WO2022236686A1 - Présignalisation de collision dans des systèmes de communication sans fil - Google Patents

Présignalisation de collision dans des systèmes de communication sans fil Download PDF

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Publication number
WO2022236686A1
WO2022236686A1 PCT/CN2021/093079 CN2021093079W WO2022236686A1 WO 2022236686 A1 WO2022236686 A1 WO 2022236686A1 CN 2021093079 W CN2021093079 W CN 2021093079W WO 2022236686 A1 WO2022236686 A1 WO 2022236686A1
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WO
WIPO (PCT)
Prior art keywords
reservation
sidelink resource
transmission
resource
collision
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PCT/CN2021/093079
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English (en)
Inventor
Tien Viet NGUYEN
Gabi Sarkis
Sourjya Dutta
Hui Guo
Shuanshuan Wu
Kapil Gulati
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Qualcomm Incorporated
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Priority to PCT/CN2021/093079 priority Critical patent/WO2022236686A1/fr
Publication of WO2022236686A1 publication Critical patent/WO2022236686A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
    • H04W74/0816—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA carrier sensing with collision avoidance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management

Definitions

  • the technology discussed below relates generally to wireless communication systems, and more particularly, to facilitating pre-collision signaling in wireless communication systems.
  • Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be accessed by various types of devices configured to facilitate wireless communications, where multiple devices share the available system resources (e.g., time, frequency, and power) .
  • system resources e.g., time, frequency, and power
  • the third generation partnership project (3GPP) is an organization that develops and maintains telecommunication standards for fourth generation (4G) long-term evolution (LTE) networks.
  • 4G fourth generation
  • LTE long-term evolution
  • NR New Radio
  • 5G NR networks may exhibit a higher degree of flexibility and scalability than LTE, and are envisioned to support very diverse sets of requirements. Techniques applicable in such networks for facilitating pre-collision signaling may be desirable.
  • an apparatus for wireless communication may include a transceiver, a memory, and a processor communicatively coupled to the transceiver and the memory.
  • the processor and memory may be configured to receive a first reservation of a first sidelink resource from a first device, and receive a second reservation of a second sidelink resource from a second device.
  • the processor and memory may be further configured to send via the transceiver a pre-collision indicator to the second device to indicate that a second transmission on the second sidelink resource will collide with a first transmission on the first sidelink resource.
  • a method of wireless communication may include receiving a first reservation of a first sidelink resource from a first device, receiving a second reservation of a second sidelink resource from a second device, and transmitting a pre-collision indicator to the second device to indicate that a second transmission on the second sidelink resource will collide with a first transmission on the first sidelink resource.
  • a wireless communication device may include means for receiving a first reservation of a first sidelink resource from a first device, means for receiving a second reservation of a second sidelink resource from a second device, and means for transmitting a pre-collision indicator to the second device to indicate that a second transmission on the second sidelink resource will collide with a first transmission on the first sidelink resource.
  • Still additional examples may include a non-transitory processor-readable storage medium storing processor-executable instructions for causing a processing circuit to receive a first reservation of a first sidelink resource from a first device, receive a second reservation of a second sidelink resource from a second device, and send a pre-collision indicator to the second device to indicate that a second transmission on the second sidelink resource will collide with a first transmission on the first sidelink resource.
  • an apparatus for wireless communication may include a transceiver, a memory, and a processor communicatively coupled to the transceiver and the memory.
  • the processor and memory may be configured to send a reservation for a first transmission on a first sidelink resource, receive, via the transceiver, a pre-collision indicator indicating that the transmission on the first sidelink resource will collide with a second transmission by another device on a second sidelink resource, and transmit a self-reservation message to reserve a new sidelink resource to replace the first sidelink resource.
  • Additional example may include a method of wireless communication including sending a reservation for a first transmission on a first sidelink resource, receiving a pre-collision indicator indicating that the transmission on the first sidelink resource will collide with a second transmission by another device on a second sidelink resource; and transmitting a self-reservation message to reserve a new sidelink resource to replace the first sidelink resource.
  • a wireless communication device may include means for sending a reservation for a first transmission on a first sidelink resource, means for receiving a pre-collision indicator indicating that the transmission on the first sidelink resource will collide with a second transmission by another device on a second sidelink resource; and means for transmitting a self-reservation message to reserve a new sidelink resource to replace the first sidelink resource.
  • Still additional examples may include a non-transitory processor-readable storage medium storing processor-executable instructions for causing a processing circuit to send a reservation for a first transmission on a first sidelink resource, receive, via the transceiver, a pre-collision indicator indicating that the transmission on the first sidelink resource will collide with a second transmission by another device on a second sidelink resource, and transmit a self-reservation message to reserve a new sidelink resource to replace the first sidelink resource.
  • FIG. 1 is a conceptual diagram illustrating an example of a radio access network according to some examples.
  • FIG. 2 is a schematic diagram illustrating organization of wireless resources in an air interface utilizing orthogonal frequency divisional multiplexing (OFDM) according to some examples.
  • OFDM orthogonal frequency divisional multiplexing
  • FIG. 3 is a conceptual diagram illustrating an example of a wireless communication network configured to support device-to-device (D2D) or sidelink communication according to at least one example.
  • D2D device-to-device
  • FIG. 4A is a block diagram illustrating a sidelink slot structure according to at least one example.
  • FIG. 4B is a block diagram illustrating a sidelink slot structure according to at least one example.
  • FIG. 5 is a block diagram illustrating a sidelink slot structure with feedback resources according to some examples.
  • FIG. 6 is a block diagram illustrating an example of a collision on a sidelink resource.
  • FIG. 7 is a flow diagram illustrating sidelink communications between UEs according to at least one example of the present disclosure.
  • FIG. 8 is a block diagram conceptually illustrating an example of a hardware implementation for a UE according to some examples.
  • FIG. 9 is a flow diagram illustrating a wireless communication method according to some examples.
  • FIG. 10 is a block diagram conceptually illustrating an example of a hardware implementation for a UE according to some examples.
  • FIG. 11 is a flow diagram illustrating a wireless communication method according to some examples.
  • Implementations may range a spectrum from chip-level or modular components to non-modular, non-chip-level implementations and further to aggregate, distributed, or OEM devices or systems incorporating one or more aspects of the described innovations.
  • devices incorporating described aspects and features may also necessarily include additional components and features for implementation and practice of claimed and described examples.
  • transmission and reception of wireless signals necessarily includes a number of components for analog and digital purposes (e.g., hardware components including antenna, RF-chains, power amplifiers, modulators, buffer, processor (s) , interleaver, adders/summers, etc. ) .
  • innovations described herein may be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, end-user devices, etc. of varying sizes, shapes, and constitution.
  • the various concepts presented throughout this disclosure may be implemented across a broad variety of telecommunication systems, network architectures, and communication standards.
  • the RAN 100 may implement any suitable wireless communication technology or technologies to provide radio access.
  • the RAN 100 may operate according to 3 rd Generation Partnership Project (3GPP) New Radio (NR) specifications, often referred to as 5G.
  • 3GPP 3 rd Generation Partnership Project
  • NR New Radio
  • the RAN 100 may operate under a hybrid of 5G NR and Evolved Universal Terrestrial Radio Access Network (eUTRAN) standards, often referred to as LTE.
  • the 3GPP refers to this hybrid RAN as a next-generation RAN, or NG-RAN.
  • NG-RAN next-generation RAN
  • the geographic region covered by the radio access network 100 may be divided into a number of cellular regions (cells) that can be uniquely identified by a user equipment (UE) based on an identification broadcasted over a geographical area from one access point or base station.
  • FIG. 1 illustrates cells 102, 104, 106, and cell 108, each of which may include one or more sectors (not shown) .
  • a sector is a sub-area of a cell. All sectors within one cell are served by the same base station.
  • a radio link within a sector can be identified by a single logical identification belonging to that sector.
  • the multiple sectors within a cell can be formed by groups of antennas with each antenna responsible for communication with UEs in a portion of the cell.
  • a respective base station serves each cell.
  • a base station is a network element in a radio access network responsible for radio transmission and reception in one or more cells to or from a UE.
  • a BS may also be referred to by those skilled in the art as a base transceiver station (BTS) , a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS) , an extended service set (ESS) , an access point (AP) , a Node B (NB) , an eNode B (eNB) , a gNode B (gNB) , a transmission and reception point (TRP) , or some other suitable terminology.
  • BTS base transceiver station
  • eNB evolved Node B
  • gNB gNode B
  • TRP transmission and reception point
  • a base station may include two or more TRPs that may be collocated or non-collocated. Each TRP may communicate on the same or different carrier frequency within the same or different frequency band.
  • the RAN 100 operates according to both the LTE and 5G NR standards, one of the base stations may be an LTE base station, while another base station may be a 5G NR base station.
  • FIG. 1 two base stations 110 and 112 are shown in cells 102 and 104; and a third base station 114 is shown controlling a remote radio head (RRH) 116 in cell 106. That is, a base station can have an integrated antenna or can be connected to an antenna or RRH by feeder cables.
  • a base station can have an integrated antenna or can be connected to an antenna or RRH by feeder cables.
  • the cells 102, 104, and 106 may be referred to as macrocells, as the base stations 110, 112, and 114 support cells having a large size.
  • a base station 118 is shown in the cell 108 which may overlap with one or more macrocells.
  • the cell 108 may be referred to as a small cell (e.g., a microcell, picocell, femtocell, home base station, home Node B, home eNode B, etc. ) , as the base station 118 supports a cell having a relatively small size.
  • Cell sizing can be done according to system design as well as component constraints.
