WO2023184481A1 - Procédés et appareils de commande de congestion et de commande de puissance - Google Patents

Procédés et appareils de commande de congestion et de commande de puissance Download PDF

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Publication number
WO2023184481A1
WO2023184481A1 PCT/CN2022/084809 CN2022084809W WO2023184481A1 WO 2023184481 A1 WO2023184481 A1 WO 2023184481A1 CN 2022084809 W CN2022084809 W CN 2022084809W WO 2023184481 A1 WO2023184481 A1 WO 2023184481A1
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WIPO (PCT)
Prior art keywords
sidelink
resource pool
resource
cbr
resources
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PCT/CN2022/084809
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English (en)
Inventor
Zhennian SUN
Haipeng Lei
Xiaodong Yu
Xin Guo
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Lenovo (Beijing) Limited
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Priority to PCT/CN2022/084809 priority Critical patent/WO2023184481A1/fr
Publication of WO2023184481A1 publication Critical patent/WO2023184481A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0289—Congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/343—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading taking into account loading or congestion level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/383—TPC being performed in particular situations power control in peer-to-peer links
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range

Definitions

  • the present disclosure relates to sidelink transmission, and more specifically relates to methods and apparatuses for congestion control and power control when different radio access technologies (RATs) coexist.
  • RATs radio access technologies
  • LTE sidelink and NR sidelink have been studied in the 3rd Generation Partnership Project (3GPP) .
  • LTE sidelink and NR sidelink may be designed to coexist in different channels (e.g., in different bands or adjacent channels) .
  • LTE sidelink and NR sidelink may coexist in the same channel.
  • the design principle is that no change should be made to LTE sidelink. That is, there should be no hardware or specification changes with respect to the LTE sidelink.
  • the industry desires mechanisms for co-channel coexistence of LTE sidelink and NR sidelink.
  • the UE may include: a transceiver; and a processor coupled to the transceiver.
  • the processor may be configured to: receive a first configuration on a first sidelink resource pool associated with a first radio access technology (RAT) and a second configuration on a second sidelink resource pool associated with a second RAT, wherein the first resource pool at least partially overlaps the second resource pool in a time domain; and perform congestion control or power control for a sidelink transmission on a resource in the second resource pool based on a channel busy ratio (CBR) measurement associated with the sidelink transmission, wherein the CBR measurement associated with the sidelink transmission is based on a relation of the resource for the sidelink transmission with respect to the overlapped resources between the first sidelink resource pool and the second sidelink resource pool.
  • CBR channel busy ratio
  • the UE may include: a transceiver; and a processor coupled to the transceiver.
  • the processor may be configured to: receive a first configuration on a first sidelink resource pool associated with a first radio access technology (RAT) and a second configuration on a second sidelink resource pool associated with a second RAT, wherein the first resource pool at least partially overlaps the second resource pool in a time domain; and perform a channel busy ratio (CBR) measurement in the second resource pool based on separate single strength thresholds for an overlapped resource between the first sidelink resource pool and the second sidelink resource pool and a resource within the second resource pool that does not overlap the first resource pool.
  • RAT radio access technology
  • CBR channel busy ratio
  • Some embodiments of the present disclosure provide a method for wireless communication performed by a user equipment (UE) .
  • the method may include: receiving a first configuration on a first sidelink resource pool associated with a first radio access technology (RAT) and a second configuration on a second sidelink resource pool associated with a second RAT, wherein the first resource pool at least partially overlaps the second resource pool in a time domain; and performing congestion control or power control for a sidelink transmission on a resource in the second resource pool based on a channel busy ratio (CBR) measurement associated with the sidelink transmission, wherein the CBR measurement associated with the sidelink transmission is based on a relation of the resource for the sidelink transmission with respect to the overlapped resources between the first sidelink resource pool and the second sidelink resource pool.
  • CBR channel busy ratio
  • the overlapped resources between the first sidelink resource pool and the second sidelink resource pool do not include any physical sidelink feedback channel (PSFCH) resource in the second resource pool.
  • PSFCH physical sidelink feedback channel
  • the first resource pool fully overlaps the second resource pool in a frequency domain. In some embodiments, the first resource pool is within the second resource pool in the frequency domain.
  • the method may further include: in the case that the resource for the sidelink transmission does not overlap any of the overlapped resources between the first sidelink resource pool and the second sidelink resource pool, performing a first CBR measurement for the congestion control based on the resources within the second resource pool that do not overlap the first resource pool, wherein the congestion control is based on a result of the first CBR measurement.
  • the method may further include: in the case that the resource for the sidelink transmission belongs to the overlapped resources between the first sidelink resource pool and the second sidelink resource pool, performing a second CBR measurement for the congestion control based on the overlapped resources between the first sidelink resource pool and the second sidelink resource pool, wherein the congestion control is based on a result of the second CBR measurement.
  • the method may further include: in the case that the resource for the sidelink transmission partially overlaps the overlapped resources between the first sidelink resource pool and the second sidelink resource pool, performing the first and second CBR measurements, wherein the congestion control is based on a larger result of the first and second CBR measurements.
