WO2023203689A1 - Système de communication sans fil, procédé de commande de communication sans fil et station de base - Google Patents

Système de communication sans fil, procédé de commande de communication sans fil et station de base Download PDF

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Publication number
WO2023203689A1
WO2023203689A1 PCT/JP2022/018310 JP2022018310W WO2023203689A1 WO 2023203689 A1 WO2023203689 A1 WO 2023203689A1 JP 2022018310 W JP2022018310 W JP 2022018310W WO 2023203689 A1 WO2023203689 A1 WO 2023203689A1
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WIPO (PCT)
Prior art keywords
wireless
module
base station
relay device
modules
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PCT/JP2022/018310
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English (en)
Japanese (ja)
Inventor
純一 岩谷
笑子 篠原
裕介 淺井
泰司 鷹取
知之 山田
芳孝 清水
Original Assignee
日本電信電話株式会社
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Application filed by 日本電信電話株式会社 filed Critical 日本電信電話株式会社
Priority to PCT/JP2022/018310 priority Critical patent/WO2023203689A1/fr
Publication of WO2023203689A1 publication Critical patent/WO2023203689A1/fr

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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
    • H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a technology for controlling a wireless terminal that performs wireless communication by switching between multiple channels.
  • Wireless communication systems including base stations and wireless terminals are known.
  • a typical example of a wireless communication system is a public wireless LAN (Local Area Network).
  • a wireless LAN for public use, for example, a use case is assumed in which data is transmitted from a base station to a wireless terminal such as a computer terminal or a smartphone terminal.
  • IoT Internet of Things
  • Non-Patent Document 1 In connection with wireless communication for IoT, the use of unlicensed Sub-1 GHz band has been institutionalized in various countries around the world (see Non-Patent Document 1). In Japan, the 920 MHz band is allocated as a frequency band for electronic tag systems. For example, LPWA (Low Power Wide Area) wireless communication systems such as LoRa (registered trademark) and WiSUN (registered trademark) are known as active electronic tag systems. Furthermore, the use of IEEE 802.11ah, which is one of the wireless LAN standards, is also being considered.
  • LPWA Low Power Wide Area wireless communication systems
  • LoRa registered trademark
  • WiSUN registered trademark
  • IEEE 802.11ah which is one of the wireless LAN standards, is also being considered.
  • the wireless communication device limits data transmission to comply with this total transmission time limit, throughput is also limited.
  • a total transmission time of up to 360 seconds for each channel per hour, or 720 seconds in total is allowed. Therefore, in order to improve throughput, it is conceivable to perform wireless communication while changing the channel used by the housing of the wireless communication device.
  • One object of the present invention is to provide a technology that can simplify the process of switching channels used by a wireless terminal.
  • the first aspect relates to wireless communication systems.
  • the wireless communication system is a wireless terminal including a plurality of wireless modules that perform wireless communication on mutually different channels; A base station that performs wireless communication with multiple wireless modules, A plurality of relay devices that relay wireless communication between each of the plurality of wireless modules and a base station are provided.
  • the wireless terminal uses one of the plurality of wireless modules as a used module, and stops data transmission from wireless modules other than the used module.
  • the base station is determining a usage schedule for each of the plurality of wireless modules so that the transmission time rate of each of the plurality of wireless modules of the wireless terminal does not exceed a predetermined upper limit; It is configured to notify the wireless terminal of usage schedule information.
  • Each of the plurality of wireless modules operates as a usage module according to a usage schedule determined by the base station.
  • the second aspect relates to a wireless communication control method that controls wireless communication between a wireless terminal and a base station via a plurality of relay devices.
  • a wireless terminal includes a plurality of wireless modules that perform wireless communication using different channels, uses one of the wireless modules as a used module, and stops data transmission from wireless modules other than the used module.
  • the plurality of relay devices relay wireless communication between each of the plurality of wireless modules and the base station.
