WO2021208087A1 - Procédé et appareil pour transmettre des canaux physiques de rétroaction de liaison latérale - Google Patents

Procédé et appareil pour transmettre des canaux physiques de rétroaction de liaison latérale Download PDF

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Publication number
WO2021208087A1
WO2021208087A1 PCT/CN2020/085407 CN2020085407W WO2021208087A1 WO 2021208087 A1 WO2021208087 A1 WO 2021208087A1 CN 2020085407 W CN2020085407 W CN 2020085407W WO 2021208087 A1 WO2021208087 A1 WO 2021208087A1
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Prior art keywords
psfchs
psfch
transmitting power
transmitting
remaining
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PCT/CN2020/085407
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English (en)
Inventor
Zhennian SUN
Xiaodong Yu
Haipeng Lei
Xin Guo
Haiming Wang
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Lenovo (Beijing) Limited
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Priority to PCT/CN2020/085407 priority Critical patent/WO2021208087A1/fr
Publication of WO2021208087A1 publication Critical patent/WO2021208087A1/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

Definitions

  • the subject application relates to sidelink communication, and more specifically relates to transmitting physical sidelink feedback channels (PSFCHs) during sidelink communication.
  • PSFCHs physical sidelink feedback channels
  • V2X Vehicle to everything
  • a direct link between two User Equipments (UEs) is called a sidelink (SL) .
  • Sidelink is a long-term evolution (LTE) feature introduced in 3GPP Release 12, and enables a direct communication between proximal UEs, and data does not need to go through a base station (BS) or a core network.
  • LTE long-term evolution
  • PSFCH selection is required before transmitting the PSFCHs.
  • One embodiment of the subject application provides a method for transmitting physical sidelink feedback channels (PSFCHs) , including: selecting a first set of PSFCHs from a second set of PSFCHs based on a priority value and a duplex scheme associated with each PSFCH in the second set of PSFCHs; and transmitting the first set of PSFCHs.
  • PSFCHs physical sidelink feedback channels
  • Another embodiment of the subject application provides an apparatus, including: a non-transitory computer-readable medium having stored thereon computer-executable instructions; a receiving circuitry; a transmitting circuitry; and a processor coupled to the non-transitory computer-readable medium, the receiving circuitry and the transmitting circuitry, wherein the computer-executable instructions cause the processor to implement the method for transmitting PSFCHs, including: selecting a first set of PSFCHs from a second set of PSFCHs based on a priority value and a duplex scheme associated with each PSFCH in the second set of PSFCHs; and transmitting the first set of PSFCHs.
  • Figure 1 illustrates a schematic diagram of a wireless communication system 100 in accordance with some embodiments of the subject disclosure.
  • Figure 2 illustrates an example of PSFCH resource collision according to some embodiments of the subject disclosure.
  • Figure 3 illustrates an example of two PSFCHs mapped to the same PRB according to some embodiments of the subject disclosure.
  • Figure 4 illustrates a solution for selecting PSFCHs based on the priority values and duplex schemes according to some embodiments of the subject application.
  • Figure 5 (a) illustrates a flow chart for selecting PSFCHs based on a priority value, duplex schemes, and the power requirements according to some embodiments of the subject application.
  • Figure 5 (b) illustrates another flow chart for selecting PSFCHs based on a priority value, duplex schemes, and the power requirements according to some embodiments of the subject application.
  • Figure 5 (c) illustrates an embodiment for selecting PSFCHs with different power spectral density (PSD) based on a priority value, duplex schemes, and the power requirements according to some embodiments of the subject application.
  • PSD power spectral density
  • Figure 5 (d) illustrates an embodiment for selecting PSFCHs with the same or similar PSD based on a priority value, duplex schemes, and the power requirements according to some embodiments of the subject application.
  • Figure 6 illustrates a method performed by a UE for transmitting physical sidelink feedback channel according to a preferred embodiment of the subject disclosure.
  • Figure 7 illustrates a block diagram of a UE according to the embodiments of the subject disclosure.
  • V2X UE under new radio (NR) V2X scenario may be referred to as V2X UE (s) .
