WO2022006893A1 - Procédés de communications, dispositif terminal, et support lisible par ordinateur - Google Patents

Procédés de communications, dispositif terminal, et support lisible par ordinateur Download PDF

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Publication number
WO2022006893A1
WO2022006893A1 PCT/CN2020/101438 CN2020101438W WO2022006893A1 WO 2022006893 A1 WO2022006893 A1 WO 2022006893A1 CN 2020101438 W CN2020101438 W CN 2020101438W WO 2022006893 A1 WO2022006893 A1 WO 2022006893A1
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WIPO (PCT)
Prior art keywords
terminal device
predetermined number
selection window
resource
resource selection
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PCT/CN2020/101438
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English (en)
Inventor
Zhaobang MIAO
Gang Wang
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Nec Corporation
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Priority to PCT/CN2020/101438 priority Critical patent/WO2022006893A1/fr
Publication of WO2022006893A1 publication Critical patent/WO2022006893A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0006—Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal

Definitions

  • Embodiments of the present disclosure generally relate to the field of communication, and in particular, to a solution for partial sensing of sidelink channels.
  • 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.
  • a terminal device may perform V2X communications with another terminal device by using resources allocated by a network device.
  • a terminal device may perform V2X communications with another terminal device by using resources autonomously selected in a resource selection window by the terminal device.
  • a terminal device may select resources in the resource selection window by performing sensing of sidelink channels, partial sensing of the sidelink channels, or random selection of the resources.
  • the terminal device may select all the potential candidate resources in the resource selection window. Then, the terminal device may determine whether all the potential candidate resources are occupied by other terminal devices by performing sensing. In the case of partial sensing, the terminal device may select part of all the potential candidate resources in the resource selection window. In turn, the terminal device may determine whether the selected potential candidate resources are occupied by other terminal devices by performing partial sensing. In the case of random selection, the terminal device will not determine whether the potential candidate resources are occupied by other terminal devices by performing sensing or partial sensing. Instead, the terminal device may consider all the potential candidate resources may be used as candidate resources for a sidelink transmission. Enhancement for partial sensing for NR V2X needs to be studied.
  • example embodiments of the present disclosure provide a solution for partial sensing of sidelink channels.
  • a method for communications comprises obtaining, at a terminal device, the predetermined number of potential candidate resources in a resource selection window for a sidelink transmission.
  • the predetermined number is selected from a plurality of sets of values.
  • the plurality of sets of values are associated with different minimum sizes of the resource selection window.
  • the method also comprises selecting a first number of the potential candidate resources from the resource selection window for performing partial sensing of sidelink channels. The first number is above the predetermined number.
  • a method for communications comprises obtaining, at a terminal device, the predetermined number of potential candidate resources in a resource selection window for a sidelink transmission.
  • the predetermined number is associated with a parameter for determining an end of the resource selection window.
  • the parameter is dedicated for partial sensing of sidelink channels.
  • the method also comprises selecting a first number of the potential candidate resources from the resource selection window for performing the partial sensing. The first number is above the predetermined number.
  • a method for communications comprises determining, at a first terminal device, a second resource in a resource selection window based on a first resource in a sensing window and a resource reservation period for a second terminal device.
  • the method also comprises selecting, from the resource selection window, a resource as a candidate resource for a second sidelink transmission of the first terminal device by performing partial sensing of sidelink channels in the sensing window.
  • the candidate resource is different from the second resource.
  • 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 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 second aspect.
  • 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 third 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.
  • 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 second 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 third aspect.
  • Fig. 1 is a schematic diagram of a communication environment in which some embodiments of the present disclosure can be implemented
  • Fig. 2 illustrates a flowchart of an example method in accordance with some embodiments of the present disclosure
  • Fig. 3 illustrates a flowchart of another example method in accordance with some embodiments of the present disclosure
  • Fig. 4 illustrates a flowchart of yet another example method in accordance with some embodiments of the present disclosure
  • Fig. 5 illustrates an example of a periodic resource reservation in accordance with some embodiments of the present disclosure.
