WO2024093399A1 - Transmissions par psfch sur un spectre sans licence - Google Patents

Transmissions par psfch sur un spectre sans licence Download PDF

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Publication number
WO2024093399A1
WO2024093399A1 PCT/CN2023/110236 CN2023110236W WO2024093399A1 WO 2024093399 A1 WO2024093399 A1 WO 2024093399A1 CN 2023110236 W CN2023110236 W CN 2023110236W WO 2024093399 A1 WO2024093399 A1 WO 2024093399A1
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WIPO (PCT)
Prior art keywords
transmission
psfch
rbs
resource
groupcast
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PCT/CN2023/110236
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English (en)
Inventor
Zhennian SUN
Haipeng Lei
Xiaodong Yu
Zhi YAN
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Lenovo Beijing Ltd
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Lenovo Beijing Ltd
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Priority to PCT/CN2023/110236 priority Critical patent/WO2024093399A1/fr
Publication of WO2024093399A1 publication Critical patent/WO2024093399A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H04W4/08—User group management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/40—Connection management for selective distribution or broadcast

Definitions

  • the present disclosure relates to wireless communications, and more specifically to physical sidelink feedback channel (PSFCH) transmissions on an unlicensed spectrum.
  • PSFCH physical sidelink feedback channel
  • a wireless communications system may include one or multiple network communication devices, such as base stations, which may be otherwise known as an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology.
  • Each network communication devices such as a base station may support wireless communications for one or multiple user communication devices, which may be otherwise known as user equipment (UE) , or other suitable terminology.
  • the wireless communications system may support wireless communications with one or multiple user communication devices by utilizing resources of the wireless communication system (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers) .
  • the wireless communications system may support wireless communications across various radio access technologies including third generation (3G) radio access technology, fourth generation (4G) radio access technology, fifth generation (5G) radio access technology, among other suitable radio access technologies beyond 5G (e.g., sixth generation (6G) ) .
  • 3G third generation
  • 4G fourth generation
  • 5G fifth generation
  • 6G sixth generation
  • 3GPP release 16 Rel-16
  • HARQ hybrid automatic repeat request
  • 3GPP release 18 Rel-18
  • HARQ feedback for the sidelink transmission on an unlicensed spectrum is a suitable way to achieve the high reliability of sidelink communications.
  • enhancements on the PSFCH transmissions on the unlicensed spectrum are still needed.
  • the present disclosure relates to apparatuses, methods, and systems that support PSFCH transmissions on an unlicensed spectrum. With the apparatuses and methods, it is possible to improve the capacity of the PSFCH resources and thus improve sidelink communication efficiency.
  • a terminal device comprising at least one memory; and at least one processor coupled with the at least one memory and configured to cause the UE to: determine a transmission resource for a groupcast transmission, based on a number of candidate physical sidelink feedback channel (PSFCH) resources associated with the groupcast transmission and a number of group members communicating with the UE; perform the groupcast transmission based on the transmission resource; and receive, from the group members, positive-negative acknowledgement for the groupcast transmission.
  • PSFCH physical sidelink feedback channel
  • a method performed by the UE comprises: determining a transmission resource for a groupcast transmission, based on a number of candidate physical sidelink feedback channel (PSFCH) resources associated with the groupcast transmission and a number of group members communicating with the UE; performing the groupcast transmission based on the transmission resource; and receiving, from the group members, positive-negative acknowledgement for the groupcast transmission.
  • PSFCH physical sidelink feedback channel
  • a processor for wireless communication comprises at least one controller coupled with at least one memory and configured to cause the at least one processor to: determine a transmission resource for a groupcast transmission, based on a number of candidate physical sidelink feedback channel (PSFCH) resources associated with the groupcast transmission and a number of group members communicating with the UE; perform the groupcast transmission based on the transmission resource; and receive, from the group members, positive-negative acknowledgement for the groupcast transmission.
  • PSFCH physical sidelink feedback channel
  • determining the transmission resource comprises: selecting, from one or more candidate resource pools configured with candidate PSFCH resources, a resource pool configured with a PSFCH occupying a dedicated interlace, based on determining that the number of candidate PSFCH resources of the resource pool is greater than or equal to the number of group members.
  • determining the transmission resource comprises: determining a frequency domain resource for the groupcast transmission as a plurality of subchannels, the number of candidate PSFCH resources associated with the plurality of subchannels being greater than or equal to the number of group members.
  • a period of the candidate PSFCH resources comprises a first plurality of slots
  • determining the transmission resource comprises: determining a time domain resource for the groupcast transmission as a second plurality of slots, the candidate PSFCH resources associated with the second plurality of slots being in a same PSFCH transmission occasion.
  • the groupcast transmission in the second plurality of slots occupies a same subchannel in a frequency domain.
  • the candidate PSFCH resources associated with the second plurality of slots are used by the group members in the PSFCH transmission occasion.
  • a number of the first plurality of slots is the same as a number of the second plurality of slots.
  • Some implementations of the method and apparatuses described herein may further include applying an orthogonal cover code (OCC) sequence within the dedicated interlace.
  • OCC orthogonal cover code
  • the OCC sequence is applied to a plurality of consecutive resource blocks (RBs) within the dedicated interlace.
  • the OCC sequence is not applied to remaining one or more RBs if a number of the remaining one or more RBs is smaller than a length of the OCC sequence, the remaining one or more RBs being determined by excluding the plurality of consecutive RBs from the dedicated interlace.
  • receiving the positive-negative acknowledgement comprises: performing no detection for the positive-negative acknowledgement on the remaining one or more RBs.
  • Some implementations of the method and apparatuses described herein may further include transmitting, to the group members in sidelink control information (SCI) , an indication indicating at least one of the following: a length of the OCC sequence; or whether to apply the OCC sequence.
