WO2023203718A1 - Procédé et système de communication sans fil - Google Patents

Procédé et système de communication sans fil Download PDF

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Publication number
WO2023203718A1
WO2023203718A1 PCT/JP2022/018407 JP2022018407W WO2023203718A1 WO 2023203718 A1 WO2023203718 A1 WO 2023203718A1 JP 2022018407 W JP2022018407 W JP 2022018407W WO 2023203718 A1 WO2023203718 A1 WO 2023203718A1
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Prior art keywords
base station
wireless base
wireless
connection
normalized
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PCT/JP2022/018407
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English (en)
Japanese (ja)
Inventor
健 福島
元晴 佐々木
俊朗 中平
大輔 村山
貴庸 守山
Original Assignee
日本電信電話株式会社
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Priority to PCT/JP2022/018407 priority Critical patent/WO2023203718A1/fr
Publication of WO2023203718A1 publication Critical patent/WO2023203718A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information

Definitions

  • the present invention relates to a wireless communication method and a wireless communication system.
  • connection control between a wireless base station and a wireless terminal a wireless communication system is known that uses blockchain technology to perform distributed processing of connection control (for example, see Non-Patent Document 1).
  • wireless terminals In conventional technology, wireless terminals (user terminals) autonomously decide which wireless base station to connect to, so wireless terminals are biased in connecting to a specific wireless base station (for example, a wireless base station with low connection cost). The usage efficiency of radio resources in the entire radio communication system may decrease.
  • the embodiments of the present invention have been made in view of the above-mentioned problems, and improve the utilization efficiency of radio resources in the entire radio communication system.
  • a wireless communication method includes a transmission process in which a wireless base station broadcasts connection conditions of the wireless base station, and a transmission process in which a wireless base station broadcasts connection conditions of the wireless base station based on the connection conditions.
  • a management process that uses a blockchain shared by multiple wireless base stations to manage connections with wireless terminals that request connection to a wireless base station, and a management process that uses a blockchain shared by multiple wireless base stations to normalize connections with other wireless base stations using the ledger information of the blockchain.
  • a calculation process for calculating the degree of congestion and a change process for changing the connection condition of the wireless base station based on the normalized degree of congestion are executed.
  • FIG. 1 is a diagram illustrating an example of a system configuration of a wireless communication system according to an embodiment.
  • FIG. 2 is a diagram for explaining a blockchain network according to the present embodiment.
  • FIG. 2 is a diagram illustrating an example of the functional configuration of a wireless base station according to the present embodiment.
  • FIG. 2 is a diagram illustrating an example of the functional configuration of a wireless terminal according to the present embodiment.
  • 3 is a flowchart illustrating an example of processing by a wireless base station according to the present embodiment.
  • 3 is a flowchart illustrating an example of processing by a wireless terminal according to the present embodiment.
  • FIG. 3 is a diagram illustrating an example of a functional configuration of a calculation unit according to the first embodiment.
  • FIG. 7 is a flowchart illustrating an example of connection condition changing processing according to the first embodiment.
  • 7 is a diagram illustrating a specific example of connection condition changing processing according to the first embodiment.
  • FIG. 7 is a flowchart illustrating an example of connection condition changing processing according to the second embodiment.
  • 7 is a diagram illustrating a specific example of connection condition changing processing according to the second embodiment.
  • FIG. FIG. 2 is a diagram showing an example of the hardware configuration of a wireless base station and a wireless terminal according to the present embodiment.
  • FIG. 2 is a diagram (1) for explaining an example of the effect of the wireless communication method according to the present embodiment.
  • FIG. 3 is a diagram (2) for explaining an example of the effect of the wireless communication method according to the present embodiment.
  • FIG. 2 is a diagram for explaining an overview of processing of a wireless communication system using blockchain.
  • FIG. 2 is a diagram for explaining issues of a wireless communication system using blockchain.
  • Wireless communication systems connect wireless terminals to wireless base stations without centralized management by using blockchain technology to perform connection processing in a distributed manner when connecting wireless base stations and wireless terminals. This is a possible system.
  • FIG. 15 is a diagram for explaining an overview of processing of a wireless communication system using blockchain.
  • transaction data 2 is created between the wireless base station 10 and the wireless terminal 20 in a connection process in which the wireless terminal 20 connects to the wireless base station 10 (step S1).
  • the wireless terminal 20 receives the connection conditions broadcasted by the wireless base station 10, and checks the communication quality, connection cost, etc. of the wireless communication network provided by the wireless base station 10.
  • the wireless base station 10 checks whether the wireless terminal 20 has sufficient ability to pay. Further, when an agreement regarding connection conditions is obtained between the wireless base station 10 and the wireless terminal 20, the wireless base station 10 records the content of the agreement in the transaction data 2.
  • the communication quality of the wireless communication network provided by the wireless base station 10 includes, for example, throughput, total data amount, etc.
  • the wireless terminal 20 may agree to the connection conditions when the communication quality provided by the wireless base station 10 satisfies all the communication quality required by the wireless terminal 20.
  • the wireless terminal 20 may agree to the connection conditions when the communication quality provided by the wireless base station 10 satisfies a part of the communication quality required by the wireless terminal 20.
  • the wireless base station 10 spreads the transaction data 2 created in the connection process to the nodes participating in the blockchain network 30 (step S2).
