WO2023238388A1 - 無線通信装置及び第２無線通信装置 - Google Patents

無線通信装置及び第２無線通信装置 Download PDF

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Publication number
WO2023238388A1
WO2023238388A1 PCT/JP2022/023466 JP2022023466W WO2023238388A1 WO 2023238388 A1 WO2023238388 A1 WO 2023238388A1 JP 2022023466 W JP2022023466 W JP 2022023466W WO 2023238388 A1 WO2023238388 A1 WO 2023238388A1
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WIPO (PCT)
Prior art keywords
wireless communication
communication device
base station
terminal device
data
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/023466
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English (en)
French (fr)
Japanese (ja)
Inventor
太田好明
河▲崎▼義博
矢野哲也
堀貴子
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Fujitsu Ltd
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Fujitsu Ltd
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Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP2024526199A priority Critical patent/JP7853612B2/ja
Priority to PCT/JP2022/023466 priority patent/WO2023238388A1/ja
Priority to CN202280096571.2A priority patent/CN119301997A/zh
Publication of WO2023238388A1 publication Critical patent/WO2023238388A1/ja
Priority to US18/971,121 priority patent/US20250119873A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/36—Reselection control by user or terminal equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/005—Transmission of information for alerting of incoming communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/02—Arrangements for increasing efficiency of notification or paging channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states

Definitions

  • the present invention relates to a wireless communication device and a second wireless communication device.
  • a plurality of states are defined for a terminal device in a wireless communication system in connection with a base station device.
  • the terminal device has, for example, an RRC_INACTIVE state (temporarily stopped state) in addition to an RRC_CONNECTED state (communicating state) and an RRC_IDLE state (unconnected state).
  • the terminal device achieves power saving by turning off the wireless unit in the RRC_INACTIVE state.
  • the terminal device turns on the wireless unit at the timing of receiving paging (for example, RAN Paging) and receives paging, for example.
  • Paging is a message that calls a terminal device.
  • the terminal device turns on the wireless unit to receive paging, it performs measurement to aggregate the timing at which the wireless unit turns on, thereby reducing power consumption due to turning the wireless unit on and off. .
  • the terminal device When mobility occurs in the RRC_INACTIVE state, the terminal device performs celery selection, for example.
  • Cell reselection is, for example, a process of measuring signals of cells other than the cell (serving cell) in which the terminal device is located and moving to a more suitable cell.
  • the terminal device may perform small data transmission (SDT) with the base station device in the RRC_INACTIVE state.
  • SDT small data transmission
  • one disclosure provides a wireless communication device and a second wireless communication device that efficiently transmit and receive small data in mobility in the RRC_INACTIVE state.
  • a wireless communication device capable of first type data communication for transmitting and receiving first type data with an opposite wireless communication device in a first mode, wherein the first control is transmitted from the opposite wireless communication device in the first mode.
  • the opposing wireless communication device is identified, and the first type data communication is It has a control unit that can carry out communication control that continues in the second communication range.
  • One disclosure allows efficient transmission and reception of small data in celery selection in the RRC_INACTIVE state.
  • FIG. 1 is a diagram showing an example of wireless communication in a wireless communication system 1.
  • FIG. 2 is a diagram showing a configuration example of the wireless communication system 10.
  • FIG. 3 is a diagram showing a configuration example of the terminal device 100.
  • FIG. 4 is a diagram illustrating a configuration example of the base station device 200.
  • FIG. 5 is a diagram showing an example of the sequence of the first method.
  • FIG. 6 is a diagram illustrating an example of a sequence of downlink data transmission using the Cell Update method.
  • FIG. 7 is a diagram illustrating an example of a sequence of uplink data transmission using the Cell Update method.
  • FIG. 8 is a diagram illustrating an example of a transmission trigger for Cell Update.
  • FIG. 9 is a diagram illustrating an example of new cell selection criteria for celery selection.
  • FIG. 9 is a diagram illustrating an example of new cell selection criteria for celery selection.
  • FIG. 10 is a diagram showing an example of the timer value of the SDT Failure Timer.