  • SCI sidelink control information
  • Some implementations of the method and apparatuses described herein may further include mapping a long sequence for the PSFCH to a first plurality of RBs within the dedicated interlace, the long sequence occupying a second plurality of RBs.
  • receiving positive-negative acknowledgement comprises: performing no detection for the positive-negative acknowledgement on remaining one or more RBs if a number of the remaining one or more RBs is smaller than a number of the second plurality of RBs, the remaining one or more RBs being determined by excluding the first plurality of RBs from the dedicated interlace.
  • a number of the second plurality of RBs is pre-defined or indicated in an SCI. In some implementations of the method and the UE described herein, a number of the second plurality of RBs is configured per resource pool.
  • FIG. 1 illustrates an example of a wireless communications system that supports PSFCH transmissions on an unlicensed spectrum in accordance with aspects of the present disclosure
  • FIG. 2 illustrates a flowchart of a method that supports PSFCH transmissions on an unlicensed spectrum in accordance with aspects of the present disclosure
  • FIG. 3 illustrates an example resource pool configuration in accordance with aspects of the present disclosure
  • FIG. 4 illustrates an example resource pool configuration in accordance with aspects of the present disclosure
  • FIG. 7 illustrates an example of a device that supports PSFCH transmissions on an unlicensed spectrum in accordance with aspects of the present disclosure.
  • FIG. 8 illustrates an example of a processor that supports PSFCH transmissions on an unlicensed spectrum in accordance with aspects of the present disclosure.
  • references in the present disclosure to “one embodiment, ” “an example embodiment, ” “an embodiment, ” “some embodiments, ” and the like indicate that the embodiment (s) described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases do not necessarily refer to the same embodiment (s) . Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
  • first and second may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could also be termed as a second element, and similarly, a second element could also be termed as a first element, without departing from the scope of embodiments.
  • the term “and/or” includes any and all combinations of one or more of the listed terms. In some examples, values, procedures, or apparatuses 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.
  • the term “includes” and its variants are to be read as open terms that mean “includes, but is not limited to. ”
  • the term “based on” is to be read as “based at least in part on. ”
  • the term “one embodiment” and “an embodiment” are to be read as “at least one embodiment. ”
  • the term “another embodiment” is to be read as “at least one other embodiment. ”
  • the use of an expression such as “A and/or B” can mean either “only A” or “only B” or “both A and B. ”
  • Other definitions, explicit and implicit, may be included below.
  • HARQ feedback for sidelink transmission on an unlicensed spectrum is a suitable way to achieve the high reliability of sidelink communications.
  • the support of sidelink on an unlicensed spectrum has been discussed as follows.
  • legacy PSFCH and resource mapping have been specified, for example, in the technical specification (TS) 38.213 as follows:
  • HARQ feedback may be classified as two options, also referred to as HARQ feedback option 1 and HARQ feedback option 2.
  • HARQ feedback option 1 only non-acknowledgement (NACK) is fed back to the transmit UE.
  • HARQ feedback option 2 acknowledgement (ACK) or NACK is fed back to the transmit UE.
  • DTX discontinuous transmission
  • LBT listen-before-talk
  • resource pool selection has been specified, for example, in TS 38.321, as follows.
  • the inventors have noticed that the capacity of the PSFCH resources is limited, especially when HARQ feedback option 2 (i.e. with positive-negative acknowledgement) is applied in the sidelink groupcast transmission. For example, if an SCS of a bandwidth part (BWP) is configured as 30kHz, there are 5 interlaces within one RB set. If the groupcast with HARQ feedback option 2 is transmitted on a sub-channel, the number of available PSFCH resources is only 6 when the number of cyclic shift pairs is configured to 6. In this case, the PSFCH structure Alt 2-3a cannot support groupcast with HARQ feedback option 2 well.
  • BWP bandwidth part
  • Embodiments of the present disclosure provide a solution for PSFCH transmissions on the unlicensed spectrum.
  • a UE determines a transmission resource for a groupcast transmission, based on a number of candidate PSFCH resources associated with the groupcast transmission and a number of group members communicating with the UE. Then, the UE performs the groupcast transmission based on the transmission resource. Moreover, the UE receives, from the group members, positive-negative acknowledgement for the groupcast transmission.
  • this solution allows ensuring that there are sufficient PSFCH resources for transmitting the HARQ feedback for the groupcast transmission. In this way, it is possible to improve the capacity of the PSFCH resources, and thus improve sidelink transmission efficiency.
  • positive-negative acknowledgement refer to HARQ feedback that includes ACK or NACK, when HARQ feedback option 2 is applied.
  • the “positive acknowledgement” may be used with the same meaning as “ACK”
  • the “negative acknowledgement” may be used with the same meaning as “NACK” .
  • FIG. 1 illustrates an example of a wireless communications system 100 that supports PSFCH transmissions on an unlicensed spectrum in accordance with aspects of the present disclosure.
  • the wireless communications system 100 may include one or more network entities 102 (also referred to as network equipment (NE) ) , one or more UEs 104, a core network 106, and a packet data network 108.
  • the wireless communications system 100 may support various radio access technologies.
  • the wireless communications system 100 may be a 4G network, such as a long term evolution (LTE) network or an LTE-Advanced (LTE-A) network.
  • LTE long term evolution
  • LTE-A LTE-Advanced
  • the wireless communications system 100 may be a 5G network, such as a new radio (NR) network.
  • NR new radio
  • the wireless communications system 100 may be a combination of a 4G network and a 5G network, or other suitable radio access technology including Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20.