  • the blockchain network 30 includes a plurality of nodes that collectively record transaction data 2 in blocks and share a blockchain (distributed ledger) in which a plurality of blocks are recorded in chronological order.
  • the plurality of nodes include a plurality of wireless base stations 10 that constitute a wireless communication system. Note that the plurality of nodes may include nodes (computers, wireless terminals, etc.) other than the wireless base station 10.
  • step S3 When the blockchain network 30 is notified of the transaction data 2, some nodes (for example, the wireless base station 10x) participating in the blockchain network 30 generate a block 3 together with other transaction data (step S3). Furthermore, after generating the block 3, the blockchain network 30 adds the generated block 3 to the blockchain 40 possessed by each node included in the blockchain network 30 (step S4).
  • the blockchain 40 of each node reserves the added block, and after a predetermined number of blocks (verification blocks) are further added to the blockchain, the contract is established by accepting the pending block (step S5 ). After the contract is established, the wireless base station 10 starts communication with the wireless terminal 20 (step S6).
  • the wireless communication system can perform connection processing between the wireless base station 10 and the wireless terminal 20 through distributed control, without relying on a control station or the like that centrally controls the wireless communication system.
  • the wireless terminal (user terminal) 20 takes the lead in that the wireless terminal 20 checks the connection conditions transmitted by one or more wireless base stations 10 and determines the wireless base station 10 with which to request connection. This is the control procedure.
  • the wireless terminals 20 connected to a specific wireless base station 10 may be biased, and the efficiency of using the wireless resources of the entire wireless communication system may decrease.
  • FIG. 16 is a diagram for explaining the problems of wireless communication systems using blockchain.
  • the wireless communication system 1 includes a plurality of wireless base stations 10a, 10b, and 10c as an example for explanation. Note that the wireless base stations may (or may not) include the indoor wireless base station 10c.
  • the wireless base station 10a forms a network cell 11a and is capable of communicating with wireless terminals 20a, 20b, 20c, and 20f within the network cell 11a.
  • the wireless base station 10b forms a network cell 11b and is capable of communicating with wireless terminals 20b and 20e within the network cell 11b.
  • the wireless base station 10c forms a network cell 11c and is capable of communicating with wireless terminals 20c and 20d within the network cell 11c.
  • each wireless terminal 20 autonomously determines the wireless base station to which it will connect, for example, as shown in FIG. You may become concentrated. Furthermore, if the wireless terminal 20f connects to a nearby wireless base station 10a when starting a new communication, for example, the wireless resource usage efficiency of the entire wireless communication system 1 will further decrease. There is a risk of it being stored away.
  • FIG. 1 is a diagram showing an example of the system configuration of a wireless communication system according to this embodiment.
  • the wireless communication system 100 includes a plurality of wireless base stations 110a, 110b, 110c, 110d, 110e, . . . that form mutually different network cells.
  • the wireless base station 110a forms a network cell 111a and can communicate with a wireless terminal 120b located within the network cell 111a.
  • the wireless base station 110b forms a network cell 111b, and is capable of communicating with a wireless terminal 120a located within the network cell 111b.
  • the wireless base station 110c forms a network cell 111c and can communicate with wireless terminals 120b, 120c, and 120d within the network cell 111c.
  • the radio base station 110d forms a network cell 111d
  • the radio base station 110e forms a network cell 111e.
  • wireless base station 110 is used to refer to any wireless base station among the wireless base stations 110a, 110b, 110c, 110d, 110e, . Further, when referring to any wireless terminal among the wireless terminals 120a, 120b, 120c, and 120d, “wireless terminal 120" is used.
  • the number of wireless base stations 110 and the number of wireless terminals 120 shown in FIG. 1 are merely examples, and other numbers may be used.
  • the multiple wireless base stations 110 also function as nodes that participate in the blockchain network 200, and the multiple wireless base stations 110 share the same blockchain.
  • the blockchain network 200 is a P2P (Peer-to-Peer) network (distributed network) in which each node can send and receive data equally with other nodes without using a server or the like.
  • a blockchain is a distributed ledger in which multiple nodes participating in a P2P network record transactions, etc. between two parties in a verifiable and permanent manner.
  • the blockchain network 30 may include nodes other than the wireless base station 110 (for example, other computers, wireless terminals, etc.).
  • Each wireless base station 110 manages connections with wireless terminals 120 using blockchain. For example, each wireless base station 110 records and manages transaction data 2 and the like described in FIG. 15 in a blockchain shared by multiple wireless base stations 110. Thereby, the wireless base station 110 can obtain information regarding other wireless base stations 110 by referring to the blockchain.
  • Each wireless base station 110 broadcasts connection conditions for connecting to the wireless base station 110 to the wireless terminals 120 within the network cell 111 of the wireless base station.
  • the connection conditions include, for example, information such as the communication quality to be provided and the connection cost (connection fee) for connecting to the wireless base station 110.
  • a wireless terminal 120 that starts communication receives connection conditions transmitted by nearby wireless base stations 110, and determines a wireless base station 110 with which to request connection based on the connection conditions. For example, the wireless terminal 120 selects a wireless base station 110 that satisfies the communication quality required by the wireless terminal 120 and has the lowest connection cost among the one or more wireless base stations 110 that have received connection conditions. The wireless base station 110 to be requested is determined.
  • traffic may concentrate on a specific wireless base station 110, similar to the wireless communication system 1 described in FIGS. 15 and 16.