  • Fig. 6 is a simplified block diagram of a device that is suitable for implementing some embodiments of the present disclosure.
  • BS base station
  • BS refers to a device which is capable of providing or hosting a cell or coverage where terminal devices can perform communications.
  • 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) , an infrastructure device for a V2X communication, 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.
  • TRP Transmission/Reception Point
  • RRU Remote Radio Unit
  • RH radio head
  • RRH remote radio head
  • terminal device refers to any device having wireless or wired communication capabilities.
  • the terminal device include, but not limited to, user equipment (UE) , vehicle-mounted terminal devices, devices of pedestrians, roadside units, personal computers, desktops, mobile phones, cellular phones, smart phones, personal digital assistants (PDAs) , portable computers, 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
  • vehicle-mounted terminal devices devices of pedestrians, roadside units
  • PDAs personal digital assistants
  • portable computers portable computers
  • image capture devices such as digital cameras
  • gaming devices music storage and playback appliances
  • Internet appliances enabling wireless or wired Internet access and browsing and the like.
  • 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.
  • NR sidelink enhancement may include resource allocation enhancement to specify resource allocation to reduce power consumption of the UEs.
  • resource allocation enhancement to specify resource allocation to reduce power consumption of the UEs.
  • sidelink random resource selection and partial sensing to NR sidelink resource allocation mode 2 may be considered. It is noted that introducing a new solution to reduce power consumption for the cases where above methods cannot work properly.
  • the terminal device may select part of all the potential candidate resources in the resource selection window. In turn, the terminal device may determine whether the selected potential candidate resources are occupied by other terminal devices by performing partial sensing.
  • the terminal device shall determine by its implementation a set of subframes which consists of at least Y subframes within a time interval [n+T 1 , n+T 2 ] , where selections of T 1 and T 2 are up to implementations of the terminal device under T 1 ⁇ 4 and 20 ⁇ T 2 ⁇ 100.
  • the selection of T 2 shall fulfil the latency requirement and Y shall be greater than or equal to a higher layer parameter minNumCandidateSF.
  • the higher layer parameter minNumCandidateSF indicates the minimum number of subframes that are included in the possible candidate resources.
  • the higher layer parameter minNumCandidateSF is in the range [1, 13] . In other words, minNumcandidateSF is selected from a single set of values [1...13] .
  • the terminal device senses at least subframe n-100*k.
  • the set of k is configured or preconfigured with each element in the range [1, 10] .
  • the minimum size of the resource selection window has a single value, that is [n+4, n+20] , which contains 17 subframes.
  • Y subframes > minNumcandidateSF: : ⁇ 1...13 ⁇ according to the implementation of the terminal device.
  • the terminal device shall assume that any set of L subCH contiguous sub-channels included in the corresponding resource pool within the time interval [n+T 1 , n+T 2 ] correspond to one candidate single-slot resource.
  • the selection of T 1 is up to UE implementation under where depends on ⁇ and is defined in slots in Table 1, and ⁇ is the subcarrier spacing (SCS) configuration of the sidelink bandwidth part (BWP) for the terminal device.
  • SCS subcarrier spacing
  • T 2min is shorter than the remaining packet delay budget (RPDB, in slots)
  • T 2 is up to implementation of the terminal device subject to T 2min ⁇ T 2 ⁇ RPDB; otherwise T 2 is set to the RPDB (in slots) .
  • the mapping among ⁇ , T 1 , T 2min , and RPDB are shown in Table 2.
  • T 2min is set to the corresponding value from a higher layer parameter sl-SelectionWindow-r16.
  • the higher layer parameter sl-SelectionWindow-r16 may be any of n1, n5, n10 and n20.
  • the resource selection window [n+T 1 , n+T 2 ] may have different minimum sizes depending on ⁇ , T 2min , RPDB and implementation of the terminal device.
  • the resource selection window [n+T 1 , n+T 2 ] may have different minimum sizes and the resource selection window may contain only one slot, selecting the minNumcandidateSF from a single set of values is not suitable for the second conventional solution.
