WO2021039587A1 - Système de radiocommunication - Google Patents

Système de radiocommunication Download PDF

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Publication number
WO2021039587A1
WO2021039587A1 PCT/JP2020/031461 JP2020031461W WO2021039587A1 WO 2021039587 A1 WO2021039587 A1 WO 2021039587A1 JP 2020031461 W JP2020031461 W JP 2020031461W WO 2021039587 A1 WO2021039587 A1 WO 2021039587A1
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WO
WIPO (PCT)
Prior art keywords
radio
wireless
communication system
wireless communication
station
Prior art date
Application number
PCT/JP2020/031461
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English (en)
Japanese (ja)
Inventor
慶 柳澤
達也 阿部
雅之 石▲ざき▼
清志 山本
Original Assignee
株式会社日立国際電気
Priority date (The priority date 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 date listed.)
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Application filed by 株式会社日立国際電気 filed Critical 株式会社日立国際電気
Priority to JP2021542813A priority Critical patent/JPWO2021039587A1/ja
Publication of WO2021039587A1 publication Critical patent/WO2021039587A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • 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
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user

Definitions

  • the present invention relates to a time-division relay type wireless communication system having a network topology in which a plurality of wireless stations are connected.
  • the time-divided relay type wireless communication system is a system that has a plurality of wireless stations such as a base station, a relay station, and a terminal station, and can perform data transmission by wireless relay using these wireless stations.
  • wireless communication systems are used, for example, for transmitting camera images taken at remote locations, and are being applied to fields such as medical care, disaster prevention, and disaster mitigation.
  • a control scheduler as shown in FIG. 5 is used.
  • the control scheduler shown in the figure is connected to a radio of a base station, which is a type of radio station, and includes a sensing result aggregation unit 201, an optimum topology calculation unit 202, and a radio frame allocation unit 203.
  • the sensing result (received power and radio quality measured for a radio station other than the one connected to the own station) by each radio station in the relay network is sent to the sensing result aggregation unit 201 of the control scheduler.
  • the optimum topology calculation unit 202 calculates the optimum network topology based on the sensing result.
  • the wireless frame allocation unit 203 allocates the requested number of frames to each wireless station in the relay network.
  • Patent Document 1 discloses an invention in which the allocation of wireless frames is devised in order to suppress the reduction of the communication area.
  • the conventional time-division relay method has a problem that the amount of data transmission decreases as the number of connected radio stations increases. This is because the control scheduler connected to the base station does not manage the frame in which the radio stations under the base station communicate in time, and each radio station connects directly underneath. This is because it is a distributed control that allocates radio frames in order to the radio stations. Therefore, even in a wireless section that is not affected by radio wave interference, wireless frames cannot be reused in time (that is, duplicate allocation of wireless frames), and as a result, data increases as the number of wireless stations connected increases. The amount of transmission was supposed to decrease.
  • the network topology generally represents a connection state when two or more wireless stations maintain a wireless connection, and may include a connection with a wired network.
  • BS represents a base station which is an example of a radio station
  • RS1 to RS6 represent a relay station which is another example of a radio station.
  • the solid line arrow between the radio stations indicates that the two radio stations are actually wirelessly connected
  • the broken line arrow between the radio stations indicates that the two radio stations can be wirelessly connected according to the sensing result. It represents that.
  • the frame allocation is as shown in FIG. That is, since the allocation is such that the wireless frames do not overlap in all the wireless sections, the data transmission amount decreases as the number of connected wireless stations increases, and the communication efficiency decreases.
  • the present invention has been made in view of the above-mentioned conventional circumstances, and provides a wireless communication system capable of suppressing a decrease in data transmission amount due to an increase in the number of connected wireless stations.
  • the purpose is to suppress a decrease in data transmission amount due to an increase in the number of connected wireless stations.
  • the wireless communication system is configured as follows. That is, in a time-division relay type wireless communication system having a network topology in which a plurality of wireless stations are connected, a wireless station other than the wireless station connected to the wireless station detected by each of the plurality of wireless stations Calculation unit that collects the sensing results of the above, a calculation unit that calculates the allocation mode of the radio frame for all the radio sections in the network topology based on the sensing result collected by the collection unit, and the calculation unit. It is characterized by including an allocation unit that allocates radio frames to all radio sections in the network topology according to the assigned allocation mode.
  • the calculation unit specifies a combination of radio sections that are not affected by radio wave interference based on the sensing result collected by the collection unit, and allows duplication of radio frames in the combination of the specified radio sections. It may be configured to calculate the assigned allocation mode.
  • the radio station senses a known signal transmitted from a radio station other than the radio station connected to its own station to measure received power or radio quality, and the measured value is sent to the collection unit as a sensing result. It may be configured to transmit.
  • the present invention it is possible to provide a wireless communication system capable of suppressing a decrease in data transmission amount due to an increase in the number of connected wireless stations.
  • FIG. 2 shows a configuration example of a control scheduler used in the wireless communication system according to the embodiment of the present invention.
  • the control scheduler of this example is connected to the radio of a base station, which is a kind of radio station, and has a sensing result aggregation unit 101, an optimum topology calculation unit 102, a radio frame allocation unit 103, and an optimum time frame allocation. It is provided with a calculation unit 104.
  • the sensing result aggregation unit 101 collects the sensing results of each radio station in the relay network.
  • each radio station senses a known signal (for example, preamble) transmitted from a radio station other than the radio station connected to its own station, and senses the received power and the measured value of the radio quality. Has been acquired as. Then, each radio station aggregates the sensing results in the sensing result aggregation unit 101 by transmitting the sensing results in response to a request from the sensing result aggregation unit 101 or spontaneously.
  • a known signal for example, preamble
  • the optimum topology calculation unit 102 calculates the optimum network topology based on the sensing results of each radio station aggregated in the sensing result aggregation unit 101. As a result, if the optimum network topology is different from the current network topology, the radio station that needs to change the connection destination of the radio link is instructed to switch the radio link so that the optimum network topology can be realized. And rebuild the network topology. Reconstruction of the network topology is performed when the optimum network topology changes due to the movement of radio stations or changes in the communication environment, when a new radio station enters the relay network, or when one of the radio stations enters the relay network. It is also performed when leaving the relay network.
