WO2020095403A1 - Dispositif terminal, système de communication et procédé de communication - Google Patents

Dispositif terminal, système de communication et procédé de communication Download PDF

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Publication number
WO2020095403A1
WO2020095403A1 PCT/JP2018/041456 JP2018041456W WO2020095403A1 WO 2020095403 A1 WO2020095403 A1 WO 2020095403A1 JP 2018041456 W JP2018041456 W JP 2018041456W WO 2020095403 A1 WO2020095403 A1 WO 2020095403A1
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Prior art keywords
resources
axis direction
resource
terminal
frequency axis
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PCT/JP2018/041456
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English (en)
Japanese (ja)
Inventor
ウージヤンミン
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富士通株式会社
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Priority to PCT/JP2018/041456 priority Critical patent/WO2020095403A1/fr
Publication of WO2020095403A1 publication Critical patent/WO2020095403A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/46—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for vehicle-to-vehicle communication [V2V]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the present invention relates to a terminal device, a communication system, and a communication method.
  • the traffic of mobile terminals (smartphones and future phones) occupy most of the network resources. Also, the traffic used by mobile terminals tends to continue to grow.
  • eMBB Enhanced Mobile BroadBand
  • Massive MTC Machine Type Communications
  • URLLC Ultra-Reliable and Low Latency Communication
  • V2X Vehicle to Everything
  • V2X is, for example, a road infrastructure such as V2V (Vehicle to Vehicle) that performs inter-vehicle communication, V2P (Vehicle to Pedestrian) that communicates between a car and a pedestrian (Pedestrian), and a road infrastructure such as a car and a sign using a side link channel.
  • V2I Vehicle to Infrastructure
  • V2N Vehicle to Network
  • PSCCH Physical Sidelink Control CHannel
  • PSSCH Physical Sidelink Shared CHannel
  • SCI Servicelink Control Information
  • V2X as a method of allocating resources, for example, there are a method in which a mobile communication system centrally controls and a method in which each terminal device implementing V2X autonomously controls.
  • the method in which the mobile communication system centrally controls is applicable when a terminal device that implements V2X is present in the coverage of the mobile communication system.
  • LTE-V2X it is also called mode 3
  • NR- In V2X it is also called mode 1.
  • the method in which each terminal device autonomously controls is applicable even if the terminal device is not within the coverage of the mobile communication system.
  • mode 4 in LTE-V2X
  • mode 2 in NR-V2X.
  • mode 3 and mode 4 will be used.
  • mode 4 since communication between the terminal device and the mobile communication system for resource allocation is not performed, the transmission delay when transmission data occurs in the terminal device is shortened and the strict delay requirement is satisfied. Is possible.
  • each terminal device senses the frequency band used for V2X, excludes resources that are likely to be used by other terminal devices based on the sensing result, and selects resources used for data transmission. To do.
  • FIG. 19 is a diagram showing an example of resource selection in mode 4.
  • the terminal device sets a selection window (Selected Window) of a time width corresponding to the delay time (Latency Deadline) allowed for the transmission data. Then, the terminal device excludes resources that are likely to be used by another terminal device within the selection window, based on the result of sensing up to time T. In FIG. 19, for example, resources indicated by diagonal lines and horizontal lines are excluded. Then, the terminal device selects any of the resources that remain without being excluded in the selection window, maps the transmission data to the selected resource, and transmits the transmission data.
  • 3GPP TS 22.186 V16.0.0 (2018-09) 3GPP TS 36.211 V15.2.0 (2018-06) 3GPP TS 36.212 V15.2.1 (2018-07) 3GPP TS 36.213 V15.2.0 (2018-06) 3GPP TS 36.300 V15.2.0 (2018-06) 3GPP TS 36.321 V15.2.0 (2018-07) 3GPP TS 36.322 V15.1.0 (2018-07) 3GPP TS 36.323 V15.0.0 (2018-07) 3GPP TS 36.331 V15.2.2 (2018-06) 3GPP TS 36.413 V15.2.0 (2018-06) 3GPP TS 36.423 V15.2.0 (2018-06) 3GPP TS 36.425 V15.0.0 (2018-06) 3GPP TS 37.340 V15.2.0 (2018-06) 3GPP TS 38.201 V15.0.0 (2017-12) 3GPP TS 38.202 V15.2.0 (2018-06)
  • the above-mentioned non-patent document 40 defines the PRR (Packet reception ratio).
  • the PRR is, for example, the number of terminal devices (or vehicles) located within the range (a, b) from the transmission packet for the transmission packet, and the number of terminal devices (or vehicles) that have succeeded in reception within Y When the number is X, it is represented by X / Y.
  • the PRR represents, for example, the number of terminal devices that have been successfully received among the receiving terminal devices.
  • FIG. 20 is a diagram showing an example in which vehicles h1 to h8 equipped with terminal devices communicate with each other.
  • the vehicle h2 transmits packet data (hereinafter sometimes referred to as “packet”) # 1 to the other vehicles h1 and h3 to h8, and the vehicle h4 also has the other vehicles h1 to h3.
  • Packet # 2 is transmitted to h5 to h8.
  • the size (or data amount) of packet # 1 transmitted from vehicle h2 and the size of packet # 2 transmitted from vehicle h4 may differ.
  • the sizes of the packets may be different.
  • the disclosed technique is made in view of the above, and an object thereof is to provide a terminal device, a communication system, and a communication method capable of dynamically changing the size of packet data and transmitting the packet data. ..
  • the disclosed technology has been made in view of the above, and an object thereof is to provide a terminal device, a communication system, and a communication method capable of controlling the number of retransmissions.
  • N is an integer of 1 or more in the frequency axis direction
  • N T N T is an integer of 2 or more in the time axis direction
  • the first N resources in the frequency axis direction are allocated to the respective terminal devices as the first resources
  • the second to N T th resources in the time axis direction which are the first in the frequency axis direction are allocated to the first resource.
  • the second resource to the Nth resource in the frequency axis direction which is the second resource in the time axis direction, are allocated to the other terminal devices as the first resource.
  • the second to third N T th resources in the time axis direction are assigned to the respective other terminal devices as the second resources, and are assigned to the remaining resources of the N ⁇ N T resources.
  • a subgroup management unit that copies at least one of the N T resources in the axial direction, a control signal or data is transmitted using the first resource, and the second resource is used to transmit the control signal or data.
  • a transmission control unit that retransmits a control signal or the data.
  • FIG. 1 is a diagram showing a configuration example of a communication system.
  • FIG. 2 is a diagram showing a configuration example of the terminal device.
  • FIG. 3 is a diagram illustrating an example of resource allocation.
  • FIG. 4 is a diagram illustrating a configuration example of subchannels.
  • FIG. 5 is a diagram showing an example of resource allocation.
  • 6A is an initial resource pattern
  • FIGS. 6B and 6C are diagrams showing examples of resource allocation after copying in the frequency axis direction.