  • IEEE Institute of Electrical and Electronics Engineers
  • Wi-Fi Wi-Fi
  • WiMAX IEEE 802.16
  • IEEE 802.20 The wireless communications system 100 may support radio access technologies beyond 5G. Additionally, the wireless communications system 100 may support technologies, such as time division multiple access (TDMA) , frequency division multiple access (FDMA) , or code division multiple access (CDMA) , etc.
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • CDMA code division multiple access
  • the one or more network entities 102 may be dispersed throughout a geographic region to form the wireless communications system 100.
  • One or more of the network entities 102 described herein may be or include or may be referred to as a network node, a base station, a network element, a radio access network (RAN) , a base transceiver station, an access point, a NodeB, an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology.
  • a network entity 102 and a UE 104 may communicate via a communication link 110, which may be a wireless or wired connection.
  • a network entity 102 and a UE 104 may perform wireless communication (e.g., receive signaling, transmit signaling) over a Uu interface.
  • a network entity 102 may provide a geographic coverage area 112 for which the network entity 102 may support services (e.g., voice, video, packet data, messaging, broadcast, etc. ) for one or more UEs 104 within the geographic coverage area 112.
  • a network entity 102 and a UE 104 may support wireless communication of signals related to services (e.g., voice, video, packet data, messaging, broadcast, etc. ) according to one or multiple radio access technologies.
  • a network entity 102 may be moveable, for example, a satellite associated with a non-terrestrial network.
  • different geographic coverage areas 112 associated with the same or different radio access technologies may overlap, but the different geographic coverage areas 112 may be associated with different network entities 102.
  • Information and signals described herein may be represented using any of a variety of different technologies and techniques.
  • data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
  • the one or more UEs 104 may be dispersed throughout a geographic region of the wireless communications system 100.
  • a UE 104 may include or may be referred to as a mobile device, a wireless device, a remote device, a remote unit, a handheld device, or a subscriber device, or some other suitable terminology.
  • the UE 104 may be referred to as a unit, a station, a terminal, or a client, among other examples.
  • the UE 104 may be referred to as an Internet-of-Things (IoT) device, an Internet-of-Everything (IoE) device, or machine-type communication (MTC) device, among other examples.
  • IoT Internet-of-Things
  • IoE Internet-of-Everything
  • MTC machine-type communication
  • a UE 104 may be stationary in the wireless communications system 100.
  • a UE 104 may be mobile in the wireless communications system 100.
  • the one or more UEs 104 may be devices in different forms or having different capabilities. Some examples of UEs 104 are illustrated in FIG. 1.
  • a UE 104 may be capable of communicating with various types of devices, such as the network entities 102, other UEs 104, or network equipment (e.g., the core network 106, the packet data network 108, a relay device, an integrated access and backhaul (IAB) node, or another network equipment) , as shown in FIG. 1.
  • a UE 104 may support communication with other network entities 102 or UEs 104, which may act as relays in the wireless communications system 100.
  • a UE 104 may also be able to support wireless communication directly with other UEs 104 over a communication link 114.
  • a UE 104 may support wireless communication directly with another UE 104 over a device-to-device (D2D) communication link.
  • D2D device-to-device
  • the communication link 114 may be referred to as a sidelink (SL) .
  • a UE 104 may support wireless communication directly with another UE 104 over a PC5 interface.
  • a network entity 102 may support communications with the core network 106, or with another network entity 102, or both.
  • a network entity 102 may interface with the core network 106 through one or more backhaul links 116 (e.g., via an S1, N2, N2, or another network interface) .
  • the network entities 102 may communicate with each other over the backhaul links 116 (e.g., via an X2, Xn, or another network interface) .
  • the network entities 102 may communicate with each other directly (e.g., between the network entities 102) .
  • the network entities 102 may communicate with each other or indirectly (e.g., via the core network 106) .
  • one or more network entities 102 may include subcomponents, such as an access network entity, which may be an example of an access node controller (ANC) .
  • An ANC may communicate with the one or more UEs 104 through one or more other access network transmission entities, which may be referred to as a radio heads, smart radio heads, or transmission-reception points (TRPs) .
  • TRPs transmission-reception points
  • a network entity 102 may be configured in a disaggregated architecture, which may be configured to utilize a protocol stack physically or logically distributed among two or more network entities 102, such as an integrated access backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance) , or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN) ) .
  • IAB integrated access backhaul
  • O-RAN open RAN
  • vRAN virtualized RAN
  • C-RAN cloud RAN
  • a network entity 102 may include one or more of a central unit (CU) , a distributed unit (DU) , a radio unit (RU) , a RAN Intelligent Controller (RIC) (e.g., a Near-Real Time RIC (Near-RT RIC) , a Non-Real Time RIC (Non-RT RIC) ) , a Service Management and Orchestration (SMO) system, or any combination thereof.
  • CU central unit
  • DU distributed unit
  • RU radio unit
  • RIC RAN Intelligent Controller
  • RIC e.g., a Near-Real Time RIC (Near-RT RIC) , a Non-Real Time RIC (Non-RT RIC)
  • SMO Service Management and Orchestration
  • An RU may also be referred to as a radio head, a smart radio head, a remote radio head (RRH) , a remote radio unit (RRU) , or a transmission reception point (TRP) .
  • One or more components of the network entities 102 in a disaggregated RAN architecture may be co-located, or one or more components of the network entities 102 may be located in distributed locations (e.g., separate physical locations) .
  • one or more network entities 102 of a disaggregated RAN architecture may be implemented as virtual units (e.g., a virtual CU (VCU) , a virtual DU (VDU) , a virtual RU (VRU) ) .
  • VCU virtual CU
  • VDU virtual DU
  • VRU virtual RU
  • Split of functionality between a CU, a DU, and an RU may be flexible and may support different functionalities depending upon which functions (e.g., network layer functions, protocol layer functions, baseband functions, radio frequency functions, and any combinations thereof) are performed at a CU, a DU, or an RU.
