WO2023245566A1 - Procédés et appareil pour prendre en charge une rétroaction harq par accès aléatoire pour une réception de multidiffusion en rrc inactive - Google Patents

Procédés et appareil pour prendre en charge une rétroaction harq par accès aléatoire pour une réception de multidiffusion en rrc inactive Download PDF

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Publication number
WO2023245566A1
WO2023245566A1 PCT/CN2022/100868 CN2022100868W WO2023245566A1 WO 2023245566 A1 WO2023245566 A1 WO 2023245566A1 CN 2022100868 W CN2022100868 W CN 2022100868W WO 2023245566 A1 WO2023245566 A1 WO 2023245566A1
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WO
WIPO (PCT)
Prior art keywords
random access
multicast
harq feedback
harq
feedback
Prior art date
Application number
PCT/CN2022/100868
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English (en)
Inventor
Xiaonan Zhang
Yuanyuan Zhang
Xuelong Wang
Original Assignee
Mediatek Singapore Pte. Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Mediatek Singapore Pte. Ltd. filed Critical Mediatek Singapore Pte. Ltd.
Priority to PCT/CN2022/100868 priority Critical patent/WO2023245566A1/fr
Publication of WO2023245566A1 publication Critical patent/WO2023245566A1/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
    • H04L1/12—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
    • H04L1/1887—Scheduling and prioritising arrangements
    • 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
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • the present disclosure relates generally to communication systems, and more particularly, the method to send HARQ feedback by random access procedure for MBS multicast in RRC INACTIVE state.
  • Various cellular systems may provide a multicast functionality, which allows user equipments (UEs) in the system to receive multicast services transported by the cellular system.
  • UEs user equipments
  • a variety of applications may rely on communication over multicast transmission, such as live stream, video distribution, vehicle-to-everything (V2X) communication, public safety (PS) communication, file download, and so on.
  • V2X vehicle-to-everything
  • PS public safety
  • file download and so on.
  • legacy system the multicast service is received by UE which in RRC CONNECTED state.
  • RRC CONNECTED state For high load/congestion scenario, it may be possible for UE to receive multicast service in RRC CONNECTED state. It can also improve the multicast service in terms of power saving, service coverage and spectrum efficiency.
  • the HARQ feedback for multicast is configured in ACK-NACK feedback or NACK-only feedback, and UE sends the HARQ feedback in RRC CONNECTED mode.
  • some procedure to send HARQ feedback may be introduced to better support UE to receive multicast in RRC INACTIVE, and UE may not need to transmit to RRC CONNECTED to send HARQ feedback for multicast.
  • apparatus and mechanisms are sought to send HARQ feedback by random access (RA) procedure for MBS multicast in RRC INACTIVE state.
  • RA random access
  • a method, a computer-readable medium, and an apparatus are provided.
  • the apparatus may be a UE.
  • UE may fail to decode the multicast TB (transport block) received via G-RNTI.
  • UE sends HARQ feedback by multicast specific random access procedure.
  • the network retransmits the TB for multicast when the random access for HARQ feedback is received.
  • the NACK-only feedback is used for multicast HARQ feedback in RRC INACTIVE.
  • the CBRA (Contention Based Random Access) procedure is performed for multicast HARQ feedback in RRC INACTIVE.
  • the 4-step based random access procedure is performed for multicast HARQ feedback in RRC INACTIVE.
  • the 2-step based random access procedure is performed for multicast HARQ feedback in RRC INACTIVE.
  • the UE requests for RRC Resume before starting the RA procedure for HARQ feedback.
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents.
  • Figure 1 illustrates a schematic system diagram illustrating an exemplary wireless network in accordance with embodiments of the current invention.
  • Figure 2 illustrates an exemplary NR wireless system with centralization of the upper layers of the NR radio stacks in accordance with embodiments of the current invention.
  • Figure 3 illustrate an exemplary flowchart of procedures for UE to receive multicast service in RRC INACTIVE state and send HARQ feedback via random access procedure to network in accordance with embodiments of the current invention.
  • Figure 4 illustrate an exemplary flowchart of procedures for UE to perform HARQ procedure according to the retransmitted TB for multicast reception in RRC INACTIVE state.
