JP2012109681A - Wireless communication system, base station and terminal of wireless communication system and wireless communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wireless communication system achieving stable P2P communication and also reducing wasteful power consumption.SOLUTION: A wireless communication system comprised of a plurality of terminals, a base station and an administrative server. The administrative server comprises: a server control unit for associating identification information of the terminal with information concerning content data held by the terminal as first information; and a server communication unit for transmitting the first information to the base station. The base station comprises: a base station control unit for creating second information concerning terminals using the own station to generate terminal information for a predetermined terminal based on the first information and the second information; and a base station communication unit for receiving the first information from the administrative server and also transmitting the terminal information to the predetermined terminal. The predetermined terminal comprises: a terminal control unit for determining another terminal for direct communication based on the terminal information; and a terminal communication unit for receiving the terminal information from the base station and also receiving predetermined content data from the other determined terminal via the direct communication.

Description

  The present invention relates to a wireless communication system that transmits and receives content by P2P (peer-to-peer) communication, a base station and a terminal of the wireless communication system, and a wireless communication method.

  A conventional wireless communication system (Patent Document 1) will be described with reference to FIG. For example, the terminal B transmits a content request to the server SRV via the base station AN and receives predetermined content data from the server SRV. However, the terminal B transmits an anycast request ACR to all the terminals A, C, and D in a certain group, for example, when the download from the server SRV fails in the middle due to factors such as deterioration of the line status. . In response to the anycast request ACR, the terminal A that has already downloaded the predetermined content data transmits a content reply to the terminal B, and transmits the content data to the terminal B by P2P communication.

JP-A-2005-51351

  However, in the conventional wireless communication system, when the anycast request ACR is transmitted to the terminal C connected to the base station AN and performing wireless communication (performing user data communication), the processing load of the terminal C is increased. May increase and delay may occur. Further, when terminal B starts receiving content data by P2P communication from a remote terminal, retransmission may occur frequently due to deterioration in communication quality. Furthermore, the terminal B transmits an anycast request ACR to a terminal D that does not have predetermined data, and further transmits an anycast request ACR even when the terminals A, C, and D exist outside the communicable area. As a result, the power of the terminal B is wasted.

  An object of the present invention made in view of such points is to provide a wireless communication system, a base station and a terminal of a wireless communication system, and a wireless communication method that achieve stable P2P communication and reduce unnecessary power consumption. It is in.

The invention of the wireless communication system according to the first aspect of achieving the above object is as follows:
A wireless communication system comprising a plurality of terminals, a base station that performs wireless communication with the plurality of terminals, and a management server that is connected to the base station and can communicate with the terminals via the base station. And
The management server
A server control unit associating identification information of the plurality of terminals and information on content data held by the plurality of terminals as first information;
A server communication unit for transmitting the first information to the base station;
With
The base station
A base station controller that generates second information about the plurality of terminals using the own station, and generates terminal information for a predetermined terminal based on the first information and the second information;
A base station communication unit that receives the first information from the management server and transmits the terminal information to the predetermined terminal;
With
The predetermined terminal is
Based on the terminal information, a terminal control unit that determines other terminals that communicate directly;
A terminal communication unit that receives the terminal information from the base station and receives predetermined content data from the determined other terminal by direct communication;
Comprising
It is characterized by this.

The invention of the wireless communication system according to the second aspect
The base station control unit
Version information of content data held by the plurality of terminals included in the first information;
The location information of the plurality of terminals and information regarding whether or not the plurality of terminals are in radio communication with the own station, included in the second information;
To set the priority of the other terminal when the predetermined terminal receives the predetermined content data by direct communication from the other terminal, include the priority in the terminal information,
The terminal control unit
Determining to receive the predetermined content data by direct communication from another terminal with the highest priority included in the terminal information;
It is characterized by this.