  • FIG. 7A and FIG. 7B are diagrams showing examples of transmission type information.
  • FIG. 8A is a diagram showing an initial resource pattern
  • FIGS. 8B and 8C are diagrams showing examples of resource allocation after copying in the time axis direction.
  • FIG. 9A is a diagram showing an initial resource pattern
  • FIG. 9B is a diagram showing an example of resource allocation after copying in the frequency axis direction
  • FIG. 10 is a diagram showing an example of resource allocation after copying in the time axis direction
  • FIG. 11A is a diagram showing an initial resource pattern
  • FIG. 11B is a diagram showing an example of resource allocation after copying in the time axis direction
  • FIG. 12 is a diagram showing an example of resource allocation after copying in the frequency axis direction
  • FIG. 13 is a diagram illustrating an example of resource allocation in the V2X group.
  • 14A and 14B are diagrams showing an example of randomization.
  • FIG. 15 is a flowchart showing an example of resource allocation.
  • FIG. 15 is a flowchart showing an example of resource allocation.
  • FIG. 16 is a flowchart showing an example of resource allocation processing.
  • FIG. 17 is a flowchart showing an example of resource allocation processing.
  • FIG. 18 is a diagram illustrating a configuration example of a base station device.
  • FIG. 19 is a diagram showing an example of resource selection in mode 4.
  • FIG. 20 is a diagram illustrating an example in which communication is performed between vehicles.
  • FIG. 1 is a diagram illustrating a configuration example of a communication system 10 according to the first embodiment.
  • the communication system 10 includes a plurality of terminal devices 100-1 to 100-3.
  • the terminal devices 100-1 to 100-3 are provided in the vehicles 100-v1 to 100-v3, respectively.
  • the terminal devices 100-1 to 100-3 are capable of wireless communication such as feature phones, smartphones, personal computers, tablet terminals, and game devices. It is a communication device.
  • the terminals 100-1 to 100-3 can communicate with each other, for example.
  • the terminals 100-1 to 100-3 can send and receive data to and from each other without performing wireless communication with the base station device (hereinafter, also referred to as “base station”) 200.
  • the terminals 100-1 to 100-3 can autonomously control wireless communication even if they are not within the coverage of the communication system 10.
  • An example of such terminal-to-terminal communication is V2X communication.
  • V2X is a general term for V2V, V2P, V2I, V2N, etc., as described above, for example. Therefore, for example, in FIG.
  • the terminal 100-1 when the terminal 100-1 is included in the vehicle 100-v1, the terminal 100-2, which is one of the communication partners, may be held by a pedestrian instead of the vehicle 100-v2. However, it may be provided in the sign. However, in the following description, the terminals 100-1 to 100-3 will be described as being provided in the vehicles 100-v1 to 100-v3.
  • each of the terminals 100-1 to 100-3 can communicate with other terminals within the coverage range (In-coverage) of the base station 200 and is outside the coverage range of the base station 200. (Out-of-coverage) enables communication with other terminals.
  • the terminal 100-1 when the terminal 100-1 is located within the coverage range of the base station 200, the terminal 100-1 receives the RRC (Radio Resource Control) message or L1 (Layer 1) transmitted from the base station 200. ) Control signal (hereinafter, may be simply referred to as “control signal”).
  • the terminal 100-1 can use the information included in the RRC message or the control signal to perform inter-terminal communication with other terminals.
  • the terminals 100-1 to 100-3 cannot receive the data transmitted from the other terminals when transmitting the data and the like, and do not receive the data when receiving the data from the other terminals. Cannot be sent to other terminals. That is, the terminals 100-1 to 100-3 are terminals that cannot be set to the reception mode in the transmission mode and cannot be set to the transmission mode in the reception mode. Such terminals 100-1 to 100-3 may be referred to as Half-duplex (mode) terminals, for example.
  • mode Half-duplex
  • the communication system 10 may include the base station 200.
  • a control channel or data channel defined by NR may be used.
  • the PSCCH defined by V2X communication as the control channel and the PSSCH defined by V2X communication as the data channel will be described as examples.
  • FIG. 1 shows an example in which the communication system 10 includes three terminals 100-1 to 100-3.
  • the number of terminals 100-1 to 100-3 included in the communication system 10 may be two, or four or more.
  • terminals 100-1 to 100-3 may be referred to as the terminal 100 unless otherwise specified.
  • FIG. 2 is a diagram illustrating a configuration example of the terminal 100.
  • the terminal 100 includes a processor 110, a memory 120, a wireless communication unit 130, and an antenna 140.
  • the processor 110 is, for example, a CPU (Central Processing Unit), a DSP (Digital Signal Processor), or an FPGA (Field Programmable Gate Array), and controls the entire terminal 100.
  • the processor 110 includes a group management unit 111, a used resource control unit 112, a transmission control unit 113, and a reception control unit 114.
  • the group management unit 111 manages the group to which the terminal 100 belongs. Specifically, the group management unit 111 controls, for example, the joining and leaving of the terminal 100 to and from the group, and manages the identification information and the used resources of the terminals 100 belonging to the same group.
  • the group managed by the group management unit 111 may be referred to as a V2X group, for example.
  • the group management unit 111 includes a subgroup management unit 1110.
  • the subgroup management unit 1110 manages the subgroup to which the terminal 100 belongs. Specifically, the subgroup management unit 1110 controls, for example, the terminal 100 to join or leave the subgroup, and manages the identification information and the used resources of the terminals 100 belonging to the same subgroup.
  • the subgroup managed by the subgroup management unit 1110 is, for example, a subgroup included in the V2X group. That is, the subgroup management unit 1110 determines the number of subgroups included in the V2X group based on, for example, the number of terminals, the number of subchannels (or resources) included in the frequency axis direction, and includes its own station.
  • the terminal 100 is sequentially allocated to each subgroup. Then, the subgroup management unit 1110 manages the resources of the terminals 100 included in the subgroup, and allocates the resources of the control channel (PSCCH) and the data channel (PSSCH) to the terminals 100 included in the subgroup.
  • PSCCH control channel
  • PSSCH data channel
  • the subgroup management unit 1110 allocates each resource to each terminal 100 included in the subgroup by using the identification information of each terminal 100.
  • the resource to which each terminal 100 is mapped is indicated by, for example, the SCI included in the control signal.
  • the subgroup management unit 1110 generates an SCI including such information, generates a control signal including the SCI, and outputs the generated control signal to the used resource control unit 112.
  • the subgroup management unit 1110 can increase resources by, for example, copying the resources allocated to each terminal in at least one of the frequency axis direction and the time axis direction. It is possible. Thereby, for example, the terminal 100 can dynamically (or dynamically) change the size of packet data for transmission, and can control the number of retransmissions. Details will be described later.