  • wireless terminal 120a is connected to wireless base station 110
  • wireless terminals 120c and 120d are connected to wireless base station 110c.
  • the wireless terminal 120b when the wireless terminal 120b starts a new communication, in order to reduce the congestion level of the wireless base station 110c, the wireless terminal 120b connects to the less congested wireless base station 110a. It is difficult to control as such. For example, in the wireless communication method described in FIGS. 15 and 16, it is not possible to preferentially connect the wireless terminal 120b in FIG. 1 to the wireless base station 110a, which is less congested.
  • controlling the optimal connection destination for all wireless terminals 120 through centralized control of the control station that oversees the wireless communication system 1 becomes difficult as the number of wireless base stations 110 and wireless terminals 120 increases. This is not realistic as the amount would be huge.
  • the wireless base station 110 has a function of calculating the normalized congestion degree of other wireless base stations 110 using blockchain ledger information shared by a plurality of wireless base stations 110. ing.
  • the wireless base station 110 obtains the maximum communication quality (for example, maximum throughput) of another wireless base station 110 and the number of wireless terminals accommodated by the other wireless base station 110 from the blockchain. Furthermore, the radio base station 110 normalizes the number of radio terminals accommodated by the other radio base station 110 based on the ratio of the maximum communication quality of its own station and the maximum communication quality of the other radio base station 110. Calculate the degree of congestion.
  • the maximum communication quality for example, maximum throughput
  • the wireless base station 110 obtains the average communication quality of other wireless base stations 110 and the number of wireless terminals accommodated by the other wireless base stations 110 from the blockchain. Furthermore, the radio base station 110 normalizes the average communication quality of other radio base stations 110 based on the ratio of the number of radio terminals accommodated by the radio base station 110 and the number of radio terminals accommodated by the other radio base stations 110. , a normalized degree of congestion may be calculated.
  • the wireless base station 110 has a function of controlling the connection cost of the wireless base station 110 based on the normalized degree of congestion between the wireless base station 110 and other wireless base stations 110. For example, the wireless base station 110 lowers the connection cost of the wireless base station 110 when the normalized degree of congestion of another wireless base station 110 is higher than that of the wireless base station 110. Alternatively, the wireless base station 110 increases the connection cost of the wireless base station 110 when the normalized degree of congestion of another wireless base station 110 is lower than that of the wireless base station 110.
  • the wireless terminal 120b newly starting communication prioritizes the wireless base station 110a, which has a lower connection cost than the wireless base station 110c, as a connection destination. It can be controlled to select the
  • the wireless base station 110 controls the connection cost of its own station, for example, based on the number of wireless terminals accommodated by the wireless base station 110 and other wireless base stations 110 instead of the normalized degree of congestion. Conceivable.
  • this method cannot take into account the difference in performance (communication quality) of each radio base station 110, so for example, the usage efficiency of the radio base station 110 with high communication quality may decrease, or the communication quality of the radio terminal 120 may be affected. There are problems such as differences occurring.
  • the wireless communication system 100 since the connection cost of the own station is controlled based on the normalized degree of congestion, a decrease in the utilization efficiency of the wireless base station 110 with high communication quality is suppressed, and Communication quality of wireless terminal 120 can be smoothed.
  • FIG. 3 is a diagram showing an example of the functional configuration of the wireless base station according to the present embodiment.
  • the wireless base station 110 includes, for example, a computer configuration, and when the computer executes a predetermined program, a wireless communication section 301, a transmission section 302, a management section 303, a calculation section 304, a change section 305, and a storage section 306 are configured. , a wired communication unit 307, etc. Note that at least some of the above functional configurations may be realized by hardware.
  • the wireless communication unit 301 forms a network cell 111 capable of wireless communication with the wireless base station 110, and executes wireless communication processing to perform wireless communication with a wireless terminal 120 connected to the wireless base station 110.
  • the transmitting unit 302 executes a transmission process of broadcasting connection conditions for connecting to the wireless base station 110 to the wireless terminals 120 within the network cell 111 of the wireless base station 110.
  • the connection conditions include, for example, information such as the communication quality provided by the wireless base station 110 and the connection cost (connection fee) for connecting to the wireless base station 110.
  • the management unit 303 executes management processing for managing information on the wireless terminals 120 that connect to the wireless base station 110 based on the connection conditions transmitted by the transmitting unit 302 using a blockchain shared by a plurality of wireless base stations 110. do.
  • the management unit 303 can connect the wireless terminal 120 that requests connection to the wireless base station 110 and the blocks shared with other wireless base stations 110 by executing the series of processes described in steps S1 to S6 in FIG. 15. Connection information with the wireless terminal 120 is recorded in the chain 320.
  • the management unit 303 executes various processes to manage the blockchain as a node of the blockchain shared by the plurality of wireless base stations 110.
  • information on wireless terminals 120 connected to each wireless base station 110 in wireless communication system 100 is recorded in blockchain 320. Therefore, by referring to the blockchain 320, the wireless base station 110 can obtain information on the wireless terminals 120 that connect to other wireless base stations 110, the communication quality of the wireless communication network provided by the other wireless base stations 110, and the connection. Information such as costs can be obtained.