  • the method may further include: in the case that the resource for the sidelink transmission does not overlap any of the overlapped resources between the first sidelink resource pool and the second sidelink resource pool, performing a first channel occupancy ratio (CR) evaluation for the congestion control based on the resources within the second resource pool that do not overlap the first resource pool, wherein the congestion control is further based on a result of the first CR evaluation.
  • CR channel occupancy ratio
  • the method may further include: in the case that the resource for the sidelink transmission belongs to the overlapped resources between the first sidelink resource pool and the second sidelink resource pool, performing a second CR evaluation for the congestion control based on the overlapped resources between the first sidelink resource pool and the second sidelink resource pool, wherein the congestion control is further based on a result of the second CR evaluation.
  • the method may further include: in the case that the resource for the sidelink transmission partially overlaps the overlapped resources between the first sidelink resource pool and the second sidelink resource pool, performing the first and second CR evaluations, wherein the congestion control is based on a larger result of the first and second CR evaluations.
  • the method may further include: in the case that the resource for the sidelink transmission does not overlap any of the overlapped resources between the first sidelink resource pool and the second sidelink resource pool, performing a first CBR measurement for the power control based on the resources within the second resource pool that do not overlap the first resource pool, and determining a maximum transmitting power based on a result of the first CBR measurement.
  • the method may further include: in the case that the resource for the sidelink transmission belongs to the overlapped resources between the first sidelink resource pool and the second sidelink resource pool, performing a second CBR measurement for the power control based on the overlapped resources between the first sidelink resource pool and the second sidelink resource pool, and determining a maximum transmitting power based on a result of the second CBR measurement.
  • the method may further include: in the case that the resource for the sidelink transmission partially overlaps the overlapped resources between the first sidelink resource pool and the second sidelink resource pool, performing the first and second CBR measurements, and determining a maximum transmitting power based on a larger result of the first and second CBR measurements.
  • the method may further include: determining whether the number of slots on which the CBR measurement associated with the sidelink transmission is performed is smaller than or equal to a slot number threshold for a CBR measurement.
  • the method may further include: in response to determining that the number of slots used for the CBR measurement associated with the sidelink transmission is smaller than or equal to the slot number threshold: using a CBR value as the result of the CBR measurement associated with the sidelink transmission; or measuring a set of slots outside a measurement window of the CBR measurement associated with the sidelink transmission to satisfy the slot number threshold.
  • the slot number threshold may be predefined, preconfigured, or configured by a base station (BS) .
  • the CBR value may be predefined, preconfigured, or configured by a base station (BS) .
  • Some embodiments of the present disclosure provide a method for wireless communication performed by a user equipment (UE) .
  • the method may include: receiving a first configuration on a first sidelink resource pool associated with a first radio access technology (RAT) and a second configuration on a second sidelink resource pool associated with a second RAT, wherein the first resource pool at least partially overlaps the second resource pool in a time domain; and performing a channel busy ratio (CBR) measurement in the second resource pool based on separate single strength thresholds for an overlapped resource between the first sidelink resource pool and the second sidelink resource pool and a resource within the second resource pool that does not overlap the first resource pool.
  • CBR channel busy ratio
  • the apparatus may include: at least one non-transitory computer-readable medium having stored thereon computer-executable instructions; at least one receiving circuitry; at least one transmitting circuitry; and at least one processor coupled to the at least one non-transitory computer-readable medium, the at least one receiving circuitry and the at least one transmitting circuitry, wherein the at least one non-transitory computer-readable medium and the computer executable instructions may be configured to, with the at least one processor, cause the apparatus to perform a method according to some embodiments of the present disclosure.
  • FIG. 1 illustrates a schematic diagram of a wireless communication system in accordance with some embodiments of the present disclosure
  • FIG. 2 illustrates an exemplary frame structure of LTE sidelink in accordance with some embodiments of the present disclosure
  • FIGS. 3 and 4 illustrate an exemplary frame structure of NR sidelink in accordance with some embodiments of the present disclosure
  • FIG. 5 illustrates an exemplary automatic gain control (AGC) issue in accordance with some embodiments of the present disclosure
  • FIGS. 6 and 7 illustrate a flow chart of an exemplary procedure of wireless communications in accordance with some embodiments of the present disclosure.
  • FIG. 8 illustrates a block diagram of an exemplary apparatus in accordance with some embodiments of the present disclosure.
  • Embodiments of the present disclosure may be provided in a network architecture that adopts various service scenarios, for example but not limited to, 3GPP 3G, LTE, LTE-Advanced (LTE-A) , 3GPP 4G, 3GPP 5G NR, 3GPP Release 16 and onwards, etc. It is contemplated that along with the 3GPP and related communication technology development, the terminologies recited in the present disclosure may change, which should not affect the principle of the present disclosure.
  • Embodiments of the present disclosure may relate to coexistence between LTE sidelink and NR sidelink. It is contemplated that all embodiments in the present disclosure are also applicable to similar technical problems in coexistence between other different radio access technologies (RATs) .
  • RATs radio access technologies
  • a UE under NR sidelink scenario and/or LTE sidelink scenario may be referred to as sidelink UE (s) .
