WO2021258398A1 - Procédé de communication, dispositif terminal et support lisible par ordinateur - Google Patents

Procédé de communication, dispositif terminal et support lisible par ordinateur Download PDF

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Publication number
WO2021258398A1
WO2021258398A1 PCT/CN2020/098338 CN2020098338W WO2021258398A1 WO 2021258398 A1 WO2021258398 A1 WO 2021258398A1 CN 2020098338 W CN2020098338 W CN 2020098338W WO 2021258398 A1 WO2021258398 A1 WO 2021258398A1
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Prior art keywords
resource
terminal device
determining
resources
resource selection
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PCT/CN2020/098338
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English (en)
Inventor
Zhaobang MIAO
Gang Wang
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Nec Corporation
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Priority to PCT/CN2020/098338 priority Critical patent/WO2021258398A1/fr
Priority to CN202080099574.2A priority patent/CN115516883A/zh
Publication of WO2021258398A1 publication Critical patent/WO2021258398A1/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
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/52—Allocation or scheduling criteria for wireless resources based on load
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria

Definitions

  • Embodiments of the present disclosure generally relate to the field of telecommunication, and in particular, to a method for communications, terminal device, and a computer readable medium.
  • V2X communications can be based on communication technologies such as sidelink communication technologies.
  • sidelink resource pools and sidelink channels can be established for vehicles participating in such communications.
  • V2X communications there are two sidelink transmission modes each specifying a manner of resource allocation and selection.
  • a first mode also referred to as NR V2X mode 1 or mode 1 hereinafter
  • one terminal device may perform V2X communications with the other terminal device by using resources allocated by a network device, such as a gNB.
  • a second mode also referred to as NR V2X mode 2 or mode 2 hereinafter
  • terminal devices may perform V2X communications with each other by using resources autonomously selected in a preconfigured resource pool. Since V2X communications are often closely related to road traffic safety and personal security, there is a demand on an enhanced reliability, improved resource coordination and a reduced delay for sidelink communications.
  • example embodiments of the present disclosure provide a solution of selecting resources for the transmission of sidelink communication.
  • a method for communications comprises in accordance with a determination that a sidelink transmission is to be transmitted from a terminal device in an autonomous selection mode, determining, at the terminal device, a resource selection scheme for the sidelink transmission; determining, from a resource pool configured for the terminal device, a set of candidate resources associated with the sidelink transmission based on the resource selection scheme; and selecting, from the set of candidate resources, at least one target resource for the sidelink transmission.
  • a terminal device comprising a processor and a memory storing instructions.
  • the memory and the instructions are configured, with the processor, to cause the terminal device to perform the method according to the first aspect.
  • a computer readable medium having instructions stored thereon.
  • the instructions when executed on at least one processor of a device, cause the device to perform the method according to the first aspect.
  • Figs. 1A to 1C show schematic diagrams of the sensing, partial sensing and random selection for resources performed by a terminal device in the LTE system.
  • Fig. 2 is a schematic diagram of a communication environment in which some embodiments of the present disclosure can be implemented
  • Fig. 3 illustrates a flowchart of an example method in accordance with some embodiments of the present disclosure
  • Fig. 4 illustrates a schematic diagram of reporting the candidate resources in the resource selection scheme related to the random selection mechanism in accordance with some embodiments of the present disclosure
  • Fig. 5 illustrates a schematic diagram of selecting target resources in the resource selection scheme related to the random selection mechanism in accordance with some embodiments of the present disclosure
  • Fig. 6 illustrates a schematic diagram of an additional sensing in the resource selection scheme related to the sensing mechanism in accordance with some embodiments of the present disclosure.
  • Fig. 7 is a simplified block diagram of a device that is suitable for implementing some embodiments of the present disclosure.
  • terminal device refers to any device having wireless or wired communication capabilities.
  • the terminal device include, but not limited to, user equipment (UE) , personal computers, desktops, mobile phones, cellular phones, smart phones, personal digital assistants (PDAs) , portable computers, tablets, wearable devices, internet of things (IoT) devices, Internet of Everything (IoE) devices, machine type communication (MTC) devices, device on vehicle for V2X communication where X means pedestrian, vehicle, or infrastructure/network, or image capture devices such as digital cameras, gaming devices, music storage and playback appliances, or Internet appliances enabling wireless or wired Internet access and browsing and the like.
