US20220123904A1 - Shared nack resource for groupcast and multicast in new radio v2x communications - Google Patents

Shared nack resource for groupcast and multicast in new radio v2x communications Download PDF

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US20220123904A1
US20220123904A1 US17/424,667 US201917424667A US2022123904A1 US 20220123904 A1 US20220123904 A1 US 20220123904A1 US 201917424667 A US201917424667 A US 201917424667A US 2022123904 A1 US2022123904 A1 US 2022123904A1
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nack
data
ues
processor
destination ues
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Chien-Yi WANG
Ju-Ya Chen
Tao Chen
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MediaTek Inc
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MediaTek Inc
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    • 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
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1861—Physical mapping arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
    • H04L1/0038—Blind format detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/26—Resource reservation
    • 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
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0097—Relays

Definitions

  • the present disclosure is generally related to wireless communications and, more particularly, to shared negative acknowledgement (NACK) for groupcast and multicast in New Radio (NR) vehicle-to-everything (V2X) communications.
  • NACK shared negative acknowledgement
  • NR New Radio
  • V2X vehicle-to-everything
  • vehicle platooning can support reliable vehicle-to-vehicle (V2V) communications between a specific user equipment (UE) supporting V2X applications and up to nineteen other UEs supporting V2X applications.
  • groupcast and multicast with hybrid automatic repeat request (HARQ) is supported in NR V2X communications. That is, when a source UE transmits data to a group of destination UEs, each of the destination UEs can inform the source UE whether the data has been successfully received or not.
  • the feedback mechanism for HARQ is straightforward and typically involves each destination/receiving UE to transmit an acknowledgement (ACK) or NACK to the source UE through a dedicated time-frequency resource. For groupcast and multicast, this means the required amount of resources for feedback is proportional to the number of destination/receiving UEs. However, this could result in excessive overhead and inefficiency use of available bandwidth, thereby decreasing overall system performance.
  • a method may involve a processor of an apparatus, as a source UE, transmitting data to two or more destination UEs of a plurality of destination UEs via groupcast or multicast with HARQ.
  • the method may also involve the processor receiving a NACK on a single time-frequency resource from at least one of the two or more destination UEs.
  • the single time-frequency resource may be shared by the plurality of destination UEs to transmit the NACK to the source UE.
  • a method may involve a processor of an apparatus, as a destination UE, receiving data from a source UE via groupcast or multicast with HARQ.
  • the method may also involve the processor transmitting a NACK on a single time-frequency resource to the source UE.
  • the single time-frequency resource may be shared by the plurality of destination UEs to transmit the NACK to the source UE.
  • an apparatus may include a communication device and a processor coupled to the communication device.
  • the communication device may be configured to wirelessly communicate with a network.
  • the processor may be configured to transmit, via the communication device and as a source UE, data to two or more destination UEs of a plurality of destination UEs via groupcast or multicast with HARQ.
  • the processor may also be configured to receive, via the communication device, a NACK on a single time-frequency resource from at least one of the two or more destination UEs.
  • the single time-frequency resource may be shared by the plurality of destination UEs to transmit the NACK to the source UE.
  • radio access technologies such as NR V2X and V2V
  • the proposed concepts, schemes and any variation(s)/derivative(s) thereof may be implemented in, for and by other types of radio access technologies, networks and network topologies such as, for example and without limitation, 5 th Generation (5G), Long-Term Evolution (LTE), LTE-Advanced, LTE-Advanced Pro and any future-developed networks and technologies.
  • 5G 5 th Generation
  • LTE Long-Term Evolution
  • LTE-Advanced LTE-Advanced
  • LTE-Advanced Pro any future-developed networks and technologies.
  • FIG. 1 is a diagram of an example network environment in which various solutions and schemes in accordance with the present disclosure may be implemented.
  • FIG. 2 is a diagram of an example scenario in accordance with the present disclosure.
  • FIG. 3 is a diagram of an example scenario in accordance with the present disclosure.
  • FIG. 4 is a diagram of an example scenario in accordance with the present disclosure.
  • FIG. 5 is a block diagram of an example communication environment in which various solutions and schemes in accordance with the present disclosure may be implemented.