  • the wireless communication control method is In the base station, determining a usage schedule for each of the plurality of wireless modules such that the transmission time rate of each of the plurality of wireless modules of the wireless terminal does not exceed a predetermined upper limit; Notifying usage schedule information from a base station to a wireless terminal; and operating each of the plurality of wireless modules as a usage module according to a usage schedule determined by the base station.
  • the third aspect relates to a base station that performs wireless communication with wireless terminals via a plurality of relay devices.
  • a wireless terminal includes a plurality of wireless modules that perform wireless communication using different channels, uses one of the wireless modules as a used module, and stops data transmission from wireless modules other than the used module.
  • the plurality of relay devices relay wireless communication between each of the plurality of wireless modules and the base station.
  • the base station includes a control unit.
  • the control section is determining a usage schedule for each of the plurality of wireless modules so that the transmission time rate of each of the plurality of wireless modules of the wireless terminal does not exceed a predetermined upper limit;
  • the information on the usage schedule is notified to the wireless terminal, and each of the plurality of wireless modules is configured to operate as a usage module according to the usage schedule.
  • a wireless terminal includes a plurality of wireless modules that perform wireless communication using mutually different channels.
  • the channel used for wireless communication can be easily changed. Since there is no need to switch channels within a single wireless module, it is possible to simplify the processing required for channel switching.
  • FIG. 1 is a block diagram showing the basic configuration of a wireless communication system according to an embodiment.
  • 3 is a timing chart for explaining an overview of data transmission control involving module switching processing according to an embodiment.
  • FIG. 2 is a block diagram for explaining an overview of a control unit according to an embodiment. It is a block diagram showing an example of composition of a control part concerning an embodiment.
  • 1 is a block diagram showing a configuration example of a wireless communication system according to an embodiment.
  • FIG. 2 is a conceptual diagram for explaining a first processing example by a control unit according to an embodiment.
  • 5 is a timing chart for explaining a first processing example by a control unit according to an embodiment.
  • 7 is a flowchart illustrating a first processing example by the control unit according to the embodiment.
  • FIG. 1 is a block diagram showing the basic configuration of a wireless communication system according to an embodiment.
  • 3 is a timing chart for explaining an overview of data transmission control involving module switching processing according to an embodiment.
  • FIG. 2 is a block
  • FIG. 7 is a conceptual diagram for explaining a second example of processing by the control unit according to the embodiment.
  • 7 is a timing chart for explaining a second example of processing by the control unit according to the embodiment.
  • 7 is a flowchart illustrating a second example of processing by the control unit according to the embodiment.
  • FIG. 7 is a conceptual diagram for explaining a third example of processing by the control unit according to the embodiment. It is a flowchart which shows the 3rd example of processing by a control part concerning an embodiment.
  • FIG. 1 is a block diagram showing the basic configuration of a wireless communication system 1 according to the present embodiment.
  • the wireless communication system 1 includes a wireless terminal 10, a base station 20, and a plurality of relay devices 30.
  • the wireless terminal 10 and the base station 20 perform wireless communication with each other via the relay device 30.
  • relay device 30 relays wireless communication between wireless terminal 10 and base station 20.
  • the relay device 30 also makes it possible to accommodate wireless terminals 10 that are far away from the base station 20.
  • the wireless communication system 1 is a wireless LAN system.
  • the wireless communication system 1 performs wireless communication using the unlicensed Sub-1 GHz band.
  • the wireless communication system 1 performs wireless communication using the 920 MHz band.
  • the wireless terminal 10 can perform wireless communication by switching between multiple channels (frequency channels). More specifically, the wireless terminal 10 includes a plurality of wireless modules 11 that perform wireless communication using different channels that do not overlap with each other. Each wireless module 11 includes, for example, a network interface controller (network interface card). The plurality of wireless modules 11 are each connected to the plurality of relay devices 30. That is, the plurality of wireless modules 11 perform wireless communication with the single base station 20 via each of the plurality of relay devices 30. In other words, the plurality of relay devices 30 relay wireless communication between each of the plurality of wireless modules 11 and the single base station 20.