The invention of the wireless communication system according to the third aspect is
The terminal control unit is
If the predetermined content data cannot be received by direct communication from another terminal with the highest priority, the predetermined content data included in the terminal information is received by direct communication from another terminal with the next highest priority. Decide to do,
It is characterized by this.

The invention of the wireless communication system according to the fourth aspect is
The terminal control unit is
Requesting the terminal information from the base station, and receiving the terminal information from the base station in response to the request;
It is characterized by this.

The invention of the wireless communication system according to the fifth aspect is
When the predetermined terminal moves from the communicable range of one base station to the communicable range of another base station,
The terminal control unit
Request terminal information from the other base station,
The base station controller of the other base station is
Generating terminal information for the predetermined terminal based on the first information and the second information, and transmitting the terminal information to the predetermined terminal as a response to the request;
It is characterized by this.

The invention of the wireless communication system according to the sixth aspect is
The terminal control unit is
When the predetermined content data is requested to the management server via the base station and the predetermined content data cannot be received, the predetermined content data is received by direct communication from the determined other terminal. The terminal communication unit is controlled.

The invention of the base station according to the seventh aspect is
A base of a radio communication system comprising a plurality of terminals, a base station that performs radio communication with the plurality of terminals, and a management server that is connected to the base station and can communicate with the terminals via the base station Station,
Creating second information relating to the plurality of terminals using the own station, first information in which identification information of the plurality of terminals is associated with information relating to content data held by the plurality of terminals; and A base station controller that generates terminal information for a predetermined terminal based on the second information;
A base station communication unit that receives the first information from the management server and transmits the terminal information to the predetermined terminal;
It is characterized by providing.

The invention of the terminal according to the eighth aspect is
A terminal of a wireless communication system comprising a plurality of terminals, a base station that performs wireless communication with the plurality of terminals, and a management server that is connected to the base station and can communicate with the terminals via the base station Because
Generated based on first information in which identification information of the plurality of terminals and information on content data held by the plurality of terminals are associated with each other, and second information on the plurality of terminals using the own station A terminal control unit that determines other terminals to communicate directly based on the terminal information for the given terminal,
A terminal communication unit that receives the terminal information from the base station and receives predetermined content data from the determined other terminal by direct communication;
It is characterized by providing.

The invention of the wireless communication method according to the ninth aspect is
Radio of a radio communication system comprising a plurality of terminals, a base station that performs radio communication with the plurality of terminals, and a management server that is connected to the base station and can communicate with the terminals via the base station A communication method,
The management server
The identification information of the plurality of terminals and the information on the content data held by the plurality of terminals are associated as first information,
Transmitting the first information to the base station;
The base station
Receiving the first information from the management server;
Creating second information about the plurality of terminals using the own station;
Generating terminal information for a predetermined terminal based on the first information and the second information;
Transmitting the terminal information to the predetermined terminal;
The predetermined terminal is
Receiving the terminal information from the base station;
Based on the terminal information, determine other terminals to communicate directly,
Receiving predetermined content data by direct communication from the determined other terminal;
It is characterized by this.

  According to the present invention, it is possible to provide a wireless communication system, a base station and a terminal of a wireless communication system, and a wireless communication method that achieve stable P2P communication and reduce wasteful power consumption.

1 is a schematic configuration diagram of a radio communication system according to a first embodiment of the present invention. It is a functional block diagram of the radio | wireless communications system which concerns on 1st Embodiment of this invention. It is a figure which shows an example of 1st information. It is a figure which shows an example of 2nd information. It is a sequence diagram of the radio | wireless communications system which concerns on 1st Embodiment of this invention. It is a figure which shows an example of terminal information. It is a schematic block diagram of the radio | wireless communications system which concerns on 2nd Embodiment of this invention. It is a sequence diagram of the radio | wireless communications system which concerns on 2nd Embodiment of this invention. It is a schematic block diagram of the radio | wireless communications system which concerns on 3rd Embodiment of this invention. It is a figure which shows an example of 2nd information. It is a sequence diagram of the radio | wireless communications system which concerns on 3rd Embodiment of this invention. It is a figure which shows an example of 1st information. It is a figure which shows an example of terminal information. It is a sequence diagram of the radio | wireless communications system which concerns on 4th Embodiment of this invention. It is a schematic block diagram of the conventional radio | wireless communications system.

