WO2021217679A1 - Commutation dynamique entre des ressources de transmission de groupement commun et des ressources de transmission de groupement exceptionnel - Google Patents

Commutation dynamique entre des ressources de transmission de groupement commun et des ressources de transmission de groupement exceptionnel Download PDF

Info

Publication number
WO2021217679A1
WO2021217679A1 PCT/CN2020/088539 CN2020088539W WO2021217679A1 WO 2021217679 A1 WO2021217679 A1 WO 2021217679A1 CN 2020088539 W CN2020088539 W CN 2020088539W WO 2021217679 A1 WO2021217679 A1 WO 2021217679A1
Authority
WO
WIPO (PCT)
Prior art keywords
pool
transmission resources
exceptional
congestion
threshold
Prior art date
Application number
PCT/CN2020/088539
Other languages
English (en)
Inventor
Jintao HOU
Feng Chen
Haizhou LIU
Zengyu Hao
Yi Qin
Hongjin GUO
Hao Chen
Original Assignee
Qualcomm Incorporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to PCT/CN2020/088539 priority Critical patent/WO2021217679A1/fr
Publication of WO2021217679A1 publication Critical patent/WO2021217679A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0289—Congestion control
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup

Definitions

  • aspects of the present disclosure generally relate to wireless communications, and more particularly to techniques and apparatuses for vehicle-to-everything (V2X) communications incorporating dynamic switching between transmission resources from a common pool and exceptional pool.
  • V2X vehicle-to-everything
  • Wireless communications systems are widely deployed to provide various telecommunications services such as telephony, video, data, messaging, and broadcasts.
  • Typical wireless communications systems may employ multiple-access technologies capable of supporting communications with multiple users by sharing available system resources. Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • 5G NR fifth generation new radio
  • 3GPP Third Generation Partnership Project
  • 5G NR includes services associated with enhanced mobile broadband (eMBB) , massive machine type communications (mMTC) , and ultra reliable low latency communications (URLLC) .
  • eMBB enhanced mobile broadband
  • mMTC massive machine type communications
  • URLLC ultra reliable low latency communications
  • 5G NR may be based on the fourth generation (4G) long term evolution (LTE) standard.
  • 4G fourth generation
  • LTE long term evolution
  • Wireless communications systems may include or provide support for various types of communications systems, such as vehicle related communications systems (e.g., vehicle-to-everything (V2X) communications systems) .
  • Vehicle related communications systems may be used by vehicles to increase safety and to help prevent collisions of vehicles. Information regarding inclement weather, nearby accidents, road conditions, and/or other information may be conveyed to a driver via the vehicle related communications system.
  • vehicles may communicate directly with each other using device-to-device (D2D) communications over a D2D wireless link.
  • D2D device-to-device
  • a method includes sensing congestion of transmission resources of a common pool for vehicle to everything (V2X) sidelink communications.
  • the method also includes sensing congestion of transmission resources of an exceptional pool for V2X sidelink communications.
  • the method further includes switching between transmission resources of the common pool and transmission resources of the exceptional pool when the sensing indicates a difference in congestion between the common pool and the exceptional pool.
  • V2X vehicle to everything
  • a UE for wireless communications includes a memory and at least one processor operatively coupled to the memory.
  • the memory and the processor (s) are configured to sense congestion of transmission resources of a common pool for vehicle to everything (V2X) sidelink communications.
  • the UE is configured to sense congestion of transmission resources of an exceptional pool for V2X sidelink communications.
  • the UE is further configured to switch between transmission resources of the common pool and transmission resources of the exceptional pool when the sensing indicates a difference in congestion between the common pool and the exceptional pool.
  • V2X vehicle to everything
  • the UE includes means for sensing congestion of transmission resources of a common pool for vehicle to everything (V2X) sidelink communications.
  • the UE also includes means for sensing congestion of transmission resources of an exceptional pool for V2X sidelink communications.
  • the UE further includes means for switching between transmission resources of the common pool and transmission resources of the exceptional pool when the sensing indicates a difference in congestion between the common pool and the exceptional pool.
  • V2X vehicle to everything
  • a non-transitory computer-readable medium with program code recorded thereon is disclosed.
  • the program code is executed by a UE and includes program code to sense congestion of transmission resources of a common pool for vehicle to everything (V2X) sidelink communications.
  • the UE also includes program code to sense congestion of transmission resources of an exceptional pool for V2X sidelink communications.
  • the UE further includes program code to switch between transmission resources of the common pool and transmission resources of the exceptional pool when the sensing indicates a difference in congestion between the common pool and the exceptional pool.
  • FIGURE 1 is a diagram illustrating an example of a wireless communications system and an access network.
  • FIGURES 2A, 2B, 2C, and 2D are diagrams illustrating examples of a first fifth generation (5G) new radio (NR) frame, downlink (DL) channels within a 5G NR subframe, a second 5G NR frame, and uplink (UL) channels within a 5G NR subframe, respectively.
  • 5G fifth generation
  • NR new radio
  • FIGURE 3 is a diagram illustrating an example of a base station and user equipment (UE) in an access network.
  • FIGURE 4 is a diagram illustrating an example of a vehicle-to-everything (V2X) system, in accordance with various aspects of the present disclosure.
  • V2X vehicle-to-everything
  • FIGURE 5 is a block diagram illustrating an example of a vehicle-to-everything (V2X) system with a road side unit (RSU) , according to aspects of the present disclosure.
  • V2X vehicle-to-everything
  • RSU road side unit
  • FIGURE 6 is a block diagram illustrating a user equipment (UE) with available transmission resource pools, in accordance with various aspects of the present disclosure.
  • UE user equipment
  • FIGURE 7 is a flow diagram illustrating an example process for dynamically switching between resource pools, in accordance with various aspects of the present disclosure.
  • FIGURE 8 is a diagram illustrating an example process performed, for example, by a sidelink user equipment, for dynamically switching between resource pools, in accordance with various aspects of the present disclosure.
  • wireless devices may generally communicate with each other via one or more network entities such as a base station or scheduling entity.
  • Some networks may support device-to-device (D2D) communications that enable discovery of, and communications with nearby devices using a direct link between devices (e.g., without passing through a base station, relay, or another node) .
  • D2D communications can enable mesh networks and device-to-network relay functionality.
