WO2021026681A1 - Système et procédé d'utilisation de ressources dans des communications de liaison latérale - Google Patents

Système et procédé d'utilisation de ressources dans des communications de liaison latérale Download PDF

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Publication number
WO2021026681A1
WO2021026681A1 PCT/CN2019/099958 CN2019099958W WO2021026681A1 WO 2021026681 A1 WO2021026681 A1 WO 2021026681A1 CN 2019099958 W CN2019099958 W CN 2019099958W WO 2021026681 A1 WO2021026681 A1 WO 2021026681A1
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Prior art keywords
message
wireless communication
timer
communication device
resources
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PCT/CN2019/099958
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English (en)
Inventor
Wei Luo
Lin Chen
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Zte Corporation
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Publication date
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Priority to CN201980099201.2A priority Critical patent/CN114258717A/zh
Priority to PCT/CN2019/099958 priority patent/WO2021026681A1/fr
Publication of WO2021026681A1 publication Critical patent/WO2021026681A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • 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
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • 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

  • the disclosure relates generally to wireless communications and, more particularly, to systems and methods for using resources in sidelink communications.
  • Sidelink (SL) communication is a wireless radio communication directly between two or more user equipment devices (hereinafter “UE” ) .
  • UE user equipment devices
  • two or more UEs that are geographically proximate to each other can directly communicate without going through an eNode or a base station (hereinafter “BS” ) , or a core network.
  • Data transmission in sidelink communications is thus different from typical cellular network communications, which transmit data to a BS (i.e., uplink transmissions) or receive date from a BS (i.e., downlink transmissions) .
  • data is transmitted directly from a source UE to a target UE through the Unified Air Interface, e.g., PC5 interface, without passing through a BS.
  • Unified Air Interface e.g., PC5 interface
  • example embodiments disclosed herein are directed to solving the issues relating to one or more of the problems presented in the prior art, as well as providing additional features that will become readily apparent by reference to the following detailed description when taken in conjunction with the accompany drawings.
  • example systems, methods, devices and computer program products are disclosed herein. It is understood, however, that these embodiments are presented by way of example and are not limiting, and it will be apparent to those of ordinary skill in the art who read the present disclosure that various modifications to the disclosed embodiments can be made while remaining within the scope of this disclosure.
  • a method performed by a sidelink communication device includes determining, by one of a group of sidelink communication devices, whether resources were previously allocated for the sidelink communication device and continuing, by the sidelink communication device based on an operation status of a timer, using the resources.
  • the timer includes at least one of a T310 timer or a T311 timer. In some embodiments, the method further includes determining the operation status of the T310 timer or the T311 timer as running, determining whether a cell at which the sidelink communication device detects a physical layer problem or a radio link failure has transmitted a message including the information of allowing to continue using the resources, and continuing, based on the determinations, using the resources.
  • a method performed by a sidelink communication device includes receiving, by one of a group of sidelink communication devices from a wireless communication node, a message indicating a timer and a constant value associated with the timer, determining, by the sidelink communication device, whether the timer is expired based on the constant value, and stopping, by the sidelink communication device in response to the determination, using the resources that were previously allocated for the sidelink communication device.
  • the method further includes starting the timer upon detecting a physical layer problem and stopping, upon at least one of: receiving N311 consecutive in-sync indications from a lower layer for a special cell (SpCell) , receiving an RRCReconfiguration message with an reconfigurationWithSync message for a cell group, or initiating a connection reestablishment procedure, the timer to determine whether the timer is expired.
  • SpCell special cell
  • a method performed by a sidelink communication device includes receiving, by one of a group of sidelink communication devices from a wireless communication node, a message indicating a resource threshold or a time threshold, determining, by the sidelink communication device, whether the wireless communication device has not sent data for consecutive configured resources that satisfy the resource threshold or for consecutive time durations that satisfy the time threshold, and stopping, by the sidelink communication device in response to the determination, using the resources that were previously allocated for the wireless communication device.
  • a method performed by a sidelink communication device includes receiving, by one of a group of sidelink communication devices from a wireless communication node, a message through an RRC message or system information, continuing, by the sidelink communication device based on determining whether a first condition indicated in the message is met, using resources that were previously allocated for the sidelink communication device, and stopping, by the sidelink communication device based on determining whether a second condition indicated in the message is met, using the resources that were previously allocated for the sidelink communication device.
  • the first condition includes at least one of whether the sidelink communication device enters into an RRC idle state, whether a DataInactivityTimer is expired, or whether releasing RRC connection is instructed from a higher layer.
  • the second condition includes at least one of whether the sidelink communication device has not sent data for consecutive configured resources that satisfy a resource threshold indicated in the message or for consecutive time durations that satisfy a time threshold indicated in the message, whether a timer indicated in the message is expired, or whether the sidelink communication device reselects to a cell different from a cell to which the sidelink communication device was previously connected.