  • FIG. 6 is a flowchart of an example process in accordance with an implementation of the present disclosure.
  • FIG. 7 is a flowchart of an example process in accordance with an implementation of the present disclosure.
  • Implementations in accordance with the present disclosure relate to various techniques, methods, schemes and/or solutions pertaining to shared NACK for groupcast and multicast in NR V2X communications.
  • a number of possible solutions may be implemented separately or jointly. That is, although these possible solutions may be described below separately, two or more of these possible solutions may be implemented in one combination or another.
  • FIG. 1 illustrates an example network environment 100 in which various solutions and schemes in accordance with the present disclosure may be implemented.
  • FIG. 2 , FIG. 3 and FIG. 4 illustrates an example scenario 200 , example scenario 300 and scenario 400 , respectively, in accordance with the present disclosure.
  • Each of scenario 200 , scenario 300 and scenario 400 may be implemented in network environment 100 .
  • the following description of various proposed schemes is provided with reference to FIG. 1 ⁇ FIG. 4 .
  • network environment 100 may involve a source UE 110 in wireless communication with a plurality of destination UEs 120 ( 1 ) ⁇ 120 (N), with N being a positive integer greater than 1, that together may form an NR V2X communication network. That is, each of source UE 110 and destination UEs 120 ( 1 ) ⁇ 120 N) may be in or as a part of, for example and without limitation, a vehicle, a roadside unit (RSU) (e.g., a traffic signal, a street lamp, a roadside sensor or a roadside structure), a portable device (e.g., smartphone) or an Internet of Thing (IoT).
  • RSU roadside unit
  • IoT Internet of Thing
  • source UE 110 and destination UEs 120 ( 1 ) ⁇ 120 N) may implement various schemes pertaining to NACK for groupcast and multicast in NR V2X communications in accordance with the present disclosure.
  • a source UE e.g., source UE 110
  • learn whether to perform a retransmission based on certain factors. Firstly, it may not be critical to know which specific destination UE has a decoding failure of the data channel. Secondly, there may be no need to tackle the situation where some destination UEs cannot decode the control channel. Accordingly, a proposed scheme in accordance with the present disclosure aims to use minimum sufficient feedback resource.
  • a single time-frequency resource (e.g., Physical Sidelink Feedback Channel (PSFCH)) may be allocated for feedback, with the single time-frequency resource shared by all the destination UEs 120 ( 1 ) ⁇ 120 (N).
  • PSFCH Physical Sidelink Feedback Channel
  • a destination UE when a destination UE fails to decode the data channel, it may transmit a NACK on the shared time-frequency resource to notify source UE 110 that data transmitted via groupcast and/or multicast has not been successfully decoded by such a destination UE. Otherwise, when the decoding of the data channel is successful, each destination UE would take no action in terms of providing feedback to source UE 110 (i.e., transmitting no ACK to source UE 110 ).
  • PFCH Physical Sidelink Feedback Channel
  • a signal or sequence of the NACK may be the same for all destination UEs 120 ( 1 ) ⁇ 120 (N).
  • source UE 110 may detect the received power level of the NACK signal or sequence on the shared time-frequency resource. In an event that the received power level is higher than a predetermined threshold, source UE 110 may perform a retransmission when a maximum number of transmissions (including retransmissions) has not been reached. Otherwise, in an event that the maximum number of transmissions has been reached, source UE 110 may not perform a retransmission even when the received power level is higher than the predetermined threshold.
  • each of destination UEs 120 ( 1 ) ⁇ 120 (N) may respectively experience success or failure in decoding data transmitted by source UE 110 via groupcast and/or multicast.
  • each of UE 1 and UE 3 succeeded in decoding the data while each of UE 2 and UE 4 failed in decoding the data. Accordingly, neither UE 1 nor UE 3 would transmit an ACK to source UE 110 .
  • each of UE 2 and UE 4 would transmit a NACK (each denoted as SNACK in FIG.
  • the signal detected by source UE 110 may be a combination of the NACK from both UE 2 and UE 4 , with channel response (H 2 +H 4 ) and noise (z NACK ).
