JP2007081884A - Switch unit and communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To generate regional information of a mobile unit from an IP packet received from the mobile unit in wireless IP communication. <P>SOLUTION: In the wireless IP communication; a switch unit manages information on the relationship of correspondence between a path identifier of a line connecting a radio station to the switch unit and the regional information of the radio station, the mobile unit originates an IP packet to the switch unit via the radio station, the switch unit identifies the path identifier of the line connecting the radio station to the switch unit from the IP packet, and the switch unit generates the regional information of the mobile unit from the path identifier identified in a packet analysis portion based on the information on the relationship of correspondence. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an exchange and a communication system for generating region information of a mobile device from an IP packet received from the mobile device in wireless IP communication.

  In a telephone network that interconnects a plurality of telecommunications carriers, it is obliged to specify the position of the terminal on the calling side regardless of whether it is mobile communication or fixed communication. In the conventional mobile communication network (see FIG. 1), the area information of the mobile device specifies the location of the terminal on the transmission side by managing the installation location of the radio station with the exchange. Specifically, a correspondence table between the area identifier and area information for each radio station is registered in advance in the exchange. At the time of transmission from the mobile device, the area identifier of the radio station to which the mobile device belongs is transmitted to the exchange. In the exchange, the area identifier from the radio station is searched from the correspondence table to generate area information.

On the other hand, fixed IP telephones employing the SIP (Session Initiation Protocol) protocol are becoming popular. When such an IP telephone is applied to the mobile communication as described above, the concept of regional information does not exist in the IP communication, and the following problem occurs (Non-patent Document 1).
・ Cannot associate the mobile phone number with regional information.
-Since the mobility of the mobile device is secured, the IP address of the terminal cannot be associated with the regional information.

  As a technique for generating regional information of a transmitting terminal in IP communication, there is a technique for requesting registration of terminal location information when a user terminal is connected, as in Patent Document 1. However, this technique relies on the input of location information by the user, and is insufficient as regional information necessary for interconnection with other business networks, for example.

Further, as disclosed in Patent Document 2, there is a technique for managing terminal location information using an SSID and preventing terminal impersonation. However, since the SSID can also be changed by the user, it is insufficient as regional information in an environment where a plurality of operators are interconnected.
JP 2004-328104 A JP 2004-274602 A JF-IETF-RFC 3398, Technical Specification for SIP-TTC ISUP Signaling Interconnection, Version 1.0, June 2, 2005

  The present invention has been made in view of the above-described prior art, and an object of the present invention is to generate regional information of a mobile device from an IP packet received from the mobile device in wireless IP communication.

  The object of the present invention is an exchange for generating region information of a mobile device from an IP packet received from the mobile device via a wireless station in wireless IP communication, and a line connecting the wireless station and the exchange A correspondence relation management unit that manages correspondence relation information between the path identifier of the wireless station and the area information of the wireless station, receives an IP packet from the mobile station, and connects the wireless station and the exchange from the IP packet A packet analysis unit that identifies a path identifier of a line; and an exchange that includes a region information generation unit that generates region information of the mobile device based on the correspondence information from the path identifier specified by the packet analysis unit. Can be solved.

  The correspondence management unit manages correspondence information of the path identifier, area information of the wireless station, and a unique number of the wireless station, and the correspondence management unit authenticates the mobile device at a certificate authority. The radio station unique number and the mobile station terminal identifier are further managed by the correspondence information, and the packet analysis unit further identifies the mobile station terminal identifier from the IP packet. The area information generation unit may generate area information of the mobile device based on the correspondence information from the terminal identifier and the path identifier specified by the packet analysis unit.

  The object of the present invention is a wireless IP communication system having a mobile station, a radio station, and an exchange that receives an IP packet from the mobile station via the radio station. Managing the correspondence information between the path identifier of the line connecting the radio station and the exchange and the area information of the radio station, the mobile station transmits an IP packet to the exchange via the radio station, The switch specifies a path identifier of a line connecting the radio station and the switch from the IP packet, and the switch uses the path identifier specified by the packet analyzer based on the correspondence information. The problem can also be solved by a wireless IP communication system that generates area information of a mobile device.

  As described above, according to the embodiment of the present invention, it is possible to generate region information of a mobile device from an IP packet received from the mobile device in wireless IP communication.

  Embodiments of the present invention will be described in detail below with reference to the drawings.

(First embodiment)
FIG. 2 is a diagram showing a configuration example of the wireless IP telephone system 10 to which the first embodiment of the present invention is applied. The wireless IP telephone system 10 includes a mobile device 101, a wireless station 103, an exchange 105, and a SIP server 109. The radio station 103 and the exchange 105 are connected by an access line 111. The mobile device 101 has a function of making an IP phone call according to the SIP protocol. The radio station 103 connects a call from the mobile device 101 to the exchange 105 installed in the communication carrier. The SIP server 109 is installed in the exchange or connected to the exchange, and establishes a communication session in response to a SIP access request from the mobile device 101. The exchange 105 connects the IP phone of the mobile device 101 to its own operator network or another operator network.

