JP2636703B2 - Mobile phone system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cellular mobile telephone and, more particularly, to a communication path setting between a base station and a central office which accommodates a communication partner.

[0002]

2. Description of the Related Art A conventional cellular mobile telephone system comprises a plurality of radio base stations, each of which has a plurality of radio channels, and comprises a plurality of radio base stations constituting a cell and a radio exchange station which controls these base stations and performs switching connection. That is, all the communication lines provided by each radio base station are set through the approach link provided between the radio base station.

[0003] Among communications performed through this system, communications between subscribers of other exchanges which are not under the control of the same exchange are performed by the wireless exchange from other exchanges for other stations in which communication partners are accommodated. A station or a wireless switching center is connected through an interoffice trunk line.

In the central office switching network, there is provided a so-called diagonal line which connects two stations having no direct relation to each other, in addition to a trunk line which sequentially connects the direct superordinate stations with a higher order station in a multi-stage star shape according to the station rank. In some cases, the economy of the switching network configuration is improved. However, since the radio base station of the mobile telephone system is not an independent exchange, diagonal lines cannot be controlled by itself, and a configuration having diagonal lines cannot be realized.

[0005]

Generally, in a mobile telephone system, the ratio of intra-office calls between mobile subscribers is low, and almost all calls are made between mobile subscribers and fixed subscribers. In addition, in particular, radio base stations installed in depopulated areas are often controlled by radio switching centers installed in distant local cities, but even in this case, most of the calls handled by mobile switching stations are located in mobile areas in depopulated areas. Communication between fixed subscribers.

In such a case, in the conventional system, a call handled by a radio base station is first connected to a radio exchange which controls the radio base station, and then, through an inter-station trunk line, a call for a station accommodated by a communication partner. Connected to the exchange. For this reason, a round-trip line between the local city and the depopulated area is used, which is not economical.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for controlling a plurality of radio base stations having a plurality of radio channels via an approach link and exchanging the plurality of radio base stations. In a mobile telephone system formed by a radio switching center for connection and a central office connected to the radio exchange, the mobile telephone system is provided between a radio base station and a central office which are geographically adjacent to each other. Provided, and each exchange has a common line signaling device for transmitting and receiving interoffice signals, and the wireless exchange has a station between the called party and the calling party based on the analysis of the called party number. Communication line selecting means for confirming that the lines are connected by the direct line and assigning the direct line preferentially.

[0008]

By providing a direct line between a locally adjacent radio base station and a central office, communications between the stations can be performed as long as the direct line has a margin, and other radio exchanges and other central office exchanges can be used. Is performed directly using the line, not via the network.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

The radio switching center 1 is installed in a local city and controls a plurality of suburban radio base stations 2b, 2c and 2d and a radio base station 2a located in a geographically distant village. On the other hand, fixed-line telephone subscribers use the central office 3
a, It is assumed that a certain settlement of the radio base station 2a is covered by another central office 3b. The wireless switching center 1 and the central office 3a, and the central offices 3a and 3b are connected by trunk lines 4a and 4b, respectively. Also, the exchange 1,
3a and 3b are provided with common line signaling devices 5a, 5b and 5c, respectively, so that the exchanges 1, 3a and 3b can communicate and negotiate the communication path setting with common exchange signals using common line signals. The wireless switching center 1 and each of the wireless base stations 2a, 2b, 2c, 2
Between d, approach links 6a, 6b, 6c and 6d are provided for controlling the radio base station and supplying the communication line. A direct line 7 is provided between the wireless base station 2a and the central office 3b in the same village.

Now, when a mobile subscriber 8 moving to the above-mentioned village, which is slightly away from a local city, attempts to communicate with a fixed subscriber 9 in the same village, in the conventional system, an approach link 6a and an inter-office trunk are used. A call is connected using the lines 4a and 4b. In the present invention, direct line 7 is preferentially assigned.
The program which is the communication line selecting means to be used
The mobile switching center 1 that has received the connection request analyzes the called party number according to the built-in program, and the called party 9
Check whether it is accommodated in the exchange 3b, and
When the usage status of the connection line 7 is checked and it is found that the called party 9 is accommodated in the central office 3b connected by the direct line 7,
As long as the line capacity of the direct line 7 has a margin, the line setting using the direct line 7 is performed. Therefore, the wireless switching center 1 notifies the central office 3b of the channel allocation result using the common channel signaling device 5a, and sets up a communication path. The wireless base station 2a is also instructed to connect the communication path. If there is no room in the direct line 7, the call is connected using the same route as the conventional system.

Next, a case where a call is requested from the fixed subscriber 9 to the mobile subscriber 8 will be described. The central office 3b analyzes the called party number, finds out that the exchange accommodating the called party is the wireless switching center 1, and issues a connection request using the common channel signaling devices 5c, 5b, 5a. The station 1 is notified, and a communication path using the inter-office trunk lines 4b and 4a is reserved. The radio switching center 1 calls the subscriber 8 to each radio base station in the service area, and responds to the mobile subscriber 8 so that the mobile subscriber 8 is directly connected to the radio base station 2a.
Know that you are in the jurisdiction of On the other hand, the wireless switching center 1 transmits a ringing tone to the fixed subscriber 9. Thereafter, the wireless switching center 1 checks the use state of the direct line between the central office 3b and the wireless base station 2a, and if there is a vacancy, changes the connection using the common channel signal to the central office 3b. Negotiate with and implement the connection change to the direct line 7. When the mobile subscriber 8 is in the service area of the wireless base station 2d which is not directly connected by a line, the mobile subscriber 8 is connected using the same route as the conventional method.

[0014]

As described above, according to the present invention, when a radio base station installed in a depopulated area is controlled by a radio exchange installed in a remote local city, a fixed subscriber in the same area is controlled. Is connected using a direct line, so that a round-trip line between a local city and a depopulated area is not used, and the economy can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

[Description of Signs] 1 Wireless switching station 2a, 2b, 2c, 2d Wireless base station 3a, 3b Central office switching station 4a, 4b Inter-station trunk line 5a, 5b, 5c Common line signaling device 6a, 6b, 6c, 6d Approach Link 7 Direct line 8 Mobile subscriber 9 Fixed subscriber

Claims (1)

(57) [Claims] 1. A plurality of radio base stations having a plurality of radio channels, a radio exchange which controls the plurality of radio base stations via an approach link to perform exchange connection, and is connected to the radio exchange. In a mobile telephone system formed by a central office and a central office, a direct line provided between a radio base station and a central office that are geographically adjacent to each other, and each central office exchanges signals between offices. A common line signaling device for performing the communication , the wireless switching center confirms that the offices of the called party and the calling party are connected by the direct line based on the analysis of the called party number, and A mobile telephone system comprising: a communication line selecting means for preferentially allocating a line.