  • a method performed by a sidelink communication device includes determining, by a first one of a group of sidelink communication devices, a radio link status between the first sidelink communication device and a second one of the group of sidelink communication devices and transmitting, by the first sidelink communication device to a wireless communication node, a signal indicating the radio link status between the first and second sidelink communication devices.
  • a method performed by a sidelink communication device includes receiving, by one of a group of sidelink communication devices from a wireless communication node, a message.
  • the message indicates a resource and further indicates a data type, a logic channel type, or a logic channel group type assigned for the resource.
  • the method includes transmitting, by the sidelink communication device, data using the resource based on the data type, the logic channel type, or the logic channel group type.
  • the message is received via downlink control information or an RRC message.
  • a method performed by a sidelink communication device includes receiving, by one of a group of sidelink communication devices from a wireless communication node, a message.
  • the message indicates the an initial transmission of a first medium access control (MAC) packet data unit (PDU) , when meeting a condition, is allowed to use a resource that was allocated for a retransmission of a second MAC PDU.
  • the method includes transmitting, by the wireless communication device, data using the resource based on the indicated message.
  • MAC medium access control
  • the condition includes that the first MAC PDU includes data belonging to at least one of a list of Quality of Service (Qos) , a list of logic channel identifier (LCID) , or a list of logic channel group identifier (LCGID) .
  • Qos Quality of Service
  • LCID logic channel identifier
  • LGID logic channel group identifier
  • FIG. 1A illustrates an example wireless communication network, in accordance with an embodiment of the present disclosure.
  • FIG. 1B illustrates a block diagram of an example wireless communication system for transmitting and receiving downlink, uplink, and/or sidelink communication signals, in accordance with some embodiments of the present disclosure.
  • FIG. 2 is a flow diagram illustrating an example process for using resources in sidelink communications, in accordance with some embodiments of the present disclosure.
  • FIG. 3 is a flow diagram illustrating an example process for using resources in sidelink communications, in accordance with some embodiments of the present disclosure.
  • FIG. 4 is a flow diagram illustrating an example process for using resources in sidelink communications, in accordance with some embodiments of the present disclosure.
  • FIG. 5 is a flow diagram illustrating an example process for using resources in sidelink communications, in accordance with some embodiments of the present disclosure.
  • FIG. 6 is a flow diagram illustrating an example process for using resources in sidelink communications, in accordance with some embodiments of the present disclosure.
  • FIG. 7 is a flow diagram illustrating an example process for using resources in sidelink communications, in accordance with some embodiments of the present disclosure.
  • FIG. 8 is a flow diagram illustrating an example process for using resources in sidelink communications, in accordance with some embodiments of the present disclosure.
  • a network side communication node or a base station can include a next Generation Node B (gNB) , an E-utran Node B (also known as Evolved Node B, eNodeB or eNB) , a pico station, a femto station, a Transmission/Reception Point (TRP) , an Access Point (AP) , or the like.
  • gNB next Generation Node B
  • E-utran Node B also known as Evolved Node B, eNodeB or eNB
  • TRP Transmission/Reception Point
  • AP Access Point
  • a terminal side node or a user equipment can include a long range communication system such as, for example, a mobile device, a smart phone, a personal digital assistant (PDA) , a tablet, a laptop computer, or a short range communication system such as, for example a wearable device, a vehicle with a vehicular communication system, or the like.
  • a network side and a terminal side communication node are represented by a BS 102 and a UE 104a or 104b, respectively, and in the embodiments in this disclosure hereafter.
  • the BS 102 and UE 104a/104b are sometimes referred to as “wireless communication node” and “wireless communication device, ” respectively.
  • Such communication nodes/devices can perform wireless and/or wired communications.
  • the BS 102 can define a cell 101 in which the UEs 104a-b are located.
  • the UE 104a can include a vehicle that is moving within a coverage of the cell 101.
  • the UE 104a can communicate with the BS 102 via a communication channel 103a.
  • the UE 104b can communicate with the BS 102 via a communication channel 103b.
  • the UEs 104a-b can communicate with each other via a communication channel 105.
  • the communication channels (e.g., 103a-b) between the UE and the BS can be through interfaces such as an Uu interface, which is also known as UMTS (Universal Mobile Telecommunication System (UMTS) air interface.
  • UMTS Universal Mobile Telecommunication System
  • the communication channels (e.g., 105) between the UEs can be through a PC5 interface, which is introduced to address high moving speed and high density applications such as, for example, Vehicle-to-Vehicle (V2V) communications, Vehicle-to-Pedestrian (V2P) communications, Vehicle-to-Infrastructure (V2I) communications, Vehicle-to-Network (V2N) communications, or the like.
  • V2V Vehicle-to-Vehicle
  • V2P Vehicle-to-Pedestrian
  • V2I Vehicle-to-Infrastructure
  • V2N Vehicle-to-Network
  • V2X Vehicle-to-Everything
  • the communications channels between the UEs can be used in Device-to-Device (D2D) communications while remaining within the scope of the present disclosure.
  • the BS 102 is connected to a core network (CN) 108 through an external interface 107, e.g., an Iu interface.
