WO2021030969A1 - Mesure de rlm et rrm pour sl v2x - Google Patents

Mesure de rlm et rrm pour sl v2x Download PDF

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Publication number
WO2021030969A1
WO2021030969A1 PCT/CN2019/101115 CN2019101115W WO2021030969A1 WO 2021030969 A1 WO2021030969 A1 WO 2021030969A1 CN 2019101115 W CN2019101115 W CN 2019101115W WO 2021030969 A1 WO2021030969 A1 WO 2021030969A1
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WO
WIPO (PCT)
Prior art keywords
rlm
rrm
traffic
higher layer
oos
Prior art date
Application number
PCT/CN2019/101115
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English (en)
Inventor
Tao Chen
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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/CN2019/101115 priority Critical patent/WO2021030969A1/fr
Publication of WO2021030969A1 publication Critical patent/WO2021030969A1/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
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • This disclosure relates generally to wireless communications, and, more particularly, to methods and apparatus for radio link monitoring (RLM) and radio resource management (RRM) in communications via SL.
  • RLM radio link monitoring
  • RRM radio resource management
  • the NR sidelink interface also known as the PC5 interface, connects two user equipments (UEs) directly, without passing through a base station (e.g. a gNB) .
  • the sidelink interface may be used to carry a variety of services, including unicast services between a single pair of peer UEs.
  • the peer UEs When traffic is sent from one UE to another as part of a service, the peer UEs may be referred to as the transmitting UE (Tx UE) and the receiving UE (Rx UE) .
  • the Rx UE monitors the condition of the radio link between the two UEs, primarily by evaluating the reception of reference signals (RSs) sent by the Tx UE. If the RSs are received with sufficiently poor signal-and-interference-to-noise ratio (SINR) , the Rx UE may declare an out-of-sync (OOS) condition, while if the RSs are received with a good SINR, the Rx UE may declare an in-sync (IS) condition.
  • SINR signal-and-interference-to-noise ratio
  • IS/OOS indications may be delivered from a lower protocol layer of the Rx UE (for example, a physical (PHY) layer) to an upper layer of the Rx UE (for example, a radio resource control (RRC) layer) , and the upper layer may be responsible for determining when the IS/OOS indications justify declaring a condition of radio link failure (RLF) .
  • the IS/OOS indications may be delivered periodically or aperiodically. This process of monitoring the radio conditions may be referred to as radio link monitoring (RLM) .
  • the RSs for RLM/RRM on the sidelink interface are not necessarily transmitted periodically; for instance, they may be transmitted in association with user traffic, and not transmitted when there is no user traffic.
  • Such an aperiodic transmission scheme poses a challenge for RLM/RRM, because if the Rx UE measures extremely poor SINR, it cannot easily infer whether this means that RSs were sent but lost over the air (indicating bad link conditions) , or that no RSs were sent at all (in which case the link condition may be good) .
  • the present invention describes methods of data transmission on the sidelink interface that facilitate effective RLM/RRM.
  • RLM/RRM on the sidelink interface can be developed based on 2-stage SCI solutions.
  • the sidelink physical data channel can be scheduled by one sidlelink control information (SCI) carried in sidelink physical control channel (PSCCH) .
  • SCI sidlelink control information
  • PSCCH sidelink physical control channel
  • 2-stage SCI with 2 SCIs can be used for SL sensing/scheduling.
  • the 1st SCI is used for sensing and/or broadcast communication whereas the 2nd SCI carrying the remaining information for data scheduling of unicast/groupcast data transmission.
  • the 1 st SCI carrying the sensing information targets the larger coverage for sensing by more UEs than the 2 nd SCI only targeting the intended UEs.
  • the 2nd SCI time/frequency location can be derived from the information fields carried in the 1st SCI.
  • the 1st SCI and 2nd SCI can be time domain multiplexed in different symbols and/or frequency domain multiplexed in different RBs (interleaved or non-interleaved) .
  • the 2 nd SCI can share/use the time/frequency resources reserved for the data channel.
  • the 2nd SCI can have the link adaptation associated with the data channel link adaptation.
  • 2nd SCI can have the same transmission scheme as the data channel with the same antenna port (s) .
  • NR SL RLM/RLM RS in SL has to be confined within the control/data channel (i.e., No standalone RLM-RS) , which implies no periodic and fixed RS transmission due to uncertainty of the control/data transmission.
  • Rx UE has to blindly detect RLM-RS with the risk of no way for differentiation between “no traffic” and “low SINR on RLM-RS” , which will impact RLM evaluation for OoS/IS indication. So it is necessary to have the mechanism to support pre-known RLM-RS for UE to perform RRM/RLM.
  • the UE can perform RRM/RLM RS during the evaluation period assuming there is at least one control/data transmission associated with RRM/RLM RS.
  • RLM/RRM RS can be assumed on a configured/pre-defined period, similar to a keep-alive message, for UE to perform the periodic measurement and report IS/OoS indication to the higher layer. Additionally, UE can be informed about the duration without traffic (e.g., by the timer or explicit singling) . Then UE may stop RRM/RLM monitoring and just report “no RS” or “unknown” status to the higher layer during the period instead of IS/OoS indication.