  • network interface controller network interface card
  • the wireless terminal 10 includes a first wireless module 11-1 and a second wireless module 11-2.
  • the first wireless module 11-1 is set to perform wireless communication on the first channel CH-1.
  • the first wireless module 11-1 is connected to the first relay device 30-1 and performs wireless communication with the base station 20 via the first relay device 30-1 on the first channel CH-1.
  • the second wireless module 11-2 is set to perform wireless communication on a second channel CH-2 that does not overlap with the first channel CH-1.
  • the second wireless module 11-2 is connected to the second relay device 30-2 and performs wireless communication with the base station 20 via the second relay device 30-2 on the second channel CH-2.
  • Module Switching Process By switching the wireless module 11 used by the wireless terminal 10, the channel used for wireless communication can be easily switched.
  • One of the plurality of wireless modules 11 that is selectively used is hereinafter referred to as a "used module 11S.”
  • the usage module 11S can also be called a “selection module”. Further, the process of switching the used module 11S in the wireless terminal 10 will be referred to as “module switching process” hereinafter.
  • the wireless terminal 10 uses one of the plurality of wireless modules 11 as the module 11S to transmit data. More specifically, the wireless terminal 10 includes a plurality of wireless modules 11, as well as an upper layer 12 and a selector 13. The selector 13 receives transmission data from the upper layer 12 and outputs the transmission data to the usage module 11S. The selector 13 does not send the transmission data to any wireless module 11 other than the used module 11S. The used module 11S transmits transmission data from the upper layer 12, and the wireless modules 11 other than the used module 11S stop data transmission.
  • FIG. 2 is a timing chart for explaining an overview of data transmission control accompanied by module switching processing according to the present embodiment.
  • switching between the first wireless module 11-1 (first channel CH-1) and the second wireless module 11-2 (second channel CH-2) will be considered.
  • the first wireless module 11-1 is selected as the module to be used 11S. Data transmission from the first wireless module 11-1 is permitted, but data transmission from the second wireless module 11-2 is prohibited. That is, the period from time t1 to t2 is a transmission permission period PA for the first wireless module 11-1, and a transmission prohibition period PB for the second wireless module 11-2.
  • the wireless terminal 10 uses the first wireless module 11-1 as the usage module 11S, and performs wireless communication with the base station 20 on the first channel CH-1 via the first relay device 30-1. On the other hand, the wireless terminal 10 stops data transmission from the second wireless module 11-2.
  • the wireless terminal 10 switches the module 11S in use from the first wireless module 11-1 to the second wireless module 11-2.
  • the second wireless module 11-2 is selected as the module to be used 11S. Data transmission from the second wireless module 11-2 is permitted, but data transmission from the first wireless module 11-1 is prohibited. That is, the period from time t2 to t3 is a transmission prohibited period PB for the first wireless module 11-1, and a transmission permitted period PA for the second wireless module 11-2.
  • the wireless terminal 10 uses the second wireless module 11-2 as the usage module 11S, and performs wireless communication with the base station 20 on the second channel CH-2 via the second relay device 30-2. On the other hand, the wireless terminal 10 stops data transmission from the first wireless module 11-1.
  • the wireless terminal 10 switches the module 11S in use from the second wireless module 11-2 to the first wireless module 11-1.
  • the period from time t3 to t4 is the same as the period from time t1 to t2.
  • the transmission permission period PA does not overlap between the first wireless module 11-1 and the second wireless module 11-2. Furthermore, the transmission prohibition period PB does not overlap between the first wireless module 11-1 and the second wireless module 11-2.
  • the transmission time rate of each wireless module 11 can be calculated from the transmission time of each wireless module 11 in the measurement period PM.
  • the wireless communication system 1 includes a "control unit 100" that manages and controls the module switching process.
  • FIG. 3 is a block diagram for explaining an overview of the control unit 100.
  • the control unit 100 monitors and manages the transmission time and transmission time rate of each of the plurality of wireless modules 11 (multiple channels) of the wireless terminal 10 . Then, the control unit 100 determines a usage schedule for each of the plurality of wireless modules 11 so that the transmission time rate of each of the plurality of wireless modules 11 of the wireless terminal 10 does not exceed a predetermined upper limit.