  • functions e.g., network layer functions, protocol layer functions, baseband functions, radio frequency functions, and any combinations thereof
  • a functional split of a protocol stack may be employed between a CU and a DU such that the CU may support one or more layers of the protocol stack and the DU may support one or more different layers of the protocol stack.
  • the CU may host upper protocol layer (e.g., a layer 3 (L3) , a layer 2 (L2) ) functionality and signaling (e.g., Radio Resource Control (RRC) , service data adaption protocol (SDAP) , Packet Data Convergence Protocol (PDCP) ) .
  • RRC Radio Resource Control
  • SDAP service data adaption protocol
  • PDCP Packet Data Convergence Protocol
  • the CU may be connected to one or more DUs or RUs, and the one or more DUs or RUs may host lower protocol layers, such as a layer 1 (L1) (e.g., physical (PHY) layer) or an L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU.
  • L1 e.g., physical (PHY) layer
  • L2 e.g., radio link control (RLC) layer, medium access control
  • a functional split of the protocol stack may be employed between a DU and an RU such that the DU may support one or more layers of the protocol stack and the RU may support one or more different layers of the protocol stack.
  • the DU may support one or multiple different cells (e.g., via one or more RUs) .
  • a functional split between a CU and a DU, or between a DU and an RU may be within a protocol layer (e.g., some functions for a protocol layer may be performed by one of a CU, a DU, or an RU, while other functions of the protocol layer are performed by a different one of the CU, the DU, or the RU) .
  • a CU may be functionally split further into CU control plane (CU-CP) and CU user plane (CU-UP) functions.
  • a CU may be connected to one or more DUs via a midhaul communication link (e.g., F1, F1 c, F1 u)
  • a DU may be connected to one or more RUs via a fronthaul communication link (e.g., open fronthaul (FH) interface)
  • FH open fronthaul
  • a midhaul communication link or a fronthaul communication link may be implemented in accordance with an interface (e.g., a channel) between layers of a protocol stack supported by respective network entities 102 that are in communication via such communication links .
  • the core network 106 may support user authentication, access authorization, tracking, connectivity, and other access, routing, or mobility functions.
  • the core network 106 may be an evolved packet core (EPC) , or a 5G core (5GC) , which may include a control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management functions (AMF) ) and a user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) .
  • EPC evolved packet core
  • 5GC 5G core
  • MME mobility management entity
  • AMF access and mobility management functions
  • S-GW serving gateway
  • PDN gateway Packet Data Network gateway
  • UPF user plane function
  • control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management (e.g., data bearers, signal bearers, etc. ) for the one or more UEs 104 served by the one or more network entities 102 associated with the core network 106.
  • NAS non-access stratum
  • the core network 106 may communicate with the packet data network 108 over one or more backhaul links 116 (e.g., via an S1, N2, N3, or another network interface) .
  • the packet data network 108 may include an application server 118.
  • one or more UEs 104 may communicate with the application server 118.
  • a UE 104 may establish a session (e.g., a protocol data unit (PDU) session, or the like) with the core network 106 via a network entity 102.
  • the core network 106 may route traffic (e.g., control information, data, and the like) between the UE 104 and the application server 118 using the established session (e.g., the established PDU session) .
  • the PDU session may be an example of a logical connection between the UE 104 and the core network 106 (e.g., one or more network functions of the core network 106) .
  • the network entities 102 and the UEs 104 may use resources of the wireless communications system 100 (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers) ) to perform various operations (e.g., wireless communications) .
  • the network entities 102 and the UEs 104 may support different resource structures.
  • the network entities 102 and the UEs 104 may support different frame structures.
  • the network entities 102 and the UEs 104 may support a single frame structure.
  • the network entities 102 and the UEs 104 may support various frame structures (i.e., multiple frame structures) .
  • the network entities 102 and the UEs 104 may support various frame structures based on one or more numerologies.
  • One or more numerologies may be supported in the wireless communications system 100, and a numerology may include a subcarrier spacing and a cyclic prefix.
  • a first subcarrier spacing e.g., 15 kHz
  • a normal cyclic prefix e.g. 15 kHz
  • the first numerology associated with the first subcarrier spacing (e.g., 15 kHz) may utilize one slot per subframe.
  • a time interval of a resource may be organized according to frames (also referred to as radio frames) .
  • Each frame may have a duration, for example, a 10 millisecond (ms) duration.
  • each frame may include multiple subframes.
  • each frame may include 10 subframes, and each subframe may have a duration, for example, a 1 ms duration.
  • each frame may have the same duration.
  • each subframe of a frame may have the same duration.
  • a time interval of a resource may be organized according to slots.
  • a subframe may include a number (e.g., quantity) of slots.
  • the number of slots in each subframe may also depend on the one or more numerologies supported in the wireless communications system 100.
  • Each slot may include a number (e.g., quantity) of symbols (e.g., OFDM symbols) .
  • the number (e.g., quantity) of slots for a subframe may depend on a numerology.
  • a slot For a normal cyclic prefix, a slot may include 14 symbols.
  • a slot For an extended cyclic prefix (e.g., applicable for 60 kHz subcarrier spacing) , a slot may include 12 symbols.
  • an electromagnetic (EM) spectrum may be split, based on frequency or wavelength, into various classes, frequency bands, frequency channels, etc.
  • the wireless communications system 100 may support one or multiple operating frequency bands, such as frequency range designations FR1 (410 MHz –7.125 GHz) , FR2 (24.25 GHz –52.6 GHz) , FR3 (7.125 GHz –24.25 GHz) , FR4 (52.6 GHz –114.25 GHz) , FR4a or FR4-1 (52.6 GHz –71 GHz) , and FR5 (114.25 GHz – 300 GHz) .