  • a V2X UE which transmits data according to sidelink resource (s) scheduled by a base station (BS) , may be referred to as a UE for transmitting, a transmitting UE, a transmitting V2X UE, a Tx UE, a V2X Tx UE, a SL Tx UE, or the like.
  • a V2X UE which receives data according to sidelink resource (s) scheduled by a BS, may be referred to as a UE for receiving, a receiving UE, a receiving V2X UE, a Rx UE, a V2X Rx UE, a SL Rx UE, or the like.
  • V2X UE may include computing devices, such as desktop computers, laptop computers, personal digital assistants (PDAs) , tablet computers, smart televisions (e.g., televisions connected to the Internet) , set-top boxes, game consoles, security systems (including security cameras) , vehicle on-board computers, network devices (e.g., routers, switches, and modems) , internet of things (IoT) devices, or the like.
  • computing devices such as desktop computers, laptop computers, personal digital assistants (PDAs) , tablet computers, smart televisions (e.g., televisions connected to the Internet) , set-top boxes, game consoles, security systems (including security cameras) , vehicle on-board computers, network devices (e.g., routers, switches, and modems) , internet of things (IoT) devices, or the like.
  • V2X UE may include a portable wireless communication device, a smart phone, a cellular telephone, a flip phone, a device having a subscriber identity module, a personal computer, a selective call receiver, or any other device that is capable of sending and receiving communication signals on a wireless network.
  • V2X UE includes wearable devices, such as smart watches, fitness bands, optical head-mounted displays, or the like.
  • V2X UE (s) may be referred to as a subscriber unit, a mobile, a mobile station, a user, a terminal, a mobile terminal, a wireless terminal, a fixed terminal, a subscriber station, a user terminal, or a device, or described using other terminology used in the art.
  • V2X UE (s) may communicate directly with BS (s) via uplink (UL) communication signals.
  • a BS under NR V2X scenario may be referred to as a base unit, a base, an access point, an access terminal, a macro cell, a Node-B, an enhanced Node B (eNB) , a gNB, a Home Node-B, a relay node, a device, a remote unit, or by any other terminology used in the art.
  • a BS may be distributed over a geographic region.
  • a BS is a part of a radio access network that may include one or more controllers communicably coupled to one or more corresponding base stations.
  • a BS is generally communicably coupled to one or more packet core networks (PCN) , which may be coupled to other networks, like the packet data network (PDN) (e.g., the Internet) and public switched telephone networks, among other networks.
  • PCN packet core networks
  • PDN packet data network
  • MME mobility management entity
  • SGW serving gateway
  • PGW packet data network gateway
  • a BS may serve a number of V2X UEs within a serving area, for example, a cell or a cell sector via a wireless communication link.
  • a BS may communicate directly with one or more of V2X UEs via communication signals.
  • a BS may serve V2X UEs within a macro cell.
  • Sidelink communication between a Tx UE and an Rx UE under NR V2X scenario includes groupcast communication, unicast communication, or broadcast communication.
  • Embodiments of the present application may be provided in a network architecture that adopts various service scenarios, for example but is not limited to, 3GPP 3G, long-term evolution (LTE) , LTE-Advanced (LTE-A) , 3GPP 4G, 3GPP 5G NR (new radio) , 3GPP LTE Release 12 and onwards, etc. It is contemplated that along with the 3GPP and related communication technology development, the terminologies recited in the present application may change, which should not affect the principle of the present application.
  • LTE long-term evolution
  • LTE-A LTE-Advanced
  • 3GPP 4G 3GPP 4G
  • 3GPP 5G NR new radio
  • FIG. 1 illustrates an exemplary V2X communication system in accordance with some embodiments of the present application.
  • the V2X communication system includes a base station, i.e., BS 102 and some V2X UEs, i.e., UE 101-A, UE 101-B, and UE 101-C.
  • UE 101-A and UE 101-B are within the coverage of BS 102, and UE 101-C is not.
  • UE 101-A and UE 101-B may perform sidelink unicast transmission, sidelink groupcast transmission, or sidelink broadcast transmission.