  Hereinafter, embodiments of a wireless communication system according to the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a schematic configuration diagram of a radio communication system according to the first embodiment of the present invention. The wireless communication system 100 according to the first embodiment includes a plurality of terminals 10A to 10D, a management server 20, and a base station 30. Terminals 10A to 10D are wireless communication terminals such as mobile phones and PHS. The terminals 10A to 10D existing within the communicable range of the base station 30 use the control channel to transmit the position information and connection information (information regarding whether each terminal is in radio communication with the base station 30) to the base station 30. Send to. Here, it is assumed that the terminal 10C is connected to the base station 30 and is performing wireless communication. The management server 20 is connected to the base station 30 via the network NET, and communicates with the terminals 10A to 10D via the base station 30. The base station 30 is called eNB (evolved Node B) in the LTE (Long Term Evolution) system and AN (Access Network) in the HRPD (High Rate Packet Data) system. -10D and wireless communication.

  FIG. 2 is a functional block diagram of the wireless communication system according to the first embodiment of the present invention. Description will be made using an arbitrary terminal 10 among the terminals 10A to 10D. The terminal 10 includes an antenna ANT, a terminal communication unit 11, a terminal control unit 12, and a terminal storage unit 13. The terminal communication unit 11 transmits and receives radio signals to and from the base station 30 via the antenna ANT. For example, the terminal communication unit 11 transmits position information and connection information to the base station 30 using the control channel. In addition, the terminal communication unit 11 transmits a content request to the management server 20 via the base station 30 and receives content data from the management server 20. Further, the terminal communication unit 11 receives content data from other terminals by direct communication. The terminal control unit 12 controls and manages the entire terminal 10 including each functional block of the terminal 10. The terminal control unit 12 is configured by a CPU (Central Processing Unit) and the like. The terminal storage unit 13 stores content data received from the management server 20. The terminal storage unit 13 is configured by a storage medium such as a hard disk or a flash memory.

  The management server 20 includes a server communication unit 21, a server control unit 22, and a server storage unit 23. The server communication unit 21 transmits and receives signals to and from the base station 30 via the network NET. Specifically, the server communication unit 21 transmits first information described later to the base station 30. The server communication unit 21 receives a content request from the terminal 10 via the base station 30 and transmits content data to the terminal 10 in response thereto. The server control unit 22 associates the identification information (terminal ID) of the terminal 10 and the content information held by the terminal 10 as first information, and generates a table shown in FIG. The content information is version information of content data held by the terminal 10. In the case of FIG. 3A, the terminals 10A, 10B, and 10D hold version 1 (ver. 1) content data, and the terminal 10C holds version 2 (ver. 2) content data. In addition, the server control unit 22 controls and manages the entire management server 20 including each functional block of the management server 20. The server control unit 22 is configured by a CPU (Central Processing Unit) and the like. The server storage unit 23 stores content data and first information. The server storage unit 23 is configured by a storage medium such as a hard disk or a flash memory.

  The base station 30 includes an antenna ANT, a base station communication unit 31, a base station control unit 32, and a base station storage unit 33. The base station communication unit 31 includes a wired communication unit 31a and a wireless communication unit 31b. The wired communication unit 31a transmits and receives signals to and from the management server 20 via the network NET. For example, the wired communication unit 31 a receives the first information from the management server 20. The radio communication unit 31b transmits and receives radio signals to and from the terminal 10 via the antenna ANT. For example, the wireless communication unit 31b receives position information and connection information transmitted from the terminal 10 using the control channel. In addition, the wireless communication unit 31b transmits terminal information to be described later to the terminal 10.