  • a sidelink UE which transmits data on a sidelink may be referred to as a UE for transmitting, a transmitting UE, a transmitting sidelink UE, a transmit (Tx) UE, a V2X Tx UE, a sidelink (SL) Tx UE, or the like.
  • a sidelink UE which receives data on a sidelink may be referred to as a UE for receiving, a receiving UE, a receiving sidelink UE, a receive (Rx) UE, a Rx UE, an SL Rx UE, or the like.
  • Sidelink UE may include computing devices, such as desktop computers, laptop computers, personal digital assistants (PDAs) , tablet computers, smart televisions (e.g., televisions connected to the Internet) , set-top boxes, game consoles, security systems (including security cameras) , vehicle on-board computers, network devices (e.g., routers, switches, and modems) , internet of things (IoT) devices, or the like.
  • computing devices such as desktop computers, laptop computers, personal digital assistants (PDAs) , tablet computers, smart televisions (e.g., televisions connected to the Internet) , set-top boxes, game consoles, security systems (including security cameras) , vehicle on-board computers, network devices (e.g., routers, switches, and modems) , internet of things (IoT) devices, or the like.
  • computing devices such as desktop computers, laptop computers, personal digital assistants (PDAs) , tablet computers, smart televisions (e.g., televisions connected to the Internet) , set
  • sidelink UE may include a portable wireless communication device, a smart phone, a cellular telephone, a flip phone, a device having a subscriber identity module, a personal computer, a selective call receiver, or any other device that is capable of sending and receiving communication signals on a wireless network.
  • sidelink UE may include wearable devices, such as smart watches, fitness bands, optical head-mounted displays, or the like.
  • sidelink UE (s) may be referred to as a subscriber unit, a mobile, a mobile station, a user, a terminal, a mobile terminal, a wireless terminal, a fixed terminal, a subscriber station, a user terminal, or a device, or described using other terminology used in the art.
  • sidelink UE (s) may communicate directly with BS (s) via communication signals.
  • a BS under NR sidelink scenario and/or LTE sidelink scenario may be referred to as a base unit, a base, an access point, an access terminal, a macro cell, a Node-B, an enhanced Node B (eNB) , a gNB, a Home Node-B, a relay node, a device, a remote unit, or by any other terminology used in the art.
  • a BS may be distributed over a geographic region.
  • a BS is a part of a radio access network that may include one or more controllers communicably coupled to one or more corresponding base stations.
  • a BS may be generally communicably coupled to one or more packet core networks (PCN) , which may be coupled to other networks, like the packet data network (PDN) (e.g., the Internet) and public switched telephone networks, among other networks.
  • PCN packet core networks
  • PDN packet data network
  • PGW packet data network gateway
  • MME mobility management entity
  • SGW serving gateway
  • PGW packet data network gateway
  • a BS may serve a number of sidelink UEs within a serving area, for example, a cell or a cell sector via a wireless communication link.
  • a BS may communicate directly with one or more sidelink UEs via communication signals.
  • a BS may serve sidelink UEs within a macro cell.
  • Sidelink communication between a Tx UE and an Rx UE under NR sidelink scenario includes groupcast communication, unicast communication, or broadcast communication.
  • FIG. 1 illustrates an exemplary wireless communication system 100 (e.g., a sidelink communication system) in accordance with some embodiments of the present disclosure.
  • a wireless communication system 100 e.g., a sidelink communication system
  • wireless communication system 100 may include a base station (e.g., BS 102) , and some UEs 101 (e.g., UE 101-A, UE 101-B, UE 101-C, and UE 101-D) .
  • UE 101-A and UE 101-B are within the coverage of BS 102, and UE 101-C and UE 101-D are outside the coverage of BS 102.
  • UE 101-A, UE 101-B, UE 101-C, and UE 101-D may perform sidelink unicast transmission, sidelink groupcast transmission, sidelink broadcast transmission, or any combination thereof.
  • UE 101-A, UE 101-B, UE 101-C, and UE 101-D may be referred to as a sidelink UE. It is contemplated that, in accordance with some other embodiments of the present disclosure, a sidelink communication system may include more BSs and more or fewer sidelink UEs.
  • a sidelink communication system may include any type of UE (e.g., a roadmap device, a cell phone, a computer, a laptop, IoT device or other type of device) in accordance with some other embodiments of the present disclosure.
  • UE e.g., a roadmap device, a cell phone, a computer, a laptop, IoT device or other type of device
  • UE 101-A may function as a Tx UE, and UE 101-B, UE 101-C, and UE 101-D may function as Rx UEs.
  • UE 101-A may exchange sidelink messages with UE 101-B or UE 101-C through a sidelink using, for example, NR technology or LTE technology, through PC5 interface as defined in 3GPP specifications.
  • UE 101-A may transmit information or data to another UE (s) within the sidelink communication system through sidelink unicast, sidelink groupcast, or sidelink broadcast. For instance, UE 101-A may transmit data to UE 101-B in a sidelink unicast session.
  • UE 101-A may transmit data to UE 101-B and UE 101-C in a groupcast group by a sidelink groupcast transmission session. Also, UE 101-A may transmit data to UE 101-B and UE 101-C by a sidelink broadcast transmission session.
