WO2024009481A1 - 無線通信システム、中継局、及び中継方法 - Google Patents
無線通信システム、中継局、及び中継方法 Download PDFInfo
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- WO2024009481A1 WO2024009481A1 PCT/JP2022/027030 JP2022027030W WO2024009481A1 WO 2024009481 A1 WO2024009481 A1 WO 2024009481A1 JP 2022027030 W JP2022027030 W JP 2022027030W WO 2024009481 A1 WO2024009481 A1 WO 2024009481A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/28—Cell structures using beam steering
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
Definitions
- the present invention relates to a wireless communication system, a relay station, and a relay method.
- Non-Patent Document 1 discloses a technology in which a wireless device with a relay function is mounted on a moving body (forklift, etc.) that tours or moves around a factory, etc., and performs ON-OFF control as necessary. .
- Relay stations in wireless communication networks relay and retransmit signals that do not require relaying, so there is a problem that radio wave interference may occur.
- the disclosed technology aims to reduce radio wave interference caused by signals transmitted by relay stations in a wireless communication network.
- the disclosed technology is a wireless communication system that includes a base station that transmits and receives signals to and from terminals, and a relay station that relays signals between the base station and the terminals, and the base station has a plurality of terminals 20.
- a scheduling function unit that determines a schedule for transmitting and receiving signals to and from the base station, and transmits schedule information indicating the determined schedule to the relay station, and the relay station transmits the schedule information from the base station to the base station.
- a schedule information acquisition unit that identifies a destination terminal based on the schedule information, and selects a beam to be used for relay for each terminal specified as a destination based on a beam number predefined for each terminal.
- a wireless communication system includes a beam control unit that controls the beam.
- Radio wave interference caused by signals transmitted by relay stations in a wireless communication network can be reduced.
- 1 is a diagram showing an example of a configuration of a wireless communication system according to an embodiment of the present invention.
- 1 is a diagram illustrating an example of a functional configuration of a base station and a relay station included in a wireless communication system according to an embodiment of the present invention.
- 3 is a flowchart illustrating an example of the flow of relay processing according to an embodiment of the present invention.
- 1 is a diagram showing an example of a hardware configuration of a computer.
- FIG. 1 is a diagram showing an example of the configuration of a wireless communication system according to an embodiment of the present invention.
- the wireless communication system 1 includes a relay station 10, a terminal 20, a base station 30, and a core network 40.
- the base station 30 and the core network 40 are communicably connected to each other using a wired or wireless communication method.
- the relay station 10 is a device that relays signals in communication between the base station 30 and the plurality of terminals 20.
- the relay station 10 receives information indicating a schedule for signal transmission and reception (hereinafter referred to as schedule information) from the base station 30, selects a beam for each terminal 20 based on the schedule information, and uses the selected beam. Relay signals.
- the base station 30 receives information necessary for control from the core network 40 and transmits and receives signals to and from the terminal 20 via the relay station 10. Base station 30 transmits schedule information to relay station 10 (or terminal 20).
- the terminal 20 is, for example, a mobile station, and transmits and receives signals to and from the base station 30 via the relay station 10.
- FIG. 2 is a diagram showing an example of the functional configuration of a base station and a relay station included in the wireless communication system according to the embodiment of the present invention.
- the base station 30 includes a scheduling function section 31.
- the scheduling function unit 31 determines a schedule for transmitting and receiving signals with a plurality of terminals 20, and transmits schedule information indicating the determined schedule to the relay station 10.
- the schedule information may include, for example, a terminal ID for identifying each terminal, allocated transmission resources (frequency and time slot (resource block)), and the like.
- the relay station 10 includes a schedule information acquisition section 11, a relay function control section 12, and a beam control section 13.
- the schedule information acquisition unit 11 receives schedule information from the base station 30 via wireless communication.
- the schedule information may be included in a PDCCH (Physical Downlink Control Channel) transmitted to the terminal 20 or the relay station 10. That is, the schedule information acquisition unit 11 may receive the PDCCH and acquire the schedule information by decoding the received PDCCH.