  • Some examples of D2D technology include Bluetooth pairing, Wi-Fi Direct, Miracast, and LTE-D.
  • D2D communications may also be referred to as point-to-point (P2P) or sidelink communications.
  • P2P point-to-point
  • D2D communications may be implemented using licensed or unlicensed bands. Additionally, D2D communications can avoid the overhead involving the routing to and from the base station. Therefore, D2D communications can improve throughput, reduce latency, and/or increase energy efficiency.
  • a type of D2D communications may include vehicle-to-everything (V2X) communications.
  • V2X communications may assist autonomous vehicles in communicating with each other.
  • autonomous vehicles may include multiple sensors (e.g., light detection and ranging (LiDAR) , radar, cameras, etc. ) .
  • the autonomous vehicle’s sensors are line of sight sensors.
  • V2X communications may allow autonomous vehicles to communicate with each other for non-line of sight situations.
  • V2X vehicle-to-everything
  • UE user equipment
  • Tx transmit
  • Tx transmit
  • the UE can sense congestion (e.g., channel busy ratio (CBR) information) for each pool. It would be desirable for the UE to dynamically switch between the common Tx pool and the exceptional Tx pool based on congestion information sensed for each pool.
  • CBR channel busy ratio
  • the UE only uses resources from a single pool.
  • the exceptional Tx pool is free when the UE is using the common Tx pool. If the result of sensing the resources of the common Tx pool indicates high congestion in the common pool, it would be desirable for the UE to be allowed to use the resources in the exceptional Tx pool to improve transmit efficiency.
  • FIGURE 1 is a diagram illustrating an example of a wireless communications system and an access network 100.
  • the wireless communications system (also referred to as a wireless wide area network (WWAN) ) includes base stations 102, UEs 104, an evolved packet core (EPC) 160, and another core network 190 (e.g., a 5G core (5GC) ) .
  • the base stations 102 may include macrocells (high power cellular base station) and/or small cells 102’ (low power cellular base station) .
  • the macrocells include base stations.
  • the small cells 102’ include femtocells, picocells, and microcells.
  • the base stations 102 configured for 4G LTE may interface with the EPC 160 through backhaul links 132 (e.g., S1 interface) .
  • the base stations 102 configured for 5G NR may interface with core network 190 through backhaul links 184.
  • UMTS evolved universal mobile telecommunications system
  • 5G NR next generation RAN
  • the base stations 102 may perform one or more of the following functions: transfer of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity) , inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS) , subscriber and equipment trace, RAN information management (RIM) , paging, positioning, and delivery of warning messages.
  • NAS non-access stratum
  • RAN radio access network
  • MBMS multimedia broadcast multicast service
  • RIM RAN information management
  • the base stations 102 may communicate directly or indirectly (e.g., through the EPC 160 or core network 190) with each other over backhaul links 134 (e.g., X2 interface) .
  • the backhaul links 134 may be wired or wireless.
  • the base stations 102 may wirelessly communicate with the UEs 104. Each of the base stations 102 may provide communications coverage for a respective geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, the small cell 102' may have a coverage area 110' that overlaps the coverage area 110 of one or more macro base stations 102.
  • a network that includes both small cell and macrocells may be known as a heterogeneous network.
  • a heterogeneous network may also include home evolved Node Bs (eNBs) (HeNBs) , which may provide service to a restricted group known as a closed subscriber group (CSG) .
  • eNBs home evolved Node Bs
  • CSG closed subscriber group
  • the communications links 120 between the base stations 102 and the UEs 104 may include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to a base station 102 and/or downlink (DL) (also referred to as forward link) transmissions from a base station 102 to a UE 104.
  • UL uplink
  • DL downlink
  • the communications links 120 may use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity.
  • MIMO multiple-input and multiple-output
  • the communications links may be through one or more carriers.
  • the base stations 102 /UEs 104 may use spectrum up to Y MHz (e.g., 5, 10, 15, 20, 100, 400, etc., MHz) bandwidth per carrier allocated in a carrier aggregation of up to a total of Yx MHz (x component carriers) used for transmission in each direction.
  • the carriers may or may not be adjacent to each other. Allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL than for UL) .
  • the component carriers may include a primary component carrier and one or more secondary component carriers.
  • a primary component carrier may be referred to as a primary cell (PCell) and a secondary component carrier may be referred to as a secondary cell (SCell) .
  • PCell primary cell
  • SCell secondary cell
  • D2D communications link 158 may use the DL/UL WWAN spectrum.
  • the D2D communications link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , and a physical sidelink control channel (PSCCH) .
  • sidelink channels such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , and a physical sidelink control channel (PSCCH) .
  • sidelink channels such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , and a physical sidelink control channel (PSCCH) .
  • D2D communications may be through a variety of wireless D2D communications systems, such as FlashLinQ, WiMedia, Bluetooth, Zi
  • the wireless communications system may further include a Wi-Fi access point (AP) 150 in communication with Wi-Fi stations (STAs) 152 via communications links 154 in a 5 GHz unlicensed frequency spectrum.
  • AP Wi-Fi access point
  • STAs Wi-Fi stations
  • communications links 154 in a 5 GHz unlicensed frequency spectrum.
  • the STAs 152 /AP 150 may perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available.
  • CCA clear channel assessment
  • the small cell 102' may operate in a licensed and/or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell 102' may employ NR and use the same 5 GHz unlicensed frequency spectrum as used by the Wi-Fi AP 150. The small cell 102', employing NR in an unlicensed frequency spectrum, may boost coverage to and/or increase capacity of the access network.
  • a base station 102 may include an eNB, gNodeB (gNB) , or another type of base station.
  • Some base stations, such as gNB 180 may operate in a traditional sub 6 GHz spectrum, in millimeter wave (mmW) frequencies, and/or near mmW frequencies in communication with the UE 104.
  • mmW millimeter wave
  • mmW millimeter wave
  • mmW base station Extremely high frequency (EHF) is part of the RF in the electromagnetic spectrum. EHF has a range of 30 GHz to 300 GHz and a wavelength between 1 millimeter and 10 millimeters.
  • Radio waves in the band may be referred to as a millimeter wave.
  • Near mmW may extend down to a frequency of 3 GHz with a wavelength of 100 millimeters.
  • the super high frequency (SHF) band extends between 3 GHz and 30 GHz, also referred to as centimeter wave.
  • Communications using the mmW /near mmW radio frequency band (e.g., 3 GHz –300 GHz) has extremely high path loss and a short range.
