain the bandwidth adaptation indicator and configure a Radio Frequency (RF) module of the UE for bandwidth switching. In fig. 7, the UE spends bandwidth transition time X to receive the bandwidth adaptation indicator and complete the bandwidth switching based on the command. The bandwidth adaptation indicator 702 may be carried in the DL control channel 717 that is transmitted to the UE, and the UE does not receive any other DL signals nor transmit any UL signals during the bandwidth transition time X703.

The UE completes the bandwidth switch within bandwidth transition time X and operates with slot # 3708 in bandwidth B. Accordingly, the BS can transmit a signal to the UE in the bandwidth B from the slot # 3708. In fig. 7, the BS can transmit a DL control channel and a DL data channel corresponding to a bandwidth B in a slot # 3708 and a slot # 4709.

The bandwidth adaptation indicator 702 has a bit width of 1 to N (N > 1).

Bandwidth adaptation indicator configuration scheme 1(1 bit). if there are two bandwidths available to the UE (e.g., bandwidth a and bandwidth B), the bandwidth of the UE may be indicated using a 1 bit indicator. For example, for bandwidth a, a 1-bit indicator may be set to 0; or for bandwidth B, the 1-bit indicator may be set to 1.

Bandwidth adaptation indicator configuration scheme 2(N bits) one of the 2N bandwidths available to the UE may be indicated with an N-bit indicator. For example, for bandwidth a, the 2-bit indicator may be set to 00; for bandwidth B, the 2-bit indicator may be set to 01; for bandwidth C, the 2-bit indicator may be set to 10; or for bandwidth D, the 2-bit indicator may be set to 11.

The BS may transmit the bandwidth adaptation indicator 702 to the UE via at least one of physical layer signaling, MAC layer signaling, and RRC layer signaling. Physical layer signaling is characterized in that the UE can quickly process the bandwidth adaptation indicator. The BS may transmit the bandwidth adaptation indicator in a UE-specific signaling manner or a UE group common signaling manner in the cell.

In the case where DL and UL signals are transmitted/received in the same frequency band as a Time Division Duplex (TDD) system, if DL BWP and UL BWP are related or associated with each other (e.g., a change from bandwidth a to bandwidth B in DL results in a change of UL from bandwidth a to bandwidth B, and activation of bandwidth B in DL results in activation of bandwidth B in UL), the UL bandwidth may be switched according to DL bandwidth switching, as shown in part (B) of fig. 7. That is, if the DL bandwidth is changed or switched from bandwidth a701 to bandwidth B705 as indicated by the bandwidth adaptation indicator 702 transmitted from the BS to the UE, the UL bandwidth is also changed or switched from bandwidth a751 to bandwidth B755.

As shown in part (B) of fig. 7, each of the bandwidths configured to the UEs is considered to have a PUCCH transmission resource (i.e., a bandwidth a751 having a PUCCH transmission resource 760 and a bandwidth B755 having a PUCCH transmission resource 770). If the UE receives DCI in slot #1706, which is transmitted in DL control channel 714 transmitted by the BS, the UE may receive DL data on DL data channel 720 indicated by the DCI and transmit a reception acknowledgement (HARQ ACK) corresponding to the DL data to the BS on PUCCH resources at a timing (e.g., slot # 3708) as indicated via the DCI. Here, as indicated via DCI, the UE locates a PUCCH resource within a bandwidth of a timing of receiving DCI, that is, PUCCH resource 760 of UL bandwidth a751 activated at a timing of receiving DCI (slot # 1706), and should transmit HARQ ACK corresponding to DL data 720 in bandwidth B755 at a timing (slot #3) on the PUCCH, so that the BS can assume that the UE transmits HARQ ACK on PUCCH resource 770 in UL bandwidth B755. In this case, the BS may not successfully receive the HARQ ACK corresponding to the DL data 720. Therefore, in the case where the UL bandwidth varies with the variation of the DL bandwidth, a method is required for the UE and the BS to accurately determine the UL bandwidth switching timing or the PUCCH transmission resource. The following two methods are disclosed.

Method 1 determines a PUCCH transmission resource based on an UL bandwidth activated at a PUCCH transmission start time or a predetermined time K before the PUCCH transmission start time.

