WO2021226949A1 - Methods and apparatus of interruption for v2x communication - Google Patents

Methods and apparatus of interruption for v2x communication Download PDF

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Publication number
WO2021226949A1
WO2021226949A1 PCT/CN2020/090317 CN2020090317W WO2021226949A1 WO 2021226949 A1 WO2021226949 A1 WO 2021226949A1 CN 2020090317 W CN2020090317 W CN 2020090317W WO 2021226949 A1 WO2021226949 A1 WO 2021226949A1
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Prior art keywords
syncref
directly
synchronized
gnss
sidelink
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PCT/CN2020/090317
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French (fr)
Inventor
Zhixun Tang
Tsang-Wei Yu
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Mediatek Singapore Pte. Ltd.
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Priority to PCT/CN2020/090317 priority Critical patent/WO2021226949A1/en
Priority to CN202110489596.6A priority patent/CN113676865A/en
Priority to TW110117068A priority patent/TWI773317B/en
Publication of WO2021226949A1 publication Critical patent/WO2021226949A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1095—Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H04W56/0015—Synchronization between nodes one node acting as a reference for the others
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment

Definitions

  • This disclosure relates generally to wireless communications, and, more particularly, to methods and apparatus for the interruption of V2X sidelink communications.
  • V2X sidelink (SL) communication may be supported by the unicast, groupcast and broadcast communications.
  • SL V2X sidelink
  • issues to be addressed e.g., the interruption of NR V2X sidelink communication.
  • ⁇ Two synchronization sources that UE switches between are synchronized and they are from different type of sources listed below,
  • the UE behavior in NR will be different with LTE.
  • legacy LTE the design focused on broadcast services. A signal is broadcasted to all surrounding UEs, and a UE needs to monitor all messages received.
  • the UE will have a short interruption duration (1ms) and continue to broadcast the signals with the new timing.
  • the new type of groupcast and unicast communication are introduced. Different to the broadcast communication, the communication is dedicated to one UE with the groupcast or unicast link.
  • a RRC reconfiguration command can initiate or cease the V2X sidelink communication.
  • An interruption to Uu link (WAN) will happen during RRC reconfiguration.
  • the sidelink communication When a UE supports at least NR V2X sidelink and two synchronization sources that UE switches between are not synchronized, for broadcast communication, the sidelink communication will be interrupted with 1ms due to synchronization sources change. For group-cast and unicast communication, the sidelink communication will be ceased due to synchronization source change.
  • the sidelink communication When a UE supports NR V2X sidelink only, the sidelink communication will be interrupted with 1ms due to synchronization sources change. The interruption will happen immediately after reselection synchronization source procedure.
  • the sidelink communication When a UE supports both Uu link (WAN) and NR V2X sidelink, the sidelink communication will be interrupted with 1ms due to synchronization sources change between eNB/gNB and gNB/eNB. The interruption will happen after UE Uu link receiving the handover command on the old PDSCH and before UE sending the new PRACH.
  • FIG. 1 shows an example of V2X sidelink UE sync source change to an asynchronization reference source.
  • FIG. 2 shows an example of interruptions to WAN due to V2X sidelink communication.
  • FIG. 3 shows an example of interruptions to NR V2X sidelink due to LTE V2X sidelink sync. source change.
  • FIG. 4 shows an example of interruptions to LTE and NR Uu link (WAN) due to switching between LTE V2X Sidelink and NR V2X Sidelink.
  • FIG. 5 shows an exemplary block diagram of a UE (a.k.a device) according to an embodiment of the disclosure.
  • FIG. 1 shows an example for V2X sidelink sync source change to an asynchronization reference source.
  • UE0 communicates with UE1 in a gNB network in T1
  • both UE0 and UE1 are synced to gNB with the same timing.
  • T2 UE0 moves outside the gNB coverage and changes the sync. source from gNB to GNSS. If these two sync sources (GNSS and gNB) are not synced, since UE1 doesn’t know any information of sync source change in UE0, the communication will be ceased.