  • UE 101-B or UE 101-C may function as a Tx UE and transmit information or data
  • UE 101-A may function as an Rx UE and receive information or data from UE 101-B or UE 101-C.
  • BS 102 may define one or more cells, and each cell may have a coverage area. As shown in FIG. 1, both UE 101-A and UE 101-B are within the coverage of BS 102, while UE 101-C and UE 101-D are not. UE 101-A and UE 101-B may transmit information to BS 102 and receive information from BS 102, for example, via a Uu interface.
  • BS 102 as illustrated and shown in FIG. 1 may not be a specific base station, but may be any base station (s) in the sidelink communication system.
  • UE 101-A being within a coverage area of any of the two BSs may be called in the case that UE 101-A is within the coverage of a BS in the sidelink communication system; and only UE 101-A being outside of coverage area (s) of both BSs can be called in the case that UE 101-A is outside of the coverage of a BS in the sidelink communication system.
  • resource allocation mode 1 in which a BS schedules a sidelink resource (s) to be used by a UE for sidelink transmission (s) ; and resource allocation mode 2, in which a UE determines a sidelink transmission resource (s) within sidelink resources configured by a BS or network, preconfigured sidelink resources, or predefined sidelink resources.
  • resource allocation mode 2 a BS does not schedule sidelink resources for a UE.
  • UE 101-A and UE 101-B may operate in resource allocation mode 1 or resource allocation mode 2
  • UE 101-C and UE 101-D may operate in resource allocation mode 2.
  • LTE sidelink and NR sidelink may be deployed in co-channel with dynamic coexistence (e.g., dynamic resource sharing between LTE sidelink and NR sidelink) .
  • dynamic coexistence e.g., dynamic resource sharing between LTE sidelink and NR sidelink
  • several issues including for example, the impact of physical sidelink feedback channel (PSFCH) symbols on a channel busy ratio (CBR) measurement of LTE sidelink; the AGC issue of LTE sidelink (e.g., due to PSFCH symbols) , and CBR measurement accuracy due to different load of slots/subframes when, for example, only a part of sidelink resources is shared between LTE sidelink and NR sidelink
  • PSFCH physical sidelink feedback channel
  • CBR channel busy ratio
  • FIG. 2 illustrates an exemplary frame structure 200 for LTE sidelink according to some embodiments of the present disclosure.
  • 14 symbols are included in a subframe.
  • the 14 symbols may include 9 symbols of a PSSCH, 4 symbols of a demodulation reference signal (DMRS) , and a symbol of a guard interval.
  • DMRS demodulation reference signal
  • the guard time or guard interval is used for transmission and reception transition
  • FIG. 3 illustrates an exemplary frame structure 300 for NR sidelink according to some embodiments of the present disclosure.
  • a physical sidelink feedback channel PSFCH
  • 14 symbols are included in a slot.
  • the 14 symbols may include a symbol of automatic gain control (AGC) , a 2-symbol PSCCH, 10 symbols of a PSSCH, 2 symbols of a DMRS, and a symbol of a guard interval.
  • AGC automatic gain control
  • FIG. 4 illustrates an exemplary frame structure 400 for NR sidelink according to some embodiments of the present disclosure.
  • a PSFCH is included.
  • 14 symbols are included in a slot.
  • the 14 symbols may include a symbol of an AGC, a 3-symbol PSCCH, 6 symbols of a PSSCH, 3 symbols of a DMRS, a symbol of an AGC (PSSCH) , a symbol of a PSFCH, and two symbols of guard intervals.
  • the frame structures for LTE sidelink and NR sidelink are different, and this might bring an AGC issue when LTE sidelink and NR sidelink are deployed in a co-channel with dynamic resource sharing.
  • FIG. 5 illustrates an exemplary AGC issue according to some embodiments of the present disclosure.
  • dynamic resource sharing is applied between an LTE sidelink and an NR sidelink on a slot.
  • the SCS of the NR sidelink is 15 kHz and a PSFCH channel is configured in the NR slot.
  • the frame structure for LTE sidelink is the same as that shown in FIG. 2, and the slot structure for NR sidelink is the same as that shown in FIG. 4.
  • an AGC issue of LTE sidelink reception may occur at symbol location 510 due to the PSFCH symbol for the NR sidelink.
  • CBR and channel occupancy ratio are used to determine the channel status.
  • the CBR may be measured by a sidelink UE, and may be used in the congestion control and power control of a sidelink transmission.
  • the CR may be evaluated by a sidelink UE and may be used to determine the channel occupancy ratio of a UE in a resource pool.
  • the CBR may be defined as the portion of sub-channels in the resource pool whose single strength (e.g., sidelink received signal strength indicator (SL RSSI) ) measured by the UE is greater than a single strength threshold over subframes [n-100, n-1] .
  • the CBR may be measured on symbols 1#-12#within a subframe including symbols #0-#13.
  • the CR may be defined as the total number of sub-channels used for its transmission in subframes [n-a, n-1] and granted in subframes [n, n+b] divided by the total number of configured sub-channels in the resource pool over subframes [n-a, n+b] .