  • the used resource control unit 112 controls resources used by the terminal 100 for transmitting control signals and data. Specifically, the used resource control unit 112 controls the resource of the control channel and the resource of the data channel according to the allocation result included in the control signal output from the subgroup management unit 1110. For example, the used resource control unit 112 receives the allocation result shown in FIG. 10, and controls the transmission of the control signal using a predetermined resource (v1, v2, etc.) and the data transmission according to the allocation result.
  • v1, v2, etc. a predetermined resource
  • the transmission control unit 113 controls the wireless communication unit 130 to transmit control signals and data using the resource controlled by the used resource control unit 112. Specifically, the transmission control unit 113 performs the following processing. That is, the transmission control unit 113 receives data from the application processing unit or the like in the processor 110, and modulates the received data with error correction coding processing (hereinafter, may be referred to as “coding processing”). Perform processing, etc. Further, the transmission control unit 113 performs coding processing, modulation processing, and the like on the control signal received from the subgroup management unit 1110 via the used resource control unit 112.
  • coding processing error correction coding processing
  • the transmission control unit 113 maps the control signal to each resource of the PSCCH and the data to each resource of the PSSCH according to the instruction from the used resource control unit 112. Then, the transmission control unit 113 transmits the transmission signal obtained by mapping by multicast (or group cast) via the wireless communication unit 130.
  • the reception control unit 114 performs demodulation processing, error correction decoding processing (hereinafter sometimes referred to as “decoding processing”), and the like on a received signal received from another terminal 100. Specifically, the reception control unit 114 extracts (or reproduces) a control signal by performing demodulation processing and decoding processing on the reception signal mapped on the PSCCH. Further, the reception control unit 114 extracts (or reproduces) data by performing demodulation processing and decoding processing on the reception signal mapped on the PSSCH. The reception control unit 114 outputs the extracted control signal and data to the subgroup management unit 1110, the application processing unit in the processor 110, or the like.
  • decoding processing error correction decoding processing
  • the memory 120 is, for example, a ROM (Read Only Memory) or a RAM (Random Access Memory).
  • the memory 120 stores, for example, a program, the processor 110 reads the program, and the processor 110 executes the program. By this execution, for example, in the terminal 100, each function of the group management unit 111, the subgroup management unit 1110, the used resource control unit 112, the transmission control unit 113, and the reception control unit 114 can be realized.
  • the memory 120 also stores, for example, information used when the processor 110 executes a process.
  • the wireless communication unit 130 performs D / A (Digital to Analog) conversion processing and frequency conversion processing (up conversion) to a wireless band on the transmission signal output from the transmission control unit 113.
  • the wireless communication unit 130 outputs the wireless signal converted into the wireless band to the antenna 140.
  • the wireless communication unit 130 performs frequency conversion processing (down conversion) to a baseband band, A / D (Analog to Digital) conversion processing, and the like on the wireless signal output from the antenna 140, and receives the received signal. Convert to.
  • the wireless communication unit 130 outputs the reception signal to the reception control unit 114.
  • the antenna 140 transmits the wireless signal output from the wireless communication unit 130 to another terminal 100.
  • the antenna 140 receives a radio signal transmitted from another terminal 100 and outputs the received radio signal to the reception control unit 114.
  • FIG. 3 is a diagram illustrating an example of resource allocation for one subgroup.
  • the horizontal axis represents the time axis direction and the vertical axis represents the frequency axis direction.
  • N T is an integer of 2 or more resources corresponding to the number of sub-channels in the frequency axis direction. Therefore, the number of resources shown in FIG. 3 is N ⁇ N T.
  • identification information from v1 to v (N ⁇ (N + 1) / 2) (N represents the number of subchannels in the frequency axis direction, for example, and represents an integer of 1 or more). Allocated.
  • Each piece of identification information represents, for example, identification information of each terminal 100.
  • v1 represents a resource allocated to the terminal 100-1
  • v2 represents a resource allocated to the terminal 100-2.
  • the terminal 100 to which the identification information v1 is added may be referred to as a terminal v1 and the terminal 100 to which the identification information v2 is added may be referred to as a terminal v2. Therefore, the terminal 100 to which the identification information v (N ⁇ (N + 1) / 2) is added may be referred to as a terminal v (N ⁇ (N + 1) / 2).
  • the terminal 100 allocates each of the N resources of the first in the time axis direction and the first to Nth resources in the frequency axis direction to the respective terminals 100 of the terminals v1 to vN. .. Further, the terminal 100 allocates N resources, which are the first in the frequency axis direction and the second to (N + 1) th resources in the time axis direction, to each of the terminals v1 to vN.
  • the terminal 100 allocates (N-1) resources from the second to the Nth in the frequency axis direction, which are second in the time axis direction, to the terminals v (N + 1) to v (2N-1). It is assigned to each terminal 100. Further, the terminal 100 allocates (N-1) resources, which are the second in the frequency axis direction and the third to (N + 1) th resources in the time axis direction, to terminals v (N + 1) to v (2N-1). Assign to.
  • the terminal 100 repeats these for the remaining resources. Finally, the terminal 100 allocates the Nth resource in the time axis direction, the Nth resource in the frequency axis direction, the (N + 1) th resource in the time axis direction, and the Nth resource in the frequency axis direction to the terminal v (N ⁇ (N + 1 ) / 2).
  • two resources are allocated to each of the terminals v1 to v (N ⁇ (N + 1) / 2).
  • two resources are assigned to the terminal v1.
  • the first resource in the time axis direction and the first to Nth resources in the frequency axis direction represent resources for initial transmission of at least one of the control signal and the data.
  • the first resource in the frequency axis direction and the second to (N + 1) th resources in the time axis direction represent resources for retransmission of at least one of the control signal and the data.
  • the second resource in the time axis direction and the second to Nth resources in the frequency axis direction represent resources for initial transmission of at least one of the control signal and the data.
  • the second resource in the frequency axis direction and the third to (N + 1) th resources in the time axis direction represent resources for retransmission of at least one of the control signal and the data.
  • the terminal v1 transmits at least one of the control signal and the data using the first resource in the frequency axis direction and the first resource in the time axis direction, and transmits the first signal in the frequency axis direction and the second in the time axis direction. It is possible to retransmit at least one of the control signal and the data by using the resource.
  • Each terminal 100 in the first embodiment is a Half-Duplex, and cannot perform transmission and reception at the same time.
  • the arrangement of resources shown in FIG. 3 makes it possible for all users to ensure that they receive a transmitted packet at least once. Further, since there are two opportunities to transmit the control signal or data, the terminal 100 on the receiving side receives the data transmitted from the terminal on the transmitting side, as compared with the case where the transmission opportunity is once. It is possible to improve the probability.
  • FIG. 4 is a diagram illustrating a configuration example of resources for one subchannel.
  • the vertical axis represents the frequency axis direction and the horizontal axis represents the time axis direction.
  • the resource shown in FIG. 4 represents, for example, a configuration example of each resource shown in FIG.
  • the resource for one sub-channel includes one or a plurality of channel elements (CE: Channel Element; hereinafter, sometimes referred to as “CE”).