  • the usage schedule includes a transmission permission period PA assigned to each wireless module 11.
  • the usage schedule can also be called transmission timing.
  • the usage schedule is determined so that at least the transmission time rate of each wireless module 11 does not exceed a predetermined upper limit.
  • control unit 100 controls the wireless terminal 10 to perform module switching processing according to the determined usage schedule. That is, the control unit 100 controls the wireless terminal 10 to switch the usage module 11S according to the determined usage schedule. The wireless terminal 10 switches the usage module 11S according to the usage schedule determined by the control unit 100. Each wireless module 11 operates as a usage module 11S according to the usage schedule determined by the control unit 100.
  • the wireless terminal 10 includes a plurality of wireless modules 11 that perform wireless communication using mutually different channels.
  • the channel used for wireless communication can be easily changed. Since there is no need to switch channels within a single wireless module 11, it is possible to simplify the processing required for channel switching. Furthermore, since restarting the wireless terminal 10 is not required for channel switching, communication interruption time is reduced and service quality is prevented from deteriorating.
  • the control unit 100 determines the usage schedule of each wireless module 11 so that the transmission time rate of each wireless module 11 of the wireless terminal 10 does not exceed a predetermined upper limit. Since the control unit 100 accurately manages the transmission time rate of each wireless module 11, it is possible to use each channel up to the upper limit of the transmission time rate. That is, it becomes possible to expand the transmission time rate of the wireless terminal 10 as a whole and effectively improve throughput.
  • the wireless terminal 10 since the wireless terminal 10 includes a plurality of wireless modules 11, redundancy is ensured and reliability is improved.
  • the relay device 30 also makes it possible to accommodate a wireless terminal 10 that is far away from the base station 20.
  • FIG. 4 is a block diagram showing a configuration example of the control unit 100 according to the present embodiment.
  • the control unit 100 includes one or more processors 110 (hereinafter simply referred to as "processors 110") and one or more storage devices 120 (hereinafter simply referred to as “storage devices 120"). It is a computer equipped with.
  • processor 110 includes a CPU (Central Processing Unit).
  • the storage device 120 stores various information necessary for processing by the processor 110. Examples of the storage device 120 include volatile memory, nonvolatile memory, HDD (Hard Disk Drive), SSD (Solid State Drive), and the like.
  • the control program 130 is a computer program executed by the processor 110.
  • the functions of the control unit 100 are realized by the processor 110 executing the control program 130.
  • Control program 130 is stored in storage device 120.
  • the control program 130 may be recorded on a computer-readable recording medium.
  • the control program 130 may be provided to the control unit 100 via a network.
  • Module switching management information 200 is stored in the storage device 120.
  • Module switching management information 200 is information for managing module switching processing.
  • the module switching management information 200 includes the transmission time and transmission time rate of each of the plurality of wireless modules 11 of the wireless terminal 10.
  • the module switching management information 200 may include a usage schedule for each of the plurality of wireless modules 11.
  • the usage schedule includes a transmission permission period PA (eg, a combination of start time and duration) assigned to each wireless module 11.
  • PA transmission permission period assigned to each wireless module 11.
  • the usage schedule can also be called transmission timing.
  • the storage device 120 may further store relay device status information 300.
  • Relay device status information 300 indicates the status of each relay device 30 connected to base station 20.
  • Relay device status information 300 includes identification information of each relay device 30.
  • the relay device status information 300 includes information (number, etc.) of the wireless terminals 10 and wireless modules 11 under each relay device 30.
  • the relay device status information 300 may include the distance between each relay device 30 and the subordinate wireless terminal 10.
  • the relay device status information 300 may include the traffic status and transmission time rate of each relay device 30.
  • the relay device status information 300 may include the used channel and transmission power of each relay device 30.
  • the control unit 100 communicates with each relay device 30 and acquires relay device status information 300 from each relay device 30.