Method 2 changes a corresponding UL bandwidth at a timing (symbol or slot) at which a HARQ ACK corresponding to DL data received in a DL bandwidth changed upon receiving a bandwidth adaptation indicator is transmitted.

Method 1 is described in more detail with reference to fig. 7.

In case DL and UL signals are transmitted/received in the same frequency band (or DL and UL frequency bands have the same center frequency), as in a TDD system, or DL and UL BWPs are related or associated with each other (e.g., a change from bandwidth a to bandwidth B in DL results in a change from bandwidth a to bandwidth B in UL, and activation of bandwidth B in DL results in activation of bandwidth B in UL), the UL bandwidth may change according to the change in DL bandwidth.

That is, if the DL bandwidth a701 is adjusted or changed to the DL bandwidth B705, as indicated by the bandwidth adaptation indicator 702 transmitted from the BS to the UE. Further, UL bandwidth a751 may also be changed to UL bandwidth B755, and in this case, the UL bandwidth switching timing (symbol or slot) may be the same as the DL bandwidth switching timing. The UL bandwidth switching timing (symbol or symbol) may occur after a time X from the DL bandwidth switching timing, where the length of X may be equal to or less than a symbol or slot. The value of X may be determined based on the UE capability or predefined between the BS and the UE. The value of X may be configured to the UE via higher layer signaling or system information (e.g., a signal transmitted with SI-RNTI) from the BS. The BS may transmit higher layer signaling including a value of X for configuring UL BWP to the UE.

In the case where the UL bandwidth configured to the UE has a corresponding PUCCH transmission resource (i.e., bandwidth a751 and bandwidth B755 have PUCCH transmission resources 760 and 770, respectively, as shown in part (B) of fig. 7), upon receiving DCI transmitted in the DL control channel 714 transmitted by the BS in slot #1706, the UE may receive DL data on the DL data channel 720 indicated via the DCI and transmit HARQ ACK corresponding to the DL data to the BS on the PUCCH resource indicated via the DCI at the timing indicated via the DCI (e.g., slot # 3708). In this case, according to method 1, the BS can assume that the UE transmits HARQ ACK on PUCCH resources of a bandwidth activated at a timing (slot # 3708) that should carry HARQ ACK corresponding to DL data 720, thereby being able to successfully receive HARQ ACK corresponding to DL data 720.

PUCCH resources may also be configured for UL bandwidths a and B of the UE, respectively.

Fig. 8 is a diagram illustrating a transmission/reception bandwidth adaptation operation according to an embodiment.

Referring to fig. 8, UL bandwidths (i.e., UL bandwidth a802 and UL bandwidth B803) constituting a UL system bandwidth allocated to a UE may be configured with corresponding PUCCH resources. For example, the UE may be configured with PUCCH # 1810 and PUCCH #2820 in bandwidth a802, and PUCCH # 1830 and PUCCH # 2840 in bandwidth B803. The UE may receive configuration values such as PUCCH format, length, and frequency resource location for each bandwidth, respectively. The bandwidth a802 and the bandwidth B803 are independently configured with configuration values of different PUCCH formats, lengths, and frequency resource positions.

Assuming that the UE transmits the HARQ ACK on the PUCCH 770 within the bandwidth activated at the timing (slot # 3708) at which the HARQ ACK corresponding to the DL data 720 is scheduled as indicated via the DCI714 according to method 1, it may be determined that the PUCCH transmission timing and resource (or PUCCH format index or PUCCH format) indicated via the DCI714 is the PUCCH transmission timing and resource (or PUCCH format index or PUCCH format) in the bandwidth activated at the timing (slot # 3708) of the HARQ ACK corresponding to the DL data 720 as indicated via the DCI714, rather than the bandwidth activated at the timing (slot # 1706) at which the DCI714 is received. That is, the UE determines that the PUCCH transmission timing and resource (or PUCCH format index or PUCCH format, for example, PUCCH #1) indicated via DCI714 is the PUCCH transmission timing and resource (or PUCCH format index or PUCCH format) of the bandwidth activated at the timing (slot # 3708) of transmitting the HARQ ACK corresponding to DL data 720 indicated via DCI 714. In other words, as shown in fig. 8, the UE determines that the PUCCH transmission timing and resource indicated via the DCI714 is PUCCH # 1830 of the bandwidth B803 activated in slot #3, and transmits the HARQ ACK corresponding to the DL data 720 on PUCCH # 1830.