  • FIG. 11 is a diagram illustrating an example of the maximum number of RLC retransmissions.
  • FIG. 12 is a diagram showing an example of ResumeCause.
  • FIG. 13 is a diagram showing an example of an SDT sequence in UE-specific RNA.
  • FIG. 14 is a diagram illustrating an example of an SDT sequence in UE-specific RNA.
  • FIG. 15 is a diagram showing an example of ResumeCause.
  • the wireless communication system 1 includes wireless communication devices 3-1 and 3-2 and an opposing wireless communication device 2.
  • the wireless communication devices 3-1 and 2 and the opposing wireless communication device 2 are wirelessly connected to each other and transmit and receive data wirelessly.
  • the wireless communication devices 3-1 and 2 and the opposing wireless communication device 2 support type 1 data communication in which type 1 data is transmitted and received.
  • the wireless communication devices 3-1 and 2 and the opposing wireless communication device 2 each have a processor.
  • the processor executes programs stored in the wireless communication devices 3-1, 2 and the opposing wireless communication device 2, and constructs the control units 5-1, 2 and the second control unit 4.
  • the processing executed by the wireless communication devices 3-1 and 2 described below may be understood to be executed by the control units 5-1 and 2. Further, the processing executed by the opposite wireless communication device 2 described below may be understood to be executed by the second control unit 4.
  • the first mode is a mode in which type 1 data can be transmitted and received at a predetermined timing.
  • the opposing wireless communication device 2 turns on the wireless section at a predetermined timing, for example, and becomes ready to receive signals (messages, channels).
  • FIG. 1 is a diagram showing an example of communication control for type 1 data communication in the wireless communication system 1.
  • the wireless communication devices 3-1 and 3-2 can perform communication control to continue type 1 data communication.
  • the wireless communication device 3-1 has a communication area C1 indicating a communicable range.
  • the wireless communication device 3-2 has a communication area C2 indicating a communicable range.
  • the communication area C1 may be referred to as a first communication range C1
  • the communication area C2 may be referred to as a second communication range C2.
  • the opposing wireless communication device 2 is in the first mode, is located within the first communication range C1, and is performing first type data communication with the wireless communication device 3-1 (S1).
  • the opposing wireless communication device 2 moves, for example, in the direction of arrow D1.
  • the opposing wireless communication device 2 searches for a new communication area at a certain timing.
  • the opposing terminal device 2 decides to change (move) the cell with which communication will be performed from the first communication range C1 to the second communication range C2.
  • the opposing wireless communication device 2 transmits a first control signal to the wireless communication device 3-1 in the first communication range C1 (S2).
  • the wireless communication device 3-1 receives the first control signal (S2), it stops transmitting and receiving data in the first type data communication, for example.
  • the opposing wireless communication device 2 transmits a second control signal to the wireless communication device 3-2 in the second communication range C2 (S3).
  • the wireless communication device 3-2 identifies the opposite wireless communication device 2 (recognizes that the opposite wireless communication device 2 has moved to the second communication range C2), and Seed data communication is executed in the second communication range C2 (S4). Thereby, the wireless communication device 3-2 can continue the first type data communication in the second communication range C2.
  • the wireless communication devices 3-1 and 3-2 may be one wireless communication device.
  • FIG. 2 is a diagram showing a configuration example of the wireless communication system 10.
  • the wireless communication system 10 includes base station devices 200-1 and 200-2 and a terminal device 100.
  • the wireless communication system 10 is, for example, a wireless communication system that supports uplink and downlink SDT in the RRC_INACTIVE state.
  • the small data indicates, for example, data of a predetermined size or less.
  • the predetermined size is a size that can be transmitted in the method shown below (for example, a size according to the channel size, radio frame size, etc.).
  • the terminal device 100 is a communication device that wirelessly connects to the base station device 200-1 or 200-2 and sends and receives data, and is, for example, a smartphone or a tablet terminal. In FIG. 2, there is one terminal device 100, but a plurality of terminal devices may exist.