  • the optimum time frame allocation calculation unit 104 calculates a radio frame allocation mode for each radio section in the network topology based on the sensing results by each radio station aggregated in the sensing result aggregation unit 101.
  • the radio frame allocation unit 103 notifies each radio station of the radio frames that can be used by the radio station according to the calculation result by the optimum time frame allocation calculation unit 104. That is, the radio frame allocation unit 103 centrally controls the allocation of radio frames for all the radio sections in the relay network.
  • the specific processing content of the optimum time frame allocation calculation unit 104 will be described using the network topology shown in FIG.
  • the network topology in the figure consists of one base station (BS) and six relay stations (RS1 to RS6), including BS and RS1, RS1 and RS2, RS2 and RS3, RS3 and RS4, and RS4.
  • RS5, and RS5 and RS5 are actually wirelessly connected. That is, a network topology (BS-RS1-RS2-RS3-RS4-RS5-RS6) having six radio sections connected in series in multiple stages is formed.
  • the optimum time frame allocation calculation unit 104 first considers these connection information (information on the radio section) and the sensing results by each radio station aggregated in the sensing result aggregation unit 101, as shown in FIG. Create a matrix.
  • the combinations in the wireless connection state are indicated by " ⁇ "
  • the wireless connection is possible according to the sensing result.
  • the found combinations are represented by " ⁇ ”
  • the combinations that could not be detected by sensing are represented by "x”.
  • the optimum time frame allocation calculation unit 104 analyzes the above matrix and calculates a combination in which the wireless frames can be reused in time (a combination in which the wireless frames can be allocated in duplicate).
  • a procedure for identifying a reusable radio frame in the radio section of RS4 and RS5 will be described. First, the combinations of radio stations that could not be detected by sensing in both RS4 and RS5 (radio stations with a common "x") are listed. That is, the radio sections that are not affected by radio wave interference are listed for both RS4 and RS5.
  • the radio stations that could not be detected by sensing in both RS4 and RS5 are BS, RS1 and RS2, three combinations of BS and RS1, BS and RS2, and RS1 and RS2 are listed.
  • the wireless stations that are actually connected wirelessly are picked up from these, two wireless sections of BS and RS1 and RS1 and RS2 are picked up. Therefore, it is determined that the optimum time frame allocation calculation unit 104 can reuse the radio frames assigned to the radio sections of BS and RS1 or RS1 and RS2 for the radio sections of RS4 and RS5. .. If the same calculation is performed for the radio sections of RS4 and RS5, it is determined that the radio frames assigned to the radio sections of BS and RS1, RS1 and RS2, or RS2 and RS3 can be reused.
  • FIG. 4 shows an example of radio frame allocation in consideration of the matrix of FIG.
  • the radio frames assigned to the radio sections of BS and RS1 are reused.
  • the radio frames assigned to the radio sections of BS and RS1 are reused.
  • a total of 3 frames of radio frames are reused, so that the total number of radio frames used in the entire section between BS and RS6 is reduced from 21 frames to 18 frames.
  • the amount of data transmitted from the terminal radio station will increase by about 18%.
  • the reuse mode of the radio frame shown in FIG. 4 is only an example, and of course, a radio frame of another radio section determined to be reusable in time may be assigned.
  • the sensing result aggregation unit 101 of the control scheduler is a wireless station connected to the wireless station detected by each of the plurality of wireless stations in the network topology.
  • the optimum time frame allocation calculation unit 104 of the control scheduler collects the sensing results for radio stations other than the above, and based on the sensing results collected by the sensing result aggregation unit 101, the radio for all the radio sections in the network topology.
  • the frame allocation mode is calculated, and the radio frame allocation unit 103 of the control scheduler allocates radio frames to all the radio sections in the network topology according to the allocation mode calculated by the optimum time frame allocation calculation unit 104. It is configured as follows.
  • control scheduler centrally controls the allocation of radio frames to all the radio sections in the network topology based on the sensing results detected by each of the plurality of radio stations in the network topology. doing. Therefore, even if the number of connected wireless stations increases, the wireless frames can be allocated without waste in consideration of the sensing result of each wireless device, so that it is possible to suppress a decrease in the amount of data transmission.
  • the optimum time frame allocation calculation unit 104 identifies a combination of radio sections that are not affected by radio wave interference based on the sensing results collected by the sensing result aggregation unit 101, and the specified radio section It is configured to calculate an allocation mode that allows duplication of radio frames in combination. As a result, it is possible to optimize the allocation of wireless frames within the range not affected by radio wave interference, and it is possible to realize efficient data transmission.
  • the term "radio section that is not affected by radio wave interference” is not limited to a radio section that is not affected by radio wave interference at all, and is not limited to a radio section that is not affected by radio wave interference, that is, radio wave interference. It also includes radio sections that are present but do not interfere with wireless communication.
  • each radio station senses a known signal (for example, a preamble) transmitted from a radio station other than the radio station connected to its own station to measure received power or radio quality, and measures the received power or radio quality.
  • the measurement value is transmitted to the collecting unit as a sensing result. In this way, since the sensing is performed by using the function provided by the conventional radio station, it is not necessary to add the function for sensing to each radio.
  • the sensing result aggregation unit 101 realizes the function of the collection unit according to the present invention
  • the optimum time frame allocation calculation unit 104 realizes the function of the calculation unit according to the present invention
  • the wireless frame allocation unit 103 has realized the function of the allocation unit according to the present invention, but each function according to the present invention may be realized by another configuration. Further, in this example, each function according to the present invention is realized by a single device (control scheduler), but it may be realized by a plurality of devices connected so as to be able to communicate with each other.
  • the present invention has been described in detail above, it goes without saying that the present invention is not limited to the above-described configuration and may be realized by a configuration other than the above. Further, the present invention provides, for example, a method or method for executing the process according to the present invention, a program for realizing such a method or method by a computer having hardware resources such as a processor or memory, and such a program. It is also possible to provide it as a storage medium for storing.
  • the present invention can be used in a time-division relay type wireless communication system having a network topology in which a plurality of wireless stations are connected.
  • BS Base station
  • RS1 to RS6 Relay station 101,201: Sensing result aggregation unit, 102,202: Optimal topology calculation unit, 103,203: Wireless frame allocation unit, 104: Optimal time frame allocation calculation unit