  • the mmW base station 180 may utilize beamforming 182 with the UE 104 to compensate for the extremely high path loss and short range.
  • the base station 180 may transmit a beamformed signal to the UE 104 in one or more transmit directions 182'.
  • the UE 104 may receive the beamformed signal from the base station 180 in one or more receive directions 182” .
  • the UE 104 may also transmit a beamformed signal to the base station 180 in one or more transmit directions.
  • the base station 180 may receive the beamformed signal from the UE 104 in one or more receive directions.
  • the base station 180 /UE 104 may perform beam training to determine the best receive and transmit directions for each of the base station 180 /UE 104.
  • the transmit and receive directions for the base station 180 may or may not be the same.
  • the transmit and receive directions for the UE 104 may or may not be the same.
  • the EPC 160 may include a mobility management entity (MME) 162, other MMEs 164, a serving gateway 166, a multimedia broadcast multicast service (MBMS) gateway 168, a broadcast multicast service center (BM-SC) 170, and a packet data network (PDN) gateway 172.
  • MME mobility management entity
  • MBMS multimedia broadcast multicast service
  • BM-SC broadcast multicast service center
  • PDN packet data network gateway 172.
  • the MME 162 may be in communication with a home subscriber server (HSS) 174.
  • HSS home subscriber server
  • the MME 162 is the control node that processes the signaling between the UEs 104 and the EPC 160.
  • the MME 162 provides bearer and connection management. All user Internet protocol (IP) packets are transferred through the serving gateway 166, which itself is connected to the PDN gateway 172.
  • the PDN gateway 172 provides UE IP address allocation as well as other functions.
  • the PDN gateway 172 and the BM-SC 170 are connected to the IP services 176.
  • the IP services 176 may include the Internet, an intranet, an IP multimedia subsystem (IMS) , a PS streaming service, and/or other IP services.
  • the BM-SC 170 may provide functions for MBMS user service provisioning and delivery.
  • the BM-SC 170 may serve as an entry point for content provider MBMS transmission, may be used to authorize and initiate MBMS bearer services within a public land mobile network (PLMN) , and may be used to schedule MBMS transmissions.
  • PLMN public land mobile network
  • the MBMS gateway 168 may be used to distribute MBMS traffic to the base stations 102 belonging to a multicast broadcast single frequency network (MBSFN) area broadcasting a particular service, and may be responsible for session management (start/stop) and for collecting eMBMS related charging information.
  • MMSFN multicast broadcast single frequency network
  • the core network 190 may include an access and mobility management function (AMF) 192, other AMFs 193, a session management function (SMF) 194, and a user plane function (UPF) 195.
  • the AMF 192 may be in communication with a unified data management (UDM) 196.
  • the AMF 192 is the control node that processes the signaling between the UEs 104 and the core network 190.
  • the AMF 192 provides quality of service (QoS) flow and session management. All user Internet protocol (IP) packets are transferred through the UPF 195.
  • the UPF 195 provides UE IP address allocation as well as other functions.
  • the UPF 195 is connected to the IP services 197.
  • the IP services 197 may include the Internet, an intranet, an IP multimedia subsystem (IMS) , a PS streaming service, and/or other IP services.
  • IMS IP multimedia subsystem
  • the base station 102 may also be referred to as a gNB, Node B, evolved Node B (eNB) , an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS) , an extended service set (ESS) , a transmit reception point (TRP) , or some other suitable terminology.
  • the base station 102 provides an access point to the EPC 160 or core network 190 for a UE 104.
  • Examples of UEs 104 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA) , a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player) , a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor/actuator, a display, or any other similar functioning device.
  • SIP session initiation protocol
  • PDA personal digital assistant
  • Some of the UEs 104 may be referred to as IoT devices (e.g., a parking meter, gas pump, toaster, vehicles, heart monitor, etc. ) .
  • the UE 104 may also be referred to as a station, a mobile station, 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, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.
  • a transmitting device such as the UE 104 may sense congestion of transmission resources of a common pool for V2X sidelink communications and also of an exceptional pool.
  • the UE 104 switches between transmission resources of the common pool and transmission resources of the exceptional pool when the sensing indicates a difference in congestion between the common pool and the exceptional pool.
  • 5G NR 5G NR
  • the description may be applicable to other similar areas, such as LTE, LTE-A, CDMA, GSM, and other wireless technologies.
  • FIGURE 2A is a diagram 200 illustrating an example of a first subframe within a 5G NR frame structure.
  • FIGURE 2B is a diagram 230 illustrating an example of DL channels within a 5G NR subframe.
  • FIGURE 2C is a diagram 250 illustrating an example of a second subframe within a 5G NR frame structure.
  • FIGURE 2D is a diagram 280 illustrating an example of UL channels within a 5G NR subframe.
  • the 5G NR frame structure may be frequency division duplex (FDD) in which for a particular set of subcarriers (carrier system bandwidth) , subframes within the set of subcarriers are dedicated for either DL or UL, or may be time division duplex (TDD) in which for a particular set of subcarriers (carrier system bandwidth) , subframes within the set of subcarriers are dedicated for both DL and UL.
  • FDD frequency division duplex
  • TDD time division duplex
  • the 5G NR frame structure is assumed to be TDD, with subframe 4 being configured with slot format 28 (with mostly DL) , where D is DL, U is UL, and X is flexible for use between DL/UL, and subframe 3 being configured with slot format 34 (with mostly UL) . While subframes 3, 4 are shown with slot formats 34, 28, respectively, any particular subframe may be configured with any of the various available slot formats 0-61. Slot formats 0, 1 are all DL, UL, respectively. Other slot formats 2-61 include a mix of DL, UL, and flexible symbols.
  • UEs are configured with the slot format (dynamically through DL control information (DCI) , or semi-statically/statically through radio resource control (RRC) signaling) through a received slot format indicator (SFI) .
  • DCI DL control information
  • RRC radio resource control
  • SFI received slot format indicator
  • a frame (10 ms) may be divided into 10 equally sized subframes (1 ms) .
  • Each subframe may include one or more time slots.
  • Subframes may also include mini-slots, which may include 7, 4, or 2 symbols.
  • Each slot may include 7 or 14 symbols, depending on the slot configuration. For slot configuration 0, each slot may include 14 symbols, and for slot configuration 1, each slot may include 7 symbols.
  • the symbols on DL may be cyclic prefix (CP) OFDM (CP-OFDM) symbols.
