JPH11150753A - Mobile telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile telephone system in which the communication cost is reduced and the fault tolerance is enhanced. SOLUTION: In a mobile telephone system provided with mobile telephone sets 1, 5, radio base stations 2, 4, and a position information management center 3 that connects to the radio base stations 2, 4 via a control line and manages information of the radio base stations 2, 4 in which the mobile telephone sets 1, 5 are placed, the radio base stations 2, 4 connect to an Internet 6 via network connectors 9, 10, the position information management center 3 manages an IP address of the network connectors 9, 10 connecting respectively to the radio base stations 2, 4, the radio base stations 2, 4 inquire about IP addresses of the network connectors 9, 10 connecting to the radio base stations 2, 4 in which the mobile telephone sets 1, 5 are placed of the position information management center 3 and connect a speech channel with the network connectors 9, 10 respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile telephone system, and more particularly to a system using an Internet network for a telephone line.

[0002]

2. Description of the Related Art The configuration of a conventional mobile telephone system is shown in FIG.
The mobile telephones 1 and 5, the radio base stations 2 and 4 that communicate with the mobile telephone, and the radio base station connected to the radio base station via a control line and where the mobile telephone is located Location information management center 3 that manages information on base stations
Consists of

A procedure for establishing a call in a conventional mobile telephone system will be described. First, the radio base station 2 detects that the mobile telephone 1 should call the mobile telephone 5. Next, the wireless base station 2 inquires of the position information management center 3 about the wireless base station where the mobile telephone 5 is located via the control line. Next, the location information management center 3 notifies the radio base station 2 that the mobile telephone 5 is located at the radio base station 4.
Notify to Next, the wireless base station 2 makes a call connection with the wireless base station 4 via the communication line. Finally, the radio base station 4 notifies the mobile telephone 5 that a call should be received. Thereby, communication is established between the mobile telephone 1 and the mobile telephone 5.

Accordingly, the location information management center has, for example, the following correspondence table between the telephone number of the mobile telephone and the identification number of the radio base station.

Mobile telephone number | wireless base station identification number 03-xxxx-0001 | a 03-xxxx-0002 | b 03-xxxx-0003 | b

[0006] This is because the mobile telephone having the telephone number 03-xxxx-0001 exists at the position of the radio base station a and the telephone number 03-xxxx-0001.
The mobile telephones 0002 and 03-xxxx-0003 indicate that they are located at the position of the radio base station b.

FIG. 2 is a configuration diagram of a conventional Internet telephone system. The Internet telephone system includes telephones 7 and 8, telephone networks 11 and 12 to which the telephones are connected, an Internet network 6, and a gateway that is a network connection device between the Internet network 6 and the telephone networks 11 and 12. 9 and 10.

A procedure for establishing a call in a conventional Internet telephone system will be described. First, the telephone 7 becomes the telephone 8
Call to the existing telephone network to make a call connection. The call from the telephone 7 is received by the gateway 9. The gateway 9
Makes a call connection with a gateway 10 located near the called telephone 8. At this time, the correspondence between the gateway 9 and the gateway 10 can be shown by inquiring a position information management server that is fixed or connected to the Internet network. The gateway 10
Makes a call to the telephone 8 to be called, and communication is established via the telephone network 12.

As described above, in the Internet telephone system, since the Internet network is used between the telephone networks, the communication cost is reduced particularly in long-distance communication. Also, although the call quality and reliability of the Internet itself are inferior to those of the existing telephone network, the automatic routing improves the fault tolerance for a failure at a specific point.

[0010]

However, in the conventional mobile telephone system, the connection between the radio base stations is maintained by a line owned by each communication company or a line borrowed from another company. Communication costs are always required. Further, there is an inconvenience that routing that occurs due to frequent position changes of the mobile telephone is difficult in the Internet network.

An object of the present invention is to provide a mobile telephone system in which communication costs can be reduced and fault tolerance is improved.

[0012]

According to the present invention, the radio base station is connected to the Internet via a network connection device, and the location information management center is connected to the network connected to each of the radio base stations. The wireless base station further manages the IP address of the connection device, and the radio base station inquires of the location information management center about the IP address of the network connection device connected to the radio base station where the mobile telephone to be connected is located. This is a mobile telephone system configured to connect a telephone line to a network connection device having an IP address. By using the Internet network for the telephone line, communication costs can be reduced.

According to another embodiment of the present invention, the radio base station is connected to the Internet via a plurality of network connection devices, and the location information management center is connected to each of the radio base stations. The IP addresses of the plurality of network connection devices are further managed in priority order, and when the location information management center is inquired about the IP address of the network connection device to be connected to the call,
It is preferable to be configured to return the IP address of the network connection device with the highest priority. This makes it possible to connect wireless base stations with multiple routes,
The fault tolerance of the call connection can be improved.

