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EP-4742728-A1 - CONTROL DEVICE, RELAY STATION, AND CONTROL METHOD

EP4742728A1EP 4742728 A1EP4742728 A1EP 4742728A1EP-4742728-A1

Abstract

To appropriately perform communication in a case where non-regenerative relay is used. A control apparatus according to an aspect of the present disclosure includes: a control unit that specifies a second terminal station with a concern of interference with non-regenerative relay between a base station and a first terminal station via a relay station; and a communication unit that notifies the relay station of a stop of the non-regenerative relay in a case where a first condition related to a reception signal-to-interference plus noise ratio (SINR) of a signal received by the second terminal station from the base station is satisfied at a timing at which the non-regenerative relay is performed.

Inventors

  • TAKIZAWA KENICHI

Assignees

  • TOYOTA JIDOSHA KABUSHIKI KAISHA

Dates

Publication Date
20260513
Application Date
20240808

Claims (16)

  1. A control apparatus comprising: a control unit that specifies a second terminal station with a concern of interference with non-regenerative relay between a base station and a first terminal station via a relay station; and a communication unit that notifies the relay station of a stop of the non-regenerative relay in a case where a first condition related to a reception signal-to-interference plus noise ratio (SINR) of a signal received by the second terminal station from the base station is satisfied at a timing at which the non-regenerative relay is performed.
  2. The control apparatus according to claim 1, wherein the control unit specifies the second terminal station based on an assumed worst value of the reception SINR at the timing at which the non-regenerative relay is performed.
  3. The control apparatus according to claim 2, wherein the control unit calculates the worst value of the reception SINR based on a maximum value of assumed interference noise power due to the non-regenerative relay in the second terminal station.
  4. The control apparatus according to claim 1, wherein the first condition is based on the assumed reception SINR at the timing at which the non-regenerative relay is performed, a desired SINR, and a first margin.
  5. The control apparatus according to claim 4, wherein the communication unit notifies the relay station of a restart of the non-regenerative relay in a case where the non-regenerative relay is stopped and a second condition related to the assumed reception SINR on an assumption that the non-regenerative relay is performed is satisfied.
  6. The control apparatus according to claim 5, wherein the second condition is based on the assumed reception SINR on the assumption that the non-regenerative relay is performed, a desired SINR, and a second margin.
  7. The control apparatus according to any one of claims 4 to 6, wherein the control unit calculates the reception SINR based on assumed interference noise power due to non-regenerative relay in the second terminal station.
  8. The control apparatus according to claim 1, wherein the first condition is based on the reception SINR calculated based on reception quality information reported by the second terminal station, a desired SINR, and a first margin.
  9. A relay station comprising: a communication unit that receives information regarding a second terminal station with a concern of interference with non-regenerative relay between a base station and a first terminal station via a relay station; and a control unit that determines to stop the non-regenerative relay in a case where a first condition related to a reception signal-to-interference plus noise ratio (SINR) of a signal received by the second terminal station from the base station is satisfied at a timing at which the non-regenerative relay is performed.
  10. The relay station according to claim 9, wherein the second terminal station is specified based on an assumed worst value of the reception SINR at the timing at which the non-regenerative relay is performed.
  11. The relay station according to claim 10, wherein the worst value of the reception SINR is calculated based on a maximum value of assumed interference noise power due to the non-regenerative relay in the second terminal station.
  12. The relay station according to claim 9, wherein the first condition is based on the assumed reception SINR at the timing at which the non-regenerative relay is performed, a desired SINR, and a first margin.
  13. The relay station according to claim 12, wherein the control unit determines to restart the non-regenerative relay in a case where the non-regenerative relay is stopped and a second condition related to the assumed reception SINR on an assumption that the non-regenerative relay is performed is satisfied.
  14. The relay station according to claim 13, wherein the second condition is based on the assumed reception SINR on the assumption that the non-regenerative relay is performed, a desired SINR, and a second margin.
  15. The relay station according to any one of claims 12 to 14, wherein the reception SINR is calculated based on assumed interference noise power due to non-regenerative relay in the second terminal station.
  16. A control method of a control apparatus comprising: specifying a second terminal station with a concern of interference with non-regenerative relay between a base station and a first terminal station via a relay station; and notifying the relay station of a stop of the non-regenerative relay in a case where a first condition related to a reception signal-to-interference plus noise ratio (SINR) of a signal received by the second terminal station from the base station is satisfied at a timing at which the non-regenerative relay is performed.