  • the CBR may be defined as the portion of sub-channels in the resource pool whose single strength (e.g., sidelink received signal strength indicator (SL RSSI) ) measured by the UE is greater than a single strength threshold over a CBR measurement window [n-a, n-1] , wherein a is equal to 100 or 100 ⁇ 2 ⁇ slots, and ⁇ denotes the corresponding sub-carrier spacing (SCS) .
  • the single strength threshold may be preconfigured, predefined, indicated by the BS or by the network, etc.
  • the CBR may be measured stating from the 2nd symbol within a sidelink slot (the PSFCH symbols are excluded if a PSFCH is configured for a resource pool) .
  • the CR may be defined as the total number of sub-channels used for its transmission in slots [n-a, n-1] and granted in slots [n, n+b] divided by the total number of configured sub-channels in the transmission pool over slots [n-a, n+b] , wherein a is a positive integer and b is 0 or a positive integer.
  • higher layer parameter e.g., sl-TimeWindowSizeCR as specified in 3GPP specifications
  • the congestion control mechanism may be based on CBR and CR of a resource pool.
  • a UE may be configured with a list of CR limitations (e.g., by higher layer parameter sl-CR-Limit) .
  • the UE shall ensure the following limits for any priority value k:
  • CR (i) is the CR evaluated in slot n-N for the PSSCH transmissions with 'Priority' field in the sidelink control information (SCI) set to i
  • CR Limit (k) corresponds to the CR limitation (e.g., high layer parameter sl-CR-Limit) that is associated with the priority value k and the CBR range which includes the CBR measured in slot n-N, where N is the congestion control processing time.
  • the congestion control processing time N may be based on ⁇ (e.g., SCS of the sidelink channel with which the PSSCH is to be transmitted) and UE processing capability.
  • the power control of a PSSCH and a PSCCH may be upper-bounded by a maximum transmitting power (e.g., P MAX, CBR ) , if configured.
  • a maximum transmitting power e.g., P MAX, CBR
  • a UE may consider the configured maximum transmitting power (e.g., P MAX, CBR ) in its power control.
  • a UE may determine transmit parameters such as the maximum transmitting power based on a CBR measurement.
  • Embodiments of the present disclosure provide solutions to solve the above issues. For example, solutions for avoid an AGC issue when an LTE sidelink and an NR sidelink are deployed in a co-channel are proposed. For example, solutions for congestion control and power control when the LTE sidelink and the NR sidelink are deployed in a co-channel are proposed. More details on the embodiments of the present disclosure will be illustrated in the following text in combination with the appended drawings.
  • configuration restrictions may be applied to the resource pool of an LTE sidelink and an NR sidelink to avoid the AGC issue of LTE sidelink reception and the CBR measurement issue of the LTE sidelink due to the PSFCH channel.
  • one of the following restrictions may be applied to the time domain.
  • Restriction #T1 on a carrier which is dynamically shared between an LTE sidelink and an NR sidelink, only the NR sidelink slot (s) without a PSFCH can be shared between the LTE sidelink and the NR sidelink.
  • an LTE sidelink resource pool may (at least) partially overlap an NR sidelink resource pool in a time domain, and the overlapped resources between the two resource pools may not include any PSFCH resource in the NR sidelink resource pool.
  • the LTE sidelink resource pool may include a part that does not overlap the NR sidelink resource pool and the overlapped resources.
  • an LTE sidelink resource pool should be a subset of NR sidelink slots without a PSFCH in an NR sidelink resource pool.
  • the LTE sidelink resource pool does not include a part that does not overlap the NR sidelink resource pool and includes resources that do not include any PSFCH resource in the NR sidelink resource pool.
  • one of the following restrictions may be applied to the frequency domain.
  • the LTE sidelink and NR sidelink may fully overlap in the frequency domain in the slots configured as shared by the LTE sidelink and NR sidelink.
  • the LTE sidelink resource pool may fully overlap the NR sidelink resource pool in the frequency domain.
  • the LTE sidelink and NR sidelink may partially overlap in the frequency domain in the slots configured as shared by LTE sidelink and NR sidelink.
  • the LTE sidelink resource pool may be within the NR sidelink resource pool in the frequency domain.
  • the NR sidelink may be configured with sub-carrier spacing of 15kHz.
  • the resource pool of the LTE sidelink and the resource pool of the NR sidelink may be configured with separate signaling.
  • the CBR/CR on resources shared with the LTE sidelink (hereinafter, resources #A) and resources not shared with the LTE sidelink (hereinafter, resources #B) may be different.
  • resources #A resources shared with the LTE sidelink
  • resources #B resources not shared with the LTE sidelink
  • only NR traffic is allowed to be transmitted on resources #B, and either LTE traffic or NR traffic can be transmitted on resources #A.
  • the single CBR measurement value of a specific resource for congestion control may not be suitable in this scenario.
  • the following two sets of resources are defined depending on whether a resource is dynamic shared by an LTE sidelink or not.
  • a UE may perform a CBR measurement for each set of resources.
  • a UE may perform CR evaluation for each set of resources.