  The exchange 105 has a correspondence table 107 that associates the path identifier of the access line 111 with the area information. The correspondence table 107 is set as shown in FIG. 3 when the access line between the wireless station 103 and the exchange 105 is set. The correspondence table 107 is a table for managing regional information for each path identifier of the access line 111. For example, when a VPN (Virtual Private Network) is set between the site # 1 and the exchange 105, the path identifier is a VPN number uniquely assigned to each VPN. In this way, regional information for each base is registered in the correspondence table 107 in advance. When the exchange 105 connects the IP phone of the mobile device 101 to another carrier network or the like, since the regional information of the mobile device 101 is necessary, the exchange 105 refers to the correspondence table 107 and the regional information of the mobile device 101. Is generated. The generation of this regional information will be described in detail below.

  FIG. 4 is a block diagram of the exchange 105 in the first embodiment of the present invention. The exchange 105 includes a correspondence management unit 151, a correspondence table 153, a reception unit 155, a packet analysis unit 157, and a region information generation unit 159. The correspondence relationship management unit 151 associates the path identifier of the access line with the area information, and stores the correspondence relationship information in the correspondence table 153. The correspondence table 153 corresponds to the correspondence table 107 in FIG. 2 and holds correspondence information as shown in FIG. The receiving unit 155 receives an IP packet from a mobile device via a wireless station. Since this IP packet includes the path identifier of the access line, the packet analyzer 157 identifies the path identifier. The area information generation unit 159 searches the correspondence table for the path identifier specified by the packet analysis unit 157, and specifies the area information of the wireless station. The area information of the mobile station is generated by using the area information of the wireless station as the area information of the mobile station.

  The regional information generated in this way can be used for charging information for the mobile device. Also, routing to the optimal POI can be performed based on the regional information. For example, it is possible to route a telephone call transmitted from an important site to a POI having a backup line. Furthermore, it becomes possible to transmit information specialized for the region from the exchange to the mobile device based on the region information.

(Second embodiment)
FIG. 5 is a diagram showing a configuration example of the wireless IP telephone system 20 to which the second embodiment of the present invention is applied. The wireless IP telephone system 20 includes a mobile device 201, a wireless station 203, an exchange 205, and a SIP server 209, as in the first embodiment. Further, the wireless IP telephone system 20 has a certificate authority 213. The certificate authority 213 may be a RADIUS server, for example. The mobile device 201 establishes a communication session with the SIP server 209 and further authenticates the certificate authority 213.

  The exchange 205 has a correspondence table 207 that associates a unique number (for example, a MAC address) of a wireless station with regional information. The correspondence table 207 is set in advance as shown in FIG. 6 by associating the unique number of the wireless station and the area information (at this time, no information on the mobile device is entered). For example, when the wireless station # 1 is installed at the base # 1, the MAC address of the wireless station # 1 and the area information of the wireless station # 1 are registered in the correspondence table 207. As described above, at the time of outgoing call, the mobile device 201 establishes a communication session with the SIP server 209 and authenticates to the certificate authority 213. At the time of establishing the communication session, the SIP server 209 assigns a SIP-URI (Session Initiation Protocol—Uniform Resource Identifier) to the mobile device 201. Since the SIP-URI is included in the packet header from the mobile device, the certificate authority 213 can transmit this information to the switch 205 at the time of authentication. That is, the certificate authority 213 transmits the SIP-URI and the MAC address of the wireless station to the exchange 205. The exchange 205 searches the correspondence table 207 based on the received MAC address of the wireless station, and registers the received SIP-URI as a terminal identifier of the mobile device 201 in a corresponding part of the correspondence table 207. At the time of connection from the mobile device 201 to the switch 205, the switch 205 generates region information of the mobile device from the SIP-URI included in the IP packet. The generation of this regional information will be described in detail below.

  The block diagram of the exchange 205 in the second embodiment is the same as FIG. The correspondence management unit 151 associates the unique number of the wireless station with the area information in advance, and stores the correspondence information in the correspondence table 153. The correspondence table 153 corresponds to the correspondence table 207 in FIG. 5 and holds correspondence information as shown in FIG. 6 (at this time, information on “region” and “wireless station” is written). The receiving unit 155 receives the unique number of the wireless station and the terminal identifier of the mobile device from the authentication station when the mobile device is authenticated. The unique number of the wireless station and the terminal identifier of the mobile station received by the receiving unit 155 are registered in the correspondence table 153 via the correspondence management unit 151, and correspondence information as shown in FIG. 6 is generated. At the time of transmission from the mobile device, the receiving unit 155 receives an IP packet from the mobile device via the wireless station. Since this IP packet includes the terminal identifier of the mobile device, the packet analyzer 157 identifies the terminal identifier. The area information generation unit 159 searches the correspondence table for the terminal identifier specified by the packet analysis unit 157 and specifies the area information of the wireless station. The area information of the mobile station is generated by using the area information of the wireless station as the area information of the mobile station.