- PDCCH Physical Downlink Control Channel
- the relay function control unit 12 controls a relay function for relaying signals between the base station 30 and the terminal 20. For example, based on the schedule information, the relay function control unit 12 controls the time resources and/or frequency resources of the signals that the relay station 10 itself relays and that is transmitted to or received from the terminal 20.
- the relay function may be turned on (enabled) only when either or both of the specified time resources and frequency resources are used.
- the beam control unit 13 controls the beams used when transmitting signals to each terminal 20. Specifically, the beam control unit 13 identifies the destination terminal 20 based on the schedule information, and performs the transmission for each terminal 20 specified as the destination based on the beam number predefined for each terminal 20. You may decide which beam to use.
- the relay station 10 needs to be synchronized with the base station 30 and the terminal 20 in advance in order to control the relay operation according to the scheduling by the base station 30.
- the relay station 10 uses a synchronization signal (PSS (Primary Synchronization Signal)/SSS (Secondary Synchronization Signal)) received from the base station 30 (as in the initial access procedure of 5G NewRadio). )).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- the relay station 10 or the terminal 20 synchronizes with each other using a synchronization signal received from the base station 30, or the relay station 10 periodically transmits a synchronization signal, and the terminal 20 updates its clock accordingly. By doing so, synchronization between the relay station 10 and the terminal 20 may be realized.
- FIG. 3 is a flowchart illustrating an example of the flow of relay processing according to the embodiment of the present invention.
- the relay station 10 determines the beam number to be used for each terminal 20 (step S101). For example, the relay station 10 transmits beamformed SS/PBCH (Synchronization Signal and Physical Broadcast Channel) blocks multiple times using different beams.
- SS/PBCH Synchronization Signal and Physical Broadcast Channel
- the SS/PBCH is a downlink signal broadcast at the time of initial connection.
- the SS/PBCH block is a signal block in which a synchronization signal and broadcast information are set. If there are multiple beamforming patterns, the relay station 10 transmits the SS/PBCH block using different beams. Note that the plurality of beams being the same may mean that the plurality of beams are in a QCL (Quasi Co Location) relationship with each other.
- the terminal 20 transmits a PRACH (Physical Random Access Channel) to the relay station 10 using resources corresponding to a high-quality beam from the received SS/PBCH block.
- PRACH Physical Random Access Channel
- the PRACH is an uplink signal transmitted by a random access procedure using resources designated for an SS/PBCH block with good reception quality.
- Relay station 10 receives PRACH from terminal 20 and determines a beam number to be used for each terminal 20 based on the received PRACH.
- the relay station 10 may execute the process of step S101 again at regular intervals or when synchronization with the terminal 20 is lost.
- the schedule information acquisition unit 11 acquires schedule information from the base station 30 (step S102). Specifically, the schedule information acquisition unit 11 extracts schedule information from the PDCCH transmitted from the base station 30. Note that, as long as the relay station 10 decodes the PDCCH transmitted from the base station 30, the relay station 10 may relay the signal using a regenerative relay method or a non-regenerative relay method.
- the relay function control unit 12 controls ON/OFF of the relay function based on the schedule information (step S103). For example, based on the schedule information, the relay function control unit 12 controls the time resources and/or frequency resources of the signals that the relay station 10 itself relays and that is transmitted to or received from the terminal 20. The relay function is turned ON (enabled) only when either or both of the specified time resources and frequency resources are used. Thereby, the relay station 10 can relay only to the terminal 20 connected to itself (that has transmitted the PRACH).
- the beam control unit 13 relays the signal transmitted from the base station 30 for the terminal 20 to the terminal 20 using the beam corresponding to the beam number determined for each terminal 20 (step S104). Specifically, the beam control unit 13 identifies the destination terminal 20 based on the schedule information, and performs the transmission for each terminal 20 specified as the destination based on the beam number predefined for each terminal 20. Decide which beam to use.
- relay station 10 According to the relay station 10 according to the present embodiment, signals can be relayed only when relaying is necessary. As a result, interference with other devices, terminals, etc. can be suppressed, unnecessary beam emission can be suppressed, and power consumption can be reduced. Further, relay station 10 can transmit a signal to terminal 20 using a beam formed by beamforming. As a result, interference with other devices, terminals, etc. can be suppressed, and radio wave quality for transmission and reception with the desired terminal 20 can be improved. This makes it possible to reduce radio wave interference caused by signals transmitted by relay stations in a wireless communication network.