  • the radio access network 100 may include any number of wireless base stations and cells. Further, a relay node may be deployed to extend the size or coverage area of a given cell.
  • the base stations 110, 112, 114, 118 provide wireless access points to a core network for any number of mobile apparatuses.
  • FIG. 1 further includes an unmanned aerial vehicle (UAV) 120, which may be a drone or quadcopter.
  • UAV 120 may be configured to function as a base station, or more specifically as a mobile base station. That is, in some examples, a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile base station such as the UAV 120.
  • base stations may include a backhaul interface for communication with a backhaul portion (not shown) of the network.
  • the backhaul may provide a link between a base station and a core network (not shown) , and in some examples, the backhaul may provide interconnection between the respective base stations.
  • the core network may be a part of a wireless communication system and may be independent of the radio access technology used in the radio access network.
  • Various types of backhaul interfaces may be employed, such as a direct physical connection, a virtual network, or the like using any suitable transport network.
  • the RAN 100 is illustrated supporting wireless communication for multiple mobile apparatuses.
  • a mobile apparatus is commonly referred to as user equipment (UE) in standards and specifications promulgated by the 3rd Generation Partnership Project (3GPP) , but may also be referred to by those skilled in the art as a mobile station (MS) , a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal (AT) , a mobile terminal, a wireless terminal, a remote terminal, a handset, a terminal, a user agent, a mobile client, a client, or some other suitable terminology.
  • UE may be an apparatus that provides a user with access to network services.
  • a “mobile” apparatus need not necessarily have a capability to move, and may be stationary.
  • the term mobile apparatus or mobile device broadly refers to a diverse array of devices and technologies.
  • some non-limiting examples of a mobile apparatus include a mobile, a cellular (cell) phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal computer (PC) , a notebook, a netbook, a smartbook, a tablet, a personal digital assistant (PDA) , and a broad array of embedded systems, e.g., corresponding to an “Internet of things” (IoT) .
  • IoT Internet of things
  • a mobile apparatus may additionally be an automotive or other transportation vehicle, a remote sensor or actuator, a robot or robotics device, a satellite radio, a global positioning system (GPS) device, an object tracking device, a drone, a multi-copter, a quad-copter, a remote control device, a consumer and/or wearable device, such as eyewear, a wearable camera, a virtual reality device, a smart watch, a health or fitness tracker, a digital audio player (e.g., MP3 player) , a camera, a game console, etc.
  • GPS global positioning system
  • a mobile apparatus may additionally be a digital home or smart home device such as a home audio, video, and/or multimedia device, an appliance, a vending machine, intelligent lighting, a home security system, a smart meter, etc.
  • a mobile apparatus may additionally be a smart energy device, a security device, a solar panel or solar array, a municipal infrastructure device controlling electric power (e.g., a smart grid) , lighting, water, etc., an industrial automation and enterprise device, a logistics controller, agricultural equipment, etc.
  • a mobile apparatus may provide for connected medicine or telemedicine support, i.e., health care at a distance.
  • Telehealth devices may include telehealth monitoring devices and telehealth administration devices, whose communication may be given preferential treatment or prioritized access over other types of information, e.g., in terms of prioritized access for transport of critical service data, and/or relevant QoS for transport of critical service data.
  • the cells may include UEs that may be in communication with one or more sectors of each cell.
  • UEs 122 and 124 may be in communication with base station 110; UEs 126 and 128 may be in communication with base station 112; UEs 130 and 132 may be in communication with base station 114 by way of RRH 116; UE 134 may be in communication with base station 118; and UE 136 may be in communication with mobile base station 120.
  • each base station 110, 112, 114, 118, and 120 may be configured to provide an access point to a core network (not shown) for all the UEs in the respective cells.
  • the UAV 120 e.g., the quadcopter
  • the UAV 120 can be a mobile network node and may be configured to function as a UE.
  • the UAV 120 may operate within cell 102 by communicating with base station 110.
  • Wireless communication between a RAN 100 and a UE may be described as utilizing an air interface.
  • Transmissions over the air interface from a base station (e.g., base station 110) to one or more UEs (e.g., UE 122 and 124) may be referred to as downlink (DL) transmission.
  • DL downlink
  • the term downlink may refer to a point-to-multipoint transmission originating at a scheduling entity (described further below; e.g., base station 110) .
  • Another way to describe this scheme may be to use the term broadcast channel multiplexing.
  • Uplink Transmissions from a UE (e.g., UE 122) to a base station (e.g., base station 110) may be referred to as uplink (UL) transmissions.
  • UL uplink
  • the term uplink may refer to a point-to-point transmission originating at a scheduled entity (described further below; e.g., UE 122) .
  • DL transmissions may include unicast or broadcast transmissions of control information and/or traffic information (e.g., user data traffic) from a base station (e.g., base station 110) to one or more UEs (e.g., UEs 122 and 124)
  • UL transmissions may include transmissions of control information and/or traffic information originating at a UE (e.g., UE 122)
  • the uplink and/or downlink control information and/or traffic information may be time-divided into frames, subframes, slots, and/or symbols.
  • a symbol may refer to a unit of time that, in an orthogonal frequency division multiplexed (OFDM) waveform, carries one resource element (RE) per sub-carrier.
  • a slot may carry 7 or 14 OFDM symbols.
  • a subframe may refer to a duration of 1ms. Multiple subframes or slots may be grouped together to form a single frame or radio frame.
  • a frame may refer to a predetermined duration (e.g., 10 ms) for wireless transmissions, with each frame consisting of, for example, 10 subframes of 1 ms each.
  • a predetermined duration e.g. 10 ms
  • any suitable scheme for organizing waveforms may be utilized, and various time divisions of the waveform may have any suitable duration.
  • a scheduling entity e.g., a base station
  • resources e.g., time–frequency resources
  • the scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more scheduled entities. That is, for scheduled communication, UEs or scheduled entities utilize resources allocated by the scheduling entity.
  • Base stations are not the only entities that may function as a scheduling entity. That is, in some examples, a UE may function as a scheduling entity, scheduling resources for one or more scheduled entities (e.g., one or more other UEs) . For example, two or more UEs (e.g., UEs 138, 140, and 142) may communicate with each other using sidelink signals 137 without relaying that communication through a base station. In some examples, the UEs 138, 140, and 142 may each function as a scheduling entity or transmitting sidelink device and/or a scheduled entity or a receiving sidelink device to schedule resources and communicate sidelink signals 137 therebetween without relying on scheduling or control information from a base station.
  • two or more UEs within the coverage area of a base station (e.g., base station 112) may also communicate sidelink signals 127 over a direct link (sidelink) without conveying that communication through the base station 112.
  • the base station 112 may allocate resources to the UEs 126 and 128 for the sidelink communication.
  • sidelink signaling 127 and 137 may be implemented in a peer-to-peer (P2P) network, a device-to-device (D2D) network, a vehicle-to-vehicle (V2V) network, a vehicle-to-everything (V2X) network, a mesh network, or other suitable direct link network.
  • P2P peer-to-peer
  • D2D device-to-device
  • V2V vehicle-to-vehicle
  • V2X vehicle-to-everything
  • a D2D relay framework may be included within a cellular network to facilitate relaying of communication to/from the base station 112 via D2D links (e.g., sidelinks 127 or 137) .
  • D2D links e.g., sidelinks 127 or 137
  • one or more UEs e.g., UE 128) within the coverage area of the base station 112 may operate as relaying UEs to extend the coverage of the base station 112, improve the transmission reliability to one or more UEs (e.g., UE 126) , and/or to allow the base station to recover from a failed UE link due to, for example, blockage or fading.
  • V2X networks Two primary technologies that may be used by V2X networks include dedicated short range communication (DSRC) based on IEEE 802.11p standards and cellular V2X based on LTE and/or 5G (New Radio) standards.
  • DSRC dedicated short range communication
  • cellular V2X based on LTE and/or 5G (New Radio) standards.
  • NR New Radio
  • channel coding may be used. That is, wireless communication may generally utilize a suitable error correcting block code.
  • an information message or sequence is split up into code blocks (CBs) , and an encoder (e.g., a CODEC) at the transmitting device then mathematically adds redundancy to the information message. Exploitation of this redundancy in the encoded information message can improve the reliability of the message, enabling correction for any bit errors that may occur due to the noise.
  • Data coding may be implemented in multiple manners.
  • user data is coded using quasi-cyclic low-density parity check (LDPC) with two different base graphs: one base graph is used for large code blocks and/or high code rates, while the other base graph is used otherwise.
  • Control information and the physical broadcast channel (PBCH) are coded using Polar coding, based on nested sequences. For these channels, puncturing, shortening, and repetition are used for rate matching.
  • PBCH physical broadcast channel
  • aspects of the present disclosure may be implemented utilizing any suitable channel code.
  • Various implementations of base stations and UEs may include suitable hardware and capabilities (e.g., an encoder, a decoder, and/or a CODEC) to utilize one or more of these channel codes for wireless communication.
  • suitable hardware and capabilities e.g., an encoder, a decoder, and/or a CODEC
  • the ability for a UE to communicate while moving, independent of their location, is referred to as mobility.
  • the various physical channels between the UE and the RAN are generally set up, maintained, and released under the control of an access and mobility management function (AMF) .
  • AMF access and mobility management function
  • the AMF may include a security context management function (SCMF) and a security anchor function (SEAF) that performs authentication.
  • SCMF security context management function
  • SEAF security anchor function
  • the SCMF can manage, in whole or in part, the security context for both the control plane and the user plane functionality.
  • a RAN 100 may enable mobility and handovers (i.e., the transfer of a UE’s connection from one radio channel to another) .