  • GNSS and gNB GNSS and gNB
  • the transmission UE shall cease the communication after detecting radio link failure.
  • the UE When a UE supports NR V2X sidelink only, the UE is allowed to drop NR V2X SL transmission or reception for up to 1 ms when synchronization source is changed:
  • UE is allowed to interruption any NR V2X sidelink signals including PSSCH, PSCCH, PSBCH, PSFCH and SLSS signals.
  • the interruption shall occur immediately after the reselection of V2X synchronization reference source.
  • the interruption shall occur after UE Uu link receiving the handover command on the old PDSCH and before UE sending the new PRACH when UE sync. source changing from gNB to eNB or eNB to gNB.
  • Fig. 2 shows an example of interruptions to WAN due to V2X sidelink communication.
  • a UE capable of V2X sidelink communication may indicate its interest (initiation or termination) in V2X sidelink communication to the connected gNodeB.
  • the UE is allowed an interruption of up to the duration shown in table below on the serving cell (s) during the RRC reconfiguration procedure that includes the V2X sidelink communication configuration setup and release. This interruption is for both uplink and downlink of the serving cell (s) .
  • Fig. 3 shows an example of interruptions to NR V2X sidelink due to LTE V2X sidelink sync. source change.
  • the LTE SL and NR SL in the same ITS band will share a single UL timing.
  • both SL communications shall be dropped to allow UE to adjust the timing.
  • the UE When a UE supports both NR V2X sidelink and LTE V2X sidelink, the UE is allowed to drop NR V2X SL transmission or reception for up to 1ms when LTE V2X sidelink synchronization source is changed:
  • UE is allowed to interruption any NR V2X sidelink signals including PSSCH, PSCCH, PSBCH, PSFCH and SLSS signals.
  • the interruption shall occur at the same time as LTE V2X sidelink synchronization source change.
  • the transmission UE When UE communicates for a NR V2X sidelink unicast and groupcast services and changes its synchronization reference source to another source that is asynchronous to the previous one, the transmission UE shall cease the communication after detecting radio link failure.
  • the UE When a UE supports both NR V2X sidelink and LTE V2X sidelink, the UE is allowed to drop LTE V2X SL transmission or reception for up to 1 ms when NR V2X sidelink synchronization source is changed.
  • NR V2X sidelink synchronization source change to gNB is prohibited when UE supports both NR V2X sidelink and LTE V2X sidelink.
  • Fig. 4 shows an example of interruptions to WAN due to switching between LTE V2X Sidelink and NR V2X Sidelink.
  • the UE is allowed an interruption to the NR Uu link of up to the duration shown in Table 2 on the serving cell (s) during the LTE V2X sidelink and NR V2X sidelink switch.
  • the UE is allowed an interruption to the NR Uu link of up to the duration 2 subframes on the serving cell (s) during the LTE V2X sidelink and NR V2X sidelink switch.
  • the interruption shall not occur before the last LTE SL subframe or NR SL slot switching from and after the first NR SL slot or LTE SL subframe switching to.
  • the previous V2X sidelink communication will be ceased after the switching. This interruption is for both uplink and downlink of the serving cell (s) .
  • the interruption can differentiate with sync. and async. case.
  • the UE is allowed an interruption to the NR Uu link of up to the duration shown in Table 3 on the serving cell (s) during the LTE V2X sidelink and NR V2X sidelink switch.
  • the UE is allowed an interruption to the NR Uu link of up to the duration 2 subframes on the serving cell (s) for async. case and 1 subframe on the serving cell (s) for sync. case during the LTE V2X sidelink and NR V2X sidelink switch.
  • Fig. 5 shows an exemplary block diagram of a UE 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. 5.
  • 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 described above with reference to Figs. 1-4.