  • CE Channel Element
  • FIG. 4 represents an example in which M F CEs are included in the frequency axis direction and M T CEs are included in the time axis direction.
  • CE is, for example, a minimum transmission unit that can convey a control signal or a data signal (or data).
  • CE represents the minimum unit of scheduling resources that can transmit and receive control signals and data signals, for example.
  • One CE may be, for example, a resource element (RE: Resource Element) in LTE (Long Term Evolution) or NR, or a resource block (RB: Resource Block). Therefore, for example, one CE may be formed by one subcarrier in the frequency axis direction and one symbol in the time axis direction. Alternatively, for example, one CE may be formed by a plurality of subcarriers in the frequency axis direction and a plurality of symbols in the time axis direction. Alternatively, for example, one CE may be formed by one subcarrier in the frequency axis direction and a plurality of symbols in the time axis direction, or by a plurality of subcarriers in the frequency axis direction and one symbol in the time axis direction.
  • RE Resource Element
  • RB Resource Block
  • one CE may be formed by one or a plurality of slots or minislots in the time axis direction.
  • the time axis direction may be defined by the smallest time unit of the packet.
  • a slot may be defined as the smallest time unit for transmitting a packet.
  • a slot may be formed with, for example, one or more symbols.
  • each resource shown in FIG. 3 may include one CE.
  • the length of each resource in the frequency axis direction may be one subchannel, and the length in the time axis direction may be one slot.
  • M F and M T are, for example, the packet size of the packet for transmitting data (or the data amount of data), the required delay amount, or the V2X communication It can be changed (or controlled) depending on all or part of the channel state.
  • a packet size tens of thousands of bytes, the larger, it is possible to increase the M F and M T. Also, for example, the shorter the required delay amount, the smaller M T can be. Furthermore, for example, as bad if the channel condition is poor, by increasing at least one of M F and M T, it is possible to increase the Channel Coding Gain.
  • M F and M T are determined, for example, by the representative terminal 100 that monitors the communication status of other terminals, and are included in the SCI and transmitted from the representative terminal 100 to other terminals using the PSCCH. Good.
  • M F and M T may be included in, for example, an RRC message or a control signal and transmitted from the base station 200 to the terminal 100.
  • M F and M T may be predetermined as a system at the time of factory shipment, for example.
  • communication using subchannels including CE can be performed both within the coverage range (In-coverage) and outside the coverage range (Out-of-coverage) of the communication system 10.
  • the terminals 100-1 to 100-3 can communicate with each other by using the sub-channel including CE, in either In-coverage or Out-of-coverage.
  • each resource allocated to the terminal v1 may be referred to as a subchannel, for example.
  • FIG. 5 is a diagram illustrating an example of resource allocation of each subgroup included in the V2X group.
  • FIG. 5 shows an example in which one V2X group is formed by three subgroups SG # 1 to # 3.
  • subgroup # 1 includes (6 ⁇ 7) (6 in the frequency axis direction, 7 in the time axis direction) resources.
  • Each resource of subgroup # 1 includes (1 ⁇ 1) (one in the frequency axis direction and one in the time axis direction) CEs.
  • subgroup # 2 includes (3 ⁇ 4) resources. Also, each resource of subgroup # 2 includes 2 ⁇ 1 CEs.
  • subgroup # 3 includes (2 ⁇ 3) resources.
  • Each resource of subgroup # 3 includes 3 ⁇ 2 CEs.
  • the resource size differs for each subgroup. Therefore, for example, when the transmission data amount is larger than that of the other terminals, the terminal v1 can select the resource of the subgroup # 3 and use the resource to transmit the data. Further, for example, when the transmission data amount is smaller than that of other terminals, the terminal v1 may select the resource of the subgroup # 1 and transmit the data.
  • the resource sizes formed in the V2X group are three types in total.
  • the transmission data of the terminal v1 may not be transmitted even if the resource of the largest subgroup # 3 is used. Therefore, there are cases where it is not possible to dynamically change the packet size and transmit data or the like with a total of about three sizes.
  • the number of retransmissions is one. In these examples, the number of retransmissions cannot be changed to multiple times.
  • the resources in the N ⁇ N T subgroups are copied in at least one of the frequency axis direction and the time axis direction. The details will be described below.
  • FIG. 6A shows an allocation example when resources are allocated to terminals v1 to v6 within a certain subgroup. As shown in FIG. 6A, one resource for initial transmission and one resource for retransmission are allocated to each of the terminals v1 to v6. In the following, the resource allocation example of FIG. 6A may be referred to as “Initial Frequency-Time Resource Pattern (FTRP)”.
  • FTRP Inclusive-Time Resource Pattern
  • FIG. 6B is a diagram showing an example of resource allocation after copying in the frequency axis direction.
  • the terminal 100 has all the resources (v1, v1, v2, v3 resources, v2) included in the time domain in the frequency domain for one channel with respect to “Initial FTRP”. , V4, v4, v5 resources and v3, v5, v6, v6 resources) as one unit. Then, the terminal 100 makes a copy for each unit and inserts the copied resource in the frequency axis direction.
  • the terminal 100 inserts each row of “Initial FTRP” into another row with each row as a unit. In this case, when the resource for one row is inserted, the resources thereafter are shifted by one row to the lower frequency side.
  • FIG. 6B shows an example in which the copy destination of the resource is copied to the frequency domain where the frequency of the resource of the copy source is one subchannel and the frequency is low.
  • the insertion destination may be a frequency region different from the copy source frequency region.
  • the resources allocated to the terminals v1, v1, v2, v3 are inserted in the frequency region in which the frequency is one subchannel lower than the resources allocated to the terminals v3, v5, v6, v6. You may.
  • the terminal 100 for example, sets one row of resources (or resource group) in the "Initial FTRP" as one unit, and inserts the copied resource in another row for each unit.
  • FIG. 6B shows an example in which the resources of each row in “Initial FTRP” are all inserted in another row.
  • An example of such resource allocation may be referred to as “Full Rank”.
  • FIG. 6C is a diagram showing an example of such resource allocation.
  • the example of FIG. 6C shows an example in which the resources of the first to third lines and the fifth line with respect to “Full Rank” are targeted for resource allocation.
  • the resource allocation using some of the resources for the “Full Rank” may be referred to as the “Partial Rank”.
  • FIG. 7A is a diagram showing an example of transmission type information (hereinafter, may be simply referred to as “transmission type information”) for each terminal 100.
  • transmission type information hereinafter, may be simply referred to as “transmission type information”.
  • the horizontal axis represents the index of the terminal 100 and the vertical axis represents the transmission type.
  • the transmission type shown in FIG. 7A includes "Initial (number of channels)" and "Repetition (number of channels)".
  • “Initial (number of channels)” represents, for example, the number of subchannels (or resources) used for initial transmission.
  • Repetition indicates, for example, the number of subchannels (or resources) used for retransmission.