  • a V2X communication system may include more or fewer BSs, and more or fewer V2X UEs.
  • V2X UEs which represent a Tx UE, a Rx UE, and etc.
  • names of V2X UEs may be different, e.g., UE 101c, UE 104f, and UE 108g or the like.
  • V2X UE as shown in Figure 1 is illustrated in the shape of a car, it is contemplated that a V2X communication system may include any type of UE (e.g., a roadmap device, a cell phone, a computer, a laptop, IoT (internet of things) device or other type of device) in accordance with some other embodiments of the present application.
  • UE e.g., a roadmap device, a cell phone, a computer, a laptop, IoT (internet of things) device or other type of device
  • UE 101-A functions as a Tx UE, and UE 101-B and UE 101-C function as an Rx UE.
  • UE 101-A may exchange V2X messages with UE 101-B, or UE 101-C through a sidelink, for example, PC5 interface as defined in 3GPP TS 23.303.
  • UE 101-A may transmit information or data to other UE (s) within the V2X communication system, through sidelink unicast, sidelink groupcast, or sidelink broadcast. For instance, UE 101-A transmits data to UE 101-B in a sidelink unicast session.
  • UE 101-A may transmit data to UE 101-B and UE 101-C in a groupcast group by a sidelink groupcast transmission session. Also, UE 102 may transmit data to UE 101-B and UE 101-C by a sidelink broadcast transmission session.
  • UE 101-B and 101-C functions a Tx UEs and transmit V2X messages
  • UE 101-A functions as a Rx UE and receives the V2X messages from UE 101-B and 101-C.
  • Both UE 101-A and UE 101-B in the embodiments of Figure 1 may transmit information to BS 102 and receive control information from BS 102, for example, via NR Uu interface.
  • BS 102 may define one or more cells, and each cell may have a coverage area. As shown in Figure 1, both UE 101-A and UE 101-B are within coverage of BS 102, and UE 101-C is outside of the coverage of BS 102.
  • BS 102 as illustrated and shown in Figure 1 is not a specific base station, but may be any base station (s) in the V2X communication system.
  • the V2X communication system includes two BSs 102
  • UE 101-A being within a coverage area of any one the two BSs 102 may be called as a case that UE 101-A is within a coverage of BS 102 in the V2X communication system; and only UE 101-A being outside of coverage area (s) of both BSs 102 can be called as a case that UE 101-A is outside of the coverage of BS 102 in the V2X communication system.
  • the PSFCH resources can be preconfigured or configured periodically with a period of 1 slot, 2 slots, or 4 slots.
  • a UE may receive multiple physical sidelink control channels (PSCCH) or physical sidelink shared channels (PSSCH) from different TX UEs, the UE may need to transmit multiple PSFCHs associated with received PSCCHs or PSSCHs.
  • PSCCH physical sidelink control channels
  • PSSCH physical sidelink shared channels
  • the UE may select some PSFCHs from a number of PSFCHs based on the associated priorities in received sidelink control information (SCI) , after selection, the UE may transmit the selected PSFCHs at the same time.
  • the PSFCH resources can be frequency division multiplexed or code division multiplexed. If some PSFCH resources among the selected PSFCH resources are code division multiplexed, then the UE cannot transmit these code division multiplexed PSFCHs simultaneously since some PSFCHs may be mapped to the same physical resource blocks (PRBs) .
  • PRBs physical resource blocks
  • the set of physical resource blocks (PRBs) for the candidate PSFCH resource is determined by the starting sub-channel and slot used for that PSSCH.
  • the set of PRBs for the candidate PSFCH resource is determined by sub-channel (s) and slot used for that PSSCH.
  • Figure 2 illustrates an example of PSFCH resource collision according to some embodiments of the subject disclosure.
  • both UE 201-B and UE 201-C transmit sidelink PSSCH to UE 201-A in slot n, and UE 201-A needs to transmit PSFCH to both UE 201-B and UE 201-C.
  • UE 201-C transmits a PSSCH to UE 201-A indicating PSFCH resources 2001, 2002, and 2003 in slot n;
  • UE 201-B transmits a PSSCH to UE 201-A indicating PSFCH resources 2002, and 2003 in slot n.