  • FIG. 5 is a block diagram showing a configuration example of the wireless communication system 1 when the base station 20 includes the control unit 100. Since the base station 20 includes the control unit 100, it becomes possible to efficiently determine the usage schedule of each wireless module 11 of each wireless terminal 10. Moreover, complicated processing in the wireless terminal 10 is not necessary.
  • FIG. 6 is a conceptual diagram for explaining a first processing example by the control unit 100 included in the base station 20.
  • FIG. 7 is a timing chart for explaining a first processing example by the control unit 100 included in the base station 20.
  • the control unit 100 monitors the transmission time and transmission time rate of each of the plurality of wireless modules 11 of the wireless terminal 10, and updates the module switching management information 200 (see FIG. 4). Further, the control unit 100 determines a usage schedule for each of the plurality of wireless modules 11. For example, the control unit 100 basically determines the usage schedule of each wireless module 11 so that the usage module 11S is switched at regular intervals. However, the control unit 100 determines the usage schedule of each wireless module 11 based on the module switching management information 200 so that the transmission time rate of each wireless module 11 does not exceed a predetermined upper limit. Although the trigger for the module switching process is arbitrary, the usage schedule is determined so that at least the transmission time rate of each wireless module 11 does not exceed a predetermined upper limit.
  • the usage schedule includes a transmission permission period PA assigned to each wireless module 11, that is, a transmission permission period PA during which each wireless module 11 operates as a usage module 11S.
  • the transmission permission period PA is defined, for example, by a combination of a start time and a duration.
  • the transmission permission period PA is set so as not to overlap among the plurality of wireless modules 11.
  • the control unit 100 instructs the wireless terminal 10 to switch the usage module 11S according to the determined usage schedule. More specifically, the control unit 100 generates schedule information SKD indicating the determined usage schedule, and notifies the wireless terminal 10 of the schedule information SKD.
  • Each of the plurality of wireless modules 11 operates as a usage module 11S according to a usage schedule determined by the control unit 100. That is, the wireless terminal 10 switches the usage module 11S according to the usage schedule determined by the control unit 100.
  • the first wireless module 11-1 and the second wireless module 11-2 of the wireless terminal 10 are connected to the first relay device 30-1 and the second relay device 30-2, respectively. It is connected.
  • the control unit 100 determines a usage schedule regarding the first wireless module 11-1. At this time, the control unit 100 determines the usage schedule of the first wireless module 11-1 based on the module switching management information 200 so that the transmission time rate of the first wireless module 11-1 does not exceed a predetermined upper limit. do. Then, the control unit 100 transmits first schedule information SKD-1 regarding the usage schedule of the first wireless module 11-1 to the first relay device 30-1 connected to the first wireless module 11. The first relay device 30-1 receives the first schedule information SKD-1 and transmits the first schedule information SKD-1 to the first wireless module 11-1. That is, the control unit 100 notifies the first schedule information SKD-1 to the first wireless module 11-1 via the first relay device 30-1.
  • TWT Target Wake Time
  • the first wireless module 11-1 operates as the usage module 11S according to the first schedule information SKD-1 determined by the control unit 100. That is, the first wireless module 11-1 operates as the usage module 11S during the transmission permission period PA determined by the control unit 100.
  • the first relay device 30-1 relays wireless communication between the base station 20 and the first wireless module 11-1 according to the first schedule information SKD-1.
  • control unit 100 determines a usage schedule regarding the second wireless module 11-2. At this time, the control unit 100 determines the usage schedule of the second wireless module 11-2 based on the module switching management information 200 so that the transmission time rate of the second wireless module 11-2 does not exceed a predetermined upper limit. do. Then, the control unit 100 transmits second schedule information SKD-2 regarding the usage schedule of the second wireless module 11-2 to the second relay device 30-2 connected to the second wireless module 11. The second relay device 30-2 receives the second schedule information SKD-2 and transmits the second schedule information SKD-2 to the second wireless module 11-2. That is, the control unit 100 notifies the second wireless module 11-2 of the second schedule information SKD-2 via the second relay device 30-2. At this time, TWT may be used.