  • 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)
  • Health & Medical Sciences (AREA)
  • Computing Systems (AREA)
  • General Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
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Abstract

When a UE supports both Uu link (WAN) and NR V2X sidelink, a RRC reconfiguration command can initiate or cease the V2X sidelink communication. An interruption to Uu link (WAN) will happen during RRC reconfiguration. When a UE supports both LTE V2X sidelink and NR V2X sidelink, there is an interruption to LTE V2X sidelink due to NR V2X sidelink synchronization source change. Also, there is an interruption to NR V2X sidelink due to LTE V2X sidelink synchronization source change. When a UE supports Uu link (WAN), LTE V2X sidelink and NR V2X sidelink, there is an interruption to Uu link due to switching between NR SL and LTE SL. When a UE supports at least NR V2X sidelink and two synchronization sources that UE switches between are not synchronized, for broadcast communication, the sidelink communication will be interrupted with 1ms due to synchronization sources change. For group-cast and unicast communication, the sidelink communication will be ceased due to synchronization source change. When a UE supports both Uu link (WAN) and NR V2X sidelink, the sidelink communication will be interrupted with 1ms due to synchronization sources change between eNB/gNB and gNB/eNB. The interruption will happen after UE Uu link receiving the handover command on the old PDSCH and before UE sending the new PRACH.

Description

METHODS AND APPARATUS OF INTERRUPTION FOR V2X COMMUNICATION
FIELD OF INVENTION
This disclosure relates generally to wireless communications, and, more particularly, to methods and apparatus for the interruption of V2X sidelink communications.
BACKGROUND OF THE INVENTION
In 5G new radio, V2X sidelink (SL) communication may be supported by the unicast, groupcast and broadcast communications. However, there are several issues to be addressed, e.g., the interruption of NR V2X sidelink communication.
Two possible reasons will result in sidelink communication dropping due to sync. source change.
·Two synchronization sources that UE switches between are not synchronized
·Two synchronization sources that UE switches between are synchronized and they are from different type of sources listed below,
oGNSS and gNB/eNB or
oGNSS and SyncRefUE or
ogNB/eNB and SyncRefUE
When two synchronization sources that UE switches between are synchronized and they are from different type of sources, since there is no timing adjustment between switching, it’s reasonable to define a unified interruption requirement due to sync. source change.
However, when two synchronization sources that UE switches between are not synchronized, the UE behavior in NR will be different with LTE. In legacy LTE, the design focused on broadcast services. A signal is broadcasted to all surrounding UEs, and a UE needs to monitor all messages received. Thus, when the sync. source that UE switches between are not sync., the UE will have a short interruption duration (1ms) and continue to broadcast the signals with the new timing.
In NR SL, the new type of groupcast and unicast communication are introduced. Different to the broadcast communication, the communication is dedicated to one UE with the groupcast or unicast link.
SUMMARY OF THE INVENTION
When a UE supports both Uu link (WAN) and NR V2X sidelink, a RRC reconfiguration command can initiate or cease the V2X sidelink communication. An interruption to Uu link (WAN) will happen during RRC reconfiguration.
When a UE supports both LTE V2X sidelink and NR V2X sidelink, there is an interruption to LTE V2X sidelink due to NR V2X sidelink synchronization source change. Also, there is an interruption to NR V2X sidelink due to LTE V2X sidelink synchronization source change. The interruption shall not occur before the last LTE SL subframe or NR SL slot switching from and after the first NR SL slot or LTE SL subframe switching to.
When a UE supports Uu link (WAN) , LTE V2X sidelink and NR V2X sidelink, there is an interruption to Uu link due to switching between NR SL and LTE SL. The interruption will happen not before  the last LTE/NR V2X sidelink subframe/slot switching from and after the first NR/LTE V2X sidelink slot/subframe switching to.
When a UE supports at least NR V2X sidelink and two synchronization sources that UE switches between are not synchronized, for broadcast communication, the sidelink communication will be interrupted with 1ms due to synchronization sources change. For group-cast and unicast communication, the sidelink communication will be ceased due to synchronization source change.
When a UE supports NR V2X sidelink only, the sidelink communication will be interrupted with 1ms due to synchronization sources change. The interruption will happen immediately after reselection synchronization source procedure.
