WO2022027588A1 - Améliorations d'attribution de ressources sl - Google Patents

Améliorations d'attribution de ressources sl Download PDF

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Publication number
WO2022027588A1
WO2022027588A1 PCT/CN2020/107805 CN2020107805W WO2022027588A1 WO 2022027588 A1 WO2022027588 A1 WO 2022027588A1 CN 2020107805 W CN2020107805 W CN 2020107805W WO 2022027588 A1 WO2022027588 A1 WO 2022027588A1
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WO
WIPO (PCT)
Prior art keywords
information
resource
assistance information
feedback
reserved
Prior art date
Application number
PCT/CN2020/107805
Other languages
English (en)
Inventor
Tao Chen
Lung-Sheng Tsai
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.)
Filing date
Publication date
Application filed by Mediatek Singapore Pte. Ltd. filed Critical Mediatek Singapore Pte. Ltd.
Priority to PCT/CN2020/107805 priority Critical patent/WO2022027588A1/fr
Priority to CN202110821034.7A priority patent/CN114071587A/zh
Priority to TW110128014A priority patent/TWI828999B/zh
Priority to US17/394,908 priority patent/US11877144B2/en
Publication of WO2022027588A1 publication Critical patent/WO2022027588A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/26—Resource reservation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance

Definitions

  • This disclosure relates generally to wireless communications, and, more particularly, to methods and apparatus about SL resource allocation enhancement.
  • V2X sidelink (SL) communication can be supported by the unicast, groupcast and broadcast communications.
  • SL resource allocation there are some issues to be addressed for SL resource allocation to improve the reliability and reduce the latency of SL communications.
  • This disclosure relates generally to wireless communications, and, more particularly, to methods and apparatus about SL resource allocation enhancement.
  • the Rx UE assisted resource allocation mechanism can be applied to improve the reliability and reduce the overall latency for SL communication, which can work independently or jointly with Tx UE based sensing and resource allocation mechanism.
  • Rx UE can be triggered to send the feedback information upon reception of the SCI and/or data from the Tx UE.
  • the feedback information can carry Rx UE’s resource sensing information, CSI info, observed Doppler/delay/moving speed related information, which could be related to absolute speed or relative speed between Tx UE and Rx UE, and MIMO related feedback information to assist the resource/MCS/MIMO/DMRS pattern selection at Tx UE.
  • Rx UE It is desirable for Rx UE to feedback such assistance information (just) before the reserved resources by Tx UE to be transmitted. So the Tx UE can take into account the feedback information to assist resource re-selection and/or resource utilization.
  • Rx-UE can get the reserved Tx resource information from SCI of Tx UE and determine the feedback timing based on the instant for transmission of the reserved Tx resources by considering the additional time for Tx UE to process the assistance information. Meanwhile, the Rx-UE should feedback the latest assistance information, i.e., updated feedback information based on the transmission timing of the assistance information.
  • Fig. 1 shows the procedure for Rx UE to transmit the assistance information.
  • FIG. 2 shows an exemplary block diagram of a UE (a.k.a device) according to an embodiment of the disclosure.
  • the Rx UE assisted resource allocation mechanism can be applied to improve the reliability and reduce the overall latency for SL communication, which can work independently or jointly with Tx UE based sensing and resource allocation mechanism.
  • Rx UE can send the assistance information autonomously to the Tx UEs or broadcast it to the potential Tx UEs. Alternatively, Rx UE can be triggered to send the assistance information upon reception of the transmission from the Tx UE (e.g., SCI and/or data from the Tx UE) .
  • the assistance information for feedback can carry (un-) preferred time/frequency resources based on sensing at Rx UE. Sensing at Rx UE is similar to the sensing at Tx UE, i.e., Rx UE will perform sensing on the resource pools for reception (or the Tx pool of the peer Tx UE) by measuring RSRP according to the detected SCI from the other UEs.
  • Tx UE may need to inform Rx UE the resource pool for sensing (or the pool for transmission by Tx UE) via signaling so that the Rx UE can provide the sensing results to assist the Tx UE’s resource (re-) selection.
  • resource pool (s) can be (pre-) configured.
  • the Rx UE Based on the measured RSRP, the priority of the peer Tx UE’s transmission, the priority of the sensed UEs, and/or the corresponding resources reserved by SCI from the peer Tx UE, the Rx UE can determine whether the resources reserved by the peer Tx UE is preferred or not from the Rx UE perspective, which may avoid the hidden node problem.
  • the priority of the peer Tx UE’s transmission can be determined according to the priority indicated in SCI or a (pre-) configured priority for the MAC flow or the link pair.
  • the priority of the sensed UE can be obtained from the detected SCI by the Rx UE when perform sensing.
  • the RSRP threshold can be set according to the combination of the priority of the peer Tx UE’s transmission and the priority of the sensed UE’ transmission.
  • Rx UE will compare the measured RSRP of the sensed Tx UE’s control and/or data DMRS transmission with the RSRP threshold to determine whether the preferred resources are preferred or not. For example, if the measured RSRP is lower than the threshold, the reserved resources may be determined as acceptable or preferred. Otherwise, the reserved resources may be determined as unacceptable or un-preferred.
  • the Rx UE can also feedback CSI information.