  • the second wireless module 11-2 operates as the usage module 11S according to the second schedule information SKD-2 determined by the control unit 100. That is, the second wireless module 11-2 operates as the usage module 11S during the transmission permission period PA determined by the control unit 100.
  • the second relay device 30-2 relays wireless communication between the base station 20 and the second wireless module 11-2 according to the second schedule information SKD-2.
  • the control unit 100 may also consider the timing of downlink traffic from the base station 20 and determine the schedule to match the timing of downlink traffic from the base station 20.
  • the control unit 100 may update the usage schedule of each wireless module 11. For example, the control unit 100 grasps the communication quality and traffic situation of the base station 20. The traffic situation may include the transmission time rate of the base station 20. The control unit 100 updates the usage schedule of each wireless module 11 based on the communication quality and traffic situation of the base station 20. Then, the control unit 100 notifies the wireless module 11 of schedule information SKD indicating the updated usage schedule.
  • FIG. 8 is a flowchart showing a first processing example by the control unit 100 included in the base station 20.
  • step S110 the control unit 100 determines whether a connection state update notification has been received from any relay device 30.
  • the connection state update notification is a notification indicating that the connection state between the relay device 30 and the wireless terminal 10 (wireless module 11) has been updated. If a connection state update notification is received (step S110; Yes), the process proceeds to step S111.
  • step S111 the control unit 100 determines a usage schedule for each wireless module 11 under the relay device 30. At this time, the usage schedule of each wireless module 11 is determined so that the transmission permission periods PA do not overlap among the multiple wireless modules 11.
  • step S112 the control unit 100 notifies the corresponding wireless module 11 of schedule information SKD indicating the usage schedule via the relay device 30.
  • the control unit 100 determines the usage schedule of each wireless module 11 so that the transmission time rate of each wireless module 11 of the wireless terminal 10 does not exceed a predetermined upper limit. Since the control unit 100 accurately manages the transmission time rate of each wireless module 11, it is possible to use each channel up to the upper limit of the transmission time rate. That is, it becomes possible to expand the transmission time rate of the wireless terminal 10 as a whole and effectively improve throughput.
  • the base station 20 since the base station 20 includes the control unit 100, it is possible to efficiently determine the usage schedule of each wireless module 11 of each wireless terminal 10. Moreover, complicated processing in the wireless terminal 10 is not necessary.
  • connection process between the wireless module 11 and the relay device 30 will be considered in particular.
  • the control unit 100 specifies the optimal one from among the plurality of relay devices 30 (connection destination candidates).
  • the control unit 100 constantly monitors the status of each relay device 30 connected to the base station 20 and updates the relay device status information 300 (see FIG. 4).
  • the relay device status information 300 includes information on the wireless terminals 10 and wireless modules 11 under each relay device 30.
  • the relay device status information 300 includes the traffic status of each relay device 30 and the transmission time rate as a relay device.
  • the control unit 100 sets the priority of each relay device 30 based on the relay device status information 300. For example, the control unit 100 grasps the congestion status of the relay device 30 based on the available bandwidth, the number of connected terminals, and the like. Then, the control unit 100 lowers the priority of the relay device 30 with less available radio resources. As another example, if there is also a restriction on the transmission time rate regarding the downlink traffic from the relay device 30 to the wireless terminal 10, the control unit 100 grasps the current status of the downlink traffic and the transmission time rate. Then, the control unit 100 lowers the priority of the relay device 30 with less margin in the transmission time rate. Then, the control unit 100 selects a relay device 30 to which the wireless module 11 is connected according to the priority of each relay device 30.
  • FIGS. 9 and 10 A second processing example will be described with reference to FIGS. 9 and 10.
  • the base station 20 is connected to a first relay device 30-1, a second relay device 30-2, and a third relay device 30-3.
  • the first wireless module 11-1 of the wireless terminal 10 transmits a connection destination inquiry INQ to the nearby relay device 30.