  • the symbols on UL may be CP-OFDM symbols (for high throughput scenarios) or discrete Fourier transform (DFT) spread OFDM (DFT-S-OFDM) symbols (also referred to as single carrier frequency-division multiple access (SC-FDMA) symbols) (for power limited scenarios; limited to a single stream transmission) .
  • the number of slots within a subframe is based on the slot configuration and the numerology. For slot configuration 0, different numerologies ⁇ 0 to 5 allow for 1, 2, 4, 8, 16, and 32 slots, respectively, per subframe. For slot configuration 1, different numerologies 0 to 2 allow for 2, 4, and 8 slots, respectively, per subframe. Accordingly, for slot configuration 0 and numerology ⁇ , there are 14 symbols/slot and 2 ⁇ slots/subframe.
  • the subcarrier spacing and symbol length/duration are a function of the numerology.
  • the subcarrier spacing may be equal to 2 ⁇ *15 kHz, where ⁇ is the numerology 0 to 5.
  • ⁇ is the numerology 0 to 5.
  • the symbol length/duration is inversely related to the subcarrier spacing.
  • the subcarrier spacing is 15 kHz and symbol duration is approximately 66.7 ⁇ s.
  • a resource grid may represent the frame structure.
  • Each time slot includes a resource block (RB) (also referred to as physical RBs (PRBs) ) that extends 12 consecutive subcarriers.
  • RB resource block
  • PRBs physical RBs
  • the resource grid is divided into multiple resource elements (REs) . The number of bits carried by each RE depends on the modulation scheme.
  • the RS may include demodulation RS (DM-RS) (indicated as Rx for one particular configuration, where 100x is the port number, but other DM-RS configurations are possible) and channel state information reference signals (CSI-RS) for channel estimation at the UE.
  • DM-RS demodulation RS
  • CSI-RS channel state information reference signals
  • the RS may also include beam measurement RS (BRS) , beam refinement RS (BRRS) , and phase tracking RS (PT-RS) .
  • BRS beam measurement RS
  • BRRS beam refinement RS
  • PT-RS phase tracking RS
  • FIGURE 2B illustrates an example of various DL channels within a subframe of a frame.
  • the physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs) , each CCE including nine RE groups (REGs) , each REG including four consecutive REs in an OFDM symbol.
  • a primary synchronization signal (PSS) may be within symbol 2 of particular subframes of a frame. The PSS is used by a UE 104 to determine subframe/symbol timing and a physical layer identity.
  • a secondary synchronization signal (SSS) may be within symbol 4 of particular subframes of a frame. The SSS is used by a UE to determine a physical layer cell identity group number and radio frame timing.
  • the UE can determine a physical cell identifier (PCI) . Based on the PCI, the UE can determine the locations of the aforementioned DM-RS.
  • the physical broadcast channel (PBCH) which carries a master information block (MIB) , may be logically grouped with the PSS and SSS to form a synchronization signal (SS) /PBCH block.
  • the MIB provides a number of RBs in the system bandwidth and a system frame number (SFN) .
  • the physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH such as system information blocks (SIBs) , and paging messages.
  • SIBs system information blocks
  • some of the REs carry DM-RS (indicated as R for one particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station.
  • the UE may transmit DM-RS for the physical uplink control channel (PUCCH) and DM-RS for the physical uplink shared channel (PUSCH) .
  • the PUSCH DM-RS may be transmitted in the first one or two symbols of the PUSCH.
  • the PUCCH DM-RS may be transmitted in different configurations depending on whether short or long PUCCHs are transmitted and depending on the particular PUCCH format used.
  • the UE may transmit sounding reference signals (SRS) .
  • the SRS may be used by a base station for channel quality estimation to enable frequency-dependent scheduling on the UL.
  • FIGURE 2D illustrates an example of various UL channels within a subframe of a frame.
  • the PUCCH may be located as indicated in one configuration.
  • the PUCCH carries uplink control information (UCI) , such as scheduling requests, a channel quality indicator (CQI) , a precoding matrix indicator (PMI) , a rank indicator (RI) , and HARQ ACK/NACK feedback.
  • UCI uplink control information
  • the PUSCH carries data, and may additionally be used to carry a buffer status report (BSR) , a power headroom report (PHR) , and/or UCI.
  • BSR buffer status report
  • PHR power headroom report
  • FIGURE 3 is a block diagram of a base station 310 in communication with a UE 350 in an access network.
  • IP packets from the EPC 160 may be provided to a controller/processor 375.
  • the controller/processor 375 implements layer 3 and layer 2 functionality.
  • Layer 3 includes a radio resource control (RRC) layer
  • layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer.
  • RRC radio resource control
  • SDAP service data adaptation protocol
  • PDCP packet data convergence protocol
  • RLC radio link control
  • MAC medium access control
  • the controller/processor 375 provides RRC layer functionality associated with broadcasting of system information (e.g., MIB, SIBs) , RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release) , inter radio access technology (RAT) mobility, and measurement configuration for UE measurement reporting; PDCP layer functionality associated with header compression /decompression, security (ciphering, deciphering, integrity protection, integrity verification) , and handover support functions; RLC layer functionality associated with the transfer of upper layer packet data units (PDUs) , error correction through ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs) , re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs) , demultiplexing of MAC SDU
  • the transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions.
  • Layer 1 which includes a physical (PHY) layer, may include error detection on the transport channels, forward error correction (FEC) coding/decoding of the transport channels, interleaving, rate matching, mapping onto physical channels, modulation/demodulation of physical channels, and MIMO antenna processing.
  • the TX processor 316 handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK) , quadrature phase-shift keying (QPSK) , M-phase-shift keying (M-PSK) , M-quadrature amplitude modulation (M-QAM) ) .
  • BPSK binary phase-shift keying
  • QPSK quadrature phase-shift keying
  • M-PSK M-phase-shift keying
  • M-QAM M-quadrature amplitude modulation
  • the coded and modulated symbols may then be split into parallel streams.
  • Each stream may then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and/or frequency domain, and then combined together using an inverse fast Fourier transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream.
  • IFFT inverse fast Fourier transform
  • the OFDM stream is spatially precoded to produce multiple spatial streams.
  • Channel estimates from a channel estimator 374 may be used to determine the coding and modulation scheme, as well as for spatial processing.
  • the channel estimate may be derived from a reference signal and/or channel condition feedback transmitted by the UE 350.
  • Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318TX.
  • Each transmitter 318TX may modulate an RF carrier with a respective spatial stream for transmission.
  • each receiver 354RX receives a signal through its respective antenna 352.
  • Each receiver 354RX recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor 356.