  • a UE may monitor various parameters of the signal from its serving cell as well as various parameters of neighboring cells. Depending on the quality of these parameters, the UE may maintain communication with one or more of the neighboring cells. During this time, if the UE moves from one cell to another, or if signal quality from a neighboring cell exceeds that from the serving cell for a given amount of time, the UE may undertake a handoff or handover from the serving cell to the neighboring (target) cell.
  • target neighboring
  • UE 124 may move from the geographic area corresponding to its serving cell 102 to the geographic area corresponding to a neighbor cell 106.
  • the UE 124 may transmit a reporting message to its serving base station 110 indicating this condition.
  • the UE 124 may receive a handover command, and the UE may undergo a handover to the cell 106.
  • the air interface in the RAN 100 may utilize licensed spectrum, unlicensed spectrum, or shared spectrum.
  • Licensed spectrum provides for exclusive use of a portion of the spectrum, generally by virtue of a mobile network operator purchasing a license from a government regulatory body.
  • Unlicensed spectrum provides for shared use of a portion of the spectrum without need for a government-granted license. While compliance with some technical rules is generally still required to access unlicensed spectrum, generally, any operator or device may gain access.
  • Shared spectrum may fall between licensed and unlicensed spectrum, wherein technical rules or limitations may be required to access the spectrum, but the spectrum may still be shared by multiple operators and/or multiple RATs.
  • the holder of a license for a portion of licensed spectrum may provide licensed shared access (LSA) to share that spectrum with other parties, e.g., with suitable licensee-determined conditions to gain access.
  • LSA licensed shared access
  • the air interface in the RAN 100 may utilize one or more multiplexing and multiple access algorithms to enable simultaneous communication of the various devices.
  • 5G NR specifications provide multiple access for UL or reverse link transmissions from UEs 122 and 124 to base station 110, and for multiplexing DL or forward link transmissions from the base station 110 to UEs 122 and 124 utilizing orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) .
  • OFDM orthogonal frequency division multiplexing
  • CP cyclic prefix
  • 5G NR specifications provide support for discrete Fourier transform-spread-OFDM (DFT-s-OFDM) with a CP (also referred to as single-carrier FDMA (SC-FDMA) ) .
  • DFT-s-OFDM discrete Fourier transform-spread-OFDM
  • SC-FDMA single-carrier FDMA
  • multiplexing and multiple access are not limited to the above schemes, and may be provided utilizing time division multiple access (TDMA) , code division multiple access (CDMA) , frequency division multiple access (FDMA) , sparse code multiple access (SCMA) , resource spread multiple access (RSMA) , or other suitable multiple access schemes.
  • multiplexing DL transmissions from the base station 110 to UEs 122 and 124 may be provided utilizing time division multiplexing (TDM) , code division multiplexing (CDM) , frequency division multiplexing (FDM) , orthogonal frequency division multiplexing (OFDM) , sparse code multiplexing (SCM) , or other suitable multiplexing schemes.
  • the air interface in the RAN 100 may utilize one or more duplexing algorithms.
  • Duplex refers to a point-to-point communication link where both endpoints can communicate with one another in both directions.
  • Full-duplex means both endpoints can simultaneously communicate with one another.
  • Half-duplex means only one endpoint can send information to the other at a time.
  • Half-duplex emulation is frequently implemented for wireless links utilizing time division duplex (TDD) .
  • TDD time division duplex
  • transmissions in different directions on a given channel are separated from one another using time division multiplexing. That is, at some times the channel is dedicated for transmissions in one direction, while at other times the channel is dedicated for transmissions in the other direction, where the direction may change very rapidly, e.g., several times per slot.
  • a full-duplex channel In a wireless link, a full-duplex channel generally relies on physical isolation of a transmitter and receiver, and suitable interference cancellation technologies.
  • Full-duplex emulation is frequently implemented for wireless links by utilizing frequency division duplex (FDD) or spatial division duplex (SDD) .
  • FDD frequency division duplex
  • SDD spatial division duplex
  • transmissions in different directions may operate at different carrier frequencies (e.g., within paired spectrum) .
  • SDD transmissions in different directions on a given channel are separated from one another using spatial division multiplexing (SDM) .
  • full-duplex communication may be implemented within unpaired spectrum (e.g., within a single carrier bandwidth) , where transmissions in different directions occur within different sub-bands of the carrier bandwidth. This type of full-duplex communication may be referred to herein as sub-band full duplex (SBFD) , also known as flexible duplex.
  • SBFD sub-band full duplex
  • FIG. 2 an expanded view of an exemplary subframe 202 is illustrated, showing an OFDM resource grid.
  • time is in the horizontal direction with units of OFDM symbols; and frequency is in the vertical direction with units of subcarriers of the carrier.
  • the resource grid 204 may be used to schematically represent time–frequency resources for a given antenna port. That is, in a multiple-input-multiple-output (MIMO) implementation with multiple antenna ports available, a corresponding multiple number of resource grids 204 may be available for communication.
  • the resource grid 204 is divided into multiple resource elements (REs) 206.
  • An RE which is 1 subcarrier ⁇ 1 symbol, is the smallest discrete part of the time–frequency grid, and contains a single complex value representing data from a physical channel or signal.
  • each RE may represent one or more bits of information.
  • a block of REs may be referred to as a physical resource block (PRB) or more simply a resource block (RB) 208, which contains any suitable number of consecutive subcarriers in the frequency domain.
  • an RB may include 12 subcarriers, a number independent of the numerology used.
  • an RB may include any suitable number of consecutive OFDM symbols in the time domain.
  • a set of continuous or discontinuous resource blocks may be referred to herein as a Resource Block Group (RBG) , sub-band, or bandwidth part (BWP) .
  • RBG Resource Block Group
  • BWP bandwidth part
  • a set of sub-bands or BWPs may span the entire bandwidth.
  • Scheduling of UEs or sidelink devices (hereinafter collectively referred to as UEs) for downlink, uplink, or sidelink transmissions typically involves scheduling one or more resource elements 206 within one or more sub-bands or bandwidth parts (BWPs) .
  • a UE generally utilizes only a subset of the resource grid 204.
  • an RB may be the smallest unit of resources that can be allocated to a UE.
  • the RBs may be scheduled by a base station (e.g., gNB, eNB, etc. ) or may be self-scheduled by a UE/sidelink device implementing D2D sidelink communication.
  • a base station e.g., gNB, eNB, etc.
  • the RB 208 is shown as occupying less than the entire bandwidth of the subframe 202, with some subcarriers illustrated above and below the RB 208.
  • the subframe 202 may have a bandwidth corresponding to any number of one or more RBs 208.
  • the RB 208 is shown as occupying less than the entire duration of the subframe 202, although this is merely one possible example.
  • Each 1 ms subframe 202 may consist of one or multiple adjacent slots.
  • one subframe 202 includes four slots 210, as an illustrative example.
  • a slot may be defined according to a specified number of OFDM symbols with a given cyclic prefix (CP) length.
  • CP cyclic prefix
  • a slot may include 7 or 12 OFDM symbols with a nominal CP.
  • Additional examples may include mini-slots, sometimes referred to as shortened transmission time intervals (TTIs) , having a shorter duration (e.g., one to three OFDM symbols) .
  • TTIs shortened transmission time intervals
  • These mini-slots or shortened transmission time intervals (TTIs) may in some cases be transmitted occupying resources scheduled for ongoing slot transmissions for the same or for different UEs. Any number of resource blocks may be utilized within a subframe or slot.
  • An expanded view of one of the slots 210 illustrates the slot 210 including a control region 212 and a data region 214.
  • the control region 212 may carry control channels
  • the data region 214 may carry data channels.
  • a slot may contain all DL, all UL, or at least one DL portion and at least one UL portion.
  • the structure illustrated in FIG. 2 is merely exemplary in nature, and different slot structures may be utilized, and may include one or more of each of the control region (s) and data region (s) .
  • the various REs 206 within a RB 208 may be scheduled to carry one or more physical channels, including control channels, shared channels, data channels, etc.
  • Other REs 206 within the RB 208 may also carry pilots or reference signals. These pilots or reference signals may provide for a receiving device to perform channel estimation of the corresponding channel, which may enable coherent demodulation/detection of the control and/or data channels within the RB 208.
  • the slot 210 may be utilized for broadcast, multicast, groupcast, or unicast communication.
  • a broadcast, multicast, or groupcast communication may refer to a point-to-multipoint transmission by one device (e.g., a base station, UE, or other similar device) to other devices.
  • a broadcast communication is delivered to all devices, whereas a multicast or groupcast communication is delivered to multiple intended recipient devices.
  • a unicast communication may refer to a point-to-point transmission by a one device to a single other device.
  • the scheduling entity may allocate one or more REs 206 (e.g., within the control region 212) to carry DL control information including one or more DL control channels, such as a physical downlink control channel (PDCCH) , to one or more scheduled entities (e.g., UEs) .
  • the PDCCH carries downlink control information (DCI) including but not limited to power control commands (e.g., one or more open loop power control parameters and/or one or more closed loop power control parameters) , scheduling information, a grant, and/or an assignment of REs for DL and UL transmissions.
  • DCI downlink control information
  • the PDCCH may further carry HARQ feedback transmissions such as an acknowledgment (ACK) or negative acknowledgment (NACK) .
  • HARQ is a technique well-known to those of ordinary skill in the art, wherein the integrity of packet transmissions may be checked at the receiving side for accuracy, e.g., utilizing any suitable integrity checking mechanism, such as a checksum or a cyclic redundancy check (CRC) . If the integrity of the transmission is confirmed, an ACK may be transmitted, whereas if not confirmed, a NACK may be transmitted. In response to a NACK, the transmitting device may send a HARQ retransmission, which may implement chase combining, incremental redundancy, etc.