  • each relay device 30 Upon receiving the connection destination inquiry INQ, each relay device 30 transmits a connection destination inquiry notification NTF to the control unit 100.
  • the control unit 100 selects the connection destination of the first wireless module 11-1 from among the relay devices 30 that are not connected to other wireless modules 11.
  • the control unit 100 sets the priority of each relay device 30 based on the relay device status information 300, and selects the connection destination of the first wireless module 11-1 according to the priority.
  • the first relay device 30-1 has the highest priority and is selected.
  • the control unit 100 instructs the selected first relay device 30-1 to respond to the first wireless module 11-1.
  • the first relay device 30-1 returns a response RES to the first wireless module 11-1, which is the connection destination inquiry source.
  • connection processing is performed between the first wireless module 11-1 and the first relay device 30-1.
  • the second wireless module 11-2 of the wireless terminal 10 transmits a connection destination inquiry INQ to the nearby relay device 30.
  • each relay device 30 transmits a connection destination inquiry notification NTF to the control unit 100.
  • the control unit 100 selects the connection destination of the second wireless module 11-2 from among the relay devices 30 that are not connected to other wireless modules 11.
  • the control unit 100 sets the priority of each relay device 30 based on the relay device state information 300, and selects the connection destination of the second wireless module 11-2 according to the priority.
  • the second relay device 30-2 has the highest priority and is selected.
  • the control unit 100 instructs the selected second relay device 30-2 to respond to the second wireless module 11-2.
  • the second relay device 30-2 returns a response RES to the second wireless module 11-2, which is the connection destination inquiry source.
  • connection processing is performed between the second wireless module 11-2 and the second relay device 30-2.
  • FIG. 11 is a flowchart showing a second example of processing by the control unit 100 included in the base station 20.
  • step S120 the control unit 100 determines whether a connection destination inquiry notification NTF has been received from at least one relay device 30.
  • the connection destination inquiry notification NTF is a notification indicating that the relay device 30 has received the connection destination inquiry INQ from the wireless module 11. If the connection destination inquiry notification NTF is received (step S120; Yes), the process proceeds to step S121.
  • step S121 the control unit 100 sets the priority of each relay device 30 based on the relay device status information 300. Then, the control unit 100 selects one relay device 30 to which the wireless module 11 is connected based on the priority of each relay device 30.
  • step S122 the control unit 100 instructs the selected relay device 30 to respond to the wireless module 11 that is the connection destination inquiry source.
  • the second processing example it is possible to appropriately select the connection destination of the wireless module 11 according to the state of the relay device 30 (traffic, transmission time rate, etc.). Become.
  • the first processing example and the second processing example described above it is possible to further efficiently improve throughput.
  • FIG. 12 is a conceptual diagram for explaining a third processing example by the control unit 100 included in the base station 20.
  • the control unit 100 determines at least one of the channel used and the transmission power of each relay device 30.
  • the control unit 100 constantly monitors the status of each of the multiple relay devices 30 connected to each of the multiple wireless modules 11, and updates the relay device status information 300 (see FIG. 4).
  • the relay device status information 300 includes information on the wireless terminals 10 and wireless modules 11 under each relay device 30.
  • the relay device status information 300 includes the distance between each relay device 30 and the subordinate wireless terminal 10.
  • the relay device status information 300 includes the traffic status and used channels of each relay device 30.
  • the control unit 100 determines at least one of the channel used and the transmission power of each relay device 30 based on the relay device status information 300. For example, the control unit 100 increases the transmission power of the relay device 30 as the distance between the relay device 30 and the subordinate wireless terminal 10 increases. As another example, the control unit 100 may determine the channels used by each relay device 30 so that the channels used do not overlap among the plurality of relay devices 30. As still another example, the control unit 100 may determine the channel to be used by each relay device 30 based on the communication state and communication quality between the base station 20 and each relay device 30.