  • UE user equipment
  • PDAs personal digital assistants
  • IoT internet of things
  • IoE Internet of Everything
  • MTC machine type communication
  • X means pedestrian, vehicle, or infrastructure/network
  • image capture devices such as digital cameras, gaming devices, music storage and playback appliances, or Internet appliances enabling wireless or wired Internet access and browsing and the like.
  • the term ‘network device’ or ‘base station’ (BS) refers to a device which is capable of providing or hosting a cell or coverage where terminal devices can communicate.
  • a network device include, but not limited to, a Node B (NodeB or NB) , an Evolved NodeB (eNodeB or eNB) , a next generation NodeB (gNB) , a Transmission Reception Point (TRP) , a Remote Radio Unit (RRU) , a radio head (RH) , a remote radio head (RRH) , a low power node such as a femto node, a pico node, and the like.
  • NodeB Node B
  • eNodeB or eNB Evolved NodeB
  • gNB next generation NodeB
  • TRP Transmission Reception Point
  • RRU Remote Radio Unit
  • RH radio head
  • RRH remote radio head
  • a low power node such as a fem
  • the term “resource, ” “transmission resource, ” “resource block, ” “physical resource block, ” “uplink resource, ” or “downlink resource” may refer to any resource for performing a communication, for example, a communication between terminal devices or a terminal device and a network device, such as a resource in time domain, a resource in frequency domain, a resource in space domain, a resource in code domain, or any other resource enabling a communication, and the like.
  • a resource in both frequency domain and time domain will be used as an example of a transmission resource for describing some embodiments of the present disclosure. It is noted that embodiments of the present disclosure are equally applicable to other resources in other domains.
  • the terms “sensing” and “full sensing” refer to a sensing mechanism that a terminal device performs sensing on a selected resource pool during a predefined sensing window to obtain sidelink control information (SCI) and measures reference signal received power (RSRP) from other terminal devices. Based on a result of sensing, the terminal device determines a set of candidate resources in a predefined selection window.
  • SCI sidelink control information
  • RSRP reference signal received power
  • partial sensing refers to a sensing mechanism that a terminal device performs sensing on a part of a predefined sensing window to obtain SCI and measures RSPR from other terminal devices.
  • the terminal device determines a set of candidate resources in a part of predefined selection window based on a result of partial sensing.
  • first As used herein, the terms “first” , “second” and the like may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments. As used herein, the term “and/or” includes any and all combinations of one or more of the listed terms.
  • values, procedures, or apparatus are referred to as “best, ” “lowest, ” “highest, ” “minimum, ” “maximum, ” or the like. It will be appreciated that such descriptions are intended to indicate that a selection among many used functional alternatives can be made, and such selections need not be better, smaller, higher, or otherwise preferable to other selections.
  • terminal devices in autonomous resource selection mode may perform V2X communications with each other by using resources autonomously selected from a sidelink resource pool.
  • the sidelink resource pool may be configured or preconfigured by high layer RRC parameters or PSBCH.
  • the sidelink resource pool mainly supports three resource selection manners, namely, the sensing, partial sensing and the random selection.
  • the terminal device may sense the sidelink channel during a predefined sensing window to obtain SCI and measures reference signal received power (RSRP) from other terminal devices to determine a set of candidate resource in a predefined selection window.
  • RSRP reference signal received power
  • the terminal device considers all the resources in the predefined selection window as to be available for the sidelink transmission.
  • FIGs. 1A to 1C show schematic diagrams of the sensing, partial sensing and random selection for resources performed by a terminal device in mode 4 in the LTE system.
  • the higher layer for example, the MAC layer of the terminal device triggers the resource (re-) selection at time t 0 .
  • the lower layer for example, the physical layer of the terminal device senses the sidelink channel during a predefined sensing window (that is before a selection window 101, not shown in Fig. 1) to determine the availability of all the slots included in the predefined selection window 101.
