WO2021164682A1 - Procédés et appareil d'attribution de ressources pour rétroaction harq pour prendre en charge une transmission de multidiffusion - Google Patents

Procédés et appareil d'attribution de ressources pour rétroaction harq pour prendre en charge une transmission de multidiffusion Download PDF

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WO2021164682A1
WO2021164682A1 PCT/CN2021/076498 CN2021076498W WO2021164682A1 WO 2021164682 A1 WO2021164682 A1 WO 2021164682A1 CN 2021076498 W CN2021076498 W CN 2021076498W WO 2021164682 A1 WO2021164682 A1 WO 2021164682A1
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pucch
feedback
resource
multicast
resources
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PCT/CN2021/076498
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English (en)
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Xuelong Wang
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Mediatek Singapore Pte. Ltd.
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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
    • H04L1/12—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
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • 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
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0093—Point-to-multipoint
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services

Definitions

  • the disclosed embodiments relate generally to wireless communication, and, more particularly, to resource assignment for hybrid automatic repeat request (HARQ) feedback to support multicast transmission.
  • HARQ hybrid automatic repeat request
  • Initial wireless multicast/broadcast services include streaming services such as mobile TV and IPTV.
  • streaming services such as mobile TV and IPTV.
  • recent application development for mobile multicast services requires highly robust and critical communication services such as group communication in disaster situations and the necessity of public safety network-related multicast services.
  • the early 3GPP in the LTE standard defines enhanced multimedia broadcast multicast services eMBMS.
  • the single-cell point to multipoint (SC-PTM) services and multicast-broadcast single-frequency network (MBSFN) are defined.
  • the early multicast/broadcast services such as mobile TV services, do not require ACK/NACK-based feedback for the multicast data packets.
  • the group scheduling which is based on UMTS or EUTRAN technology, has no uplink feedback support.
  • One of the major issues for NR multicast uplink feedback support is the resource allocation.
  • the traditional HARQ resource allocation for unicast does not work for the multicast service.
  • Improvements and enhancements are required for resource assignment for HARQ feedback to support multicast transmission.
  • the gNB assigns a unique index to each of the PUCCH resource or PUCCH resource instances for the feedback of multicast PDSCH transmission.
  • the numbering of the index for the whole feedback resources are configured.
  • the uplink feedback resource is configured with one or more elements comprising subframe or slot index, starting index of PUCCH resources or PUCCH resource instances, and the number of PUCCH resources or PUCCH resource instances.
  • the gNB explicitly indicate the set of PUCCH resources or PUCCH resource instances via RRC message e.g. MCCH Configuration.
  • the set of PUCCH resources or PUCCH resource instances is indicated to UE via multicast DCI.
  • the gNB indicates one unique HARQ feedback resource index to each UE joining the reception of each multicast service for a particular multicast radio bearer.
  • a list of HARQ Feedback index is indicated to the UE.
  • One or a list of HARQ feedback index is configured to the UE via unicast signalling e.g. RRC Reconfiguration.
  • the UE uses the unique HARQ Feedback Resource index, the indicated resource set of PUCCH resource or PUCCH resource instance, and the configured numbering of the whole feedback resource to determine the actual PUCCH resource or PUCCH resource instance for its uplink feedback resource for a particular multicast PDSCH transmission.
  • the UE receives an uplink feedback resource configuration with physical uplink control channel (PUCCH) feedback resources configured for one or more physical downlink shared channel (PDSCH) multicast transmissions from a new radio (NR) network, wherein the uplink feedback resource configuration assigns a unique resource index to each configured PUCCH feedback resource and includes an uplink feedback type indicator, receives one or more PDSCH multicast transmissions in the NR network, identifies one or more UE feedback resources allocated for the UE based on the uplink feedback resource configuration, and sends uplink feedbacks for the received one or more multicast transmissions using the identified one or more corresponding UE feedback resources.
  • the uplink feedback type indicator indicates a NACK-only HARQ.
  • the uplink feedback type indicator indicates a NACK/ACK HARQ.
  • the configured PUCCH feedback resources occupy multiple timeslots of the PUCCH.
  • the uplink feedback configuration is received on a radio resource control (RRC) message that configures numberings of all unique resource indexes for all PUCCH feedback resources for multicast services.
  • RRC radio resource control
  • a set of PUCCH feedback resources are explicitly configured in a RRC message for the one or more multicast transmissions received by the UE, wherein each multicast transmission corresponds to one multicast traffic channel (MTCH) .
  • MTCH multicast traffic channel
  • the set of PUCCH feedback resources are configured by one or more elements comprising a subframe index, a slot index, a starting index of PUCCH resources, and a number of PUCCH resources.
  • the uplink feedback resource configuration is received on a multicast downlink control information (DCI) .