  • CN core network
  • FIG. 1B illustrates a block diagram of an example wireless communication system 150 for transmitting and receiving downlink, uplink and sidelink communication signals, in accordance with some embodiments of the present disclosure.
  • the system 150 may include components and elements configured to support known or conventional operating features that need not be described in detail herein.
  • the system 150 can transmit and receive data symbols in a wireless communication environment such as the wireless communication network 100 of FIG. 1A, as described above.
  • the system 150 generally includes the BS 102 and UEs 104a-b, as described in FIG. 1A.
  • the BS 102 includes a BS transceiver module 110, a BS antenna 112, a BS memory module 116, a BS processor module 114, and a network communication module 118, each module being coupled and interconnected with one another as necessary via a data communication bus 120.
  • the UE 104a includes a UE transceiver module 130a, a UE antenna 132a, a UE memory module 134a, and a UE processor module 136a, each module being coupled and interconnected with one another as necessary via a data communication bus 140a.
  • the UE 104b includes a UE transceiver module 130b, a UE antenna 132b, a UE memory module 134b, and a UE processor module 136b, each module being coupled and interconnected with one another as necessary via a data communication bus 140b.
  • the BS 102 communicates with the UEs 104a-b via one or more of a communication channel 150, which can be any wireless channel or other medium known in the art suitable for transmission of data as described herein.
  • the system 150 may further include any number of modules other than the modules shown in FIG. 1B.
  • the various illustrative blocks, modules, circuits, and processing logic described in connection with the embodiments disclosed herein may be implemented in hardware, computer-readable software, firmware, or any practical combination thereof.
  • various illustrative components, blocks, modules, circuits, and steps are described generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware, or software depends upon the particular application and design constraints imposed on the overall system. Those familiar with the concepts described herein may implement such functionality in a suitable manner for each particular application, but such implementation decisions should not be interpreted as limiting the scope of the present disclosure.
  • a wireless transmission from an antenna of one of the UEs 104a-b to an antenna of the BS 102 is known as an uplink transmission
  • a wireless transmission from an antenna of the BS 102 to an antenna of one of the UEs 104a-b is known as a downlink transmission.
  • each of the UE transceiver modules 130a-b may be referred to herein as an uplink transceiver, or UE transceiver.
  • the uplink transceiver can include a transmitter and receiver circuitry that are each coupled to the respective antenna 132a-b.
  • a duplex switch may alternatively couple the uplink transmitter or receiver to the uplink antenna in time duplex fashion.
  • the BS transceiver module 110 may be herein referred to as a downlink transceiver, or BS transceiver.
  • the downlink transceiver can include RF transmitter and receiver circuitry that are each coupled to the antenna 112.
  • a downlink duplex switch may alternatively couple the downlink transmitter or receiver to the antenna 112 in time duplex fashion.
  • the operations of the transceivers 110 and 130a-b are coordinated in time such that the uplink receiver is coupled to the antenna 132a-b for reception of transmissions over the wireless communication channel 150 at the same time that the downlink transmitter is coupled to the antenna 112.
  • the UEs 104a-b can use the UE transceivers 130a-b through the respective antennas 132a-b to communicate with the BS 102 via the wireless communication channel 150.
  • the wireless communication channel 150 can be any wireless channel or other medium known in the art suitable for downlink (DL) and/or uplink (UL) transmission of data as described herein.
  • the UEs 104a-b can communicate with each other via a wireless communication channel 170.
  • the wireless communication channel 170 can be any wireless channel or other medium known in the art suitable for sidelink transmission of data as described herein.
  • Each of the UE transceiver 130a-b and the BS transceiver 110 are configured to communicate via the wireless data communication channel 150, and cooperate with a suitably configured antenna arrangement that can support a particular wireless communication protocol and modulation scheme.
  • the UE transceiver 130a-b and the BS transceiver 110 are configured to support industry standards such as the Long Term Evolution (LTE) and emerging 5G standards, or the like. It is understood, however, that the present disclosure is not necessarily limited in application to a particular standard and associated protocols. Rather, the UE transceiver 130a-b and the BS transceiver 110 may be configured to support alternate, or additional, wireless data communication protocols, including future standards or variations thereof.
  • LTE Long Term Evolution
  • 5G 5G
  • the processor modules 136a-b and 114 may be each implemented, or realized, with a general purpose processor, a content addressable memory, a digital signal processor, an application specific integrated circuit, a field programmable gate array, any suitable programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein.
  • a processor may be realized as a microprocessor, a controller, a microcontroller, a state machine, or the like.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other such configuration.
  • the steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in firmware, in a software module executed by processor modules 114 and 136a-b, respectively, or in any practical combination thereof.
  • the memory modules 116 and 134a-b may be realized as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
  • the memory modules 116 and 134a-b may be coupled to the processor modules 114 and 136a-b, respectively, such that the processors modules 114 and 136a-b can read information from, and write information to, memory modules 116 and 134a-b, respectively.
