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EP-4742804-A1 - CONTROL DEVICE, RELAY STATION, AND CONTROL METHOD

EP4742804A1EP 4742804 A1EP4742804 A1EP 4742804A1EP-4742804-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 selects a first frequency resource and a second frequency resource from frequency resource candidates to minimize interference with communication using a third frequency resource between a base station and a second terminal station in a case where uplink non-regenerative relay communication from a relay station to the base station is performed on the first frequency resource and downlink non-regenerative relay communication from the relay station to a first terminal station is performed on the second frequency resource; and a communication unit that transmits information related to the selected first frequency resource to the relay station and transmits information related to the selected second frequency resource to the first terminal station.

Inventors

  • TAKIZAWA KENICHI

Assignees

  • TOYOTA JIDOSHA KABUSHIKI KAISHA

Dates

Publication Date
20260513
Application Date
20240808

Claims (9)

  1. A control apparatus comprising: a control unit that selects a first frequency resource and a second frequency resource from frequency resource candidates to minimize interference with communication using a third frequency resource between a base station and a second terminal station in a case where uplink non-regenerative relay communication from a relay station to the base station is performed on the first frequency resource and downlink non-regenerative relay communication from the relay station to a first terminal station is performed on the second frequency resource; and a communication unit that transmits information related to the selected first frequency resource to the relay station and transmits information related to the selected second frequency resource to the first terminal station.
  2. The control apparatus according to claim 1, wherein the control unit calculates the interference based on reception power of the base station in the uplink non-regenerative relay communication on the first frequency resource, an interference level based on a difference between the third frequency resource and the first frequency resource, reception power of the first terminal station in the downlink non-regenerative relay communication on the second frequency resource, and an interference level based on a difference between the third frequency resource and the second frequency resource.
  3. The control apparatus according to claim 1 or 2, wherein the control unit minimizes the interference based on a restriction that a first condition related to a reception signal-to-interference plus noise power ratio (SINR) of the uplink non-regenerative relay communication is satisfied.
  4. The control apparatus according to claim 1 or 2, wherein the control unit minimizes the interference based on a restriction that a second condition related to a reception signal-to-interference plus noise power ratio (SINR) of the downlink non-regenerative relay communication is satisfied.
  5. A relay station comprising: a control unit that selects a first frequency resource and a second frequency resource from frequency resource candidates to minimize interference with communication using a third frequency resource between a base station and a second terminal station in a case where uplink non-regenerative relay communication from a relay station to the base station is performed on the first frequency resource and downlink non-regenerative relay communication from the relay station to a first terminal station is performed on the second frequency resource; and a communication unit that transmits information related to the selected first frequency resource to the base station and transmits information related to the selected second frequency resource to the first terminal station.
  6. The relay station according to claim 5, wherein the control unit calculates the interference based on reception power of the base station in the uplink non-regenerative relay communication on the first frequency resource, an interference level based on a difference between the third frequency resource and the first frequency resource, reception power of the first terminal station in the downlink non-regenerative relay communication on the second frequency resource, and an interference level based on a difference between the third frequency resource and the second frequency resource.
  7. The relay station according to claim 5 or 6, wherein the control unit minimizes the interference based on a restriction that a first condition related to a reception signal-to-interference plus noise power ratio (SINR) of the uplink non-regenerative relay communication is satisfied.
  8. The relay station according to claim 5 or 6, wherein the control unit minimizes the interference based on a restriction that a second condition related to a reception signal-to-interference plus noise power ratio (SINR) of the downlink non-regenerative relay communication is satisfied.
  9. A control method of a control apparatus comprising: selecting a first frequency resource and a second frequency resource from frequency resource candidates to minimize interference with communication using a third frequency resource between a base station and a second terminal station in a case where uplink non-regenerative relay communication from a relay station to the base station is performed on the first frequency resource and downlink non-regenerative relay communication from the relay station to a first terminal station is performed on the second frequency resource; and transmitting information related to the selected first frequency resource to the relay station and transmitting information related to the selected second frequency resource to the first terminal station.

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 selects a first frequency resource and a second frequency resource from frequency resource candidates to minimize interference with communication using a third frequency resource between a base station and a second terminal station in a case where uplink non-regenerative relay communication from a relay station to the base station is performed on the first frequency resource and downlink non-regenerative relay communication from the relay station to a first terminal station is performed on the second frequency resource; and a communication unit that transmits information related to the selected first frequency resource to the relay station and transmits information related to the selected second frequency resource to the first terminal station. 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.Figs. 6A and 6B are diagrams illustrating an example of a case where interference related to the non-regenerative relay becomes problematic and a case where the interference does not become problematic.Fig. 7 is a diagram illustrating an example of a first control sequence of relay frequency selection according to an embodiment of the present disclosure.Fig. 8 is a diagram illustrating an example of a value of DR(Δf).Fig. 9 is a diagram illustrating an example of a second control sequence according to an embodiment of the present disclosure. 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, a control 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 to the TS of 5th generation mobile communication system (5G) or New Radio (NR), for example. Note that the system 1 is not limited to this example and may include systems using Long Term Evolution (LTE), LTE-Advanced (LTE-A), 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G)