  • the one or more UE feedback resources are identified by one or more unique HARQ indexes for corresponding received PDSCH multicast transmissions, and wherein the one or more unique HARQ indexes are indicated in a unicast signaling from the NR network.
  • the PUCCH feedback resource is a PUCCH resource.
  • the PUCCH feedback resource is a PUCCH resource instance.
  • Figure 1 is a schematic system diagram illustrating an exemplary NR wireless network that supports resource assignment for HARQ feedback to support multicast transmission in accordance with embodiments of the current invention.
  • Figure 2 illustrates an exemplary NR wireless system with centralized upper layers of the NR radio interface stacks and UE stack with multicast protocol in accordance with embodiments of the current invention.
  • Figure 3 illustrates an exemplary diagram for different multicast HARQ options and configurations in the NR network in accordance with embodiments of the current invention.
  • Figure 4 illustrates an exemplary NR multicast PUCCH resource set in accordance with embodiments of the current invention.
  • Figure 5 illustrates an exemplary intra-slot PUCCH Resource allocation for NR multicast in accordance with embodiments of the current invention.
  • Figure 6 illustrates an exemplary inter-slot PUCCH Resource allocation for NR multicast in accordance with embodiments of the current invention.
  • Figure 7 illustrates an exemplary numbering for PUCCH Resource or PUCCH Resource instance for NR multicast in accordance with embodiments of the current invention.
  • Figure 8 illustrates exemplary diagrams of UE identifying UE PUCCH feedback resources with mappings between HARQ feedback resource index and PUCCH resource/resource instance for NR multicast services in accordance with embodiments of the current invention.
  • Figure 9 illustrates an exemplary flow chart for resource assignment for HARQ feedback to support multicast transmission in accordance with embodiments of the current invention.
  • HARQ-ACK feedback for unicast transmission is supported. Multiple DL HARQ Process per UE is supported. Single DL HARQ Process per UE is supported as well.
  • the UE is required to indicate its capability of minimum HARQ processing time, which is the minimum HARQ processing time required from DL data reception to the corresponding HARQ-ACK transmission.
  • HARQ ACK/NACK feedback for multiple physical downlink shared channels (PDSCHs) PDSCH in time can be transmitted in one UL data/control region.
  • the timing between the PDSCH reception and corresponding ACK/NACK is specified in DCI (e.g. in DCI 1_0, DCI 1_1) .
  • CBG Code Block Group
  • a CBG can include all CBs of a TB regardless of the TBS (TB Size) .
  • a TB is made up of only one CBG.
  • the UE reports single HARQ ACK bit for the TB.
  • a CBG can have only one CB.
  • CBG granularity is configurable by higher layer.
  • the HARQ-ACK codebook is used for the NR network. There is the CBG-based HARQ-ACK codebook determination. Two different types of Codebook determination algorithm called Type 1 and Type 2 are available for the NR network.
  • NR-V2X supports HARQ based on transmission of ACK/NACK (or DTX) for Sidelink unicast and groupcast services, as well as a NACK-only HARQ scheme particular to groupcast services. In addition, it supports blind re-transmission schemes.
  • Sidelink HARQ feedback is carried on physical sidelink feedback channel (PSFCH) from an Rx UE to its Tx UE.
  • PSFCH physical sidelink feedback channel
  • the ACK/NACK is delivered based on the success or failure of the whole transport block.
  • the NACK-only operation is defined for groupcast to allow a potentially lower sidelink resource demand to be created when a larger number of Rx UEs that need to send feedback to the same Tx UE.
  • Sidelink groupcast has the similar characteristics as NR Multicast services.
  • FIG. 1 is a schematic system diagram illustrating an exemplary NR wireless network that supports resource assignment for HARQ feedback to support multicast transmission in accordance with embodiments of the current invention.
  • the NR wireless system includes one or more fixed base infrastructure units forming a network distributed over a geographical region.
  • the base unit may also be referred to as an access point, an access terminal, a base station, a Node-B, an eNode-B (eNB) , a gNB, or by other terminology used in the art.
  • the network can be homogeneous network or heterogeneous network, which can be deployed with the same frequency or different frequency.
  • gNB 101 and gNB 102 base stations in the NR network, the serving area of which may or may not overlap with each other.
  • the backhaul connection such as 136, connects the non-co-located receiving base units, such as gNB 101 and gNB 102. These backhaul connections can be either ideal or non-ideal.
  • gNB 101 connects with gNB 102 via Xnr interface 136.
  • NR wireless network 100 also includes multiple communication devices or mobile stations, such as user equipments (UEs) 111, 112, 113, 114, 116, 117, 121 and 122.
  • the mobile devices can establish one or more unicast connections with one or more base stations.
  • UE 111 has unicast connect 131 with gNB 101.