  • a receiving (Rx) UE e.g., one of the destination UEs 120 ( 1 ) ⁇ 120 (N)
  • may forward packets received from a transmitting (Tx) UE e.g., UE 110
  • the Tx UE would merely need to ensure that nearby Rx UEs have successfully received the packets.
  • Rx UEs Due to high mobility, it tends to be difficult to have all Rx UEs within a communication coverage of the Tx UE.
  • a group of Rx UEs e.g., 9 Rx UEs shown in FIG. 3
  • PSCCH physical sidelink control channel
  • a subset of the group of Rx UEs e.g., 5 Rx UEs
  • PSSCH physical sidelink shared channel
  • the remaining x % of the Rx UEs may have a lower block error rate (BLER).
  • BLER block error rate
  • the Tx UE may estimate the received power of HARQ NACK (herein denoted as P) sent by one Rx UE at the boundary of PSCCH coverage.
  • a group-size dependent threshold may be set as ⁇ max(x % ⁇ N ⁇ P, P), with N denoting the size of the group.
  • the threshold may serve as a lower bound and thus may be more robust with respect to estimation error.
  • the threshold for the total received power of ACK and NACK may depend on or otherwise be related to the number of Rx UEs (e.g., number of destination UEs 120 ( 1 ) ⁇ 120 (N)).
  • the concept of group size-dependent threshold is further illustrated.
  • the implementation of threshold may be equivalent to counting the number of failed Rx UEs.
  • Part (A) of FIG. 4 illustrates an example instance of HARQ retransmission being not required. In this example, 3 out of the 9 Rx UEs within the PSCCH coverage experience failure in decoding the packets and, thus, the total received power in this example is 3P.
  • Part (B) of FIG. 4 illustrates an example instance of HARQ retransmission being required. In this example, 6 out of the 9 Rx UEs within the PSCCH coverage experience failure in decoding the packets and, thus, the total received power in this example is 6P.
  • FIG. 5 illustrates an example communication environment 500 having an example apparatus 510 and an example apparatus 520 in accordance with an implementation of the present disclosure.
  • apparatus 510 and apparatus 520 may perform various functions to implement schemes, techniques, processes and methods described herein pertaining to shared NACK for groupcast and multicast in NR V2X communications, including various schemes described above as well as processes 600 and 700 described below.
  • Each of apparatus 510 and apparatus 520 may be a part of an electronic apparatus, which may be a UE such as a vehicle, a portable or mobile apparatus, a wearable apparatus, a wireless communication apparatus or a computing apparatus.
  • each of apparatus 510 and apparatus 520 may be implemented in an electronic control unit (ECU) of a vehicle, a smartphone, a smartwatch, a personal digital assistant, a digital camera, or a computing equipment such as a tablet computer, a laptop computer or a notebook computer.
  • ECU electronice control unit
  • Each of apparatus 510 and apparatus 520 may also be a part of a machine type apparatus, which may be an IoT or NB-IoT apparatus such as an immobile or a stationary apparatus, a home apparatus, a wire communication apparatus or a computing apparatus.
  • each of apparatus 510 and apparatus 520 may be implemented in a smart thermostat, a smart fridge, a smart door lock, a wireless speaker or a home control center.
  • each of apparatus 510 and apparatus 520 may be implemented in the form of one or more integrated-circuit (IC) chips such as, for example and without limitation, one or more single-core processors, one or more multi-core processors, or one or more complex-instruction-set-computing (CISC) processors.
  • IC integrated-circuit
  • CISC complex-instruction-set-computing
  • Each of apparatus 510 and apparatus 520 may include at least some of those components shown in FIG. 5 such as a processor 512 and a processor 522 , respectively.
  • Each of apparatus 510 and apparatus 520 may further include one or more other components not pertinent to the proposed scheme of the present disclosure (e.g., internal power supply, display device and/or user interface device), and, thus, such component(s) of each of apparatus 510 and apparatus 520 are neither shown in FIG. 5 nor described below in the interest of simplicity and brevity.