  • the calculation unit 304 uses the ledger information of the blockchain 320 to execute calculation processing to calculate the normalized congestion degree of other wireless base stations 110. Note that the specific processing contents of the calculation process executed by the calculation unit 304 will be described later by illustrating a plurality of embodiments.
  • the changing unit 305 changes the connection condition of the wireless base station 110 based on the normalized degree of congestion calculated by the calculating unit 304. For example, when the own station (wireless base station 110) is congested, the changing unit 305 increases the connection cost of the own station. Furthermore, when the changing unit 305's own station is not congested, the connection cost of the own station is lowered.
  • connection cost is the cost (for example, connection fee) for the wireless terminal 120 to connect to the wireless base station 110, and the wireless terminal 120, for example, Among them, the wireless base station 110 with the lowest connection cost is connected preferentially.
  • the wireless terminal 120 may decide which wireless base station 110 to connect to by taking into account the strength of the received signal from the wireless base station 110, the communication speed, etc. in addition to the connection cost.
  • the transmitting unit 302, the managing unit 303, the calculating unit 304, the changing unit 305, and the like are included in a communication control unit 310 that controls wireless communication by the wireless communication unit 301, for example.
  • the storage unit 306 executes storage processing to store various data, information, programs, etc., including the blockchain 320, in a storage device included in the wireless base station 110, for example.
  • the wired communication unit 307 connects the wireless base station 110 to, for example, a wired communication network, and executes communication related to the blockchain network 200 as shown in FIG. 2, for example.
  • FIG. 4 is a diagram illustrating an example of the functional configuration of a wireless terminal according to this embodiment.
  • the wireless terminal 120 has, for example, a computer configuration, and the computer executes a predetermined program to realize a wireless communication section 401, a reception section 402, a determination section 403, a connection control section 404, a storage section 405, etc. are doing. Note that at least some of the above functional configurations may be realized by hardware.
  • the wireless communication unit 401 connects to the wireless base station 110 by wireless communication and executes wireless communication processing to transmit and receive data.
  • the receiving unit 402 uses the wireless communication unit 401 to execute a reception process of receiving the connection conditions transmitted by the wireless base station 110.
  • the determining unit 403 determines the wireless base station 110 to which the wireless terminal 120 requests connection, based on the connection conditions received by the receiving unit 402. For example, the wireless terminal 120 preferentially connects to the wireless base station 110 with the lowest connection cost among the wireless base stations 110 that satisfy the required communication quality. Note that when the distance between the wireless terminal 120 and the wireless base station 110 is short, the transmission power can be reduced, and when the communication speed between the wireless base station 110 and the wireless terminal 120 is high, the communication time can be shortened. It is. Therefore, it is preferable that the wireless terminal 120 determines the wireless base station 110 to be connected to based on the communication quality of the wireless base station 110 and the connection cost.
  • the connection control unit 404 executes a connection process to connect to the connection destination wireless base station 110 determined by the determination unit 403. For example, in the connection process described in step S1 of FIG. 15, the connection control unit 404 transmits a connection request to the wireless base station 110 to be connected, and makes an agreement regarding the wireless communication service to be provided.
  • the receiving unit 402, the determining unit 403, the connection control unit 404, and the like are included in a communication control unit 410 that controls wireless communication by the wireless communication unit 401, for example.
  • the storage unit 405 executes storage processing for storing various data, information, programs, etc. necessary for wireless communication, for example, in a storage device included in the wireless terminal 120.
  • FIG. 5 is a flowchart illustrating an example of processing by the wireless base station according to the present embodiment. This process shows the overall flow of the process executed by the wireless base station 110 described in FIG. 3.
  • step S501 the calculation unit 304 of the wireless base station 110 identifies one or more other wireless base stations 110 to which the wireless terminal 120 may transition to its own station (wireless base station 110).
  • the calculation unit 304 uses the ledger information of the blockchain 320 to calculate the normalized congestion degree of one or more other wireless base stations 110 identified in step S501.
  • the normalized degree of congestion is, for example, the number of wireless terminals accommodated by the other wireless base station 110, based on the ratio of the maximum communication quality of the wireless base station 110 to the maximum communication quality of other wireless base stations.
  • the number of wireless terminals that is normalized can be applied.
  • the normalized degree of congestion is calculated based on the ratio of the number of wireless terminals accommodated by the wireless base station 110 and the number of wireless terminals accommodated by the other wireless base stations 110. Communication quality obtained by normalizing communication quality (normalized communication quality) can be applied. Note that the method for calculating the normalized number of wireless terminals and the normalized communication quality will be described later.
  • the changing unit 305 changes the connection condition of its own station (wireless base station 110) based on the normalized degree of congestion calculated by the calculating unit 304. For example, if the own station is more congested than other radio base stations 110, the changing unit 305 increases the connection cost of the own station. Note that when there are multiple other radio base stations 110, the changing unit 305 changes the number of other radio base stations 110 that are more congested than the own station to the number of other radio base stations 110 that are less congested than the own station. If the number of wireless base stations 110 is more than that, it may be determined that the local station is more congested than other wireless base stations 110.
  • the changing unit 305 lowers the connection cost of the own station when the own station is less congested than the other wireless base stations 110. Note that when there are multiple other radio base stations 110, the changing unit 305 changes the number of other radio base stations 110 that are more congested than the own station to the number of other radio base stations 110 that are less congested than the own station. If the number is less, it may be determined that the local station is less congested than other wireless base stations 110.