When a UE supports both Uu link (WAN) and NR V2X sidelink, the sidelink communication will be interrupted with 1ms due to synchronization sources change between eNB/gNB and gNB/eNB. The interruption will happen after UE Uu link receiving the handover command on the old PDSCH and before UE sending the new PRACH.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:
FIG. 1 shows an example of V2X sidelink UE sync source change to an asynchronization reference source.
FIG. 2 shows an example of interruptions to WAN due to V2X sidelink communication.
FIG. 3 shows an example of interruptions to NR V2X sidelink due to LTE V2X sidelink sync. source change.
FIG. 4 shows an example of interruptions to LTE and NR Uu link (WAN) due to switching between LTE V2X Sidelink and NR V2X Sidelink.
FIG. 5 shows an exemplary block diagram of a UE (a.k.a device) according to an embodiment of the disclosure.
DETAILED DESCRIPTION
Certain terms are used throughout the description and following claims to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This document does not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to ... " . Also, the term "couple" is intended to mean either an indirect or direct electrical connection. Accordingly, if one device is coupled to another device, that connection may be through a direct electrical connection, or through an indirect electrical connection via other devices and connections. The making and using of the embodiments of the disclosure are discussed in detail below. It should be appreciated, however, that the embodiments can be embodied in a wide variety of specific contexts. The specific embodiments discussed are merely illustrative, and do not limit the scope of the disclosure. Some variations of the embodiments are described. Throughout the various views and  illustrative embodiments, like reference numbers are used to designate like elements.
The following description is of the best-contemplated mode of carrying out the invention. This description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. Note that the 3GPP specifications described herein are used to teach the spirit of the invention, and the invention is not limited thereto.
FIG. 1 shows an example for V2X sidelink sync source change to an asynchronization reference source. When UE0 communicates with UE1 in a gNB network in T1, both UE0 and UE1 are synced to gNB with the same timing. In T2, UE0 moves outside the gNB coverage and changes the sync. source from gNB to GNSS. If these two sync sources (GNSS and gNB) are not synced, since UE1 doesn’t know any information of sync source change in UE0, the communication will be ceased. Thus, when UE communicates for a NR V2X sidelink unicast and groupcast services and changes its synchronization reference source to another source that is asynchronous to the previous one, the transmission UE shall cease the communication after detecting radio link failure.
When a UE supports NR V2X sidelink only, the UE is allowed to drop NR V2X SL transmission or reception for up to 1 ms when synchronization source is changed:
From GNSS
-to syncRef UE that is synchronized to GNSS directly
-to syncRef UE that is synchronized to GNSS in-directly
-to syncRef UE that has the lowest priority
From syncRef UE that is synchronized to GNSS directly
-to GNSS
-to syncRef UE that is synchronized to GNSS in-directly
-to syncRef UE that has the lowest priority
From syncRef UE that is synchronized to GNSS in-directly
-to GNSS
-to syncRef UE that is synchronized to GNSS directly
-to syncRef UE that has the lowest priority
From syncRef UE that has the lowest priority
-to GNSS
-to syncRef UE that is synchronized to GNSS directly
-to syncRef UE that is synchronized to GNSS in-directly
UE is allowed to interruption any NR V2X sidelink signals including PSSCH, PSCCH, PSBCH, PSFCH and SLSS signals. The interruption shall occur immediately after the reselection of V2X synchronization reference source.
When a V2X sidelink UE supports both eNB and gNB, the interruption shall occur after UE Uu link receiving the handover command on the old PDSCH and before UE sending the new PRACH when UE sync. source changing from gNB to eNB or eNB to gNB.
Fig. 2 shows an example of interruptions to WAN due to V2X sidelink communication. A UE capable of V2X sidelink communication may indicate its interest (initiation or termination) in V2X sidelink communication to the connected gNodeB. The UE is allowed an interruption of up to the duration shown in  table below on the serving cell (s) during the RRC reconfiguration procedure that includes the V2X sidelink communication configuration setup and release. This interruption is for both uplink and downlink of the serving cell (s) .