  The base station control unit 32 creates second information regarding the terminal 10 that uses the local station. Specifically, as shown in FIG. 4, the second information is obtained by associating identification information (terminal ID) of the terminal 10 with position information and connection information of the terminal 10. The position information is information indicating where the terminal 10 is located with reference to the base station 30. . W. . Is south of the base station 30 as a reference. . m, west. . It is present that it exists at a position separated by m. The connection information is information indicating whether or not the terminal 10 is connected to the base station 30 and is performing wireless communication. 4 that the terminals 10A, 10B, and 10D are not connected to the base station, and the terminal 10C is connected to the base station 30 and performing wireless communication. In addition, the base station control unit 32 controls and manages the entire base station 30 including each functional block of the base station 30. The base station control unit 32 is configured by a CPU (Central Processing Unit) and the like. The base station storage unit 33 stores the second information. The base station storage unit 33 is configured by a storage medium such as a hard disk or a flash memory.

  FIG. 5 is a sequence diagram of the radio communication system according to the first embodiment of the present invention. ver. Terminal 10B (predetermined terminal) having the content data of 1 is transmitted from another terminal by the P2P communication (direct communication) to the ver. The flow of receiving content data 2 will be described. The management server 20 has the first information shown in FIG. First, as a previous step, the terminal 10A ver. The flow of receiving the content data 2 from the management server 20 will be described. The terminal 10A transmits a content request to the management server 20 via the base station 30, and ver. 2 content data is requested (S101). In response to this, the management server 20 transmits content data (ver. 2) to the terminal 10A via the base station 30 (S102).

  The management server 20 updates the first information, triggered by the transmission of content data to the terminal 10A (S103). Since the management server 20 has transmitted the content data (ver. 2) to the terminal 10A, the first information is the content information held by the terminal 10A as shown in FIG. 2. Then, the management server 20 transmits the updated first information to the base station 30 (S104).

  The base station 30 generates terminal information for the terminal 10B based on the received first information and the second information that the base station 30 has (S105). Specifically, the base station 30 generates terminal information for the terminal 10B illustrated in FIG. 6 based on the first information illustrated in FIG. 3B and the second information illustrated in FIG. In FIG. 6, the distance is a distance between the terminal 10B and each of the terminals 10A, 10C, and 10D. ver. P2P communication priority 1 (the highest P2P communication priority) is set for the terminal 10A that is a terminal that is not connected to the base station 30 and has a short distance among the terminals 10A and 10C having the content data of 2. P2P communication priority 2 (P2P communication priority is the next highest) is set for terminal 10C. The terminal 10D ver. Since the content data of 2 is not included, it is recognized that P2P communication is impossible. In addition, although the example which produces | generates the terminal information for terminal 10B was demonstrated, the base station 30 is also producing | generating the terminal information for terminals 10A, 10C, and 10D simultaneously.

  The terminal 10B transmits a P2P capable terminal information request to the base station 30 in order to request terminal information for the terminal 10B (S106). In response to this, the base station 30 transmits to the terminal 10B information on the terminals 10A and 10C in order of priority as P2P capable terminal information based on the P2P communication priority included in the terminal information of FIG. 6 (S107). Then, the terminal 10B transmits a content request to the terminal 10A having the highest priority by P2P communication (S108). In response to this, the terminal 10A transmits content data (ver. 2) to the terminal 10B by P2P communication (S109). Upon receiving the content data (ver. 2), the terminal 10B transmits a first information update request to the management server 20 via the base station 30 (S110). In response to this, the management server 20 updates the first information (S111). Specifically, as shown in FIG. 3C, the first information is that the content information held by the terminal 10B is ver. 2.