  • the RS to be used for RRM/RLM measurement it can be based on the DMRS of the SCI (e.g., 1 st SCI and/or 2 nd SCI) or CSI-RS/PTRS confined within the control/data channels with presence/location information indicated by the SCI (e.g., 1 st SCI and/or 2 nd SCI) .
  • the SCI e.g., 1 st SCI and/or 2 nd SCI
  • CSI-RS/PTRS confined within the control/data channels with presence/location information indicated by the SCI (e.g., 1 st SCI and/or 2 nd SCI) .
  • Fig. 1 shows an exemplary block diagram of a UE (a.k.a device) according to an embodiment of the disclosure.
  • Rx UE For Rx UE to perform RLM measurement, it can blindly detect all candidate RS positions which may be (pre) configured associated with the resource pool (pre) configuration or data/control channel (pre) configuration. If there is at least one measurement on the candidate RS higher than IS threshold, it can be declared as IS for indication to the higher layer. If the measurements on all candidate RSs lower than OoS threshold, it can be declared as OoS for indication to the higher layer.
  • the indication interval can be set to be same as the evaluation period to avoid consecutive IS/OoS indications based on the evaluation over the same set of measurements.
  • the UE can perform RRM/RLM RS during the evaluation period assuming there is at least one control/data transmission associated with RRM/RLM RS.
  • the transmission of RLM/RRM RS can be assumed on a configured/pre-defined period, similar to a keep-alive message, for UE to perform the periodic measurement and report IS/OoS indication to the higher layer.
  • UE can be informed about the duration without traffic (e.g., by the timer or explicit singling) . Then UE may stop RRM/RLM monitoring and just report “no RS” or “unknown” status to the higher layer during the period instead of IS/OoS indication.
  • the UE doesn’ t start to DRX during the “no traffic” period, so it is still monitoring in case some traffic comes.
  • the Tx UE may not necessarily know in advance when traffic will resume for irregular services. Then the problematic case is where the link gets lost during the “no traffic” period, so the Rx UE goes into the altered RLM mode (sending “no RS” or “unknown” indications) and never comes out of it. This could be handled with a (long) timer in the Rx UE, or by waiting for the upper-layer keep-alive to fail.
  • Rx UE receives MAC CE carrying the endOftraffic marker and inform the physical layer.
  • the physical layer can perform IS/OoS/unknown evaluation and send the indication) to RRC. In this case, it is still a kind of periodic indication regardless of whether the RLM/RRM RS is known or unknown.
  • Rx UE receives MAC CE carrying the endOfTraffic marker and deliver the no traffic information to RRC layer.
  • RRC layer will instruct the physical layer when/how to perform IS/OoS indication, e.g., only during the active traffic period.
  • periodic indication for IS/OoS is only reported to the higher layer within the evaluation duration indicated by the higher layer by assuming the presence of RLM/RRM-RS transmission in the physical layer.
  • Rx UE receives MAC CE carrying the endOfTraffic marker and deliver the no traffic information to RRC layer.
  • RRC layer will instruct the physical layer when/how to perform IS/OoS indication.
  • periodic indication for IS/OoS i.e., no “unknown” status
  • UE may not perform the measurement but will still report IS to the higher layer for processing.
  • the higher layer can derive whether it is a valid IS or no traffic.
  • UE may report IS or OoS with the traffic status assumed for evaluation. Then the higher layer can combine the traffic status in the higher layer and the physical layer reports to perform RLM/RLF.
  • the RS to be used for RRM/RLM measurement can be based on the DMRS of the SCI (e.g., 1 st SCI and/or 2 nd SCI) or CSI-RS/PTRS confined within the control/data channels with presence and/or location information indicated by the SCI (e.g., 1 st SCI and/or 2 nd SCI) . Due to the larger coverage of the 1 st SCI w/o close-loop MIMO typically, it is more reliable and simple to be used for RLM/RRM measurement for SL maintenance.
  • the SCI e.g., 1 st SCI and/or 2 nd SCI
  • Tx UE based RLM/RRM can be used.
  • Tx UE based RLM there is no need of periodic indication. Instead, the Tx UE can just derive the link quality based on whether it can receive the number of A/Ns as expected. In this case, the aperiodic indication of the IS/OoS can be applied.
  • Fig. 1 shows an exemplary block diagram of a UE 800 according to an embodiment of the disclosure.
  • the UE 800 can be configured to implement various embodiments of the disclosure described herein.
  • the UE 800 can include a processor 810, a memory 820, and a radio frequency (RF) module 830 that are coupled together as shown in Fig. 1.
  • RF radio frequency
  • the UE 800 can be a mobile phone, a tablet computer, a desktop computer, a vehicle carried device, and the like.
  • the processor 810 can be configured to perform various functions of the UE 800 described above with reference to embodiments described before.
  • 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.
  • ASIC application specific integrated circuits
  • FPGA field programmable gate arrays
  • 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

