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WO2024031646A1 - Procédé de communication sans fil et dispositifs associés - Google Patents

Procédé de communication sans fil et dispositifs associés Download PDF

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Publication number
WO2024031646A1
WO2024031646A1 PCT/CN2022/112153 CN2022112153W WO2024031646A1 WO 2024031646 A1 WO2024031646 A1 WO 2024031646A1 CN 2022112153 W CN2022112153 W CN 2022112153W WO 2024031646 A1 WO2024031646 A1 WO 2024031646A1
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WIPO (PCT)
Prior art keywords
puschs
pdschs
mcs
cbg
dci
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PCT/CN2022/112153
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English (en)
Inventor
Yiwei DENG
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Huizhou TCL Mobile Communication Co Ltd
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Huizhou TCL Mobile Communication Co Ltd
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Priority to CN202280097873.1A priority Critical patent/CN119487944A/zh
Priority to PCT/CN2022/112153 priority patent/WO2024031646A1/fr
Publication of WO2024031646A1 publication Critical patent/WO2024031646A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025—Transmission of mode-switching indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1896—ARQ related signaling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1822—Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H04W72/232—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal the control data signalling from the physical layer, e.g. DCI signalling

Definitions

  • the present application relates to wireless communication technologies, and more particularly, to a wireless communication method, and related devices such as a user equipment (UE) and a base station (BS) (e.g., a gNB) .
  • UE user equipment
  • BS base station
  • gNB gNode B
  • Wireless communication systems such as the third-generation (3G) of mobile telephone standards and technology are well known.
  • 3G standards and technology have been developed by the Third Generation Partnership Project (3GPP) .
  • the 3rd generation of wireless communications has generally been developed to support macro-cell mobile phone communications.
  • Communication systems and networks have developed towards being a broadband and mobile system.
  • UE user equipment
  • RAN radio access network
  • the RAN includes a set of base stations (BSs) which provide wireless links to the UEs located in cells covered by the base stations, and an interface to a core network (CN) which provides overall network control.
  • BSs base stations
  • CN core network
  • the RAN and CN each conducts respective functions in relation to the overall network.
  • LTE Long-Term Evolution
  • E-UTRAN Evolved Universal Mobile Telecommunication System Territorial Radio Access Network
  • 5G or NR new radio
  • the 5G New Radio (NR) standard will support a multitude of different services each with very different requirements. These services include Enhanced Mobile Broadband (eMBB) for high data rate transmission, Ultra-Reliable Low Latency Communication (URLLC) for devices requiring low latency and high link reliability and Massive Machine-Type Communication (mMTC) to support a large number of low-power devices for a long life-time requiring highly energy efficient communication.
  • eMBB Enhanced Mobile Broadband
  • URLLC Ultra-Reliable Low Latency Communication
  • mMTC Massive Machine-Type Communication
  • EXtended Reality (XR) and Cloud Gaming are some of the most important 5G media applications under consideration in the industry.
  • the XR is an umbrella term for different types of realities and refers to all real-and-virtual combined environments and human-machine interactions generated by computer technology and wearables. It includes representative forms such as Augmented Reality (AR) , Mixed Reality (MR) and Virtual Reality (VR) and the areas interpolated among them.
  • AR Augmented Reality
  • MR Mixed Reality
  • VR Virtual Reality
  • SID Study Item Description
  • the transmission data rate could be up to 60Mbps and above with limited latency, around 10 ⁇ 30ms.
  • the frame size is varied with time.
  • three major frame types are defined through three different video algorithms with the following characteristics:
  • - P-frames can use previous frames to decompress and are more compressible than I-frames.
  • XR XR downlink
  • 3GPP TR 38.838 Three multi-streams models for XR downlink (DL) traffic are provided in clause 5.1.2 of 3GPP TR 38.838, including sliced-based traffic, Group-Of-Picture (GOP) based traffic and so on.
  • GOP Group-Of-Picture
  • AR UL traffic Three different multi-streams for AR UL traffic are also provided in clause 5.5.2 of 3GPP TR 38.838.
  • Multiple streams may have different traffic characteristics, Quality of Service (QoS) requirements and priorities.
  • QoS Quality of Service
  • the objective of the present application is to provide a wireless communication method and related devices for solving issues in the prior arts, reducing signaling overhead, reducing power consumption, reducing the latency, or improving the resource efficiency.
  • an embodiment of the present application provides a wireless communication method, performed by a user equipment (UE) in a network, the method including: receiving a single Downlink Control Information (DCI) scheduling multiple Physical Downlink Share Channels (PDSCHs) or Physical Uplink Share Channels (PUSCHs) , wherein the single DCI comprises a Modulation and Coding Scheme (MCS) field indicating same or different MCSs for the multiple PDSCHs or PUSCHs; and receiving the multiple PDSCHs or transmitting the multiple PUSCHs with the same or different MCSs.