  • the memory modules 116 and 134a-b may also be integrated into their respective processor modules 114 and 136a-b.
  • the memory modules 116 and 134a-b may each include a cache memory for storing temporary variables or other intermediate information during execution of instructions to be executed by processor modules 114 and 136a-b, respectively.
  • Memory modules 116 and 134a-b may also each include non-volatile memory for storing instructions to be executed by the processor modules 114 and 136a-b, respectively.
  • the network interface 118 generally represents the hardware, software, firmware, processing logic, and/or other components of the BS 102 that enable bi-directional communication between BS transceiver 110 and other network components and communication nodes configured to communication with the BS 102.
  • the network interface 118 may be configured to support internet or WiMAX traffic.
  • the network interface 118 provides an 802.3 Ethernet interface such that BS transceiver 110 can communicate with a conventional Ethernet based computer network.
  • the network interface 118 may include a physical interface for connection to the computer network (e.g., Mobile Switching Center (MSC) ) .
  • MSC Mobile Switching Center
  • the terms “configured for” or “configured to” as used herein with respect to a specified operation or function refers to a device, component, circuit, structure, machine, signal, etc. that is physically constructed, programmed, formatted and/or arranged to perform the specified operation or function.
  • the network interface 118 can allow the BS 102 to communicate with other BSs or core network over a wired or wireless connection.
  • each of the UEs 104a-b can operate in a hybrid communication network in which the UE communicates with the BS 102, and with other UEs, e.g., between 104a and 104b.
  • the UEs 104a-b support sidelink communications with other UE’s as well as downlink/uplink communications between the BS 102 and the UEs 104a-b.
  • the sidelink communication allows the UEs 104a-b to establish a direct communication link with each other, or with other UEs from different cells, without requiring the BS 102 to relay data between UEs.
  • a BS e.g., the BS 102
  • the UE fails the radio link continuing to use the resource may bring a resource collision and stopping to use this resource results in low resource utilization.
  • the present disclosure proposes a solution to resolve this problem.
  • Sidelink is a unilateral communication (e.g., a direct communication) service between two terminals (e.g., UE 104a and UE 104b) .
  • Vehicle networking refers to a large system network for wireless communication and information exchange between vehicles and vehicles, vehicles and pedestrians, vehicles and roadside equipment, and vehicles and the Internet, in accordance with agreed communication protocols and data interaction standards. Communication through the Internet of Vehicles enables vehicles to achieve driving safety, improve traffic efficiency, and access convenience or entertainment information.
  • car networking communication includes three different types: vehicle-to-vehicle communication (V2V) , communication between vehicles and roadside equipment/network infrastructure (Vehicle-To-Infrastructure/Vehicle-to-Network (V2I/V2N for short) , and Vehicle-to-Pedestrian (V2P) , collectively referred to as V2X communication.
  • V2V vehicle-to-vehicle communication
  • V2I/V2N Vehicle-to-Pedestrian
  • V2X communication Vehicle-to-Pedestrian
  • the V2X communication method is one of the implementation methods of the V2X standard, that is, the service data is not forwarded by the BS or the core network, and is directly transmitted by the source UE (e.g., the 104a) to the target UE (e.g., UE the 104b) through the air interface (e.g., the channel 105) , as shown in FIG. 1.
  • the V2X communication method is referred to as PC5-based V2X communication or V2X sidelink communication.
  • V2X communication scenario is further extended and has higher performance requirements.
  • Advanced V2X services are divided into four main categories: vehicle platooning, extended sensors, advanced driving (semi-automated or full-automated driving) , and remote driving.
  • Performance requirements can include a packet size supports 50 to 12000 bytes, a transmission rate 2 to 50 messages per second, a maximum end-to-end delay of 3-500 milliseconds, a reliability of 90%-99.999%, a data rate of 0.5-1000 Mbps, and a transmission range supporting 50-1000 meters.
  • 3GPP has established research on vehicle networking communication based on fifth-generation mobile communication technology (5G, 5th Generation) , including 5G air interface-based car networking communication and 5G sidelink car network communication.
  • 5G, 5th Generation fifth-generation mobile communication technology
  • the present disclosure proposes a resource allocation scheme based on a 5G sidelink.
  • the UE can continue to use the SL configured grant resource.
  • the present disclosure proposes a solution, in some embodiments, for continuing to use the already configured SL resource and how to release the resource after the RLF or the RRC idle state is met, thereby reducing the probability of resource collision and reducing the transmission delay and improve resource utilization.
  • One challenge is how to negotiate between the UE and the BS to ensure that the BS does not allocate the resources to other UEs when the configured grant resource is used by the UE.
  • the BS can obtain the information (regarding the release) and reallocate the resources.
  • the RRC re-establishment procedure starts after the RLF occurs. If the reselected cell is the original (e.g., source) cell, it is reasonable to continue using the previously configured PC5 configured grant resource, but if the reconstructed cell is a new cell, the UE may have left a coverage of the source cell. In this case, it is not suitable to continue using the resources configured by the source cell. Therefore, if the reselected cell is a new cell, in some embodiments of the present disclosure, the UE stops using the PC5 configured grant resource of the source cell.