  • embodiments of the present disclosure provide a solution for determining potential candidate resources.
  • different minimum sizes of a resource selection window are associated with a plurality of sets of values.
  • the predetermined number of potential candidate resources in a resource selection window is selected from the plurality of sets of values.
  • a terminal device selects a first number of the potential candidate resources from the resource selection window for performing partial sensing of sidelink channels. The first number is above the predetermined number.
  • the reported sensing result may be inaccuracy due to “unknown” slots.
  • a monitoring slot associated with the slot n is m.
  • the terminal device may have not monitored slot m.
  • the terminal device can not receive sidelink control information (SCI) transmitted by other terminal devices in the slot m.
  • the terminal device can not determine whether the slot n is reserved by other terminal devices for their sidelink transmission.
  • the slot n may be referred to as an unknown slot.
  • the reported sensing result comprising the unknown slot may be inaccuracy.
  • the sidelink transmission of the terminal device will not be influenced by other terminal devices.
  • embodiments of the present disclosure provide a solution for determining candidate resources.
  • the terminal device if a terminal device has not monitor a first resource in a sensing window, the terminal device will exclude a second resource associated with the first resource from a resource selection window.
  • the terminal device selects, by performing partial sensing of sidelink channels in the sensing window, at least one resource from the resource selection window as at least one candidate resource for performing a sidelink transmission by the terminal device. In this way, the sensing result will not comprise any unknown slot and thus the sensing result will be accuracy.
  • Fig. 1 is a schematic diagram of a communication environment 100 in which some embodiments of the present disclosure can be implemented.
  • the communication environment 100 which may also be referred to as a communication network 100, includes a network device 110 serving a first terminal device 120 and a second terminal device 130.
  • the first terminal device 120 may communicate with the network device 110 via a communication channel 105
  • the second terminal device 130 may communicate with the network device 110 via a communication channel 115.
  • the communication channel 105 or 115 may be referred to as a downlink channel, whereas for transmissions from the first terminal device 120 or the second terminal device 130 to the network device 110, the communication channel 105 or 115.
  • the first terminal device 120 and the second terminal device 130 can also be referred to as the terminal device 120 and the terminal device 130 for simplicity.
  • the first terminal device 120 may communicate with the second terminal device 130 via a device-to-device (D2D) channel 135, which may also be referred to as a sidelink channel 135.
  • D2D device-to-device
  • the network device 110 may be absent in the communication environment 100.
  • one or more of the first terminal device 120, the second terminal device 130 and other terminal devices may be out of the coverage of the network device 110. In such cases, only sidelink communications exist between the first terminal device 120 and the second terminal device 130 as well as possibly other terminal devices not shown in Fig. 1.
  • the first terminal device 120 can perform a sidelink transmission to the second terminal device 130 using a set of transmission resources.
  • sidelink transmission generally refers to any transmission performed from one terminal device to another terminal device via a sidelink channel between them.
  • the sidelink transmission may be used for transmitting any data or control information associated with sidelink communications, for example, sidelink data or sidelink control information (SCI) or sidelink feedback information.
  • SCI sidelink data or sidelink control information
  • sidelink channel may generally refer to any channels for sidelink communications, for example, Physical Sidelink Shared Channel (PSSCH) , Physical Sidelink Control Channel (PSCCH) , Physical Sidelink Discovery Channel (PSDCH) , Physical Sidelink Broadcast Channel (PSBCH) , Physical Sidelink Feedback Channel (PSFCH) , and other existing or future sidelink channels.
  • PSSCH Physical Sidelink Shared Channel
  • PSCCH Physical Sidelink Control Channel
  • PSDCH Physical Sidelink Discovery Channel
  • PSBCH Physical Sidelink Broadcast Channel
  • PSFCH Physical Sidelink Feedback Channel
  • the term “resource, ” “transmission resource, ” or “sidelink resource” may refer to any resource for performing a communication, for example, a sidelink communication between terminal devices, such as a resource in time domain (for example, a time slot) , a resource in frequency domain (for example, a sub-channel) , 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 may be used as an example of a sidelink resource for describing some embodiments of the present disclosure.