  • the base station devices 200-1 and 200-2 are compatible with various communication generations (eg, 5G, Beyond 5G, etc.), for example.
  • the base station device 200 may be configured with one device, or may be configured with multiple devices such as a CU (Central Unit), a DU (Distributed Unit), and an RU (Radio Unit).
  • CU Central Unit
  • DU Distributed Unit
  • RU Radio Unit
  • the base station devices 200-1 and 2 have communication areas (cells) C200-1 and C200-2, respectively.
  • the communication area is, for example, a range where wireless communication with the terminal device 100 is possible.
  • the terminal device 100 wirelessly connects to the base station device 200-1 and performs wireless communication W101. Then, the terminal device 100 ends the communication, executes a predetermined sequence, and transitions to the RRC_INACTIVE state.
  • the terminal device 100 moves, for example, in the direction of arrow D100. Then, at a certain timing, the terminal device 100 receives a signal from a cell (cell C200-2) other than the serving cell (cell C200-1) and measures the radio wave condition. When the measurement result satisfies a predetermined condition, the terminal device 100 performs cell reselection on the measured cell.
  • the terminal device 100 performs celery selection from the base station device 200-1 to the base station device 200-2. Further, when the base station device 200 is configured with a plurality of DUs and RUs and has a plurality of cells, the terminal device 100 may perform celery selection to different cells in the same base station device 200. When celery selection to different cells in the same base station device 200 is performed, base station device 200-1 (base station device before movement) and base station device 200-2 (base station device after movement) in the subsequent sequence ) may be read as the cell before movement and the cell after movement, respectively.
  • FIG. 3 is a diagram showing a configuration example of the terminal device 100.
  • the terminal device 100 includes a CPU (Central Processing Unit) 110, a storage 120, a memory 130, a wireless communication circuit 150, and an antenna 151.
  • CPU Central Processing Unit
  • the storage 120 is an auxiliary storage device such as a flash memory, an HDD (Hard Disk Drive), or an SSD (Solid State Drive) that stores programs and data.
  • the storage 120 stores a terminal communication program 121 and a terminal-side small data communication program 122.
  • the memory 130 is an area into which programs stored in the storage 120 are loaded.
  • the memory 130 may also be used as an area for programs to store data.
  • the wireless communication circuit 150 is a device that performs wireless communication with the base station device 200 and other terminal devices 100.
  • the wireless communication circuit 150 includes an antenna 151.
  • the antenna 151 includes, for example, a directional antenna that can control the direction of transmission and reception of radio waves.
  • the CPU 110 is a processor that loads a program stored in the storage 120 into the memory 130, executes the loaded program, constructs each part, and implements each process.
  • the CPU 110 executes the terminal communication program 121 to construct a second communication unit and perform terminal communication processing.
  • the terminal communication process is a process of wirelessly connecting with the base station device 200 and other terminal devices 100 and performing wireless communication.
  • the CPU 110 executes the terminal-side small data communication program 122 to construct a second control unit and perform terminal-side small data communication processing.
  • the terminal-side small data communication process is a process in which the terminal device 100 controls transmission and reception of small data between the terminal device 100 in the RRC_INACTIVE state and the base station device 200.
  • FIG. 4 is a diagram illustrating a configuration example of the base station device 200.
  • Base station device 200 includes CPU 210, storage 220, memory 230, wireless communication circuit 250, and antenna 251.
  • the storage 220 is an auxiliary storage device such as a flash memory, HDD, or SSD that stores programs and data.
  • the storage 220 stores a base station communication program 221 and a base station side small data communication program 222.
  • the memory 230 is an area into which programs stored in the storage 220 are loaded.
  • the memory 230 may also be used as an area for programs to store data.
  • the wireless communication circuit 250 is a device that performs wireless communication with the terminal device 100.
  • the wireless communication circuit 250 includes an antenna 251.
  • the antenna 251 includes, for example, a directional antenna that can control the direction of transmission and reception of radio waves.
  • the CPU 210 is a processor that loads a program stored in the storage 220 into the memory 230, executes the loaded program, constructs each part, and implements each process.