  • the terminal device determines, based on the result of sensing, resources represented by grip pattern are reserved by other terminal devices, while resources represented by stripe pattern are available for the sidelink transmission and thus may be regarded as the set of candidate resources.
  • the terminal device only senses a part of subframes in the sensing window and determines for a part of subframes in the selection window 102 and determines a set of candidate resources which are represented by stripe pattern among those subframes.
  • the terminal device considers all of the resources in the selection window 103 as the set of candidate resource.
  • the lower layer of the terminal device may then report the set of candidate resources to its higher layers.
  • the resource pool indicates the allowed resource selection manners to be performed by terminal devices by a resourceSelectionConfigP2X parameter.
  • the terminal device determines that the sensing is allowed for the sidelink resource pool.
  • the terminal device determines that both of the partial sensing and random selection are supported by the sidelink resource pool, and either of them can be selected.
  • the terminal device which performs random selection is allowed to reserve the resources for multiple transport blocks (TB) in a semi-persistent resource reservation manner.
  • the terminal device may reserve resources for its periodic TBs via a reservation signaling. The reservation of the resources can be sensed during the partial sensing performed by other terminal devices in proximity to the terminal device.
  • the terminal device determines that only one of the partial sensing and random selection is supported by the sidelink resource pool. Specifically, if the sidelink resource pool only supports the random selection, instead of reserving resources for multiple TBs in the semi-persistent resource reservation manner, the terminal devices have to select resources for every TB.
  • the aperiodic traffic supported by NR V2X communications may challenge the conventional resource selection mechanism.
  • the random resource selection for aperiodic traffic without reservation signaling may lead more resource collisions and interferences to partial sensing or sensing pperformed by other terminal devices.
  • For LTE V2X communications only 2 (re-) transmissions for one TB is supported, while for NR V2X communications, the number of (re-) transmissions for one TB is up to 32. This potentially increases the probability of resource collisions between different terminal devices performing random selection on the same resource pool.
  • the conventional resource selection mechanism may not be suitable for the sidelink communications in NR V2X.
  • Embodiments of the present disclosure provide a solution for resource selection in V2X communications, so as to solve the above problems and one or more of other potential problems.
  • the terminal devices may flexibly adjust the resource selection scheme based on one or more of configurations and conditions of the resource pool, occupancies of the resources, the priority of the sidelink transmission and so on.
  • the embodiments of the present disclosure propose a solution for supporting the reservation of resources for aperiodic traffics. As such, the resource collisions between multiple terminal devices configured with the same resource pool are greatly reduced, and the requirements on reliability, power consumption and delay of V2X communications can be met.
  • Fig. 2 is a schematic diagram of a communication environment 200 in which some embodiments of the present disclosure can be implemented.
  • the communication network 200 may include terminal devices 210, 220 and 230. It should be understood that the communication network 200 may further include a network device (not shown) .
  • the network device may communicate with the terminal devices 210, 220 and 230 via respective wireless communication channels.
  • the terminal devices 210, 220 and 230 are operating in V2X mode 2, and configured with the same resource pool 240. It is to be understood that the number of devices in Fig. 2 is given for the purpose of illustration without suggesting any limitations to the present disclosure.
  • the communication network 200 may include any suitable number of network devices and/or terminal devices adapted for implementing implementations of the present disclosure.
  • the resource pool 240 may support either random selection or partial sensing, or both of them.
  • the resource selection supported by the resource pool 240 may be indicated by a higher layer configuration parameter, for example, resourceSelectionConfigNR.
  • the parameter resourceSelectionConfigNR may contain one or more indicators corresponding to respective resource selection, for example, a first indicator partialSensing indicative of the resource pool 240 supporting the partial sensing, the second indicator randomSelection indicative of the resource pool 240 supporting the random selection, and a third indicator Sensing indicative of the resource pool 240 supporting the sensing.
  • the terminal devices 210, 220 and 230 Upon receiving the configuration parameter resourceSelectionConfigNR from the higher layer, the terminal devices 210, 220 and 230 determines a resource selection to be performed.
  • the terminal devices 210, 220 and 230 may receive the configuration parameter resourceSelectionConfigNR ⁇ Sensing, partialSensing, randomSelection ⁇ , with the terminal devices 210 and 220 determining to perform random selection and the terminal device 230 determining to perform the partial sensing.