  • the terminal # 1 (for example, the terminal v1) is assigned “2” as the number of sub-channels for initial transmission and “2” as the number of sub-channels for retransmission. Also, it indicates that the number of sub-channels of “1” for initial transmission and “2” for retransmission is assigned to the terminal # 2 (for example, the terminal v2).
  • FIG. 6C shows an example in which resources are allocated according to the transmission type information shown in FIG. 7A, for example.
  • the terminal v1 is assigned two sub-channels for initial transmission and two sub-channels for retransmission. Further, to the terminal v2, one subchannel is allocated for initial transmission and two subchannels are allocated for retransmission.
  • the resource allocation of "Partial Rank" shown in FIG. 6C is formed according to the transmission type for each terminal 100 shown in FIG. 7A. Is possible.
  • the terminal v1 can transmit data for initial transmission by using two resources and transmit data for retransmission by using two resources.
  • the terminal v2 it is possible to transmit the data for initial transmission using one resource and transmit the data for retransmission using two resources.
  • the terminal v4 can transmit data for initial transmission by using one resource and transmit data for retransmission by using one resource.
  • the transmission type information shown in FIG. 7A may be transmitted from the base station 200 in the case of In-coverage.
  • the base station 200 transmits the RRC message of the RRC layer and the control signal of the L1 layer including the transmission type information to the terminal 100. Based on this information, the terminal 100 can perform resource allocation of “Partial Rank”.
  • the transmission type information may be transmitted to another terminal by the terminal 100 received from the base station 200 at the time of In-coverage.
  • the terminal 100 may generate the SCI including the transmission type information and transmit the SCI to another terminal, for example.
  • the other terminals perform resource allocation of "Partial Rank" according to the transmission type information received from the terminal 100.
  • the representative terminal 100 may monitor the communication status of another terminal and generate the transmission type information based on the monitoring result. In this case, the representative terminal 100 may transmit the generated transmission type information to another terminal using SCI. The representative terminal 100 and other terminals perform resource allocation of “Partial Rank” according to the transmission type information generated by the representative terminal 100.
  • the terminal 100 may generate the resource allocation of “Partial Rank” according to the transmission type information without generating the resource allocation of “Full Rank” after determining “Initial FTRP”.
  • FIG. 8A is a diagram showing an example of “Initial FTRP”.
  • FIG. 8A is the same as FIG. 6A.
  • FIG. 8B is a diagram showing an example of resource allocation after copying in the time axis direction.
  • the terminal 100 has all resources (v1, v2, v3 resources, v1, v4, v5 resources) included in the frequency axis direction within the period (eg, 1 slot) corresponding to one subchannel with respect to “Initial FTRP”. , V2, v4, v6 resources and v3, v5, v6 resources) as one unit. Then, the terminal 100 makes a copy for each unit and inserts the copied resource in the time axis direction. In FIG. 8B, the terminal 100 inserts each column in “Initial FTRP” into one column as a unit and into another column.
  • FIG. 8B shows an example in which the destination of the copied resource is copied to the time domain of the slow timing by the time corresponding to one subchannel in the time domain of the resource of the copy source.
  • the insertion destination may be a time domain different from the copy source time domain.
  • the terminal 100 delays the resources allocated to the terminals v1, v2, and v3 by the time corresponding to one subchannel than the resources allocated to the terminals v3, v5, and v6. You may copy in the time domain of timing.
  • the terminal 100 inserts the resources assigned to the terminals v1, v2, v3 into the time domain between the resources assigned to the terminals v1, v4, v5 and the resources assigned to the terminals v2, v4, v6. Good. In this case, when the resource for one column is inserted, the resources thereafter are shifted by one column toward the later timing.
  • the terminal 100 for example, sets the resource (or resource group) for one column in "Initial FTRP" as one unit, and inserts the copied resource in this column in this unit.
  • FIG. 8B shows an example in which the resources in each column in “Initial FTRP” are all inserted in another column.
  • FIG. 8B shows an example of “Full Rank”.
  • resource allocation is performed for “Full Rank” according to transmission type information, using resources in a specific column and not using resources in other columns. It is possible.
  • FIG. 8C is a diagram showing an example of resource allocation when such allocation is performed.
  • FIG. 8C shows an example of “Partial Rank”.
  • FIG. 7B is a diagram showing an example of the transmission type information.
  • “Number of Repetitions” represents, for example, the number of retransmissions.
  • the number of subchannels for initial transmission is “1”
  • the number of retransmissions is “2”
  • the terminal # 4 for example, the terminal v4.
  • the number of sub-channels for initial transmission is “1”
  • the number of retransmissions is “1”.
  • FIG. 8C shows an example when resources are allocated according to the transmission type information shown in FIG. 7B, for example.
  • the terminal 100 allocates the resource allocated first to the terminal v1 in the frequency axis direction and to the terminal v1 in the time axis direction according to the transmission type information for the initial transmission and the frequency axis.
  • the two resources allocated first in the direction and second and third in the time axis direction are allocated for retransmission.
  • the terminal 100 transmits the second resource in the frequency axis direction and the third resource in the time axis direction to the terminal v4 for the first transmission, and the second resource in the frequency axis direction and the fourth resource in the time axis direction for retransmission. Assign as.
  • the maximum number of retransmissions is two. However, when the number of retransmissions of three or more is specified in “Number of Repetitions”, the terminal 100 retransmits the retransmissions. Depending on the number of times, copying in the time axis direction may be performed and resources for retransmission may be allocated.
  • the terminal 100 for example, allocates the “Partial Rank” without passing through the “Full Rank” according to the transmission type information after performing the resource allocation by “Initial FTRP”. May be.
  • the transmission type information may also be transmitted from the base station 200 by an RRC message, a control signal, etc. in the time axis direction.
  • the representative terminal 100 may use SCI to transmit the transmission type information to another terminal.
  • specific subchannel formation can be configured by RRC or SCI.
  • the terminal 100 can perform resource allocation by combining the copy in the frequency axis direction and the copy in the time axis direction. There are the following four combinations, for example.
  • the terminal 100 After allocating the resource by “Initial FTRP”, the terminal 100 performs copying in the frequency axis direction (after that, does not perform copying in the time axis direction).
  • FIG. 9A is a diagram showing an example of resource allocation by “Initial FTRP” in a certain resource group.
  • FIG. 9A is the same as FIG.
  • FIG. 9B is a diagram showing an example of resource allocation after copying in the frequency axis direction for “Initial FTRP”.
  • the terminal 100 copies the resource in the first row of “Initial FTRP” twice, and assigns it to the sub-channel next to the resource in the first row and each frequency region of the next sub-channel. Insert and shift resources in each subsequent row.
  • the terminal 100 copies the resource on the second line of “Initial FTRP”, inserts the copied resource into the area of the subchannel next to the resource on the second line, and shifts the resource on each line thereafter.
  • the terminal 100 performs copying in the frequency axis direction as Step-2 (a).