In the case where the configuration of PUCCH transmission resources (or PUCCH format index or PUCCH format) per BWP is different so as not to be mapped one by one (e.g., when BWP a is configured with 3 PUCCH resources and BWP B is configured with 2 PUCCH resources), the UE may determine PUCCH transmission timing and resources (or PUCCH format index or PUCCH format, such as PUCCH #1) through modulo arithmetic. In the case where the UE is allocated BWP a configured with 3 PUCCH resources and BWP B is configured with 2 PUCCH resources, if BWP a is activated, it may be assumed that the bandwidth activated at the timing (slot #3) of transmitting harq ack corresponding to DL data 720 indicated via DCI714 is BWP B. PUCCH transmission timing and resource (or PUCCH format index or PUCCH format) used by the UE in PUCCH transmission may be determined based on a value obtained by modulo operation between values of the PUCCH resource (or PUCCH format index or PUCCH format) indicated through the DCI714 and the PUCCH resource (or PUCCH format index or PUCCH format) configured in the changed BWP B.

As described above, BWP a is configured with three PUCCH resources (PUCCH #1, PUCCH #2, and PUCCH #3) and BWP B is configured with two PUCCH resources (PUCCH #1 and PUCCH #2), however, DCI714 may indicate PUCCH #3 for PUCCH transmission. In this case, the UE may transmit the PUCCH on the PUCCH resource determined as a result of performing the modulo operation on the indicated control channel resource using the value of the control channel resource (or PUCCH format index or PUCCH format) configured in the changed BWP B (i.e., PUCCH #1 configured in BWP B).

Method 2 above will be described in more detail with reference to fig. 9.

Fig. 9 is a diagram illustrating a transmission/reception bandwidth adaptation operation according to an embodiment.

In case DL and UL signals are transmitted/received in the same frequency band (or DL and UL frequency bands have the same center frequency), as in a TDD system, or DL and UL BWPs are related or associated with each other (e.g., a change from bandwidth a to bandwidth B in DL results in a change from bandwidth a to bandwidth B in UL, and an activation of bandwidth B in DL results in an activation of UL bandwidth B), the UL bandwidth may change according to the change of DL bandwidth, as shown in fig. 9.

That is, referring to fig. 9, if DL bandwidth a901 is adjusted or changed to DL bandwidth B905 as shown by a bandwidth adaptation indicator 902 transmitted from a BS to a UE, UL bandwidth a951 may also be changed to UL bandwidth B955, and it may be assumed that UL bandwidth switching timing (symbol or slot) is the same as DL bandwidth switching timing in the above-described method 1. If the UL and DL bandwidth switching timings are assumed to be the same as each other as in method 1 described with reference to fig. 7, the UE must determine to transmit the PUCCH using PUCCH transmission timing and resources (or PUCCH format index or PUCCH format) in the bandwidth activated at the timing (slot # 3708) of transmitting the HARQ ACK corresponding to the DL data 720 as indicated via the DCI714, instead of the bandwidth activated at the timing (slot # 1706) of receiving the DCI 714. Therefore, it may be difficult to ensure a sufficient processing time of the UE between the PUCCH transmission resource determination time and the PUCCH transmission run time.

In method 2, by changing the UL bandwidth at the timing (symbol or slot) of transmitting HARQ ACK corresponding to DL data received in the DL bandwidth changed at the time of receiving the bandwidth adaptation indicator, the UE may determine PUCCH transmission resources based on the bandwidth activated at the timing (slot # 1706) of receiving DCI 714. That is, it is assumed that PUCCH transmission resources are configured for the corresponding UL bandwidth allocated to the UE (i.e., bandwidth a951 and bandwidth B955 are configured with PUCCH resources 960 and 970, respectively, as shown in fig. 9). If the UE receives DCI transmitted by the BS on the DL control channel 914 in slot # 1906, it may receive DL data on the DL data channel 920 indicated via the DCI and transmit HARQ ACK corresponding to the DL data on a PUCCH resource (PUCCH format index or PUCCH format) indicated via the DCI914 among PUCCH resources (PUCCH format index or PUCCH format) configured in UL bandwidth a951 activated at the timing of receiving the DCI (e.g., slot # 1906).