  • the UE continues using the PC5 configured grant resource. Specifically, if the UE is configured with the configured grant resource, the UE can used the PC5 configured grant resource based on an operation status of a timer, such as T301, T304, T310, or T311, among others.
  • the operation status may include that the timer is running.
  • each timer has a start condition to start running, a stop condition to stop running.
  • the start condition of the T310 timer is the UE detecting physical layer problems for a primary cell (PCell) e.g. receiving N310 consecutive out-of-sync indications from lower layers (e.g., a MAC layer) .
  • the stop condition of the T310 timer is the UE receiving N311 consecutive in-sync indications from lower layers for PCell, triggering a handover procedure, and initiating an RRC connection re-establishment procedure.
  • the start condition of the T311 timer is the UE initiating the RRC connection re-establishment procedure.
  • the stop condition of the T311 timer is the UE selecting a suitable E-UTRA cell or a cell (to which the UE is connected) using another radio access technology (RAT) , e.g., to ensure having valid SIB.
  • RAT radio access technology
  • the start condition of the T301 timer is the UE transmitting an RRC Connection re-establishment request.
  • the stop condition of the T301 timer is the UE receiving an RRC connection re-establishment message or an RRC connection re-establishment reject message as well as when the selected cell becomes unsuitable due to some reasons.
  • the resource can continue to be used until the connection is successfully reestablished.
  • the source cell is the cell to which the UE is connected before the UE has the RLF or goes to the RRC idle state.
  • the target cell is the cell on which the UE initiates reestablishment after the RLF occurs.
  • the BS can send an RRCConnectionReconfiguration message to indicate whether the UE can stop or update the configured grant resource. If the selected target cell is a new cell, the UE can stop using the configured grant resource.
  • the start condition of the T304 timer is the UE receiving the RRCConnectionReconfiguration message including mobility control information. In some embodiments, the stop condition of the T304 timer is upon successful completion of random access on the corresponding SpCell.
  • the new configured grant resource is included in the mobility control information V2X (e.g., MobilityControlInfoV2X) in the RRCConnectionReconfiguration message or in a v2x-InterFreqInfoList for the concerned frequency in the RRCConnectionReconfiguration message, then the new configured grant resource is used. If the configured grant allowed indication is included in the mobilityControlInfoV2X in the RRCConnectionReconfiguration or in the v2x-InterFreqInfoList for the concerned frequency in the RRCConnectionReconfiguration, then the UE can continue to use the original configured grant resource.
  • V2X mobility control information
  • V2X MobilityControlInfoV2X
  • the UE can continue to use the original configured grant resource.
  • FIG. 2 is a flow diagram illustrating an example process 200 for using resources in sidelink communications, in accordance with some embodiments of the present disclosure.
  • the process 200 can be performed by a sidelink communication device (e.g., the UE 104a or the UE 104b) . Additional, fewer, or different operations may be performed in the process 200 depending on the embodiment.
  • the sidelink communication device determines whether resources were previously allocated for the sidelink communication device (202) .
  • the sidelink communication device continues, based on an operation status of a timer, using the resources (204) .
  • the timer includes a T310, T311, T301, or a T304 timer.
  • the sidelink communication device determines the operation status of the timer as running. In some embodiments, the sidelink communication device determines whether a cell (e.g., a primary cell) at which the sidelink communication device detects a physical layer problem or a radio link failure has transmitted a message including the information of allowing to continue using the resources. In some embodiments, the sidelink communication device determines whether a cell on which the sidelink communication device initiated a re- establishment is a source cell to which the sidelink communication device was previously connected.
  • a cell e.g., a primary cell
  • the sidelink communication device determines whether an RRCConnectionReconfiguration message includes an indication of allowing to continue using the resources. In some embodiments, the sidelink communication device continues, based on one or more of the determinations (e.g., determining the operation status, determining whether the cell has transmitted the message including the indication to allow the continuing use of the resources, determining whether the cell is the source cell, determining whether the RRCConnectionReconfiguration message includes the indication to allow the continuing use of the resources, among others) , using the resources.
  • the determinations e.g., determining the operation status, determining whether the cell has transmitted the message including the indication to allow the continuing use of the resources, determining whether the cell is the source cell, determining whether the RRCConnectionReconfiguration message includes the indication to allow the continuing use of the resources, among others
  • the UE After the UE-to-BS (Uu) RLF occurs, if a security function (e.g., AS function) is activated, the UE performs the RRC re-establishment process. If the cell selected by the UE is not the source cell, the PC5 configured grant resource may stop being used. If the reselected cell is the source cell the PC5 configured grant resource can continue to be used. If the re-establishment is successful, the BS can continue to reserve the RRC configuration for the UE. In some embodiments, if the re-establishment fails, the UE enters the RRC idle state.