  • FIG. 10 is a diagram showing an example of resource allocation after copying in the time axis direction thereafter.
  • FIG. 10 shows an example in which the resource in the second column is copied with respect to the resource shown in FIG. 9B, inserted in the area at the next timing, and the resources thereafter are shifted in the time axis direction. ing.
  • the terminal 100 performs copying in the time axis direction as Step-2 (b).
  • Step-2 (a) and Step-2 (b) the terminal 100 performs such a copy according to the transmission type information (for example, FIGS. 7A and 7B).
  • the terminal 100 performs copying in the frequency axis direction and the time axis direction. Therefore, the terminal 100 uses three pieces of information of “Initial (number of channels)”, “Repetition (number of channels)”, and “Number of Repetitions” as the transmission type information.
  • the terminal 100 uses the resource (eg, FIG. 10) allocated in Step-2 (b) to transmit and retransmit data and control signals to other terminals.
  • the resource eg, FIG. 10 allocated in Step-2 (b) to transmit and retransmit data and control signals to other terminals.
  • FIG. 11A is a diagram illustrating an example of resource allocation by “Initial FTRP” in a certain resource group.
  • FIG. 11A is the same as FIG. 9A and FIG.
  • FIG. 11B is a diagram showing an example of resource allocation after copying in the time axis direction for “Initial FTRP”.
  • FIG. 11 (B) shows an example in which the resource in the second column is copied for "Initial FTRP", inserted in the area of the next timing, and the resources thereafter are shifted in the time axis direction. There is.
  • the terminal 100 performs copying in the time axis direction as Step-2 (b).
  • FIG. 12 is a diagram showing an example of resource allocation after copying in the frequency axis direction thereafter.
  • the resource in the first row is copied twice, and the resource is inserted into the frequency domain of the subchannel next to the resource in the first row and the subchannel next to the subchannel. , Shift the resource of each line after.
  • terminal 100 copies the resource in the second row with respect to the resource shown in FIG. 11B, inserts the copied resource in the frequency domain of the subchannel next to the resource in the second row, and thereafter. Shift the resources in each row of.
  • the terminal 100 performs copying in the frequency axis direction as Step-2 (a).
  • the transmission type information includes, for each terminal, three pieces of information, “Initial (number of channels)”, “Repetition (number of channels)”, and “Number of Repetitions”.
  • the terminal 100 copies in the time axis direction and then in the frequency axis direction according to these pieces of information.
  • Step-2 (b) is performed first, and then Step -2 (a) is performed.
  • Step-2 (a) is performed first, then Step-2 (b) is performed, or Step-2 (b) is performed first, and then Step-2 (a) is performed, the final
  • the resource allocation results are the same as shown in FIGS. 10 and 12, for example.
  • the terminal 100 transmits and retransmits data and control signals to other terminals by using the resources (eg, FIG. 12) allocated in Step-2 (a).
  • Step-2 (a) copies in the frequency axis direction to the “Initial FTRP”.
  • FIG. 9B is an example thereof.
  • the terminal 100 terminates the resource allocation and, for example, uses the resource shown in FIG. 9B to transmit and retransmit data and control signals.
  • the terminal 100 copies in the frequency axis direction and does not copy in the time axis direction, it is possible to allocate resources according to the packet size and transmit the resources, for example.
  • FIG. 11A is an example thereof.
  • Step-2 (b) copies the "Initial FTRP" in the time axis direction.
  • FIG. 11B is an example thereof.
  • the terminal 100 terminates the resource allocation and, for example, uses the resource shown in FIG. 11B to transmit and retransmit data and control signals.
  • the terminal 100 Since the terminal 100 performs copying in the time axis direction and does not perform copying in the frequency axis direction, for example, it becomes possible to perform resource allocation and transmission according to the number of retransmissions.
  • FIG. 13 is a diagram illustrating an example of resource allocation after copying in the frequency axis direction and copying in the time axis direction. Specifically, in FIG. 13, copying in both the frequency axis direction and the time axis direction is performed in the sub group (SG: Sub Group) # 1, and copying in the frequency axis direction is performed in the sub group # 2. , Subgroup # 3 represents an example in which copying in the time axis direction is performed.
  • each resource of subgroup # 3 which has the largest resource size has a later time (or timing) for transmitting data and control signals than each resource of other subgroups. Therefore, the terminal 100 to which the resource of the subgroup # 3 is allocated may wait for transmission of data and control signals as compared with other terminals.
  • randomization is performed. Randomization is performed in V2X group units, for example. By the randomization, for example, it becomes possible for each terminal 100 to equalize the time for transmitting data and control signals, and it becomes possible to perform fair allocation of resources.
  • FIG. 14A and 14B are diagrams showing an example of randomization.
  • randomization is first performed in the frequency axis direction as shown in FIG. 14 (A), and then randomization is performed in the time axis direction as shown in FIG. 14 (B). Be seen.
  • the randomization in the frequency axis direction in the example illustrated in FIG. 14A, in the first resource in the time axis direction, the resource assigned to the terminal v1 of the subgroup SG # 1 and the resource assigned to the terminal v3 are exchanged in the frequency axis direction. Further, in the second resource in the time axis direction, the resource assigned to the terminal v2 and the resource assigned to the terminal v3 are exchanged in the frequency axis direction.
  • Randomization in the frequency axis direction is performed, for example, if one resource is exchanged with another resource within the range of resources in the frequency axis direction allocated within a period corresponding to each subchannel? It may be an exchange. Therefore, for example, in FIG. 14A, in the first resource in the time axis direction, the resource assigned to the terminal v2 and the resource assigned to the terminal v3 may be exchanged. Randomization in the frequency axis direction is performed, for example, by exchanging resources allocated to each terminal 100 in the frequency axis direction.
  • the first resource is moved to the fourth resource and the second resource is moved to the sixth resource in the time axis direction. ..
  • the resources in the frequency axis direction included in the period corresponding to each sub-channel are set as one set, and each set is moved to the period corresponding to another sub-channel. I am trying. In this case, as long as a certain set and another set are not replaced in the same period, the period may be moved to any period. Randomization in the time axis direction is performed, for example, by setting all resources included in the frequency axis direction as one unit within a period corresponding to one subchannel, and randomly switching in that unit in the time axis direction.
  • randomization is, for example, randomly swapping resources in the frequency axis direction and the time axis direction.
  • the resource of the terminal v1 allocated in the second period in the time axis direction and the resource of the terminal v5 allocated in the third period are allocated. It cannot be exchanged. In the randomization, it is not allowed to exchange resources beyond the period corresponding to each subchannel.
  • resource exchange is performed within the V2X group. Resources cannot be exchanged between V2X groups.
  • FIG. 15 is a flowchart showing an operation example of resource allocation.
  • the terminal 100 When the terminal 100 starts the process (S10), it subgroups a plurality of terminals (S11). For example, the subgroup management unit 1110 sequentially allocates each terminal 100 to each subgroup.