  • the transmitter 302 uses the wireless communication unit 301 to broadcast the connection conditions.
  • the transmitting unit 302 periodically transmits, by wireless communication, a notification message that includes connection conditions including information such as communication quality of wireless communication provided by the own station (wireless base station 110) and connection cost.
  • step S505 the management unit 303 determines whether the wireless communication unit 301 has received a connection request from the wireless terminal 120, and if it has received a connection request, executes the processes from step S506 onwards.
  • the management unit 303 uses the blockchain 320 to execute, for example, the connection process described in steps S1 to S6 of FIG. 15.
  • step S507 the management unit 303 determines whether a connection contract with the wireless terminal 120 has been established, and if the connection contract has been established, the process moves to step S508. On the other hand, if the connection contract has not been established, the management unit 303 returns the process to step S504.
  • step S508 the wireless base station 110 starts communication with the wireless terminal 120 that sent the connection request, and returns the process to step S504. Furthermore, in step S509, upon completion of communication, the wireless base station 110 returns the process to step S504.
  • calculation unit 304 executes the process of step S510 in parallel with the processes of steps S507 to S511.
  • step S510 the calculation unit 304 determines whether a predetermined time has elapsed since the process 500 of steps S501 to S503 was last executed.
  • the predetermined time is a preset connection cost update interval. If the predetermined time has elapsed, the calculation unit 304 executes the process 500 of steps S501 to S503 again. If the predetermined time has not elapsed, the calculation unit 304 returns the process to step S504 and waits until the predetermined time elapses.
  • the wireless base station 110 can change the connection conditions of the wireless base station 110 based on the normalized congestion degree of other nearby wireless base stations 110. Further, by each of the plurality of radio base stations 110 included in the radio communication system 100 executing the process shown in FIG. 5, it is possible to improve the radio resource usage efficiency of the entire radio communication system 100.
  • FIG. 6 is a flowchart showing the process flow of the wireless terminal according to this embodiment. This process is an example of the process that the wireless terminal 120 described in FIG. 4 executes when starting wireless communication.
  • step S601 the receiving unit 402 receives the connection conditions broadcasted by the wireless base station 110.
  • this connection condition includes information such as the communication quality of wireless communication provided by the wireless base station 110 and the connection cost.
  • the determining unit 403 determines the wireless base station 110 to which the wireless terminal 120 requests connection, based on the connection conditions received by the receiving unit 402. For example, the determining unit 403 may determine the wireless base station 110 with the lowest connection cost among the wireless base stations 110 that satisfy the required communication quality as the wireless base station 110 that requests connection. Furthermore, when there are multiple wireless base stations 110 with the same connection cost, the determining unit 403 may determine the wireless base station 110 with the highest communication quality as the wireless base station 110 requesting connection.
  • step S603 the connection control unit 404 transmits a connection request requesting a wireless communication connection to the wireless base station 110 determined by the determination unit 403.
  • the wireless base station 110 that has received this connection request executes the process of step S506 in FIG. 5.
  • step S604 the connection control unit 404 determines whether a connection contract with the wireless base station 110 has been established, and if the connection contract has been established, the process moves to step S605. On the other hand, if the connection contract has not been established, the wireless terminal 120 ends the process of FIG.
  • step S605 the wireless terminal 120 starts communication with the wireless base station 110 to which it is connected, and in step S606, when the communication is completed, the process in FIG. 6 ends.
  • the wireless terminal 120 can preferentially connect to a wireless base station 110 with a lower connection cost among the nearby wireless base stations 110.
  • the wireless terminal 120 may execute the process in FIG. 6 again and switch the connection destination to a new wireless base station 110. Furthermore, if the connection cost of the wireless base station 110 increases during communication, the wireless terminal 120 may execute the process in FIG. 6 again to switch the connection destination to a new wireless base station 110.
  • connection condition changing process executed by the wireless base station 110 will be described by illustrating a specific example.
  • FIG. 7 is a diagram illustrating an example of the functional configuration of the calculation unit according to the first embodiment.
  • the calculation unit 304 includes, for example, a specification unit 701, an information acquisition unit 702, a normalization unit 703, and the like.
  • the identifying unit 701 executes identifying processing to identify one or more other wireless base stations 110 to which the wireless terminal 120 may transition to the own station (wireless base station 110). For example, the identifying unit 701 acquires transition information of the wireless base station 110 to which the wireless terminal 120 is connected from the blockchain 320, and identifies other wireless base stations 110 to which the wireless terminal 120 has transitioned. do.
  • the identification unit 701 of the wireless base station 110a determines whether there is a history in the blockchain 320 of the wireless terminal 120 connecting to the wireless base station 110a after connecting to the wireless base station 110b. to judge. If there is such a history, the identifying unit 701 of the wireless base station 110a determines the wireless base station 110b as the wireless base station 110 to which the wireless terminal 120 may transfer. By performing similar processing on other radio base stations 110c, 110d, 110e, . , 110c can be specified.
  • the information acquisition unit 702 obtains from the blockchain 320 the maximum communication quality of the other wireless base station 110 identified by the identifying unit 701 and the number of wireless terminals 120 accommodated by the other wireless base station 110 (hereinafter referred to as the number of terminals accommodated). ).
  • the maximum communication quality of the other wireless base station 110 for example, the maximum value of wireless communication throughput provided by the other wireless base station 110 can be applied.