  • FR1 410 MHz –7.125 GHz
  • FR2 24.25 GHz –52.6 GHz
  • FR3 7.125 GHz –24.25 GHz
  • FR4 (52.6 GHz –114.25 GHz)
  • FR4a or FR4-1 52.6 GHz –71 GHz
  • FR5 114.25 GHz
  • the network entities 102 and the UEs 104 may perform wireless communications over one or more of the operating frequency bands.
  • FR1 may be used by the network entities 102 and the UEs 104, among other equipment or devices for cellular communications traffic (e.g., control information, data) .
  • FR2 may be used by the network entities 102 and the UEs 104, among other equipment or devices for short-range, high data rate capabilities.
  • FR1 may be associated with one or multiple numerologies (e.g., at least three numerologies) .
  • FR2 may be associated with one or multiple numerologies (e.g., at least 2 numerologies) .
  • FIG. 2 illustrates a flowchart of a method 200 that supports PSFCH transmissions on an unlicensed spectrum in accordance with aspects of the present disclosure.
  • the operations of the method 200 may be implemented by a device or its components as described herein.
  • the operations of the method 200 may be performed by the UE 104 as described herein.
  • the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.
  • the method 200 will be described with reference to FIG. 1.
  • the method may include determining a transmission resource for a groupcast transmission, based on the number of candidate PSFCH resources associated with the groupcast transmission and the number of group members communicating with the UE.
  • the number of group members may be associated with the group size which comprises the number of group members and the transmit UE (i.e. the UE 104) .
  • the method may include performing the groupcast transmission based on the transmission resource. After receiving the groupcast transmission, the group members may provide the HARQ feedback for the groupcast transmission.
  • HARQ feedback option 2 (i.e., positive-negative acknowledgement) may be taken as an example approach of the HARQ feedback for the groupcast transmission. Then, at 230, the method may include receiving, from the group members, the positive-negative acknowledgement for the groupcast transmission.
  • At least one resource pool may be configured with PSFCH resources if at least a logic channel configured with sl-HARQ-FeedbackEnabled is set to enabled.
  • a MAC layer of the UE 104 may select a resource pool from the least one resource pool configured with PSFCH resources.
  • At least one resource pool may be configured with a PSFCH of structure Alt 2-3a where the PSFCH transmission occupies a dedicated interlace.
  • the UE 104 may select, from one or more candidate resource pools configured with candidate PSFCH resources, a resource pool configured with a PSFCH occupying a dedicated interlace (i.e. a PSFCH of structure Alt 2-3a) , based on a determination that the number of candidate PSFCH resources of the resource pool is greater than or equal to the number of group members.
  • PSFCH structure Alt 2-3a may be taken as an example structure for the groupcast transmission with positive-negative acknowledgement.
  • the resource pool of structure Alt 2-3a may be selected if the number of group members is not greater than 6.
  • the resource pool of structure Alt 2-3a may be selected if the number of group members is not greater than 12.
  • the UE 104 may determine a frequency domain resource for the groupcast transmission with a consideration of the number of candidate PSFCH resources associated with the sidelink grant and the number of group members.
  • the number of candidate PSFCH resources associated with the sidelink grant may depend on the number of subchannels occupied by the groupcast transmission.
  • the number of subchannels may be determined by the MAC layer of the UE 104.
  • the MAC layer of the UE 104 may determine the number of subchannels based on the number of candidate PSFCH resources associated with the sidelink grant and the number of group members.
  • the UE 104 may select the number of subchannels to ensure that the number of candidate PSFCH resources is not smaller than the group size.
  • the frequency domain resource for the groupcast transmission may be determined as a plurality of subchannels, if it is ensured that the number of candidate PSFCH resources associated with the plurality of subchannels is greater than or equal to the number of group members.
  • FIG. 3 illustrates an example resource pool configuration in accordance with aspects of the present disclosure.
  • a sidelink groupcast transmission occupies two subchannels, there are 12 candidate PSFCH resources associated with this transmission.
  • a period of the candidate PSFCH resources may comprise a plurality of slots (also referred to a first plurality of slots, for example, 2 or 4 slots) , and in this case, the UE 104 may determine a time domain resource for the groupcast transmission as a plurality of slots (also referred to as a second plurality of slots) .
  • the candidate PSFCH resources associated with the second plurality of slots may be in the same PSFCH transmission occasion, or in other words, the candidate PSFCH resources of the groupcast transmission occupying the second plurality of slots may be in the same PSFCH transmission occasion.
  • the candidate PSFCH resources associated with the second plurality of slots may be used by the group members in the PSFCH transmission occasion.
  • the groupcast transmission occupying the second plurality of slots may occupy the same subchannel in a frequency domain, which will be discussed in detail with reference to FIG. 4.
  • the number of the first plurality of slots may be the same as the number of the second plurality of slots, and in this case, the groupcast transmission may occupy the same number of slots as the period of the PSFCH resources.
  • FIG. 4 illustrates another example resource pool configuration in accordance with aspects of the present disclosure.
  • the period of PSFCH resources is configured as 2 slots.
  • PSFCH resources associated with the groupcast transmission in slot 0 and PSFCH resources associated with the groupcast transmission in slot 1 are in the same PSFCH transmission occasion which is in slot 3.
  • the sidelink groupcast transmission with positive-negative acknowledgement may occupy transmission resources both in slot 0 and slot 1. It may not be allowed to perform the sidelink transmission only in slot 0 or slot 1.
  • the associated PSFCHs to be used may be determined based on both transmission resources occupied by the groupcast transmission in slot 0 and slot 1.