  • DCI Downlink Control Information
  • PDSCHs Physical Downlink Share Channels
  • PUSCHs Physical Uplink Share Channels
  • MCS Modulation and Coding Scheme
  • an embodiment of the present application provides a wireless communication method, performed by a user equipment (UE) in a network, the method including: receiving a single Downlink Control Information (DCI) scheduling multiple Physical Downlink Share Channels (PDSCHs) or Physical Uplink Share Channels (PUSCHs) , wherein the single DCI comprises a Code Block Group (CBG) field indicating all CBGs within the multiple PDSCHs or PUSCHs; and receiving the multiple PDSCHs or transmitting the multiple PUSCHs with CBG-based transmission.
  • DCI Downlink Control Information
  • PDSCHs Physical Downlink Share Channels
  • PUSCHs Physical Uplink Share Channels
  • CBG Code Block Group
  • an embodiment of the present application provides a wireless communication method, performed by by a base station (BS) in a network, the method including: transmitting to a user equipment (UE) a single Downlink Control Information (DCI) scheduling multiple Physical Downlink Share Channels (PDSCHs) or Physical Uplink Share Channels (PUSCHs) , wherein the single DCI comprises a Modulation and Coding Scheme (MCS) field indicating same or different MCSs for the multiple PDSCHs or PUSCHs; and transmitting the multiple PDSCHs or receiving the multiple PUSCHs with the same or different MCSs.
  • DCI Downlink Control Information
  • PDSCHs Physical Downlink Share Channels
  • PUSCHs Physical Uplink Share Channels
  • MCS Modulation and Coding Scheme
  • an embodiment of the present application provides a wireless communication method, performed by by a base station (BS) in a network, the method including: transmitting to a user equipment (UE) a single Downlink Control Information (DCI) scheduling multiple Physical Downlink Share Channels (PDSCHs) or Physical Uplink Share Channels (PUSCHs) , wherein the single DCI comprises a Code Block Group (CBG) field indicating all CBGs within the multiple PDSCHs or PUSCHs; and transmitting the multiple PDSCHs or receiving the multiple PUSCHs with CBG-based transmission.
  • DCI Downlink Control Information
  • PDSCHs Physical Downlink Share Channels
  • PUSCHs Physical Uplink Share Channels
  • CBG Code Block Group
  • an embodiment of the present application provides a UE, including a processor and a transmitter, wherein the processor is configured to call and run program instructions stored in a memory, to cooperate with the transmitter to execute the method of any of the first aspect and the second aspect.
  • an embodiment of the present application provides a UE, including a processor and a transmitter, wherein the processor is configured to call and run program instructions stored in a memory, to cooperate with the transmitter to execute the method of any of the third aspect and the fourth aspect.
  • an embodiment of the present application provides a computer readable storage medium provided for storing a computer program, which enables a computer to execute the method of any of the first to the fourth aspects.
  • an embodiment of the present application provides a computer program product, which includes computer program instructions enabling a computer to execute the method of any of the first to the fourth aspects.
  • an embodiment of the present application provides a computer program, when running on a computer, enabling the computer to execute the method of any of the first to the fourth aspects.
  • FIG. 1 is a schematic block diagram illustrating a communication network system according to an embodiment of the present application.
  • FIG. 2 is a flowchart of a wireless communication method according to a first embodiment of the present application.
  • FIG. 3 is a schematic diagram illustrating an exemplary relationship between MCS field and multiple PDSCHs according to an embodiment of the present application.
  • FIG. 4 is a schematic diagram illustrating another exemplary relationship between MCS field and multiple PDSCHs according to an embodiment of the present application.
  • FIG. 5 is a schematic diagram illustrating which PDSCH should change MCS according to an embodiment of the present application.
  • FIG. 6 is a schematic diagram illustrating MCS of PDSCH changed associated HARQ-ACK feedback according to an embodiment of the present application.
  • FIG. 7 is a flowchart of a wireless communication method according to a second embodiment of the present application.
  • FIG. 8 is a schematic diagram illustrating an exemplary relationship between DCI and CBG of multiple PDSCHs according to an embodiment of the present application.
  • multi-PDSCH and multi-PUSCH scheduling by a single DCI were studied.
  • the intention is to reduce the UE blind decoding complexity for PDCCH in the larger Subcarrier Spacing (SCS) scenario, this feature can also be considered to address the issues of large packet size for XR, it is beneficial to reduce UE bling decoding complexity and save power consumption.
  • SCS Subcarrier Spacing
  • multi-PxSCH scheduling by a single DCI in 3GPP Rel-17 52.6GHz cannot be used directly, some enhancements to reduce the latency and improve resource utilization efficiency need to be considered.
  • a single DCI scheduling multiple PDSCHs or PUSCHs is only supported in Frequency Range 2 (FR2) and most of parameters are shared but the RV, NDI, HARQ-ID, TDRA, etc.