  • the set of PRBs for transmitting PSFCH for UE 201-C is determined by PSFCH resource 2001, PSFCH resource 2002, and PSFCH resource 2003 in slot n
  • the set of PRBs for transmitting PSFCH for UE 201-B is determined by PSFCH resource 2002 and PSFCH resource 2003 in slot n.
  • the PSFCH resource 2002 and PSFCH resource 2003 from different UE are overlapped.
  • the PSFCHs are determined by the sub-channels and slot, and there is a probability that the PSFCH for UE 201-B and the PSFCH for UE 201-C may be mapped to the same PRB.
  • a UE may simultaneously transmit a number of (hereinafter the number is represented with "N" ) PSFCHs.
  • N the number of PSFCHs.
  • the UE If a UE would transmit M PSFCHs in a PSFCH transmission occasion, the UE transmits min (M, N) PSFCHs corresponding to the smallest min (M, N) priority field values indicated in all SCI formats 0_1 associated with the PSFCH transmission occasion.
  • the UE can transmit the M PSFCHs without any problem.
  • CSPs cyclic shift pairs
  • Figure 3 illustrates an example of two PSFCHs mapped to the same PRB according to the above rule.
  • PSFCHs there are 6 PSFCHs, which are PSFCH 0 , PSFCH 1 , PSFCH 2 , PSFCH 3 , PSFCH 4 , and PSFCH 5 , and they are mapped to 4 PRBs, PRB 1 , PRB 2 , PRB 3 , and PRB 4 .
  • the UE may simultaneously transmit 4 PSFCHs.
  • M equals to 6
  • N equals to 4. Therefore, the UE transmits min (6, 4) PSFCHs corresponding to the smallest min (M, N) priority field values indicated in all SCI formats 0_1 associated with the PSFCH transmission occasion.
  • the priority value of PSFCH 0 is 6, the priority value of PSFCH 1 is 3, the priority value of PSFCH 2 is 0, the priority value of PSFCH 3 is 1, the priority value of PSFCH 4 is 0, and the priority value of PSFCH 5 is 5.
  • the UE may transmit min (6, 4) , which is 4 PSFCHs simultaneously, and the 4 PSFCHs are selected based on their priority values. Therefore, PSFCH 1 , PSFCH 2 , PSFCH 3 , and PSFCH 4 are selected. As can be seen, two PSFCHs, PSFCH 2 and PSFCH 3 , which are mapped to the same PRB, PRB 3 , are selected. The UE cannot transmit the two PSFCHs at the same time, and an error occurs.
  • the subject disclosure proposes to select the PSFCHs with additional requirements in addition to priority value.
  • Figure 4 illustrates a solution for selecting PSFCHs based on the priority values and duplex schemes according to some embodiments of the subject application.
  • P PRBs which are PRB 1 , PRB 2 , ..., PRB P
  • M PSFCHs which are PSFCH 0 , PSFCH 1 , PSFCH 2 , PSFCH 3 , PSFCH 4 , ..., and PSFCH M-1 .
  • P ⁇ M which means that there are more than one PSFCHs that are mapped to the same PRB.
  • PSFCH 2 and PSFCH 3 are both mapped to PRB 3
  • PSFCH 5 and PSFCH 6 are both mapped to PRB 5 .
  • the UE selects one PSFCH with the smallest priority filed values indicated in the SCI formats 0_1 associated with the PSFCH.
  • the PSFCH 2 is associated with a smaller priority value, which is 0, thus the UE selects PSFCH 2 , instead of PSFCH 3 , for PRB 3 .
  • the UE selects PSFCH 5 , instead of PSFCH 6 , for PRB 5 .
  • P PSFCHs are mapped to P PRBs, and the condition that two or more PSFCHs are mapped to the same PRB does not exist.
  • the UE may transmit N PSFCHs simultaneously; therefore, the UE selects min (P, N) PSFCHs based on the priority field values indicated in the SCI formats 0_1 associated with the PSFCH with an ascending order.
  • P is greater than N
  • the P PSFCHs needs to be further selected.