  • a group member in a situation where a group member misses the reception of an SCI in slot 0 or slot 1, it may fail to find out the correct candidate PSFCH resources when the subchannels occupied by the groupcast transmission in slot 0 and slot 1 are different.
  • a sidelink transmission occupies subchannel#0 in slot 0 and subchannel#2 in slot 1 respectively
  • the UE 104 may apply an OCC sequence within the dedicated interlace.
  • a PSFCH may occupy 1 interlace, and one interlace may have 10 or 11 PRBs (also referred to as interlace RBs (IRBs) ) .
  • PRBs also referred to as interlace RBs
  • RB level OCC in the frequency domain may be applied.
  • the length of the OCC sequence also referred to as occ-length
  • the OCC sequences w n (i) with the occ-length of 2 or 4 may be shown in the following tables.
  • the OCC sequence may be applied to a plurality of consecutive RBs within the dedicated interlace. If the number of RBs is not an integer multiple of the occ-length, there may be remaining one or more RBs, which are determined by excluding the plurality of consecutive RBs from the dedicated interlace. In other words, there may be remaining one or more RBs if the number of the remaining one or more RBs is smaller than the occ-length.
  • the OCC sequence may not be applied to the remaining one or more RBs. Accordingly, when performing the reception of the positive-negative acknowledgement, the UE 104 may perform no detection for the positive-negative acknowledgement on the remaining one or more RBs.
  • the OCC sequence may not be applied to these remaining RBs. Accordingly, at the receiving side of the PSFCH, i.e. the UE 104, it may not detect the remaining RBs since there may have interference among UEs without the OCC sequence applied.
  • the PSFCH resources may be indexed with the following order: frequency domain->cyclic shift->OCC.
  • the PSFCH resources may be indexed with the following order: frequency domain->OCC->cyclic shift.
  • whether to apply the OCC may depend on the number of group members and the number of candidate PSFCH resources. Since the group size may not be known to the group member, the UE 104 may indicate, to the group members, whether to apply the OCC sequence and/or the occ-length based on the group size and the number of candidate PSFCH resources.
  • the indication may be carried by an SCI, for example, the 1st-stage SCI or the 2nd-stage SCI.
  • two fields may be carried by the SCI, where 1 bit may be used to indicate whether to apply the OCC sequence and X bits may be used to indicate the occ-length. In this case, if only occ-length of 2 and 4 are supported, X may be 1.
  • one field may be carried by the SCI to indicate whether to apply the OCC sequence and the occ-length.
  • the occ-length may be (pre-) configured or pre-defined, and if not, the OCC sequence may not be applied.
  • 12-length sequence may be mapped to all 10 or 11 RBs within the dedicated interlace.
  • the phase rotations are shown in FIG. 6A. Since the length of the legacy sequence is 12, there are only 12 phase rotations to ensure orthogonality.
  • each group member may need two statuses to report Ack or NACK, so there is a maximum of 6 group members to be multiplexed in one same RB, as follows:
  • the UE 104 may increase the length of the sequence, and then map a long sequence for the PSFCH to a plurality of RBs (also referred to as a first plurality of RBs) within the dedicated interlace. In this manner, the long sequence may provide more statuses/phase rotations.
  • the long sequence may occupy a plurality of RBs (also referred to as a second plurality of RBs) .
  • the number of the second plurality of RBs may be pre-defined in the specification.
  • the number of the second plurality of RBs may be indicated in an SCI.
  • the UE 104 may determine the number of the second plurality of RBs considering the capacity of PSFCH resources and also the interference to make a tradeoff.
  • the number of the second plurality of RBs may be configured per resource pool.
  • the long sequence may occupy 2 RBs.
  • each group member may need two statuses to report Ack or NACK, so there is a maximum of 12 group members that may be multiplexed.
  • the long sequence mapping procedure if the number of RBs within the dedicated interlace is not an integer multiple of the number of the second plurality of RBs occupied by the long sequence, there may be remaining one or more RBs, which are determined by excluding, from the dedicated interlace, the first plurality of RBs to which the long sequence has been mapped. In other words, there may be remaining one or more RBs if the number of the remaining one or more RBs is smaller than the number of the second plurality of RBs. In this case, on the remaining one or more RBs, it may be up to UE implementation to determine what is transmitted. When performing the reception of the positive-negative acknowledgement, the UE 104 may perform no detection for the positive-negative acknowledgement on the remaining one or more RBs.
  • the long sequence may occupy M RBs, where M is not larger than the number of RBs within the dedicated interlace (e.g., 10 or 11 RBs. ) .
  • the TS 38.211 with long sequence extension may be modified as follows:
  • the long sequence mapping to M RBs may be repeated within the interlace floor (the number of RBs within interlace/M) .
  • the hopping may be done as m int .
  • the at least one resource pool may be configured with a PSFCH of structure Alt 1-1b where the PSFCH transmission occupies a common interlace and K3 dedicated PRB (s) .
  • the UE 104 may select, from one or more candidate resource pools configured with candidate PSFCH resources, a resource pool configured with a PSFCH occupying a common interlace and K3 dedicated PRB(s) (i.e., with structure Alt 1-1b) .
  • resource pools configured with a PSFCH of structure Alt 2-3a (where the PSFCH transmission occupies a dedicated interlace) may not be allowed for the groupcast transmission with positive-negative acknowledgement.
  • the at least one resource pool may be configured with a PSFCH of structure Alt 1-1b or a PSFCH of structure Alt 2-3a.
  • the UE 104 may select, from one or more candidate resource pools configured with candidate PSFCH resources, a resource pool configured with a PSFCH of structure Alt 1-1b.
  • whether a resource pool configured with a PSFCH of structure Alt 2-3a may be selected is determined based on the number of group members and the number of candidate PSFCH resources associated with the sidelink grant.