Description

Technical Field The present disclosure relates to a control apparatus, a relay station, and a control method in a mobile communication system. Background Art In regard to a New Radio (NR) technical specification in the 3rd Generation Partnership Project (3GPP (registered trademark)) which is a mobile communication system standardization project, non-regenerative relay has been introduced as a low-delay relay technology (for example, Non Patent Literature 1). In the non-regenerative relay, it is possible to perform relay with a low delay since demodulation and decoding are not performed in relay stations. Citation List Non Patent Literature Non Patent Literature 1: 3GPP TS 38.106 V18.1.0(2023-06) Summary of Invention Technical Problem However, in a case where non-regenerative relay is performed, there is a concern that terminal stations that do not use relay may be interfered with by the non-regenerative relay, which may lead to degradation of communication quality or a decrease in communication throughput. Therefore, one of objects of the present disclosure is to provide a control apparatus, a relay station, and a control method enabling appropriate communication in a case where non-regenerative relay is used. Solution to Problem A control apparatus according to an aspect of the present disclosure includes: a control unit that specifies a second terminal station with a concern of interference with non-regenerative relay between a base station and a first terminal station via a relay station; and a communication unit that notifies the relay station of a stop of the non-regenerative relay in a case where a first condition related to a reception signal-to-interference plus noise ratio (SINR) of a signal received by the second terminal station from the base station is satisfied at a timing at which the non-regenerative relay is performed. Advantageous Effects of Invention According to an aspect of the present disclosure, communication can be appropriately performed in a case where non-regenerative relay is used. Brief Description of Drawings Fig. 1 is a diagram illustrating an example of a schematic configuration of a system according to an embodiment of the present disclosure.Fig. 2 is a diagram illustrating an example of a schematic functional configuration of each apparatus according to an embodiment of the present disclosure.Fig. 3 is a diagram illustrating an example of a hardware configuration of each apparatus according to an embodiment of the present disclosure.Figs. 4A and 4B are diagrams illustrating an example of a variation of a hardware configuration of a base station according to an embodiment of the present disclosure.Figs. 5A to 5D are diagrams illustrating an example of a problem related to non-regenerative relay.Fig. 6 is a diagram illustrating an example of a first control flow according to an embodiment of the present disclosure.Fig. 7 is a diagram illustrating an example of parameters for calculating γRX,minUEi.Fig. 8 is a diagram illustrating an example of a value of DUEi.Fig. 9 is a diagram illustrating an example of parameters for calculating γRXUEi.Fig. 10 is a diagram illustrating an example of a second control flow according to an embodiment of the present disclosure.Fig. 11 is a diagram illustrating an example of a third control flow according to an embodiment of the present disclosure.Fig. 12 is a diagram illustrating an example of SS-SINR measurement report mapping.Fig. 13 is a diagram illustrating an example of parameters for calculating IR→UEi.Fig. 14 is a diagram illustrating an example of parameters for calculating γRXUEi,1.Fig. 15 is a diagram illustrating an example of parameters for calculating γRX,minUEi in a case where relay stations R1 and R2 are about to perform non-regenerative relay.Fig. 16 is a diagram illustrating an example of parameters for calculating γRXUEi in a case where the relay stations R1 and R2 perform non-regenerative relay. Description of Embodiments Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Note that in the present specification and the drawings, elements that can be similarly described will be denoted by the same reference numerals, and repeated description may thus be omitted. In the present disclosure, "A/B" and "at least one of A and B" may be interchangeably read. Furthermore, in the present disclosure, "A/B/C" may mean "at least one of A, B, and C". <Configuration of System> Fig. 1 is a diagram illustrating an example of a schematic configuration of a system according to an embodiment of the present disclosure. A system 1 includes a control apparatus 10, a base station 20, a relay station 30, and a terminal station 40. The system 1 may be referred to as a wireless communication system, an information communication system, or the like. For example, the system 1 is a system conforming to the 3GPP technical specifications (TS). More specifically, the system 1 is a system conforming