  Note that the terminal 10B transmits a P2P capable terminal information request to the base station 30 in order to request terminal information for the terminal 10B (S106), and receives the P2P capable terminal information included in the terminal information (S107). However, the terminal information itself can also be received from the base station 30. In this case, the terminal 10B determines to receive content data (ver. 2) by P2P communication from the terminal 10A having the highest P2P communication priority included in the received terminal information. Further, although the P2P communication priority is determined based on the distance, the connection information, and the content information, other information can be added. Also, the priority of distance or connection information can be set as appropriate.

  As described above, according to the first embodiment, the optimum terminal for P2P communication is determined in consideration of the positional relationship between the terminal that transmits the predetermined content by the P2P communication and the terminal that receives the content, and the communication status of the terminal that transmits the content. By determining, stable P2P communication can be achieved and wasteful power consumption can be reduced. Further, when there is no P2P communicable terminal, since no P2P capable terminal information is transmitted in S107, useless power consumption can be reduced.

(Second Embodiment)
In the second embodiment, a case where a terminal having the highest P2P communication priority moves will be described. FIG. 7 is a schematic configuration diagram of a radio communication system according to the second embodiment of the present invention. The wireless communication system 200 according to the second embodiment includes the same components as the wireless communication system 100 according to the first embodiment, and each component of the wireless communication system 200 according to the second embodiment is the same as that of the first embodiment. Since it is the same as that of the radio | wireless communications system 100 which concerns, the description is abbreviate | omitted. Initially, the terminals 10A, 10C, and 10D exist within the P2P communication range of the terminal 10B, and the base station 30 generates terminal information with P2P communication priority 1 for the terminal 10A. It is assumed that the user has moved out of the P2P communication range. The terminal 10C is connected to the base station 30 and is performing wireless communication. The base station 30 receives position information and connection information from each terminal using a control channel, and has second information shown in FIG.

  FIG. 8 is a sequence diagram of a radio communication system according to the second embodiment of the present invention. ver. Terminal 10B having content data of 1 is transmitted from another terminal to ver. The flow of receiving content data 2 will be described. Although illustration is omitted, terminal 10A is connected to ver. It is assumed that the second content data has been received from the management server 20. The management server 20 updates the first information with the content data transmitted to the terminal 10A as a trigger (S201). The updated first information is as shown in FIG. Then, the management server 20 transmits the updated first information to the base station 30 (S202).

  The base station 30 generates terminal information for the terminal 10B based on the received first information and the second information that the base station 30 has (S203). Specifically, the base station 30 generates terminal information for the terminal 10B illustrated in FIG. 6 based on the first information illustrated in FIG. 3B and the second information illustrated in FIG. Next, the terminal 10B transmits a P2P capable terminal information request to the base station 30 (S204). In response to this, the base station 30 transmits the information of the terminals 10A and 10C in the order of priority as the P2P capable terminal information to the terminal 10B based on the P2P communication priority in FIG. 6 (S205). Then, the terminal 10B transmits a content request to the terminal 10A with high priority by P2P communication (S206). However, since the base station 30 has generated the terminal information having the P2P communication priority 1 for the terminal 10A and has moved out of the P2P communicable area of the terminal 10B, the terminal 10A starts P2P communication with the terminal 10B. Can not. Therefore, the terminal 10B transmits a content request to the terminal 10C with the next highest priority by P2P communication (S207). In response to this, the terminal 10C transmits content data (ver. 2) to the terminal 10B by P2P communication (S208). When receiving the content data (ver. 2), the terminal 10B transmits a first information update request to the management server 20 via the base station 30 (S209). In response to this, the management server 20 updates the first information as shown in FIG. 3C (S210).

  As described above, according to the second embodiment, by setting priorities of a plurality of terminals having predetermined contents and capable of P2P communication, the terminal having the highest priority moves out of the P2P communicable area. However, P2P communication can be performed with a terminal having the next highest priority.