  • a security function e.g., AS function
  • the PC5 configured grant resource configured in the source cell may stop being used. If the UE still camps on the source cell, the UE may continue using the PC5 configured grant resources, but may consider when to release, which the base station may be (e.g., simultaneously) informed of.
  • the BS configures a first timer and determines the conditions for the first timer to start and stop. Whether or not the conditions are met may be detected, or otherwise determined by the UE. For example, after the RLF occurs, the BS can synchronize to know when the UE has the RLF.
  • the first timer is started when the UE sends an RRC re-establishment request.
  • the first timer stops counting. In some embodiments, if the re-establishment fails, the first timer continues to count until the first timer expires, and the resource cannot be used again.
  • the UE periodically sends the feedback information, such as a medium access control (MAC) control element (CE) or uplink control information (UCI) , in the normal RRC connection state, and restarts the first timer.
  • the base station receives the feedback information
  • the base station restarts the first timer.
  • the UE does not send the feedback information, and then the configured grant resource can no longer be used after the first timer expires.
  • FIG. 3 is a flow diagram illustrating an example process 300 for using resources in sidelink communications, in accordance with some embodiments of the present disclosure.
  • the process 300 can be performed by a sidelink communication device (e.g., the UE 104a or the UE 104b) . Additional, fewer, or different operations may be performed in the process 300 depending on the embodiment.
  • the sidelink communication device receives, from a wireless communication node (e.g., the BS 102) , a message indicating a timer and a constant value associated with the timer (302) .
  • the timer increments or decrements a count from an initial predetermined value.
  • the sidelink communication device determines whether the timer is expired based on the constant value (304) . In some embodiments, the sidelink communication device compares the count of the timer to the constant value. If the sidelink communication device determines that the count exceeds the constant value (e.g., the count is incremented and becomes greater than the constant value) or if the sidelink communication device determines that the count is decremented to zero (e.g., the count of the timer is initialized as configured constant value and is decremented to zero) , the timer expires, in some embodiments. The sidelink communication device stops, in response to the determination, using the resources that were previously allocated for the sidelink communication device (306) .
  • the sidelink communication device stops, in response to the determination, using the resources that were previously allocated for the sidelink communication device (306) .
  • the sidelink communication device starts the timer upon, at least one of, detecting a physical layer problem, detecting a radio link failure, initiating a connection re-establishment procedure, or transmitting a feedback message in an RRC connected state.
  • the sidelink communication device stops upon, at least one of, receiving N311 consecutive in-sync indications from a lower layer (e.g., a MAC layer) for a special cell (SpCell) , receiving an RRCConnectionReconfiguration message with a reconfigurationWithSync message for a cell group, initiating a connection re-establishment procedure, the timer to determine whether the timer is expired, or receiving an RRC connection re-establishment (e.g., RRCReestablishment) message. In some embodiments, the timer determines whether the timer is expired. In some embodiments, the sidelink communication device receives, from the wireless communication node, a message. In some embodiments, the message indicates information regarding a periodicity and information regarding frequency-domain allocated resources. In some embodiments, the sidelink communication device transmits, to the wireless communication node, the feedback message based on the message.
  • a lower layer e.g., a MAC layer
  • SpCell special cell
  • Whether the UE can continue to use the sidelink (e.g., PC5) configured grant resource to determine is based on the usage of the UE, in some embodiments. In some embodiments, if the UE can has a service to send, the resource can be used. However, in some embodiments, if the UE does not use the PC5 configured grant resource (e.g., the resource does not send data) for consecutive N resources or for consecutive T milliseconds (ms) , the UE releases the resource. The BS can configure another connected UE to detect the PC5 configured grant resource. If the resource does not send data in the consecutive N resources or consecutive T ms, the (e.g. first) UE can report the resource to the BS.
  • the sidelink e.g., PC5 configured grant resource
  • the BS listens to the received signal energy of the configured grant resource location to determine that the PC5 resource is used or not. If the BS learns that the resource has not been used for N consecutive resources or for consecutive T ms, the BS may release the configured grant resource.
  • FIG. 4 is a flow diagram illustrating an example process 400 for using resources in sidelink communications, in accordance with some embodiments of the present disclosure.
  • the process 400 can be performed by a sidelink communication device (e.g., the UE 104a or the UE 104b) . Additional, fewer, or different operations may be performed in the process 400 depending on the embodiment.
  • the sidelink communication device receives, from a wireless communication node, a message indicating a resource threshold or a time threshold (402) .
  • the sidelink communication device determines whether the sidelink communication device has not sent data for consecutive configured resources that satisfy the resource threshold or for consecutive time durations that satisfy the time threshold (404) .
  • the sidelink communication device stops, in response to the determination, using the resources that were previously allocated for the wireless communication device (406) .
  • FIG. 5 is a flow diagram illustrating an example process 500 for using resources in sidelink communications, in accordance with some embodiments of the present disclosure.
  • the process 500 can be performed by a sidelink communication device (e.g., the UE 104a or the UE 104b) . Additional, fewer, or different operations may be performed in the process 500 depending on the embodiment.
