WO2020142987A1 - Procédé et dispositif pour envoyer et recevoir des informations de liaison latérale - Google Patents

Procédé et dispositif pour envoyer et recevoir des informations de liaison latérale Download PDF

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Publication number
WO2020142987A1
WO2020142987A1 PCT/CN2019/071183 CN2019071183W WO2020142987A1 WO 2020142987 A1 WO2020142987 A1 WO 2020142987A1 CN 2019071183 W CN2019071183 W CN 2019071183W WO 2020142987 A1 WO2020142987 A1 WO 2020142987A1
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Prior art keywords
time
side link
resource
code block
frequency resource
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PCT/CN2019/071183
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English (en)
Chinese (zh)
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张健
纪鹏宇
李国荣
张磊
王昕�
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富士通株式会社
张健
纪鹏宇
李国荣
张磊
王昕�
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Priority to PCT/CN2019/071183 priority Critical patent/WO2020142987A1/fr
Publication of WO2020142987A1 publication Critical patent/WO2020142987A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • Embodiments of the present invention relate to the field of communication technologies, and in particular, to a method and apparatus for sending and receiving side link information.
  • V2X Vehicle to Everything
  • the sending device in V2X can directly communicate with the receiving device through a sidelink.
  • the side link is a newly defined air interface for V2X (air interface between V2X devices), and the side link can use the cellular network Uu link frequency resources can also use dedicated frequency resources.
  • the side link transmits control information through a physical side link control channel (PSCCH, Physical Sidelink Control Channel), and transmits data information through a physical side link shared channel (PSSCH, Physical Side Link Shared Channel).
  • PSCCH Physical Sidelink Control Channel
  • PSSCH Physical Side Link Shared Channel
  • New Radio (NR, New Radio) V2X is one of the current Rel-16 standardization research projects. Compared with LTE V2X, NR V2X needs to support many new scenarios and new services (such as remote driving, autonomous driving and fleet driving, etc.), Need to meet higher technical indicators (high reliability, low latency, high data rate, etc.). To meet the needs of different scenarios and different services, in addition to broadcasting, NR V2X also needs to provide support for unicast and multicast.
  • the transmission/retransmission based on the code block group (CBG, Code Block) is a new information transmission technology introduced by NR Rel-15, and the traditional transmission/retransmission based on the transmission block (TB) in LTE
  • CBG-based transmission/retransmission groups the code blocks included in the TB, that is, dividing a TB into several CBGs; accordingly, hybrid automatic repeat request (HARQ, Hybrid Automatic Repeat) reQuest feedback Information (such as ACK/NACK) is fed back in CBG units, not in TB units.
  • HARQ Hybrid Automatic Repeat
  • CBG-based transmission/retransmission is simply referred to as CBG-based transmission.
  • CBG-based transmission when a transmission error occurs in part of the CBG in the TB (that is, it is not correctly received), the network device only needs to retransmit the part of the CBG, and does not need to retransmit the entire TB, so the retransmission overhead can be reduced.
  • CBG-based transmission is the transmission technology of the Uu link in NR Rel-15, and that supporting CBG-based transmission in the NR V2X side link is also of positive significance.
  • CNR-based transmission is currently not supported in NR V2X, and the retransmission overhead of side link transmission cannot be further reduced.
  • embodiments of the present invention provide a method and apparatus for sending and receiving side link information.
  • a method for transmitting side link information including:
  • the first device determines the first time-frequency resource for transmitting side link information
  • the first device uses the first time-frequency resource and sends the side link information to the second device based on the code block group.
  • an apparatus for transmitting side link information including:
  • a determining unit which determines a first time-frequency resource for transmitting side link information
  • a sending unit that uses the first time-frequency resource and sends the side link information to the second device based on the code block group.
  • a method for receiving side link information including:
  • the second device determines a second time-frequency resource for receiving side link information
  • the second device uses the second time-frequency resource and receives the side link information sent by the first device based on the code block group.
  • an apparatus for receiving side link information including:
  • a determining unit that determines a second time-frequency resource for receiving side link information
  • a receiving unit that uses the second time-frequency resource and receives the side link information sent by the first device based on the code block group.
  • a communication system including:
  • a first device that determines a first time-frequency resource for sending side link information, uses the first time-frequency resource and sends the side link information based on a code block group;
  • a second device that determines a second time-frequency resource for receiving the side link information, uses the second time-frequency resource and receives the side link information based on a code block group.
  • the first device determines the first time-frequency resource for sending the side link information; and using the first time-frequency resource and based on the code block group (CBG) to the second device Send the side link information. Therefore, CBG-based transmission is supported in NR V2X, which not only can more flexibly support multiplexing of different services of V2X, but also can further reduce the retransmission overhead of V2X.
  • CBG code block group
  • FIG. 1 is a schematic diagram of a communication system according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a method for transmitting side link information according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of side link resources according to an embodiment of the present invention.
  • FIG. 4 is another schematic diagram of a side link resource according to an embodiment of the invention.
  • FIG. 5 is another schematic diagram of side link resources according to an embodiment of the present invention.
  • FIG. 6 is another schematic diagram of a side link resource according to an embodiment of the invention.
  • FIG. 7 is another schematic diagram of a side link resource according to an embodiment of the present invention.
  • FIG. 8 is another schematic diagram of a side link resource according to an embodiment of the invention.
  • FIG. 9 is another schematic diagram of a side link resource according to an embodiment of the present invention.
  • FIG. 10 is another schematic diagram of side link resources according to an embodiment of the present invention.
  • FIG. 11 is another schematic diagram of side link resources according to an embodiment of the present invention.
  • FIG. 12 is a schematic diagram of multiple devices performing side-link resource multiplexing according to an embodiment of the present invention.
  • FIG. 13 is another schematic diagram of multiple devices performing multiplexing of side link resources according to an embodiment of the present invention.
  • FIG. 14 is another schematic diagram of multiple devices performing multiplexing of side link resources according to an embodiment of the present invention.
  • 15 is another schematic diagram of a side link resource according to an embodiment of the present invention.
  • 16 is another schematic diagram of a side link resource according to an embodiment of the present invention.
  • FIG. 17 is another schematic diagram of a side link resource according to an embodiment of the present invention.
  • FIG. 18 is another schematic diagram of a side link resource according to an embodiment of the invention.
  • FIG. 19 is a schematic diagram of resource pool configuration according to an embodiment of the present invention.
  • 20 is another schematic diagram of a side link resource according to an embodiment of the present invention.
  • 21 is another schematic diagram of a side link resource according to an embodiment of the present invention.
  • 22 is another schematic diagram of a side link resource according to an embodiment of the invention.
  • FIG. 23 is a schematic diagram of a method for receiving side link information according to an embodiment of the present invention.
  • 24 is a schematic diagram of an apparatus for sending side link information according to an embodiment of the present invention.
  • 25 is a schematic diagram of an apparatus for receiving side link information according to an embodiment of the present invention.
  • 26 is a schematic diagram of a network device according to an embodiment of the present invention.
  • FIG. 27 is a schematic diagram of a terminal device according to an embodiment of the present invention.
  • the terms “first”, “second”, etc. are used to distinguish different elements in terms of titles, but do not mean the spatial arrangement or chronological order of these elements, and these elements should not be used by these terms Restricted.
  • the term “and/or” includes any and all combinations of one or more of the associated listed terms.
  • the terms “comprising”, “including”, “having” and the like refer to the stated features, elements, elements or components, but do not exclude the presence or addition of one or more other features, elements, elements or components.
  • the term “communication network” or “wireless communication network” may refer to a network that conforms to any of the following communication standards, such as Long Term Evolution (LTE, Long Term Evolution), Enhanced Long Term Evolution (LTE-A, LTE- Advanced), wideband code division multiple access (WCDMA, Wideband Code Division Multiple Access), high-speed message access (HSPA, High-Speed Packet Access) and so on.
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution
  • LTE-A Long Term Evolution-A
  • LTE- Advanced wideband code division multiple access
  • WCDMA Wideband Code Division Multiple Access
  • High-speed message access High-Speed Packet Access
  • the communication between devices in the communication system can be performed according to any stage of the communication protocol, for example, it can include but is not limited to the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G, and 5G , New Radio (NR, New Radio), etc., and/or other communication protocols currently known or to be developed in the future.