  • the resource pool 240 supports more than one resource selection mechanisms, namely, the sensing, partial sensing and random selection, for the terminal device 230 which determines to perform the partial sensing, additional sensing may be performed, which will be described in details below.
  • the terminal device 210 may determine the resource pool based on the indicator included in the resource selection configuration.
  • the configuration parameter resourceSelectionConfigNR only contains a single indicator corresponding to the resource selection mechanism supported by the resource pool.
  • the configuration parameter resourceSelectionConfigNR ⁇ partialSensing ⁇ is configured form higher layer of the terminal device 230. In selecting resources for the sidelink transmission, the terminal device 230 performs partial sensing on the sidelink channel, and selects resources in a resource pool specific to the partial sensing mechanism. Then, the terminal device 230 transmits the SCI and the sidelink transmissions based on the partial sensing mechanism.
  • the configuration parameter resourceSelectionConfigNR ⁇ randomSelection ⁇ is configured from high layer of the terminal device 220.
  • the terminal device 220 selects resources in a resource pool specific to the random selection mechanism, transmits the SCI and the sidelink transmission based on the random selection mechanism.
  • the higher layer such as the MAC layer
  • the higher layer may trigger the selection of resources for their own sidelink transmission, and deliver the sidelink configuration parameters to the physical layer.
  • the physical layer may determine a target resource selection mechanism and then a resource selection scheme related to the determined target resource selection manner.
  • a set of candidate resources is determined based on a result of sensing and returned to the higher layer.
  • a set of candidate resources is randomly selected from the selection window.
  • the communications in the communication network 100 may conform to any suitable standards including, but not limited to, Global System for Mobile Communications (GSM) , Long Term Evolution (LTE) , LTE-Evolution, LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , Code Division Multiple Access (CDMA) , GSM EDGE Radio Access Network (GERAN) , Machine Type Communication (MTC) and the like.
  • GSM Global System for Mobile Communications
  • LTE Long Term Evolution
  • LTE-Evolution LTE-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • GERAN GSM EDGE Radio Access Network
  • MTC Machine Type Communication
  • the communications may be performed according to any generation communication protocols either currently known or to be developed in the future.
  • Examples of the communication protocols include, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) communication protocols.
  • Fig. 3 illustrates a flowchart of an example method in accordance with some embodiments of the present disclosure.
  • the method 300 can be implemented at a terminal device, such as any of the terminal devices 210 to 230 as shown in Fig. 2. Additionally, or alternatively, the method 300 can also be implemented at other terminal devices not shown in Fig. 2. For the purpose of discussion, the method 300 will be described with reference to Fig. 2 as performed by the terminal device 210 without loss of generality.
  • the terminal device 210 determines a sidelink transmission is to be transmitted on the sidelink channel.
  • the higher layer such as the MAC layer
  • the terminal device 210 may trigger the selection of resources for the sidelink transmission at a point of time T 0 .
  • the lower layer such as the physical layer of the terminal device 210, upon reception of the trigger, determines a resource selection scheme for the sidelink transmission.
  • the terminal device 210 may determine a resource selection mechanism to be performed based on the resource selection configuration, for example, resourceSelectionConfigNR.
  • the resource selection configuration may include at least one of the first indicator indicating the sensing mechanism, the second indicator indicating the partial sensing mechanism and the third indicator indicating a random selection mechanism.
  • the terminal device 210 may determine to perform whether the partial sensing or the random selection based on one or more selection conditions. For example, upon receiving the trigger from the higher layer at time T 0 , the terminal device 210 may select resources in the preconfigured selection window. The terminal device 210 initially determines to perform partial sensing in selecting the resource for the sidelink transmission.
  • resourceSelectionConfigNR partialSensing, randomSelection ⁇
  • the terminal device 210 only selects the resources in part of the slots in the selection window, in a case the slots number within a predetermined period, such as [T 0 +T 1 , T 0 +T 2 ] is less than a predetermined minimum slot number, the terminal device 210 stops excluding resources and considers all the slots within the [T 0 +T 1 , T 0 +T 2 ] as the set of candidate resources, where T 1 and T 2 are the boundary timing of the resource selection window. In this case, the terminal device 210 switches from the partial sensing to the random selection.