  • the CPU 210 executes the base station communication program 221 to build a communication unit and perform communication processing.
  • the base station communication process is a process of performing wireless communication with the terminal device 100.
  • the base station device 200 wirelessly connects with the terminal device 100, transmits data and control signals to the terminal device 100, and receives data from the terminal device 100.
  • the CPU 210 executes the base station side small data communication program 222 to build a control unit and perform base station side small data communication processing.
  • the base station side small data communication process is a process in which the base station apparatus 200 controls transmission and reception of small data between the terminal apparatus 100 in the RRC_INACTIVE state and the base station apparatus 200.
  • FIG. 5 is a diagram showing an example of the sequence of the first method.
  • the first method is a method in which uplink and downlink SDT is performed after waiting for the timing to transmit paging to the terminal device 100.
  • base station devices 200-1 (gNB1) and 200-2 (gNB2) belong to RNA1, which is the same RNA (RAN Notification Area). Furthermore, the terminal device 100 is in the RRC_INACTIVE state. In the subsequent figures as well, it is assumed that the RNAs to which the base station apparatuses 200-1 and 200-2 belong and the states of the terminal apparatus 100 are the same as in FIG.
  • Uplink data is generated in the terminal device 100 (UE) (S10). Then, the terminal device 100 performs celery selection before transmitting uplink data (S11).
  • downlink data is generated in the base station device 200-1 (S12).
  • the terminal device 100 is located in the cell of the base station device 200-2 through cell reselection.
  • the base station devices 200-1 and 200-2 transmit paging (RAN paging) in order to transmit downlink data to the terminal device 100 (S13, S14). Note that since RAN paging occurs for the entire RNA, paging is transmitted from both base station devices 200-1 and 200-2 belonging to the same RNA.
  • the terminal device 100 receives the paging from the base station device 200-2, and transmits an RRC Resume Request for downlink data transmission to the base station device 200-2 (S15).
  • the terminal device 100 receives the paging from the base station device 200-2, and transmits an RRC Resume Request including uplink data to the base station device 200-2 (S16).
  • the base station device 200-2 Upon receiving the RRC Resume Request for downlink data transmission, the base station device 200-2 transmits a data request (Data Request) to the base station device 200-1 before movement due to celery selection (S17).
  • Data Request data request
  • base station device 200-1 receives the data request
  • base station device 200-1 includes unsent downlink data in a data response (Data Forwarding) and transmits it to base station device 200-2 (S18).
  • the base station device 200-2 includes downlink data in the DL-CCCH and transmits it to the terminal device 100 (S19).
  • the terminal device 100 includes uplink data (or ACK) in the UL-CCCH and transmits it to the base station device 200-2.
  • the DL-CCCH is an example of a message (channel) for transmitting small data to the terminal device 100 in the RRC_INACTIVE state, for example.
  • the UL-CCCH is an example of a message (channel) for transmitting small data from the terminal device 100 in the RRC_INACTIVE state.
  • UL-CCCH is, for example, RRC Resume Request. In the following figures, the same applies to DL-CCCH and UL-CCCH unless otherwise specified.
  • FIG. 6 is a diagram illustrating an example of a sequence of downlink data transmission using the Cell Update method.
  • the Cell Update method is a method in which a procedure equivalent to Cell Update is performed on the terminal device 100 that is performing SDT or is about to perform SDT. Parameters (related information) of the Cell Update method are set, for example, in an RRC message when setting the SDT.
  • Downlink data 1 is generated in the base station device 200-1 (S21).
  • the base station device 200-1 includes the downlink data 1 in a channel for downlink small data transmission (for example, DL-CCCH, hereinafter the same), and transmits it to the terminal device 100 (S22).
  • DL-CCCH downlink small data transmission
  • the terminal device 100 receives the downlink data 1 (S22) and attempts to transmit ACK1 that confirms the reception of the downlink data 1 (S24). However, celery selection occurs (S23), and the terminal device 100 fails to transmit (or does not transmit) ACK1 (S25).
  • the base station device 200-1 fails to transmit the downlink data 2 that occurred after the celery selection (S26).