  • the number of terminals accommodated by the other wireless base station 110 is, for example, the number of wireless terminals 120 currently connected to the other wireless base station 110.
  • the normalization unit 703 normalizes the number of terminals accommodated by another wireless base station 110 based on, for example, the ratio of the maximum communication quality of its own station (wireless base station 110) to the maximum communication quality of the other wireless base station 110. Calculate the normalized number of terminals accommodated. For example, the normalization unit 703 calculates the normalized number of terminals accommodated using the following (Formula 1).
  • T my_BS is the maximum communication quality of the own station (wireless base station 110)
  • T shift_BSi is the maximum communication quality of another wireless base station 110
  • U i is the wireless terminal accommodated by the other wireless base station 110. 120 (hereinafter referred to as the number of terminals accommodated).
  • FIG. 8 is a flowchart illustrating an example of connection condition changing processing according to the first embodiment. This process shows a specific example of the process 500 of steps S501 to S503 in FIG. 5, for example.
  • step S801 the identifying unit 701 identifies one or more other wireless base stations 110 to which the wireless terminal 120 may transition to the local station (wireless base station 110).
  • step S802 the information acquisition unit 702 acquires, from the blockchain 320, the maximum communication quality and the number of terminals accommodated by one or more other wireless base stations 110 identified by the identification unit 701.
  • step S803 the normalization unit 703 applies the maximum communication quality and the number of terminals accommodated of the one or more other wireless base stations 110 acquired by the information acquisition unit 702 to (Formula 1), and The normalized number of terminals accommodated by other radio base stations 110 is calculated.
  • the changing unit 305 moves the process to step S805 and increases the connection cost of the local station. On the other hand, if the local station is not congested, the changing unit 305 moves the process to step S806 to reduce the connection cost of the local station.
  • steps S805 and S806 in FIG. 8 is an example.
  • the changing unit 305 may set the connection cost of the own station to a default value in step S806.
  • the changing unit 305 may set the connection cost of the own station to a default value in step S805.
  • FIG. 9 is a diagram illustrating a specific example of connection condition changing processing according to the first embodiment.
  • the "own station” is, for example, the wireless base station 110a in FIG. 1, and the maximum T (maximum throughput) is 100 Mbps and the number of terminals accommodated is 10.
  • BS1 is, for example, the wireless base station 110b of FIG. 1, and the maximum T is 200 Mbps and the number of terminals accommodated is 10.
  • BS2 is, for example, the wireless base station 110c in FIG. 1, has a maximum T of 300 Mbps, and can accommodate 10 terminals.
  • the calculation unit 304 of the local station calculates the maximum T of the local station (an example of maximum communication quality) "100 Mbps", the maximum T of BS1 "200 Mbps", and the number of terminals accommodated by BS1 "10" into (Formula 1). By applying this, the normalized number of terminals accommodated by the BS1 is calculated as "5". Similarly, the calculation unit 304 of the own station calculates the maximum T of the own station (an example of maximum communication quality) "100 Mbps", the maximum T of BS1 "300 Mbps", and the number of terminals accommodated in BS2 "10” using (Formula 1) is applied to calculate the normalized number of terminals accommodated by BS2, which is "3.3".
  • the range of increase/decrease in the connection cost of the own station may be a constant value, or the larger the difference between the normalized number of accommodated terminals between the own station and other wireless base stations (for example, BS1), the greater the range of increase/decrease. It may be set to a large value.
  • the normalized number of accommodated terminals is an example of the normalized degree of congestion calculated by the calculation unit 304.
  • the wireless base station 110 can use the normalized number of terminals accommodated as the normalized degree of congestion.
  • Example 2 (Functional configuration)
  • the functional configuration of the calculation unit 304 according to the second embodiment is similar to the functional configuration of the calculation unit 304 according to the first embodiment shown in FIG. 7, but the processing contents of the information acquisition unit 702 and the normalization unit 703 are different. Since the parts are different, the differences from the first embodiment will be explained here.
  • the information acquisition unit 702 acquires from the blockchain 320 the average communication quality of the other wireless base station 110 identified by the identification unit 701 and the number of wireless terminals 120 accommodated by the other wireless base station 110. .
  • the average communication quality of the other wireless base stations 110 for example, the average value (average T) of wireless communication throughput provided by the other wireless base stations 110 can be applied.
  • the normalization unit 703 normalizes the average communication quality of other wireless base stations 110 based on, for example, the ratio of the number of terminals accommodated in the own station (wireless base station 110) and the number of terminals accommodated in the other wireless base stations 110. Calculate the normalized communication quality. For example, the normalization unit 703 calculates the normalized communication quality using the following (Equation 2).
  • U my_BS is the number of terminals accommodated by the own station (radio base station 110)
  • U shift_BSi is the number of terminals accommodated by other radio base stations 110
  • T i is the average communication quality of the other radio base stations 110.
  • FIG. 10 is a flowchart illustrating an example of connection condition changing processing according to the second embodiment. This process shows a specific example of the process 500 of steps S501 to S503 in FIG. 5, for example. Note that among the processes shown in FIG. 10, the processes in steps S801, S805, and S806 are the same as the processes in the first embodiment described in FIG. 8, so the description thereof will be omitted here.
  • step S1001 the information acquisition unit 702 acquires, from the blockchain 320, the average communication quality and the number of terminals accommodated by one or more other wireless base stations 110 identified by the identification unit 701.