Alternatively, the method 2 may be described such that the UE performs bandwidth switching from the DL bandwidth a901 to the DL bandwidth B905 according to the bandwidth adaptation indicator 902 transmitted by the BS. The UL bandwidth of the UE may be adjusted or switched from UL bandwidth a951 to UL bandwidth B955, and in this case, it may be determined that the UL bandwidth switching timing (symbol or slot) occurs after time K990 (symbol or slot) after the DL bandwidth switching timing. Here, K990 may be greater than or equal to a symbol or slot length and determined based on the UE capability, or may be a predefined length (symbol or slot) between the BS and the UE. The value of K990 may be configured to the UE via higher layer signaling or system information (e.g., a signal transmitted with SI-RNTI) from the BS. The BS may send the value of K990 to the UE via higher layer signaling for configuring UL BWP. The value of K990 may also be sent to the UE in a signal carrying a bandwidth adaptation indicator.

Alternatively, if the UE adjusts or switches its DL bandwidth from DL bandwidth a901 to DL bandwidth B905 based on the bandwidth adaptation indicator received from the BS, the UL bandwidth of the UE may also be adjusted or switched from UL bandwidth a951 to UL bandwidth B955, and in this case, it may be determined that UL bandwidth switching timing (symbol or slot) occurs at a time before the timing at which HARQ ACK corresponding to DL data transmitted in the changed DL bandwidth is reported or transmitted to the BS on the PUCCH, or occurs at time X before the corresponding timing. Here, the PUCCH transmitted before switching to UL bandwidth B955 is a PUCCH determined based on UL bandwidth a 951.

Alternatively, if the UE adjusts or switches its DL bandwidth from DL bandwidth a901 to DL bandwidth B905 based on the bandwidth adaptation indicator received from the BS, the UL bandwidth of the UE may also be adjusted or switched from UL bandwidth a951 to UL bandwidth B955, and in this case, it may be determined that UL bandwidth switching timing (symbol or slot) occurs at a time before the timing at which HARQ ACK corresponding to DL data transmitted in the changed DL bandwidth is initially reported or transmitted to the BS on the PUCCH, or occurs at time X before the corresponding timing. Here, the value of X may be less than or equal to a symbol length or a slot length and determined based on the UE capability, or may be a predefined symbol or slot length between the BS and the UE. The value of X may be configured to the UE via higher layer signaling or system information (e.g., a signal transmitted with SI-RNTI) from the BS. The BS may send the value of X to the UE via higher layer signaling for configuring UL BWP. Here, the PUCCH transmitted before switching to UL bandwidth B955 is a PUCCH determined based on UL bandwidth a 951.

Based on the UL bandwidth switching timing determined by method 2, the UE may assume that the PUCCH is configured or instructed to be transmitted together with the bandwidth switching timing after transmitting the UL bandwidth switching timing using PUCCH resource (or PUCCH format index or PUCCH format) 980 determined based on changed bandwidth B955 as described above, and that the PUCCH is transmitted before transmitting the UL bandwidth switching timing using PUCCH resource 960 determined based on UL bandwidth a 951.

The UE may obtain configuration information (e.g., PUCCH format, PUCCH length, sequence, frequency hopping, time/frequency resource allocation, and orthogonal sequence information) of a PUCCH for transmitting UCI (e.g., SR, DL data channel reception result ((HARQ-ACK), and Channel State Information (CSI)), and determine PUCCH configuration information for transmitting UCI.

Fig. 10 is a diagram illustrating a transmission/reception bandwidth adaptation operation according to an embodiment.

Fig. 10 depicts the PUCCH case transmitted during slot n in UL BWP 1002, which is a portion of UL system bandwidth 100. The UE may receive configuration information on a PUCCH1010 for transmitting SR information. The UE may be configured with multiple PUCCHs to distinguish among SRs for UL transmission of data, or logical channels, or groups of logical channels.

Referring to fig. 10, PUCCH #11010 includes PUCCH resources for transmitting SR information associated with a first logical channel, and PUCCH #21020 includes PUCCH resources for transmitting SR information associated with a second logical channel. If the UE needs to transmit UL data on the first logical channel, the UE may transmit SR information to the BS on PUCCH #11010, so that the BS configures or allocates UL data channel transmission resources suitable for the logical channel (first logical channel) on which the UE wants to transmit data.