Procédé comprenant les étapes suivantes : recevoir les informations relatives à la présence de RRM/RLM; effectuer une mesure de RLM/RRM sur la base d'emplacements de DMRS pré-configurés et/ou indiqués; et rapporter l'état de RLM/RRM à la couche supérieure en fonction de la présence de RS RRM/RLM. UN RS RLM/RLM SL NR dans SL doit être confiné dans le canal de commande/données (c'est-à-dire, No de RS-RLM autonome), ce qui implique aucune transmission RS périodique et fixe en raison de l'incertitude de la transmission de commande/données. Ainsi, un UE Rx (800) doit détecter de manière aveugle le RS-RLM avec le risque de ne pas faire la différence entre « Pas de trafic » et « faible SINR sur RS-RLM », ce qui aura un impact sur l'évaluation de RLM pour une indication OoS/IS. Il est nécessaire de disposer du mécanisme pour prendre en charge un RS-RLM pour l'UE (800) afin d'effectuer une RRM/RLM. Dans le cas de la transmission de trafic actif, l'UE (800) peut effectuer un RS RRM/RLM pendant la période d'évaluation en supposant qu'Il y a au moins une transmission de commande/données associée à un RS RRM/RLM. Dans le cas d'un trafic inactif, la transmission de RS RLM/RRM peut être supposée sur une période configurée/prédéfinie, similaire à un message de maintien de connexion, pour que l'UE (800) effectue la mesure périodique et rapporte une indication IS/OoS à la couche supérieure. De plus, l'UE (800) peut être informé de la durée sans trafic (par exemple, par le temporisateur ou une signalisation explicite). Ensuite, l'UE (800) peut arrêter la surveillance de RRM/RLM et rapporter uniquement « pas de RS » ou statut « inconnu » à la couche supérieure pendant la période au lieu d'une indication IS/OoS.
PCT/CN2019/101115 2019-08-16 2019-08-16 Mesure de rlm et rrm pour sl v2x WO2021030969A1 (fr)

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CN104469945A (zh) * 2013-09-12 2015-03-25 索尼公司 Nct scc的激活控制装置和方法、管理方法、以及基站装置
CN105163319A (zh) * 2010-10-04 2015-12-16 华为技术有限公司 用于在异构通信***中协调不同类型的基站的***和方法
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WO2018213287A1 (fr) * 2017-05-17 2018-11-22 Qualcomm Incorporated Surveillance de liaison radioélectrique avec sous-bandes et mesures du brouillage
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CN110115008A (zh) * 2016-12-07 2019-08-09 Lg电子株式会社 配置无线通信***中的nr的控制信道的方法和设备

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105163319A (zh) * 2010-10-04 2015-12-16 华为技术有限公司 用于在异构通信***中协调不同类型的基站的***和方法
CN103314614A (zh) * 2011-01-07 2013-09-18 华为技术有限公司 参考信号传输和接收的方法和设备
CN104081813A (zh) * 2012-01-30 2014-10-01 华为技术有限公司 无线通信测量和csi反馈的***和方法
CN104469945A (zh) * 2013-09-12 2015-03-25 索尼公司 Nct scc的激活控制装置和方法、管理方法、以及基站装置
CN107113648A (zh) * 2015-01-30 2017-08-29 三星电子株式会社 用于非授权频谱上的csi测量配置和报告的方法和设备
CN110115008A (zh) * 2016-12-07 2019-08-09 Lg电子株式会社 配置无线通信***中的nr的控制信道的方法和设备
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WO2018213287A1 (fr) * 2017-05-17 2018-11-22 Qualcomm Incorporated Surveillance de liaison radioélectrique avec sous-bandes et mesures du brouillage
US20190141557A1 (en) * 2017-09-11 2019-05-09 Telefonaktiebolaget Lm Ericsson (Publ) Enhanced Measurement Filtering Configurations for Radio-Link Management and Radio Resource Management

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