  • UEs 114 and 117 connect with gNB 101 with unicast connections 134 and 133, respectively.
  • UEs 121 connects with gNB 102 with unicast connections 132.
  • uplink feedback resources are configured on physical uplink control channel (PUCCH) .
  • PUCCH physical uplink control channel
  • One or more consecutive timeslots are configured to carry the NACK/ACK uplink feedback for UEs receiving one or more multicast services.
  • the gNB supports one or more multicast services.
  • the multicast service can be supported by one or more gNBs.
  • Uplink feedback resources on PUCCH are configured to support one or more multicast services for one or more UEs.
  • a multicast service-1 is provided by gNB 101 and gNB 102.
  • UEs 111, 112 and 113 receive multicast services from gNB 101.
  • UEs 121 and 122 receive multicast services from gNB 102.
  • Multicast service-2 is provided by gNB 101 to the UE group of UEs 116, 117, and 118.
  • UE 111 receives multicast service-1 from gNB 101.
  • gNB 102 provides multicast service-1 as well.
  • Uplink feedback are configured for the multicast services. Each UE receiving the multicast indicates whether the HARQ is supported. An indication the type of the uplink feedback is also configured.
  • the uplink feedback is a NACK-only feedback. In another embodiment, the uplink feedback is a NACK and ACK-based feedback.
  • Figure 1 illustrates an exemplary procedure 180 for uplink feedback resource allocation for UE.
  • the UE receives uplink feedback resource configuration for all PUCCH feedback resources.
  • a PUCCH feedback resource is a PUCCH resource.
  • a PUCCH feedback resource is a PUCCH resource instance. The entire available PUCCH feedback resources are numbered.
  • one or more sets PUCCH feedback resources are allocated for each multicast services.
  • the UE receives a resource for each multicast services it joins. The UE determines each uplink feedback resource for corresponding multicast service based on the configurations.
  • Figure 1 further illustrates simplified block diagrams of a base station and a mobile device/UE for uplink feedback resource assignment for HARQ feedback to support multicast transmission.
  • gNB 102 has an antenna 156, which transmits and receives radio signals.
  • An RF transceiver circuit 153 coupled with the antenna, receives RF signals from antenna 156, converts them to baseband signals, and sends them to processor 152.
  • RF transceiver 153 also converts received baseband signals from processor 152, converts them to RF signals, and sends out to antenna 156.
  • Processor 152 processes the received baseband signals and invokes different functional modules to perform features in gNB 102.
  • Memory 151 stores program instructions and data 154 to control the operations of gNB 102.
  • gNB 102 also includes a set of control modules 155 that carry out functional tasks to communicate with mobile stations.
  • Figure 1 also includes simplified block diagrams of a, such as UE 111.
  • the UE has an antenna 165, which transmits and receives radio signals.
  • the RF transceiver may comprise two RF modules (not shown) .
  • a first RF module is used for HF transmitting and receiving, and the other RF module is used for different frequency bands transmitting and receiving which is different from the HF transceiver.
  • RF transceiver 163 also converts received baseband signals from processor 162, converts them to RF signals, and sends out to antenna 165.
  • Processor 162 processes the received baseband signals and invokes different functional modules to perform features in the UE 111.
  • Memory 161 stores program instructions and data 164 to control the operations of the UE 111.
  • Antenna 165 sends uplink transmission and receives downlink transmissions to/from antenna 156 of gNB 102.
  • the UE also includes a set of control modules that carry out functional tasks. These control modules can be implemented by circuits, software, firmware, or a combination of them.
  • a feedback resource module 191 receives an uplink feedback resource configuration with physical uplink control channel (PUCCH) feedback resources configured for one or more physical downlink shared channel (PDSCH) multicast transmissions from the NR network, wherein the uplink feedback resource configuration assigns a unique resource index to each configured PUCCH feedback resource and includes an uplink feedback type indicator.
  • a multicast receiver 192 receives one or more PDSCH multicast transmissions in the NR network.
  • An identification module 193 identifies one or more UE feedback resources allocated for the UE based on the uplink feedback resource configuration.
  • An uplink feedback module 194 sends uplink feedbacks for the received one or more multicast transmissions using the identified one or more corresponding UE feedback resources.
  • Figure 2 illustrates an exemplary NR wireless system with centralized upper layers of the NR radio interface stacks and UE stack with multicast protocol in accordance with embodiments of the current invention.
  • Different protocol split options between central unit (CU) and distributed unit (DU) of gNB nodes may be possible.
  • the functional split between the CU and DU of gNB nodes may depend on the transport layer.
  • Low performance transport between the CU and DU of gNB nodes can enable the higher protocol layers of the NR radio stacks to be supported in the CU, since the higher protocol layers have lower performance requirements on the transport layer in terms of bandwidth, delay, synchronization and jitter.