The UE may also be configured with a PUCCH 1030 for transmitting a HARQ ACK corresponding to a DL data channel received at slot n or earlier to the BS. The configuration information of the PUCCH carrying UCI may be independently configured. That is, PUCCH transmission formats for PUCCH #11010, PUCCH #21020, and PUCCH #31030 may be independently configured. Therefore, the PUCCH transmission format may be different among PUCCH #11010, PUCCH #21020, and PUCCH # 31030. In addition, PUCCH transmission length or PUCCH transmission duration length of PUCCH #11010, PUCCH #21020, and PUCCH #31030 may be independently configured. Accordingly, the PUCCH transmission length or PUCCH transmission duration length may be different among PUCCH #11010, PUCCH #21020, and PUCCH # 31030.

The UE may receive a plurality of PUCCH configurations via higher layer signaling for transmitting HARQ ACK corresponding to DL data received at slot n or earlier to the BS. The DCI for scheduling the DL data channel may include an indicator indicating a PUCCH configuration used by the UE in transmitting a HARQ ACK corresponding to the DL data channel among a plurality of PUCCH configurations signaled to the UE. The UE may send a HARQ ACK using PUCCH resources 1030 as indicated by the indicator.

In case that the UE transmits a HARQ ACK corresponding to a DL data channel received from the BS at slot n or earlier in slot n, if SR information is also transmitted at slot n (i.e., when a plurality of UCIs are transmitted at slot n), the UE may transmit UCI on a corresponding PUCCH or one or more UCIs on one of the plurality of PUCCHs. Typically, it is preferable to transmit UCI using only one of a plurality of PUCCHs because transmission power used by the UE in transmitting a signal is limited.

For example, the UE may transmit HARQ ACK and SR information corresponding to DL data on PUCCH # 11010. Since the BS determines that the UE transmits the HARQ ACK corresponding to the DL data channel on PUCCH #31030 in slot n, if the HARQ ACK corresponding to the DL data channel is received on PUCCH #11010 configured to be used by the UE in transmitting SR information, the BS may determine that the UE has transmitted the HARQ ACK corresponding to the DL data channel and SR information of a logical channel corresponding to PUCCH # 11010. In case that slot n transmits SR information of a logical channel corresponding to PUCCH #21020, the UE may transmit HARQ ACK corresponding to DL data channel on PUCCH # 21020. If the BS receives the HARQ ACK corresponding to the DL data channel on PUCCH #21020 configured to be used by the UE in transmitting the SR information, it may be determined that the UE has transmitted the HARQ ACK corresponding to the DL data channel and the SR information of the logical channel corresponding to PUCCH # 21020.

In this case, UCI may be different in at least one of PUCCH format, PUCCH length (or the number of symbols occupied by PUCCH in the time domain), transmission sequence, orthogonal sequence, and cyclic shift. Although it may be assumed that UCI is different in PUCCH length, the method of the present disclosure is also applicable to a case where UCI is different in at least one of PUCCH attributes including PUCCH format, PUCCH sequence, and PUCCH orthogonal sequence.

Fig. 10 depicts PUCCHs having different PUCCH lengths corresponding to UCI. For example, PUCCH #11010 carries SR information corresponding to a first logical channel at slot n, PUCCH #21020 carries SR information corresponding to a second logical channel at slot n, and PUCCH #31030 carries HARQ ACK corresponding to a DL data channel at slot n as configured via DCI transmitted by the BS for scheduling DL data. If the SR information corresponding to the first logical channel and the corresponding HARQ ACK for DL data are determined to be simultaneously transmitted in slot n, the UE may transmit both the SR information corresponding to the first logical channel and the corresponding HARQ ACK for DL data channel to the BS on PUCCH # 11010. However, in this case, the configuration information (i.e., PUCCH length) on PUCCH #31030 is different from the configuration information on PUCCH # 11010.