  • CSI information can be corresponding to the preferred/acceptable (reserved) resources which can be used for MCS selection once the resource is used by Tx UE.
  • the observed Doppler/delay/moving speed related information or preferred DMRS pattern from Rx UE perspective can be carried in the assistance information so that Tx UE can select the suitable DMRS pattern (the number of DMRS symbols in a slot) for tranamission.
  • Rx UE It is desirable for Rx UE to feedback such assistance information (just) before the reserved resources by Tx UE to be transmitted. So the Tx UE can take into account the feedback information to assist resource re-selection and/or resource utilization.
  • Rx-UE can get the reserved Tx resource information from SCI of Tx UE and determine the feedback timing based on the instant for transmission of the reserved Tx resources by considering the additional time for Tx UE to process the assistance information. Meanwhile, the Rx-UE should feedback the latest assistance information, i.e., updated feedback information based on the transmission timing of the assistance information.
  • the Rx UE can perform partial sensing (e.g., periodic sensing or one-shot sensing) or full sensing to determine the reserved resource acceptable/preferred or not. Then Rx UE can send such assistance information before the transmission of the reserved resources by the peer Tx UE or before the (re-) selection or re-evaluation time of the reserved resources.
  • the resources closest to the time instant for re-evaluation of the reserved resources indicated in SCI by Tx UE (Note: the additional time for processing of the assistance information may be considered) will be prioritized for selection so that the latest assistance information can be sent to the Tx UE for the efficient resource (re-) selection or re-evaluation.
  • the latest time for transmission of the assistance information can be the time of the reserved resources minus the sum of the processing time for re-evaluation/re-selection at Tx UE and the processing time for assistance information reception and parsing.
  • the Rx UE will take the transmission time for the reserved resources indicated in SCI as the packet delay budget to (re-) select the resources for transmission of the assistance information.
  • the latest time for transmission of the assistance information i.e., packet delay budget for the assistance information
  • the latest time (or the delay budget) for assistance information transmission is equal to the time instant for the reserved resources minus the time duration.
  • time duration may consider the processing time at Tx UE. If such processing time is UE specific, it can be indicated in the SCI by the peer Tx UE. If such processing time is common, it can be (pre-) configured and exchanged between UEs via signaling (e.g., PC5-RRC signaling) or specified in the specification.
  • Priority for the transmission of the assistance information indicated in the SCI can be set to the (pre-) configured priority or the priority corresponding to the peer Tx UE’s SCI triggering the transmission of the assistance information.
  • the assistance information corresponding to each reserved resource can be sent before the transmission of each reserved resources.
  • the assistance information should carry the latest information for feedback.
  • the contents of the assistance information should be updated according to the latest information before the time instant of the re-selected resources for the assistance information transmission.
  • the processing time at Rx UE to update the assistance information before the transmission can be taken into account for preparation. So the assistance information should be updated based on the latest information before or at the time instant which is derived from the time (re-) selected for assistance information transmission and the processing time at Rx UE. For example, the time instant can be equal to the time (re-) selected for assistance information transmission minus the processing time at Rx UE.
  • the assistance information can be carried in the standalone SCI with or without PSSCH.
  • the assistance information can also be carried in PSSCH, especially when there is the traffic for transmission in PSSCH.
  • the 2 nd SCI can carry such assistance information with the field to indicate whether the assistance information is carried in the 2 nd SCI and/or whether the assistance information is carried in the 2 nd SCI with or without the data channel (i.e., PSSCH) .
  • the resources for transmission of the assistance information can be implicitly and/or explicitly derived from the received SCI of the peer Tx UE.
  • the resources can be determined based on a function of Tx UE ID and/or Rx UE ID within a (pre-) configured resource set (a set of time/frequency resources) region. Due to the unique link pair or Tx/Rx UE ID, the frequency resources for transmission of the assistance information can be unique or differentiated with the other pairs.
  • the time of the resource can be a function of the time for the reserved resource indicated in SCI.
  • it can be a time offset to the time for the reserved resource or the re-evaluation time of the reserved resources (e.g., derived/indicated in the SCI as above mentioned) taking into account the processing time at Tx UE.
  • the time offset can be fixed or indicated in SCI or (pre-) configured.
  • Such time offset can be (pre-) configured per resource pool. So that Rx UE can determine the time/frequency resources in a (pre-) configured resource set based on the received SCI information from the Tx UE for transmission of the assistance information carried in 2 nd SCI, PSSCH or any (feedback) channel.
  • Such explicit signaling or implicit rule for resource determination can avoid sensing and resource selection procedure for transmission of the assistance information.