  The area information generated in this way can be used for billing information, routing to the optimal POI, and area-specific information transmission, as in the first embodiment.

  In the second embodiment described above, the certificate authority is installed at each site. However, the certificate authority may be installed in connection with an exchange (provider side) so as to manage a plurality of sites in an integrated manner.

(Combination of the first and second embodiments)
The first embodiment described above has a feature that the area of the base can be accurately specified using the path identifier. In addition, since the correspondence table is not updated for each communication session, the load on the exchange can be reduced.

  On the other hand, the second embodiment has a feature that the area information can be specified even when the mobile device moves because the area information can be confirmed for each communication session. In addition, it is characterized in that communication other than the permitted mobile device can be disconnected by performing authentication with the certificate authority before connecting the communication session from the mobile device to the exchange.

  Therefore, in order to simultaneously realize accurate management of regional information and accurate authentication of mobile devices, it is preferable to use the first embodiment and the second embodiment in combination. FIG. 7 shows a sequence diagram when the first embodiment and the second embodiment are combined.

  In step S301, in order to establish a communication session, the mobile device transmits a SIP request to the SIP server via the wireless station. In step S303, the SIP server assigns a SIP-URI to the mobile device as a response to the SIP request. In step S305, the mobile device transmits authentication information to the certificate authority via the wireless station. In step S307, the certificate authority transmits the SIP-URI of the mobile device and the MAC address of the wireless station to the exchange. This SIP-URI and MAC address are stored in the correspondence table of the exchange. In step S309, an authentication check is performed from the certificate authority to the mobile device. When authentication fails, the connection is released. If the authentication is successful, in step S311, the mobile device attempts to communicate with the communication partner using the designated SIP-URI. The packet from the mobile device including the SIP-URI is further given a path identifier by the wireless station and is received by the exchange. The exchange generates regional information of the mobile device based on the SIP-RUI and the path identifier.

  In addition, this invention is not limited to said Example, A various change and application are possible within a claim.

A diagram showing a configuration example of a conventional mobile communication network The figure which shows the structural example of the radio | wireless IP communication system with which 1st Example of this invention is applied. Correspondence table used in the exchange in the first embodiment of the present invention Block diagram of an exchange in the first and second embodiments of the present invention The figure which shows the structural example of the radio | wireless IP communication system with which 2nd Example of this invention is applied. Correspondence table used in the exchange in the second embodiment of the present invention The sequence diagram which showed the communication procedure in the radio | wireless IP communication system which combined 1st Example and 2nd Example of this invention

Explanation of symbols

10, 20 Wireless IP telephone system 101, 201 Mobile station 103, 203 Wireless station 105, 205 Switch 107, 207 Corresponding table 109, 209 SIP server 111 Access line 213 Authentication station 151 Correspondence management unit 153 Corresponding table 155 Receiving unit 157 Packet Analysis unit 159 Regional information generation unit

Claims (4)

In wireless IP communication, an exchange that generates region information of a mobile device from an IP packet received from the mobile device via a wireless station,
A correspondence management unit that manages correspondence information between a path identifier of a line connecting the wireless station and the exchange, and area information of the wireless station;
A packet analysis unit that receives an IP packet from the mobile device and identifies a path identifier of a line connecting the wireless station and the switch from the IP packet;
From the path identifier specified by the packet analysis unit, a region information generation unit that generates region information of the mobile device based on the correspondence information;
Having an exchange. The correspondence management unit manages correspondence information between the path identifier, area information of the wireless station, and a unique number of the wireless station,
The correspondence management unit further manages the unique number of the wireless station and the terminal identifier of the mobile device with the correspondence information when the mobile device is authenticated by a certificate authority,
The packet analysis unit further specifies a terminal identifier of the mobile device from the IP packet,
The exchange according to claim 1, wherein the area information generation unit generates area information of the mobile device based on the correspondence information from a terminal identifier and a path identifier specified by the packet analysis unit. . The mobile station establishes and connects a communication session with the exchange according to a SIP protocol;
The unique number of the wireless station is the MAC address of the wireless station,
The exchange according to claim 2, wherein the terminal identifier of the mobile device is a SIP-URI. A wireless IP communication system comprising a mobile device, a wireless station, and an exchange that receives IP packets from the mobile device via the wireless station,
The switch manages correspondence information between a path identifier of a line connecting the radio station and the switch, and area information of the radio station;
The mobile station sends an IP packet to the exchange via the wireless station,
The switch specifies a path identifier of a line connecting the radio station and the switch from the IP packet,
The exchange is a wireless IP communication system that generates region information of the mobile device based on the correspondence information from a path identifier specified by the packet analysis unit.

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