- Relay station 10, terminal 20, or base station 30 according to this embodiment is realized by, for example, the hardware configuration of computer 500 shown in FIG. 4.
- the computer 500 shown in FIG. 4 includes an input device 501, a display device 502, an external I/F 503, a communication I/F 504, a processor 505, and a memory device 506. Each of these pieces of hardware is communicably connected via a bus 507.
- the input device 501 is, for example, a keyboard, a mouse, a touch panel, or the like.
- the display device 502 is, for example, a display. Note that the computer 500 does not need to have at least one of the input device 501 and the display device 502.
- the external I/F 503 is an interface with an external device such as a recording medium 503a.
- a recording medium 503a examples include a CD (Compact Disc), a DVD (Digital Versatile Disk), an SD memory card (Secure Digital memory card), and a USB (Universal Serial Bus) memory card.
- the communication I/F 504 is an interface for performing data communication with other devices, equipment, systems, etc.
- the processor 505 is, for example, various arithmetic devices such as a CPU.
- the memory device 506 is, for example, various storage devices such as an HDD, an SSD, a RAM (Random Access Memory), a ROM (Read Only Memory), and a flash memory.
- the relay station 10, terminal 20, or base station 30 can implement the various processes described above by having the hardware configuration of the computer 500 shown in FIG.
- the hardware configuration of the computer 500 shown in FIG. 4 is an example, and the computer 500 may have another hardware configuration.
- computer 500 may have multiple processors 505 and multiple memory devices 506.
- the relay station 10, terminal 20, or base station 30 is realized by reading a program for causing the computer 500 to execute each of the above-described processes, and executing the process specified in the program.
- the program may be recorded on the recording medium 503a or the like, or may be provided through a network.
- a wireless communication system comprising a base station that transmits and receives signals to and from a terminal, and a relay station that relays signals between the base station and the terminal,
- the base station is comprising a scheduling function unit that determines a schedule for transmitting and receiving signals to and from a plurality of terminals 20 and transmits schedule information indicating the determined schedule to the relay station
- the relay station is a schedule information acquisition unit that acquires the schedule information from the base station; a beam control unit that identifies a destination terminal based on the schedule information and controls a beam to be used for relay for each terminal specified as a destination based on a beam number predefined for each terminal; prepare, Wireless communication system.
- the relay station is further comprising a relay function control unit that controls whether to enable a function of relaying signals between the base station and the terminal based on the schedule information;
- the wireless communication system according to item 1.
- the relay function control unit Based on the schedule information, the relay function control unit identifies either or both of a time resource and a frequency resource of a signal to be relayed by itself and is transmitted to or received from the terminal, and enabling a function of relaying signals between the base station and the terminal when using either or both of the time resource and the frequency resource;
- the wireless communication system according to item 2.
- a relay station that relays signals between a base station and a terminal, a schedule information acquisition unit that acquires schedule information from the base station; a beam control unit that identifies a destination terminal based on the schedule information and controls a beam to be used for relay for each terminal specified as a destination based on a beam number predefined for each terminal; prepare, Relay station.