  • the UE can transmit 2 PSFCHs simultaneously, then two PSFCHs with the priority "0" , i.e., PSFCH 2 and PSFCH 5 , are selected. Therefore, in status 3 in Figure 4, there are 2 PSFCHs in 2 PRBs to be transmitted.
  • the technical solution in Figure 4 does not take the power control of PSFCH into consideration.
  • the power control for PSFCH based on sidelink path loss is configured or enabled.
  • the power control of PSFCH is only based on the path loss between the UE and the BS, in the subject disclosure, the power control of PSFCH is not only based on the path loss between the UE and the BS, but also based on the path loss between the sidelink UEs, and the PSFCHs are selected based on the path loss between the UE and the BS as well as the path loss between the sidelink UEs. Therefore, the selection of multiple PSFCHs for simultaneous transmission should also consider the transmitting power of the PSFCHs.
  • Figure 5 (a) illustrates a flow chart for selecting PSFCHs based on a priority value, duplex schemes, and the power requirements according to some embodiments of the subject application.
  • the UE first considers the priority of the PSFCH, specifically, the UE orders the M PSFCHs by their associated priority values by an ascending order.
  • the priority values of the PSFCHs are indicated in the SCI format 0_1 respectively.
  • the ordered PSFCHs will be referred to as PSFCH 0 , PSFCH 1 , PSFCH 2 , ..., PSFCH M-1 hereinafter.
  • the transmitting power of PSFCH is a function of one or two parameters, i) the path loss between the UE transmitting the PSFCH and the BS, and ii) the path loss between the UE transmitting the PSFCH and the UE to which the PSFCH is transmitted.
  • the transmitting power P 0 is based on the path loss between the UE which is transmitting PSFCH 0 and the BS; and the path loss between the UE transmitting PSFCH 0 and the UE receiving PSFCH 0 .
  • the UE sets the remaining power P remaining for transmitting the PSFCHs. Since no PSFCHs have been selected yet, P remaining equals to the maximum transmitting power of the UE, P max .
  • the UE also configures two counters, one is denoted with m, and is used to count the PSFCHs to be determined whether to be selected or not; the other is denoted with n, and is used to count the selected PSFCHs.
  • the UE would like to transmit M PSFCHs and it may select at most N PSFCHs for simultaneous transmission, thus the value of m ranges from 0 to M-1, and the value of n ranges from 0 to N-1.
  • step 503 when any one of m ⁇ M, n ⁇ N, and P remaining >0 is not met, the UE terminates the selection (step 508) .
  • step 504 the UE determines whether a PSFCH has been selected for the PRB of the current PSFCH, PSFCH m . If a PSFCH has been selected for the PRB of the current PSFCH, PSFCH m , it goes to step 505, otherwise, it goes to step 505.
  • the PSFCH may use frequency division multiplexing, or code division multiplexing which may cause collision at the same PRB. Step 504 can prevent the PSFCHs transmitted simultaneously are mapped to the same PRB.
  • step 505 the UE determines whether the transmitting power of the current PSFCH, PSFCH m , complied with the power requirement.
  • PSFCH m different power spectral density (PSD) of the simultaneously transmitted PSFCHs is allowed.
  • the UE considers whether the remaining power P remaining can satisfy the requirement on the coverage of the PSFCH m , i.e. whether the remaining power P remaining is greater than the transmitting power P m of the PSFCH m . If P m ⁇ P remaining , then PSFCH m is selected for transmission in the PRB of PSFCH m .
  • steps 501-508 is not limited to the above embodiments.
  • the step 504 may be moved following step 505.
  • the methods for selecting the PSFCHs of the present disclosure are not limited to the above embodiments.
  • Figure 5 (b) illustrates another flow chart for selecting PSFCHs based on a priority value, duplex schemes, and the power requirements according to some embodiments of the subject application.
  • the PSFCH m may not be selected continuously, thus the number 0, 1, ..., m may not be continuous numbers, for example, it may be 0, 1, 3, 6, ..., m.