  • the TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions.
  • the RX processor 356 may perform spatial processing on the information to recover any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE 350, they may be combined by the RX processor 356 into a single OFDM symbol stream.
  • the RX processor 356 then converts the OFDM symbol stream from the time-domain to the frequency domain using a fast Fourier transform (FFT) .
  • FFT fast Fourier transform
  • the frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal.
  • the symbols on each subcarrier, and the reference signal are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station 310. These soft decisions may be based on channel estimates computed by the channel estimator 358.
  • the soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the base station 310 on the physical channel.
  • the data and control signals are then provided to the controller/processor 359, which implements layer 3 and layer 2 functionality.
  • the controller/processor 359 can be associated with a memory 360 that stores program codes and data.
  • the memory 360 may be referred to as a computer-readable medium.
  • the controller/processor 359 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the EPC 160.
  • the controller/processor 359 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.
  • the controller/processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression /decompression, and security (ciphering, deciphering, integrity protection, integrity verification) ; RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.
  • RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting
  • PDCP layer functionality associated with
  • Channel estimates derived by a channel estimator 358 from a reference signal or feedback transmitted by the base station 310 may be used by the TX processor 368 to select the appropriate coding and modulation schemes, and to facilitate spatial processing.
  • the spatial streams generated by the TX processor 368 may be provided to different antenna 352 via separate transmitters 354TX. Each transmitter 354TX may modulate an RF carrier with a respective spatial stream for transmission.
  • the UL transmission is processed at the base station 310 in a manner similar to that described in connection with the receiver function at the UE 350.
  • Each receiver 318RX receives a signal through its respective antenna 320.
  • Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to a RX processor 370.
  • the controller/processor 375 can be associated with a memory 376 that stores program codes and data.
  • the memory 376 may be referred to as a computer-readable medium.
  • the controller/processor 375 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the UE 350. IP packets from the controller/processor 375 may be provided to the EPC 160.
  • the controller/processor 375 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.
  • At least one of the TX processor 368, the RX processor 356, and the controller/processor 359 may be configured to perform aspects in connection with the combining component 198 and/or sharing component 199 of FIGURE 1. Additionally, at least one of the TX processor 316, the RX processor 370, and the controller/processor 375 may be configured to perform aspects in connection with combining component 198 and/or sharing component 199 of FIGURE 1.
  • FIGURE 4 is a diagram of a device-to-device (D2D) communications system 400, including V2X communications, in accordance with various aspects of the present disclosure.
  • the D2D communications system 400 may include V2X communications, (e.g., a first UE 450 communicating with a second UE 451) .
  • the first UE 450 and/or the second UE 451 may be configured to communicate in a licensed radio frequency spectrum and/or a shared radio frequency spectrum.
  • the shared radio frequency spectrum may be unlicensed, and therefore multiple different technologies may use the shared radio frequency spectrum for communications, including new radio (NR) , LTE, LTE-Advanced, licensed assisted access (LAA) , dedicated short range communications (DSRC) , MuLTEFire, 4G, and the like.
  • NR new radio
  • LAA licensed assisted access
  • DSRC dedicated short range communications
  • MuLTEFire 4G
  • 4G 4G
  • the D2D communications system 400 may use NR radio access technology. Of course, other radio access technologies, such as LTE radio access technology, may be used.
  • D2D communications e.g., V2X communications or vehicle-to-vehicle (V2V) communications
  • the UEs 450, 451 may be on networks of different mobile network operators (MNOs) . Each of the networks may operate in its own radio frequency spectrum.
  • MNOs mobile network operators
  • Each of the networks may operate in its own radio frequency spectrum.
  • the air interface to a first UE 450 e.g., Uu interface
  • the first UE 450 and the second UE 451 may communicate via a sidelink component carrier, for example, via the PC5 interface.
  • the MNOs may schedule sidelink communications between or among the UEs 450, 451 in licensed radio frequency spectrum and/or a shared radio frequency spectrum (e.g., 5 GHz radio spectrum bands) .
  • the shared radio frequency spectrum may be unlicensed, and therefore different technologies may use the shared radio frequency spectrum for communications.
  • a D2D communications (e.g., sidelink communications) between or among UEs 450, 451 is not scheduled by MNOs.
  • the D2D communications system 400 may further include a third UE 452.
  • the third UE 452 may operate on the first network 410 (e.g., of the first MNO) or another network, for example.
  • the third UE 452 may be in D2D communications with the first UE 450 and/or second UE 451.
  • the first base station 420 e.g., gNB
  • the first base station 420 may communicate with the third UE 452 via a downlink (DL) carrier 432 and/or an uplink (UL) carrier 442.
  • the DL communications may be use various DL resources (e.g., the DL subframes (FIGURE 2A) and/or the DL channels (FIGURE 2B) ) .
  • the UL communications may be performed via the UL carrier 442 using various UL resources (e.g., the UL subframes (FIGURE 2C) and the UL channels (FIGURE 2D) ) .
  • the first network 410 operates in a first frequency spectrum and includes the first base station 420 (e.g., gNB) communicating at least with the first UE 450, for example, as described in FIGURES 1-3.
  • the first base station 420 e.g., gNB
  • the first base station 420 may communicate with the first UE 450 via a DL carrier 430 and/or an UL carrier 440.
  • the DL communications may be use various DL resources (e.g., the DL subframes (FIGURE 2A) and/or the DL channels (FIGURE 2B) ) .
  • the UL communications may be performed via the UL carrier 440 using various UL resources (e.g., the UL subframes (FIGURE 2C) and the UL channels (FIGURE 2D) ) .
  • the second UE 451 may be on a different network from the first UE 450. In some aspects, the second UE 451 may be on a second network 411 (e.g., of the second MNO) .
  • the second network 411 may operate in a second frequency spectrum (e.g., a second frequency spectrum different from the first frequency spectrum) and may include the second base station 421 (e.g., gNB) communicating with the second UE 451, for example, as described in FIGURES 1-3.
  • the second base station 421 may communicate with the second UE 451 via a DL carrier 431 and an UL carrier 441.
  • the DL communications are performed via the DL carrier 431 using various DL resources (e.g., the DL subframes (FIGURE 2A) and/or the DL channels (FIGURE 2B) ) .