  • embodiments of the present disclosure are equally applicable to any other resources in any other domains.
  • the network device 110, the first terminal device 120 and the second terminal device 130 are described in the communication environment 100 of Fig. 1, embodiments of the present disclosure may be equally applicable to any other suitable communication devices in communication with one another. That is, embodiments of the present disclosure are not limited to the example scenario of Fig. 1.
  • the first and second terminal devices 120 and 130 are schematically depicted as mobile phones in Fig. 1, it is understood that this depiction is only for example without suggesting any limitation.
  • the first and second terminal devices 120 and 130 may be any other wireless communication devices, for example, vehicle-mounted terminal devices.
  • V2X communications In the case where the first and second terminal devices 120 and 130 are vehicle-mounted terminal devices, the communications related to them may be referred to as V2X communications. More generally, although not shown in Fig. 1, a V2X communication related to the first and second terminal devices 120 and 130 may comprise a communication between the first or second terminal devices 120 or 130 and any other communication device, including but not limited to, an infrastructure device, another vehicle-mounted terminal device, a device of a pedestrian, a roadside unit, or the like. Furthermore, although not shown, all the communication links as shown in Fig. 1 may be via one or more relays.
  • the communication environment 100 may include any suitable number of terminal devices, any suitable number of network devices, and any suitable number of other communication devices adapted for implementing embodiments of the present disclosure.
  • the communications in the communication environment 100 may conform to any suitable standards including, but not limited to, Global System for Mobile Communications (GSM) , Extended Coverage Global System for Mobile Internet of Things (EC-GSM-IoT) , 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) , and the like.
  • GSM Global System for Mobile Communications
  • E-GSM-IoT Extended Coverage Global System for Mobile Internet of Things
  • LTE Long Term Evolution
  • LTE-Evolution LTE-Advanced
  • LTE-A LTE-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • GERAN GSM EDGE Radio Access Network
  • 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. 2 illustrates a flowchart of an example method 200 in accordance with some embodiments of the present disclosure.
  • the method 200 can be implemented at a terminal device, such as the first terminal device 120 as shown in Fig. 1. Additionally or alternatively, the method 200 can also be implemented at the second terminal device 130 or other terminal devices not shown in Fig. 1. For the purpose of discussion, the method 200 will be described with reference to Fig. 1 as performed by the terminal device 120 without loss of generality.
  • the terminal device 120 obtains the predetermined number of potential candidate resources in a resource selection window for a sidelink transmission.
  • the predetermined number is selected from a plurality of sets of values.
  • the plurality of sets of values are associated with different minimum sizes of the resource selection window.
  • a physical layer of the terminal device 120 may obtain the predetermined number from a higher layer of the terminal device 120.
  • the higher layer may include, but are not limited to a media access control (MAC) layer and radio resource control (RRC) layer.
  • MAC media access control
  • RRC radio resource control
  • the predetermined number of potential candidate resources may indicate the minimum number of the potential candidate resources. Because the minimum number is selected from the plurality of sets of values associated with different minimum sizes of the resource selection window, the proper minimum number of allowed candidate resources for NR V2X partial sensing can be configured.
  • each set of the values are determined based on at least one of the following: a SCS configuration for the terminal device 120, a parameter for determining an end of the resource selection window, or a RPDB for the sidelink transmission.
  • the parameter for determining an end of the resource selection window may be represented by the higher layer parameter sl-SelectionWindow-r16 or T 2min as described above.
  • ⁇ 0, 1, 2, 3 for SCS 15, 30, 60, 120KHz respectively.
  • the minimum size of the resource selection window will be 1, 3, 8, 18.
  • ⁇ 0, 1, 2, 3 for SCS 15, 30, 60, 120KHz respectively.
  • the plurality of sets of values may comprise ⁇ [1] , [1...N1] , [1...N2] , [1...N3] ⁇ where the values are determined with a reference SCS 15KHz.