  • 1G generation
  • 2G 2.5G
  • 2.75G 3G
  • 5G New Radio
  • NR, New Radio New Radio
  • Network device refers to, for example, a device that connects a terminal device to a communication network and provides services for the terminal device in a communication system.
  • Network equipment may include but is not limited to the following equipment: base station (BS, Base Station), access point (AP, Access Point), transmission and reception point (TRP, Transmission Reception Point), broadcast transmitter, mobile management entity (MME, Mobile Management), gateway, server, radio network controller (RNC, Radio Network Controller), base station controller (BSC, Base Station Controller), etc.
  • the base station may include but is not limited to: Node B (NodeB or NB), evolved Node B (eNodeB or eNB) and 5G base station (gNB), etc., and may also include a remote radio head (RRH, Remote Radio Head) , Remote Radio Unit (RRU, Remote Radio Unit), relay (relay) or low power node (such as femeto, pico, etc.).
  • NodeB Node B
  • eNodeB or eNB evolved Node B
  • gNB 5G base station
  • RRH Remote Radio Head
  • RRU Remote Radio Unit
  • relay relay
  • low power node such as femeto, pico, etc.
  • base station may include some or all of their functions, and each base station may provide communication coverage for a specific geographic area.
  • the term "cell” may refer to a base station and/or its coverage area, depending on the context in which the term is used.
  • the term "user equipment” (UE, User Equipment) or “terminal equipment” (TE, Terminal Equipment or Terminal Device) refers to, for example, a device that accesses a communication network through a network device and receives network services.
  • the terminal equipment may be fixed or mobile, and may also be called a mobile station (MS, Mobile Station), terminal, subscriber station (SS, Subscriber Station), access terminal (AT, Access Terminal), station, and so on.
  • terminal devices may include but are not limited to the following devices: cellular phones (Cellular), personal digital assistants (PDA, Personal Digital Assistant), wireless modems, wireless communication devices, handheld devices, machine-type communication devices, laptop computers, Cordless phones, smart phones, smart watches, digital cameras, etc.
  • Cellular Cellular
  • PDA Personal Digital Assistant
  • wireless modems wireless communication devices
  • handheld devices machine-type communication devices
  • laptop computers Cordless phones
  • smart phones smart watches, digital cameras, etc.
  • the terminal device may also be a machine or device that performs monitoring or measurement.
  • the terminal device may include, but is not limited to: machine type communication (MTC, Machine Type Communication) terminal, Vehicle-mounted communication terminals, device-to-device (D2D, Device to Device) terminals, machine-to-machine (M2M, Machine to Machine) terminals, and so on.
  • MTC Machine Type Communication
  • D2D Device to Device
  • M2M Machine to Machine
  • network side or “network device side” refers to a side of the network, which may be a certain base station or may include one or more network devices as above.
  • user side or “terminal side” or “terminal device side” refers to the side of the user or terminal, which may be a certain UE or may include one or more terminal devices as above.
  • device can refer to either a network device or a terminal device.
  • FIG. 1 is a schematic diagram of a communication system according to an embodiment of the present invention, and schematically illustrates a case where a terminal device and a network device are taken as an example.
  • the communication system 100 may include a network device 101 and terminal devices 102, 103.
  • FIG. 1 only uses two terminal devices and one network device as examples, but the embodiment of the present invention is not limited thereto.
  • the network device 101 and the terminal devices 102 and 103 may perform existing service or service transmission that can be implemented in the future.
  • these services may include, but are not limited to: enhanced mobile broadband (eMBB, enhanced Mobile Broadband), large-scale machine type communication (mMTC, massive Machine Type Communication), and highly reliable low-latency communication (URLLC, Ultra-Reliable and Low -Latency Communication), etc.
  • FIG. 1 shows that both terminal devices 102 and 103 are within the coverage of the network device 101, but the present invention is not limited to this. Neither terminal device 102, 103 may be within the coverage of the network device 101, or one terminal device 102 may be within the coverage of the network device 101 and the other terminal device 103 may be outside the coverage of the network device 101.
  • side link transmission can be performed between the two terminal devices 102 and 103.
  • both terminal devices 102 and 103 may perform side-link transmission within the coverage of the network device 101 to realize V2X communication, or may perform side-link transmission outside the coverage of the network device 101 to achieve V2X.
  • one terminal device 102 is within the coverage of the network device 101 and the other terminal device 103 performs side-chain transmission outside the coverage of the network device 101 to achieve V2X communication.
  • Embodiments of the present invention provide a solution for supporting CBG-based transmission in NR V2X.
  • the embodiment of the present invention can configure or pre-configure whether to use CBG based on the NR V2X resource pool.
  • the transmission can support the multiplexing of V2X different services more flexibly.
  • the embodiments of the present invention can determine the number of CBGs and the size (or size of CBGs) based on the physical resource mapping information, which can match channel conditions to the greatest extent, thereby reducing retransmission overhead.
  • An embodiment of the present invention provides a method for sending side link information, which will be described from the first device side.
  • the first device communicates with the second device on the side link;
  • the first device may be a terminal device, but the present invention is not limited to this, for example, it may also be a roadside device or a network device, hereinafter the first device and the second device
  • the terminal devices are taken as examples for description.
  • FIG. 2 is a schematic diagram of a method for transmitting side link information according to an embodiment of the present invention. As shown in FIG. 2, the method includes:
  • Step 201 The first device determines the first time-frequency resource for sending side link information
  • Step 202 The first device uses the first time-frequency resource and sends the side link information to the second device based on a code block group (CBG).
  • CBG code block group
  • FIG. 3 is a schematic diagram of side link resources according to an embodiment of the present invention.
  • NR V2X can also consider supporting preemption and CBG-based transmission.
  • the services of UE1 and UE2 have lower priority than the services of UE3, for example, they have looser reliability and/or delay requirements, so UE3 can preempt UE1 and UE. 2 time-frequency resources are transmitted. Since some resources of UE1 and UE2 are preempted by UE3, the transmission of the corresponding code block of that part will fail, but not necessarily the entire TB transmission failure. Therefore, if UE1 and UE2 use CBG-based transmission, the weight will be reduced. Transmission overhead.
  • the first time-frequency resource is configured or pre-configured to the first device, and is configured or pre-configured to be based on a code block group (CBG).
  • CBG code block group
  • the first time-frequency resource is one or more resources in a resource pool or a part of bandwidth (BWP, BandWidth Part).
  • NR V2X can define a sending resource pool and a receiving resource pool. In the embodiment of the present invention, they are collectively referred to as a resource pool.
  • the resource pool is composed of several time slots in the time domain and several resource blocks (RB, Resource) in the frequency domain.
  • RB resource blocks
  • the definition and configuration method of the resource pool can follow the LTE V2X standard, for example, based on section 14.1.5 of TS 36.213, and replace "subframe" with "slot".
  • a resource pool For a resource pool, if the time-frequency resources in the resource pool are not allowed to be preempted, configuring (or pre-configuring) and using CBG-based transmission for the resource pool cannot obtain the benefit of reducing retransmission overhead, so resources can be used Whether the pool is configured for a unit or pre-configured to use CBG-based transmission.
  • one or more (eg, each) resource pool or partial bandwidth (BWP) of the first device is configured or pre-configured based on code block group (CBG).
  • the resource pool or partial bandwidth (BWP) can be configured based on code block group (CBG) by at least one of the following: radio resource control (RRC, Radio Resource Control) signaling, system information (SI, System Information) , Sidelink control information (SCI, Sidelink Control Information), downlink control information (DCI, Downlink Control Information); but the invention is not limited to this.
  • RRC Radio Resource Control
  • SI System Information
  • SCI Sidelink control information
  • DCI Downlink Control Information
  • the first resource pool its resources may be preempted, so the first resource pool may be configured or pre-configured to use CBG-based transmission; for the second resource pool, if it can be known in advance that its resources will not be preempted , The second resource pool may be configured or pre-configured to use TB-based transmission, that is, the second resource pool does not use CBG-based transmission.