  • a single DCI scheduling multiple PDSCHs or PUSCHs can also be used in Frequency Range 1 (FR1) for XR services thanks to signaling overhead reduction and power saving.
  • FR1 Frequency Range 1
  • SCS Subcarrier Spacing
  • the length of multiple PDSCHs or PUSCHs in time domain will be much less than the channel coherence time
  • MCSs Modulation and Coding Schemes
  • the QoS of each flow will be different, e.g., reliability, etc. So a different MCS for the PDSCH or PUSCH will be needed.
  • the delay budget of each PDSCH or PUSCH within the multiple PDSCHs or PUSCHs is different, parts of the front PDSCHs or PUSCHs within the multiple PDSCHs or PUSCHs have re-transmission opportunities, but for parts of the behind PDSCHs or PUSCHs within the multiple PDSCHs or PUSCHs, there are no opportunities for Re-transmission.
  • conservative MCS will be needed for parts of the behind PDSCHs or PUSCHs within the multiple PDSCHs or PUSCHs.
  • Issue 1 Based on the above analysis, a single DCI scheduling multiple PDSCHs or PUSCHs with different MCSs is needed. How to indicate multiple MCSs in DCI and determine the relationship between multiple MCSs and multiple PDSCHs or PUSCHs should be considered.
  • code block group based (CBG-based) PDSCH transmission was specified by grouping code blocks of a TB into code block groups.
  • the main purposes are 1) to guarantee the coexistence of eMBB and URLLC, 2) to reduce the retransmission resource and further improve the capacity by only re-transmitting the code block groups with erroneous code blocks.
  • CBG-based transmission and re-transmission can further improve the capacity of XR thanks to only the error CBGs are re-transmitted.
  • the CBG-based transmission is disabled in current 3GPP specification, to further improve the capacity of XR, combination with CBG-based and a single DCI scheduling multiple PDSCHs or PUSCHs transmission can be considered.
  • CBG-based transmission and re-transmission can be considered.
  • the associated relationship between CBG and TB and how to indicate of CBGs can be considered.
  • This disclosure proposes some enhanced improvements of a single Downlink Control Information (DCI) scheduling multiple Physical Downlink Share Channel (PDSCH) or Physical Uplink Share Channel (PUSCH) transmissions.
  • DCI Downlink Control Information
  • PDSCH Physical Downlink Share Channel
  • PUSCH Physical Uplink Share Channel
  • MCSs Modulation and Coding Schemes
  • UE User Equipment
  • MCSs Modulation and Coding Schemes
  • a MCS field in DCI can indicate a set of MCS values, the number of MCS values within the set can be equal to the number of PDSCHs or PUSCHs.
  • Each PDSCH or PUSCH within the multiple PDSCHs or PUSCHs has a separate field to indicate the MCS.
  • Each group of the PDSCHs or PUSCHs within the multiple PDSCHs or PUSCHs has a separate field to indicate the MCS information.
  • the MCS field in DCI is extended.
  • Redundancy version (RV) field can be reused for indicating of the MCS, the MCS field and RV field are used together to indicate the MCS of a plurality of PDSCHs or PUSCHs.
  • the MCS of PDSCH or PUSCH can be changed by a signaling, a MAC-CE or DCI or piggybacked DCI can be used to change the MCS of PDSCH (s) and a DCI can be used to change the MCS of PUSCH (s) .
  • a single DCI scheduling multiple PDSCHs/PUSCHs with Code Block Group (CBG) transmission is enabled. More details are provided below:
  • a CBG field in DCI can be used to indicate all CBGs within the multiple PDSCHs or PUSCHs, multiple CBGs of a PDSCH or PUSCH within multiple PDSCHs or PUSCHs share a same CBG subfield of the CBG field.
  • a CBG field in DCI can be used to indicate all CBGs within the multiple PDSCHs and PUSCHs, all of the CBs within the multiple PDSCHs or PUSCHs are considered as a whole part (e.g., denoted as total CBs) and are connected in order in the respect of CB indexes.
  • the CBG field size is extended.
  • Each PDSCH or PUSCH within multiple PDSCHs or PUSCHs has a same size for CBG indication.
  • FIG. 1 illustrates that, in some embodiments, one or more user equipments (UEs) 10 and a base station (e.g., gNB or eNB) 20 for wireless communication in a communication network system 30 according to an embodiment of the present application are provided.
  • the communication network system 30 includes the one or more UEs 10 and the base station 20.
  • the one or more UEs 10 may include a memory 12, a transceiver 13, and a processor 11 coupled to the memory 12 and the transceiver 13.
  • the base station 20 may include a memory 22, a transceiver 23, and a processor 21 coupled to the memory 22 and the transceiver 23.
  • the processor 11 or 21 may be configured to implement proposed functions, procedures and/or methods described in this description.
  • Layers of radio interface protocol may be implemented in the processor 11 or 21.
  • the memory 12 or 22 is operatively coupled with the processor 11 or 21 and stores a variety of information to operate the processor 11 or 21.