(Third embodiment)
In the third embodiment, a case where a predetermined terminal that receives content data by P2P communication moves will be described. FIG. 9 is a schematic configuration diagram of a radio communication system according to the third embodiment of the present invention. The wireless communication system 300 according to the third embodiment includes two base stations 30P and a base station 30Q. First, the terminals 10A to 10D exist in the communicable range of the base station 30P, and the terminal 10E exists in the communicable range of the base station 30Q, but after the terminal 10B receives the P2P capable terminal information from the base station 30P Assume that the mobile station moves outside the communicable area of the base station 30P and within the communicable area of the base station 30Q. The terminal 10C is connected to the base station 30P and is performing wireless communication. The base station 30P and the base station 30Q receive position information and connection information from each terminal using the control channel. Before the terminal 10B moves, the base station 30P has the second information shown in FIG. 30Q has the second information shown in FIG. Since each component of the wireless communication system 300 according to the third embodiment is the same as that of the wireless communication system 100 according to the first embodiment, description thereof is omitted.

  FIG. 11 is a sequence diagram of a radio communication system according to the third embodiment of the present invention. ver. Terminal 10B having content data of 1 is transmitted from another terminal to ver. The flow of receiving content data 2 will be described. Although illustration is omitted, terminal 10A is connected to ver. 2 is received from the management server 20 via the base station 30P, and the terminal 10E ver. 2 is received from the management server 20 via the base station 30Q. The management server 20 updates the first information using the transmission of content data to the terminal 10A and the terminal 10E as a trigger (S301). The updated first information is as shown in FIG. Then, the management server 20 transmits the updated first information to the base station 30P and the base station 30Q (S302, S303).

  The base station 30P generates terminal information for the terminal 10B based on the received first information and the second information included in the base station 30P (S304). Specifically, the base station 30P generates terminal information for the terminal 10B illustrated in FIG. 6 based on the first information illustrated in FIG. 12A and the second information illustrated in FIG. Similarly, base station 30Q produces | generates terminal information for every terminal based on the received 1st information and 2nd information which base station 30Q has (S305). At this time, since the terminal 10B exists outside the communicable area of the base station 30Q, the base station 30Q does not generate terminal information for the terminal 10B.

  The terminal 10B transmits a P2P capable terminal information request to the base station 30P (S306). In response to this, the base station 30P transmits the information of the terminals 10A and 10C in the order of priority as the P2P capable terminal information to the terminal 10B based on the P2P communication priority in FIG. 6 (S307). Next, the terminal 10B moves outside the communicable range of the base station 30P and within the communicable range of the base station 30Q. Since the base station to be used is changed, the terminal 10B transmits the position information and the connection information to the newly used base station 30Q using the control channel. Then, the base station 30Q updates the second information. The updated second information is as shown in FIG. Then, the base station 30Q generates terminal information for the terminal 10B illustrated in FIG. 13 based on the first information received in S303 and the updated second information illustrated in FIG. S308).

  Since the terminal 10B has moved within the communicable range of the base station 30Q, the terminal 10B transmits a P2P capable terminal information request to the base station 30Q (S309). In response to this, the base station 30Q transmits the terminal 10E to the terminal 10B as P2P capable terminal information based on the P2P communication priority included in the terminal information of FIG. 13 (S310). Then, the terminal 10B transmits a content request to the terminal 10E by P2P communication (S311). In response to this, the terminal 10E transmits content data (ver. 2) to the terminal 10B by P2P communication (S312). When receiving the content data (ver. 2), the terminal 10B transmits a first information update request to the management server 20 via the base station 30Q (S313). In response to this, the management server 20 updates the first information as shown in FIG. 12B (S314).

  In the above-described embodiment, the base station 30Q receives the first information from the management server 20 (S303), generates terminal information (S305), and uses the control channel from the terminal 10B. The terminal information is generated by receiving the position information and the connection information (S308). However, the base station 30Q can also generate terminal information for the terminal 10B triggered by the reception of the P2P capable terminal information request from the terminal 10B (S309).