  • the terminal device 100 transmits Cell Update to the base station device 200-1 (S27).
  • the base station apparatus 200-1 Upon receiving the Cell Update, the base station apparatus 200-1 recognizes that the terminal apparatus 100 has performed cell reselection (identifies the terminal apparatus 100), and stops SDT for the terminal apparatus 100.
  • the base station device 200-1 receives the Cell Update, the base station device 200-1, for example, updates the terminal even if there is accumulated data (including ACK) for which transmission has not been completed (untransmitted or the transmitted ACK has not been received). Do not send to device 100.
  • the terminal device 100 transmits an RRC Resume Request to the base station device 200-2 in order to transmit ACK1 to the base station device 200-2 (S28).
  • the base station device 200-2 Upon receiving the RRC Resume Request, the base station device 200-2 transmits a data request to the base station device 200-1 before movement due to celery selection (S29).
  • base station device 200-1 receives the data request, base station device 200-1 includes downlink data 1 and 2 in a data response and transmits it to base station device 200-2 (S30). Note that since the base station device 200-1 has not received ACK1 for the downlink data 1, it recognizes that the downlink data 1 has also not been transmitted, so both the downlink data 1 and 2 are the data to be transmitted. becomes.
  • the base station device 200-2 includes downlink data 1 and 2 in the DL-CCCH and transmits it to the terminal device 100 (S31).
  • the terminal device 100 includes ACK1 and ACK2 indicating that downlink data 2 has been received in the UL-CCCH, and transmits it to the base station device 200-2 (S32).
  • the data request and data response may be omitted.
  • FIG. 7 is a diagram showing an example of a sequence of uplink data transmission using the Cell Update method.
  • the terminal device 100 includes uplink data 1 in the UL-CCCH and transmits it to the base station device 200-1 (S41). Then, the terminal device 100 performs celery selection (S42).
  • the base station device 200-1 receives uplink data 1 (S41) and attempts to transmit ACK1 indicating that uplink data 1 has been received to the terminal device 100, but the transmission fails because it has been celery selected (S41). S43).
  • the terminal device 100 transmits Cell Update to the base station device 200-1 (S44). As a result, communication between the terminal device 100 and the base station device 200-1 is temporarily interrupted.
  • the terminal device 100 transmits an RRC Resume Request to the base station device 200-2 in order to receive ACK1 from the base station device 200-2 (S45).
  • the base station device 200-2 Upon receiving the RRC Resume Request, the base station device 200-2 transmits a data request to the base station device 200-1 before movement due to celery selection (S46). When base station device 200-1 receives the data request, base station device 200-1 includes ACK1 in the data response and transmits it to base station device 200-2 (S47). Note that since the base station device 200-1 receives the Call Update after transmitting ACK1, it recognizes that the ACK1 has not reached the terminal device 100 (there is a possibility that it has not reached the terminal device 100). I can do it.
  • the base station device 200-2 includes ACK1 in the DL-CCCH and transmits it to the terminal device 100 (S48).
  • the terminal device 100 receives ACK1 (S48) and recognizes that the uplink data 1 has been successfully transmitted.
  • the terminal device 100 includes the uplink data 2 generated thereafter in the UL-CCCH and transmits it to the base station device 200-2 (S49).
  • the base station device 200-2 includes ACK2 indicating that uplink data 2 has been received in the DL-CCCH, and transmits it to the terminal device 100 (S50).
  • the Cell Update method can send and receive uplink and downlink small data without paging all the base station devices in the RNA as in the first method. .
  • Cell Update used in the Cell Update method will be explained.
  • FIG. 8 is a diagram illustrating an example of a transmission trigger for Cell Update.
  • Transmission trigger 1 is the timing when the SDT Failure Timer expires.
  • the terminal device 100 starts a timer when receiving the RRC Release (S60), and transmits a Cell Update when the timer expires (S70).
  • the terminal device 100 maintains the RRC_INACTIVE state (does not transition to the RRC_IDLE state) and continues to perform celery selection.