Table 1: Interruption length at V2X RRC reconfiguration
Figure PCTCN2020090317-appb-000001
Fig. 3 shows an example of interruptions to NR V2X sidelink due to LTE V2X sidelink sync. source change. The LTE SL and NR SL in the same ITS band will share a single UL timing. Thus, when one of SL link changes the sync. source between two synchronization sources that are not synchronized, both SL communications shall be dropped to allow UE to adjust the timing.
When a UE supports both NR V2X sidelink and LTE V2X sidelink, the UE is allowed to drop NR V2X SL transmission or reception for up to 1ms when LTE V2X sidelink synchronization source is changed:
From GNSS
-to Serving cell/PCell;
-to SyncRef UE that is not synchronized to GNSS directly or in-directly;
From SyncRef UE that is synchronized to GNSS directly or in-directly
-to Serving cell/PCell;
-to SyncRef UE that is not synchronized to GNSS directly or in-directly;
From Serving cell/PCell
-to GNSS
-to SyncRef UE that is synchronized to GNSS directly or in-directly;
From SyncRef UE that is not synchronized to GNSS directly or in-directly
-to GNSS;
-to SyncRef UE that is synchronized to GNSS directly or in-directly;
UE is allowed to interruption any NR V2X sidelink signals including PSSCH, PSCCH, PSBCH, PSFCH and SLSS signals. The interruption shall occur at the same time as LTE V2X sidelink synchronization source change.
When UE communicates for a NR V2X sidelink unicast and groupcast services and changes its synchronization reference source to another source that is asynchronous to the previous one, the transmission UE shall cease the communication after detecting radio link failure.
When a UE supports both NR V2X sidelink and LTE V2X sidelink, the UE is allowed to drop LTE V2X SL transmission or reception for up to 1 ms when NR V2X sidelink synchronization source is changed.
-From GNSS
oto syncRef UE that is synchronized to GNSS directly
oto syncRef UE that is synchronized to GNSS in-directly
oto gNB/eNB
oto syncRef UE that is synchronized to gNB/eNB directly
oto syncRef UE that is synchronized to gNB/eNB in-directly
oto syncRef UE that has the lowest priority
-From syncRef UE that is synchronized to GNSS directly
oto GNSS
oto syncRef UE that is synchronized to GNSS in-directly
oto gNB/eNB
oto syncRef UE that is synchronized to gNB/eNB directly
oto syncRef UE that is synchronized to gNB/eNB in-directly
oto syncRef UE that has the lowest priority
-From syncRef UE that is synchronized to GNSS in-directly
oto GNSS
oto syncRef UE that is synchronized to GNSS directly
oto gNB/eNB
oto syncRef UE that is synchronized to gNB/eNB directly
oto syncRef UE that is synchronized to gNB/eNB in-directly
oto syncRef UE that has the lowest priority
-From gNB/eNB
oto GNSS
oto syncRef UE that is synchronized to GNSS directly
oto syncRef UE that is synchronized to GNSS in-directly
oto syncRef UE that is synchronized to gNB/eNB directly
oto syncRef UE that is synchronized to gNB/eNB in-directly
oto syncRef UE that has the lowest priority
-From syncRef UE that is synchronized to gNB/eNB directly
oto GNSS
oto syncRef UE that is synchronized to GNSS directly
oto syncRef UE that is synchronized to GNSS in-directly
oto gNB/eNB
oto syncRef UE that is synchronized to gNB/eNB in-directly
oto syncRef UE that has the lowest priority
-From syncRef UE that is synchronized to gNB/eNB in-directly
oto GNSS
oto syncRef UE that is synchronized to GNSS directly
oto syncRef UE that is synchronized to GNSS in-directly
oto gNB/eNB
oto syncRef UE that is synchronized to gNB/eNB directly
oto syncRef UE that has the lowest priority
-From syncRef UE that has the lowest priority
oto GNSS
oto syncRef UE that is synchronized to GNSS directly
oto syncRef UE that is synchronized to GNSS in-directly
oto gNB/eNB
osyncRef UE that is synchronized to gNB/eNB directly
osyncRef UE that is synchronized to gNB/eNB in-directly
Another option is the NR V2X sidelink synchronization source change to gNB is prohibited when UE supports both NR V2X sidelink and LTE V2X sidelink.