In case of simultaneously transmitting different UCI or PUCCH transmission resources corresponding to different UCI are overlapped on at least one symbol in a time domain, the UE may transmit UCI on one of PUCCH corresponding to UCI. If it is necessary to simultaneously transmit both SR information corresponding to the first logical channel and corresponding HARQ ACK corresponding to the DL data channel in the slot n, or if a PUCCH (PUCCH #1) for transmitting SR information corresponding to the first logical channel and a PUCCH (PUCCH #3) for transmitting corresponding HARQ ACK corresponding to the DL data channel are overlapped on at least one symbol in a time domain, the UE may transmit HARQ ACK corresponding to the DL data channel and SR information (hereinafter, referred to as SR1) corresponding to the first logical channel on PUCCH #1 (i.e., both SR1 and HARQ ACK corresponding to the DL data channel are simultaneously transmitted to the BS on PUCCH # 1).

In this case, if PUCCH #11010 and PUCCH #31030 are different in PUCCH length (or the number of PUCCH symbols, N _ PUCCH _ symbol), the UE may generate HARQ ACK corresponding to DL data channel based on the configuration information of PUCCH #1 and transmit the HARQ ACK on the corresponding frequency and time resource (i.e., PUCCH # 11010). In addition to bit information to be transmitted on PUCCH #11010 (e.g., in the case of transmitting only SR, b (0) ═ 0 as bit information to be transmitted on PUCCH # 11010), the UE may generate a signal carrying harq ack information using configuration information on PUCCH #11010 and transmit the signal on the configured time and frequency resources (i.e., PUCCH # 11010). That is, the UE may encode bit information of the HARQ ACK corresponding to the received DL data in a Binary Phase Shift Keying (BPSK) or Quadrature Phase Shift Keying (QPSK) scheme to generate a signal including information to be transmitted, multiply the signal by a predetermined sequence (e.g., Zadoff-Chu sequence), and spread the resultant signal by an orthogonal sequence value w _ i (m) to generate a signal to be transmitted on the PUCCH # 11010.

That is, compared to the case where only SR1 is transmitted on PUCCH #11010, the UE may generate a HARQ ACK signal to be transmitted in the same configuration as that for the case where only SR1 is transmitted on PUCCH #11010 except for transmission information (i.e., HARQ ACK information), and transmit the HARQ ACK signal on time and frequency resources allocated in PUCCH # 11010.

The configuration information on PUCCH #11010 may include all setting values required to generate PUCCH, including: PUCCH length (or the number of PUCCH symbols defined as N _ PUCCH _ symbol), Zadoff-Chu sequence group number, sequence number in the group, frequency hopping configuration, the number of symbols of the first and second frequency hopping periods or spreading factors of the first and second frequency hopping periods when frequency hopping is activated (defined as N _ PUCCH _ SF0 and N _ PUCCH _ SF1), and orthogonal sequence values therefor, each of which is configured for PUCCH # 11010.

If PUCCH #11010 and PUCCH #31030 are the same in PUCCH length (or the number of PUCCH symbols defined as N _ PUCCH _ symbol), the UE may generate HARQ ACK corresponding to DL data channel based on configuration information on PUCCH #31030 and transmit the configured time and frequency resources of PUCCH # 11010. In more detail, the UE may encode HARQ ACK corresponding to received DL data in a BPSK or QPSK scheme to generate a signal, multiply the signal by a predetermined sequence (e.g., Zadoff-Chu sequence), and spread the multiplication result by an orthogonal sequence value w _ i (m) to generate a spread signal. That is, the UE may generate a HARQ ACK signal to be transmitted with the same configuration value as that for the case where only the HARQ ACK is transmitted on PUCCH #31030, and transmit the HARQ ACK signal on the time and frequency resources allocated in PUCCH # 1.

Here, the configuration information on the PUCCH #31030 may include a Zadoff-Chu sequence, a Zadoff-Chu sequence group number, a sequence number in the group, a PUCCH length (or the number of PUCCH symbols defined as N _ PUCCH _ symbol), a frequency hopping configuration, the number of symbols of first and second frequency hopping periods or spreading factors (defined as N _ PUCCH _ SF0 and N _ PUCCH _ SF1) of the first and second frequency hopping periods when frequency hopping is activated, and orthogonal sequence values therefor, each of which is configured for the PUCCH. The configuration information may be received via higher layer signaling and/or DCI, and a configuration value obtained through one or any combination of the higher layer signaling and DCI may be determined as the configuration information according to a rule indicated via DCI. Therefore, even when PUCCH #11010 and PUCCH #31030 are the same in PUCCH length (or the number of PUCCH symbols defined as N _ PUCCH _ symbol), the UE can generate HARQ ACK corresponding to a DL data channel based on the configuration information on PUCCH #11010 and transmit the HARQ ACK on the time and frequency resources configured for PUCCH # 11010.