  • configuration can be used when the device is in a network coverage area, and the device can receive network configuration information, for example, through at least one of system information (MIB/SIB), RRC signaling, DCI, and SCI.
  • Pre-configuration can be used when the device is out of network coverage (out-of-coverage). The device performs V2X communication according to the pre-configuration (that is, the default configuration or the factory configuration or the configuration specified by the standard).
  • the term “configuration” is used later in this article, including the two implementations of "configuration” and “preconfiguration” mentioned above.
  • the device For a resource pool that is configured or pre-configured to use CBG-based transmission, when the resource pool is a sending resource pool, the device uses CBG-based transmission when sending information in the resource pool, and when the resource pool is a receiving resource pool, the device When receiving information in the resource pool, it is considered that the information uses CBG-based transmission when it is sent.
  • NR V2X may consider using a shorter transmission time interval (TTI, Transmission Time Interval).
  • TTI Transmission Time Interval
  • Shorter TTI can be achieved by using a larger sub-carrier spacing (ie different numerology), or by using min-slot-based transmission.
  • the channel conditions within a longer TTI may also change significantly, resulting in transmission errors in some code blocks in a TB, so it is necessary to support CBG-based transmission to reduce retransmission overhead .
  • multiplexing may refer to multiplexing on non-overlapping time-frequency resources or multiplexing on overlapping time-frequency resources.
  • FIG. 4 is another schematic diagram of a side link resource according to an embodiment of the present invention.
  • UE1 and UE2 use different numerology, or UE1 uses slot-based transmission, and UE2 uses small-slot-based transmission, so UE2 has a shorter TTI than UE1 Length
  • Figure 4 assumes that UE 1 and UE 2 use partially overlapping time-frequency resources (RB to m to RB) for information transmission, so UE 2 will cause interference to UE 1. Since the information sent in each TTI of UE2 is independent, the interference intensity received by UE1 in a TTI will change, which is also a manifestation of the change in channel conditions. Therefore, if UE1 uses CBG-based transmission, it can be Reduce retransmission overhead.
  • FIG. 5 is another schematic diagram of a side link resource according to an embodiment of the present invention.
  • UE1 and UE2 are frequency-division multiplexed.
  • UE2 does not interfere with UE1, but because UE2's frequency falls within UE1's BWP, UE1's received power in a TTI will be affected UE2 changes due to the influence of UE2, which leads to inaccurate estimation of Automatic Gain Control (AGC) for UE1.
  • AGC Automatic Gain Control
  • UE1 estimates AGC based on the first symbol in the TTI, but the channel conditions in the TTI change significantly, so the above AGC estimation does not apply to the entire TTI. This will cause a demodulation error in some code blocks of UE1, so UE1 can use CBG-based transmission to reduce retransmission overhead.
  • AGC Automatic Gain Control
  • the resource pool in V2X has a one-to-one correspondence with numerology, and a resource pool will correspond to a numerology that can be used. If the first resource pool is not multiplexed with other resource pools with different numerology, the first resource pool does not actually need to use CBG-based transmission. Therefore, whether to use CBG-based transmission can be configured in units of resource pools. This configuration provides greater flexibility.
  • resource pools that are not multiplexed with different numerology can be configured to use TB-based transmission.
  • a resource pool using a longer slot length can be configured to use CBG-based transmission;
  • a resource pool using a shorter slot length can be configured to use TB-based Transmission.
  • the shorter time slot length may not cause a significant change in channel conditions within a time slot.
  • the resource pool where UE 2 is located does not experience a significant change in channel conditions within a time slot.
  • the TTI of UE 1 is equal to small time slot 1
  • the TTI of UE 2 is equal to small time slot 2. The above method is also applicable and will not be repeated.
  • NR V2X In addition to broadcasting, NR V2X also needs to provide support for unicast and multicast. 3GPP has agreed that NR V2X supports HARQ feedback for unicast and multicast, and defines a new physical channel-Physical Sidelink Feedback Channel (PSFCH, Physical Sidelink Feedback Channel) to carry HARQ feedback information and/or CSI.
  • PSFCH Physical Sidelink Feedback Channel
  • the PSFCH may not occupy the entire time slot, so it may cause a significant change in the channel conditions within a time slot, thereby causing transmission errors in some code blocks in a TB. Therefore, CBG-based transmission can be used to reduce retransmission overhead.
  • the side link information includes information carried by at least one of the following channels: physical side link control channel (PSCCH), physical side link shared channel (PSSCH), physical side link feedback channel (PSFCH).
  • PSCCH physical side link control channel
  • PSSCH physical side link shared channel
  • PSFCH physical side link feedback channel
  • FIG. 6 is another schematic diagram of a side link resource according to an embodiment of the present invention, and provides an example of multiplexing PSCCH, PSSCH, and PSFCH in a time slot.
  • This multiplexing method is beneficial to meet the requirements of low-latency services.
  • UE1 can receive the PSCCH and PSSCH from UE2 in the time slot, and send HARQ feedback information to UE2 through the PSFCH in the same time slot. Since PSCCH and PSSCH are sent by UE2 and PSFCH is sent by UE1, independent AGC estimation is required.
  • AGC 1 symbol is used for AGC estimation of PSCCH and PSSCH
  • AGC 2 symbol is used for AGC estimation of PSFCH
  • the GUARD 2 symbol is used as a guard interval for receiving/transmitting conversion between PSCCH/PSSCH and PSFCH
  • the GUARD 1 symbol is used as a guard interval for receiving/transmitting conversion between time slots and time slots.
  • the AGC and GUARD in Figure 6 are located in different symbols.
  • the time slot structure shown in FIG. 6 is not limited to a scenario that supports a certain device to receive data information and send HARQ feedback information in the same time slot.
  • UE1 only needs to send HARQ feedback information and/or CSI to UE2 through PSFCH
  • UE3 only needs to send data information to UE4 through PSCCH/PSSCH
  • UE1 and UE3 can follow Figure 6 Multiplexing of PSFCH and PSCCH/PSSCH.
  • UE5 needs to send data information to UE6, and needs to send HARQ feedback information to UE7
  • PSCCH/PSSCH and PSFCH sent to UE6 and UE7 can be multiplexed as shown in FIG. 6
  • PSCCH, PSSCH, and PSFCH sent by different devices or sent to different devices can be multiplexed in the same time slot, thereby improving spectrum utilization.
  • FIG. 7 is another schematic diagram of the side link resource according to the embodiment of the present invention, and an example in this case is given, in which GUARD 1 and AGC 1 are located in the first symbol of the time slot, within the time of one symbol It can not only complete the reception/transmission conversion between time slots and time slots, but also complete the AGC estimation of PSCCH and PSSCH.
  • GUARD 2 and AGC 2 are located in the previous symbol of PSFCH, and can complete PSCCH in one symbol time
  • the reception/transmission conversion between /PSSCH and PSFCH can also complete the AGC estimation of PSFCH.
  • Figures 6 and 7 can be unified and abstract.
  • FIG. 8 is another schematic diagram of a side link resource according to an embodiment of the present invention, omitting the AGC symbol and the GUARD guard interval.
  • the AGC and GUARD structures of FIG. 8 can follow either of FIG. 6 or FIG. 7.
  • FIG. 8 does not have any restrictions on the relative positions of PSCCH/PSSCH and PSFCH in frequency, that is, PSCCH/PSSCH and PSFCH may completely overlap, partially overlap, or not overlap at all in frequency.
  • FIG. 9 is another schematic diagram of the side link resource according to an embodiment of the present invention, and shows that the PSCCH/PSSCH and PSFCH are completely coincident in frequency
  • FIG. 10 is another schematic diagram of the side link resource according to the embodiment of the present invention. The case where PSCCH/PSSCH and PSFCH partially overlap in frequency is shown
  • FIG. 11 is another schematic diagram of a side link resource according to an embodiment of the present invention, showing the case where PSCCH/PSSCH and PSFCH do not coincide completely in frequency.