  • the base station may further allocate one or more REs 206 (e.g., in the control region 212 or the data region 214) to carry other DL signals, such as a demodulation reference signal (DMRS) ; a phase-tracking reference signal (PT-RS) ; a channel state information (CSI) reference signal (CSI-RS) ; and a synchronization signal block (SSB) .
  • SSBs may be broadcast at regular intervals based on a periodicity (e.g., 5, 10, 20, 40, 80, or 160 ms) .
  • An SSB includes a primary synchronization signal (PSS) , a secondary synchronization signal (SSS) , and a physical broadcast control channel (PBCH) .
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • PBCH physical broadcast control channel
  • a UE may utilize the PSS and SSS to achieve radio frame, subframe, slot, and symbol synchronization in the time domain, identify the center of the channel (system
  • the PBCH in the SSB may further include a master information block (MIB) that includes various system information, along with parameters for decoding a system information block (SIB) .
  • the SIB may be, for example, a SystemInformationType 1 (SIB1) that may include various additional system information.
  • SIB and SIB1 together provide the minimum system information (SI) for initial access.
  • Examples of system information transmitted in the MIB may include, but are not limited to, a subcarrier spacing (e.g., default downlink numerology) , system frame number, a configuration of a PDCCH control resource set (CORESET) (e.g., PDCCH CORESET0) , a cell barred indicator, a cell reselection indicator, a raster offset, and a search space for SIB1.
  • Examples of remaining minimum system information (RMSI) transmitted in the SIB1 may include, but are not limited to, a random access search space, a paging search space, downlink configuration information, and uplink configuration information.
  • the scheduled entity may utilize one or more REs 206 to carry UL control information (UCI) including one or more UL control channels, such as a physical uplink control channel (PUCCH) , to the scheduling entity.
  • UCI may include a variety of packet types and categories, including pilots, reference signals, and information configured to enable or assist in decoding uplink data transmissions.
  • uplink reference signals may include a sounding reference signal (SRS) and an uplink DMRS.
  • the UCI may include a scheduling request (SR) , i.e., request for the scheduling entity to schedule uplink transmissions.
  • SR scheduling request
  • the scheduling entity may transmit downlink control information (DCI) that may schedule resources for uplink packet transmissions.
  • DCI may also include HARQ feedback, channel state feedback (CSF) , such as a CSI report, or any other suitable UCI.
  • CSF channel state feedback
  • one or more REs 206 may be allocated for data traffic. Such data traffic may be carried on one or more traffic channels, such as, for a DL transmission, a physical downlink shared channel (PDSCH) ; or for an UL transmission, a physical uplink shared channel (PUSCH) .
  • PDSCH physical downlink shared channel
  • PUSCH physical uplink shared channel
  • one or more REs 206 within the data region 214 may be configured to carry other signals, such as one or more SIBs and DMRSs.
  • the control region 212 of the slot 210 may include a physical sidelink control channel (PSCCH) including sidelink control information (SCI) transmitted by an initiating (transmitting) sidelink device (e.g., Tx V2X device or other Tx UE) towards a set of one or more other receiving sidelink devices (e.g., Rx V2X device or other Rx UE) .
  • the data region 214 of the slot 210 may include a physical sidelink shared channel (PSSCH) including sidelink data traffic transmitted by the initiating (transmitting) sidelink device within resources reserved over the sidelink carrier by the transmitting sidelink device via the SCI.
  • PSSCH physical sidelink shared channel
  • HARQ feedback information may be transmitted in a physical sidelink feedback channel (PSFCH) within the slot 210 from the receiving sidelink device to the transmitting sidelink device.
  • PSFCH physical sidelink feedback channel
  • one or more reference signals such as a sidelink SSB, a sidelink CSI-RS, a sidelink SRS, and/or a sidelink positioning reference signal (PRS) may be transmitted within the slot 210.
  • PRS sidelink positioning reference signal
  • Transport channels carry blocks of information called transport blocks (TB) .
  • TBS transport block size
  • MCS modulation and coding scheme
  • the channels or carriers illustrated in FIG. 2 are not necessarily all of the channels or carriers that may be utilized between devices, and those of ordinary skill in the art will recognize that other channels or carriers may be utilized in addition to those illustrated, such as other traffic, control, and feedback channels.
  • FIG. 3 illustrates an example of a wireless communication network 300 configured to support D2D or sidelink communication.
  • sidelink communication may include V2X communication.
  • V2X communication involves the wireless exchange of information directly between not only vehicles (e.g., vehicles 302 and 304) themselves, but also directly between vehicles 302/304 and infrastructure (e.g., roadside units (RSUs) 306) , such as streetlights, buildings, traffic cameras, tollbooths or other stationary objects, vehicles 302/304 and pedestrians 308, and vehicles 302/304 and wireless communication networks (e.g., base station 310) .
  • V2X communication may be implemented in accordance with the New Radio (NR) cellular V2X standard defined by 3GPP, Release 16, or other suitable standard.
  • NR New Radio
  • V2X communication enables vehicles 302 and 304 to obtain information related to the weather, nearby accidents, road conditions, activities of nearby vehicles and pedestrians, objects nearby the vehicle, and other pertinent information that may be utilized to improve the vehicle driving experience and increase vehicle safety.
  • V2X data may enable autonomous driving and improve road safety and traffic efficiency.
  • the exchanged V2X data may be utilized by a V2X connected vehicle 302 and 304 to provide in-vehicle collision warnings, road hazard warnings, approaching emergency vehicle warnings, pre-/post-crash warnings and information, emergency brake warnings, traffic jam ahead warnings, lane change warnings, intelligent navigation services, and other similar information.
  • V2X data received by a V2X connected mobile device of a pedestrian/cyclist 308 may be utilized to trigger a warning sound, vibration, flashing light, etc., in case of imminent danger.
  • the sidelink communication between vehicle-UEs (V-UEs) 302 and 304 or between a V-UE 302 or 304 and either an RSU 306 or a pedestrian-UE (P-UE) 308 may occur over a sidelink 312 utilizing a proximity service (ProSe) PC5 interface.
  • the PC5 interface may further be utilized to support D2D sidelink 312 communication in other proximity use cases (e.g., other than V2X) .
  • Examples of other proximity use cases may include smart wearables, public safety, or commercial (e.g., entertainment, education, office, medical, and/or interactive) based proximity services.
  • ProSe communication may further occur between UEs 314 and 316.
  • ProSe communication may support different operational scenarios, such as in-coverage, out-of-coverage, and partial coverage.
  • Out-of-coverage refers to a scenario in which UEs (e.g., UEs 314 and 316) are outside of the coverage area of a base station (e.g., base station 310) , but each are still configured for ProSe communication.
  • Partial coverage refers to a scenario in which some of the UEs (e.g., V-UE 304) are outside of the coverage area of the base station 310, while other UEs (e.g., V-UE 302 and P-UE 308) are in communication with the base station 310.
  • In-coverage refers to a scenario in which UEs (e.g., V-UE 302 and P-UE 308) are in communication with the base station 310 (e.g., gNB) via a Uu (e.g., cellular interface) connection to receive ProSe service authorization and provisioning information to support ProSe operations.
  • UEs e.g., V-UE 302 and P-UE 308
  • the base station 310 e.g., gNB
  • Uu e.g., cellular interface
  • each discovery signal may include a synchronization signal, such as a primary synchronization signal (PSS) and/or a secondary synchronization signal (SSS) that facilitates device discovery and enables synchronization of communication on the sidelink 312.
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • the discovery signal may be utilized by the UE 316 to measure the signal strength and channel status of a potential sidelink (e.g., sidelink 312) with another UE (e.g., UE 314) .
  • the UE 316 may utilize the measurement results to select a UE (e.g., UE 314) for sidelink communication or relay communication.
  • sidelink communication may utilize transmission or reception resource pools.
  • the minimum resource allocation unit in frequency may be a sub-channel (e.g., which may include, for example, 10, 15, 20, 25, 50, 75, or 100 consecutive resource blocks) and the minimum resource allocation unit in time may be one slot.
  • a radio resource control (RRC) configuration of the resource pools may be either pre-configured (e.g., a factory setting on the UE determined, for example, by sidelink standards or specifications) or configured by a base station (e.g., base station 310) .
  • a base station (e.g., gNB) 310 may allocate resources to sidelink devices (e.g., V2X devices or other sidelink devices) for sidelink communication between the sidelink devices in various manners. For example, the base station 310 may allocate sidelink resources dynamically (e.g., a dynamic grant) to sidelink devices, in response to requests for sidelink resources from the sidelink devices. The base station 310 may further activate preconfigured sidelink grants (e.g., configured grants) for sidelink communication among the sidelink devices.
  • sidelink feedback may be reported back to the base station 310 by a transmitting sidelink device.
  • the sidelink devices may autonomously select sidelink resources for sidelink communication therebetween.
  • a transmitting sidelink device may perform resource/channel sensing to select resources (e.g., sub-channels) on the sidelink channel that are unoccupied. Signaling on the sidelink is the same between the two modes. Therefore, from a receiver’s point of view, there is no difference between the modes.
  • sidelink (e.g., PC5) communication may be scheduled by use of sidelink control information (SCI) .
  • SCI may include two SCI stages. Stage 1 sidelink control information (first stage SCI) may be referred to herein as SCI-1. Stage 2 sidelink control information (second stage SCI) may be referred to herein as SCI-2.
  • SCI-1 may be transmitted on a physical sidelink control channel (PSCCH) .
  • SCI-1 may include information for resource allocation of a sidelink resource and for decoding of the second stage of sidelink control information (i.e., SCI-2) .