  • the sidelink communication device receives, from a wireless communication node, a message through an RRC message or system information (502) .
  • the sidelink communication device continues, based on determining whether a first condition indicated in the message is met, using resources that were previously allocated for the sidelink communication device (504) .
  • the sidelink communication device stops, based on determining whether a second condition indicated in the message is met, using the resources that were previously allocated for the sidelink communication device (506) .
  • the message includes an RRCRelease message.
  • the first condition includes at least one of whether the sidelink communication device enters into an RRC idle state, whether a DataInactivityTimer is expired, or whether releasing RRC connection is instructed from a higher layer.
  • the second condition includes at least one of whether the sidelink communication device has not sent data for consecutive configured resources that satisfy a resource threshold indicated in the message or for consecutive time durations that satisfy a time threshold indicated in the message, whether a timer indicated in the message is expired, or whether the sidelink communication device reselects to a cell different from a cell to which the sidelink communication device was previously connected.
  • UE1 (e.g., the UE 104a) and UE2 (e.g., the UE 104b) establish a sidelink unicast communication connection.
  • the UE1 informs the serving cell of the UE1 that the sidelink RLF indication information has occurred, and the indication information includes at least one of a destination UE identifier (ID) , a destination ID, a link ID, and RLF indication information.
  • the UE may release the allocated resources for the occurrence of the RLF link, including the PC5 configured grant resource or the dynamically scheduled resource.
  • the BS may release the resources allocated to the UE for the RLF link, including the PC5 configured grant resource or the dynamically scheduled resource.
  • FIG. 6 is a flow diagram illustrating an example process 600 for using resources in sidelink communications, in accordance with some embodiments of the present disclosure.
  • the process 600 can be performed by a sidelink communication device (e.g., the UE 104a or the UE 104b) . Additional, fewer, or different operations may be performed in the process 600 depending on the embodiment.
  • a first sidelink communication device determines a radio link status between the first sidelink communication device and a second sidelink communication device (602) .
  • the first sidelink communication device transmits, to a wireless communication node, a signal indicating the radio link status between the first and second sidelink communication devices (604) .
  • the network side can configure the number of retransmissions for the UE per bandwidth part (BWP) .
  • New Radio (NR) V2X has different quality of service (QoS) requirements based on different service types.
  • QoS quality of service
  • Different logical channels, logical channel groups (LCG) , or QoS can be used to configure a different number of transmissions.
  • the BS determines the resource size and the number of transmissions required by each LCG according to a buffer status report (BSR) reported, transmitted, or otherwise provided by the UE, and allocates corresponding resources.
  • BSR buffer status report
  • the UE currently has two LCGs to be sent, which are respectively LCG ID1 and LCG ID2.
  • a corresponding number of transmissions of the LCG ID1 is one, and a number of transmissions corresponding to the LCG ID2 is a number greater than one (e.g., four) .
  • the BS may allocate resources based on a maximum number of transmissions, or may allocate one transmission resource. If based on the maximum number of transmissions, as long as the UE has number of transmissions, corresponding to the LCG, equal to four, the UE can be allocated for resources that can be used for four transmissions. However, when the UE obtains the grant, the UE may generate a transport block (TB) in various ways.
  • TB transport block
  • the UE can assemble the transport block according to the priority order. In a case where the priority corresponding to the LCG ID1 is higher, the UE obtains resources that can be used for four transmissions. If the data (packet data unit (PDU) ) corresponding to the LCG ID1 is assembled preferentially, then the remaining resources may become insufficient for the UE to transmit LCG ID2. In such a scenario, the UE may be subjected to again requesting for resources for four transmissions.
  • PDU packet data unit
  • the UE preferentially sends the data corresponding to the LCG ID2 configured with four transmissions. If there are remaining resources, the data corresponding to the LCG ID1 can be transmitted. If the remaining resources are insufficient, the UE needs to wait for the next grant. As such, the next time the UE may not need to request for four transmission resources. However, if the BS allocates the single transmission resource to the UE, the data corresponding to the LCG ID1 is preferentially assembled. If there are remaining resources, the four transmissions resources can be assembled to transmit LCG ID1 or LCG ID2. If the resources are assembled to transmit LCG ID1, the data is sent several times.
  • the BS may preferentially allocate one transmission resource for the high priority allocate multiple transmission resources for the UE starting at the next slot.
  • the BS informs the UE whether the resource can be used to transmit a data packet that needs to be transmitted multiple times after allocating the transmission resource once. If the resource can be used, the BS may not allocate four times for the subsequent transmission. If the resource is not used, the BS may subsequently allocate resources for which it is allocated four times, and the UE may continue to wait for the next grant.
  • FIG. 7 is a flow diagram illustrating an example process 700 for using resources in sidelink communications, in accordance with some embodiments of the present disclosure.
  • the process 700 can be performed by a sidelink communication device (e.g., the UE 104a or the UE 104b) . Additional, fewer, or different operations may be performed in the process 700 depending on the embodiment.