  • orthogonal frequency division multiplexing OFDM, Orthogonal Frequency Division Multiplex
  • SC-FDMA Single-carrier Frequency Division Multiple Access
  • discrete Fourier transform can be used to extend orthogonality Frequency division multiplexing (DFT-s-OFDM, Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplex) and other waveforms, so the above symbols can be OFDM symbols or SC-FDMA symbols or DFT-s-OFDM symbols, etc., hereinafter referred to as symbols; but The invention is not limited to this.
  • the above PSFCH physical structure may cause a significant change in the channel conditions within a time slot, which will be explained below through several examples.
  • FIG. 12 is a schematic diagram of multiple devices performing multiplexing of side link resources according to an embodiment of the present invention.
  • UE1 sends PSCCH1 and PSSCH1 to UE2, and UE2 sends HARQ feedback information to UE1 through PSFCH2 in the same time slot.
  • V2X devices can be multiplexed in a set of overlapping time-frequency resources
  • UE3 can send PSCCH3 and PSSCH3 to UE4 within the same time-frequency resources as UE1 and UE2. For example, UE3 thinks through sensing The entire time slot can be used to send information.
  • UE 4 receives interference from PSCCH 1/PSSCH 1 sent by UE 1 in time slot k and interference from PSFCH 2 sent by UE 2 in time slot 2 They are independent of each other, and the interference intensity may be very different.
  • the change in interference intensity is a manifestation of changes in channel conditions.
  • UE1 to UE4 are driving in the same direction in a lane. Because UE2 is closer to UE4, part 2 of UE4 is subject to strong interference. Because UE2 and UE4 are blocked by UE2, Therefore, part 1 of UE 4 receives less interference. Although UE3 will perceive before sending information, because it is far away from UE4, it cannot accurately perceive the interference environment where UE4 is located, that is, hidden node problem, or UE3 judges that the time slot is available by sensing at the beginning of the time slot However, because it cannot predict that the time slot part 2 will have strong interference, UE 3 may still send information in this time slot.
  • FIG. 13 is another schematic diagram of multiple devices performing multiplexing of side link resources according to an embodiment of the present invention.
  • UE3 uses the entire time slot to send PSCCH3 and PSSCH3 to UE4. Since different devices can be reused in a set of overlapping time-frequency resources, other UEs can send and receive data within the overlapping time-frequency resources (RB to m, RB, time slot k).
  • UE 2 transmits the HARQ feedback information and/or CSI through PSFCH 2 in RB to m and part 2 of time slot k.
  • UE 1 can control the side link control information (SCI, Sidelink Control) by sensing or by demodulation Information)
  • SCI Sidelink Control
  • UE 1 can send PSCCH 1 and PSSCH 1 in part 1 of time slot k.
  • part 1 and part 2 of time slot k are subject to interference from different devices of UE 1 and UE 2, respectively, so the interference intensity may change significantly.
  • FIG. 14 is another schematic diagram of multiple devices performing multiplexing of side link resources according to an embodiment of the present invention.
  • UE1 uses the entire time slot to send PSCCH1 and PSSCH1 to UE2, and it shares the same set of overlapping time-frequency resources with a group of V2X devices that perform multicast (groupcast) communication, that is, from RB to m Within RB, UE 3 sends information to a group of devices from UE 4 to UE N in a multicast manner.
  • groupcast multicast
  • multiple devices using the same PSFCH resource to send HARQ feedback information is a method that can efficiently use resources, which can avoid allocating dedicated PSFCH resources to each device, thereby greatly saving feedback resource overhead. It is possible to feed back only NACK and not ACK. When multiple devices use the same resource to send NACK, the superimposed signals will produce a signal enhancement effect, which is conducive to the reliable reception of feedback information. However, while the above method enhances the feedback signal, it also enhances interference to other devices.
  • UE 4 to UE N receive multicast data in a time slot before time slot k, and send NACK in part 2 of time slot k. Due to the superposition of multiple UE signals, it may be possible for UE 2 to time slot k The part 2 of the UE generates greater interference, so that the interference intensity of the part 1 and part 2 of the UE 2 changes significantly.
  • UE1 may not know the existence of multicast feedback by blindly detecting the SCI of UE3 or by sensing and other reasons due to hidden nodes, etc. Therefore, it is impossible to avoid scheduling UE2 to receive data on the same time-frequency resources.
  • Figures 12 to 14 are only given as schematics. For simplicity, Figures 12 to 14 assume that the number of RBs occupied by the PSFCH/PSSCH interfered with by the PSFCH is the same as the number of RBs occupied by the PSFCH as the interference source. The number of RBs may also be different, as long as there are overlapping RBs in the frequency domain, the above interference analysis and the impact on AGC are still valid, and are not listed one by one.
  • FIG. 15 is another schematic diagram of a side link resource according to an embodiment of the present invention.
  • a PSCCH1 and PSSCH1 that a device wants to receive in a certain time slot, there may be information transmission and reception between other devices in the overlapping time-frequency resources, such as PSCCH2/PSSCH2, PSFCH3, PSCCH4/PSSCH4, PSFCH5, etc.
  • the information carried by these physical channels can come from different devices, and the interference of PSCCH1/PSSCH1 in a time slot will change. Interference changes are a manifestation of changes in channel conditions. As mentioned earlier, this will cause transmission errors in some code blocks within a TB. Therefore, CBG-based transmission can be used to reduce retransmission overhead.
  • a change in interference within a time slot is one cause of changes in channel conditions.
  • Another cause may be a change in signal energy (or power).
  • FIG. 16 is another schematic diagram of a side link resource according to an embodiment of the present invention.
  • the physical channels or signals of PSCCH1/PSSCH1 and other devices such as PSCCH2/PSSCH2, PSFCH3, PSCCH4/PSSCH4, PSFCH5, etc., the number of RBs occupied by these physical channels can be different
  • PSCCH1/PSSCH1 and other devices such as PSCCH2/PSSCH2, PSFCH3, PSCCH4/PSSCH4, PSFCH5, etc., the number of RBs occupied by these physical channels can be different
  • the signal energy received by the receiving device in the time slot is the sum of all physical channels and/or signal energy of frequency division multiplexing. Since there are signals from different devices in the time slot, the energy of the time-domain signal received by the PSCCH1/1/PSSCH1 receiving device will change in the time slot.
  • FIGS. 12 to 14 can be easily extended to the frequency division multiplexing scene shown in FIG. 16 to illustrate the change in signal energy in the time slot, and will not be repeated one by one.
  • a change in received signal energy or power is a manifestation of changes in channel conditions.
  • the channel conditions due to the introduction of PSFCH physical channels by NR V2X, the channel conditions (signal and/or interference strength) may change significantly even within a time slot due to PSFCH multiplexing.
  • FIG. 17 is another schematic diagram of a side link resource according to an embodiment of the present invention.
  • the signal and/or interference strength of the first part and the second part in the time slot may be completely different.
  • the second part/first part is subject to greater interference, or because the AGC estimation of the second part/first part is inaccurate, resulting in the failure of TB demodulation and decoding in this time slot, Then according to the HARQ mechanism, the entire TB will be retransmitted.
  • the first part and the second part may belong to different CBGs. If the corresponding CBG demodulation and decoding fails due to a part of the first part and the second part, then only The CBG corresponding to this part needs to be retransmitted without retransmitting the entire TB, which can greatly save the retransmission overhead.
  • FIG. 18 is another schematic diagram of a side link resource according to an embodiment of the present invention, which is illustrated by taking two CBGs as an example.
  • the first part and the second part of the time slot belong to CBG#1 and CBG#2, respectively.
  • the dividing line between the first part and the second part does not necessarily coincide with the dividing line of CBG#1 and CBG#2.
  • CBG#1 demodulate and decode correctly, but due to strong interference of PSFCH such as multicast under the second part, CBG#2 demodulation and decoding fails, you only need to retransmit CBG#2, without retransmission including CBG The entire TB of #1 and CBG#2.
  • whether to use CBG-based transmission may be configured in units of resource pools.
  • FIG. 19 is a schematic diagram of resource pool configuration according to an embodiment of the present invention.
  • resource pool i may be affected by PSFCH.