  • SDAP and PDCP layer are located in the CU, while RLC, MAC and PHY layers are located in the DU.
  • a core unit 201 is connected with one central unit 211 with gNB upper layer 252.
  • gNB upper layer 252 includes the PDCP layer and optionally the SDAP layer.
  • Central unit 211 connects with distributed units 221, 222, and 221.
  • Distributed units 221, 222, and 223 each corresponds to a cell 231, 232, and 233, respectively.
  • the DUs, such as 221, 222 and 223 includes gNB lower layers 251.
  • gNB lower layers 251 include the PHY, MAC and the RLC layers.
  • each gNB has the protocol stacks 261 including SDAP, PDCP, RLC, MAC and PHY layers.
  • NR multicast is transmitted in the coverage of a cell.
  • One multicast control channel (MCCH) and one or more multicast traffic channels MTCH (s) are mapped on downlink shared channel (DL-SCH) .
  • the scheduling for NR multicast is done by the gNB-CU.
  • MCCH provides the list of all NR multicast services with ongoing sessions transmitted on MTCH (s) , including each NR multicast service ID (expressed by NR multicast group ID or NR multicast session ID) , associated G-RNTI, scheduling information, etc.
  • the MCCH is transmitted by RRC message for every MCCH repetition period
  • the MCCH uses a modification period.
  • MCCH and MTCH use the RLC-UM mode or RLC-AM mode.
  • the MCCH is scheduled by the gNB in the common search space (CSS) of PDCCH with MB-RNTI scrambled.
  • MB-RNTI is MCCH logical channel specific RNTI, with fixed value specified in MAC (e.g., the value can be FFFD) .
  • MTCH is scheduled by gNB in the common search space of PDCCH with G-RNTI scrambled.
  • UE decodes the MTCH data for a multicast session in PDSCH according to the resource indicated by DCI.
  • FIG. 3 illustrates an exemplary diagram for different multicast HARQ options and configurations in the NR network in accordance with embodiments of the current invention.
  • Multicast feedback 301 in the NR system has two HARQ feedback options, the NACK-only HARQ option 311, and the ACK and NACK HARQ option 312.
  • a concrete feedback resource is used at step 321.
  • ACK and NACK HARQ option 312 a set of PUCCH feedback resources are allocated at step 322.
  • intra-slot multiple multicast services are configured.
  • inter-slot PUCCH feedback resources are configured for multiple UEs.
  • the UE identifies corresponding PUCCH resource or PUCCH resource instance for each multicast transmissions received.
  • NACK-only HARQ option 311 all UEs receiving the multicast data shares a single feedback resource in a physical channel (e.g. PUCCH) , and only feedback HARQ NACK over the feedback resource.
  • a physical channel e.g. PUCCH
  • all the UEs transmit NACK in single frequency network (SFN) manner.
  • SFN single frequency network
  • option 312-based HARQ feedback the UEs receiving the multicast data utilize separate feedback resource in a physical channel (e.g. PUCCH) for uplink feedback. In this case, a set of orthogonal feedback resource is used by the UEs.
  • Multicast DCI 330 can include HARQ related information including both HARQ transmission information and HARQ feedback related information.
  • a new field 331 to enable HARQ feedback is added into multicast DCI to indicate the feedback request for the corresponding multicast physical downlink shared channel (PDSCH) transmission.
  • a new field 341 to indicate the HARQ feedback option is added into multicast DCI to indicate the feedback option for the corresponding multicast PDSCH transmission if the HARQ feedback is enabled for multicast PDSCH transmission.
  • the PUCCH) feedback resource can also be indicated in multicast DCI for multicast PDSCH transmission, if the HARQ feedback is enabled for multicast PDSCH transmission.
  • the HARQ feedback timing information within multicast DCI for multicast include a duration 352 occupying one or a plural of consecutive subframe or slot. The reason is that the uplink feedback resource within subframe or slot may not be enough to support the HARQ feedback from all UEs that receive the multicast PDSCH transmission.
  • multicast DCI can hold the PUCCH resource indicator indicating the PUCCH resource for uplink feedback.
  • multicast DCI can include one or a set of specific PUCCH resource or PUCCH resource instance for uplink feedback of multicast PDSCH transmission depending on the HARQ feedback option.
  • the PUCCH resource indicator within multicast DCI has different mean for the two HARQ feedback options.
  • the PUCCH resource indicator 321 indicates a concrete PUCCH resource as unicast DCI (e.g., format 1_0) does, or a concrete PUCCH resource instance (with fixed cyclic shift) .
  • the PUCCH resource indicator 322 indicates a set of PUCCH resource (e.g., 8 PUCCH resources) or a set of PUCCH resource instance (e.g., 16 PUCCH resource instance) .