Fig. 4 shows an example of interruptions to WAN due to switching between LTE V2X Sidelink and NR V2X Sidelink. When a UE capable of switching between LTE V2X sidelink and NR V2X sidelink, the UE is allowed an interruption to the NR Uu link of up to the duration shown in Table 2 on the serving cell (s) during the LTE V2X sidelink and NR V2X sidelink switch.
The UE is allowed an interruption to the NR Uu link of up to the duration 2 subframes on the serving cell (s) during the LTE V2X sidelink and NR V2X sidelink switch.
The interruption shall not occur before the last LTE SL subframe or NR SL slot switching from and after the first NR SL slot or LTE SL subframe switching to. The previous V2X sidelink communication will be ceased after the switching. This interruption is for both uplink and downlink of the serving cell (s) .
Table 2: Interruption length due to switching between LTE SL and NR SL
Figure PCTCN2020090317-appb-000002
Another option is the interruption can differentiate with sync. and async. case. When a UE capable of switching between LTE V2X sidelink and NR V2X sidelink, the UE is allowed an interruption to the NR Uu link of up to the duration shown in Table 3 on the serving cell (s) during the LTE V2X sidelink and NR V2X sidelink switch.
The UE is allowed an interruption to the NR Uu link of up to the duration 2 subframes on the serving cell (s) for async. case and 1 subframe on the serving cell (s) for sync. case during the LTE V2X sidelink and NR V2X sidelink switch.
Table 3: Interruption length due to switching between LTE SL and NR SL
Figure PCTCN2020090317-appb-000003
Fig. 5 shows an exemplary block diagram of a UE 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. 5. In different examples, 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 described above with reference to Figs. 1-4. 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. For example, 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.
In one example, 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. In addition, 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. For example, 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. For example, 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.
While aspects of the present disclosure have been described in conjunction with the specific embodiments thereof that are proposed as examples, alternatives, modifications, and variations to the examples may be made. Accordingly, embodiments as set forth herein are intended to be illustrative and not limiting. There are changes that may be made without departing from the scope of the claims set forth below.

Claims (15)

  1. A method, comprising:
    When a UE supports NR V2X sidelink only, the UE will drop NR V2X SL transmission or reception for up to 1 ms when synchronization source is changed:
    -From GNSS
    -to syncRef UE that is synchronized to GNSS directly
    -to syncRef UE that is synchronized to GNSS in-directly
    -to syncRef UE that has the lowest priority
    -From syncRef UE that is synchronized to GNSS directly
    -to GNSS
    -to syncRef UE that is synchronized to GNSS in-directly
    -to syncRef UE that has the lowest priority
    -From syncRef UE that is synchronized to GNSS in-directly
    -to GNSS
    -to syncRef UE that is synchronized to GNSS directly
    -to syncRef UE that has the lowest priority
    -From syncRef UE that has the lowest priority
    -to GNSS
    -to syncRef UE that is synchronized to GNSS directly
    -to syncRef UE that is synchronized to GNSS in-directly.
  2. The method of claim 1, wherein the interruption can occurs on any NR V2X sidelink signals including PSSCH, PSCCH, PSBCH, PSFCH and SLSS signals and the interruption shall occur immediately after the reselection of V2X synchronization reference source.
  3. The method of claim 1, wherein the transmission UE shall cease the communication after detecting radio link failure when UE communicates for a NR V2X sidelink unicast and groupcast services and changes its synchronization reference source to another source that is asynchronous to the previous one.