  • the control unit 100 instructs each relay device 30 to operate according to the determined usage channel/transmission power. More specifically, the control unit 100 generates relay device control information CON indicating the used channel/transmission power determined for each relay device 30. Then, the control unit 100 notifies each relay device 30 of the relay device control information CON. Each relay device 30 operates according to the used channel/transmission power indicated by the relay device control information CON.
  • the control unit 100 generates first relay device control information CON-1 indicating the used channel/transmission power determined for the first relay device 30-1. Then, the control unit 100 notifies the first relay device 30-1 of the first relay device control information CON-1. The first relay device 30-1 operates according to the used channel/transmission power indicated by the first relay device control information CON-1. The same applies to the second relay device 30-2.
  • FIG. 13 is a flowchart showing a third example of processing by the control unit 100 included in the base station 20.
  • step S130 the control unit 100 determines whether a connection state update notification has been received from any relay device 30.
  • the connection state update notification is a notification indicating that the connection state between the relay device 30 and the wireless terminal 10 (wireless module 11) has been updated. If a connection status update notification is received (step S130; Yes), the process proceeds to step S131.
  • step S131 the control unit 100 determines at least one of the channel used and the transmission power of the relay device 30 based on the relay device state information 300.
  • step S132 the control unit 100 instructs the relay device 30 to operate according to the determined usage channel/transmission power.
  • the third processing example it is possible to improve communication quality by controlling the transmission power of the relay device 30 and the channels used.
  • 1...Wireless communication system 10...Wireless terminal, 11...Wireless module 11, 11-1...First wireless module, 11-2...Second wireless module, 11S...Using module, 12...Upper layer, 13...Selector, 20 ...Base station, 30...Relay device, 30-1...First relay device, 30-2...Second relay device, 100...Control unit, 110...Processor, 120...Storage device, 130...Control program, 200...Module switching Management information, 300...Relay device status information, CON...Relay device control information, INQ...Connection destination inquiry, NTF...Connection destination inquiry notification, PA...Transmission permission period, PB...Transmission prohibition period, SKD...Schedule information

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

Abstract

L'invention porte sur un système de communication sans fil qui comprend : un terminal sans fil qui comprend une pluralité de modules sans fil destinés à effectuer une communication sans fil dans des canaux différents les uns des autres ; une station de base qui effectue une communication sans fil avec la pluralité de modules sans fil ; et une pluralité de dispositifs relais qui relaient la communication sans fil entre la station de base et chacun parmi la pluralité de modules sans fil. Le terminal sans fil utilise l'un parmi la pluralité de modules sans fil en tant que module d'utilisation et arrête la transmission de données à partir de modules sans fil autres que le module d'utilisation. La station de base détermine un programme d'utilisation pour chacun parmi la pluralité de modules sans fil de telle sorte que le rapport de temps de transmission de chacun parmi la pluralité de modules sans fil du terminal sans fil ne dépasse pas une limite supérieure prescrite. De plus, la station de base notifie à chaque module sans fil des informations relatives au programme d'utilisation déterminé. Chaque module sans fil fonctionne en tant que module d'utilisation conformément au programme d'utilisation déterminé par la station de base.
PCT/JP2022/018310 2022-04-20 2022-04-20 Système de communication sans fil, procédé de commande de communication sans fil et station de base WO2023203689A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015029197A (ja) * 2013-07-30 2015-02-12 株式会社バッファロー インターネット接続システム、データ中継機能を有する携帯端末、サーバ装置、無線ｌａｎ端末をインターネットに接続する接続方法、および、データ中継機能を有するコンピュータが実行するコンピュータプログラム
JP2021509232A (ja) * 2017-12-30 2021-03-18 インテル コーポレイション 無線通信の方法および装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015029197A (ja) * 2013-07-30 2015-02-12 株式会社バッファロー インターネット接続システム、データ中継機能を有する携帯端末、サーバ装置、無線ｌａｎ端末をインターネットに接続する接続方法、および、データ中継機能を有するコンピュータが実行するコンピュータプログラム
JP2021509232A (ja) * 2017-12-30 2021-03-18 インテル コーポレイション 無線通信の方法および装置

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