  • ⁇ Set 1 the resources only for an NR sidelink (e.g., resources #B)
  • ⁇ Set 2 the resources shared by an LTE sidelink and an NR sidelink (e.g., resources #A)
  • the above resources are only related to NR sidelink slots; otherwise, the above resources are two-dimension resources related to the time domain and frequency domain. Details in this regard will be described in the following text.
  • the following text describes the usage of the set of resources for congestion control based on CBR measurement and CR evaluation and power control based on the CBR measurement.
  • a UE when a UE is configured with CR limitations (e.g., by higher layer parameter sl-CR-Limit) and transmits a PSSCH in slot n, the UE shall perform a CR evaluation (s) for congestion control (e.g., in slot n-N) and formula (1) for any priority value k (k ⁇ i) should be satisfied.
  • a CR evaluation s
  • congestion control e.g., in slot n-N
  • formula (1) for any priority value k (k ⁇ i) should be satisfied.
  • the resources on which the CR evaluation is performed may be based on a relation of the resource for sidelink transmission (e.g., slot n) with respect to the overlapped resources between the LTE sidelink resource pool and the NR sidelink resource pool.
  • a relation of the resource for sidelink transmission e.g., slot n
  • the LTE sidelink resource pool and the NR sidelink resource pool may fully overlap in the frequency domain (e.g., Restriction #F1) .
  • slot n i.e., the resource for the PSSCH transmission
  • the associated CR evaluation e.g., in slot n-N
  • resources e.g., sidelink slots
  • slot n is a slot shared by an LTE sidelink (e.g., belongs to Set 2 or resources #A)
  • the associated CR evaluation e.g., in slot n-N
  • resources e.g., sidelink slots
  • the LTE sidelink resource pool and the NR sidelink resource pool may partially overlap in the frequency domain (e.g., Restriction #F2) .
  • the resource for the PSSCH transmission in slot n only occupies the resources not shared by the LTE sidelink (e.g., belongs to Set 1)
  • the associated CR evaluation e.g., in slot n-N
  • the associated CR evaluation (e.g., in slot n-N) is based only on sidelink resources shared by the LTE sidelink (e.g., belonging to Set 2) .
  • the associated CR evaluation (e.g., in slot n-N) is based on both the sidelink resources shared by the LTE sidelink (e.g., belonging to Set 2) and sidelink resources not shared by the LTE sidelink (e.g., belonging to Set 1) .
  • the UE may perform two CR evaluations based on Set 2 and Set 1 respectively, and may use the one with the larger CR result for congestion control.
  • the resources on which the CBR measurement for congestion control may be based on a relation of the resource for sidelink transmission (e.g., slot n) with respect to the overlapped resources between the LTE sidelink resource pool and the NR sidelink resource pool.
  • the LTE sidelink resource pool and the NR sidelink resource pool may fully overlap in the frequency domain (e.g., Restriction #F1) .
  • slot n i.e., the resource for the PSSCH transmission
  • the associated CBR measurement is based only on resources (e.g., sidelink slots) not shared by the LTE sidelink within the CBR measurement window.
  • slot n is a slot shared by LTE sidelink (e.g., belongs to Set 2 or resources #A)
  • the associated CBR measurement e.g., in slot n-N
  • resources e.g., sidelink slots
  • the LTE sidelink resource pool and the NR sidelink resource pool may partially overlap in the frequency domain (e.g., Restriction #F2) .
  • the resource for the PSSCH transmission in slot n only occupies the resources not shared by the LTE sidelink (e.g., belongs to Set 1)
  • the associated CBR measurement e.g., in slot n-N
  • the associated CBR measurement (e.g., in slot n-N) is based only on sidelink resources shared by the LTE sidelink (e.g., belonging to Set 2) within the CBR measurement window.
  • the associated CBR measurement (e.g., in slot n-N) is based on both the sidelink resources shared by the LTE sidelink (e.g., belonging to Set 2) and sidelink resources not shared by the LTE sidelink (e.g., belonging to Set 1) within the CBR measurement window.
  • the UE may perform two CBR measurements based on Set 2 and Set 1 respectively, and may use the one with the larger CBR result for congestion control.
  • the UE may perform power control for a sidelink transmission (e.g., a PSSCH or PSCCH in slot n) based on an associated CBR measurement (e.g., in slot n-N) .
  • a sidelink transmission e.g., a PSSCH or PSCCH in slot n
  • an associated CBR measurement e.g., in slot n-N
  • the resources on which the CBR measurement for power control (e.g., determining the maximum transmitting power) is performed may be based on a relation of the resource for sidelink transmission (e.g., slot n) with respect to the overlapped resources between the LTE sidelink resource pool and the NR sidelink resource pool.
  • the LTE sidelink resource pool and the NR sidelink resource pool may fully overlap in the frequency domain (e.g., Restriction #F1) .
  • slot n i.e., the resource for the sidelink transmission
  • the associated CBR measurement for power control e.g., in slot n-N
  • resources e.g., sidelink slots
  • slot n is a slot shared by LTE sidelink (e.g., belongs to Set 2 or resources #A)
  • the associated CBR measurement for power control e.g., in slot n-N
  • resources e.g., sidelink slots
  • the LTE sidelink resource pool and the NR sidelink resource pool may partially overlap in the frequency domain (e.g., Restriction #F2) .