  • the UL communications are performed via the UL carrier 441 using various UL resources (e.g., the UL subframes (FIGURE 2C) and/or the UL channels (FIGURE 2D) ) .
  • the first base station 420 and/or the second base station 421 assign resources to the UEs for device-to-device (D2D) communications (e.g., V2X communications and/or V2V communications) .
  • D2D device-to-device
  • the resources may be a pool of UL resources, both orthogonal (e.g., one or more FDM channels) and non-orthogonal (e.g., code division multiplexing (CDM) /resource spread multiple access (RSMA) in each channel) .
  • CDM code division multiplexing
  • RSMA resource spread multiple access
  • the first base station 420 and/or the second base station 421 may configure the resources via the PDCCH (e.g., faster approach) or RRC (e.g., slower approach) .
  • each UE 450, 451 autonomously selects resources for D2D communications. For example, each UE 450, 451 may sense and analyze channel occupation during the sensing window. The UEs 450, 451 may use the sensing information to select resources from the sensing window. As discussed, one UE 451 may assist another UE 450 in performing resource selection. The UE 451 providing assistance may be referred to as the receiver UE or partner UE, which may potentially notify the transmitter UE 450. The transmitter UE 450 may transmit information to the receiving UE 451 via sidelink communications.
  • the D2D communications may be carried out via one or more sidelink carriers 470, 480.
  • the one or more sidelink carriers 470, 480 may include one or more channels, such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , and a physical sidelink control channel (PSCCH) , for example.
  • PSBCH physical sidelink broadcast channel
  • PSDCH physical sidelink discovery channel
  • PSSCH physical sidelink shared channel
  • PSCCH physical sidelink control channel
  • the sidelink carriers 470, 480 may operate using the PC5 interface.
  • the first UE 450 may transmit to one or more (e.g., multiple) devices, including to the second UE 451 via the first sidelink carrier 470.
  • the second UE 451 may transmit to one or more (e.g., multiple) devices, including to the first UE 450 via the second sidelink carrier 480.
  • the UL carrier 440 and the first sidelink carrier 470 may be aggregated to increase bandwidth.
  • the first sidelink carrier 470 and/or the second sidelink carrier 480 may share the first frequency spectrum (with the first network 410) and/or share the second frequency spectrum (with the second network 411) .
  • the sidelink carriers 470, 480 may operate in an unlicensed/shared radio frequency spectrum.
  • sidelink communications on a sidelink carrier may occur between the first UE 450 and the second UE 451.
  • the first UE 450 may perform sidelink communications with one or more (e.g., multiple) devices, including the second UE 451 via the first sidelink carrier 470.
  • the first UE 450 may transmit a broadcast transmission via the first sidelink carrier 470 to the multiple devices (e.g., the second and third UEs 451, 452) .
  • the second UE 451 (e.g., among other UEs) may receive such broadcast transmission.
  • the first UE 450 may transmit a multicast transmission via the first sidelink carrier 470 to the multiple devices (e.g., the second and third UEs 451, 452) .
  • the second UE 451 and/or the third UE 452 (e.g., among other UEs) may receive such multicast transmission.
  • the multicast transmissions may be connectionless or connection-oriented.
  • a multicast transmission may also be referred to as a groupcast transmission.
  • the first UE 450 may transmit a unicast transmission via the first sidelink carrier 470 to a device, such as the second UE 451.
  • the second UE 451 (e.g., among other UEs) may receive such unicast transmission.
  • the second UE 451 may perform sidelink communications with one or more (e.g., multiple) devices, including the first UE 450 via the second sidelink carrier 480.
  • the second UE 451 may transmit a broadcast transmission via the second sidelink carrier 480 to the multiple devices.
  • the first UE 450 (e.g., among other UEs) may receive such broadcast transmission.
  • the second UE 451 may transmit a multicast transmission via the second sidelink carrier 480 to the multiple devices (e.g., the first and third UEs 450, 452) .
  • the first UE 450 and/or the third UE 452 (e.g., among other UEs) may receive such multicast transmission.
  • the second UE 451 may transmit a unicast transmission via the second sidelink carrier 480 to a device, such as the first UE 450.
  • the first UE 450 (e.g., among other UEs) may receive such unicast transmission.
  • the third UE 452 may communicate in a similar manner.
  • such sidelink communications on a sidelink carrier between the first UE 450 and the second UE 451 may occur without having MNOs allocating resources (e.g., one or more portions of a resource block (RB) , slot, frequency band, and/or channel associated with a sidelink carrier 470, 480) for such communications and/or without scheduling such communications.
  • Sidelink communications may include traffic communications (e.g., data communications, control communications, paging communications and/or system information communications) .
  • sidelink communications may include sidelink feedback communications associated with traffic communications (e.g., a transmission of feedback information for previously-received traffic communications) .
  • Sidelink communications may employ at least one sidelink communications structure having at least one feedback symbol.
  • the feedback symbol of the sidelink communications structure may allot for any sidelink feedback information that may be communicated in the device-to-device (D2D) communications system 400 between devices (e.g., a first UE 450, a second UE 451, and/or a third UE 452) .
  • D2D device-to-device
  • a UE may be a vehicle (e.g., UE 450, 451) , a mobile device (e.g., 452) , or another type of device.
  • a UE may be a special UE, such as a road side unit (RSU) .
  • FIGURE 5 illustrates an example of a V2X system 500 with an RSU 510 according to aspects of the present disclosure.
  • a transmitter UE 504 transmits data to an RSU 510 and a receiving UE 502 via sidelink transmissions 512.
  • the RSU 510 may transmit data to the transmitter UE 504 via a sidelink transmission 512.
  • the RSU 510 may forward data received from the transmitter UE 504 to a cellular network (e.g., gNB) 508 via an UL transmission 514.
  • the gNB 508 may transmit the data received from the RSU 510 to other UEs 506 via a DL transmission 516.
  • the RSU 510 may be incorporated with traffic infrastructure (e.g., traffic light, light pole, etc. )
  • traffic infrastructure e.g., traffic light, light pole, etc.
  • the RSU 510 is a traffic signal positioned at a side of a road 520. Additionally or alternatively, RSUs 510 may be stand-alone units.
  • sidelink UEs When transmitting data, sidelink UEs first select resources for the transmission. Resources can be allocated to the UE via a system information block (SIB) or can be allocated via a dedicated configuration. For example, mobility control information can indicate a common resource pool or exceptional resource pool for transmitting V2X sidelink communications. In another example, upon receiving SIB types 21 or 26, the UE uses a common resource pool or an exceptional resource pool to transmit V2X sidelink communications. The UE also performs channel busy ratio (CBR) measurement on the indicated transmission resource pool (s) .