  • step 503 the UE needs to determine whether the UE's maximum transmitting power is greater than or equal to the current occupied transmitting power plus the transmitting power of the current PSFCH m , that is, whether P occupied + P m ⁇ P max .
  • the method goes back to step 503, to determine whether the next PSFCH, PSFCH m+1 is be selected or not.
  • Figures 5 (c) illustrates an example for selecting PSFCHs based on Scenario 1.
  • the selection process first determines whether the remaining power is allowed to transmit the PSFCH 0 , i.e. whether the remaining power P remaining is greater than or equal to the transmitting power of P0. If P0 ⁇ P remaining , then PSFCH 0 is selected for transmission in the PRB of PSFCH 0 , and is added to a set of PSFCHs later to be transmitted at the same time. Since PSFCH 0 is selected, the remaining power for transmitting the PSFCHs P remaining becomes: P remaining -P 0 . The UE then moves on to the next PSFCH, PSFCH 1 , and determines whether the remaining power is allowed to transmit the PSFCH 1 , i.e. whether the remaining power P remaining is greater than the transmitting power of P 1 .
  • the PSFCH 0 is always selected, due to its highest priority.
  • the PSFCH 0 is selected only if the transmitting power of PSFCH 0 is equal to or smaller than the maximum transmitting power P max .
  • the simultaneously transmitted PSFCHs are required to have the same or similar PSD. That is, in step 505, the power requirement is that the transmitting power for PSFCH m not only has to be less than or equal to the remaining transmitting power of the UE, P remaining , but also has to be within a predetermined range of the transmitting power of the PSFCH with smallest priority value among the selected PSFCHs, which is represented with P smallest . For example, P smallest -W/2 ⁇ P m ⁇ P smallest + W/2, wherein W is a predetermined or a preconfigured number. W may be zero and it means that all the selected PSFCHs will be transmitted with equal power.
  • the transmitting power of PSFCH m is set to the transmitting power for the selected PSFCH with smallest priority value, i.e. P smallest .
  • the selected PSFCHs are transmitted simultaneously with the same PSD. Specifically, if the transmitting power of PSFCH m is less than or equal to the transmitting power for the selected PSFCH with smallest priority value, i.e. P m ⁇ P smallest , and the transmitting power P smallest is less than or equal to the remaining power, i.e.
  • the PSFCH m is selected for transmission and the transmitting power P m is adjusted to be equal to the transmitting power of the PSFCH with smallest priority value among the M PSFCHs, P smallest .
  • the remaining power is set to P remaining -P smallest .
  • Figures 5 (d) illustrates an example for selecting PSFCHs based on Scenario 3.
  • PSFCH 0 there are 5 ordered PSFCHs, PSFCH 0 , PSFCH 1 , PSFCH 2 , PSFCH 3 , and PSFCH 4 with an ascending order, and the transmitting powers of these PSFCHs are P 0 , P 1 , P 2 , P 3 , and P 4 , respectively.
  • the remaining power for transmitting the PSFCHs i.e. P remaining
  • P max the maximum transmitting power of the UE
  • the UE then moves on to the next PSFCH, PSFCH 1 , and determines whether the remaining power complies with the power requirement. In particular, whether the transmitting power of PSFCH 1 is less than or equal to the transmitting power for the PSFCH with smallest priority value, i.e. P 1 ⁇ P smallest , and whether P 0 ⁇ P remaining .
  • PSFCH 1 is not selected either.
  • the UE then goes on to the next PSFCH, PSFCH 2 , the transmitting power of PSFCH 2 is less than or equal to P smallest , and P 0 also is less than or equal to the remaining transmitting power of the UE, i.e. P 0 ⁇ P remaining , thus PSFCH 2 is selected for transmission in the PRB of PSFCH 2 , and is added to a set of PSFCHs later to be transmitted at the same time. Since the same or similar PSD is required, then the transmitting power of P 2 is adjusted to the transmitting power for the PSFCH with smallest priority value among the selected PSFCHs, i.e. P smallest .
  • the UE selects the rest of the PSFCHs similarly. When the selection ends, all the selected PSFCHs have the same PSD, i.e. P smallest . Therefore, the PSD requirement is satisfied.