  • Fig. 1 shows the procedure for Rx UE to transmit the assistance information.
  • the Rx UE upon reception of SCI at m’ from the peer Tx UE, the Rx UE will trigger the resource selection in the selection window for the transmission of the assistance information based on the partial sensing or full sensing in the past, i.e., the sensing window.
  • the Rx UE performs sensing at the Tx pool of the peer Tx UE for assistance information generation as well as its own Tx pool for assistance information transmission.
  • the Tx pool of the peer Tx UE can be (pre-) configured for the Rx UE or via PC-5 RRC signaling exchange. This may further impose the restriction on Tx pool for transmission at Tx UE.
  • the SCI received at m’ will indicate the reserved resource at m” (and the processing time T_proc) .
  • the Rx UE will try to select the resource for assistance information transmission close to the time instant (m’-T_proc) whci may be before or at the re-evaluation time for the reserved resource at m”.
  • Tx UE will perform re-evaluation for the reserved resource at m” based on its own sensing results and the assistance information from the Rx UE.
  • the assistance information may indicate whether the reserved resource at m” is acceptable or not.
  • the assistance information may further indicate CSI information for the reserved resource if acceptable and/or CSI information for the other preferred resources from Rx UE perspective according to the sensing and measurement in the Rx UE.
  • the assistance information may further indicate the preferred DMRS pattern or the Doppler related information for Tx UE to select the suitable DMRS pattern.
  • FIG. 2 shows an exemplary block diagram of a UE (a.k.a device) according to an embodiment of the disclosure.
  • a processor 810 can be configured to perform various functions of embodiments of the invention.
  • the processor 810 can include signal processing circuitry to process received or to be transmitted data according to communication protocols specified in, for example, LTE and NR standards. Additionally, the processor 810 may execute program instructions, for example, stored in the memory 820, to perform functions related with different communication protocols.
  • the processor 810 can be implemented with suitable hardware, software, or a combination thereof.
  • the processor 810 can be implemented with application specific integrated circuits (ASIC) , field programmable gate arrays (FPGA) , and the like, that includes circuitry.
  • the circuitry can be configured to perform various functions of the processor 810.
  • the memory 820 can store program instructions that, when executed by the processor 810, cause the processor 810 to perform various functions as described herein.
  • the memory 820 can include a read only memory (ROM) , a random access memory (RAM) , a flash memory, a solid state memory, a hard disk drive, and the like.
  • the RF module 830 can be configured to receive a digital signal from the processor 810 and accordingly transmit a signal to a base station in a wireless communication network via an antenna 840.
  • the RF module 830 can be configured to receive a wireless signal from a base station and accordingly generate a digital signal which is provided to the processor 810.
  • the RF module 830 can include digital to analog/analog to digital converters (DAC/ADC) , frequency down/up converters, filters, and amplifiers for reception and transmission operations.
  • DAC/ADC digital to analog/analog to digital converters
  • the RF module 830 can include converter circuits, filter circuits, amplification circuits, and the like, for processing signals on different carriers or bandwidth parts.
  • the UE 800 can optionally include other components, such as input and output devices, additional CPU or signal processing circuitry, and the like. Accordingly, the UE 800 may be capable of performing other additional functions, such as executing application programs, and processing alternative communication protocols.
  • the processes and functions described herein can be implemented as a computer program which, when executed by one or more processors, can cause the one or more processors to perform the respective processes and functions.
  • the computer program may be stored or distributed on a suitable medium, such as an optical storage medium or a solid-state medium supplied together with, or as part of, other hardware.
  • the computer program may also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems.
  • the computer program can be obtained and loaded into an apparatus, including obtaining the computer program through physical medium or distributed system, including, for example, from a server connected to the Internet.
  • the computer program may be accessible from a computer-readable medium providing program instructions for use by or in connection with a computer or any instruction execution system.
  • a computer readable medium may include any apparatus that stores, communicates, propagates, or transports the computer program for use by or in connection with an instruction execution system, apparatus, or device.
  • the computer-readable medium can be magnetic, optical, electronic, electromagnetic, infrared, or semiconductor system (or apparatus or device) or a propagation medium.
  • the computer-readable medium may include a computer-readable non-transitory storage medium such as a semiconductor or solid state memory, magnetic tape, a removable computer diskette, a random access memory (RAM) , a read-only memory (ROM) , a magnetic disk and an optical disk, and the like.
  • the computer-readable non-transitory storage medium can include all types of computer readable medium, including magnetic storage medium, optical storage medium, flash medium and solid state storage medium.