  • SIB system information block
  • CBR channel busy ratio
  • a traditional, normal resource pool is referred to as the common pool.
  • An exceptional resource pool was introduced for V2X communications to reduce service interruption. That is, exceptionally, a UE can autonomously switch from scheduled resource allocation mode to autonomous resource allocation mode by using resources from the exceptional resource pool under certain conditions, such as during cell reselection or handover.
  • CBR channel busy ratio
  • FIGURE 6 is a block diagram illustrating a user equipment (UE) with available transmission resource pools, in accordance with various aspects of the present disclosure.
  • a base station 602 allocates different resource pool information to the UE 604 based on a system information block (SIB) or a dedicated configuration.
  • SIB system information block
  • Tx transmit
  • V2X vehicle-to-everything
  • the UE can measure CBR information for each pool.
  • a UE It would be desirable for a UE to switch between the common Tx pool and the exceptional Tx pool based on congestion information, such as measured CBR information, for each pool.
  • congestion information such as measured CBR information
  • the UE only uses resources from a single pool.
  • the exceptional Tx pool is free when the UE is using the common Tx pool. If the result of sensing the resources of the common Tx pool indicates high congestion in the common pool, it would be desirable for the UE to be allowed to use the resources in the exceptional Tx pool to improve transmit efficiency.
  • a UE dynamically switches between the common Tx pool and the exceptional Tx pool based on the CBR of each pool. If the CBR of the common Tx pool is greater than one threshold (e.g., Tcommonhigh) and the CBR of the exceptional Tx pool is smaller than another threshold (e.g., Texceptionallow) , the UE uses the resources of the exceptional Tx pool.
  • one threshold e.g., Tcommonhigh
  • another threshold e.g., Texceptionallow
  • the UE uses the resources of the common Tx pool.
  • a threshold e.g., Texceptionalhigh
  • another threshold e.g., Tcommonlow
  • the UE switches back to the common Tx pool.
  • This other threshold is smaller than the Tcommonlow threshold, in one aspect of the present disclosure.
  • the UE switches to the common pool, even if the CBR of the exceptional pool is smaller than the threshold Texceptionalhigh. In other words, the UE switches back to the common pool when it is free.
  • the UE can decide to switch based on a random value.
  • the UE is aware of the large number by sensing congestion on each pool. If the pools are congested, a large number of users may be switching among pools. In this case, if the CBR of the common pool is greater than a threshold (e.g., Tcommonhigh) and the CBR of the exceptional pool is less than another threshold (e.g., Texceptionallow) , the UE generates a random value (e.g., between one and one hundred) . If the random value is greater than a threshold, the UE will use the resources of the exceptional Tx pool.
  • a threshold e.g., Tcommonhigh
  • Texceptionallow another threshold
  • This threshold is different than the other previously mentioned thresholds.
  • the above description refers to switching when the random value is above a threshold, the present disclosure also contemplates the case of switching when the random value is below the threshold.
  • the UE resumes transmitting with resources from the common Tx pool.
  • Switching from the exceptional pool to the common pool occurs when the exceptional pool CBR is high and the common pool CBR is low OR when a timer expires. This occurs because it is desirable to prevent the UE from staying in the exceptional Tx pool for a long period of time. The UE should stay in the common pool most of the time.
  • FIGURE 7 is a flow diagram illustrating an example process 700 for dynamically switching between resource pools, in accordance with various aspects of the present disclosure.
  • a sidelink UE senses resources of a common Tx pool. For example, the UE measures a CBR of the common Tx pool.
  • the UE senses resources of an exceptional Tx pool. For example, the UE measures a CBR of the exceptional Tx pool.
  • the CBRs are compared to thresholds. If the common Tx pool CBR is greater than a threshold and the exceptional Tx pool CBR is less than a different threshold (706: Yes) , transmission occurs with resources from the exceptional Tx pool at block 708. If the conditions in block 706 are not met (706: No) , the process continues to block 710.
  • the UE determines whether the common Tx pool CBR is less than a threshold and the exceptional Tx pool CBR is greater than another threshold. If so, the UE transmits with resources from the common Tx pool at block 712. Otherwise, the process ends.
  • a UE is given more opportunities to transmit data and guarantee the continuous transmission of data.
  • the present disclosure improves the successful transmission/re-transmission rate.
  • FIGURES 6-7 are provided as examples. Other examples may differ from what is described with respect to FIGURES 6-7.
  • the UE 120 for wireless communications includes means for sensing, means for switching, means for generating, means for transmitting, means for receiving.
  • Such means may include one or more components of the UE 120 described in connection with FIGURE 2.
  • FIGURE 8 is a flowchart 800 of a method of wireless communications.
  • the process 800 may include sensing congestion of transmission resources of a common pool for vehicle to everything (V2X) sidelink communications (block 802) .
  • the UE e.g. using the antenna 352, receiver 354, receive processor 356, controller processor 259, and/or memory 360
  • senses congestion e.g. using the antenna 352, receiver 354, receive processor 356, controller processor 259, and/or memory 360.
  • the process 800 may include sensing congestion of transmission resources of an exceptional pool for V2X sidelink communications (block 804) .
  • the UE e.g. using antenna 352, receiver 354, receive processor 356, controller processor 259, and/or memory 360
  • senses congestion e.g. using antenna 352, receiver 354, receive processor 356, controller processor 259, and/or memory 360.
  • the process 800 may include switching between transmission resources of the common pool and transmission resources of the exceptional pool when the sensing indicates a difference in congestion between the common pool and the exceptional pool (block 806) .
  • the UE e.g. using the antenna 352, transmitter 354, transmit processor 368, controller processor 259, and/or memory 360
  • switches between transmission resources e.g. using the antenna 352, transmitter 354, transmit processor 368, controller processor 259, and/or memory 360.
  • ком ⁇ онент is intended to be broadly construed as hardware, firmware, and/or a combination of hardware and software.
  • a processor is implemented in hardware, firmware, and/or a combination of hardware and software.
  • satisfying a threshold may, depending on the context, refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, and/or the like.
  • “at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c) .
  • the terms “has, ” “have, ” “having, ” and/or the like are intended to be open-ended terms. Further, the phrase “based on” is intended to mean “based, at least in part, on” unless explicitly stated otherwise.