  • the transceiver 13 or 23 is operatively coupled with the processor 11 or 21, and the transceiver 13 or 23 transmits and/or receives a radio signal.
  • the processor 11 or 21 may include application-specific integrated circuit (ASIC) , other chipset, logic circuit and/or data processing device.
  • the memory 12 or 22 may include read-only memory (ROM) , random access memory (RAM) , flash memory, memory card, storage medium and/or other storage device.
  • the transceiver 13 or 23 may include baseband circuitry to process radio frequency signals.
  • modules e.g., procedures, functions, and so on
  • the modules can be stored in the memory 12 or 22 and executed by the processor 11 or 21.
  • the memory 12 or 22 can be implemented within the processor 11 or 21 or external to the processor 11 or 21 in which case those can be communicatively coupled to the processor 11 or 21 via various means as is known in the art.
  • This disclosure proposes various approaches to support a single DCI scheduling multiple PDSCH or PUSCH transmissions with different MCSs for wireless transmission.
  • UE can receive or transmit multiple PDSCHs or PUSCHs with different MCSs.
  • MCS multiple PDSCHs or PUSCHs
  • some enhanced improvements can be considered.
  • FIG. 2 is a flowchart of a wireless communication method according to a first embodiment of the present application.
  • the method 100 includes the following.
  • Step 110 by using the processor 11 cooperating with the transceiver 13, the UE 10 receives from the base station 20 a single Downlink Control Information (DCI) scheduling multiple Physical Downlink Share Channels (PDSCHs) or Physical Uplink Share Channels (PUSCHs) , wherein the single DCI includes a Modulation and Coding Scheme (MCS) field indicating same or different MCSs for the multiple PDSCHs or PUSCHs.
  • DCI Downlink Control Information
  • PDSCHs Physical Downlink Share Channels
  • PUSCHs Physical Uplink Share Channels
  • MCS Modulation and Coding Scheme
  • Step 120 by using the processor 11 cooperating with the transceiver 13, the UE 10 receives the multiple PDSCHs or transmits the multiple PUSCHs with the same or different MCSs.
  • the single DCI scheduling the multiple PDSCHs or PUSCHs with same or different MCSs can match the large packet size and multiple flows of XR services and it’s beneficial for signaling overhead reduction and power saving.
  • the MCS field in the single DCI indicates a set of MCS values, and each MCS value in the set indicates a MCS of one or more corresponding PDSCHs or PUSCHs among the multiple PDSCHs or PUSCHs. More specifically, a number of the MCS values in the set is equal to a number of the multiple PDSCHs or PUSCHs, and the MCS values in the set and the multiple PDSCHs or PUSCHs have an in-order one-to-one mapping relationship. Alternatively, a number of the MCS values in the set is larger than a number of the multiple PDSCHs or PUSCHs. Alternatively, a number of the MCS values in the set is smaller than a number of the multiple PDSCHs or PUSCHs.
  • the set of MCS values is represented by an index in the MCS field in the single DCI.
  • the method further includes a step of receiving a MCS configuration including a list of indexes, wherein each index of the list indicates one set of MCS values.
  • the MCS configuration may be received via RRC signaling.
  • the MCS field in the single DCI has separate fields each indicating a MCS of one corresponding PDSCH or PUSCH among the multiple PDSCHs or PUSCHs, and the separate fields and the multiple PDSCHs or PUSCHs have an in-order one-to-one mapping relationship.
  • the MCS field in the single DCI has separate fields each indicating a MCS of one corresponding group of PDSCHs or PUSCHs among the multiple PDSCHs or PUSCHs, and the separate fields and groups of the PDSCHs or PUSCHs have an in-order one-to-one mapping relationship.
  • a total number of groups of the PDSCHs or PUSCHs is M/N
  • a number of the PDSCHs or PUSCHs in any one of the groups except a last group is equal to floor (K*N/M)
  • a number of the last grroup of PDSCHs or PUSCHs is equal to (K- (M/N-1) *L)
  • M is a size used in the MCS field
  • N is a required size to indicate a single MCS
  • K is a total number of the PDSCHs or PUSCH which are scheduled by the single DCI.
  • the single DCI includes a Redundancy version (RV) field, and the MCS field and the RV field in the single DCI are used together to indicate the MCSs for the multiple PDSCHs or PUSCHs.
  • RV Redundancy version
  • the method further includes a step of receiving a signaling for changing a MCS of one or more PDSCHs or PUSCHs among the multiple PDSCHs or PUSCHs. In another embodiment of the present application, the method further includes a step of changing a MCS of one or more PDSCHs or PUSCHs among the multiple PDSCHs or PUSCHs based on Hybrid Automatic Repeat request (HARQ) feedback.