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

Abstract

Pour l'attribution de ressources SL, le mécanisme d'attribution de ressources assisté par l'UE Rx peut être appliqué afin d'améliorer la fiabilité et de réduire la latence globale pour la communication SL, ce qui permet de fonctionner indépendamment ou conjointement avec un mécanisme de détection et d'attribution de ressources basé sur l'UE Tx. L'UE Rx peut être déclenché pour envoyer les informations de rétroaction lors de la réception des SCI et/ou des données provenant de l'UE Tx. Les informations de rétroaction peuvent transporter des informations de détection de ressources de l'UE Rx, des informations CSI, des informations relatives à la vitesse Doppler/de retard/de déplacement observées, ainsi que des informations de rétroaction associées au MIMO pour aider à la sélection du motif de ressource/MCS/MIMO/DMRS sur l'UE Tx. Il est souhaitable que l'UE Rx reçoive ces informations d'aide (juste) avant que les ressources réservées par l'UE Tx ne soient transmises. Ainsi, l'UE Tx peut prendre en compte les informations de rétroaction pour aider à la resélection de ressources et/ou à l'utilisation des ressources. L'UE Rx peut obtenir les informations de ressources Tx réservées à partir des SCI de l'UE Tx et déterminer la synchronisation de rétroaction d'après l'instant de transmission des ressources Tx réservées en tenant compte du temps supplémentaire requis par l'UE Tx pour traiter les informations d'aide. Pendant ce temps, l'UE Rx renvoie les dernières informations d'aide, c'est-à-dire des informations de rétroaction mises à jour d'après la synchronisation de transmission des informations d'aide.
PCT/CN2020/107805 2020-08-07 2020-08-07 Améliorations d'attribution de ressources sl WO2022027588A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PCT/CN2020/107805 WO2022027588A1 (fr) 2020-08-07 2020-08-07 Améliorations d'attribution de ressources sl
CN202110821034.7A CN114071587A (zh) 2020-08-07 2021-07-20 侧行链路资源分配的增强机制
TW110128014A TWI828999B (zh) 2020-08-07 2021-07-30 側行鏈路資源配置的增強機制
US17/394,908 US11877144B2 (en) 2020-08-07 2021-08-05 Sidelink resource allocation enhancements

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2020/107805 WO2022027588A1 (fr) 2020-08-07 2020-08-07 Améliorations d'attribution de ressources sl

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Citations (3)

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Publication number Priority date Publication date Assignee Title
CN110662202A (zh) * 2018-06-29 2020-01-07 华硕电脑股份有限公司 在无线通信系统中处理装置到装置资源释放的方法和设备
US20200106566A1 (en) * 2018-09-28 2020-04-02 Samsung Electronics Co., Ltd. Method and device for transmitting or receiving groupcast feedback in wireless cellular communication system
US20200229171A1 (en) * 2019-04-02 2020-07-16 Intel Corporation Methods of autonomous resource selection in new radio (nr) vehicle-to-everything (v2x) sidelink communication

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
CN110662202A (zh) * 2018-06-29 2020-01-07 华硕电脑股份有限公司 在无线通信系统中处理装置到装置资源释放的方法和设备
US20200106566A1 (en) * 2018-09-28 2020-04-02 Samsung Electronics Co., Ltd. Method and device for transmitting or receiving groupcast feedback in wireless cellular communication system
US20200229171A1 (en) * 2019-04-02 2020-07-16 Intel Corporation Methods of autonomous resource selection in new radio (nr) vehicle-to-everything (v2x) sidelink communication

Non-Patent Citations (1)

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Title
OPPO: "Remaining issues of physical layer procedure for NR-V2X", 3GPP DRAFT; R1-2000492, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20200224 - 20200306, 14 February 2020 (2020-02-14), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051852890 *

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