  As described above, according to the third embodiment, a plurality of base stations create terminal information of a terminal that uses the own station, so that a terminal that receives predetermined content moves and uses the base station. Even if it is changed, P2P communication with the optimum terminal can be performed.

(Fourth embodiment)
In the fourth embodiment, a case will be described in which content data is received from another terminal by P2P communication after a predetermined terminal fails to receive content data from the management server. Since the schematic configuration diagram and each component of the wireless communication system according to the fourth embodiment are the same as those of the wireless communication system 100 according to the first embodiment, description thereof will be omitted. The terminal 10C is connected to the base station 30 and is performing wireless communication. The base station 30 receives position information and connection information from each terminal using a control channel, and has second information shown in FIG.

  FIG. 14 is a sequence diagram of a radio communication system according to the fourth embodiment of the present invention. ver. Terminal 10B having content data of 1 is transmitted from another terminal to ver. The flow of receiving content data 2 will be described. Although illustration is omitted, terminal 10A is connected to ver. It is assumed that the second content data has been received from the management server 20. The management server 20 updates the first information with the content data transmitted to the terminal 10A as a trigger (S401). The updated first information is as shown in FIG. Then, the management server 20 transmits the updated first information to the base station 30 (S402).

  The base station 30 generates terminal information for the terminal 10B based on the received first information and the second information that the base station 30 has (S403). Specifically, the base station 30 generates terminal information for the terminal 10B illustrated in FIG. 6 based on the first information illustrated in FIG. 3B and the second information illustrated in FIG. Next, the terminal 10B transmits a P2P capable terminal information request to the base station 30 (S404). In response to this, the base station 30 transmits to the terminal 10B information on the terminals 10A and 10C in order of priority as P2P capable terminal information based on the P2P communication priority included in the terminal information of FIG. 6 (S405). The terminal 10B transmits a content request to the management server 20 via the base station 30 (S406). In response to this, the management server 20 transmits the content data (ver. 2) to the terminal 10B via the base station 30, but the terminal 10B cannot receive the content data due to some trouble (S407). As described above, when the terminal 10B cannot receive the content data from the management server 20, the terminal 10B transmits a content request to the terminal 10A having the highest priority by P2P communication based on the P2P capable terminal information received in S405 (S408). ). In response to this, the terminal 10A transmits the content data (ver. 2) to the terminal 10B by P2P communication (S409). Upon receiving the content data (ver. 2), the terminal 10B transmits a first information update request to the management server 20 via the base station 30 (S410). In response to this, the management server 20 updates the first information as shown in FIG. 3C (S411).

  As described above, according to the fourth embodiment, the terminal 10B has received the P2P capable terminal information in S404 and S405 in advance, so that even if a failure occurs in communication with the base station 30 thereafter. , P2P communication can be performed with the terminal 10A or the terminal 10C, and predetermined content can be received.

  It should be understood that the present invention is not limited to the above-described embodiments, and various modifications are possible. For example, in the embodiment described above, the management server updates the first information triggered by the transmission of content data to the terminal or the reception of the first information update request from the terminal. Can also update the first information periodically. In addition, the base station generates terminal information for each terminal based on the first information and the second information, but for a terminal that has no history of connection with the base station for a certain period of time, a memory is used to hold a database. It can be deleted from the database in consideration of the amount and processing efficiency.

10 terminal 11 terminal communication unit 12 terminal control unit 13 terminal storage unit 20 management server 21 server communication unit 22 server control unit 23 server storage unit 30 base station 31 base station communication unit 32 base station control unit 33 base station storage unit 100 wireless communication System 200 wireless communication system 300 wireless communication system

Claims (9)