  • the PSFCH 0 is always selected, due to its highest priority.
  • the transmitting power of PSFCH 0 is min (P 0 , P max ) , and P 0 is equal to the P smallest .
  • P 0 P max , which means the UE does not have any power to transmit another PSFCH, the UE would only transmit PSFCH 0 . If the UE still have some remaining power, then the UE would select PSFCHs according to the above solutions.
  • the PSFCH 0 is selected only if the transmitting power of PSFCH 0 is equal to or smaller than the maximum transmitting power P max .
  • the transmitting power for P m may be adjusted based on the type of the PSFCH. If PSFCH m relates to unicast or groupcast with negative acknowledgement (NACK) only feedback on shared PSFCH resource, the transmitting power of PSFCH m is less than or equal to the transmitting power of the PSFCH with smallest priority value among the M PSFCHs, i.e. P m ⁇ P smallest and P smallest ⁇ P remaining , P m is selected for transmission, then the remaining power is set to P remaining -P smallest . Otherwise, the PSFCH m is not selected and the remaining power remains unchanged.
  • NACK negative acknowledgement
  • PSFCH m relates to groupcast with acknowledgement (ACK) or negative acknowledgement (NACK) feedback on dedicated PSFCH resource, and if P m ⁇ P remaining and P smallest -W/2 ⁇ P m ⁇ P smallest + W/2, , then PSFCH m is selected for transmission in the PRB and the remaining power is set to P remaining -P m . Otherwise, the PSFCH m is not selected and the remaining power remains unchanged.
  • ACK acknowledgement
  • NACK negative acknowledgement
  • Scenario 4 relates to a combination of Scenario 2 and Scenario 3. While the PSFCH m relates to groupcast with acknowledgement (ACK) or negative acknowledgement (NACK) feedback on dedicated PSFCH resource, Scenario 3 is applied; and while the PSFCH m relates to groupcast with acknowledgement (ACK) or negative acknowledgement (NACK) feedback on dedicated PSFCH resource, Scenario 2 is applied.
  • ACK acknowledgement
  • NACK negative acknowledgement
  • Figure 6 illustrates a method performed by a UE for transmitting physical sidelink feedback channels according to a preferred embodiment of the subject disclosure.
  • step 601 the UE selects a first set of PSFCHs from a second set of PSFCHs based on a priority value and a duplex scheme associated with each PSFCH in the second set of PSFCHs.
  • step 602 the UE transmits the first set of PSFCHs. For example, in Figure 4, the UE selects PSFCHs from M PSFCHs, and then transmits the selected PSFCHs.
  • the M PSFCHs are mapped to P PRBs.
  • two PSFCHs, PSFCH 2 and PSFCH 3 are mapped to PRB 3 , and only one PSFCH between the two PSFCHs is selected.
  • the PSFCH is selected based on the priority, and the rule is, the PSFCH with a smallest priority value among the one or more PSFCHs so as to form a third set of PSFCHs.
  • PSFCH 2 has the smaller priority and is selected.
  • the selected PSFCHs form the third set of PSFCHs.
  • the UE selects the first set of PSFCHs from the third set of PSFCHs. For example, the UE can only transmit two PSFCHs at the same time, and then UE selects PSFCH 2 and PSFCH 5 , which have the first two highest priority levels. If the first set is equal to or greater than the third set in size, the third set of PSFCHs is deemed as the first set of PSFCHs. That is, in status 2, there are P PSFCHs selected, if the UE can transmit more than P PSFCHs at the same time, then all of the P PSFCHs in status 2 would be selected into the PSFCHs in status 3.
  • the selecting the first set of PSFCHs is further based on a power requirement for transmitting each PSFCH in the second set of PSFCHs and a remaining transmitting power of a UE. For example, in step 504, a PSFCH m is selected based on whether the transmitting power P m is less than or equal to P remaining .
  • PSFCH 0 then is added to the first set of PSFCHs.
  • the first PSFCH, PSFCH 0 is added to the first set of PSFCHs if the first transmitting power P 0 is equal to or smaller than a maximum transmitting power of a UE, i.e. P 0 ⁇ P max .