  • UE 1 has multiplexing resources with other devices that support unicast or multicast. Therefore, resource pool i is configured to use For CBG transmission, resource pool j is not affected by PSFCH. For example, there is no device that supports unicast or multicast to multiplex with UE1, so resource pool j is configured to use TB-based transmission.
  • NR V2X in order to provide support for at least one of priority preemption, multiplexing with different TTI lengths and multiplexing with PSFCH, NR V2X needs to support CBG-based transmission to obtain the benefit of reducing retransmission overhead.
  • NR Rel-15 configures whether to use CBG-based transmission in units of carriers (or component carriers).
  • a resource pool in NR V2X may not need to support any of priority preemption, multiplexing with different TTI lengths, and multiplexing with PSFCH, so there is no need to use CBG-based transmission, so the carrier is used as the configuration
  • the smallest unit does not provide enough flexibility.
  • configuring whether to use CBG-based transmission in units of resource pools can provide greater flexibility.
  • each resource pool may be configured to use CBG-based transmission or TB-based transmission.
  • CBG-based transmission For example, define the parameter PDSCH-CodeBlockGroupTransmission.
  • the resource pool For a resource pool, if the resource pool is configured with the above parameters, the resource pool uses CBG-based transmission. If the resource pool is not configured with the above parameters, the resource pool uses TB transmission.
  • the parameter PDSCH-CodeBlockGroupTransmission can be configured when configuring the resource pool together with parameters such as the time domain and frequency domain position of the resource pool; the parameter can also be configured independently of the resource pool configuration, and by indicating which resource the parameter is related to Pool association (for example, to which resource pool is effective) establishes the association and corresponding relationship with the resource pool.
  • the above parameters may be carried by at least one of RRC signaling, system information, SCI, and DCI.
  • whether to use CBG-based transmission can also be configured for each BWP, and the principles and methods can be easily obtained from the resource pool-based configuration described above.
  • whether to use CBG-based transmission may be configured or pre-configured for a set of time-frequency resources.
  • the difference from the above configuration of whether to use CBG-based transmission in units of resource pools is that the set of time-frequency resources here is configured independently of the existing transmission/reception resource pools.
  • the same configuration method as the resource pool can be used, for example, according to the method described in section 14.1.5 of TS 36.213, and the "subframe" is replaced with "slot”.
  • the scope of action based on CBG transmission is its associated set of time-frequency resources. Since a group of time-frequency resources is configured independently of the resource pool, this group of time-frequency resources may be different from the existing resource pool or the same as the existing resource pool.
  • the CBG-based side link transmission has been schematically described above, and the CBG division will be described below.
  • the first device may divide a code block group (CBG) into the side link information according to the physical resource mapping in the first time-frequency resource.
  • the physical resource mapping in the first time-frequency resource may include: the first part and the second part in a time slot in the time domain, and/or the first sub-channel in one or more resource blocks in the frequency domain and The second subchannel.
  • the division of the first part and the second part in a time slot in the time domain may be determined by at least one of the following: the length of the physical side link feedback channel (PSFCH), the system (Numerology) corresponding Slot length, mini-slot length.
  • PSFCH physical side link feedback channel
  • Numerology system
  • mini-slot length mini-slot length
  • the boundary of the CBG may not be aligned with the boundary where the channel conditions may change. Taking the PSFCH as an example, see FIG. 18. If the CBG boundary can coincide with the boundary where the channel condition may change, the retransmission overhead can be better matched with the channel condition change, thereby further reducing the retransmission overhead and improving the retransmission efficiency.
  • FIG. 20 is another schematic diagram of a side link resource according to an embodiment of the present invention.
  • An example is given by taking the effect of PSFCH multiplexing as an example.
  • the boundary between the first and second parts coincides with the boundary between CBG#1 and CBG#2.
  • the division of CBG needs to depend on the division of the first and second parts.
  • FIG. 21 is another schematic diagram of a side link resource according to an embodiment of the present invention, and gives another example.
  • the division of CBG depends on the division of sub-channels, that is, different sub-channels can correspond to different CBGs, and the definition of sub-channels can be found in section 14.1.5 of TS 36.213.
  • V2X resources can be assigned frequency domain resources with sub-channel granularity. Different sub-channels may be affected by PSFCH to different degrees. For example, some sub-channels do not have PSFCH transmission, and some sub-channels have PSFCH transmission. To divide CBG. Similarly, the division of CBG may depend on the division of the first part and the second part as well as the division of sub-channels.
  • FIG. 22 is another schematic diagram of a side link resource according to an embodiment of the present invention.
  • the time-frequency resource mapped by the TB to which the CBG belongs is divided into four sub-blocks, which may correspond to four CBGs, respectively.
  • the time slot is affected by the PSFCH, different numerology or small time slots (that is, whether the time slot contains the first part, the second part, or more parts), and whether the frequency domain contains multiple subchannels, etc., depends on the specific physical resources
  • CBG division can be determined according to physical resource mapping.
  • the first time-frequency resource may be divided into multiple sub-blocks according to the physical resource mapping in the first time-frequency resource, and at least one of the following may be determined according to the number of the multiple sub-blocks: code The number of block groups (CBG), the size of the code block group (CBG) and the physical mapping of the code block group (CBG).
  • CBG code The number of block groups
  • CBG size of the code block group
  • CBG physical mapping of the code block group
  • the number of CBGs can be configured by the base station or the terminal device, or can be determined according to the physical resource mapping of the TB.
  • the aforementioned TB refers to one or more TBs divided into CBGs.
  • the above TB physical resource mapping refers to resource sub-block division determined by a boundary where channel conditions may change, for example, the four sub-blocks determined in FIG. 22. Determining the resource mapping of the CBG actually includes determining the correspondence between the CBG and the divided sub-blocks, for example, which CBGs are included in each sub-block.
  • the one or more code block groups (CBGs) perform physical resource mapping in the sub-block in a frequency domain first and a time domain manner, or, the one or Multiple code block groups (CBGs) perform physical resource mapping in the sub-blocks in a manner of time domain followed by frequency domain.
  • the resource of one or more CBGs is mapped to the RE in the sub-block to which the frequency domain is followed by the time domain or the time domain is followed by the frequency domain.
  • the N1 CBGs corresponding to each sub-block are mapped to REs in the order of frequency domain first, time domain first, or time domain first, then frequency domain within the time-frequency resource where this sub-block is located; similarly, For the last M2 sub-blocks, the N2 CBGs corresponding to each sub-block are mapped to REs in the order of frequency domain first, time domain first, or time domain first, then frequency domain within the time-frequency resource where this sub-block is located.
  • N M
  • N the number of CBGs
  • N CBGs can be mapped to the REs where the M sub-blocks are located according to the above CBG resource mapping method.
  • the code blocks included in the TB can be determined and the code blocks can be channel-coded. This can follow the NR Rel-15 method, for example, according to Sections 5.1 to 5.3 of TS 38.212, determine which code blocks each TB contains, and channel code these code blocks.
  • the code blocks included in each CBG may be determined. This can follow the method of NR Rel-15, for example, according to section 9.1.1 of TS 38.213, determine which code blocks each CBG contains.
  • the number of rate matching bits of each code block in the code block group can be at least according to the number of rate matching bits that the sub block to which the code block belongs can carry and the sub block can accommodate The number of code blocks is determined.
  • rate matching is performed on each code block.
  • This can be followed by the NR Rel-15 method, for example roughly in accordance with Section 5.4.2 of TS 38.212.
  • Section 5.4.2 of TS 38.212 for the code block r, the number of bits Er to be output after rate matching of the code block needs to be determined.
  • the pseudo code related to this in the NR Release-15 method is as follows:
  • NL is the number of layers or layers contained in TB
  • Qm is the modulation order
  • G represents the total number of bits available for transmission in TB
  • C' is the number of code blocks corresponding to the number of G bits.
  • G sub-block represents the total number of bits available for transmission contained in the sub-block to which the code block r belongs
  • C sub-block is the number of code blocks included in the sub-block to which the code block r belongs (number of G sub-block bits) .
  • the sub-block to which the code block r belongs can be obtained through the foregoing embodiment. For example, it can be determined to which CBG the code block r belongs, and to which sub-block the CBG belongs to can be determined, thereby determining which sub-block the code block r belongs to. After the sub-block to which the code block r belongs is determined, the number of bits G sub-block that can be accommodated in the sub-block and the number of code blocks C sub-block contained in the sub-block can be determined accordingly.