  • SCI-1 may further identify a priority level (e.g., Quality of Service (QoS) ) of a PSSCH.
  • QoS Quality of Service
  • URLLC ultra-reliable-low-latency communication
  • SMS short message service
  • SCI-1 may also include a physical sidelink shared channel (PSSCH) resource assignment and a resource reservation period (if enabled) .
  • PSSCH physical sidelink shared channel
  • SCI-1 may include a PSSCH demodulation reference signal (DMRS) pattern (if more than one pattern is configured) .
  • the DMRS may be used by a receiver for radio channel estimation for demodulation of the associated physical channel.
  • SCI-1 may also include information about the SCI-2, for example, SCI-1 may disclose the format of the SCI-2.
  • the format indicates the resource size of SCI-2 (e.g., a number of REs that are allotted for SCI-2) , a number of a PSSCH DMRS port (s) , and a modulation and coding scheme (MCS) index.
  • MCS modulation and coding scheme
  • SCI-1 may use two bits to indicate the SCI-2 format.
  • four different SCI-2 formats may be supported.
  • SCI-1 may include other information that is useful for establishing and decoding a PSSCH resource.
  • SCI-2 may also be transmitted on the PSCCH and may contain information for decoding the PSSCH.
  • SCI-2 includes a 16-bit layer 1 (L1) destination identifier (ID) , an 8-bit L1 source ID, a hybrid automatic repeat request (HARQ) process ID, a new data indicator (NDI) , and a redundancy version (RV) .
  • L1 layer 1
  • HARQ hybrid automatic repeat request
  • NDI new data indicator
  • RV redundancy version
  • SCI-2 may further include a CSI report trigger.
  • SCI-2 may further include a zone identifier and a maximum communication range for NACK.
  • SCI-2 may include other information that is useful for establishing and decoding a PSSCH resource.
  • FIGS. 4A and 4B are diagrams illustrating examples of sidelink slot structures according to some aspects.
  • the sidelink slot structures may be utilized, for example, in a V2X or other D2D network implementing sidelink.
  • time is in the horizontal direction with units of symbols 402 (e.g., OFDM symbols) ; and frequency is in the vertical direction.
  • a carrier bandwidth 404 allocated for sidelink wireless communication is illustrated along the frequency axis.
  • the carrier bandwidth 404 may include a plurality of sub-channels, where each sub-channel may include a configurable number of PRBs (e.g., 10, 14, 20, 24, 40, 44, or 100 PRBs) .
  • FIGS. 4A and 4B illustrate an example of a respective slot 400a or 400b including fourteen symbols 402 that may be used for sidelink communication.
  • sidelink communication can be configured to occupy fewer than fourteen symbols in a slot 400a or 400b, and the disclosure is not limited to any particular number of symbols 402.
  • Each sidelink slot 400a and 400b includes a physical sidelink control channel (PSCCH) 406 occupying a control region 418 of the slot 400a and 400b and a physical sidelink shared channel (PSSCH) 408 occupying a data region 420 of the slot 400a and 400b.
  • PSCCH 406 and PSSCH 408 are each transmitted on one or more symbols 402 of the slot 400a.
  • the PSCCH 406 includes, for example, SCI-1 that schedules transmission of data traffic on time–frequency resources of the corresponding PSSCH 408. As shown in FIGS. 4A and 4B, the PSCCH 406 and corresponding PSSCH 408 are transmitted in the same slot 400a and 400b. In other examples, the PSCCH 406 may schedule a PSSCH in a subsequent slot.
  • the PSCCH 406 duration is configured to be two or three symbols.
  • the PSCCH 406 may be configured to span a configurable number of PRBs, limited to a single sub-channel. For example, the PSCCH 406 may span 10, 12, 14, 20, or 24 PRBs of a single sub-channel.
  • a DMRS may further be present in every PSCCH symbol. In some examples, the DMRS may be placed on every fourth RE of the PSCCH 406.
  • a frequency domain orthogonal cover code (FD-OCC) may further be applied to the PSCCH DMRS to reduce the impact of colliding PSCCH transmissions on the sidelink channel.
  • FD-OCC frequency domain orthogonal cover code
  • a transmitting UE may randomly select the FD-OCC from a set of pre-defined FD-OCCs.
  • the starting symbol for the PSCCH 406 is the second symbol of the corresponding slot 400a or 400b and the PSCCH 406 spans three symbols 402.
  • the PSSCH 408 may be time-division multiplexed (TDMed) with the PSCCH 406 and/or frequency-division multiplexed (FDMed) with the PSCCH 406.
  • TDMed time-division multiplexed
  • FDMed frequency-division multiplexed
  • the PSSCH 408 includes a first portion 408a that is TDMed with the PSCCH 406 and a second portion 408b that is FDMed with the PSCCH 406.
  • the PSSCH 408 is TDMed with the PSCCH 406.
  • One and two layer transmissions of the PSSCH 408 may be supported with various modulation orders (e.g., QPSK, 16-QAM, 64-QAM and 246-QAM) .
  • the PSSCH 408 may include DMRSs 414 configured in a two, three, or four symbol DMRS pattern.
  • slot 400a shown in FIG. 4A illustrates a two symbol DMRS pattern
  • slot 400b shown in FIG. 4B illustrates a three symbol DMRS pattern.
  • the transmitting UE can select the DMRS pattern and indicate the selected DMRS pattern in SCI-1, according to channel conditions.
  • the DMRS pattern may be selected, for example, based on the number of PSSCH 408 symbols in the slot 400a or 400b.
  • a gap symbol 416 is present after the PSSCH 408 in each slot 400a and 400b.
  • Each slot 400a and 400b further includes SCI-2 412 mapped to contiguous RBs in the PSSCH 408 starting from the first symbol containing a PSSCH DMRS.
  • the first symbol containing a PSSCH DMRS is the fifth symbol occurring immediately after the last symbol carrying the PSCCH 406. Therefore, the SCI-2 412 is mapped to RBs within the fifth symbol.
  • the first symbol containing a PSSCH DMRS is the second symbol, which also includes the PSCCH 406.
  • the SCI-2/PSSCH DMRS 412 are shown spanning symbols two through five. As a result, the SCI-2/PSSCH DMRS 412 may be FDMed with the PSCCH 406 in symbols two through four and TDMed with the PSCCH 406 in symbol five.
  • the SCI-2 may be scrambled separately from the sidelink shared channel.
  • the SCI-2 may utilize QPSK.
  • the SCI-2 modulation symbols may be copied on (e.g., repeated on) both layers.
  • the SCI-1 in the PSCCH 406 may be blind decoded at the receiving wireless communication device. However, since the format, starting location, and number of REs of the SCI-2 412 may be derived from the SCI-1, blind decoding of SCI-2 is not needed at the receiver (receiving UE) .
  • the second symbol of each slot 400a and 400b is copied onto (repeated on) a first symbol 410 thereof for automatic gain control (AGC) settling.
  • AGC automatic gain control
  • the second symbol containing the PSCCH 406 FDMed with the PSSCH 408b may be transmitted on both the first symbol and the second symbol.
  • the second symbol containing the PSCCH 406 FDMed with the SCI-2/PSSCH DMRS 412 may be transmitted on both the first symbol and the second symbol.
  • FIG. 5 is a diagram illustrating an example of a sidelink slot structure with feedback resources according to some aspects.
  • the sidelink slot structure may be utilized, for example, in a V2X or other D2D network implementing sidelink.
  • time is in the horizontal direction with units of symbols 502 (e.g., OFDM symbols) ; and frequency is in the vertical direction.
  • symbols 502 e.g., OFDM symbols
  • frequency is in the vertical direction.
  • a carrier bandwidth 504 allocated for sidelink wireless communication is illustrated along the frequency axis.
  • a slot 500 having the slot structure shown in FIG. 5 includes fourteen symbols 502 that may be used for sidelink communication.
  • sidelink communication can be configured to occupy fewer than fourteen symbols in a slot 500, and the disclosure is not limited to any particular number of symbols 502.
  • the sidelink slot 500 includes a PSCCH 506 occupying a control region of the slot 500 and a PSSCH 508 occupying a data region 520 of the slot 500.
  • the PSCCH 506 and PSSCH 508 are each transmitted on one or more symbols 502 of the slot 500a.
  • the PSCCH 506 includes, for example, SCI-1 that schedules transmission of data traffic on time–frequency resources of the corresponding PSSCH 508.
  • the starting symbol for the PSCCH 506 is the second symbol of the slot 500 and the PSCCH 506 spans three symbols 502.
  • the PSSCH 508 may be time-division multiplexed (TDMed) with the PSCCH 506 and/or frequency-division multiplexed (FDMed) with the PSCCH 506.
  • TDMed time-division multiplexed
  • FDMed frequency-division multiplexed
  • the PSSCH 508 includes a first portion 508a that is TDMed with the PSCCH 506 and a second portion 508b that is FDMed with the PSCCH 506.
  • the PSSCH 508 may further include a DMRSs 514 configured in a two, three, or four symbol DMRS pattern.
  • slot 500 shown in FIG. 5 illustrates a two symbol DMRS pattern.
  • the transmitting UE can select the DMRS pattern and indicate the selected DMRS pattern in SCI-1, according to channel conditions.
  • the DMRS pattern may be selected, for example, based on the number of PSSCH 508 symbols in the slot 500.
  • a gap symbol 516 is present after the PSSCH 508 in the slot 500.
  • the slot 500 further includes SCI-2 512 mapped to contiguous RBs in the PSSCH 508 starting from the first symbol containing a PSSCH DMRS.