  • HARQ Hybrid Automatic Repeat request
  • the field of MCS in DCI can indicate a set of MCS values
  • the number of MCS values within the set can be equal to the number of PDSCHs or PUSCHs, which means each of the PDSCHs or PUSCHs within the multiple PDSCHs or PUSCHs has a corresponding MCS indication
  • each MCS value within the set has an in-order one-to-one mapping to a corresponding PDSCH or PUSCH, e.g. the first value within the set of MCS values maps to the first PDSCH or PUSCH within the multiple PDSCHs or PUSCHs.
  • a MCS configuration list can be configured by gNB (e.g.
  • an index of the list can be indicated by the MCS field in DCI, wherein each index of the list includes one or more MCS values.
  • RRC Radio Resource Control
  • a configuration list of multiple MCSs is indicated by RRC signaling, as shown in Table 1.
  • Each index of the MCS configuration list includes one or more MCS values. When an index is indicated, then one or more MCS values are indicated. If the MCS field in DCI is indicated as “1” , then two MCS values are indicated for the multiple PDSCHs or PUSCHs, one MCS value is 16 and the other MCS value is 20.
  • the MCS field in DCI is indicated by an index of the list; otherwise, the MCS field in DCI is indicated one MCS index.
  • each MCS value represents a MCS index, for example, 1 means MCS1, 3 means MCS3, 6 means MCS6, 16 means MCS16, 20 means MCS20, etc.
  • the field of MCS in DCI can indicate a set of MCS values, the number of MCS values within the set can be large to the number of PDSCHs or PUSCHs, and each PDSCH or PUSCH within the multiple PDSCHs or PUSCHs has a corresponding MCS value, the valid MCS values correspond to the front parts of the multiple PDSCHs or PUSCHs.
  • the number of valid MCS values within the MCS set is equal to the number of PDSCHs or PUSCH (i.e., the valid MCS values are ⁇ 12, 15 ⁇ ) .
  • Each PDSCH or PUSCH within the multiple PDSCHs or PUSCHs have a corresponding MCS value, PDSCH1 with MCS12 or PUSCH1 with MCS12, PDSCH2 with MCS15 or PUSCH2 with MCS15.
  • the field of MCS in DCI can indicate a set of MCS values, the number of MCS values within the set can be small to the number of PDSCHs or PUSCHs, and each group of PDSCHs or PUSCHs within the multiple PDSCHs or PUSCHs has a corresponding MCS value.
  • the set of MCS values includes 2 values, e.g., ⁇ 12, 15 ⁇
  • the PDSCH1 and PDSCH2 can be grouped into group1
  • PDSCH3 and PDSCH4 can be grouped into group2
  • the MCS value of group 1 is 12
  • the MCS value of group 2 is 15.
  • the field of MCS in DCI is extended.
  • Each PDSCH or PUSCH within the multiple PDSCHs or PUSCHs has a separate field to indicate the MCS
  • the size of the extended MCS field is proportional to the number of PDSCHs or PUSCHs within the multiple PDSCHs or PUSCHs
  • the size of the MCS field is equal to N multiplied by the number of PDSCHs or PUSCHs
  • every N bits within the MCS field has an in-order one-to-one mapping with a corresponding PDSCH or PUSCH, where N is the size of MCS field in a DCI which schedules one PDSCH or PUSCH or one PDSCH or PUSCH with repetition. For example, as shown in FIG.
  • the MCS field in DCI should be extended to 20 bits, every 5 bits within the 20 bits indicates one MCS value of a PDSCH within the multiple PDSCHs, the MCS of PDSCH1 is indicated by the first N bits within the MCS field, the MCS of PDSCH2 is indicated by the second N bits within the MCS field, the MCS of the PDSCH3 is indicated by the third N bits within the MCS field, the MCS of the PDSCH4 is indicated by the forth N bits within the MCS field.
  • the field of MCS in DCI is extended.
  • Each group of the PDSCHs or PUSCHs within the multiple PDSCHs or PUSCHs has a separate field to indicate the MCS information. Large size of DCI will cause high blockage ratio and the reliability cannot be made sure, so the extension of MCS field in DCI should be limited.
  • the number of MCS values indicated by the MCS field is smaller than the number of PDSCHs or PUSCHs. More than one PDSCHs or PUSCHs within the multiple PDSCHs or PUSCHs should share a same MCS. With this approach, one set/group of the PDSCHs or PUSCHs sharing the same MCS should be determined.
  • the first group of PDSCHs is ⁇ PDSCH1, PDSCH2 ⁇ or the first group of PUSCHs is ⁇ PUSCH1, PUSCH2 ⁇
  • the second group of PDSCHs is ⁇ PDSCH3, PDSCH4, PDSCH5 ⁇ or the second group of PUSCHs is ⁇ PUSCH3, PUSCH 4, PUSCH 5 ⁇ .
  • the MCS of the first group of PDSCHs or PUSCHs is indicated by the first N bits within the MCS field in DCI, and the second group of PDSCHs or PUSCHs is indicated by the second N bits within the MCS field in DCI.