  • the bits after the rate matching of each code block can be concatenated together. This can follow the NR Rel-15 method, such as bit concatenation in accordance with TS 38.212 section 5.5.
  • information can also be sent.
  • This can follow the NR Rel-15 method.
  • PSSCH transmission you can replace the PUSCH with PSSCH according to the method described in Section 6.3.1 of TS 38.211; or you can follow the LTE V2X method, for example, for PSSCH transmission, you can follow the method described in Section 9.3 of TS 36.211.
  • the physical resource mapping needs to be carried out sub-block by sub-block according to the method. For each CBG contained in each sub-block, where the sub-block is located The time-frequency resources are mapped to REs in the order of frequency domain, then time domain, or time domain, then frequency domain.
  • the boundary of the CBG can be aligned with the resource boundary where channel changes may occur, so as to better match the CBG division with changes in channel conditions, thereby further reducing retransmission overhead and improving retransmission efficiency.
  • the first device determines the first time-frequency resource for sending the side link information; and uses the first time-frequency resource and sends the side chain to the second device based on the code block group (CBG) ⁇ Road information. Therefore, CBG-based transmission is supported in NR V2X, which not only can more flexibly support multiplexing of different services of V2X, but also can further reduce the retransmission overhead of V2X.
  • CBG code block group
  • An embodiment of the present invention provides a method for receiving side link information, which will be described from the second device side.
  • the first device communicates with the second device on the side link;
  • the second device may be a terminal device, but the present invention is not limited to this, for example, it may also be a roadside device or a network device, hereinafter the first device and the second device
  • the terminal devices are taken as examples for description.
  • FIG. 23 is a schematic diagram of a method for receiving side link information according to an embodiment of the present invention. As shown in FIG. 23, the method includes:
  • Step 2301 the second device determines a second time-frequency resource for receiving side link information
  • Step 2302 The second device uses the second time-frequency resource and receives the side link information sent by the first device based on a code block group (CBG).
  • CBG code block group
  • the second time-frequency resource is configured or pre-configured to the second device, and is configured or pre-configured to be based on a code block group (CBG).
  • CBG code block group
  • the second time-frequency resource is one or more resources in a resource pool or partial bandwidth (BWP).
  • BWP resource pool or partial bandwidth
  • one or more resource pools or partial bandwidth (BWP) of the second device is configured or pre-configured based on code block group (CBG).
  • CBG code block group
  • the resource pool or partial bandwidth is configured to be based on code block group (CBG) by at least one of: radio resource control (RRC) signaling, system information (SI), side link Control information (SCI), downlink control information (DCI).
  • RRC radio resource control
  • SI system information
  • SCI side link Control information
  • DCI downlink control information
  • the side link information includes information carried by at least one of the following channels: physical side link control channel (PSCCH), physical side link shared channel (PSSCH), physical side link feedback channel (PSFCH).
  • PSCCH physical side link control channel
  • PSSCH physical side link shared channel
  • PSFCH physical side link feedback channel
  • the second device divides the side link information into code block groups (CBG) according to the physical resource mapping in the second time-frequency resource.
  • CBG code block groups
  • the physical resource mapping in the second time-frequency resource includes: the first part and the second part in a time slot in the time domain, and/or, in one or more resource blocks in the frequency domain The first subchannel and the second subchannel.
  • the division of the first part and the second part in a time slot on the time domain is determined by at least one of the following: the length of the physical side link feedback channel (PSFCH), the time corresponding to the system (Numerology) Slot length, mini-slot length.
  • PSFCH physical side link feedback channel
  • Numerology the time corresponding to the system
  • the second time-frequency resource is divided into multiple sub-blocks according to the physical resource mapping in the second time-frequency resource, and at least one of the following is determined according to the number of the multiple sub-blocks: code block The number of groups (CBG), the size of the code block group (CBG) and the physical mapping of the code block group (CBG).
  • CBG code block The number of groups
  • CBG size of the code block group
  • CBG physical mapping of the code block group
  • the number of rate matching bits of each code block in the code block group is at least based on the number of rate matching bits that the sub block to which the code block belongs can carry and the capacity of the sub block The number of code blocks is determined.
  • the one or more code block groups perform physical resource mapping in the sub-block in a frequency domain first and a time domain manner.
  • the one or more code block groups perform physical resource mapping in the sub-block in a manner of time domain and frequency domain.
  • the second device determines the first time-frequency resource for sending the side link information; and uses the second time-frequency resource and receives the edge sent by the first device based on a code block group (CBG) Link information. Therefore, CBG-based transmission is supported in NR V2X, which not only can more flexibly support multiplexing of different services of V2X, but also can further reduce the retransmission overhead of V2X.
  • CBG code block group
  • An embodiment of the present invention provides an apparatus for sending side link information.
  • the apparatus may be, for example, a terminal device, or may be one or some components or components configured on the terminal device.
  • the present invention is not limited to this, for example, it may be a roadside device or a network device, or may be one or some components or components configured on the roadside device or the network device.
  • the content of the third embodiment is the same as that of the first embodiment.
  • FIG. 24 is a schematic diagram of an apparatus for sending side link information according to an embodiment of the present invention. As shown in FIG. 24, the apparatus 2400 for sending side link information includes:
  • a determining unit 2401 which determines a first time-frequency resource for transmitting side link information
  • a sending unit 2402 which uses the first time-frequency resource and sends the side link information to the second device based on the code block group.
  • the first time-frequency resource is configured or pre-configured to the first device, and is configured or pre-configured based on the code block group.
  • the first time-frequency resource is one or more resources in a resource pool or part of bandwidth.
  • one or more resource pools or partial bandwidths are configured or pre-configured based on code block groups.
  • the resource pool or part of the bandwidth is configured to be based on code block groups through at least one of the following signaling or information: radio resource control signaling, system information, side link control information, and downlink control information.
  • the side link information includes information carried by at least one of the following channels: a physical side link control channel, a physical side link shared channel, and a physical side link feedback channel.
  • the apparatus 2400 for sending side link information may further include:
  • a dividing unit 2403 which divides the side link information into code block groups according to the physical resource mapping in the first time-frequency resource.
  • the physical resource mapping in the first time-frequency resource includes: the first part and the second part in a time slot in the time domain, and/or, in one or more resource blocks in the frequency domain The first subchannel and the second subchannel.
  • the division of the first part and the second part within a time slot in the time domain is determined by at least one of the following lengths: length of the physical side link feedback channel, length of the time slot corresponding to the standard, hour The length of the gap.
  • the dividing unit 2403 may be further used to divide the first time-frequency resource into multiple sub-blocks according to the physical resource mapping in the first time-frequency resource, and according to the multiple sub-blocks
  • the number of is determined by at least one of the following: the number of code block groups, the size of the code block group, and the physical mapping of the code block group.
  • the number of rate matching bits of each code block in the code block group is at least according to the number of rate matching bits that the sub block to which the code block belongs can carry and the number of code blocks that the sub block can accommodate determine.
  • the code block group performs physical resource mapping in the sub-block in a frequency domain first time domain manner, or the code block group is in the sub block Physical resource mapping is performed in the manner of time domain and then frequency domain.
  • the device 2400 for transmitting side link information may further include other components or modules.
  • the device 2400 for transmitting side link information may further include other components or modules.
  • FIG. 24 only exemplarily shows the connection relationship or signal direction between the various components or modules, but those skilled in the art should understand that various related technologies such as bus connection can be used.
  • the above-mentioned various components or modules may be implemented by hardware facilities such as processors, memories, transmitters, receivers, etc.; the implementation of the present invention does not limit this.
  • the first device determines the first time-frequency resource for sending the side link information; and uses the first time-frequency resource and sends the side chain to the second device based on the code block group (CBG) ⁇ Road information. Therefore, CBG-based transmission is supported in NR V2X, which not only can more flexibly support the multiplexing of different services of V2X, but also can further reduce the retransmission overhead of V2X.