  • the resource for the sidelink transmission in slot n only occupies the resources not shared by the LTE sidelink (e.g., belongs to Set 1)
  • the associated CBR measurement for power control e.g., in slot n-N
  • the associated CBR measurement for power control (e.g., in slot n-N) is based only on sidelink resources shared by the LTE sidelink (e.g., belonging to Set 2) within the CBR measurement window.
  • the associated CBR measurement for power control (e.g., in slot n-N) is based on both the sidelink resources shared by the LTE sidelink (e.g., belonging to Set 2) and sidelink resources not shared by the LTE sidelink (e.g., belonging to Set 1) within the CBR measurement window.
  • the UE may perform two CBR measurements based on Set 2 and Set 1 respectively, and may use the one with the larger CBR result for power control.
  • the UE may perform a CBR measurement on two sets of slots separately within the CBR measurement window, the number of slots on which the respective CBR measurement is performed (e.g., on which SL RSSI measurements are performed) may be not sufficient to guarantee the accuracy of a CBR measurement.
  • the UE may determine such case, and act on it accordingly.
  • a threshold on the number of slots for a CBR measurement may be preconfigured, predefined, configured by the BS or by the network, etc.
  • slot number threshold When the number of slots for a CBR measurement is smaller than or equal to the slot number threshold, the UE may perform one of the following operations or the like that can be conceived of by persons skilled in the art:
  • ⁇ Option 1 use a CBR value as the result of the CBR measurement, wherein the CBR value may be preconfigured, predefined, configured by the BS or by the network, etc.
  • the UE may additionally measure a set of slots which can be extended outside the CBR measurement window to satisfy the slot number threshold.
  • a UE in a connected state may report the CBR measurements on the two set of resources separately to the network, e.g., a BS such as a gNB, an eNB, or both.
  • a BS such as a gNB, an eNB, or both.
  • separate single strength thresholds may be applied to the above two sets of resources.
  • the separate single strength thresholds may be preconfigured, predefined, indicated by the BS or by the network, etc.
  • single strength threshold #1 may be applied to the resources of the NR sidelink that overlap the LTE sidelink and single strength threshold #2 may be applied to the resources of the NR sidelink that do not overlap the LTE sidelink. For example, when a resource in a CBR measurement window belongs to the overlapped resources between an LTE sidelink and an NR sidelink, single strength threshold #1 may be applied; otherwise, single strength threshold #2 may be applied.
  • FIG. 6 illustrates a flow chart of an exemplary procedure 600 for wireless communications in accordance with some embodiments of the present disclosure. Details described in all of the foregoing embodiments of the present disclosure are applicable for the embodiments shown in FIG. 6.
  • the procedure may be performed by a UE, for example, UE 101 in FIG. 1.
  • a UE may receive a first configuration on a first sidelink resource pool associated with a first RAT (e.g., LTE sidelink) and a second configuration on a second sidelink resource pool associated with a second RAT (e.g., NR sidelink) , wherein the first resource pool may be at least partially overlap the second resource pool in a time domain (e.g., Restriction #T1 or Restriction #T2) .
  • a first RAT e.g., LTE sidelink
  • a second configuration on a second sidelink resource pool associated with a second RAT e.g., NR sidelink
  • the overlapped resources between the first sidelink resource pool and the second sidelink resource pool may not include any PSFCH resource in the second resource pool.
  • the first resource pool may fully overlap the second resource pool in a frequency domain (e.g., Restriction #F1) . In some embodiments, the first resource pool may be within the second resource pool in the frequency domain (e.g., Restriction #F2) .
  • the UE may perform congestion control or power control for a sidelink transmission (e.g., PSSCH or PSCCH) on a resource in the second resource pool based on a CBR measurement associated with the sidelink transmission.
  • a sidelink transmission e.g., PSSCH or PSCCH
  • the CBR measurement associated with the sidelink transmission may be based on a relation of the resource for the sidelink transmission with respect to the overlapped resources between the first sidelink resource pool and the second sidelink resource pool.
  • the UE may perform a first CBR measurement for the congestion control based on the resources within the second resource pool that do not overlap the first resource pool.
  • the congestion control for the sidelink transmission may be based on a result of the first CBR measurement.
  • the UE may perform a second CBR measurement for the congestion control based on the overlapped resources between the first sidelink resource pool and the second sidelink resource pool.
  • the congestion control for the sidelink transmission may be based on a result of the second CBR measurement.
  • the UE may perform the first and second CBR measurements (e.g., occupies both sub-channels shared with an LTE sidelink and sub-channels not shared with an LTE sidelink) .
  • the congestion control for the sidelink transmission may be based on a larger result of the first and second CBR measurements.
  • the UE may perform a first CR evaluation for the congestion control based on the resources within the second resource pool that do not overlap the first resource pool.
  • the congestion control for the sidelink transmission may be further based on based on a result of the first CR evaluation.
  • the UE may perform a second CR evaluation for the congestion control based on the overlapped resources between the first sidelink resource pool and the second sidelink resource pool.