  • the group of PDSCHs or PUSCHs sharing a same MCS is pre-defined.
  • the group of PDSCHs or PUSCHs sharing a same MCS is indicated by Time Domain Resource Allocation (TDRA) .
  • TDRA Time Domain Resource Allocation
  • the repetition of a PDSCH or PUSCH shares the same MCS with the initial PDSCH or PUSCH.
  • the field of MCS in DCI is extended.
  • RV field can be reused for indicating of the MCS
  • the MCS field and RV field are used together to indicate the MCS of a plurality of PDSCHs or PUSCHs
  • Method 1 ⁇ 3 can be reused for detailed indication.
  • RV field is used for MCS indication
  • the RV index of the plurality of PDSCHs or PUSCHs is fixed as RV0.
  • the MCS of PDSCH or PUSCH can be changed by a signaling.
  • a MAC-CE or DCI or piggybacked DCI can be used to change the MCS of PDSCH (s) and a DCI can be used to change the MCS of PUSCH (s) .
  • a single DCI schedules multiple PDSCHs or PUSCHs all of the PDSCHs or PUSCHs share a same MCS if there is no MCS change signal received.
  • a signaling for changing the MCS of the PDSCH (s) or PUSCH (s) is received, which one of the PDSCH (s) or PUSCH (s) has change its MCS should be determined.
  • the time delay for using new MCS should be also determined.
  • a default way can be used for changing the MCS of PDSCH (s) or PUSCH (s) , the signaling just changes one PDSCH’s MCS, the PDSCH is the nearest PDSCH after the signaling or the PDSCH carrying the signaling.
  • a single DCI scheduling 4 PDSCHs when a signal (S1) for changing the MCS is received before PDSCH3, then the new MCS which is indicated by the S1 is used for PDSCH3 transmission.
  • a signal (S2) for changing the MCS is carried by PDSCH3, then the new MCS which is indicated by the S2 is used for PDSCH3 transmission.
  • a default way can be used for changing the MCS of PDSCH (s) or PUSCH (s) , the signaling will change the remaining PDSCHs’ MCS.
  • the remaining PDSCHs are from the nearest PDSCH after the signaling to the last PDSCH within the multiple PDSCHs or from the PDSCH carrying the signaling to the last PDSCH within the multiple PDSCHs.
  • which PDSCH should change the MCS is indicated by the signaling.
  • the last symbol of the signaling to the first symbol of the PUSCH (s) which changes the MCS should be large than a threshold value, where the threshold value can be pre-defined or configured.
  • the MCS of PDSCH or PUSCH can be changed associated with HARQ feedback. If the HARQ feedback of the previous PDSCH is NACK, then the MCS of next a set of PDSCHs should be changed and subtract a pre-defined step value, where the step value is large than 0. For instance, as shown in FIG. 6, a single DCI schedules 4 PDSCHs, denoted as PDSCH1, PDSCH2, PDSCH3 and PDSCH4, and the MCS indication in DCI is MCS16, the pre-defined step value is 1.
  • MCS of PDSCH3 and PDSCH 4 should be subtracted by the pre-defined step value and thus the MCS of PDSCH3 and PDSCH4 is 15.
  • the end of T0 to the start of first symbol of the PDSCH which change the MCS should be large than a value, where the value is a time unit, e.g. several number of symbols or slots or repetitions or ms or transmission occasions.
  • This disclosure proposes approaches to support a single DCI scheduling multiple PDSCHs or PUSCHs with Code Block Group (CBG) transmission.
  • the CBG-based transmission is one of the suitable ways to improve resource efficiency and reduce latency, which may be a key mechanism in large data rate and low latency scenario in wireless communication.
  • a combination of the CBG-based transmission and the single DCI scheduling multiple PDSCHs and PUSCHs is enabled, how to enable the combination of the CBG-based transmission and the single DCI scheduling multiple PDSCHs or PUSCHs should be determined.
  • a straightforward way is to indicate the combination by a RRC signaling.
  • the enabling signaling is configured, then a single DCI scheduling multiple PDSCHs or PUSCHs with the CBG-based transmission is enabled.
  • a single DCI scheduling multiple PDSCHs or PUSCHs with the CBG-based transmission When a single DCI scheduling multiple PDSCHs or PUSCHs with the CBG-based transmission is enabled, re-transmission should be determined in this case. In some circumstances, a single DCI scheduling multiple PDSCHs or PUSCHs with multiple CBGs for the re-transmission can be enabled. With this way, UE is not expected a single DCI scheduling multiple PDSCHs or PUSCHs would include both new transmission and re-transmission, and all of PxSCHs (PDSCHs or PUSCHs) scheduled by the single DCI is either new transmission or re-transmission.
  • UE When a current DCI indicates a same HARQ-ID as indicated by a previous DCI and a corresponding New data indicator (NDI) is not overturned, UE considers the transmission is a re-transmission. In some embodiments, when a current DCI indicates a same HARQ-ID as indicated by a previous DCI and any one NDI of the multiple PDSCHs or PUSCHs is not overturned, UE considers the transmission is a re-transmission, where the size of the NDI field is as the same as the NDI field size indicated by the previous DCI.