  • the first symbol containing a PSSCH DMRS is the fifth symbol occurring immediately after the last symbol carrying the PSCCH 506. Therefore, the SCI-2 512 is mapped to RBs within the fifth symbol.
  • the second symbol of the slot 500 is copied onto (repeated on) a first symbol 510 thereof for automatic gain control (AGC) settling.
  • AGC automatic gain control
  • the second symbol containing the PSCCH 506 FDMed with the PSSCH 508b may be transmitted on both the first symbol and the second symbol.
  • HARQ feedback may further be transmitted on a physical sidelink feedback channel (PSFCH) 518 in a configurable resource period of 0, 1, 2, or 4 slots.
  • PSFCH physical sidelink feedback channel
  • one symbol 502 may be allocated to the PSFCH 518, and the PSFCH 518 may be copied onto (repeated on) a previous symbol for AGC settling.
  • the PSFCH 518 is transmitted on the thirteenth symbol and copied onto the twelfth symbol in the slot 500c.
  • a gap symbol 516 may further be placed after the PSFCH symbols 518.
  • the PSSCH 508 there is a mapping between the PSSCH 508 and the corresponding PSFCH resource.
  • the mapping may be based on, for example, the starting sub-channel of the PSSCH 508, the slot containing the PSSCH 508, the source ID and the destination ID.
  • the PSFCH can be enabled for unicast and groupcast communication.
  • the PSFCH may include one ACK/NACK bit.
  • groupcast there may be two feedback modes for the PSFCH. In a first groupcast PSFCH mode, the receiving UE transmits only NACK, whereas in a second groupcast PSFCH mode, the receiving UE may transmit either ACK or NACK.
  • the number of available PSFCH resources may be equal to or greater than the number of UEs in the second groupcast PSFCH mode.
  • resource conflict indications may include pre-collision indications and post-collision indications.
  • a pre-collision indication facilitates collision avoidance, while post-collision indication facilitate retransmission after a collision has occurred.
  • FIG. 6 includes a block diagram of sidelink resources and UE transmissions.
  • a first UE, UE 0 may reserve a resource 602 for a transmission by UE 0 .
  • a second UE, UE 1 may also reserve the same resource 602.
  • a third UE may detect the imminent collision between the two UEs, and may send a transmission including a pre-collision indicator.
  • the UE 1 is shown in this example as changing at 606 to a different resource to avoid the collision.
  • Various aspects of the present disclosure include pre-collision detection, pre-collision indicator signaling, and/or actions taken in response to a pre-collision indicator.
  • a flow diagram is shown illustrating an example of sidelink communications between UEs facilitating pre-collision detection and avoidance according to one or more aspects of the present disclosure.
  • communications occur between UE1 702, UE2 704, and UE3 706.
  • UE1 702 may transmit a reservation 708 for a resource A.
  • the UE2 704 also transmits a reservation 710 for a resource B, where the resource B overlaps at least a part of resource A.
  • the reservation 710 may be for a resource that overlaps at least a part of resource A in time, or in both time and frequency.
  • the UE1 702 and the UE2 704 may ensure a gap of time between the reservation signal and the reserved resource to ensure sufficient time to receive a pre-collision indicator.
  • This gap of time is typically achieved automatically of the reservation for resource A or B is a feedback based retransmission if pre-collision warning time is similar to the feedback time. Otherwise, the minimum gap can be defined as the number of slots between the reservation transmission and the pre-collision indicator time, in addition to the UE processing time (e.g., the time for receiving the warning, reselecting resources, re-encoding messages, etc. ) .
  • the UE3 706 may detect the collision 712 between resource A and resource B. In some implementations, the UE3 706 may detect the collision by receiving the reservation from UE2 after receiving the reservation from UE1 702. In some implementations, the UE3 706 may detect the collision by identifying that the reservation for resource A and the reservation for resource B both point to resources in the future that overlap in time or time and frequency. In some implementations the UE3 706 may detect the collision when the UE3 706 is configured to receive from at least one of the UE1 702 or UE2 704.
  • the UE3 706 may detect the collision based on a signal to interference ratio (SIR) using the calculation S/I, where ‘S’ is the measured reference signal received power (RSRP) on reservation A and ‘I’ is the measured RSRP on reservation B.
  • SIR signal to interference ratio
  • RSRP reference signal received power
  • a collision may be detected when SIR is lower than a second threshold T2 and when resource A and resource B overlap in time.
  • the second threshold T2 may be substantially lower than the first threshold T1.
  • a collision may be detected with SIR is higher than a third threshold T3 and when resource A and resource B overlap in time and frequency.
  • a collision may be detected when SIR is lower than a fourth threshold T4 and when resource A and resource B overlap in time.
  • the fourth threshold T4 may be substantially larger than the third threshold T3.
  • the UE3 706 may detect the collision based at least in part on a distance between the UE1 702 and the UE2 704. For example, in implementations where zone information is available (e.g., where zone ID of transmitter is included) , a distance ‘d’ may be estimated between the UE1 702 reserving resource A and the UE2 704 reserving resource B. In such implementations, the UE3 706 may detect a collision when the distance ‘d’ is less than a distance threshold and when resource A and resource B overlap in time.
  • the UE3 706 may further detect the collision based on the RSRP measured for the reservation for resource B.
  • the UE3 706 may be configured to detect the collision based on one of the above examples for detecting the collision, but may limit the detection to cases where the RSRP measured for the reservation for resource B is smaller than a max threshold and larger than a minimum threshold.
  • the automatic gain control (AGC) at the receiver may be saturated.
  • RSRP is below the minimum threshold, the re-scheduled transmission may run into additional collisions as a result of rescheduling.
  • the UE3 706 may determine whether the reservation for resource B has been rescheduled fewer than a specified number of times. For example, in some implementations, the UE3 706 may not detect a collision when the reservation B was already restricted from a transmission in a first transport block.
  • the UE3 706 On detection of the collision (e.g., the predicted pre-collision) , the UE3 706 sends a pre-collision indicator 714 to the UE2 704.
  • the pre-collision indicator may be frequency-division multiplexed with PSFCH resources. For example, if a PSFCH RB mapping rule provides 100 RBs, with 0-49 mapped to PSFCH, then the UE3 706 may utilize the remaining 50-99 RBs for pre-collision indicator resources. It should be clear that this is just an example, and any number of RBs may be utilized for PSFCH resources.
  • the UE3 706 may reuse the same subchannel ID to PSFCH RB mapping rule as is used for PSFCH for selecting a resource for sending the pre-collision indicator.
  • a resource may include a slot index, a resource block (RB) location, a sequence identifier (ID) , and a cyclic shift index.
  • the resource for the pre-collision indicator may be selected based at least in part on a start subchannel identifier (ID) , a user equipment (UE) ID for the UE2 704, and a start resource block (RB) location of physical sidelink pre-collision indication channel RBs.
  • the start subchannel ID may be the start subchannel ID for the resource used to carry the reservation to reserve resource B, or the start subchannel ID may be the start subchannel ID for the reserved resource B. In some examples, different options for the start subchannel ID may be used depending on whether the reservation is a self reservation or a normal reservation.
  • the UE3 706 may employ the start subchannel ID, the UE ID for UE2 704, and the start RB location of the PSFCH RBs as inputs for the formula described in 3GPP standards document TS 38.213, in section 16.3 detailing the procedure for reporting HARQ-ACK on sidelink, which is incorporated herein by this reference in its entirety.
  • a UE determines a number of PSFCH resources available for multiplexing the pre-collision indicator in a PSFCH transmission as where is a number of cyclic shift pairs for the resource pool provided by sl-NumMuxCS-Pair and, based on an indication by sl-PSFCH-CandidateResourceType,
  • sl-PSFCH-CandidateResourceType is configured as startSubCH, and the PRBs are associated with the starting sub-channel of the corresponding PSSCH;
  • sl-PSFCH-CandidateResourceType is configured as allocSubCH
  • the PRBs are associated with one or more sub-channels from the sub-channels of the corresponding PSSCH.
  • the UE3 706 may employ the mapping rule to determine PSFCH resources, which are first indexed according to an ascending order of the PRB index, from the PRBs, and then according to an ascending order of the cyclic shift pair index from the cyclic shift pairs.
  • the UE3 706 may give way to other general PSFCH transmissions over a pre-collision indicator transmission.
  • the UE2 704 may preempt its reservation on resource B. In some implementations, the UE2 704 may further select a new resource for its transmission. In some examples, the UE2 704 may send a self-reservation transmission to reserve the new resource 716 to replace resource B.
  • the UE2 704 may send the self-reservation transmission when the number of available subchannels is above a threshold, when the number of realized retransmissions by the UE2 704 for the packet associated with the transmission for resource B is below a threshold, when the priority is above a predefined threshold, when the remaining packet delay budget (PDB) is above a PDB threshold, when the number of remaining candidate resources is above a candidate resource threshold, or some combination of the above.
  • PDB packet delay budget
  • FIG. 8 is a block diagram illustrating an example of a hardware implementation of a UE 800 employing a processing system 802 according to at least one example of the present disclosure.
  • the processing system 802 is implemented with a bus architecture, represented generally by the bus 804.
  • the bus 804 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 802 and the overall design constraints.
  • the bus 804 communicatively couples together various circuits including one or more processors (represented generally by the processing circuit 806) , a memory 808, and computer-readable media (represented generally by the storage medium 810) .
  • the bus 804 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further.
  • a bus interface 812 provides an interface between the bus 804 and a transceiver 814.
  • the transceiver 814 provides a means for communicating with various other apparatus over a transmission medium.
  • the transceiver 814 may include a receive chain to receive one or more wireless signals, and/or a transmit chain to transmit one or more wireless signals.