- Wireless communication system 10 Relay station 11 Schedule information acquisition unit 12 Relay function control unit 13 Beam control unit 20 Terminal 30 Base station 31 Scheduling function unit 40 Core network 500 Computer 501 Input device 502 Display device 503 External I/F 503a Recording medium 504 Communication I/F 505 processor 506 memory device 507 bus
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Abstract
Description
本実施の形態では、中継局が事前に端末ごとに取得したビーム番号に基づいて、端末毎に制御されたビームを使用して信号を中継する例について説明する。
図1は、本発明の実施の形態に係る無線通信システムの構成の一例を示す図である。無線通信システム1は、中継局10と端末20と基地局30とコアネットワーク40とを備える。基地局30とコアネットワーク40とは、有線または無線の通信方式により、互いに通信可能に接続されている。
図2は、本発明の実施の形態に係る無線通信システムが備える基地局および中継局の機能構成の一例を示す図である。基地局30は、スケジューリング機能部31を備える。
次に、中継局10の動作について図面を参照して説明する。中継局10は、基地局30によるスケジューリングに合わせて中継動作を制御するため、予め基地局30および端末20と同期しておく必要がある。中継局10と基地局30との同期では、例えば中継局10は、(5G NewRadioの初期アクセス手順と同じく、)基地局30から受信する同期信号(PSS(Primary Synchronization Signal)/SSS(Secondary Synchronization Signal))に合わせてもよい。中継局10は、基地局30より定期的に送信される同期信号を受信の都度、クロックを更新してもよい。また、中継局10または端末20が、それぞれ基地局30から受信する同期信号によって互いに同期するか、または中継局10が定期的に同期信号を送信し、端末20がこれに合わせてクロックを更新することによって、中継局10と端末20との間の同期を実現してもよい。
最後に、本実施形態に係る中継局10、端末20または基地局30のハードウェア構成について説明する。本実施形態に係る中継局10、端末20または基地局30は、例えば、図4に示すコンピュータ500のハードウェア構成により実現される。
本明細書には、少なくとも下記の各項に記載した無線通信システム、中継局、及び中継方法が記載されている。
(第1項)
端末と信号を送受信する基地局と、前記基地局と前記端末との間で信号を中継する中継局とを備える無線通信システムであって、
前記基地局は、
複数の端末20との間の信号の送受信の送受信のスケジュールを決定し、決定された前記スケジュールを示すスケジュール情報を前記中継局に送信するスケジューリング機能部を備え、
前記中継局は、
前記スケジュール情報を前記基地局から取得するスケジュール情報取得部と、
前記スケジュール情報に基づいて送信先の端末を特定し、端末ごとにあらかじめ規定されたビーム番号に基づいて、送信先として特定された端末ごとに中継に使用するビームを制御するビーム制御部と、を備える、
無線通信システム。
(第2項)
前記中継局は、
前記スケジュール情報に基づいて、前記基地局と前記端末との間で信号を中継する機能を有効にするか否かを制御する中継機能制御部をさらに備える、
第1項に記載の無線通信システム。
(第3項)
前記中継機能制御部は、前記スケジュール情報に基づいて、自ら中継する信号であって、前記端末との間で送信または受信する信号の時間リソースおよび周波数リソースのいずれかまたは両方を特定し、特定された前記時間リソースおよび前記周波数リソースのいずれかまたは両方を使用する場合に前記基地局と前記端末との間で信号を中継する機能を有効にする、
第2項に記載の無線通信システム。
(第4項)
基地局と端末との間で信号を中継する中継局であって、
スケジュール情報を前記基地局から取得するスケジュール情報取得部と、
前記スケジュール情報に基づいて送信先の端末を特定し、端末ごとにあらかじめ規定されたビーム番号に基づいて、送信先として特定された端末ごとに中継に使用するビームを制御するビーム制御部と、を備える、
中継局。
(第5項)
基地局と端末との間で信号を中継する中継局が実行する中継方法であって、
スケジュール情報を前記基地局から取得するステップと、
前記スケジュール情報に基づいて送信先の端末を特定し、端末ごとにあらかじめ規定されたビーム番号に基づいて、送信先として特定された端末ごとに中継に使用するビームを制御するステップと、を備える、
中継方法。
10 中継局
11 スケジュール情報取得部
12 中継機能制御部
13 ビーム制御部
20 端末
30 基地局
31 スケジューリング機能部
40 コアネットワーク
500 コンピュータ
501 入力装置
502 表示装置
503 外部I/F
503a 記録媒体
504 通信I/F
505 プロセッサ
506 メモリ装置
507 バス
Claims (5)
- 端末と信号を送受信する基地局と、前記基地局と前記端末との間で信号を中継する中継局とを備える無線通信システムであって、
前記基地局は、
複数の端末20との間の信号の送受信の送受信のスケジュールを決定し、決定された前記スケジュールを示すスケジュール情報を前記中継局に送信するスケジューリング機能部を備え、
前記中継局は、
前記スケジュール情報を前記基地局から取得するスケジュール情報取得部と、