  • multiple PUCCH resources and corresponding HARQ feedback timing can be configured to UE, UE feedback HARQ-ACK information on the PUCCHs, all of the CBGs are divide into N groups, and each group of CBGs uses the same PUCCH to feedback HARQ-ACK information. In some cases, the number of N groups is equal to the number of PUCCH resources.
  • CBGs within multiple PDSCHs or PUSCHs and CBG subfields in DCI should also be determined.
  • the following approaches can be considered.
  • FIG. 7 is a flowchart of a wireless communication method according to a second embodiment of the present application.
  • the method 200 includes the following.
  • Step 210 by using the processor 11 cooperating with the transceiver 13, the UE 10 receives from the base station 20 a single Downlink Control Information (DCI) scheduling multiple Physical Downlink Share Channels (PDSCHs) or Physical Uplink Share Channels (PUSCHs) , wherein the single DCI includes a Code Block Group (CBG) field indicating all CBGs within the multiple PDSCHs or PUSCHs.
  • DCI Downlink Control Information
  • PDSCHs Physical Downlink Share Channels
  • PUSCHs Physical Uplink Share Channels
  • CBG Code Block Group
  • Step 220 by using the processor 11 cooperating with the transceiver 13, the UE 10 receives the multiple PDSCHs or transmits the multiple PUSCHs with CBG-based transmission.
  • the single DCI scheduling the multiple PDSCHs or PUSCHs with CBG-based transmission can reduce the latency and improve the resource efficiency.
  • the method further includes a step of receiving a signaling, which is used to enable the single DCI scheduling the multiple PDSCHs or PUSCHs with the CBG-based transmission or re-transmission.
  • the re-transmission is indicated if a current DCI indicates a same HARQ-ID as indicated by a previous DCI and a corresponding New Data Indicator (NDI) is not overturned.
  • NDI New Data Indicator
  • the re-transmission is indicated if a current DCI indicates a same HARQ-ID as indicated by a previous DCI and any one NDI of the multiple PDSCHs or PUSCHs is not overturned.
  • each of the multiple PDSCHs or PUSCHs corresponds to a same CBG indication in the CBG field of the single DCI. More specifically, a number of CBGs in each of the multiple PDSCHs or PUSCHs is equal to a minimum of a CBG size and a number of Code Blocks (CBs) of each PDSCH or PUSCH, in which the CBG size is determined based on a predetermined number of CBGs.
  • CBs Code Blocks
  • all CBs within the multiple PDSCHs or PUSCHs are considered as a whole part and are connected in order in the respect of CB indexes. More specifically, a number of CBs of each CBG is determined based on a size of the CBG field and total CBs within the multiple PDSCHs or PUSCHs.
  • a same size occupied in the CBG field of the single DCI is used for CBG indication for each of the multiple PDSCHs or PUSCHs.
  • a Modulation and Coding Scheme (MCS) of a first one of CBs in the CBG is used as the MCS of the CBG.
  • MCS Modulation and Coding Scheme
  • a CBG field in DCI can be used to indicate all CBGs within the multiple PDSCHs or PUSCHs, multiple CBGs of a PDSCH or PUSCH within multiple PDSCHs or PUSCHs share a same CBG subfield of the CBG field, it means each PDSCH or PUSCH within the multiple PDSCHs or PUSCHs corresponds to a same CBG indication, where the number of CBGs is equal to: min (CBG size, the number of CBs of each PDSCH or PUSCH) .
  • a single DCI scheduling 4 PDSCHs (denoted as PDSCH1, PDSCH2, PDSCH3, PDSCH4) , and the TB size (or the number of CBs) is different for each PDSCH, PDSCH1 has 16 CBs, PDSCH2 has 32 CBs, PDSCH3 has 6 CBs and PDSCH4 has 24 CBs, the CBG size (which is determined based on a predetermined number of CBGs) is configured as 8, then for PDSCH1, it includes 8CBGs in total and each CBG has 2CBs, for PDSCH2, it includes 8CBGs in total and each CBG has 4CBs, for PDSCH3, it includes 6CBGs in total and each CBG has 1CB, for PDSCH4, it includes 8CBGs in total and each CBG has 3CBs.
  • the actual TB size for each PDSCH or PUSCH will be not the same due to different time domain resources or MCS values for each PDSCH or PUSCH within the multiple PDSCHs or PUSCHs.
  • the number of CBs of a PDSCH or PUSCH within the multiple PDSCHs or PUSCHs will be different (if a TB is more than a threshold, then the TB should be segmented) .
  • the number of CBGs or the CBG subfield size configuration is based on a maximum of the number of CBs in each PDSCH or PUSCH within the multiple PDSCHs or PUSCHs.