  • a user interface 816 e.g., keypad, display, speaker, microphone, joystick
  • the processing circuit 806 is responsible for managing the bus 804 and general processing, including the execution of programming stored on the computer-readable storage medium 810.
  • the programming when executed by the processing circuit 806, causes the processing system 802 to perform the various functions described below for any particular apparatus.
  • the computer-readable storage medium 810 and the memory 808 may also be used for storing data that is manipulated by the processing circuit 806 when executing programming.
  • programming shall be construed broadly to include without limitation instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • the processing circuit 806 is arranged to obtain, process and/or send data, control data access and storage, issue commands, and control other desired operations.
  • the processing circuit 806 may include circuitry configured to implement desired programming provided by appropriate media, and/or circuitry configured to perform one or more functions described in this disclosure.
  • the processing circuit 806 may be implemented as one or more microprocessors, microcontrollers, digital signal processors (DSPs) , field programmable gate arrays (FPGAs) , programmable logic devices (PLDs) , state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure.
  • the UE 800 may be configured to perform any one or more of the functions described herein. That is, the processing circuit 806, as utilized in the UE 800, may be used to implement any one or more of the processes and procedures described below.
  • the processing circuit 806 may in some instances be implemented via a baseband or modem chip and in other implementations, the processing circuit 806 may include a number of devices distinct and different from a baseband or modem chip (e.g., in such scenarios as may work in concert to achieve examples discussed herein) . And as mentioned above, various hardware arrangements and components outside of a baseband modem processor can be used in implementations, including RF-chains, power amplifiers, modulators, buffers, interleavers, adders/summers, etc. These examples of the processing circuit 806 are for illustration and other suitable configurations within the scope of the present disclosure are also contemplated.
  • the processing circuit 806 may include a pre-collision detection circuit 818 and a pre-collision indicator circuit 820.
  • the pre-collision detection circuit 818 may generally include circuitry configured to determine a collision by sidelink transmissions scheduled for a first sidelink resource and a second sidelink resource.
  • the pre-collision indicator circuit 820 may generally include circuity configured to transmit a pre-collision indicator to another UE.
  • the storage medium 810 may represent one or more computer-readable devices for storing programming, such as processor executable code or instructions (e.g., software, firmware) , electronic data, databases, or other digital information.
  • the storage medium 810 may also be used for storing data that is manipulated by the processing circuit 806 when executing programming.
  • the storage medium 810 may be any available non-transitory media that can be accessed by a general purpose or special purpose processor, including portable or fixed storage devices, optical storage devices, and various other mediums capable of storing, containing and/or carrying programming.
  • the storage medium 810 may include a non-transitory computer-readable storage medium such as a magnetic storage device (e.g., hard disk, floppy disk, magnetic strip) , an optical storage medium (e.g., compact disk (CD) , digital versatile disk (DVD) ) , a smart card, a flash memory device (e.g., card, stick, key drive) , random access memory (RAM) , read only memory (ROM) , programmable ROM (PROM) , erasable PROM (EPROM) , electrically erasable PROM (EEPROM) , a register, a removable disk, and/or other mediums for storing programming, as well as any combination thereof.
  • a magnetic storage device e.g., hard disk, floppy disk, magnetic strip
  • an optical storage medium e.g., compact disk (CD) , digital versatile disk (DVD)
  • a smart card e.g., a flash memory device (e.g., card, stick,
  • the storage medium 810 may be coupled to the processing circuit 806 such that the processing circuit 806 can read information from, and write information to, the storage medium 810. That is, the storage medium 810 can be coupled to the processing circuit 806 so that the storage medium 810 is at least accessible by the processing circuit 806, including examples where the storage medium 810 is integral to the processing circuit 806 and/or examples where the storage medium 810 is separate from the processing circuit 806 (e.g., resident in the processing system 802, external to the processing system 802, distributed across multiple entities) .
  • the storage medium 810 may include pre-collision detection operations 824 and pre-collision indicator operations 826.
  • the pre-collision detection operations 824 are generally configured to cause the processing circuit 806 to determine a collision by sidelink transmissions scheduled for a first sidelink resource and a second sidelink resource, as described herein.
  • the pre-collision indicator operations 826 are generally configured to cause the processing circuit 806 to transmit a pre-collision indicator to another UE, as described herein.
  • the processing circuit 806 is configured to perform (independently or in conjunction with the storage medium 810) any or all of the processes, functions, steps and/or routines for any or all of the UEs described herein.
  • FIG. 9 shows a flow diagram illustrating a wireless communication method (e.g., operational on or via a UE 800) according to some examples.
  • a wireless communication method e.g., operational on or via a UE 800
  • some or all illustrated features may be omitted in a particular implementation within the scope of the present disclosure, and some illustrated features may not be required for implementation of all examples.
  • the process may be carried out by the UE 800 illustrated in FIG. 8. In some examples, the process may be carried out by any suitable apparatus or means for carrying out the functions or algorithm described below.
  • a UE may receive a first reservation of a first sidelink resource by a first device at 902.
  • the processing circuit 806 shown and described above in connection with FIG. 8 may provide a means to receive a first reservation of a first sidelink resource by a first device.
  • a UE may further receive a second reservation of a second sidelink resource by a second device at 904.
  • the second sidelink resource may overlap with the first sidelink resource in either time or time and frequency.
  • the processing circuit 806 shown and described above in connection with FIG. 8 may provide a means to receive a second reservation by a second device on a second sidelink resource.
  • a UE may send a pre-collision indicator to the second device to indicate that a second transmission on the second sidelink resource will collide with a first transmission on the first sidelink resource.
  • the processing circuit 806 shown and described above in connection with FIG. 8 may provide a means to send via the transceiver 814 a pre-collision indicator to the second device to indicate that a transmission on the second sidelink resource will collide with a transmission on the first sidelink resource.
  • FIG. 10 is a conceptual diagram illustrating an example of a hardware implementation for another exemplary UE 1000 employing a processing system 1002 according to at least one example of the present disclosure. Similar to the processing system 802 in FIG. 10, the processing system 1002 may be implemented with a bus architecture, represented generally by the bus 1004.
  • the bus 1004 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 1002 and the overall design constraints.
  • the bus 1004 communicatively couples together various circuits including one or more processors (represented generally by the processing circuit 1006) , a memory 1008, and computer-readable media (represented generally by the storage medium 1010) .
  • the bus 1004 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further.
  • a bus interface 1012 provides an interface between the bus 1004 and a transceiver 1014.
  • the transceiver 1014 provides a means for communicating with various other apparatus over a transmission medium.
  • the transceiver 314 may include a receive chain to receive one or more wireless signals, and/or a transmit chain to transmit one or more wireless signals.
  • a user interface 1016 e.g., keypad, display, speaker, microphone, joystick
  • the processing circuit 1006 is responsible for managing the bus 1004 and general processing, including the execution of programming stored on the computer-readable storage medium 1010.
  • the programming when executed by the processing circuit 1006, causes the processing system 1002 to perform the various functions described below for any particular apparatus.
  • the computer-readable storage medium 1010 and the memory 1008 may also be used for storing data that is manipulated by the processing circuit 1006 when executing programming.
  • the processing circuit 1006 is arranged to obtain, process and/or send data, control data access and storage, issue commands, and control other desired operations.
  • the processing circuit 1006 may include circuitry configured to implement desired programming provided by appropriate media in at least one example, and/or circuitry configured to perform one or more functions described in this disclosure.
  • the processing circuit 1006 may be implemented and/or configured according to any of the examples of the processing circuit 706 described above.
  • the processing circuit 1006 may include a sidelink reservation circuit 1020 and a pre-collision indicator circuit 1022.
  • the sidelink reservation circuit 1020 may generally include circuitry configured to send a reservation message to reserve a sidelink resource for a transmission, and to transmit a self-reservation message to reserve a new sidelink resource to replace a first sidelink resource, as described in more detail hereinafter.
  • the pre-collision indicator circuit 1022 may generally include circuitry configured to receive a pre-collision indicator indicating that a transmission on a first sidelink resource will collide with a transmission by another device on a second sidelink resource.
  • the storage medium 1010 may represent one or more computer-readable devices for storing programming, such as processor executable code or instructions (e.g., software, firmware) , electronic data, databases, or other digital information.
  • the storage medium 1010 may be configured and/or implemented in a manner similar to the storage medium 810 described above.
  • the storage medium 1010 may include sidelink reservation operations 1024 and pre-collision indicator operations 1026.
  • the sidelink reservation operations 1024 may be configured to cause the processing circuit 1006 to send a reservation message to reserve a sidelink resource for a transmission, and to transmit a self-reservation message to reserve a new sidelink resource to replace a first sidelink resource, as described in more detail hereinafter.
  • the pre-collision indicator operations 1026 may be configured to cause the processing circuit 1006 to receive a pre-collision indicator indicating that a transmission on a first sidelink resource will collide with a transmission by another device on a second sidelink resource.
  • the processing circuit 1006 is configured to perform (independently or in conjunction with the storage medium 1010) any or all of the processes, functions, steps and/or routines for any or all of the UEs described herein.
  • FIG. 11 shows a flow diagram illustrating a wireless communication method (e.g., operational on or via a UE 1000) according to some examples.
  • a wireless communication method e.g., operational on or via a UE 1000
  • some or all illustrated features may be omitted in a particular implementation within the scope of the present disclosure, and some illustrated features may not be required for implementation of all examples.
  • the process may be carried out by the UE 1000 illustrated in FIG. 10. In some examples, the process may be carried out by any suitable apparatus or means for carrying out the functions or algorithm described below.
  • a UE may send a reservation for a first transmission on a first sidelink resource at 1102.