  • the first PSFCH is removed from the second set of PSFCHs, which is to be determined whether to be selected, and the remaining transmitting power P remaining is calculated by P remaining minus P 0 .
  • the UE determines whether a second PSFCH, for instance, PSFCH 1 , with a smallest priority value among remaining PSFCHs in the second set of PSFCHs is added to the first set of PSFCHs or not; and then removes PSFCH 1 from the second set of PSFCHs after determining whether the PSFCH 1 is added to the first set of PSFCHs or not.
  • PSFCH 1 is added to the first set of PSFCHs if the transmitting power of PSFCH 1 , i.e. P 1 , is equal to or smaller than the transmitting power of the PSFCH with a smallest priority value among the first set of PSFCHs i.e. P smallest , and is equal to or smaller than the remaining transmitting power of the UE, i.e. P 1 ⁇ P smallest and P 1 ⁇ P remaining .
  • the second PSFCH, PSFCH 1 when the second PSFCH, PSFCH 1, relates to unicast or groupcast with negative acknowledgement (NACK) only feedback on shared PSFCH resource, if P 1 ⁇ P smallest , and there is no PSFCH selected for transmission in the PRB of P m and P 0 ⁇ P remaining , P m is selected for transmission, then the remaining power is set to P remaining -P smallest .
  • NACK negative acknowledgement
  • PSFCH 1 When the second PSFCH, PSFCH 1 , relates to groupcast with acknowledgement (ACK) or negative acknowledgement (NACK) feedback on dedicated PSFCH resource, and if P 1 ⁇ P remaining , and P smallest -W/2 ⁇ P 1 ⁇ P smallest + W/2, and there is no PSFCH selected for transmission in the PRB of P m , PSFCH 1 is selected for transmission in the PRB, then the remaining power is set to P remaining -P 1 .
  • ACK acknowledgement
  • NACK negative acknowledgement
  • FIG. 7 illustrates a block diagram of a UE according to the embodiments of the present disclosure.
  • the UE 101 may include a receiving circuitry, a processor, and a transmitting circuitry.
  • the UE 101 may include a non-transitory computer-readable medium having stored thereon computer-executable instructions; a receiving circuitry; a transmitting circuitry; and a processor coupled to the non-transitory computer-readable medium, the receiving circuitry and the transmitting circuitry.
  • the computer executable instructions can be programmed to implement a method (e.g. the method in Figure 6) with the receiving circuitry, the transmitting circuitry and the processor.
  • the processor of the UE selects a first set of PSFCHs from a second set of PSFCHs based on a priority value and a duplex scheme associated with each PSFCH in the second set of PSFCHs; and transmitting circuitry transmits the first set of PSFCHs.
  • the method of the present disclosure can be implemented on a programmed processor.
  • the controllers, flowcharts, and modules may also be implemented on a general purpose or special purpose computer, a programmed microprocessor or microcontroller and peripheral integrated circuit elements, an integrated circuit, a hardware electronic or logic circuit such as a discrete element circuit, a programmable logic device, or the like.
  • any device that has a finite state machine capable of implementing the flowcharts shown in the figures may be used to implement the processing functions of the present disclosure.

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

Abstract

La présente demande concerne un procédé et un appareil de transmission de canaux de rétroaction de liaison latérale physique. Un mode de réalisation de l'invention concerne un procédé de transmission de canaux de rétroaction de liaison latérale physique (PSFCH), comprenant : la sélection d'un premier ensemble de PSFCH à partir d'un second ensemble de PSFCH sur la base d'une valeur de priorité et d'un schéma de duplexage associé à chaque PSFCH dans le second ensemble de PSFCH; et la transmission du premier ensemble de PSFCH.
PCT/CN2020/085407 2020-04-17 2020-04-17 Procédé et appareil pour transmettre des canaux physiques de rétroaction de liaison latérale WO2021208087A1 (fr)

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WO2024093108A1 (fr) * 2023-03-28 2024-05-10 Lenovo (Beijing) Limited Dispositif terminal et procédé de communications de liaison latérale

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