Abstract

Un procédé par un EU (équipement utilisateur) en liaison latérale comprend la détection d'une congestion de ressources de transmission d'un groupement commun pour des communications sur liaison latérale de véhicule avec tout (V2X). Le procédé comprend également la détection d'une congestion de ressources de transmission d'un groupement exceptionnel pour des communications sur liaison latérale V2X. Le procédé comprend en outre la commutation entre des ressources de transmission du groupement commun et des ressources de transmission du groupement exceptionnel lorsque la détection indique une différence de congestion entre le groupement commun et le groupement exceptionnel.
PCT/CN2020/088539 2020-05-01 2020-05-01 Commutation dynamique entre des ressources de transmission de groupement commun et des ressources de transmission de groupement exceptionnel WO2021217679A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2020/088539 WO2021217679A1 (fr) 2020-05-01 2020-05-01 Commutation dynamique entre des ressources de transmission de groupement commun et des ressources de transmission de groupement exceptionnel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2020/088539 WO2021217679A1 (fr) 2020-05-01 2020-05-01 Commutation dynamique entre des ressources de transmission de groupement commun et des ressources de transmission de groupement exceptionnel

Publications (1)

Publication Number Publication Date
WO2021217679A1 true WO2021217679A1 (fr) 2021-11-04

Family

ID=78331705

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2020/088539 WO2021217679A1 (fr) 2020-05-01 2020-05-01 Commutation dynamique entre des ressources de transmission de groupement commun et des ressources de transmission de groupement exceptionnel

Country Status (1)

Country Link
WO (1) WO2021217679A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170366920A1 (en) * 2016-06-21 2017-12-21 Samsung Electronics Co., Ltd. System and method of reducing interruptions for vehicle to vehicle communication
US20190320415A1 (en) * 2016-10-26 2019-10-17 Lg Electronics Inc. Method for sensing resource for direct communication between terminals in wireless communication system and device therefor
CN110892765A (zh) * 2017-07-25 2020-03-17 Lg电子株式会社 在无线通信系统中在多个载波上执行侧链路传输的方法和设备

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170366920A1 (en) * 2016-06-21 2017-12-21 Samsung Electronics Co., Ltd. System and method of reducing interruptions for vehicle to vehicle communication
US20190320415A1 (en) * 2016-10-26 2019-10-17 Lg Electronics Inc. Method for sensing resource for direct communication between terminals in wireless communication system and device therefor
CN110892765A (zh) * 2017-07-25 2020-03-17 Lg电子株式会社 在无线通信系统中在多个载波上执行侧链路传输的方法和设备

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
FUJITSU: "Discussion on QoS management for NR sidelink", 3GPP DRAFT; R1-1906443 DISCUSSION ON QOS MANAGEMENT FOR NR SIDELINK, vol. RAN WG1, 30 April 2019 (2019-04-30), Reno, USA, pages 1 - 3, XP051708478 *
FUJITSU: "Resource Allocation for NR V2X Sidelink Communication", 3GPP DRAFT; R1-1812410, vol. RAN WG1, 16 November 2018 (2018-11-16), Spokane USA, pages 1 - 9, XP051478610 *
ZTE; ZTE MICROELECTRONICS: "Remaining details of congestion control for PC5-based V2X", 3GPP DRAFT; R1-1701622 - 7.2.1.3 REMAINING DETAILS OF CC FOR PC5-BASED V2X, vol. RAN WG1, 6 February 2017 (2017-02-06), Athens, Greece, pages 1 - 4, XP051220512 *

Similar Documents

Publication Publication Date Title
US11916726B2 (en) Network assisted sidelink beam failure recovery
US11582720B2 (en) Vehicle-to-everything (V2X) inter-user equipment (UE) coordination
US11778572B2 (en) Lite SL-SS (sidelink synchronization signal) transmission for on demand S-SSB (sidelink synchronization signal block)
US20220006505A1 (en) Sidelink beam failure recovery
US20210368466A1 (en) Demand and response for sidelink synchronization signal block (s-ssb) transmission
EP4176521A1 (fr) Détection de défaillance de faisceau directionnel de liaison latérale (sl)
US11729808B2 (en) Sidelink FR2 inter-UE interference management
US11930480B2 (en) Reduced sensing procedure for sidelink communications
US11831572B2 (en) Vehicle-to-everything (V2X) inter-user equipment (UE) coordination
US11540224B2 (en) Vehicle-to-everything (V2X) inter-user equipment (UE) coordination
US20220039145A1 (en) User equipment (ue) assisted uplink (ul) transmission
US11950184B2 (en) Zone identification (ID) for wireless sidelink communications
US11723012B2 (en) Vehicle-to-everything (V2X) destination identification sharing for inter-user equipment (UE) coordination
US20220225072A1 (en) Sidelink radio resource management using sidelink discovery signal
EP4238367A1 (fr) Rapport multi-accès à des informations d'occupation de canal
WO2021217679A1 (fr) Commutation dynamique entre des ressources de transmission de groupement commun et des ressources de transmission de groupement exceptionnel
WO2023123007A1 (fr) Réservation de surface intelligente reconfigurable (ris) pour des communications de liaison latérale
WO2022036487A1 (fr) Résolution d'une inadaptation d'état de contrôle de ressources radio (rrc) pour des transmissions de véhicule à tout (v2x)

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20933331

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20933331

Country of ref document: EP

Kind code of ref document: A1