  • the sidelink communication device receives, from a wireless communication node, a message (702) .
  • the message indicates a resource and further indicates a data type, a logic channel type, or a logic channel group type assigned for the resource.
  • the sidelink communication device transmits data using the resource based on the data type, the logic channel type, or the logic channel group type (704) .
  • the message is received via downlink control information or an RRC message.
  • the data type, the logic channel type, or the logical channel type is configured for using the resource for a single transmission, using the resource for multiple transmissions, or a combination thereof.
  • the retransmitted resource can be used for the new data packet. If the retransmitted resource is reserved without waiting for non-acknowledgement (NACK) feedback, and the retransmitted resource is not used or released, the retransmitted resource can be directly used for the new data packet. If the UE receives non-acknowledgement (NACK) feedback, the UE cannot use the retransmitted resource for other data packets. If the retransmitted resource is used for the new data packet, transmissions, then the number of transmissions configured is not reached, in some embodiments.
  • NACK non-acknowledgement
  • the BS may configure that the QoS or LCID/LCGID corresponding data packets can preempt the allocated retransmission resources to send data preferentially. In some embodiments, the BS may configure that whether the retransmitted resource can be used for other higher priority new data packet transmissions.
  • FIG. 8 is a flow diagram illustrating an example process 800 for using resources in sidelink communications, in accordance with some embodiments of the present disclosure.
  • the process 800 can be performed by a sidelink communication device (e.g., the UE 104a or the UE 104b) . Additional, fewer, or different operations may be performed in the process 800 depending on the embodiment.
  • the sidelink communication device receives, from a wireless communication node, a message (802) .
  • the message indicates the an initial transmission of a first medium access control (MAC) packet data unit (PDU) , when meeting a condition, is allowed to use a resource that was allocated for a retransmission of a second MAC PDU.
  • MAC medium access control
  • PDU packet data unit
  • the sidelink communication device transmits data using the resource based on the indicated message (804) .
  • the condition includes that the first MAC PDU includes data belonging to at least one of: a list of Quality of Service (Qos) , a list of logic channel identifier (LCID) , or a list of logic channel group identifier (LCGID) .
  • Qos Quality of Service
  • LCID logic channel identifier
  • LGID logic channel group identifier
  • any reference to an element herein using a designation such as “first, “ “second, “ and so forth does not generally limit the quantity or order of those elements. Rather, these designations can be used herein as a convenient means of distinguishing between two or more elements or instances of an element. Thus, a reference to first and second elements does not mean that only two elements can be employed, or that the first element must precede the second element in some manner.
  • any of the various illustrative logical blocks, modules, processors, means, circuits, methods and functions described in connection with the aspects disclosed herein can be implemented by electronic hardware (e.g., a digital implementation, an analog implementation, or a combination of the two) , firmware, various forms of program or design code incorporating instructions (which can be referred to herein, for convenience, as "software” or a "software module) , or any combination of these techniques.
  • firmware e.g., a digital implementation, an analog implementation, or a combination of the two
  • firmware various forms of program or design code incorporating instructions
  • software or a “software module”
  • IC integrated circuit
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the logical blocks, modules, and circuits can further include antennas and/or transceivers to communicate with various components within the network or within the device.
  • a general purpose processor can be a microprocessor, but in the alternative, the processor can be any conventional processor, controller, or state machine.
  • a processor can also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other suitable configuration to perform the functions described herein.
  • Computer-readable media includes both computer storage media and communication media including any medium that can be enabled to transfer a computer program or code from one place to another.
  • a storage media can be any available media that can be accessed by a computer.
  • such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer.
  • module refers to software, firmware, hardware, and any combination of these elements for performing the associated functions described herein. Additionally, for purpose of discussion, the various modules are described as discrete modules; however, as would be apparent to one of ordinary skill in the art, two or more modules may be combined to form a single module that performs the associated functions according embodiments of the present solution.
  • memory or other storage may be employed in embodiments of the present solution.
  • memory or other storage may be employed in embodiments of the present solution.
  • any suitable distribution of functionality between different functional units, processing logic elements or domains may be used without detracting from the present solution.
  • functionality illustrated to be performed by separate processing logic elements, or controllers may be performed by the same processing logic element, or controller.
  • references to specific functional units are only references to a suitable means for providing the described functionality, rather than indicative of a strict logical or physical structure or organization.

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

Abstract

L'invention concerne un système et un procédé d'utilisation de ressources dans des communications de liaison latérale. Dans un mode de réalisation, le système et le procédé consistent à déterminer, par un dispositif d'un groupe de dispositifs de communications de liaison latérale, si des ressources ont été préalablement attribuées pour le dispositif de communications de liaison latérale et à continuer à utiliser les ressources, par le dispositif de communications de liaison latérale sur la base d'un état de fonctionnement d'un temporisateur.
PCT/CN2019/099958 2019-08-09 2019-08-09 Système et procédé d'utilisation de ressources dans des communications de liaison latérale WO2021026681A1 (fr)

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