  • the plurality of sets of values may comprise ⁇ [1...N1] , [1...N2] , [1...N3] ⁇ where the values are determined with the reference SCS 15KHz.
  • N1, N2 and N3 are described by way of example. Depending on a specific scenario, N1, N2 and N3 may take any other appropriate values.
  • the predetermined number is selected from a first set of the plurality of sets, and the first set is selected from the plurality of sets based on a priority of data to be transmitted by the terminal device 120.
  • the selection of the first set may depend on implementation of the terminal device 120.
  • one of the sets [1...N2*2 ⁇ ] and [1...N3*2 ⁇ ] may be selected as the first set.
  • the terminal device 120 may update the predetermined number with a product of the predetermined number and a predetermined value.
  • the predetermined value is associated with a SCS configuration for the terminal device 120. For example, the terminal device 120 may update the predetermined number based on the following:
  • minNumCandidateSl represents the predetermined number
  • the method according to the present disclosure may be feasible for different SCS.
  • the terminal device 120 may determine whether minNumCandidateSl is the same as a predetermined value (hereinafter also referred to as a first predetermined value) . If minNumCandidateSl is different from the first predetermined value, the terminal device 120 may update the predetermined number with the product.
  • the first predetermined value may be one. In other embodiments, the first predetermined value may be any appropriate value.
  • the terminal device 120 may obtain the predetermined number in association with the parameter for determining the end of the resource selection window.
  • the terminal device 120 may obtain the predetermined number minNumCandidateSl in association with the parameter sl-SlectionWindow-r16 via an RRC parameter SlectionWindowAndMinNumCandidateSl.
  • an example ASN. 1 for the parameter SlectionWindowAndMinNumCandidateSl may be as follows.
  • another example ASN. 1 for the parameter SlectionWindowAndMinNumCandidateSl may be as follows.
  • n1, n5, n10 and n20 may be 1, 5, 10, 20 based on a reference SCS (15 KHz) respectively. In other embodiments, n1, n5, n10 and n20 may take any appropriate value.
  • the terminal device 120 may determine whether sl-SlectionWindow-r16 is the same as a predetermined value (hereinafter also referred to as a second predetermined value) . If sl-SlectionWindow-r16 is different from the second predetermined value, the terminal device 120 may update the predetermined number with the product.
  • the second predetermined value may be n1. In other embodiments, the second predetermined value may be any appropriate value.
  • the terminal device 120 may determine whether minNumCandidateSl is the same as the first predetermined value. If minNumCandidateSl is different from the first predetermined value, the terminal device 120 may update the predetermined number with the product.
  • Fig. 3 illustrates a flowchart of an example method 300 in accordance with some embodiments of the present disclosure.
  • the method 300 can be implemented at a terminal device, such as the first terminal device 120 as shown in Fig. 1. Additionally or alternatively, the method 300 can also be implemented at the second terminal device 130 or other terminal devices not shown in Fig. 1. For the purpose of discussion, the method 300 will be described with reference to Fig. 1 as performed by the terminal device 120 without loss of generality.
  • the terminal device 120 obtains the predetermined number of potential candidate resources in a resource selection window for a sidelink transmission.
  • the predetermined number is associated with a parameter for determining an end of the resource selection window.
  • the parameter is dedicated for partial sensing of sidelink channels. That is, the parameter takes a fixed value for the partial sensing.
  • the predetermined number of potential candidate resources may indicate the minimum number of the potential candidate resources.
  • the parameter for determining an end of the resource selection window may be any of 20, 10 and 5.
  • T 2min the parameter*2 ⁇ .
  • the terminal device 120 selects a first number of the potential candidate resources from the resource selection window for performing the partial sensing.
  • the first number is above the predetermined number.
  • the parameter for determining an end of the resource selection window may be determined based on the reference SCS (15KHz) .
  • the terminal device 120 may update the predetermined number with a product of the predetermined number and a predetermined value.
  • the predetermined value is associated with a SCS configuration for the terminal device 120. For example, the terminal device 120 may update the predetermined number based on the above equation (1) .