  • the processing circuit 1006 shown and described above in connection with FIG. 10 may provide a means to send a reservation for a first transmission on a first sidelink resource.
  • a UE may receive a pre-collision indicator indicating that the first transmission on the first sidelink resource will collide with a second transmission by another device on a second sidelink resource.
  • the processing circuit 1006 shown and described above in connection with FIG. 10 may provide a means to receive, via the transceiver 1014, a pre-collision indicator indicating that the first transmission on the first sidelink resource will collide with a second transmission by another device on a second sidelink resource.
  • a UE may transmit a self-reservation message to reserve a new sidelink resource to replace the first sidelink resource.
  • the processing circuit 1006 shown and described above in connection with FIG. 10 may provide a means to transmit a self-reservation message to reserve a new sidelink resource to replace the first sidelink resource.
  • a method for wireless communication comprising: receiving a first reservation of a first sidelink resource from a first device; receiving a second reservation of a second sidelink resource from a second device; transmitting a pre-collision indicator to the second device to indicate that a second transmission on the second sidelink resource will collide with a first transmission on the first sidelink resource.
  • Aspect 2 The method of aspect 1, further comprising determining a collision will occur between the second transmission on the second sidelink resource and the first transmission on the first sidelink resource.
  • Aspect 3 The method of aspect 2 wherein determining a collision will occur by a second transmission on the second sidelink resource with a first transmission on the first sidelink resource comprises: determining that the second sidelink resource overlaps in time and frequency with the first sidelink resource; determining a first reference signal received power (RSRP) associated with the first reservation; determining a second RSRP associated with the second reservation; calculating a signal to interference ratio (SIR) by dividing the second RSRP associated with the second reservation by the first RSRP associated with the first reservation; and determining the collision will occur when the SIR is lower than a first threshold.
  • RSRP reference signal received power
  • SIR signal to interference ratio
  • Aspect 4 The method of aspect 2 wherein determining a collision will occur by a second transmission on the second sidelink resource with a first transmission on the first sidelink resource comprises: determining that the second sidelink resource overlaps in time with the first sidelink resource; determining a first reference signal received power (RSRP) associated with the first reservation; determining a second RSRP associated with the second reservation; calculating a signal to interference ratio (SIR) by dividing the second RSRP associated with the second reservation by the first RSRP associated with the first reservation; and determining the collision will occur when the SIR is lower than a second threshold.
  • RSRP reference signal received power
  • SIR signal to interference ratio
  • Aspect 5 The method of aspect 2 wherein determining a collision will occur by a second transmission on the second sidelink resource with a first transmission on the first sidelink resource comprises: determining that the second sidelink resource overlaps in time and frequency with the first sidelink resource; determining a first reference signal received power (RSRP) associated with the first reservation; determining a second RSRP associated with the second reservation; calculating a signal to interference ratio (SIR) by dividing the second RSRP associated with the second reservation by the first RSRP associated with the first reservation; and determining the collision will occur when the SIR is higher than a third threshold.
  • RSRP reference signal received power
  • SIR signal to interference ratio
  • Aspect 6 The method of aspect 2 wherein determining a collision will occur by a second transmission on the second sidelink resource with a first transmission on the first sidelink resource comprises: determining that the second sidelink resource overlaps in time and frequency with the first sidelink resource; determining a first reference signal received power (RSRP) associated with the first reservation; determining a second RSRP associated with the second reservation; calculating a signal to interference ratio (SIR) by dividing the second RSRP associated with the second reservation by the first RSRP associated with the first reservation; and determining the collision will occur when the SIR is higher than a third threshold.
  • RSRP reference signal received power
  • SIR signal to interference ratio
  • Aspect 7 The method of any of aspects 1 through 6, wherein transmitting the pre-collision indicator comprises: selecting a resource for transmitting the pre-collision indicator base at least in part on a start subchannel identifier (ID) , a user equipment (UE) ID for the second device, and a start resource block (RB) location of physical sidelink feedback channel (PSFCH) RBs.
  • ID start subchannel identifier
  • UE user equipment
  • RB start resource block
  • PSFCH physical sidelink feedback channel
  • Aspect 8 The method of any of aspects 1 through 7, wherein the second sidelink resource overlaps with the first sidelink resource in either time or time and frequency.
  • Aspect 9 An apparatus for wireless communication comprising a transceiver, a memory, and a processor communicatively coupled to the transceiver and the memory, the processor and memory configured to perform a method of any one of aspects 1 through 8.
  • a wireless communication device comprising means for performing a method of any one of aspects 1 through 8.
  • Aspect 11 A non-transitory processor-readable storage medium storing processor-executable instructions for causing a processing circuit to perform a method of any one of aspects 1 through 8.
  • a method of wireless communication comprising: sending a reservation for a first transmission on a first sidelink resource; receiving a pre-collision indicator indicating that the transmission on the first sidelink resource will collide with a second transmission by another device on a second sidelink resource; and transmitting a self-reservation message to reserve a new sidelink resource to replace the first sidelink resource.
  • Aspect 13 The method of Aspect 12, wherein receiving the pre-collision indicator comprises: receiving the pre-collision indicator on a resource based at least in part on a start subchannel identifier (ID) , a user equipment (UE) ID for the other device, and a start resource block (RB) location of physical sidelink feedback channel (PSFCH) RBs.
  • ID start subchannel identifier
  • UE user equipment
  • RB start resource block
  • Aspect 14 The method of Aspect 12 or Aspect 13, wherein transmitting the self-reservation message comprises transmitting the self-reservation message when at least one of: a number of available subchannels is above a threshold; a number of realized retransmissions by the apparatus for a packet associated with the first transmission is below a threshold; a priority for the first transmission is above a predefined threshold; a remaining packet delay budget (PDB) is above a PDB threshold; or a number of remaining candidate resources is above a candidate resource threshold.
  • PDB packet delay budget
  • Aspect 15 An apparatus for wireless communication comprising a transceiver, a memory, and a processor communicatively coupled to the transceiver and the memory, the processor and memory configured to perform a method of any one of aspects 12 through 14.
  • a wireless communication device comprising means for performing a method of any one of aspects 12 through 14.
  • Aspect 17 A non-transitory processor-readable storage medium storing processor-executable instructions for causing a processing circuit to perform a method of any one of aspects 12 through 14.
  • various aspects may be implemented within other systems defined by 3GPP or combinations of such systems. These systems may include candidates such as 5G New Radio (NR) , Long-Term Evolution (LTE) , the Evolved Packet System (EPS) , the Universal Mobile Telecommunication System (UMTS) , and/or the Global System for Mobile (GSM) . Various aspects may also be extended to systems defined by the 3rd Generation Partnership Project 2 (3GPP2) , such as CDMA2000 and/or Evolution-Data Optimized (EV-DO) .
  • 3GPP2 3rd Generation Partnership Project 2
  • 3GPP2 3rd Generation Partnership Project 2
  • CDMA2000 Code Division Multiple Access 2000
  • EV-DO Evolution-Data Optimized
  • Wi-Fi Wi-Fi
  • WiMAX IEEE 802.16
  • UWB Ultra-Wideband
  • Bluetooth Bluetooth
  • the actual telecommunication standard, network architecture, and/or communication standard employed will depend on the specific application and the overall design constraints imposed on the system.
  • the word “exemplary” is used to mean “serving as an example, instance, or illustration. ” Any implementation or aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects of the disclosure. Likewise, the term “aspects” does not require that all aspects of the disclosure include the discussed feature, advantage or mode of operation.
  • the term “coupled” is used herein to refer to the direct or indirect coupling between two objects. For example, if object A physically touches object B, and object B touches object C, then objects A and C may still be considered coupled to one another-even if they do not directly physically touch each other. For instance, a first object may be coupled to a second object even though the first object is never directly physically in contact with the second object.
  • circuit and “circuitry” are used broadly, and intended to include both hardware implementations of electrical devices and conductors that, when connected and configured, enable the performance of the functions described in the present disclosure, without limitation as to the type of electronic circuits, as well as software implementations of information and instructions that, when executed by a processor, enable the performance of the functions described in the present disclosure.
  • FIGS. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and/or 11 may be rearranged and/or combined into a single component, step, feature or function or embodied in several components, steps, or functions. Additional elements, components, steps, and/or functions may also be added or not utilized without departing from the novel features of the present disclosure.
  • the apparatus, devices and/or components illustrated in FIGS. 1, 3, 7, 8, and/or 10 may be configured to perform or employ one or more of the methods, features, parameters, and/or steps described herein with reference to FIGS. 2, 4, 5, 6, 7, 9, and/or 11.
  • the novel algorithms described herein may also be efficiently implemented in software and/or embedded in hardware.

Abstract

Un UE peut être configuré pour recevoir, d'un premier dispositif, une première réservation d'une première ressource de liaison latérale et recevoir, d'un second dispositif, une seconde réservation d'une seconde ressource de liaison latérale, la seconde ressource de liaison latérale chevauchant la première ressource de liaison latérale soit dans le temps, soit dans le temps et en fréquence. Il peut être déterminé qu'une collision surviendra entre une seconde transmission sur la seconde ressource de liaison latérale et une première transmission sur la première ressource de liaison latérale. Un pré-indicateur de collision peut être envoyé au second dispositif pour indiquer que la seconde transmission sur la seconde ressource de liaison latérale entrera en collision avec la première transmission sur la première ressource de liaison latérale. L'invention concerne également d'autres aspects, exemples et caractéristiques.
PCT/CN2021/093079 2021-05-11 2021-05-11 Présignalisation de collision dans des systèmes de communication sans fil WO2022236686A1 (fr)

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