  • step S1002 the normalization unit 703 applies the average communication quality and the number of terminals accommodated of the one or more other wireless base stations 110 acquired by the information acquisition unit 702 to (Equation 2), and The normalized communication quality of other wireless base stations 110 is calculated.
  • the changing unit 305 moves the process to step S805 and increases the connection cost of the local station. On the other hand, if the local station is not congested, the changing unit 305 moves the process to step S806 to reduce the connection cost of the local station.
  • FIG. 11 is a diagram illustrating a specific example of connection condition changing processing according to the second embodiment.
  • the "own station” is, for example, the wireless base station 110a in FIG. 1, and assumes that the average T (average throughput) is 100 Mbps and the number of terminals accommodated is 10.
  • BS1 is, for example, the wireless base station 110b of FIG. 1, and has an average T of 200 Mbps and a terminal capacity of 10.
  • BS2 is, for example, the wireless base station 110c in FIG. 1, has an average T of 300 Mbps, and accommodates 10 terminals.
  • the calculation unit 304 of the own station applies the number of terminals accommodated in the own station "10", the number of terminals accommodated in BS1 "10", and the average T of BS1 "200 Mbps” to (Equation 2), Calculate normalized communication quality (normalized T) "200".
  • the calculation unit 304 of the own station applies the number of terminals accommodated in the own station "10", the number of terminals accommodated in BS2 "10", and the average T of BS2 "300 Mbps" to (Formula 2), The normalized communication quality of "300" is calculated.
  • the range of increase/decrease in the connection cost of the own station may be set to a constant value, or the greater the difference in normalized communication quality between the own station and other wireless base stations (for example, BS1), the larger the range of increase/decrease is set. You may.
  • the normalized communication quality is an example of the normalized degree of congestion calculated by the calculation unit 304.
  • the wireless base station 110 may use normalized communication quality as the normalized degree of congestion.
  • FIG. 12 is a diagram illustrating an example of the hardware configuration of a wireless base station and a wireless terminal according to this embodiment.
  • the wireless base station 110 and the wireless terminal 120 include, for example, the configuration of a computer 1200 as shown in FIG. 12.
  • the computer 1200 includes a processor 1201, a memory 1202, a storage device 1203, a communication device 1204, an input device 1205, an output device 1206, a bus B, and the like.
  • the processor 1201 is, for example, an arithmetic device such as a CPU (Central Processing Unit) that implements various functions by executing a predetermined program.
  • Memory 1202 is a storage medium readable by computer 1200, and includes, for example, RAM (Random Access Memory), ROM (Read Only Memory), and the like.
  • the storage device 1203 is a computer-readable storage medium, and may include, for example, an HDD (Hard Disk Drive), an SSD (Solid State Drive), various optical disks, magneto-optical disks, and the like.
  • the communication device 1204 includes one or more hardware (communication devices) for communicating with other devices via a wireless or wired network.
  • the communication device 1204 of the computer 1200 included in the wireless base station 110 includes a communication device for performing wireless communication and a communication device for performing wired communication.
  • the communication device 1204 of the computer 1200 included in the wireless terminal 120 includes a communication device for performing wireless communication.
  • the input device 1205 is an input device (eg, keyboard, mouse, microphone, switch, button, sensor, etc.) that accepts input from the outside.
  • the output device 1206 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside. Note that the input device 1205 and the output device 1206 may have an integrated configuration (for example, an input/output device such as a touch panel display).
  • Bus B is commonly connected to each of the above components, and transmits, for example, address signals, data signals, and various control signals.
  • the processor 1201 is not limited to a CPU, and may be, for example, a DSP (Digital Signal Processor), a PLD (Programmable Logic Device), or an FPGA (Field Programmable Gate Array).
  • the wireless base station 110 and the wireless terminal 120 in this embodiment are not limited to being implemented by dedicated devices, but may be implemented by a general-purpose computer. In that case, a program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read into a computer system and executed.
  • the "computer system” herein includes hardware such as an OS and peripheral devices.
  • computer-readable recording medium includes various storage devices such as flexible disks, magneto-optical disks, ROMs, CD-ROMs, and other portable media, and hard disks built into computer systems.
  • a “computer-readable recording medium” refers to a storage medium that dynamically stores a program for a short period of time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. It may also include a device that retains a program for a certain period of time, such as a volatile memory inside a computer system that is a server or client in that case.
  • the above-mentioned program may be one for realizing a part of the above-mentioned functions, and further may be one that can realize the above-mentioned functions in combination with a program already recorded in the computer system. It may be realized using hardware such as a PLD (Programmable Logic Device) or an FPGA (Field Programmable Gate Array).
  • PLD Programmable Logic Device
  • FPGA Field Programmable Gate Array
  • a graph 1401 in FIG. 14 shows the simulation results of the throughput cumulative distribution function (CDF) for each wireless terminal 120 in "Example 1", “Comparative Example 1", and “Comparative Example 2". Furthermore, a table 1402 in FIG. 14 shows the median values of throughput of "Example 1", “Comparative Example 1", and "Comparative Example 2".
  • CDF throughput cumulative distribution function
  • Example 1 shows the simulation results when each wireless base station controls the connection cost in a distributed manner using the normalized number of terminals accommodated, as explained in FIGS. 7 to 9. There is.