  • CBG code block group
  • An embodiment of the present invention provides an apparatus for receiving side link information.
  • the apparatus may be, for example, a terminal device or a network device, or may be one or some components or components configured on the terminal device or the network device.
  • the present invention is not limited to this, for example, it may be a roadside device, or may be one or some components or components disposed on the roadside device.
  • the same content of this embodiment 4 as that of embodiment 2 is not repeated here.
  • FIG. 25 is a schematic diagram of an apparatus for receiving side link information according to an embodiment of the present invention. As shown in FIG. 25, the apparatus 2500 for receiving side link information includes:
  • a determining unit 2501 which determines a second time-frequency resource for receiving side link information
  • the receiving unit 2502 uses the second time-frequency resource and receives the side link information sent by the first device based on the code block group.
  • the second time-frequency resource is configured or pre-configured to the second device, and is configured or pre-configured based on the code block group.
  • the second time-frequency resource is one or more resources in a resource pool or part of the bandwidth.
  • one or more resource pools or part of the bandwidth of the second device is configured or pre-configured based on code block groups.
  • the device 2500 for receiving side link information may further include:
  • the dividing unit 2503 divides the side link information into code block groups according to the physical resource mapping in the second time-frequency resource.
  • the physical resource mapping in the second time-frequency resource includes: the first part and the second part in a time slot in the time domain, and/or, in one or more resource blocks in the frequency domain The first subchannel and the second subchannel.
  • the dividing unit 2503 may be further configured to divide the second time-frequency resource into multiple sub-blocks according to the physical resource mapping in the second time-frequency resource, and according to the multiple sub-blocks
  • the number of is determined by at least one of the following: the number of code block groups, the size of the code block group, and the physical mapping of the code block group.
  • the device 2500 for receiving side link information may further include other components or modules.
  • the device 2500 for receiving side link information may further include other components or modules.
  • FIG. 25 only exemplarily shows the connection relationship or signal direction between the various components or modules, but it should be clear to those skilled in the art that various related technologies such as bus connection may be used.
  • the above-mentioned various components or modules may be implemented by hardware facilities such as processors, memories, transmitters, receivers, etc.; the implementation of the present invention does not limit this.
  • the second device determines the first time-frequency resource for sending the side link information; and uses the second time-frequency resource and receives the edge sent by the first device based on a code block group (CBG) Link information. Therefore, CBG-based transmission is supported in NR V2X, which not only can more flexibly support multiplexing of different services of V2X, but also can further reduce the retransmission overhead of V2X.
  • CBG code block group
  • an embodiment of the present invention also provides a communication system.
  • the communication system 100 may include:
  • the first device 102 which determines a first time-frequency resource for transmitting side link information, uses the first time-frequency resource and transmits the side link information based on a code block group;
  • the second device 103 determines the second time-frequency resource for receiving the side link information, uses the second time-frequency resource and receives the side link information based on the code block group.
  • the communication system 100 may further include:
  • the network device 101 which provides services for the first device 102 and/or the second device 103.
  • An embodiment of the present invention further provides a network device, which may be, for example, a base station, but the present invention is not limited to this, and may also be other network devices.
  • a network device which may be, for example, a base station, but the present invention is not limited to this, and may also be other network devices.
  • FIG. 26 is a schematic diagram of a network device according to an embodiment of the present invention.
  • the network device 2600 may include: a processor 2610 (eg, a central processing unit CPU) and a memory 2620; the memory 2620 is coupled to the processor 2610.
  • the memory 2620 can store various data; in addition, an information processing program 2630 is stored, and the program 2630 is executed under the control of the processor 2610.
  • the network device 2600 may further include: a transceiver 2640, an antenna 2650, and the like; wherein, the functions of the above components are similar to those in the prior art, and are not repeated here. It is worth noting that the network device 2600 does not necessarily include all the components shown in FIG. 26; in addition, the network device 2600 may also include components not shown in FIG. 26, and reference may be made to the prior art.
  • An embodiment of the present invention further provides a terminal device, but the present invention is not limited to this, and may also be other devices.
  • FIG. 27 is a schematic diagram of a terminal device according to an embodiment of the present invention.
  • the terminal device 2700 may include a processor 2710 and a memory 2720; the memory 2720 stores data and programs, and is coupled to the processor 2710. It is worth noting that the figure is exemplary; other types of structures can also be used to supplement or replace the structure to achieve telecommunications functions or other functions.
  • the processor 2710 may be configured to execute a program to implement the method for transmitting side link information as described in Embodiment 1.
  • the processor 2710 may be configured to perform the following control: determine a first time-frequency resource for transmitting side link information; and use the first time-frequency resource and send to a second device based on a code block group (CBG) The side link information.
  • CBG code block group
  • the processor 2710 may be configured to execute a program to implement the side link information receiving method as described in Embodiment 2.
  • the processor 2710 may be configured to perform the following control: determine a second time-frequency resource for receiving side link information; and use the second time-frequency resource and receive a first device transmission based on a code block group (CBG) Of the side link information.
  • CBG code block group
  • the terminal device 2700 may further include: a communication module 2730, an input unit 2740, a display 2750, and a power supply 2760. Among them, the functions of the above components are similar to those in the prior art, and will not be repeated here. It is worth noting that the terminal device 2700 does not necessarily include all the components shown in FIG. 27, and the above-mentioned components are not necessary; in addition, the terminal device 2700 may also include components not shown in FIG. 27. Have technology.
  • An embodiment of the present invention also provides a computer program, wherein when the program is executed in a terminal device, the program causes the terminal device to execute the method for transmitting side link information described in Embodiment 1 or the method described in Embodiment 2. The method of receiving the side link information described above.
  • An embodiment of the present invention also provides a storage medium storing a computer program, wherein the computer program causes the terminal device to execute the method for transmitting side link information described in Embodiment 1 or the method of transmitting side link information described in Embodiment 2. Reception method.
  • An embodiment of the present invention also provides a computer program, wherein when the program is executed in a network device, the program causes the network device to execute the method for transmitting side link information described in Embodiment 1 or the method described in Embodiment 2. The method of receiving the side link information described above.
  • An embodiment of the present invention also provides a storage medium storing a computer program, wherein the computer program causes a network device to execute the method for transmitting side link information described in Embodiment 1 or the method of transmitting side link information described in Embodiment 2. Reception method.
  • the above device and method of the present invention may be implemented by hardware, or may be implemented by hardware in combination with software.
  • the present invention relates to such a computer-readable program which, when executed by a logic component, can enable the logic component to implement the above-described device or constituent component, or enable the logic component to implement the various methods described above Or steps.
  • the invention also relates to storage media for storing the above programs, such as hard disks, magnetic disks, optical disks, DVDs, flash memories, and so on.
  • the method/apparatus described in conjunction with the embodiments of the present invention may be directly embodied as hardware, a software module executed by a processor, or a combination of both.
  • one or more of the functional block diagrams and/or one or more combinations of the functional block diagrams shown in the figures may correspond to each software module of the computer program flow or each hardware module.
  • These software modules can respectively correspond to the steps shown in the figure.
  • These hardware modules can be realized by solidifying these software modules using, for example, a field programmable gate array (FPGA).
  • FPGA field programmable gate array
  • the software module may be located in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.
  • a storage medium may be coupled to the processor, so that the processor can read information from the storage medium and write information to the storage medium; or the storage medium may be an integral part of the processor.
  • the processor and the storage medium may be located in the ASIC.
  • the software module can be stored in the memory of the mobile terminal or in a memory card that can be inserted into the mobile terminal.
  • the software module may be stored in the MEGA-SIM card or a large-capacity flash memory device.
  • the functional blocks described in the drawings and/or one or more combinations of the functional blocks it can be implemented as a general-purpose processor, a digital signal processor (DSP) for performing the functions described in the present invention ), application specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any suitable combination thereof.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • One or more of the functional blocks described in the drawings and/or one or more combinations of the functional blocks can also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, multiple microprocessing Processor, one or more microprocessors in communication with the DSP, or any other such configuration.
  • Appendix 1 A method for sending side link information, including:
  • the first device determines the first time-frequency resource for transmitting side link information
  • the first device uses the first time-frequency resource and sends the side link information to the second device based on a code block group (CBG).