  • the terminal device 120 may determine whether the predetermined number is the same as the first predetermined value. If the predetermined number is different from the first predetermined value, the terminal device 120 may update the predetermined number with the product.
  • Fig. 4 illustrates a flowchart of an example method 400 in accordance with some embodiments of the present disclosure.
  • the method 400 can be implemented at a terminal device, such as the first terminal device 120 as shown in Fig. 1. Additionally or alternatively, the method 400 can also be implemented at the second terminal device 130 or other terminal devices not shown in Fig. 1. For the purpose of discussion, the method 400 will be described with reference to Fig. 1 as performed by the first terminal device 120 without loss of generality.
  • the first terminal device 120 determines a second resource in a resource selection window based on a first resource in a sensing window and a resource reservation period for the second terminal device 130.
  • information on resource reservation period for the second terminal device 130 may be included in SCI transmitted from the second terminal device 130 in the first resource. If the first terminal device 120 is transmitting data in the first resource, the first terminal device 120 can not monitor the first resource to receive the SCI transmitted from the second terminal device 130. In this case, the first terminal device 120 determines the second resource in the resource selection window based on the first resource in a sensing window and an assumed resource reservation period for the second terminal device 130. In such embodiments, the second resource may be a resource that is assumed to be reserved by the second terminal device 130.
  • the first terminal device 120 may determine the timing of the second resource as a sum of the timing of the first resource and one or multiple resource reservation periods.
  • the resource reservation period may have a fixed value.
  • the resource reservation period may have any periodicity value allowed by a higher layer parameter reservationPeriodPartialSensing. For example, the terminal device 120 may determine the timing of the second resource based on the following:
  • n m + s*reservationPeriodPartialSensing (2)
  • n presents the timing of the second resource
  • m presents the timing of the first resource
  • s presents the number of the resource reservation period and s is a natural number.
  • the higher layer parameter reservationPeriodPartialSensing may be a subset of allowed reservation periods in the resource pool.
  • the subset may comprise ⁇ 50, 100, 200, 300, ..., 1000 ⁇ ms.
  • the resource reservation period may have any value of 50ms, 100ms, 200ms, 300ms and so on. This will be described in detail below with reference to Fig. 5.
  • Fig. 5 illustrates an example of a periodic resource reservation 500 in accordance with some embodiments of the present disclosure.
  • the first terminal device 120 is transmitting data in the first resource 511 in a sensing window 510.
  • the first terminal device 120 may determine that only the resource 521 in the resource selection window 520 is reserved by the second terminal device 130.
  • the first terminal device 120 selects, from the resource selection window, a resource as a candidate resource for a sidelink transmission of the first terminal device by performing partial sensing of sidelink channels in the sensing window.
  • the candidate resource is different from the second resource. For example, in the example as shown in Fig. 5, the candidate resource will be different from the resources 521 and 522 in the resource selection window 520.
  • the candidate resources for the sidelink transmission of the first terminal device will not comprise any unknown slot.
  • the sidelink transmission of the first terminal device will not be influenced by other terminal devices.
  • the physical layer of the first terminal device 120 may select a plurality of candidate resources for the sidelink transmission by performing the method 500. Upon selecting the plurality of candidate resources, the physical layer of the first terminal device 120 may report the selected candidate resources to the higher layer of the first terminal device 120.
  • the first terminal device 120 may exclude the second resource from the resource selection window.
  • the first terminal device 120 upon receiving a higher layer parameter indicating that the excluding is enabled for the first terminal device 120, the first terminal device 120 excludes the second resource from the resource selection window.
  • the first terminal device 120 before selecting a potential candidate resource from the resource selection window as a candidate resource, the first terminal device 120 excludes the second resource from the resource selection window.
  • the first terminal device 120 may select the first number of potential candidate resources from the resource selection window. The first number is above the predetermined number.
  • the first terminal device 120 may select the first number of potential candidate resources by performing any of the methods 200 and 300.
  • the selected potential candidate resources are different from the second resource. In other words, before selecting the first number of potential candidate resources, the first terminal device 120 excludes the second resource from the resource selection window.