  • the concept of PUCCH resource instance is introduced with the indication of a particular PUCCH resource associated with a specific cyclic shift. For example, for a particular PUCCH resource, if there are three cyclic shifts configured by gNB (as specified in TS 38.213) , there are three PUCCH resource instances. When the cyclic shift pairs is not configured for a PUCCH resource, this PUCCH resource is identical to PUCCH resource instance.
  • the methods described within the present disclosure based on PUCCH resource instance is applicable to PUCCH resource.
  • the uplink (PUCCH) feedback resource means PUCCH resource, PUCCH resource instance, or their combination.
  • PUCCH feedback resources for NR multicast feedback needs to be defined in physical layer.
  • PUCCH feedback resources for NR multicast feedback is defined in terms of starting PRB ID, hopping PRB, supported UCI format, etc.
  • FIG. 4 illustrates an exemplary NR multicast PUCCH resource set in accordance with embodiments of the current invention.
  • Sixteen PUCCH Resources are defined for NR multicast feedback.
  • Each PUCCH Resource spans two sysmbols, as 411, 412, 421, and 422, and two PRBs, as 403 and 404.
  • the hopping PRB should be also defined.
  • One PUCCH Resource include multiple PUCCH Resource instance, each with a different cyclic shift.
  • the number of Cyclic Shift pairs for the PUCCH resource is k 0 , k 1 , ..., k 15 , and then ⁇ (k 0 + k 1 ...+ 15 ) is the sum of the usable PUCCH resource instances.
  • the sum of the usable PUCCH resource instance puts a limitation on the maximum number of the UEs or users that can concurrently provide HARQ feedback via second HARQ feedback option to one or multiple multicast PDSCH transmission (s) during the same period e.g. within one or multiple slot (s) or subframe (s) .
  • the period for the limitation is subject to the period for defining the PUCCH resources for NR multicast feedback.
  • one slot such as slot 401 and slot 402
  • slot 401 and slot 402 are used for HARQ feedback
  • each PUCCH instances assigned to one UE only sixty-four UEs or users can provide the ACK/NACK HARQ feedback option to one or multiple multicast PDSCH transmission (s) during the same slot. More generally, assuming there are W concurrent multicast PDSCH transmissions and the number of the UEs for the different multicast PDSCH transmission are g 0 , g 1 , ..., and g W-1 , then the required uplink feedback resource is ⁇ (g 0 +g 1 ...+g W-1 ) .
  • the second HARQ feedback option can apply only if ⁇ (g 0 +g 1 ...+g W-1 ) ⁇ ⁇ (k 0 + k 1 ...+ k 15 ) (in the exmaple it is sixty four) . If ⁇ (g 0 +g 1 ...+g W-1 ) > ⁇ (k 0 + k 1 ...+ k 15 ) , the ACK/NACK HARQ feedback option does not work because some of the UEs has no feedback resource to report HARQ ACK/NACK. There are two ways to handle the problem. The first is to disable the ACK/NACK HARQ feedback option. Therefore, no HARQ feedback is supported or the the NACK-only HARQ feedback option is used instead. The second is to delay the ACK/NACK HARQ option based HARQ feedback to the succeeding slots or subframes.
  • Figure 5 illustrates an exemplary intra-slot PUCCH resource allocation for NR multicast in accordance with embodiments of the current invention.
  • Two sets of PUCCH resources or PUCCH resource instances 511 and 512 are allocated at slot n 501 corresponding to two different multicast PDSCH transmission (e.g., occur at slot n-a with a as the slot numbers between multicast PDSCH transmission and feedback resource slot n) .
  • the set of feedback resources allocated for the multicast servcie#1 of PDSCH transmission includes forty-eight PUCCH resources or PUCCH resource instances (i.e. numbering from #0 to #47) .
  • the set of feedback resource allocated for multicast service#2 of PDSCH transmission includes eight PUCCH resources or PUCCH resource instances (i.e. numbering from #56 to #63) .
  • the immediate adjacent slot n+1 502 are not configured with PUCCH feedback resources.
  • Figure 6 illustrates an exemplary inter-slot PUCCH resource allocation for NR multicast in accordance with embodiments of the current invention.
  • One set of PUCCH resources or PUCCH resource instances 611 is allocated spanning both slot n 601 and slot n+1 602 corresponding to a single multicast PDSCH transmission for multicast service#1 (e.g., occur at slot n-a with a as the slot numbers between multicast PDSCH transmission and feedback resource slot n) .
  • the set of feedback resource allocated for the multicast PDSCH transmission includes the whole sixty-four PUCCH resources or PUCCH resource instances within slot n and thirty-two PUCCH resources or PUCCH resource instances within slot n+1 (i.e. numbering from #0 to #31) .