  • Comparative Example 1 shows the simulation results of a conventional technique in which the connection cost was kept constant without each wireless base station controlling the connection cost.
  • Comparative Example 2 shows the simulation results when each wireless base station controls the connection cost in a distributed manner using the unnormalized number of terminals accommodated.
  • each wireless base station controls the connection cost in a distributed manner using the unnormalized number of terminals accommodated, and as in “Comparative Example 1.” It can be expected that the median throughput will be improved by about 1.6 times compared to the conventional technology. Furthermore, as in “Example 1”, by normalizing the number of terminals accommodated and each wireless base station controlling the connection cost in a distributed manner, the median throughput can be reduced by 1 compared to "Comparative Example 2". .It is expected that the effect will be improved by 4 times.
  • the connection cost of the own station is controlled based on the normalized degree of congestion, so that a decrease in the utilization efficiency of the wireless base station 110 with high communication quality is suppressed, and Communication quality of wireless terminal 120 can be smoothed.
  • the wireless base station a transmission process of broadcasting connection conditions of the wireless base station; a management process that uses a blockchain shared by a plurality of wireless base stations to manage a connection with a wireless terminal that requests connection to the wireless base station based on the connection conditions; a calculation process of calculating the normalized congestion degree of other wireless base stations using the blockchain ledger information; a change process of changing the connection condition of the wireless base station based on the normalized degree of congestion; A wireless communication method that performs (Section 2) The calculation process is Obtaining the maximum communication quality of the other wireless base station and the number of wireless terminals accommodated by the other wireless base station from the blockchain, The normalized number of terminals accommodated by the other radio base station is normalized by the ratio of the maximum communication quality of the radio base station to the maximum communication quality of the other radio base station.
  • the wireless communication method according to item 1. (Section 3) The calculation process is Obtaining from the blockchain the average communication quality of the other wireless base station and the number of wireless terminals accommodated by the other wireless base station, Normalized communication quality obtained by normalizing the average communication quality of the other radio base station by the ratio of the number of radio terminals accommodated by the radio base station and the number of radio terminals accommodated by the other radio base station, The normalized degree of congestion is The wireless communication method according to item 1. (Section 4) The change process is performed according to any one of paragraphs 1 to 3, in which, if the normalized degree of congestion is higher in the other wireless base station than in the wireless base station, the connection cost of the wireless base station is reduced. Wireless communication method described.
  • the change process may include increasing the connection cost of the wireless base station if the normalized congestion level of the other wireless base station is lower than that of the wireless base station.
  • Wireless communication method described. The other radio base station is any one of paragraphs 1 to 3, including one or more radio base stations among the plurality of radio base stations to which a radio terminal may transition to the radio base station.
  • the wireless communication method described in . (Section 7) The wireless communication method according to any one of items 1 to 3, wherein the other wireless base station includes one or more wireless base stations adjacent to or close to the wireless base station.
  • a wireless communication system including a plurality of wireless base stations and a wireless terminal
  • the wireless base station is a transmitting unit that broadcasts connection conditions of the wireless base station; a management unit that manages connection with a wireless terminal that requests connection to the wireless base station based on the connection condition using a blockchain shared by the plurality of wireless base stations; a calculation unit that calculates the normalized congestion degree of other wireless base stations using the blockchain ledger information; a changing unit that changes the connection condition of the wireless base station based on the normalized degree of congestion; has
  • the wireless terminal is a receiving unit that receives the connection conditions; a determining unit that determines the wireless base station to which the wireless terminal requests connection based on the connection condition; has, Wireless communication system.

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Abstract

Dans le but d'améliorer l'efficacité de l'utilisation d'une ressource radio d'un système système de communication sans fil dans son ensemble, la présente invention concerne un procédé de communication sans fil dans lequel une station de base sans fil exécute un processus de transmission permettant de diffuser une condition de connexion de la station de base sans fil, un processus de gestion permettant de gérer des connexions avec des terminaux sans fil qui demandent une connexion à la station de base sans fil sur la base de la condition de connexion, la gestion utilisant une chaîne de blocs partagée par une pluralité de stations de base sans fil, un processus de calcul permettant d'utiliser des informations de registre provenant de la chaîne de blocs pour calculer un niveau de congestion normalisé d'autres stations de base sans fil, et un processus de changement permettant de changer la condition de connexion de la station de base sans fil sur la base du niveau de congestion normalisé.
PCT/JP2022/018407 2022-04-21 2022-04-21 Procédé et système de communication sans fil WO2023203718A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190394648A1 (en) * 2018-06-26 2019-12-26 At&T Intellectual Property I, L.P. Blockchain based wireless access point password management
US20200242603A1 (en) * 2017-12-12 2020-07-30 Apostolis Salkintzis Providing network access using blockchain payments
US20210037013A1 (en) * 2017-11-03 2021-02-04 Lenovo (Singapore) Pte Ltd User authentication using connection information provided by a blockchain network

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210037013A1 (en) * 2017-11-03 2021-02-04 Lenovo (Singapore) Pte Ltd User authentication using connection information provided by a blockchain network
US20200242603A1 (en) * 2017-12-12 2020-07-30 Apostolis Salkintzis Providing network access using blockchain payments
US20190394648A1 (en) * 2018-06-26 2019-12-26 At&T Intellectual Property I, L.P. Blockchain based wireless access point password management

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