  • components not pertinent to the proposed scheme of the present disclosure e.g., internal power supply, display device and/or user interface device
  • At least one of apparatus 510 and apparatus 520 may be a part of an electronic apparatus, which may be a vehicle, a roadside unit (RSU), network node or base station (e.g., eNB, gNB or TRP), a small cell, a router or a gateway.
  • RSU roadside unit
  • network node or base station e.g., eNB, gNB or TRP
  • a small cell e.g., a small cell
  • a router or a gateway e.g., a gateway.
  • at least one of apparatus 510 and apparatus 520 may be implemented in a vehicle in a V2V or V2X network, an eNodeB in an LTE, LTE-Advanced or LTE-Advanced Pro network or in a gNB in a 5G, NR, IoT or NB-IoT network.
  • apparatus 510 and apparatus 520 may be implemented in the form of one or more IC chips such as, for example and without limitation, one or more single-core processors, one or more multi-core processors, or one or more CISC processors.
  • each of processor 512 and processor 522 may be implemented in the form of one or more single-core processors, one or more multi-core processors, or one or more CISC processors. That is, even though a singular term “a processor” is used herein to refer to processor 512 and processor 522 , each of processor 512 and processor 522 may include multiple processors in some implementations and a single processor in other implementations in accordance with the present disclosure.
  • each of processor 512 and processor 522 may be implemented in the form of hardware (and, optionally, firmware) with electronic components including, for example and without limitation, one or more transistors, one or more diodes, one or more capacitors, one or more resistors, one or more inductors, one or more memristors and/or one or more varactors that are configured and arranged to achieve specific purposes in accordance with the present disclosure.
  • each of processor 512 and processor 522 is a special-purpose machine specifically designed, arranged and configured to perform specific tasks including shared NACK for groupcast and multicast in NR V2X communications in accordance with various implementations of the present disclosure.
  • apparatus 510 may also include a transceiver 516 , as a communication device, coupled to processor 512 and capable of wirelessly transmitting and receiving data.
  • apparatus 510 may further include a memory 514 coupled to processor 512 and capable of being accessed by processor 512 and storing data therein.
  • apparatus 520 may also include a transceiver 526 , as a communication device, coupled to processor 522 and capable of wirelessly transmitting and receiving data.
  • apparatus 520 may further include a memory 524 coupled to processor 522 and capable of being accessed by processor 522 and storing data therein. Accordingly, apparatus 510 and apparatus 520 may wirelessly communicate with each other via transceiver 516 and transceiver 526 , respectively.
  • apparatus 510 is implemented in or as a wireless communication device
  • a communication apparatus or a UE and apparatus 520 is implemented in or as a network node (e.g., base station) connected or otherwise communicatively coupled to a wireless network (e.g., wireless network).
  • a network node e.g., base station
  • wireless network e.g., wireless network
  • processor 512 of apparatus 510 may transmit, via transceiver 516 , data to two or more destination UEs of a plurality of destination UEs (including apparatus 520 ) via groupcast or multicast with HARQ. Moreover, processor 512 may receive, via transceiver 516 , a NACK on a single time-frequency resource from at least one of the two or more destination UEs (e.g., apparatus 520 ). The single time-frequency resource may be shared by the plurality of destination UEs to transmit the NACK to apparatus 310 .
  • processor 512 in receiving the NACK, may receive the NACK in response to at least one of the two or more destination UEs failing to decode the data. Moreover, processor 512 may receive no ACK in response to each of the two or more destination UEs successfully decoding the data.
  • a signal or sequence of the NACK may be same for all of the plurality of destination UEs. That is, all the destination UEs may transmit the NACK using the same signal or sequence on the shared time-frequency resource.
  • processor 512 in receiving the NACK, may detect a signal or sequence of the NACK on the single time-frequency resource.
  • processor 512 may perform additional operations. For instance, processor 512 may perform, via transceiver 516 , a retransmission of the data in response to a received power level of a signal or sequence of the NACK exceeding a predetermined threshold. In some implementations, in performing the retransmission of the data, processor 512 performing certain operations. For instance, processor 512 may determine whether a maximum number of transmissions of the data has been reached. Moreover, processor 512 may perform the retransmission of the data responsive to: (1) the received power level of the signal or sequence of the NACK exceeding the predetermined threshold, and (2) the maximum number of transmissions of the data having not been reached.