  • Figure 5 illustrate an exemplary overall flow for UE to report HARQ feedback by 4-step contention based random access procedure for multicast reception in RRC INACTIVE state in accordance with embodiments of the current invention.
  • Figure 6 illustrate an exemplary overall flow for UE to report HARQ feedback by 2-step based CBRA procedure for multicast reception in RRC INACTIVE state in accordance with embodiments of the current invention.
  • NR new radio access technology, or 5G technology
  • NR may support various wireless communication services. These services may have different quality of service (QoS) requirements e.g., latency and reliability requirements.
  • QoS quality of service
  • FIG. 1 illustrates a schematic system diagram illustrating an exemplary wireless network in accordance with embodiments of the current invention.
  • 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, a gNB, or by other terminology used in the art.
  • base stations serve a number of mobile stations within a serving area, for example, a cell, or within a cell sector.
  • one or more base stations are coupled to a controller forming an access network that is coupled to one or more core networks.
  • gNB 1and gNB 2 are base stations in NR, the serving area of which may or may not overlap with each other.
  • UE1 or mobile station is only in the service area of gNB 1 and connected with gNB1.
  • UE1 is connected with gNB1 only, gNB1 is connected with gNB2 via Xn interface.
  • UE2 is in the overlapping service area of gNB1 and gNB2.
  • both gNB1 and gNB2 provide the same MBS services, service continuity during handover is guaranteed when UE 2 moves from gNB1 to gNB2 and vice versa.
  • Figure 1 further illustrates simplified block diagrams for UE2 and gNB2, respectively.
  • UE has an antenna, which transmits and receives radio signals.
  • a RF transceiver coupled with the antenna, receives RF signals from antenna, converts them to baseband signal, and sends them to processor.
  • the RF transceiver may comprise two RF modules (not shown) .
  • a first RF module is used for transmitting and receiving on one frequency band, and the other RF module is used for different frequency bands transmitting and receiving which is different from the first transmitting and receiving.
  • RF transceiver also converts received baseband signals from processor, converts them to RF signals, and sends out to antenna.
  • Processor processes the received baseband signals and invokes different functional modules to perform features in UE.
  • Memory stores program instructions and data to control the operations of mobile station.
  • UE also includes multiple function modules that carry out different tasks in accordance with embodiments of the current invention.
  • a RRC State controller which controls UE RRC state according to network’s command and UE conditions.
  • RRC supports the following states, RRC_IDLE, RRC_CONNECTED and RRC_INACTIVE.
  • UE receives the multicast services in RRC INACTIVE state.
  • the UE applies the MRB establishment procedure to start receiving a session of a service it has joined in.
  • the UE applies the MRB release procedure to stop receiving a session.
  • UE sends HARQ feedback for multicast reception in RRC INACTIVE state.
  • a MRB controller which controls to establish/add, reconfigure/modify and release/remove a MRB based on different sets of conditions for MRB establishment, reconfiguration and release.
  • a protocol stack controller which manage to add, modify or remove the protocol stack for the MRB.
  • the protocol Stack includes RLC, MAC and PHY layers.
  • the SDAP layer is optionally configured.
  • the PDCP layer supports the functions of transfer of data, maintenance of PDCP SN, header compression and decompression using the ROHC protocol, ciphering and deciphering, integrity protection and integrity verification, timer based SDU discard, routing for split bearer, duplication, re-ordering and in-order delivery; out of order delivery and duplication discarding.
  • the receiving PDCP entity sends PDCP status report upon t-Reordering expiry.
  • the PDCP status reports triggers PDCP retransmission at the peer transmitting PDCP entity at the network side.
  • the RLC layer supports the functions of error correction through ARQ, segmentation and reassembly, re-segmentation, duplication detection, re-establishment, etc.
  • a new procedure for RLC reconfiguration is performed, which can reconfigure the RLC entity to associated to one or two logical channels.
  • the MAC layer supports the following functions: mapping between logical channels and transport channels, multiplexing/demultiplexing, HARQ, radio resource selection, etc.
  • gNB2 has an antenna, which transmits and receives radio signals.