According to another embodiment of the present invention, when a network connection device having an IP address to be replied is in a congested state, the network connection device is configured to reply with the IP address of the network connection device having the next priority. Is also preferable. This makes it possible to avoid delay of voice data on the Internet as much as possible, and to provide as good a communication quality as possible.

[0015]

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

FIG. 3 is a block diagram of a mobile telephone system according to the present invention. The mobile telephone system has a gateway 9 between the radio base stations 2 and 4 in addition to the conventional configuration of FIG.
And 10 are connected to an Internet network 6, which is used as a telephone line. However, the control line is connected between the radio base station and the location information management center that acquires the location information of the mobile phone as in the conventional case.

Further, the location information management center according to the present invention has, for example, the following correspondence table between the radio base station identification number and the gateway IP address in addition to the conventional location management information.

Wireless base station identification number | Gateway IP address a | xxx.xxx.100.001 b | xxx.xxx.110.001 xxx.xxx.110.002 xxx.xxx.110.003

This is because the radio base station a has the IP address xx
x.xxx.100.001 and the wireless base station b has an IP address xxx.xxx.110.001
(Eg, gateway A), xxx.xxx.110.002 (eg, gateway B), and xxx.xxx.110.003 (eg, gateway C). The IP addresses of the wireless base station b are arranged in order of priority. It is preferable that the priority order is determined because the distance between the wireless base station and the gateway is short or the communication cost is short.
Therefore, when making a call connection with the radio base station b, the IP address xxx.xxx.110.001 of the gateway A is first answered. However, if the gateway having the IP address is in a congested state or has failed,
The IP address xxx.xxx.110.002 of the next gateway B is returned.

A procedure for establishing a call in the mobile telephone system according to the present invention will be described. First, the radio base station 2 detects that the mobile telephone 1 should call the mobile telephone 5. Next, the wireless base station 2 inquires of the location information management center 3 via the control line about the IP address of the gateway connected to the wireless base station where the mobile telephone 5 is located. Next, the location information management center 3 notifies the radio base station 2 of the IP address of the gateway A that is connected to the radio base station 4 where the mobile telephone 5 is located and has the highest priority. However, when the gateway A is in a congested state or has a failure, the IP address of the gateway B in the next priority is notified. Next, the wireless base station 2
Then, the call is connected to the previously notified gateway via the Internet network 6. Finally, the radio base station 4 connected to the gateway notifies the mobile telephone 5 that a call should be received. Thereby, the mobile telephone 1 and the mobile telephone 5
Communication is established with.

Although the embodiment of the mobile telephone system of the present invention has been described above, various changes, modifications and omissions of the technical concept and the scope of the present invention can be easily made by those skilled in the art. it can. Therefore, the above description is merely an example and is not intended to be limiting. The invention is limited only as defined by the appended claims and equivalents thereof.

[0022]

As described in detail above, the mobile telephone system according to the present invention has a special configuration in which the Internet is used between wireless base stations for establishing communication, thereby reducing communication costs. It is intended to provide a special effect that the fault tolerance can be improved and the call quality can be prevented from deteriorating due to the congestion of the Internet network.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a conventional mobile telephone system.

FIG. 2 is a configuration diagram of a conventional Internet telephone system.

FIG. 3 is a configuration diagram of a mobile telephone system according to the present invention.

[Explanation of symbols]

 1, 5 mobile telephone 2, 4 wireless base station 3 location information management center 6 Internet network 7, 8 telephone 9, 10 gateway, network connection device 11, 12 telephone network

Continued on the front page (72) Inventor Teruo Hamano 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Japan Telegraph and Telephone Corporation (72) Inventor Noboru Sonehara 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Telephone Co., Ltd.

Claims (3)

[Claims] 1. A mobile telephone, a radio base station that communicates with the mobile telephone, and manages information of the radio base station connected to the radio base station via a control line and in which the mobile telephone is located. In a mobile telephone system having a location information management center, the radio base station is connected to the Internet via a network connection device, and the location information management center is connected to each of the radio base stations. The radio base station further manages an IP address of a network connection device, and the radio base station communicates with the location information management center with an IP address of a network connection device connected to the radio base station where the mobile telephone to be call-connected is located. And a mobile telephone system configured to connect a telephone line to a network connection device having the IP address. 2. The wireless base station is connected to the Internet via a plurality of network connection devices, and the location information management center is connected to the plurality of network connection devices connected to each of the wireless base stations. The IP address is further managed in priority order, and the location information management center replies the IP address of the network connection device with the highest priority when inquired about the IP address of the network connection device to be connected. The mobile telephone system according to claim 1, wherein the mobile telephone system is configured as follows. 3. The location information management center is configured to reply with the IP address of the next highest priority network connection device when the network connection device having the IP address to be replied is in a congestion state. The mobile telephone system according to claim 2, wherein