  • the terminal 100 performs resource allocation processing within each subgroup (S12).
  • FIG. 16 is a flowchart showing an example of resource allocation processing.
  • Fig. 16 shows a case where the frequency axis direction is copied first, and then the time axis direction is copied (the above-mentioned ⁇ 6.3.1 Frequency axis direction copy, and then time axis direction copy).
  • 2 is a flowchart of an example of a case of performing).
  • the terminal 100 determines an initial resource pattern (S121).
  • the initial resource pattern is, for example, “Initial FTRP” described with reference to FIG.
  • the sub-group management unit 1110 the packet size, the required delay, or on the basis of the whole or part of the channel state, and determining a M F and M T for each sub-group, each resource (or each sub-channel) Determine the number of CEs included in. Accordingly, the subgroup management unit 1110 can determine the size of each resource for each subgroup, for example. Then, the subgroup management unit 1110 allocates, for example, the resource for initial transmission (initial) and the resource for retransmission (repetition) to each terminal 100. As a result, for example, it becomes possible to determine the processing resource pattern shown in FIG. 3 or FIG.
  • the subgroup management unit 1110 may receive data from the application processing unit in the processor 110 and calculate the packet size (or data amount) of the packet that transmits the data. Further, the subgroup management unit 1110 may read the required delay amount from the memory 120. Further, the subgroup management unit 1110 may receive, from the reception control unit 114, the information on the channel state measured by the reception control unit 114. The subgroup management unit 1110 may determine M F and M T for each subgroup based on the packet size thus obtained, the required delay, or all or part of the channel condition.
  • the subgroup management unit 1110 can generate an SCI including the determined M F and M T and include the SCI in the control signal to transmit the SCI, thereby transmitting the SCI to another terminal using the PSCCH. Become. Note that when M F and M T are determined by another terminal, the subgroup management unit 1110 may extract M F and M T from the control signal transmitted from another terminal via the reception control unit 114. Good.
  • the base station 200 may determine M F and M T.
  • the subgroup management unit 1110 receives the RRC message and the control signal transmitted from the base station 200 via the reception control unit 114, and extracts the M F and M T from the received RRC message and the control signal. Good.
  • the base station 200 determines M F and M T for each subgroup, for example.
  • M F and M T may be predetermined.
  • the memory 120 stores, for example, M F and M T different for each subgroup.
  • the terminal 100 copies the initial resource pattern in the frequency axis direction (S122).
  • This process is a process corresponding to the above-described Step-2 (a) (for example, FIG. 9B).
  • the subgroup management unit 1110 performs the following processing.
  • the subgroup management unit 1110 performs copying in the frequency axis direction according to the transmission type information (for example, FIG. 7A). Specifically, according to the transmission type information, the subgroup management unit 1110 regards resources (or resource groups) existing in the time axis direction in the frequency domain of one subchannel as one unit in the “Initial FTRP”. , Copy each unit. Then, the subgroup management unit 1110 inserts the copied resource into another frequency domain.
  • the other frequency region that is the insertion destination is a region different from the frequency region in which the resource of the copy source is arranged, and is within the range of the frequency region that can be used by the terminal 100.
  • the subgroup management unit 1110 performs copying in the frequency axis direction, for example, by copying once or multiple times according to the transmission type information.
  • the transmission type information may be generated by the subgroup management unit 1110 if the terminal 100 is the representative terminal, as described above.
  • the subgroup management unit 1110 receives data and control signals transmitted from other terminals via the reception control unit 114, and generates transmission type information based on the received data and control signals. Good.
  • the subgroup management unit 1110 may generate the SCI including the transmission type information and transmit the transmission type information to another terminal as a PSCCH via the resource control unit 112 or the like.
  • the subgroup management unit 1110 receives the SCI transmitted from the representative terminal via the reception control unit 114 or the like, and extracts the transmission type information from the SCI. It becomes possible to do.
  • the subgroup management unit 1110 extracts transmission type information from the received RRC message or control signal. It is also possible.
  • the subgroup management unit 1110 performs copying in the time axis direction for the resource that has been copied in the frequency axis direction (S123).
  • This process is a process corresponding to Step-2 (b) (for example, FIG. 10) described above.
  • the subgroup management unit 1110 performs the following processing.
  • the subgroup management unit 1110 performs copying in the time axis direction according to the transmission type information (for example, FIG. 7B). Specifically, the subgroup management unit 1110, based on the transmission type information, with respect to the resource copied in the frequency axis direction, all resources existing in the frequency axis direction (or within the period corresponding to one resource) (or Resource group) is set as one unit, and each unit is copied. Then, the subgroup management unit 1110 inserts the copied resource into another time domain.
  • the time domain of the insertion destination is, for example, a domain different from the time domain in which the resource of the copy source is arranged, and is within the frequency domain usable by the terminal 100.
  • the subgroup management unit 1110 performs copying in the time axis direction by, for example, copying a predetermined resource once or plural times according to the transmission type information.
  • FIG. 17 is a flowchart showing an example in which copying is performed in the time axis direction first and then in the frequency axis direction.
  • the terminal 100 When the terminal 100 starts the resource allocation process (S120), the terminal 100 determines an initial resource pattern (S121).
  • the terminal 100 copies the initial resource pattern in the time axis direction (S123).
  • This process is a process corresponding to Step-2 (b) described above (for example, FIG. 11B).
  • the subgroup management unit 1110 uses, according to the transmission type information, a resource (or a resource group) existing at the same time as the time corresponding to one resource in the time axis direction with respect to the initial resource pattern as one unit, Make a copy for each unit. Then, the subgroup management unit 1110 inserts the copied resource into another time domain.
  • the other time regions are the same as those in S123 of FIG.
  • the terminal 100 performs copying in the frequency axis direction on the resource that has been copied in the time axis direction (S122).
  • This process is a process corresponding to the above-mentioned Step-2 (a) (for example, FIG. 12).
  • the subgroup management unit 1110 sets the resource (or resource group) existing in the same subchannel in the frequency axis direction as one unit for the resource copied in the time axis direction according to the transmission type information. , Copy each unit. Then, the subgroup management unit 1110 inserts the copied resource into another frequency domain.
  • the other frequency regions are the same as those in S122 of FIG.
  • the terminal 100 ends the resource allocation processing (S124).
  • the terminal 100 performs randomization within the V2X group (S13).
  • the subgroup management unit 1110 randomizes the resources after the resource allocation processing (S12) in the frequency axis direction (for example, FIG. 14A), and then performs the randomization in the time axis direction. (For example, FIG. 14B).
  • the terminal 100 ends the resource allocation (S14).
  • the subgroup management unit 1110 outputs the allocation result to the used resource control unit 112.
  • the used resource control unit 112 instructs the transmission control unit 113 to transmit a control signal or data by using the resource assigned to the own station according to the assignment result.