  • the congestion control for the sidelink transmission may be further based on a result of the second CR evaluation.
  • the UE may perform the first and second CR evaluations.
  • the congestion control for the sidelink transmission may be based on a larger result of the first and second CR evaluations.
  • the UE may perform a first CBR measurement for the power control based on the resources within the second resource pool that do not overlap the first resource pool, and determine a maximum transmitting power based on a result of the first CBR measurement.
  • the UE may perform a second CBR measurement for the power control based on the overlapped resources between the first sidelink resource pool and the second sidelink resource pool, and determine a maximum transmitting power based on a result of the second CBR measurement.
  • the UE may perform the first and second CBR measurements, and determine a maximum transmitting power based on a larger result of the first and second CBR measurements.
  • the UE may determine whether the number of slots on which the CBR measurement associated with the sidelink transmission is performed is smaller than or equal to a slot number threshold for a CBR measurement.
  • the slot number threshold may be predefined, preconfigured, or configured by a BS.
  • the UE in response to determining that the number of slots used for the CBR measurement associated with the sidelink transmission is smaller than or equal to the slot number threshold, the UE may: use a CBR value as the result of the CBR measurement associated with the sidelink transmission; or measure a set of slots outside a measurement window of the CBR measurement associated with the sidelink transmission to satisfy the slot number threshold.
  • the CBR value may be predefined, preconfigured, or configured by a BS.
  • FIG. 7 illustrates a flow chart of an exemplary procedure 700 for wireless communications in accordance with some embodiments of the present disclosure. Details described in all of the foregoing embodiments of the present disclosure are applicable for the embodiments shown in FIG. 7.
  • the procedure may be performed by a UE, for example, UE 101 in FIG. 1.
  • a UE may receive a first configuration on a first sidelink resource pool associated with a first RAT (e.g., LTE sidelink) and a second configuration on a second sidelink resource pool associated with a second RAT (e.g., NR sidelink) , wherein the first resource pool at least partially overlaps the second resource pool in a time domain.
  • a first RAT e.g., LTE sidelink
  • a second RAT e.g., NR sidelink
  • the UE may perform a CBR measurement in the second resource pool based on separate single strength thresholds (e.g., an SL RSSI threshold) for an overlapped resource between the first sidelink resource pool and the second sidelink resource pool and a resource within the second resource pool that does not overlap the first resource pool.
  • separate single strength thresholds e.g., an SL RSSI threshold
  • FIG. 8 illustrates a block diagram of an exemplary apparatus 800 according to some embodiments of the present disclosure.
  • the apparatus 800 may include at least one processor 806 and at least one transceiver 802 coupled to the processor 806.
  • the apparatus 800 may be a UE.
  • the transceiver 802 may be divided into two devices, such as a receiving circuitry and a transmitting circuitry.
  • the apparatus 800 may further include an input device, a memory, and/or other components.
  • the apparatus 800 may be a UE.
  • the transceiver 802 and the processor 806 may interact with each other so as to perform the operations with respect to the UE described in FIGS. 1-7.
  • the apparatus 800 may further include at least one non-transitory computer-readable medium.
  • the non-transitory computer-readable medium may have stored thereon computer-executable instructions to cause the processor 806 to implement the method with respect to the UE as described above.
  • the computer-executable instructions when executed, cause the processor 806 interacting with transceiver 802 to perform the operations with respect to the UE described in FIGS. 1-7.
  • a software module may reside in 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 operations or steps of a method may reside as one or any combination or set of codes and/or instructions on a non-transitory computer-readable medium, which may be incorporated into a computer program product.
  • the terms “includes, “ “including, “ or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
  • An element proceeded by “a, “ “an, “ or the like does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.
  • the term “another” is defined as at least a second or more.
  • the term “having” and the like, as used herein, are defined as "including.
  • Expressions such as “A and/or B” or “at least one of A and B” may include any and all combinations of words enumerated along with the expression.
  • the expression “A and/or B” or “at least one of A and B” may include A, B, or both A and B.
  • the wording "the first, " “the second” or the like is only used to clearly illustrate the embodiments of the present application, but is not used to limit the substance of the present application.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

La présente demande concerne des procédés et des appareils de commande de congestion et de commande de puissance. Selon certains modes de réalisation de la divulgation, un UE peut : recevoir une première configuration sur un premier groupe de ressources de liaison latérale associé à une première RAT et une seconde configuration sur un second groupe de ressources de liaison latérale associé à une seconde RAT, le premier groupe de ressources chevauchant au moins partiellement le second groupe de ressources dans un domaine temporel ; et mettre en œuvre une commande de congestion ou une commande de puissance pour une transmission de liaison latérale sur une ressource dans le second groupe de ressources sur la base d'une mesure CBR associée à la transmission de liaison latérale, la mesure CBR associée à la transmission de liaison latérale étant basée sur une relation de la ressource pour la transmission de liaison latérale par rapport aux ressources chevauchées entre le premier groupe de ressources de liaison latérale et le second groupe de ressources de liaison latérale.
PCT/CN2022/084809 2022-04-01 2022-04-01 Procédés et appareils de commande de congestion et de commande de puissance WO2023184481A1 (fr)

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