  • Figure 7 illustrates an exemplary numbering for PUCCH resource or PUCCH resource instance for NR multicast in accordance with embodiments of the current invention.
  • the sixteen PUCCH resources 701 are allocated for slot n, each with specific cyclic shift pairs, as in cyclic shift number 702.
  • the numbering of PUCCH Resource instance starts from the PUCCH resource with the smallest index.
  • the PUCCH resource instance index 703 with the first cyclic shift of cyclic shift pairs takes the smallest index of PUCCH resource instance.
  • the index of PUCCH resource instance takes sequntial number from the first PUCCH resource to the last PUCCH resource (i.e. from zero to fifteen) .
  • all of the PUCCH resources or PUCCH resource instances for the feedback of multicast PDSCH transmission has a unique index assigned by the base station/gNB.
  • the numbering of the index for the whole feedback resources (i.e. PUCCH resource or PUCCH resource instance) during uplink feedback resource period and the configuration of the feedback resources (i.e. PUCCH Resource or PUCCH Resource instance) is indicated to the UE via RRC message (e.g. in system information) .
  • the uplink feedback resource period assigned for multicast PDSCH transmission can be one slot, one subframe, mulitple consecutive slots or mulitple consecutive subframes. In a typical implementation in NR, it is one slot. For exmaple, if one slot supports sixty-four PUCCH Resources or PUCCH Resource instances, the index is from #0 to #63.
  • the set of PUCCH resource or PUCCH resource instance allocated for multicast PDSCH transmission can be indicated as a combination of slot index, starting index of PUCCH resources or PUCCH resource instances, and number of PUCCH resources or PUCCH resource instances (i.e. the consecutive PUCCH resources or PUCCH resource instances occupied) .
  • its allocated feedback resource is in slot n
  • starting index of PUCCH resources or PUCCH resource instances is zero
  • number of PUCCH resources or PUCCH resource instances are forty-eight.
  • a simple 3-tuple expression can be used, e.g.
  • the allocated feedback resource for the multicast PDSCH transmission in figure 6 is ⁇ (k, 0, 64) , (k+1, 56, 8) ⁇ .
  • one or multiple combinaiton (s) of subframe or slot index, starting index of PUCCH resources or PUCCH resource instances, and number of PUCCH resources or PUCCH resource instances is indicated to UE (s) .
  • one or multiple combinaiton (s) of subframe or slot index, starting index of PUCCH resources or PUCCH resource instances, and number of PUCCH resources or PUCCH resource instances is used to describe a particular set of uplink feedback resource.
  • One resource set is corresponding to one multicast PDSCH transmission. If a UE is receiving mulitple multicast PDSCH transmission, the UE can receive multiple resource sets.
  • this type of resource inidcation can be used to indicate a particular PUCCH resources or PUCCH resource instances for first option based HARQ feedback.
  • the base station can explictly indicate the said resource set of PUCCH resources or PUCCH resource instances via RRC message.
  • the RRC message that carries the specific set of PUCCH resource /PUCCH resource instances is the MCCH Configuration to the UEs receiving the multicast PDSCH transmission, which is cooresponding to one MTCH transmission.
  • the set of PUCCH resources or PUCCH resource instances is indicated to UE via multicast DCI.
  • one or a plural of 3-tuple is used for the indication depending on how long the HARQ feedback lasts (i.e., within one subframe or slot, or multiple consecutive subframes or slots) .
  • UE can directly use the starting index of PUCCH resources or PUCCH resource instances, and number of PUCCH resources or PUCCH resource instances to locate the PUCCH resources or PUCCH resource instances.
  • UE further numbers the set of PUCCH resources or PUCCH resource instances from #0 by a Resource Index. For exmaple if there are eight PUCCH resource instances configured (occupied No. 56-63 among the whole sisty-four instances) , the UE numbers #56 PUCCH resource instance with Resource Index #0, and numbers #63 PUCCH resource instance with Resource Index #7. Then the Resource Index is from #0 to #7.
  • the same Resource index numbering is performed by Base Station also and it is stored as a context for multicast PDSCH transmission.
  • UE can sequencially use the starting index of PUCCH resources or PUCCH resource instances, and number of PUCCH resources or PUCCH resource instances within the uplink feedback resource periods to locate the PUCCH resources or PUCCH resource instances one period by one period. Starting from the first uplink feedback resource period to the last uplink feedback resource period within the set, UE further numbers the set of PUCCH resources or PUCCH resource instances from #0 by a Resource Index. For exmaple, if two consecutive slots are included within the resource set, and if there are eight PUCCH resource instances configured for the first slot (occupied No.
  • the UE firstly numbers #56 PUCCH resource instance within the first slot with Resource Index #0, and numbers #63 PUCCH resource instance within the first slot with Resource Index #7.