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un système de communication sans fil capable de supprimer une réduction d'une quantité de transfert de données provoquée par une augmentation du nombre de stations sans fil connectées. Une unité d'agrégation de résultats de détection 101 collecte des résultats de détection qui sont détectés par chaque station d'une pluralité de stations sans fil dans une topologie de réseau concernant une station sans fil autre que des stations sans fil connectées à la pluralité de stations sans fil. Une unité de calcul d'attribution de trame temporelle appropriée 104 calcule, sur la base des résultats de détection collectés par l'unité d'agrégation de résultat de détection 101, un mode d'attribution de trames sans fil par rapport à toutes les sections sans fil dans la topologie de réseau. Une unité d'attribution de trame sans fil 103 attribue, conformément au mode d'attribution calculé par l'unité de calcul d'attribution de trame temporelle appropriée 104, les trames sans fil par rapport à toutes les sections sans fil dans la topologie de réseau.
PCT/JP2020/031461 2019-08-30 2020-08-20 Système de radiocommunication WO2021039587A1 (fr)

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JP2019-158741 2019-08-30

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008118661A (ja) * 2006-11-06 2008-05-22 Fujitsu Ltd 干渉レベルに基づいてリユースパターンを発生させる方法、装置及びシステム
JP2008199579A (ja) * 2006-11-03 2008-08-28 Fujitsu Ltd マルチホップモバイルリレーシステムにおける帯域幅再使用
WO2010113382A1 (fr) * 2009-03-31 2010-10-07 パナソニック株式会社 Appareil de relais et procédé de relais
JP2015220671A (ja) * 2014-05-20 2015-12-07 富士通株式会社 通信方法、通信システム及び通信装置
JP2019115014A (ja) * 2017-12-26 2019-07-11 株式会社日立国際電気 無線通信システムおよび無線通信方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008199579A (ja) * 2006-11-03 2008-08-28 Fujitsu Ltd マルチホップモバイルリレーシステムにおける帯域幅再使用
JP2008118661A (ja) * 2006-11-06 2008-05-22 Fujitsu Ltd 干渉レベルに基づいてリユースパターンを発生させる方法、装置及びシステム
WO2010113382A1 (fr) * 2009-03-31 2010-10-07 パナソニック株式会社 Appareil de relais et procédé de relais
JP2015220671A (ja) * 2014-05-20 2015-12-07 富士通株式会社 通信方法、通信システム及び通信装置
JP2019115014A (ja) * 2017-12-26 2019-07-11 株式会社日立国際電気 無線通信システムおよび無線通信方法

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