  • a predetermined period such as [T 0 +T 1 , T 0 +T 2 ] is less than a predetermined minimum slot number
  • the terminal device 210 may determine the resource selection mechanism by determining whether the priority of the sidelink transmission exceeds a threshold priority. For example, if the priority value of MAC PDU does not exceed a preconfigured threshold priority value P 0 , such as any value of 1, 2, 3, 4, 5, 6, 7, 8 from the higher layer, the terminal device 210 may determine to perform the partial sensing, and thus the resource selection scheme is related to the partial sensing mechanism. If the priority value of MAC PDU exceeds the threshold priority, the terminal device 210 may determine to perform the random selection.
  • a threshold priority such as any value of 1, 2, 3, 4, 5, 6, 7, 8
  • the terminal device 210 may determine the resource selection mechanism by determining whether the channel busy ratio (CBR) of the resource pool exceeds a threshold ratio R 0 preconfigured by a higher layer, ranging from [0, 1] . For example, if the terminal device 210 determines that the CBR of the resource pool exceeds the threshold ratio R 0 , the partial sensing mechanism is determined for selecting resources for the sidelink transmission. If the CBR of the resource pool does not exceed the threshold ratio R 0 , the terminal device 210 may determine to perform the random selection and thus the resource selection scheme is related to the random selection mechanism.
  • CBR channel busy ratio
  • the terminal device 210 determines, from the resource pool 240, a set of candidate resources associated with the sidelink transmission based on the resource selection scheme.
  • the physical layer of the terminal device 210 may report a set of candidate resources based on the result of sensing to the higher layer of the terminal device 210.
  • Fig. 4 shows a schematic diagram for reporting the candidate resources in the resource selection scheme related to the random selection mechanism in accordance with some embodiments of the present disclosure.
  • the reporting of the candidate resources as shown in Fig. 4 will be described with reference to Fig. 2 as performed by the terminal devices 210, 220 and 230 without loss of generality.
  • all the resources included in the selection window 401 are considered as the set of candidate resources.
  • the physical layer of the terminal device 220 may further report part of the resources within the selection window 401 as the set of candidate resources.
  • the physical layer of terminal device 220 divides resources in the resource pool into N subsets of resources, each of the sets corresponding to one of a plurality of priorities of sidelink transmissions, for example, layer 1 priority.
  • the slots within the selection window 401 may not be divided equally.
  • the last remaining orphan slots including fewer slots than the former subsets may be the N-th subset or the first subset. In some other embodiments, the last remaining orphan slots including fewer slots than the former subsets may be incorporated in the N-th subset or the first subset.
  • the physical layer of the terminal device 220 performing the random selection with layer-1 priority value P may report the last or the first subsets of resources within the selection window 401 to the higher layer.
  • the physical layer of the terminal device 220 performing random selection with layer-1 priority value P may report any of the selected subsets of the resources within the selection window 401 to its higher layer.
  • the physical layer of the terminal device 220 may determine a corresponding subset of the resources and select the subset of resources to be the set of candidate resources for the sidelink transmission.
  • the terminal device 210 selects, from the set of candidate resources, at least one target resource for the sidelink transmission.
  • the higher layer of the terminal device 210 selects at least one target resource from the set of candidate resources based on one or more selection scheme, which will be discussed in details in connection with Figs. 5 and 6.
  • the physical layer of the terminal device 230 may report all of the resources within the selection window to its higher layer as the set of candidate resources. In this case, the higher layer may select the target resources based on priority value N of the sidelink transmission.
  • Fig. 5 illustrates a schematic diagram of selecting target resources in the resource selection scheme related to the random selection mechanism in accordance with some embodiments of the present disclosure.
  • the selection of the target resources as shown in Fig. 5 will be described with reference to Fig. 2 as performed by the terminal devices 210, 220 and 230 without loss of generality.
  • the slots within the selection window 501 are divided into N subsets of resources, each corresponding to a respective priority value 1 to N.
  • the priory N may be configured by the higher layer of the terminal device 210.