  • a RF transceiver coupled with the antenna, receives RF signals from antenna, converts them to baseband signals, and sends them to processor.
  • RF transceiver also converts received baseband signals from processor, converts them to RF signals, and sends out to antenna.
  • Processor processes the received baseband signals and invokes different functional modules to perform features in gNB2.
  • Memory stores program instructions and data to control the operations of gNB2.
  • gNB2 also includes multiple function modules that carry out different tasks in accordance with embodiments of the current invention.
  • RRC State controller which performs access control for the UE.
  • RRC supports the following states, RRC_IDLE, RRC_CONNECTED and RRC_INACTIVE.
  • UE receives the multicast services in RRC INACTIVE state.
  • the HARQ is supported for multicast reception in RRC INACTIVE state.
  • a MRB controller which controls to establish/add, reconfigure/modify and release/remove a MRB based on different sets of conditions for MRB establishment, reconfiguration and release.
  • a protocol stack controller which manage to add, modify or remove the protocol stack for the MRB.
  • the protocol Stack includes SDAP, PDCP, RLC, MAC and PHY layers.
  • Figure 2 illustrates an exemplary NR wireless system with centralization of the upper layers of the NR radio stacks in accordance with embodiments of the current invention.
  • Different protocol split options between Central Unit and lower layers of gNB nodes may be possible.
  • the functional split between the Central Unit and lower layers of gNB nodes may depend on the transport layer.
  • Low performance transport between the Central Unit and lower layers of gNB nodes can enable the higher protocol layers of the NR radio stacks to be supported in the Central Unit, 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 central unit, while RLC, MAC and PHY layers are located in the distributed unit.
  • Figure 3 illustrate an exemplary flowchart of procedures for UE to receive multicast service in RRC INACTIVE state and send HARQ feedback via random access procedure to network in accordance with embodiments of the current invention.
  • UE sends HARQ feedback in RRC INACTIVE state via random access procedure.
  • the NACK only HARQ feedback is configured for multicast transmission in RRC INACTIVE, and it shares a common resource for all UEs.
  • the UE receiving multicast in RRC INACTIVE state reports HARQ feedback independently.
  • the network performs HARQ retransmission if one NACK feedback is received.
  • the network performs HARQ retransmission by multiple NACK feedbacks from UEs.
  • Figure 4 illustrate an exemplary flowchart of procedures for UE to perform HARQ procedure according to the retransmitted TB for multicast reception in RRC INACTIVE state.
  • the network retransmits the TB for multicast by the NACK feedback from UE.
  • the UE performs the HARQ procedure for the retransmitted TB for multicast.
  • the TB is not received by UE before, and UE decodes the received data.
  • the TB received is not successfully decoded by UE, and UE combines the received data with the data currently in the soft buffer for this TB and attempt to decode the combined data.
  • the TB received is successfully received by UE, and UE does not instruct the physical layer to generate acknowledgement (s) of the data and discard the TB.
  • Figure 5 illustrate an exemplary overall flow for UE to report HARQ feedback by 4-step contention based random access procedure for multicast reception in RRC INACTIVE state in accordance with embodiments of the current invention.
  • the HARQ feedback is performed by contention based random access procedure and UE reports HARQ feedback with contention. If the TB for multicast received via G-RNTI is not successfully decoded by UE, UE may initiate the random access procedure to send HARQ feedback to the network. In one embodiment, the UE sends RRCResumeRequest/RRCResumeRequest1 to the network before the random access procedure.
  • UE chooses a preamble to transmit MSG1 to the network. After MSG1 transmission, the UE monitors for a response from the network within a configured window. The network may send MSG2 with Random Access Response.
  • the PUSCH resource delivered in MSG2 for the multicast HARQ feedback is a common resource for all UEs.
  • the UE Upon the reception of MSG2 with RAR from network, the UE will send MSG3 using the UL grant scheduled in the response and monitors contention resolution.
  • the UCI for the multicast NACK feedback is delivered in MSG3.
  • the G-RNTI for the multicast service is delivered in MSG3.
  • the gNB acknowledges the HARQ feedback in MSG4.
  • network then performs multicast HARQ retransmission according to the NACK feedback (s) from one or multiple UE (s) .