  4. A method, comprising:
    When a UE supports both NR V2X sidelink and NR Uu link (WAN) , the UE will drop NR V2X SL transmission or reception for up to 1ms when synchronization source is changed.
  5. The method of claim 4, wherein the interruption can occurs on any NR V2X sidelink signals including PSSCH, PSCCH, PSBCH, PSFCH and SLSS signals and the interruption shall occur immediately after the reselection of V2X synchronization reference source.
  6. The method of claim 4, wherein the interruption can occurs on any NR V2X sidelink signals including PSSCH, PSCCH, PSBCH, PSFCH and SLSS signals and the interruption shall occur after UE Uu link receiving the handover command on the old PDSCH and before UE sending the new PRACH.
  7. The method of claim 4, wherein the transmission UE shall cease the communication after detecting radio link failure when UE communicates for a NR V2X sidelink unicast and groupcast services and changes its synchronization reference source to another source that is asynchronous to the previous one.
  8. A method, comprising:
    When a UE supports both NR V2X sidelink and NR Uu link (WAN) , the UE will interrupt the NR Uu link (WAN) on the serving cell (s) with the following table during the RRC reconfiguration procedure that includes the V2X sidelink communication configuration message (setup and release) .
    Figure PCTCN2020090317-appb-100001
  9. A method, comprising:
    When a UE supports both NR V2X sidelink and LTE V2X sidelink, the UE is allowed to drop NR V2X SL transmission or reception for up to 1ms when LTE V2X sidelink synchronization source is changed:
    -From GNSS
    -to Serving cell/PCell;
    -to SyncRef UE that is not synchronized to GNSS directly or in-directly;
    -From SyncRef UE that is synchronized to GNSS directly or in-directly
    -to Serving cell/PCell;
    -to SyncRef UE that is not synchronized to GNSS directly or in-directly;
    -From Serving cell/PCell
    -to GNSS
    -to SyncRef UE that is synchronized to GNSS directly or in-directly;
    -From SyncRef UE that is not synchronized to GNSS directly or in-directly
    -to GNSS;
    -to SyncRef UE that is synchronized to GNSS directly or in-directly.
  10. A method, comprising:
    When a UE supports both NR V2X sidelink and LTE V2X sidelink, the UE is allowed to drop LTE V2X SL transmission or reception for up to 1ms when NR V2X sidelink synchronization source is changed:
    -From GNSS
    ○ to syncRef UE that is synchronized to GNSS directly
    ○ to syncRef UE that is synchronized to GNSS in-directly
    ○ to gNB/eNB
    ○ to syncRef UE that is synchronized to gNB/eNB directly
    ○ to syncRef UE that is synchronized to gNB/eNB in-directly
    ○ to syncRef UE that has the lowest priority
    -From syncRef UE that is synchronized to GNSS directly
    ○ to GNSS
    ○ to syncRef UE that is synchronized to GNSS in-directly
    ○ to gNB/eNB
    ○ to syncRef UE that is synchronized to gNB/eNB directly
    ○ to syncRef UE that is synchronized to gNB/eNB in-directly
    ○ to syncRef UE that has the lowest priority
    -From syncRef UE that is synchronized to GNSS in-directly
    ○ to GNSS
    ○ to syncRef UE that is synchronized to GNSS directly
    ○ to gNB/eNB
    ○ to syncRef UE that is synchronized to gNB/eNB directly
    ○ to syncRef UE that is synchronized to gNB/eNB in-directly
    ○ to syncRef UE that has the lowest priority
    -From gNB/eNB
    ○ to GNSS
    ○ to syncRef UE that is synchronized to GNSS directly
    ○ to syncRef UE that is synchronized to GNSS in-directly
    ○ to syncRef UE that is synchronized to gNB/eNB directly
    ○ to syncRef UE that is synchronized to gNB/eNB in-directly
    ○ to syncRef UE that has the lowest priority
    -From syncRef UE that is synchronized to gNB/eNB directly
    ○to GNSS
    ○ to syncRef UE that is synchronized to GNSS directly
    ○ to syncRef UE that is synchronized to GNSS in-directly
    ○ to gNB/eNB
    ○ to syncRef UE that is synchronized to gNB/eNB in-directly
    ○ to syncRef UE that has the lowest priority
    -From syncRef UE that is synchronized to gNB/eNB in-directly
    ○ to GNSS
    ○ to syncRef UE that is synchronized to GNSS directly
    ○ to syncRef UE that is synchronized to GNSS in-directly
    ○ to gNB/eNB
    ○ to syncRef UE that is synchronized to gNB/eNB directly
    ○ to syncRef UE that has the lowest priority
    -From syncRef UE that has the lowest priority
    ○ to GNSS
    ○ to syncRef UE that is synchronized to GNSS directly
    ○ to syncRef UE that is synchronized to GNSS in-directly
    ○ to gNB/eNB
    ○ syncRef UE that is synchronized to gNB/eNB directly
    ○ syncRef UE that is synchronized to gNB/eNB in-directly.