  • the last remaining orphan slots may be the first or the N-th subset of resources. Alternatively, the last remaining orphan slots may be included in the first or the N-th subset of resource.
  • the terminal device 210 may obtain resource selection information predefined for the terminal device 210.
  • the resource selection information indicates possibilities for the plurality of subsets of resources selected for the target resources.
  • Table 1 shows an example of the resource selection information.
  • N is configured with 8 as an example.
  • Each of the subsets of candidate resources is allocated with a corresponding possibility. For example, the higher priority the sidelink transmission has, the greater the possibility is allocated to the N-th subset.
  • Table 2 shows another example of the resource selection information. As shown in Table. 2, for example, the possibility of selecting the same candidate resource as the target resource is varying from the sidelink transmissions with different priorities.
  • the higher layer of the terminal device 210 may perform additional sensing on the resource pool 240.
  • Fig. 6 illustrates a schematic diagram of an additional sensing in the resource selection scheme related to the sensing mechanism in accordance with some embodiments of the present disclosure.
  • the additional sensing mechanism as shown in Fig. 6 will be described with reference to Fig. 2 as performed by the terminal devices 210, 220 and 230 without loss of generality.
  • terminal device 210 selects, at the point of time T 0 , the resource to be the target resource to be used at a point of time M. Since the resource pool 240 supports both the random selection and partial sensing mechanisms, there are further terminal device, for example terminal devices 220 and 230 perform the random selection and some of the resource might be preempted by those terminal devices 220 and 230.
  • the terminal device 210 performs additional sensing on the resource pool 240 during a preconfigured period [M-T 3 , M-T 4 ] that is before time M.
  • the preconfigured period is associated with a processing time for decoding SCI and RSRP measurement, where T 3 represents a predefined time resources associated with the resource pool, for example, 32 sidelink slots or 100 ms, and T 4 represents the processing time of the terminal device 210 related to decoding SCI from other terminal devices and RSRP measurement.
  • the terminal device 210 may decode SCI from any other terminal device and measure the RSRP during the preconfigured period [M-T 3 , M-T 4 ] to determine whether the target resource is preempted. If a priority of another terminal device derived from the SCI is higher than that of terminal device 210 and/or higher than a preconfigured priority threshold P 1 and the RSRP exceeds a predetermined threshold of RSRP, the terminal device 210 may consider the target resource at the point of time M is preempted by another terminal device. In this case, the terminal device 210 may perform resource reselection.
  • the feature of performing the additional sensing may be defined on a per-resource pool basis, and such a feature may be enabled or disabled by the RRC parameters AdditionalSensingenabled and AdditionalSensingdisabled configured from the higher layer. In some other embodiments, only the RRC parameter AdditionalSensingenabled is used for enabling the terminal device 210 to perform the additional sensing. In absence of the RRC parameter AdditionalSensingenabled, the terminal device 210 does not perform the additional sensing by default.
  • the additional sensing mechanism may be enabled or disabled based on the CBR of the resource pool 240.
  • the CBR of the resource pool 240 may be any value ranging from [0, 1] . Specifically, in a case where the CBR of the resource pool 240 is below a predetermined threshold CBR, the additional sensing mechanism is disabled. Otherwise, in a case where the CBR of the resource pool 240 exceeds a predetermined threshold CBR, the additional sensing mechanism is enabled.
  • the terminal device 220 determines to perform the random selection in selecting the resource for the sidelink transmission, and thus the resource selection scheme is related to random selection mechanism.
  • the retransmission number for the terminal device 210 may be up to 32, which potentially improves the resource collisions.
  • the terminal device 210 may determine the resource selection scheme by restricting the retransmission number, for example, with a higher layer configuration parameter sl-MaxTxTransNumPSSCH indicated in sl-PowerSavingPSSCH-TxConfigList.
  • the MaxTxTransNumPSSCH may be configured to be any of value ranges [1, 2] , [1, 4] , [1, 8] and [1, 16] , wherein the maximum retransmission number is an integer.