前記スケジュール情報に基づいて送信先の端末を特定し、端末ごとにあらかじめ規定されたビーム番号に基づいて、送信先として特定された端末ごとに中継に使用するビームを制御するビーム制御部と、を備える、
無線通信システム。 - 前記中継局は、
前記スケジュール情報に基づいて、前記基地局と前記端末との間で信号を中継する機能を有効にするか否かを制御する中継機能制御部をさらに備える、
請求項1に記載の無線通信システム。 - 前記中継機能制御部は、前記スケジュール情報に基づいて、自ら中継する信号であって、前記端末との間で送信または受信する信号の時間リソースおよび周波数リソースのいずれかまたは両方を特定し、特定された前記時間リソースおよび前記周波数リソースのいずれかまたは両方を使用する場合に前記基地局と前記端末との間で信号を中継する機能を有効にする、
請求項2に記載の無線通信システム。 - 基地局と端末との間で信号を中継する中継局であって、
スケジュール情報を前記基地局から取得するスケジュール情報取得部と、
前記スケジュール情報に基づいて送信先の端末を特定し、端末ごとにあらかじめ規定されたビーム番号に基づいて、送信先として特定された端末ごとに中継に使用するビームを制御するビーム制御部と、を備える、
中継局。 - 基地局と端末との間で信号を中継する中継局が実行する中継方法であって、
スケジュール情報を前記基地局から取得するステップと、
前記スケジュール情報に基づいて送信先の端末を特定し、端末ごとにあらかじめ規定されたビーム番号に基づいて、送信先として特定された端末ごとに中継に使用するビームを制御するステップと、を備える、
中継方法。
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18/881,278 US20260107154A1 (en) | 2022-07-07 | 2022-07-07 | Radio communication system, relay station, and relay method |
| JP2024531867A JP7761151B2 (ja) | 2022-07-07 | 2022-07-07 | 無線通信システム、中継局、及び中継方法 |
| PCT/JP2022/027030 WO2024009481A1 (ja) | 2022-07-07 | 2022-07-07 | 無線通信システム、中継局、及び中継方法 |
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| PCT/JP2022/027030 WO2024009481A1 (ja) | 2022-07-07 | 2022-07-07 | 無線通信システム、中継局、及び中継方法 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011091784A (ja) * | 2009-09-25 | 2011-05-06 | Sony Corp | 通信システム、中継装置、管理サーバ、および通信端末 |
| JP2012138951A (ja) * | 2006-12-07 | 2012-07-19 | Mitsubishi Electric Corp | 無線端末局、無線基地局および無線通信システム |
| JP2020077974A (ja) * | 2018-11-07 | 2020-05-21 | 日本電信電話株式会社 | 中継装置、中継方法及び中継プログラム |
| JP2022096459A (ja) * | 2020-12-17 | 2022-06-29 | 電気興業株式会社 | 無線中継装置、無線中継方法、および、無線中継装置用プログラム |
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2022
- 2022-07-07 WO PCT/JP2022/027030 patent/WO2024009481A1/ja not_active Ceased
- 2022-07-07 US US18/881,278 patent/US20260107154A1/en active Pending
- 2022-07-07 JP JP2024531867A patent/JP7761151B2/ja active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012138951A (ja) * | 2006-12-07 | 2012-07-19 | Mitsubishi Electric Corp | 無線端末局、無線基地局および無線通信システム |
| JP2011091784A (ja) * | 2009-09-25 | 2011-05-06 | Sony Corp | 通信システム、中継装置、管理サーバ、および通信端末 |
| JP2020077974A (ja) * | 2018-11-07 | 2020-05-21 | 日本電信電話株式会社 | 中継装置、中継方法及び中継プログラム |
| JP2022096459A (ja) * | 2020-12-17 | 2022-06-29 | 電気興業株式会社 | 無線中継装置、無線中継方法、および、無線中継装置用プログラム |
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| Publication number | Publication date |
|---|---|
| US20260107154A1 (en) | 2026-04-16 |
| JP7761151B2 (ja) | 2025-10-28 |
| JPWO2024009481A1 (ja) | 2024-01-11 |
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