  • the UE secondly numbers #0 PUCCH resource instance within the second slot with Resource index #8, and numbers #5 PUCCH resource instance within the second slot with Resource Index #13. Then the Resource Index is from #0 to #13.
  • the same Resource index numbering is performed by Base Station also and it is stored as a context for multicast PDSCH transmission.
  • non consecutive allocation of PUCCH resources or PUCCH resource instances for feedback of multicast PDSCH transmission within a uplink feedback resource period is supported with benefit to avoid the generation of resource hole.
  • the HARQ feedback timing is implictly included, then no additonal HARQ feedback timing (as known as the K value in legacy NR system) is informed to the UEs.
  • mulitple HARQ feedback timings are indicated to the UEs, each with a separate subset of the resource set for the particular subframe (s) or slot (s) . It can be indicated to the UEs via RRC message, MAC CE or multicast DCI.
  • the HARQ feedback timing is implictly included, then no additonal HARQ feedback timing (as known as the K value in legacy NR system) is informed to the UEs.
  • mulitple HARQ feedback timings are indicated to the UEs, each with a separate subset of the resource set for the particular subframe (s) or slot (s) . It can be indicated to the UEs via RRC message, MAC CE or multicast DCI.
  • the UEs particpating the multicast service receive the allocated set of PUCCH resources or PUCCH resource instances, the UEs can determine the actual PUCCH resource or PUCCH resource instance for their separate HARQ feedback in explict way or implict way for second option based HARQ feedback.
  • the Base Station allocates one unique Resource Index from the stored context for multicast PDSCH transmission for for each RRC_Connected UE that attempts to join the reception of the multicast service (i.e. receiving the multicast PDSCH transmission) over each MTCH. Then Base Station update the stored context for multicast PDSCH transmission with C-RNTI of the UE associated with new allocated Resource Index for UE uplink feedback for the multicast PDSCH transmission.
  • the base station /gNB indicates one unique (HARQ feedback) resource index to each UE joining the reception of the multicast service for a particular multicast radio bearer.
  • a list of HARQ feedback Resource index is indicated to the UE.
  • One or a list of HARQ feedback Resource Index is configured to the UE via unicast signalling e.g. RRC Reconfiguration or MAC CE.
  • the HARQ feedback Resource Index information can be indicated to UE via a DCI used for unicast PDSCH transmission.
  • the UE uses the (HARQ feedback) unique resource index to locate the actual PUCCH resource or PUCCH resource instance within the configured resource set of PUCCH resources or PUCCH resource instances for a multicast PDSCH transmission.
  • the Base Station allocates exact same number of PUCCH resources or PUCCH resource instances, as the number of the users joining the reception of the multicast service for a particular multicast Radio Bearer, which mapps to a single MTCH logical channel. Alternatively the Base Station may allocates more PUCCH resources or PUCCH resource instances than the number of the users joining the reception of the multicast service for multicast PDSCH transmission to allow some flexiblity.
  • UE uses the unique HARQ feedback Resource Index, the indicated resource set of PUCCH resource or PUCCH resource instance, and the configured numbering of the whole feedback resource within one uplink feedback resource period to decide the actual PUCCH resource or PUCCH resource instance for its uplink feedback resource for a particular multicast PDSCH transmission.
  • FIG. 8 illustrates exemplary diagrams of UE identifying UE PUCCH feedback resources with mappings between HARQ feedback resource index and PUCCH resource/resource instance for NR multicast services in accordance with embodiments of the current invention.
  • a UE-A 801 and a UE-D 802 receives two multicast services, service #1 and service #2.
  • a PUCCH resource 810 is configured for multicast feedback resources.
  • a PUCCH resource index in slot n as shown in 811 has sixteen PUCCH resources.
  • 812 shows number of cyclic shift for each PUCCH resource in 811.
  • Two multicast services service#1 and service# has corresponding MTCH-A and MTCH-B.
  • PUCCH resource set 821 with PUCCH resource instance index #0 to #16 are allocated for MTCH-A/service#1.
  • PUCCH resource set 822 with PUCCH resource instance index #17 to #27 are allocated for MTCH-B/service#2.
  • the seventeen UEs joins the multicast service carried by MTCH-A.
  • HARQ feedback resource index tabble 831 for MTCH-A correspondingly 17 PUCCH resources or PUCCH resource instances are allocated for uplink feedback of this multicast transmision for ACK/NACK option based HARQ feedback.
  • UE-A 801 is allocated with HARQ feedback Resource Index #0 within MTCH-A.
  • UE-A 801 is allocated with HARQ feedback Resource Index #0 within MTCH-A.
  • UE-A 801 uses the first PUCCH Resource or PUCCH Resource instance among the resource set for ACK/NACK option based HARQ feedback.
  • UE-A 801 joins the multicast service carried by MTCH-B.