A wireless communication system comprising a plurality of terminals, a base station that performs wireless communication with the plurality of terminals, and a management server that is connected to the base station and can communicate with the terminals via the base station. And
The management server
A server control unit associating identification information of the plurality of terminals and information on content data held by the plurality of terminals as first information;
A server communication unit for transmitting the first information to the base station;
With
The base station
A base station controller that generates second information about the plurality of terminals using the own station, and generates terminal information for a predetermined terminal based on the first information and the second information;
A base station communication unit that receives the first information from the management server and transmits the terminal information to the predetermined terminal;
With
The predetermined terminal is:
Based on the terminal information, a terminal control unit that determines other terminals that communicate directly;
A terminal communication unit that receives the terminal information from the base station and receives predetermined content data from the determined other terminal by direct communication;
Comprising
A wireless communication system. The base station controller
Version information of content data held by the plurality of terminals included in the first information;
The location information of the plurality of terminals and information regarding whether or not the plurality of terminals are in radio communication with the own station, included in the second information;
To set the priority of the other terminal when the predetermined terminal receives the predetermined content data by direct communication from the other terminal, include the priority in the terminal information,
The terminal control unit
Determining to receive the predetermined content data by direct communication from another terminal with the highest priority included in the terminal information;
The wireless communication system according to claim 1. The terminal control unit
If the predetermined content data cannot be received by direct communication from another terminal with the highest priority, the predetermined content data included in the terminal information is received by direct communication from another terminal with the next highest priority. Decide to do,
The wireless communication system according to claim 2. The terminal control unit
Requesting the terminal information from the base station, and receiving the terminal information from the base station in response to the request;
The wireless communication system according to claim 1, wherein the wireless communication system is a wireless communication system. When the predetermined terminal moves from the communicable range of one base station to the communicable range of another base station,
The terminal control unit
Request terminal information from the other base station,
The base station controller of the other base station is
Generating terminal information for the predetermined terminal based on the first information and the second information, and transmitting the terminal information to the predetermined terminal as a response to the request;
The radio | wireless communications system as described in any one of Claims 1-4 characterized by the above-mentioned. The terminal control unit
When the predetermined content data is requested to the management server via the base station and the predetermined content data cannot be received, the predetermined content data is received by direct communication from the determined other terminal. The wireless communication system according to any one of claims 1 to 4, wherein the terminal communication unit is controlled. A base of a radio communication system comprising a plurality of terminals, a base station that performs radio communication with the plurality of terminals, and a management server that is connected to the base station and can communicate with the terminals via the base station Station,
Creating second information relating to the plurality of terminals using the own station, first information in which identification information of the plurality of terminals is associated with information relating to content data held by the plurality of terminals; and A base station controller that generates terminal information for a predetermined terminal based on the second information;
A base station communication unit that receives the first information from the management server and transmits the terminal information to the predetermined terminal;
A base station comprising: A terminal of a wireless communication system comprising a plurality of terminals, a base station that performs wireless communication with the plurality of terminals, and a management server that is connected to the base station and can communicate with the terminals via the base station Because
Generated based on first information in which identification information of the plurality of terminals and information on content data held by the plurality of terminals are associated with each other, and second information on the plurality of terminals using the own station A terminal control unit that determines other terminals to communicate directly based on the terminal information for the given terminal,
A terminal communication unit that receives the terminal information from the base station and receives predetermined content data from the determined other terminal by direct communication;
A terminal comprising: Radio of a radio communication system comprising a plurality of terminals, a base station that performs radio communication with the plurality of terminals, and a management server that is connected to the base station and can communicate with the terminals via the base station A communication method,
The management server
The identification information of the plurality of terminals and the information on the content data held by the plurality of terminals are associated as first information,
Transmitting the first information to the base station;
The base station
Receiving the first information from the management server;
Creating second information about the plurality of terminals using the own station;
Generating terminal information for a predetermined terminal based on the first information and the second information;
Transmitting the terminal information to the predetermined terminal;
The predetermined terminal is
Receiving the terminal information from the base station;
Based on the terminal information, determine other terminals to communicate directly,
Receiving predetermined content data by direct communication from the determined other terminal;
A wireless communication method.

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