  • the terminal device 210 may select the number of HARQ retransmissions from the allowed numbers that are configured by RRC in sl-MaxTxTransNumPSSCH included in sl-PSSCH-TxConfigList. If configured by upper layers, overlapped in sl-MaxTxTransNumPSSCH indicated in sl-PowerSavsing-PSSCH-TxConfigList, and, if configured by upper layers, overlapped in sl-MaxTxTransNumPSSCH indicated in sl-CBR-PSSCH-TxConfigList for the highest priority of one or more logical channel allowed on the carrier and the CBR measured by lower layers if CBR measurement results are available or the corresponding sl-defaultTxConfigIndex configured by RRC if CBR measurement results are not available.
  • the terminal device 220 may determine the resource selection scheme by setting the number of the HARQ retransmission as one of the values of ⁇ 0, 1, 2, 4 ⁇ .
  • the retransmission number is preferably determined to be 2.
  • the multiple resource reservation may be enabled or disabled based on at least one configuration parameter of the resource pool 240.
  • the terminal device 220 may determine that the multiple resource reservation is not supported by the resource pool 240.
  • the terminal device 220 may be required to reselect the target resources for every TB.
  • the terminal device 220 may be required to reselect the target resources for every TB.
  • the configuration parameter sl-MultiReserveResource is configured with ⁇ enable ⁇ and the configuration parameter sl-ResourceReservePeriod is absent or contains only 0 ms of the resource pool 240, the terminal device 220 may not reserve resources for its subsequent transmissions.
  • resource pool 240 supports the multiple resource reservation, for example, the configuration parameter sl-MultiReserveResource is configured with ⁇ enable ⁇ , while resource pool 240 only supports the random selection mechanism, the terminal device 220 may be required to reselect the target resources for every TB.
  • the resource pool 240 support multiple resource reservation, for example, the configuration parameter sl-MultiReserveResource is configured with ⁇ enable ⁇ , and at least one of the partial sensing and the sensing is allowed by the resource pool 240, the terminal device 220 may reserve at least one of the target resources based on the semi-persistent resource reservation manner.
  • the terminal device 220 may reserve at least one of the target resources based on the semi-persistent resource reservation manner.
  • the lower layer of the terminal device 220 is configured to transmit the SCI and the sidelink transmission based on random selection mechanism by using the selected resource pool 240.
  • the lower layer of the terminal device 220 is indicated that transmissions of multiple MAC PDUs are allowed.
  • the terminal device 210 may determine the resource selection scheme for the next sidelink transmission based on the current resource selection mechanism.
  • the terminal device 210 may determine a number of the RSRP threshold being increased. Specifically, in selecting target resources for transmitting the sidelink transmission, if a number of the target resources is less than a preconfigured minimum number of resources, for example, 20%of the total candidate resources, the terminal device 210 may increase the RSRP threshold and repeat the partial sensing mechanism.
  • terminal device 210 increases the RSRP threshold and performs the sensing again until the number of the target resources is more than the preconfigured minimum number of resources. If the number of RSRP threshold being incremented exceeds a preconfigured number during sensing for a single MAC PDU, this may have negative impacts, for example, increasing the power consumption of the terminal device 210. In this case, the terminal device 210 determines that the resource selection scheme for the next sidelink transmission is related to the random selection mechanism to save power.
  • the terminal device 210 determines that a number of the target resources for transmitting the sidelink transmission exceeds a preconfigured ratio of the total candidate resources, for example, 50%, 65%or 80%.
  • the terminal device 210 may determine there are sufficient resources available for the sidelink transmission and the sensing procedure might not be necessary. In this case, the terminal device 210 may determine that the resource selection scheme for a next sidelink transmission is related to a random selection mechanism to save power.
  • Fig. 7 is a simplified block diagram of a device 700 that is suitable for implementing some embodiments of the present disclosure.
  • the device 700 can be considered as a further example embodiment of the terminal devices 210, 220 and 230 as shown in Fig. 2. Accordingly, the device 700 can be implemented at or as at least a part of the terminal devices 210, 220 and 230.
  • the device 700 includes a processor 710, a memory 720 coupled to the processor 710, a suitable transmitter (TX) and receiver (RX) 740 coupled to the processor 710, and a communication interface coupled to the TX/RX 740.
  • the memory 720 stores at least a part of a program 730.
  • the TX/RX 740 is for bidirectional communications.