  • processor 512 in transmitting and receiving, may transmit and receive in compliance with an NR V2X communication specification.
  • a threshold for a total received power of NACK received from the plurality of destination UEs is related to a number of UEs among the plurality of destination UEs.
  • processor 522 of apparatus 520 may receive, via transceiver 526 , data from a source UE (e.g., apparatus 510 ) via groupcast or multicast with HARQ. Moreover, processor 522 may transmit, via transceiver 526 , a NACK on a single time-frequency resource to the source UE.
  • the single time-frequency resource may be shared by the plurality of destination UEs to transmit the NACK to apparatus 510 as the source UE.
  • processor 522 may transmit the NACK in response to a failure in decoding the data. Moreover, processor 522 may transmit no ACK in response to a success in decoding the data.
  • a signal or sequence of the NACK may be same for all of the plurality of destination UEs. That is, all the destination UEs, including apparatus 520 , may transmit the NACK using the same signal or sequence on the shared time-frequency resource.
  • processor 522 may perform additional operations. For instance, processor 522 may receive, via transceiver 526 , a retransmission of the data in response to a power level of a signal or sequence of the NACK received by apparatus 510 exceeding a predetermined threshold. In some implementations, in receiving the retransmission of the data, process 700 may involve processor 522 receiving the retransmission of the data in response to: (1) the power level of the signal or sequence of the NACK received by apparatus 510 exceeding the predetermined threshold, and (2) a maximum number of transmissions of the data by apparatus 510 having not been reached.
  • processor 522 may receive and transmit in compliance with an NR V2X communication specification.
  • a threshold for a total received power of NACK received from the plurality of destination UEs is related to a number of UEs among the plurality of destination UEs.
  • FIG. 6 illustrates an example process 600 in accordance with an implementation of the present disclosure.
  • Process 600 may be an example implementation of the proposed schemes described above with respect to shared NACK for groupcast and multicast in NR V2X communications in accordance with the present disclosure.
  • Process 600 may represent an aspect of implementation of features of apparatus 510 and apparatus 520 .
  • Process 600 may include one or more operations, actions, or functions as illustrated by one or more of blocks 610 and 620 . Although illustrated as discrete blocks, various blocks of process 600 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks of process 600 may be executed in the order shown in FIG. 6 or, alternatively, in a different order. Process 600 may also be repeated partially or entirely.
  • Process 600 may be implemented by apparatus 510 , apparatus 520 and/or any suitable wireless communication device, UE, roadside unit (RUS), base station or machine type devices. Solely for illustrative purposes and without limitation, process 600 is described below in the context of apparatus 510 as a source UE (e.g., UE 110 ) and apparatus 520 as a destination UE (e.g., UE 120 ( 1 )) of a plurality of destination UEs (e.g., UE 120 ( 1 ) ⁇ UE 120 (N) in network environment 100 ). Process 600 may begin at block 610 .
  • process 600 may involve processor 512 of apparatus 510 , as a source UE, transmitting, via transceiver 516 , data to two or more destination UEs of a plurality of destination UEs (including apparatus 520 ) via groupcast or multicast with HARQ.
  • Process 600 may proceed from 610 to 620 .
  • process 600 may involve processor 512 receiving, via transceiver 516 , a NACK on a single time-frequency resource from at least one of the two or more destination UEs (e.g., apparatus 520 ).
  • the single time-frequency resource may be shared by the plurality of destination UEs to transmit the NACK to apparatus 510 .
  • process 600 in receiving the NACK, may involve processor 512 receiving the NACK in response to at least one of the two or more destination UEs failing to decode the data. Moreover, process 600 may involve processor 512 receiving no ACK in response to each of the two or more destination UEs successfully decoding the data.
  • a signal or sequence of the NACK may be same for all of the plurality of destination UEs. That is, all the destination UEs may transmit the NACK using the same signal or sequence on the shared time-frequency resource.
  • process 600 may involve processor 512 detecting a signal or sequence of the NACK on the single time-frequency resource.