Fig. 11 is a flowchart illustrating a UE operation according to an embodiment of the present disclosure. In step 1110, the UE receives BWP configuration information (e.g., information as shown in table 1) and PUCCH configuration information on one or more BWPs as shown in table 2 from the BS via higher layer signaling, a broadcast channel, or a DL data channel including system information (e.g., a DL data channel scheduled via DCI scrambled with SI-RNTI). In step 1120, the UE activates at least one DL and UL BWP based on a BWP adaptation indicator or an activation indicator included in DCI transmitted via higher layer signaling or a DL control channel. If DL and UL BWPs are associated with each other, the UL BWP may be changed or activated according to the DL BWP adaptation indicator.

In case that the UE should transmit HARQ ACK, periodic CSI or SRS, or SR corresponding to DL data to the BS, the UE determines in step 1130 whether the currently activated UL BWP has the configured PUCCH. If it is determined at 1130 that the currently activated UL BWP has the configured PUCCH, the UE transmits an UL signal on the PUCCH (i.e., in the activated UL BWP configured by the BS or indicated via the DCI transmitted by the BS) at step 1150. If it is determined in step 1130 that the currently activated UL BWP has no configured PUCCH, the UE may activate BWP with the configured PUCCH and transmit an UL signal on the PUCCH configured in BWP in step 1140.

Fig. 12 is a flowchart illustrating a UE operation according to an embodiment.

Referring to fig. 12, in step 1210, the UE receives BWP configuration information (e.g., information as shown in table 1) and PUCCH configuration information on one or more BWPs as shown in table 2 from the BS via higher layer signaling, a broadcast channel, or a DL data channel including system information (e.g., a DL data channel scheduled via DCI scrambled with SI-RNTI). In step 1220, the UE activates at least one DL and UL BWP based on a BWP adaptation indicator or an activation indicator included in DCI transmitted via higher layer signaling or a DL control channel. If DL and UL BWPs are related to each other, the UL BWP may be changed or activated according to the DL BWP adaptation indicator.

If UL BWP is changed or activated in a related manner according to the DL BWP adaptation indicator, it may be necessary to consider a case in which the UE must transmit HARQ ACK, periodic CSI or SRS, or SR corresponding to DL data received from the BS. In step 1240, the UE may determine UL BWP handover or activation timing according to the aforementioned method 1 or method 2 and determine PUCCH resources (or PUCCH format index or PUCCH format) configured in the activated BWP to transmit UL signals on the corresponding control channel resources in step 1250.

The UE and the BS are depicted in fig. 13 and 14, respectively, each consisting of a transmitter, a receiver, and a processor for implementing the above-described method.

Fig. 13 is a block diagram showing a configuration of a UE according to an embodiment.

Referring to fig. 13, the UE may include a processor 1301, a receiver 1302, and a transmitter 1303.

The processor 1301 may control the overall operation of the UE. For example, the processor 1301 may control components differently to perform different operations based on the performed method (i.e., activating the UL bandwidth and determining the PUSCH transmission operation according to the bandwidth configuration method, the bandwidth adaptation method, and the PUCCH transmission resource configuration method).

The receiver 1302 and the transmitter 1303 may be collectively referred to as a transceiver. The transceiver may transmit and receive signals to and from the BS. The signals may include control information and data. The transceiver may include an RF transmitter for up-converting and amplifying a signal to be transmitted, and an RF receiver for low-noise amplifying and down-converting a received signal. The transceiver may output a signal received through a radio channel to the processor 1301 and transmit a signal output from the processor 1301 through the radio channel.

Fig. 14 is a block diagram showing a configuration of a BS according to the embodiment.

Referring to fig. 14, the BS may include a processor 1401, a receiver 1402, and a transmitter 1403

The processor 1401 may control the overall operation of the BS. For example, the processor 1401 may control components differently based on the executed methods (i.e., a bandwidth configuration method, a bandwidth adaptation method, and a PUCCH transmission resource configuration method).