  • the TX/RX 740 has at least one antenna to facilitate communication, though in practice an Access Node mentioned in this application may have several ones.
  • the communication interface may represent any interface that is necessary for communication with other network elements, such as X2 interface for bidirectional communications between gNBs or eNBs, S1 interface for communication between a Mobility Management Entity (MME) /Serving Gateway (S-GW) and the gNB or eNB, Un interface for communication between the gNB or eNB and a relay node (RN) , or Uu interface for communication between the gNB or eNB and a terminal device.
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • Un interface for communication between the gNB or eNB and a relay node (RN)
  • Uu interface for communication between the gNB or eNB and a terminal device.
  • the program 730 is assumed to include program instructions that, when executed by the associated processor 710, enable the device 700 to operate in accordance with the embodiments of the present disclosure, as discussed herein with reference to any of Figs. 2 to 6.
  • the embodiments herein may be implemented by computer software executable by the processor 710 of the device 700, or by hardware, or by a combination of software and hardware.
  • the processor 710 may be configured to implement various embodiments of the present disclosure.
  • a combination of the processor 710 and memory 720 may form processing means 750 adapted to implement various embodiments of the present disclosure.
  • the memory 720 may be of any type suitable to the local technical network and may be implemented using any suitable data storage technology, such as a non-transitory computer readable storage medium, semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory, as non-limiting examples. While only one memory 720 is shown in the device 700, there may be several physically distinct memory modules in the device 700.
  • the processor 710 may be of any type suitable to the local technical network, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples.
  • the device 700 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
  • the components included in the apparatuses and/or devices of the present disclosure may be implemented in various manners, including software, hardware, firmware, or any combination thereof.
  • one or more units may be implemented using software and/or firmware, for example, machine-executable instructions stored on the storage medium.
  • parts or all of the units in the apparatuses and/or devices may be implemented, at least in part, by one or more hardware logic components.
  • FPGAs Field-programmable Gate Arrays
  • ASICs Application-specific Integrated Circuits
  • ASSPs Application-specific Standard Products
  • SOCs System-on-a-chip systems
  • CPLDs Complex Programmable Logic Devices
  • various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representation, it will be appreciated that the blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • the present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium.
  • the computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the process or method as described above with reference to any of Figs. 3-6.
  • program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types.
  • the functionality of the program modules may be combined or split between program modules as desired in various embodiments.
  • Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
  • Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented.
  • the program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
  • the above program code may be embodied on a machine readable medium, which may be any tangible medium that may contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
  • the machine readable medium may be a machine readable signal medium or a machine readable storage medium.
  • a machine readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing.
  • machine readable storage medium More specific examples of the machine readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
  • RAM random access memory
  • ROM read-only memory
  • EPROM or Flash memory erasable programmable read-only memory
  • CD-ROM portable compact disc read-only memory
  • magnetic storage device or any suitable combination of the foregoing.

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

Abstract

La présente invention se rapporte, selon certains modes de réalisation, à un procédé de communication, à un dispositif terminal et à un support lisible par ordinateur. Le procédé de communication consiste, en fonction d'une détermination indiquant qu'une transmission de liaison latérale doit être transmise à partir d'un dispositif terminal dans un mode de sélection de ressource autonome, à déterminer, au niveau du dispositif terminal, un schéma de sélection de ressource pour la transmission de liaison latérale; à déterminer, à partir d'un groupe de ressources configuré pour le dispositif terminal, un ensemble de ressources candidates associées à la transmission de liaison latérale sur la base du schéma de sélection de ressource; et à sélectionner, à partir de l'ensemble de ressources candidates, au moins une ressource cible pour la transmission de liaison latérale. Des modes de réalisation de la présente invention concernent une solution pour la sélection de ressource de liaison latérale, et, de ce fait, évitent des collisions de ressources entre les dispositifs terminaux exécutant les mécanismes de sélection de ressource identiques ou différents, tout en améliorant la fiabilité de communications V2X.
PCT/CN2020/098338 2020-06-27 2020-06-27 Procédé de communication, dispositif terminal et support lisible par ordinateur WO2021258398A1 (fr)

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