  • Transmission trigger 2 is the timing at which a transmission failure (reaching the number of retransmissions) in RLC (Radio Link Control) AM (Acknowledged Mode) is detected. Further, transmission trigger 2 is a transmission trigger that occurs when communication is executed in AM mode.
  • the terminal device 100 In the case of a downlink SDT, the terminal device 100 counts the number of corresponding ACK transmissions (S61), and transmits a Cell Update at the timing when it detects that the corresponding ACK has been transmitted a predetermined number of times (S70).
  • the terminal device 100 In the case of uplink SDT, the terminal device 100 counts the number of uplink data transmissions (S62), and transmits a Cell Update at the timing when it detects that the uplink data has been transmitted a predetermined number of times (S70). The terminal device 100 maintains the RRC_INACTIVE state (does not transition to the RRC_IDLE state) and continues to perform celery selection.
  • Transmission trigger 3 is a case where the Cell Reselection Criterion is satisfied.
  • the requirements in Cell Reselection Criterion comply with TS38.304/TS38.133, for example.
  • the terminal device 100 may perform cell reselection while the signal level of the serving cell is good so that Cell Update reaches the connected cell (serving cell: base station device 200 before cell reselection).
  • the base station device 200 introduces a new threshold and notifies the terminal device 100 with RRC Release, especially in order to shorten the time for camping on to a low priority (movement due to cell reselection). Note that when the terminal device 100 camps on High priority, it is not determined whether the signal level of the serving cell is low, so a new threshold does not need to be set.
  • FIG. 9 is a diagram illustrating an example of new cell selection criteria for celery selection.
  • FIG. 9 shows examples of various cell reselections (intra frequency reselection, inter frequency reselection, and inter RAT reselection). Underlined conditions are provided in (1) and (2) of camp-on to low priority (For lower frequency priority) of Inter frequency reselection in FIG. 9, respectively.
  • a radio quality threshold for SDT (Thresh SDT, LowQ ) and a reception level threshold for SDT (Thresh SDT, LowP ) are newly defined.
  • the radio quality threshold for SDT is a higher (better) value than the radio quality threshold in normal cell reselection.
  • the reception level threshold for SDT is a value higher than the radio quality threshold in normal celery selection.
  • the selection criteria for Inter RAT reselection are also set in the same way as the selection criteria for Inter frequency reselection.
  • FIG. 10 is a diagram showing an example of the timer value of the SDT Failure Timer.
  • the terminal device 100 may use the value of T319, for example.
  • the terminal device 100 may use, for example, a value set based on the value (range) of T319 as the timer value.
  • FIG. 11 is a diagram illustrating an example of the maximum number of RLC retransmissions.
  • the terminal device 100 may use the conventional value of the RLC maximum number of retransmissions. Further, when using the RLC maximum number of retransmissions as a transmission trigger for Cell Update, the terminal device 100 may use a value set based on the conventional value of the RLC maximum number of retransmissions as the RLC maximum number of retransmissions.
  • FIG. 12 is a diagram showing an example of ResumeCause.
  • "cell-Update” is added to ResumeCause.
  • the name may be other than “cell-Update”, such as "cna-Update (Cell-based Notification Area Update)" or "sdt-Access”.
  • ResumeCause can be sent as "RRC Resume Request” or "UE Assistant Information”.
  • RNA for SDT will be referred to as, for example, UE-specific RNA.
  • FIG. 13 is a diagram showing an example of an SDT sequence in UE-specific RNA.
  • base station device 200-1 and base station device 200-2 belong to the same RNA.
  • the base station apparatuses 200-1 and 200-2 have, for example, a configuration in which a plurality of DUs and RUs are connected to a CU, and have a plurality of cells.
  • Base station device 200-1 has Cell1 and Cell2, and base station device 200-2 has Cell3 and Cell4.
  • the UE-specific RNA is configured by, for example, multiple cells within the same base station device.
  • Cell1 and Cell2 constitute one UE-specific RNA.
  • the terminal device 100 is performing celery selection from Cell1 to Cell3.