  • UE-A 801 is allocated with HARQ feedback Resource Index #0 within MTCH-B, as shown in HARQ feedback resource index tabble 832 for MTCH-B.
  • UE-A 801 uses the first PUCCH Resource or PUCCH resource instance among the resource set for ACK/NACK option based HARQ feedback, which is #17 in PUCCH resource index 813.
  • UE-A 801 joins the multicast service carried by MTCH-B.
  • UE-A 801 is allocated with HARQ feedback Resource Index #0 within MTCH-B, as shown in HARQ feedback resource index tabble 832 for MTCH-B.
  • UE-A 801 uses the first PUCCH Resource or PUCCH resource instance among the resource set for ACK/NACK option based HARQ feedback, which is #17 in PUCCH resource index 813.
  • UE-D 802 is allocated with HARQ feedback Resource Index #3 within MTCH-A.
  • UE-D 802 based on index table 831, uses the PUCCH resource or PUCCH resource instance #3 among the resource set for ACK/NACK option based HARQ feedback.
  • UE-D 802 joins the multicast service carried by MTCH-B.
  • UE-D 802 is allocated with HARQ feedback Resource Index #3 within MTCH-B, as shown in HARQ feedback resource index tabble 832 for MTCH-B.
  • UE-D 802 uses the fourth PUCCH Resource or PUCCH resource instance among the resource set for ACK/NACK option based HARQ feedback, which is #20 in PUCCH resource index 813.
  • ACK based HARQ feedback and NACK based HARQ feedback can be differentiated using different cyclic shift of the same base sequence in the PUCCH resource. This will make the size of the resource set smaller, as one second option based HARQ feedback actually occupies a pair of PUCCH Resource or PUCCH Resource instance. This also means PUCCH Resource with more than two cyclic shifts assoicated can be only applicable to one UE.
  • implicit mechanism is used to determine the PUCCH resource within a set of PUCCH resource or PUCCH resource instance.
  • UE specific ID configured by BS (e.g.
  • both UE C-RNTI plus one identity among G-RNTI, multicast Session ID, multicast Group ID and the index of MTCH (i.e. MTCHindex) in the MTCH info list, or its truncated version is used determine the PUCCH resource.
  • the intention is to enable different UE within a multicast Group to utilize different PUCCH resource or PUCCH Resource instance to tranmist uplink HARQ feedback.
  • Hash based algorthim can be used to acquire one of the PUCCH resource or PUCCH Resource instance by the value of C-RNTI mod N.
  • Figure 9 illustrates an exemplary flow chart for resource assignment for HARQ feedback to support multicast transmission in accordance with embodiments of the current invention.
  • the UE receives an uplink feedback resource configuration with physical uplink control channel (PUCCH) feedback resources configured for one or more physical downlink shared channel (PDSCH) multicast transmissions from a new radio (NR) network, wherein the uplink feedback resource configuration assigns a unique resource index to each configured PUCCH feedback resource and includes an uplink feedback type indicator.
  • PUCCH physical uplink control channel
  • PDSCH physical downlink shared channel
  • NR new radio
  • the uplink feedback resource configuration assigns a unique resource index to each configured PUCCH feedback resource and includes an uplink feedback type indicator.
  • the UE receives one or more PDSCH multicast transmissions in the NR network.
  • the UE identifies one or more UE feedback resources allocated for the UE based on the uplink feedback resource configuration.
  • the UE sends uplink feedbacks for the received one or more multicast transmissions using the identified

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Abstract

Appareil et procédés d'attribution de ressources pour prendre en charge une rétroaction HARQ de liaison montante d'UE pour les transmissions de multidiffusion NR. Dans un nouvel aspect, le gNB attribue un indice unique à chacune de la ressource de PUCCH ou des instances de ressource de PUCCH pour la rétroaction de la transmission de PDSCH de multidiffusion. La numérotation de l'indice pour toutes les ressources de rétroaction est configurée. La ressource de rétroaction de liaison montante est configurée avec un ou plusieurs éléments comprenant une sous-trame ou un index de créneau, un indice de départ de ressources de PUCCH ou des instances de ressources PUCCH, et le nombre de ressources de PUCCH ou d'instances de ressources de PUCCH. Le gNB indique explicitement l'ensemble des ressources de PUCCH ou des instances de ressources de PUCCH par l'intermédiaire d'un message RRC ou de DCI de multidiffusion. Le gNB indique un indice de ressource de rétroaction HARQ unique à chaque UE joignant la réception de chaque service de multidiffusion pour un support radio de multidiffusion particulier.
PCT/CN2021/076498 2020-02-17 2021-02-10 Procédés et appareil d'attribution de ressources pour rétroaction harq pour prendre en charge une transmission de multidiffusion WO2021164682A1 (fr)

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