  • the transmission control unit 113 transmits control signals and data using the allocated resources according to the instruction. In this case, as shown in FIG. 10 and FIG. 12, the transmission control unit 113 uses one or more resources for initial transmission to transmit control signals and data, and uses one or more resources for retransmission. And retransmit the control signal and data.
  • FIG. 18 is a diagram illustrating a configuration example of the base station 200.
  • the base station 200 includes a processor 210, a memory 220, a wireless communication unit 230, and an antenna 240.
  • the processor 210 includes a scheduler 211, a used resource control unit 212, and a transmission control unit 213.
  • the scheduler 211 generates transmission type information and outputs the generated transmission type information to the used resource control unit 212.
  • the scheduler 211 When including the transmission type information in the control signal for transmission, the scheduler 211 generates such a control signal and outputs the generated control signal to the used resource control unit 212. Further, when including the transmission type information in the RRC message for transmission, the scheduler 211 may generate an RRC message including the transmission type information and output the generated RRC message to the used resource control unit 212.
  • the used resource control unit 212 controls the resource of the control channel and the resource of the data channel according to the resource allocation result included in the control signal output from the scheduler 211.
  • the transmission control unit 213 receives, for example, an RRC message from the scheduler 211 via the used resource control unit 212, and performs an error correction coding process (hereinafter, referred to as “coding process”) on the received RRC message. .) And so on.
  • the transmission control unit 213 also performs coding processing, modulation processing, and the like on the control signal received from the scheduler 211 via the used resource control unit 212.
  • the transmission control unit 213 maps, for example, a control signal to a control channel when transmitting a control signal and an RRC message to each resource of a data channel when transmitting an RRC message, according to an instruction from the used resource control unit 212. .. Then, the transmission control unit 113 transmits the transmission signal obtained by the mapping via the wireless communication unit 230.
  • the wireless communication unit 230 converts (up-converts) the transmission signal into a wireless signal in the wireless band, and outputs the converted wireless signal to the antenna 240.
  • the antenna 240 transmits a radio signal to the terminal 100 in the In-coverage range.
  • the base station 200 can transmit the RRC message including the transmission type information and the control signal to the terminal 100 in the In-coverage range.
  • the terminal 100 performs the copy in the frequency axis direction on the resource after the copy in the initial resource pattern and the time axis direction. Thereby, for example, resources can be increased and the packet size can be dynamically increased. Further, the terminal 100 makes a copy in the frequency axis direction according to the transmission type information for each terminal, and can dynamically change the packet size for each terminal including its own station.
  • the terminal 100 performs copying in the time axis direction for the resource after the initial resource pattern and the copying in the frequency axis direction. This makes it possible to control the number of retransmissions, for example, by setting the number of retransmissions to 1 or 2 or more. Furthermore, the terminal 100 performs copying in the time axis direction according to the transmission type information for each terminal, and can control the number of retransmissions for each terminal. By copying in the time axis direction, it is possible to increase the number of resources as compared with the resources before copying, so that it is also possible to dynamically increase the packet size for each terminal.
  • the resource allocation shown in FIGS. 10 and 12 is performed, for example, by the terminal 100 on the transmitting side.
  • the terminal 100 on the transmitting side determines the size of each resource and uses the allocated resource by the resource allocation shown in FIGS. 10 and 12 and the randomization shown in FIGS. 14 (A) and 14 (B).
  • Control signals and data can be transmitted.
  • the reception-side terminal 100 (for example, the reception control unit 114 or the wireless communication unit 130) is transmitted from the transmission-side terminal by sensing by using the resource of the control channel allocated by the transmission-side terminal. Receive control signals.
  • the terminal 100 on the receiving side grasps the resource (for example, FIG. 10 or FIG. 12) allocated by the terminal on the transmitting side based on the SCI included in the control signal. Then, the receiving-side terminal 100 (for example, the reception control unit 114 or the wireless communication unit 130) receives the data transmitted from the transmitting-side terminal by sensing, using the resources allocated by the transmitting-side terminal. It becomes possible.
  • the randomization shown in FIGS. 14A and 14B is performed first in the frequency axis direction and then in the time axis direction.
  • the randomization may be performed first in the time axis direction and then in the frequency axis direction.
  • the terminal 100 uses all resources including the copied resources to transmit data and control signals.
  • a part of all the resources including the copied resources may not be assigned to the terminal 100.
  • the resource with redundancy it is possible to use it for transmitting emergency data, for example.

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Abstract

La présente invention concerne un dispositif terminal qui comprend : une unité de gestion de sous-groupes dans laquelle, parmi un total de N × NT ressources obtenues par multiplication de N (N représente un entier non inférieur à 1) ressources dans la direction d'un axe des fréquences par NT (NT représente un entier non inférieur à 2) ressources dans la direction d'un axe des temps, les N ressources dans la direction de l'axe des fréquences à la première position dans la direction de l'axe des temps sont attribuées en tant que premières ressources à un dispositif terminal parmi des dispositifs terminaux, et les deuxième à NT-ième ressources dans la direction de l'axe des temps à la première position dans la direction de l'axe des fréquences sont attribuées en tant que secondes ressources à ce dispositif terminal, les deuxième à N-ième ressources dans la direction de l'axe des fréquences à la deuxième position dans la direction de l'axe des temps sont attribuées en tant que premières ressources à un autre des dispositifs terminaux, les troisième à NT-ième ressources dans la direction de l'axe des temps à la deuxième position dans la direction de l'axe des fréquences sont attribuées en tant que secondes ressources à cet autre des dispositifs terminaux, ces attributions sont répétées pour les ressources restantes parmi les N × NT ressources de façon à attribuer les premières et secondes ressources à une pluralité des dispositifs terminaux, et en outre, au moins soit les N ressources dans la direction de l'axe des fréquences soit les NT ressources dans la direction de l'axe des temps sont copiées par rapport aux N × NT ressources attribuées à la pluralité des dispositifs terminaux ; et une unité de commande de transmission qui transmet un signal de commande ou des données à l'aide des premières ressources et qui retransmet le signal de commande ou les données à l'aide des secondes ressources.
PCT/JP2018/041456 2018-11-08 2018-11-08 Dispositif terminal, système de communication et procédé de communication WO2020095403A1 (fr)

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Title
FUJITSU: "Discussion on Subframe-based Resource Selection Parameters in Mode-4 NR-V2X", 3GPP DRAFT; R1-180829, 24 August 2018 (2018-08-24), Gothenburg, Sweden, pages 1 - 7, XP051515680 *
FUJITSU: "Orthogonal Resource Scheduling based Multicast NR-V2X Transmission", 3GPP DRAFT; R1-1810591, 12 October 2018 (2018-10-12), Chengdu, China, pages 1 - 14, XP051517998 *
INTERDIGITAL INC: "Resource Allocation for NR V2X", 3GPP DRAFT; R1-1808599, 24 August 2018 (2018-08-24), Gothenburg, Sweden, pages 1 - 4, XP051515976 *

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