  • the base station device 200-1 transmits paging for downlink data transmission (SDT implementation) to the terminal device 100 in the RRC_INACTIVE state in Cell1 and Cell2 of the same UE-specific RNA ( S80, S81).
  • paging other than paging for implementing SDT is transmitted in units of RNA
  • paging is transmitted in Cells 1 to 4.
  • paging for implementing SDT is transmitted in units of UE-specific RNA, so as shown in FIG. 13, paging is transmitted in Cells 1 and 2, and paging is transmitted in Cells 3 and 4. Not done.
  • the wireless communication system 10 can reduce paging transmission, and can suppress the amount of signal transmission for the entire system.
  • the terminal device 100 Since the terminal device 100 performs cell reselection to Cell 3 due to the occurrence of mobility, it transmits an RRC Resume Request to the base station device 200-2 (Cell 3) (S82). Upon receiving the RRC Resume Request, the base station device 200-2 transmits a data request to the base station device 200-1 before movement due to celery selection (S83). When base station device 200-1 receives the data request, base station device 200-1 includes the downlink data in a response and transmits it to base station device 200-2 (S84). The base station device 200-1 (Cell3) includes downlink data in the DL-CCCH and transmits it to the terminal device 100 (S85).
  • FIG. 14 is a diagram showing an example of an SDT sequence in UE-specific RNA.
  • downlink data is transmitted using DL-CCCH, and if ACK cannot be received, paging for implementing SDT is transmitted.
  • the base station device 200-1 When downlink data is generated, the base station device 200-1 includes the downlink data in the DL-CCCH and transmits it to the terminal device 100 in the RRC_INACTIVE state (S91). Then, if the base station device 200-1 cannot receive ACK for a predetermined period of time (cannot recognize data arrival confirmation) (S92), the base station device 200-1 performs downlink data transmission (SDT implementation) in Cell 1 and Cell 2 of the same UE-specific RNA. A paging message is sent (S93, S94).
  • processes S95 to S98 are similar to processes S82 to S85 in FIG. 13.
  • the terminal device 100 may transmit an ACK to the base station device 200-1. In this case, since paging for implementing SDT is not transmitted, the amount of signal transmission for the entire system can be suppressed.
  • FIG. 15 is a diagram showing an example of ResumeCause.
  • rna-UpdateDedicated underlined
  • the name may be other than "rna-UpdateDedicated", such as "sna-Update (SDT-based Notification Area Update)" or "sna-UpdatDedicated”. It's okay.
  • the names of messages, channels, etc. in each embodiment are not limited to the names of the embodiments.
  • the messages and channels are not particularly limited to those used in the embodiments, as long as they can be sent and received at the timing and conditions in each embodiment, and necessary information can be posted.
  • Wireless communication system 2 Opposite wireless communication device 3: Wireless communication device 10: Wireless communication system 100: Terminal device 110: CPU 120: Storage 121: Terminal communication program 122: Terminal side small data communication program 130: Memory 150: Wireless communication circuit 151: Antenna 200: Base station device 210: CPU 220: Storage 221: Base station communication program 222: Base station side small data communication program 230: Memory 250: Wireless communication circuit 251: Antenna

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
PCT/JP2022/023466 2022-06-10 2022-06-10 無線通信装置及び第２無線通信装置 Ceased WO2023238388A1 (ja)

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CN202280096571.2A CN119301997A (zh) 2022-06-10 2022-06-10 无线通信装置以及第二无线通信装置
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JP2020522158A (ja) * 2017-05-24 2020-07-27 クアルコム，インコーポレイテッド 非アクティブ状態におけるアップリンクスモールデータ送信
WO2020196124A1 (ja) * 2019-03-25 2020-10-01 京セラ株式会社 ハンドオーバ制御方法
WO2022030579A1 (ja) * 2020-08-06 2022-02-10 京セラ株式会社 通信制御方法

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WO2020196124A1 (ja) * 2019-03-25 2020-10-01 京セラ株式会社 ハンドオーバ制御方法
WO2022030579A1 (ja) * 2020-08-06 2022-02-10 京セラ株式会社 通信制御方法

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