  • the UE 104 may select the resource pool with a PSFCH of structure Alt 2-3a if it determines that the number of candidate PSFCH resources associated with the sidelink grant is greater than or equal to the number of group members.
  • resource pool configuration with PSFCH structure Alt 1-1b and the related resource pool selection method may not rely on any other steps in FIGS. 2 to 6B.
  • the resource pool configuration with PSFCH structure Alt 1-1b and the related resource pool selection method may be embodied in independent embodiments.
  • the UE 104 may only select the resource pool with PSFCH structure Alt 1-1b to avoid capacity limitation issues.
  • FIG. 7 illustrates an example of a device 700 that supports PSFCH transmissions on an unlicensed spectrum in accordance with aspects of the present disclosure.
  • the device 700 may be an example of the UE 104 as described herein.
  • the device 700 may support wireless communication with one or more network entities 102, UEs 104, or any combination thereof.
  • the device 700 may include components for bi-directional communications including components for transmitting and receiving communications, such as a processor 702, a memory 704, a transceiver 706, and, optionally, an I/O controller 708. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses) .
  • the processor 702, the memory 704, the transceiver 706, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein.
  • the processor 702, the memory 704, the transceiver 706, or various combinations or components thereof may support a method for performing one or more of the operations described herein.
  • the processor 702, the memory 704, the transceiver 706, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry) .
  • the hardware may include a processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure.
  • the processor 702 and the memory 704 coupled with the processor 702 may be configured to perform one or more of the functions described herein (e.g., executing, by the processor 702, instructions stored in the memory 704) .
  • the processor 702 may support wireless communication at the device 700 in accordance with examples as disclosed herein.
  • the processor 702 may be configured to operable to support a means for determining a transmission resource for a groupcast transmission, based on a number of candidate PSFCH resources associated with the groupcast transmission and a number of group members communicating with the UE; a means for performing the groupcast transmission based on the transmission resource; and a means for receiving, from the group members, positive-negative acknowledgement for the groupcast transmission.
  • the processor 702 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) .
  • the processor 702 may be configured to operate a memory array using a memory controller.
  • a memory controller may be integrated into the processor 702.
  • the processor 702 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 704) to cause the device 700 to perform various functions of the present disclosure.
  • the memory 704 may include random access memory (RAM) and read-only memory (ROM) .
  • the memory 704 may store computer-readable, computer-executable code including instructions that, when executed by the processor 702 cause the device 700 to perform various functions described herein.
  • the code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory.
  • the code may not be directly executable by the processor 702 but may cause a computer (e.g., when compiled and executed) to perform functions described herein.
  • the memory 704 may include, among other things, a basic I/O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.
  • BIOS basic I/O system
  • the I/O controller 708 may manage input and output signals for the device 700.
  • the I/O controller 708 may also manage peripherals not integrated into the device M02.
  • the I/O controller 708 may represent a physical connection or port to an external peripheral.
  • the I/O controller 708 may utilize an operating system such as or another known operating system.
  • the I/O controller 708 may be implemented as part of a processor, such as the processor 706.
  • a user may interact with the device 700 via the I/O controller 708 or via hardware components controlled by the I/O controller 708.
  • the device 700 may include a single antenna 710. However, in some other implementations, the device 700 may have more than one antenna 710 (i.e., multiple antennas) , including multiple antenna panels or antenna arrays, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.
  • the transceiver 706 may communicate bi-directionally, via the one or more antennas 710, wired, or wireless links as described herein.
  • the transceiver 706 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver.
  • the transceiver 706 may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 710 for transmission, and to demodulate packets received from the one or more antennas 710.
  • the transceiver 706 may include one or more transmit chains, one or more receive chains, or a combination thereof.
  • a transmit chain may be configured to generate and transmit signals (e.g., control information, data, packets) .
  • the transmit chain may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium.
  • the at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM) , frequency modulation (FM) , or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (QAM) .
  • the transmit chain may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium.
  • the transmit chain may also include one or more antennas 710 for transmitting the amplified signal into the air or wireless medium.
  • a receive chain may be configured to receive signals (e.g., control information, data, packets) over a wireless medium.
  • the receive chain may include one or more antennas 710 for receiving the signal over the air or wireless medium.
  • the receive chain may include at least one amplifier (e.g., a low-noise amplifier (LNA) ) configured to amplify the received signal.
  • the receive chain may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal.
  • the receive chain may include at least one decoder for decoding the processing the demodulated signal to receive the transmitted data.
  • FIG. 8 illustrates an example of a processor 800 that supports PSFCH transmissions on an unlicensed spectrum in accordance with aspects of the present disclosure.
  • the processor 800 may be an example of a processor configured to perform various operations in accordance with examples as described herein.
  • the processor 800 may include a controller 802 configured to perform various operations in accordance with examples as described herein.
  • the processor 800 may optionally include at least one memory 804, such as L1/L2/L3 cache. Additionally, or alternatively, the processor 800 may optionally include one or more arithmetic-logic units (ALUs) 800.
  • ALUs arithmetic-logic units
  • the processor 800 may be a processor chipset and include a protocol stack (e.g., a software stack) executed by the processor chipset to perform various operations (e.g., receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) in accordance with examples as described herein.
  • a protocol stack e.g., a software stack
  • operations e.g., receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading
  • the processor chipset may include one or more cores, one or more caches (e.g., memory local to or included in the processor chipset (e.g., the processor 800) or other memory (e.g., random access memory (RAM) , read-only memory (ROM) , dynamic RAM (DRAM) , synchronous dynamic RAM (SDRAM) , static RAM (SRAM) , ferroelectric RAM (FeRAM) , magnetic RAM (MRAM) , resistive RAM (RRAM) , flash memory, phase change memory (PCM) , and others) .