  11. The method of claim 9, wherein UE is allowed to interruption any NR V2X sidelink signals including PSSCH, PSCCH, PSBCH, PSFCH and SLSS signals. The interruption shall occur at the same time as LTE V2X sidelink synchronization source change.
  12. The method of claim 10, wherein UE is allowed to interruption any LTE V2X sidelink signals including PSSCH, PSCCH, PSBCH, PSFCH and SLSS signals. The interruption shall occur at the same time as NR V2X sidelink synchronization source change.
  13. The method of claim 10, wherein the NR V2X sidelink synchronization source change to gNB is prohibited when UE supports both NR V2X sidelink and LTE V2X sidelink.
  14. A method, comprising:
    When a UE capable of switching between LTE V2X sidelink and NR V2X sidelink, the UE is allowed an interruption of up to the duration shown in table below on the serving cell (s) during the LTE V2X sidelink and NR V2X sidelink switch.
    Figure PCTCN2020090317-appb-100002
  15. The method of claim 14, wherein the interruption shall not occur before the last LTE SL subframe or NR SL slot switching from and after the first NR SL slot or LTE SL subframe switching to. The previous V2X sidelink communication will be ceased after the switching.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220240134A1 (en) * 2020-05-21 2022-07-28 Lg Electronics Inc. Sidelink communication

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170215119A1 (en) * 2016-01-22 2017-07-27 Kt Corporation Methods for controlling mobility of user equipment for performing v2x communication and apparatuses for performing the same
US20200092685A1 (en) * 2017-05-04 2020-03-19 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. UE GROUPS, UE GROUP MANAGER UEs AND UE GROUP MEMBER UEs

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017135877A1 (en) * 2016-02-04 2017-08-10 Telefonaktiebolaget Lm Ericsson (Publ) Methods and apparatuses for cellular handovers involving sidelink communications

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170215119A1 (en) * 2016-01-22 2017-07-27 Kt Corporation Methods for controlling mobility of user equipment for performing v2x communication and apparatuses for performing the same
US20200092685A1 (en) * 2017-05-04 2020-03-19 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. UE GROUPS, UE GROUP MANAGER UEs AND UE GROUP MEMBER UEs

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CATT: "Draft CR on interruption requirements for NR V2X", 3GPP DRAFT; R4-2005312, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG4, no. Online Meeting ;20200320 - 20200330, 4 May 2020 (2020-05-04), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051880270 *
LG ELECTRONICS: "Draft CR of interruption for switching between NR SL and LTE SL", 3GPP DRAFT; R4-2004988, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG4, no. Online Meeting ;20200420 - 20200430, 14 April 2020 (2020-04-14), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051876299 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220240134A1 (en) * 2020-05-21 2022-07-28 Lg Electronics Inc. Sidelink communication
US11770746B2 (en) * 2020-05-21 2023-09-26 Lg Electronics Inc. Sidelink communication based on multiple sidelink technologies

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