  • Figure 6 illustrate an exemplary overall flow for UE to report HARQ feedback by 2-step based CBRA procedure for multicast reception in RRC INACTIVE state in accordance with embodiments of the current invention.
  • UE may initiate the 2-step based random access procedure to send HARQ feedback to the network.
  • the UE sends RRCResumeRequest/RRCResumeRequest1 to the network before the random access procedure.
  • UE sends preamble with UE specific identifier as MSGA to the network.
  • the PUSCH resource for multicast HARQ feedback is pre-allocated by the network.
  • the UCI for the multicast NACK feedback is delivered in MSGA.
  • the G-RNTI for the multicast service is delivered in MSGA.
  • the UE monitors for a response from the network within a configured window. After contention resolution, the gNB acknowledges the HARQ feedback in MSGB.
  • network then performs multicast HARQ retransmission according to the NACK feedback (s) from one or multiple UE (s) .
  • Combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” include any combination of A, B, and/or C, and may include multiples of A, multiples of B, or multiples of C.
  • combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combinations may contain one or more member or members of A, B, or C.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente divulgation concerne des procédés et un appareil pour prendre en charge une rétroaction HARQ pour une réception de multidiffusion en RRC inactive. Une procédure particulière est introduite pour utiliser un message d'accès aléatoire (RA) pour rapporter une rétroaction HARQ au réseau, et un réseau peut répondre à la rétroaction HARQ par un message RA et effectuer une retransmission HARQ pour l'UE. L'accès aléatoire pour une rétroaction HARQ de multidiffusion peut être basé sur la contention, avec une procédure RA en 4 étapes ou en 2 étapes. Dans un mode de réalisation, l'UE demande une reprise de RRC avant de démarrer la procédure RA pour une rétroaction HARQ. Dans un mode de réalisation, le réseau effectue une retransmission HARQ sur la base d'une ou de multiples rétroactions NACK provenant d'un ou de plusieurs UE.
PCT/CN2022/100868 2022-06-23 2022-06-23 Procédés et appareil pour prendre en charge une rétroaction harq par accès aléatoire pour une réception de multidiffusion en rrc inactive WO2023245566A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109845382A (zh) * 2016-11-04 2019-06-04 Lg电子株式会社 用于发送上行链路信号的方法和用户设备
CN112715013A (zh) * 2019-08-26 2021-04-27 Oppo广东移动通信有限公司 用户设备及其混合自动重传请求选项配置方法
WO2021139747A1 (fr) * 2020-01-10 2021-07-15 FG Innovation Company Limited Procédé et équipement d'utilisateur permettant la réception de données de service de diffusion/multidiffusion
US20220029768A1 (en) * 2020-07-24 2022-01-27 Huawei Technologies Co., Ltd. System and method for harq feedback in rrc inactive state
WO2022080362A2 (fr) * 2020-10-12 2022-04-21 Toyota Jidosha Kabushiki Kaisha Amélioration de rétroaction pour des services de diffusion/multidiffusion

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109845382A (zh) * 2016-11-04 2019-06-04 Lg电子株式会社 用于发送上行链路信号的方法和用户设备
CN112715013A (zh) * 2019-08-26 2021-04-27 Oppo广东移动通信有限公司 用户设备及其混合自动重传请求选项配置方法
WO2021139747A1 (fr) * 2020-01-10 2021-07-15 FG Innovation Company Limited Procédé et équipement d'utilisateur permettant la réception de données de service de diffusion/multidiffusion
US20220029768A1 (en) * 2020-07-24 2022-01-27 Huawei Technologies Co., Ltd. System and method for harq feedback in rrc inactive state
WO2022080362A2 (fr) * 2020-10-12 2022-04-21 Toyota Jidosha Kabushiki Kaisha Amélioration de rétroaction pour des services de diffusion/multidiffusion

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
VIVO: "Remaining issues on basic functions for broadcast/multicast for RRC_IDLE/RRC_INACTIVE UEs", 3GPP DRAFT; R1-2109003, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20211011 - 20211019, 1 October 2021 (2021-10-01), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052057964 *

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