  • RAM random access memory
  • ROM read-only memory
  • DRAM dynamic RAM
  • SDRAM synchronous dynamic RAM
  • SRAM static RAM
  • FeRAM ferroelectric RAM
  • MRAM magnetic RAM
  • RRAM resistive RAM
  • PCM phase change memory
  • the controller 802 may be configured to manage and coordinate various operations (e.g., signaling, receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) of the processor 800 to cause the processor 800 to support various operations of a base station in accordance with examples as described herein.
  • the controller 802 may operate as a control unit of the processor 800, generating control signals that manage the operation of various components of the processor 800. These control signals include enabling or disabling functional units, selecting data paths, initiating memory access, and coordinating timing of operations.
  • the controller 802 may be configured to fetch (e.g., obtain, retrieve, receive) instructions from the memory 804 and determine subsequent instruction (s) to be executed to cause the processor 800 to support various operations in accordance with examples as described herein.
  • the controller 802 may be configured to track memory address of instructions associated with the memory 804.
  • the controller 802 may be configured to decode instructions to determine the operation to be performed and the operands involved.
  • the controller 802 may be configured to interpret the instruction and determine control signals to be output to other components of the processor 800 to cause the processor 800 to support various operations in accordance with examples as described herein.
  • the controller 802 may be configured to manage flow of data within the processor 800.
  • the controller 802 may be configured to control transfer of data between registers, arithmetic logic units (ALUs) , and other functional units of the processor 800.
  • ALUs arithmetic logic units
  • the memory 804 may include one or more caches (e.g., memory local to or included in the processor 800 or other memory, such RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc. In some implementations, the memory 804 may reside within or on a processor chipset (e.g., local to the processor 800) . In some other implementations, the memory 804 may reside external to the processor chipset (e.g., remote to the processor 800) .
  • caches e.g., memory local to or included in the processor 800 or other memory, such RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc.
  • the memory 804 may reside within or on a processor chipset (e.g., local to the processor 800) . In some other implementations, the memory 804 may reside external to the processor chipset (e.g., remote to the processor 800) .
  • the memory 804 may store computer-readable, computer-executable code including instructions that, when executed by the processor 800, cause the processor 800 to perform various functions described herein.
  • the code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory.
  • the controller 802 and/or the processor 800 may be configured to execute computer-readable instructions stored in the memory 804 to cause the processor 800 to perform various functions.
  • the processor 800 and/or the controller 802 may be coupled with or to the memory 804, and the processor 800, the controller 802, and the memory 804 may be configured to perform various functions described herein.
  • the processor 800 may include multiple processors and the memory 804 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein.
  • the one or more ALUs 800 may be configured to support various operations in accordance with examples as described herein.
  • the one or more ALUs 800 may reside within or on a processor chipset (e.g., the processor 800) .
  • the one or more ALUs 800 may reside external to the processor chipset (e.g., the processor 800) .
  • One or more ALUs 800 may perform one or more computations such as addition, subtraction, multiplication, and division on data.
  • one or more ALUs 800 may receive input operands and an operation code, which determines an operation to be executed.
  • One or more ALUs 800 be configured with a variety of logical and arithmetic circuits, including adders, subtractors, shifters, and logic gates, to process and manipulate the data according to the operation. Additionally, or alternatively, the one or more ALUs 800 may support logical operations such as AND, OR, exclusive-OR (XOR) , not-OR (NOR) , and not-AND (NAND) , enabling the one or more ALUs 800 to handle conditional operations, comparisons, and bitwise operations.
  • logical operations such as AND, OR, exclusive-OR (XOR) , not-OR (NOR) , and not-AND (NAND) , enabling the one or more ALUs 800 to handle conditional operations, comparisons, and bitwise operations.
  • the processor 800 may support wireless communication in accordance with examples as disclosed herein.
  • the processor 800 may be configured to or operable to support a means for determining a transmission resource for a groupcast transmission, based on a number of candidate PSFCH resources associated with the groupcast transmission and a number of group members communicating with the UE; a means for performing the groupcast transmission based on the transmission resource; and a means for receiving, from the group members, positive-negative acknowledgement for the groupcast transmission.
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • the functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
  • Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer.
  • non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor.
  • an article “a” before an element is unrestricted and understood to refer to “at least one” of those elements or “one or more” of those elements.
  • the terms “a, ” “at least one, ” “one or more, ” and “at least one of one or more” may be interchangeable.
  • a list of items indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) .
  • the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure.
  • the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on.
  • a “set” may include one or more elements.

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Abstract

Des modes de réalisation de la présente divulgation concernent des transmissions par canal physique de retour de liaison latérale (PSFCH) sur un spectre sans licence. Dans certains modes de réalisation, un équipement utilisateur (UE) détermine une ressource de transmission pour une transmission de diffusion de groupe, sur la base d'un nombre de ressources de PSFCH candidates associées à la transmission de diffusion de groupe et d'un nombre d'éléments de groupe communiquant avec l'UE. Ensuite, l'UE effectue la transmission de diffusion de groupe sur la base de la ressource de transmission. De plus, l'UE reçoit, en provenance des éléments de groupe, un accusé de réception négatif/positif pour la transmission de diffusion de groupe. De cette manière, il est possible d'améliorer la capacité des ressources de PSFCH, et d'améliorer ainsi l'efficacité de transmission sur liaison latérale.
PCT/CN2023/110236 2023-07-31 2023-07-31 Transmissions par psfch sur un spectre sans licence Pending WO2024093399A1 (fr)

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CN110445586A (zh) * 2019-08-14 2019-11-12 展讯通信（上海）有限公司 反馈资源确定方法及装置
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