  • the first terminal device 120 may determine a first subset of the first number of potential candidate resources by performing the partial sensing. In turn, the first terminal device 120 may select the resource from the first subset as the candidate resource.
  • the first terminal device 120 may exclude the second resource from a subset of resources that are sensing results. In such embodiments, the first terminal device 120 may select a second number of potential candidate resources from the resource selection window. The second number is above a second predetermined number. For example, the second number may be equal to the first number as described with reference to Figs. 2 and 3. Thus, the first terminal device 120 may select the second number of potential candidate resources by performing any of the methods 200 and 300.
  • the first terminal device 120 may determine a second subset of the second number of the resources by performing the partial sensing.
  • the second subset comprises the resources that are sensing results.
  • the first terminal device 120 may select the resource as the candidate resource from the second subset without the second resource. In other words, after excluding the second resource from the second subset, the first terminal device 120 selects the resource as the candidate resource from the second subset.
  • a total number of the potential candidate resources in the resource selection window may be below the predetermined number of potential candidate.
  • the total number of the potential candidate resources in the resource selection window may be less than the minimum number of potential candidate resources that will be selected. This will cause failure of selecting the first number of potential candidate from the resource selection window because the first number is above the predetermined number.
  • the first terminal device 120 may provide an indication of failure of the selecting to a higher layer. Upon receiving the indication, the higher layer may adjust and reconfigure the predetermined number.
  • the first terminal device 120 may choose not to perform partial sensing. For example, the first terminal device 120 may select all the potential candidate resources in the resource selection window to determine whether they are occupied by other terminal devices. Alternatively, the terminal device 120 will randomly select the resources from the resource selection window as candidate resources for the sidelink transmission.
  • Fig. 6 is a simplified block diagram of a device 600 that is suitable for implementing some embodiments of the present disclosure.
  • the device 600 can be considered as a further example embodiment of the first terminal device 120 and the second terminal device 130 as shown in Fig. 1. Accordingly, the device 600 can be implemented at or as at least a part of the first terminal device 120 and the second terminal device 130.
  • the device 600 includes a processor 610, a memory 620 coupled to the processor 610, a suitable transmitter (TX) and receiver (RX) 640 coupled to the processor 610, and a communication interface coupled to the TX/RX 640.
  • the memory 620 stores at least a part of a program 630.
  • the TX/RX 640 is for bidirectional communications.
  • the TX/RX 640 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 630 is assumed to include program instructions that, when executed by the associated processor 610, enable the device 600 to operate in accordance with the embodiments of the present disclosure, as discussed herein with reference to Figs. 2 to 4.
  • the embodiments herein may be implemented by computer software executable by the processor 610 of the device 600, or by hardware, or by a combination of software and hardware.
  • the processor 610 may be configured to implement various embodiments of the present disclosure.
  • a combination of the processor 610 and memory 620 may form processing means 650 adapted to implement various embodiments of the present disclosure.
  • the memory 620 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 620 is shown in the device 600, there may be several physically distinct memory modules in the device 600.
  • the processor 610 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 600 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. 12 to 14.
  • 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)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne, selon des modes de réalisation, une solution pour la détection partielle de canaux de liaison latérale. Un procédé de communications consiste à obtenir, au niveau d'un dispositif terminal, le nombre prédéterminé de ressources candidates potentielles dans une fenêtre de sélection de ressources pour une transmission de liaison latérale. Le nombre prédéterminé est choisi parmi une pluralité d'ensembles de valeurs. La pluralité d'ensembles de valeurs est associée à différentes tailles minimales de la fenêtre de sélection de ressources. Le procédé comprend également la sélection d'un premier nombre de ressources candidates potentielles à partir de la fenêtre de sélection de ressources pour effectuer une détection partielle de canaux de liaison latérale. Le premier nombre est supérieur au nombre prédéterminé.
PCT/CN2020/101438 2020-07-10 2020-07-10 Procédés de communications, dispositif terminal, et support lisible par ordinateur WO2022006893A1 (fr)

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