  • a CBG field in DCI can be used to indicate all CBGs within the multiple PDSCHs and PUSCHs, connect all of the CBs within the multiple PDSCHs or PUSCHs, which are considered as a whole part (e.g. denoted as total CBs) , and are connected in order in the respect of CB indexes.
  • the number of CBs of each CBG is substantially the same.
  • the number of CBs of a CBG is determined based on the CBG field size and the total CBs within the multiple PDSCHs or PUSCHs. For instance (based on PDSCH transmission) , as shown in FIG.
  • a single DCI scheduling 4 PDSCHs (denoted as PDSCH1, PDSCH2, PDSCH3, PDSCH4) and each PDSCH within the multiple PDSCHs have a same or different CBs
  • PDSCH1 includes 3CBs
  • PDSCH2 includes 3CBs
  • PDSCH3 includes 5CBs
  • PDSCH4 includes 5CBs
  • the indexes of all CBs are from CB1 to CB16
  • CBG1 includes CB1 to CB4
  • CBG2 includes CB5 to CB8
  • CBG3 includes CB9 to CB12
  • CBG4 includes CB13 to CB16.
  • the first 1 bit in CBG indication field indicates CBG1, the second 1 bit in CBG indication field indicates CBG2, the third 1 bit in CBG indication field indicates CBG3, the fourth 1 bit in CBG indication field indicates CBG4.
  • the CBG field size is extended.
  • Each PDSCH or PUSCH within multiple PDSCHs or PUSCHs has a same size for CBG indication, if a PDSCH’s or PUSCH’s CBG needs N bits to indicate, then the total CBG field size is: N*M bits, where M is the number of PDSCHs or PUSCHs which are scheduled by a single DCI.
  • the RV field in DCI can be used for CBG indication, the CBG field and RV field are connected, and the connected field can be used for CBG indication.
  • the RV of each PDSCH or PUSCH within the multiple PDSCHs or PUSCHs is fixed to RV0.
  • the MCS of the CBG is based on the first CB of the CBG, the MCS of the first CB is used for the CBG.
  • the CBG when a single DCI scheduling multiple PDSCH or PUSCH transmissions with CBG, if a CBG pans different PDSCHs or PUSCHs, the CBG may have different MCSs, parts of CBs within the CBG use MCS A, the remaining CBs within the CBG use MCS B.
  • Some embodiments of the present application are a combination of “techniques/processes” that can be adopted in 3GPP specification to create an end product. Some embodiments of the present application could be adopted in the 5G NR unlicensed band communications. Some embodiments of the present application propose technical mechanisms.
  • the embodiment of the present application further provides a computer readable storage medium for storing a computer program.
  • the computer readable storage medium enables a computer to execute corresponding processes implemented by the UE/BS in each of the methods of the embodiment of the present application. For brevity, details will not be described herein again.
  • the embodiment of the present application further provides a computer program product including computer program instructions.
  • the computer program product enables a computer to execute corresponding processes implemented by the UE/BS in each of the methods of the embodiment of the present application. For brevity, details will not be described herein again.
  • the embodiment of the present application further provides a computer program.
  • the computer program enables a computer to execute corresponding processes implemented by the UE/BS in each of the methods of the embodiment of the present application. For brevity, details will not be described herein again.

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Abstract

L'invention concerne un procédé de communication sans fil et des dispositifs associés. Le procédé, réalisé par un équipement d'utilisateur (UE), inclut la réception d'une seule information de commande de liaison descendante (DCI) programmant de multiples canaux physiques partagés de liaison descendante (PDSCH) ou de multiples canaux physiques partagés de liaison montante (PUSCH), la seule information DCI comprenant un champ Schéma de modulation et de codage (MCS) indiquant des schémas MCS identiques ou différents pour les multiples canaux PDSCH ou PUSCH; et la réception des multiples canaux PDSCH ou la transmission des multiples canaux PUSCH avec les schémas MCS identiques ou différents. Avec ce procédé, la seule information DCI programmant les multiples canaux PDSCH ou PUSCH avec différents schémas MCS peut s'adapter à la grande taille de paquets et à de multiples flux de services XR.
PCT/CN2022/112153 2022-08-12 2022-08-12 Procédé de communication sans fil et dispositifs associés Ceased WO2024031646A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220086894A1 (en) * 2020-09-14 2022-03-17 Samsung Electronics Co., Ltd. Multi-cell scheduling with reduced control overhead
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Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
US20220086894A1 (en) * 2020-09-14 2022-03-17 Samsung Electronics Co., Ltd. Multi-cell scheduling with reduced control overhead
CN114885431A (zh) * 2022-03-31 2022-08-09 华为技术有限公司 一种通信方法及装置

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QUALCOMM INCORPORATED: "Capacity Enhancement Techniques for XR", 3GPP DRAFT; R1-2205056, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20220509 - 20220520, 29 April 2022 (2022-04-29), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052191717 *
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