  • process 600 may involve processor 512 performing additional operations. For instance, process 600 may involve processor 512 performing, via transceiver 516 , a retransmission of the data in response to a received power level of a signal or sequence of the NACK exceeding a predetermined threshold. In some implementations, in performing the retransmission of the data, process 600 may involve processor 512 performing certain operations. For instance, process 600 may involve processor 512 determining whether a maximum number of transmissions of the data has been reached. Moreover, process 600 may involve processor 512 performing the retransmission of the data responsive to: (1) the received power level of the signal or sequence of the NACK exceeding the predetermined threshold, and (2) the maximum number of transmissions of the data having not been reached.
  • process 600 may involve processor 512 transmitting and receiving in compliance with an NR V2X communication specification.
  • a threshold for a total received power of NACK received from the plurality of destination UEs is related to a number of UEs among the plurality of destination UEs.
  • FIG. 7 illustrates an example process 700 in accordance with an implementation of the present disclosure.
  • Process 700 may be an example implementation of the proposed schemes described above with respect to shared NACK for groupcast and multicast in NR V2X communications in accordance with the present disclosure.
  • Process 700 may represent an aspect of implementation of features of apparatus 510 and apparatus 520 .
  • Process 700 may include one or more operations, actions, or functions as illustrated by one or more of blocks 710 and 720 . Although illustrated as discrete blocks, various blocks of process 700 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks of process 700 may executed in the order shown in FIG. 7 or, alternatively, in a different order. Process 700 may also be repeated partially or entirely.
  • Process 500 may be implemented by apparatus 510 , apparatus 520 and/or any suitable wireless communication device, UE, roadside unit (RUS), base station or machine type devices. Solely for illustrative purposes and without limitation, process 700 is described below in the context of apparatus 510 as a source UE (e.g., UE 110 ) and apparatus 520 as a destination UE (e.g., UE 120 ( 1 )) of a plurality of destination UEs (e.g., UE 120 ( 1 ) ⁇ UE 120 (N) in network environment 100 ). Process 700 may begin at block 710 .
  • process 700 may involve processor 522 of apparatus 520 , as a destination UE a plurality of destination UEs, receiving, via transceiver 526 , data from a source UE (e.g., apparatus 510 ) via groupcast or multicast with HARQ.
  • Process 700 may proceed from 710 to 720 .
  • process 700 may involve processor 522 transmitting, via transceiver 526 , a NACK on a single time-frequency resource to the source UE.
  • the single time-frequency resource may be shared by the plurality of destination UEs to transmit the NACK to the source UE.
  • process 700 in transmitting the NACK, may involve processor 522 transmitting the NACK in response to a failure in decoding the data. Moreover, process 700 may involve processor 522 transmitting no ACK in response to a success in decoding the data.
  • a signal or sequence of the NACK may be same for all of the plurality of destination UEs. That is, all the destination UEs, including apparatus 520 , may transmit the NACK using the same signal or sequence on the shared time-frequency resource.
  • process 700 may involve processor 522 performing additional operations. For instance, process 700 may involve processor 522 receiving, via transceiver 526 , a retransmission of the data in response to a power level of a signal or sequence of the NACK received by the source UE exceeding a predetermined threshold. In some implementations, in receiving the retransmission of the data, process 700 may involve processor 522 receiving the retransmission of the data in response to: (1) the power level of the signal or sequence of the NACK received by the source UE exceeding the predetermined threshold, and (2) a maximum number of transmissions of the data by the source UE having not been reached.
  • process 700 may involve processor 522 receiving and transmitting in compliance with an NR V2X communication specification.
  • a threshold for a total received power of NACK received from the plurality of destination UEs is related to a number of UEs among the plurality of destination UEs.
  • any two components so associated can also be viewed as being “operably connected”, or “operably coupled”, to each other to achieve the desired functionality, and any two components capable of being so associated can also be viewed as being “operably couplable”, to each other to achieve the desired functionality.
  • operably couplable include but are not limited to physically mateable and/or physically interacting components and/or wirelessly interactable and/or wirelessly interacting components and/or logically interacting and/or logically interactable components.

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