  • CBG code block group
  • Appendix 2 The method according to Appendix 1, wherein the first time-frequency resource is configured or pre-configured to the first device, and is configured or pre-configured to be based on a code block group (CBG).
  • CBG code block group
  • Appendix 3 The method according to Appendix 1 or 2, wherein the first time-frequency resource is one or more resources in a resource pool or a partial bandwidth (BWP).
  • Appendix 4 The method according to any one of Appendixes 1 to 3, wherein one or more resource pools or partial bandwidth (BWP) of the first device is configured or pre-configured to be based on code block group (CBG ).
  • BWP resource pools or partial bandwidth
  • Appendix 5 The method according to Appendix 3 or 4, wherein the resource pool or partial bandwidth (BWP) is configured to be based on code block group (CBG) by at least one of the following: radio resource control (RRC) information Order, system information (SI), side link control information (SCI), downlink control information (DCI).
  • RRC radio resource control
  • SI system information
  • SCI side link control information
  • DCI downlink control information
  • Appendix 6 The method according to any one of Appendixes 1 to 5, wherein the side link information includes information carried by at least one of the following channels: physical side link control channel (PSCCH), physical side Link shared channel (PSSCH), physical side link feedback channel (PSFCH).
  • PSCCH physical side link control channel
  • PSSCH physical side Link shared channel
  • PSFCH physical side link feedback channel
  • Appendix 7 The method according to any one of Appendixes 1 to 6, wherein the method further comprises:
  • the first device divides the side link information into code block groups (CBG) according to the physical resource mapping in the first time-frequency resource.
  • CBG code block groups
  • Appendix 8 The method according to Appendix 7, wherein the physical resource mapping in the first time-frequency resource includes: the first part and the second part in a time slot on the time domain, and/or, the frequency domain The first sub-channel and the second sub-channel within one or more resource blocks.
  • the division of the first part and the second part in a time slot in the time domain is determined by at least one of the following: the length of the physical side link feedback channel (PSFCH), The length of the slot corresponding to the standard (Numerology) and the length of the mini-slot.
  • PSFCH physical side link feedback channel
  • Appendix 10 The method according to any one of Appendixes 7 to 9, wherein the first time-frequency resource is divided into a plurality of sub-blocks according to the physical resource mapping in the first time-frequency resource, and The number of the plurality of sub-blocks is determined as at least one of the following: the number of code block groups (CBG), the size of the code block group (CBG), and the physical mapping of the code block group (CBG).
  • CBG code block groups
  • CBG size of the code block group
  • CBG physical mapping of the code block group
  • Appendix 11 The method according to Appendix 10, wherein the number of rate matching bits of each code block in the code block group (CBG) is at least according to the rate matching bits that the sub-block to which the code block belongs can carry The number and the number of code blocks that the sub-block can accommodate are determined.
  • Appendix 12 The method according to Appendix 10 or 11, wherein, for a certain sub-block, one or more of the code block groups (CBGs) in the sub-block follow the frequency domain and then the time domain Perform physical resource mapping.
  • CBGs code block groups
  • Appendix 13 The method according to Appendix 10 or 11, wherein, for a certain sub-block, one or more of the code block groups (CBG) in the sub-block follow the time domain and then the frequency domain Perform physical resource mapping.
  • CBG code block groups
  • Appendix 14 A method for receiving side link information, including:
  • the second device determines a second time-frequency resource for receiving side link information
  • the second device uses the second time-frequency resource and receives the side link information sent by the first device based on a code block group (CBG).
  • CBG code block group
  • Appendix 15 The method according to Appendix 14, wherein the second time-frequency resource is configured or pre-configured to the second device, and is configured or pre-configured to be based on a code block group (CBG).
  • CBG code block group
  • Appendix 16 The method according to Appendix 14 or 15, wherein the second time-frequency resource is one or more resources in a resource pool or a partial bandwidth (BWP).
  • Appendix 17 The method according to any one of Appendixes 14 to 16, wherein one or more resource pools or partial bandwidth (BWP) of the second device is configured or pre-configured based on code block group (CBG ).
  • BWP resource pools or partial bandwidth
  • Appendix 18 The method according to Appendix 16 or 17, wherein the resource pool or partial bandwidth (BWP) is configured to be based on code block group (CBG) by at least one of the following: radio resource control (RRC) information Order, system information (SI), side link control information (SCI), downlink control information (DCI).
  • RRC radio resource control
  • SI system information
  • SCI side link control information
  • DCI downlink control information
  • Appendix 19 The method according to any one of Appendixes 14 to 18, wherein the side link information includes information carried by at least one of the following channels: physical side link control channel (PSCCH), physical side Link shared channel (PSSCH), physical side link feedback channel (PSFCH).
  • PSCCH physical side link control channel
  • PSSCH physical side Link shared channel
  • PSFCH physical side link feedback channel
  • Appendix 20 The method according to any one of Appendixes 14 to 19, wherein the method further comprises:
  • the second device divides the side link information into code block groups (CBG) according to the physical resource mapping in the second time-frequency resource.
  • CBG code block groups
  • Appendix 21 The method according to Appendix 20, wherein the physical resource mapping in the second time-frequency resource includes: the first part and the second part in a time slot in the time domain, and/or, the frequency domain The first sub-channel and the second sub-channel within one or more resource blocks.
  • the division of the first part and the second part in a time slot in the time domain is determined by at least one of the following: the length of the physical side link feedback channel (PSFCH), The length of the slot corresponding to the standard (Numerology) and the length of the mini-slot.
  • PSFCH physical side link feedback channel
  • Appendix 23 The method according to any one of Appendixes 20 to 22, wherein the second time-frequency resource is divided into multiple sub-blocks according to the physical resource mapping in the second time-frequency resource, and The number of the plurality of sub-blocks is determined as at least one of the following: the number of code block groups (CBG), the size of the code block group (CBG), and the physical mapping of the code block group (CBG).
  • CBG code block groups
  • CBG size of the code block group
  • CBG physical mapping of the code block group
  • Appendix 24 The method according to Appendix 23, wherein the number of rate matching bits of each code block in the code block group (CBG) is at least according to the rate matching bits that the subblock to which the code block belongs can carry The number and the number of code blocks that the sub-block can accommodate are determined.
  • CBG code block group
  • Supplementary note 25 The method according to supplementary note 23 or 24, wherein, for a certain sub-block, one or more of the code block groups (CBG) in the sub-block follow the frequency domain and then the time domain Perform physical resource mapping.
  • CBG code block groups
  • Appendix 26 The method according to Appendix 23 or 24, wherein, for a certain sub-block, one or more of the code block groups (CBGs) in the sub-block follow the time domain and then the frequency domain Perform physical resource mapping.
  • CBGs code block groups
  • Appendix 27 A terminal device, including a memory and a processor, the memory stores a computer program, the processor is configured to execute the computer program to implement the edge according to any one of Appendix 1 to 13.
  • Appendix 28 A network device, including a memory and a processor, the memory stores a computer program, the processor is configured to execute the computer program to implement the edge according to any one of Appendix 1 to 13.

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

Abstract

L'invention concerne un procédé et un dispositif permettant d'envoyer et de recevoir des informations de liaison descendante. Le procédé comprend les étapes suivantes : un premier dispositif détermine une première ressource temps-fréquence utilisée pour envoyer des informations de liaison latérale ; et la première ressource temps-fréquence est utilisée pour envoyer les informations de liaison latérale à un second dispositif sur la base de groupes de blocs de code (CBG). Par conséquent, la transmission basée sur des CBG est prise en charge dans NR V2X, non seulement en prenant en charge de manière flexible la réutilisation de différents services V2X, mais aussi en réduisant davantage le coût de retransmission V2X.
PCT/CN2019/071183 2019-01-10 2019-01-10 Procédé et dispositif pour envoyer et recevoir des informations de liaison latérale WO2020142987A1 (fr)

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WO2022251785A1 (fr) * 2021-05-26 2022-12-01 Qualcomm Incorporated Procédés et appareils pour générer un groupe de blocs de code dynamique dans une liaison latérale
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