The receiver 1402 and the transmitter 1403 may be collectively referred to as a transceiver. The transceiver may transmit and receive signals to and from the terminal. The signals may include control information and data. The transceiver may include an RF transmitter for up-converting and amplifying a signal to be transmitted, and an RF receiver for low-noise amplifying and down-converting a received signal. The transceiver may output a signal received through a radio channel to the processor 1401 and transmit a signal output from the processor 1401 through the radio channel.

As described above, the UL resource configuration method and apparatus of the present disclosure are advantageous in facilitating the operation of a 5G system by making it possible to flexibly configure UL control and data channel transmission resources.

While the present disclosure has been particularly shown and described with reference to certain embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the following claims and their equivalents.

Claims (15)

1. A method for transmitting uplink control information in a wireless communication system, the method comprising:

receiving configuration information on a plurality of bandwidth parts (BWPs) from a base station;

receiving downlink control information and downlink data from the base station;

receiving, from the base station, BWP adaptation information indicating a change in active BWP;

identifying uplink control channel resources for transmitting acknowledgement information in response to the downlink data; and

transmitting the acknowledgement information to the base station on the identified uplink control channel resource.

2. The method of claim 1, wherein the uplink control channel resources are identified based on an active BWP acknowledging information transmission timing.

3. The method according to claim 2, wherein the uplink control channel resource is identified based on a modulo operation between an uplink control channel resource index of the active BWP and an uplink control channel resource index indicated by the downlink control information.

4. The method of claim 1, wherein the uplink control channel resources are identified based on an active BWP of a downlink control information reception timing.

5. A method for receiving uplink control information in a wireless communication system, the method comprising:

transmitting configuration information regarding a plurality of bandwidth parts (BWPs) to a terminal;

transmitting downlink control information and downlink data to the terminal;

transmitting, to the terminal, BWP adaptation information indicating a change in active BWP;

identifying uplink control channel resources for receiving acknowledgement information in response to the downlink data; and

receiving the acknowledgement information from the terminal on the identified uplink control channel resource.

6. The method of claim 5, wherein the uplink control channel resource is identified based on an active BWP of acknowledgement information reception timing.

7. The method of claim 6, wherein the uplink control channel resource is identified based on a modulo operation between an uplink control channel resource index of the active BWP and an uplink control channel resource index indicated by the downlink control information.

8. The method of claim 5, wherein the uplink control channel resources are identified based on an active BWP of a downlink control information transmission timing.

9. A terminal for transmitting uplink control information in a wireless communication system, the terminal comprising:

a transceiver; and

a controller coupled with the transceiver and configured to:

receiving configuration information on a plurality of bandwidth parts (BWPs) from a base station;

receiving downlink control information and downlink data from the base station;

receiving, from the base station, BWP adaptation information indicating a change in active BWP;

identifying uplink control channel resources for transmitting acknowledgement information in response to the downlink data; and

transmitting the acknowledgement information to the base station on the identified uplink control channel resource.

10. The terminal of claim 9, wherein the uplink control channel resources are identified based on an active BWP acknowledging information transmission timing.

11. The terminal of claim 10, wherein the uplink control channel resource is identified based on a modulo operation between an uplink control channel resource index of the active BWP and an uplink control channel resource index indicated by the downlink control information.

12. The terminal of claim 9, wherein the uplink control channel resources are identified based on an active BWP of a downlink control information reception timing.

13. A base station for receiving uplink control information in a wireless communication system, the base station comprising:

a transceiver; and

a controller coupled with the transceiver and configured to:

transmitting configuration information regarding a plurality of bandwidth parts (BWPs) to a terminal;

transmitting downlink control information and downlink data to the terminal;

transmitting, to the terminal, BWP adaptation information indicating a change in active BWP;

identifying uplink control channel resources for receiving acknowledgement information in response to the downlink data; and

receiving the acknowledgement information from the terminal on the identified uplink control channel resource.

14. The base station of claim 13, wherein the uplink control channel resource is identified based on an active BWP of an acknowledgement information reception timing.

15. The base station of claim 14, wherein the uplink control channel resource is identified based on a modulo operation between an uplink control channel resource index of the active BWP and an uplink control channel resource index indicated by the downlink control information.

Images