JPS62294342A - Communication system applying cellular automobile telephone exchange system - Google Patents

Abstract

PURPOSE:To reduce the installation cost by making talking through a radio base station only not via an approach link and a telephone exchange station between radio telephone stations existing in the service area of a radio base station so as to reduce the number of installed approach links. CONSTITUTION:The call signal of a prescribed frequency from radio telephone stations 1a-1n existing in the service area 6 of the radio base station 3a is received and reception information is sent to a telephone station 4 via the approach link 5. The radio base station 3a is provided with an identification means decoding a call signal and identifying the telephone number of a caller and a called party and a frequency change command means commanding the change of the frequency into a prescribed talking frequency when it is discriminated that the caller and the called party exist in its own service area 6 based on the result of identification of the identification means.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a telephone exchange system, and is characterized in that it can be applied particularly to depopulated areas. Rural is concerned with wireless application switching systems.

It was supposed to be used as a method.

(Problems to be Solved by the Invention) In the conventional cellular car telephone switching system described above, even in the case of a call between wireless telephone subscribers existing within the service area of the same wireless base station, the caller - Wireless base station - Telephone exchange - S1 year,
It also has the disadvantage of using a radio frequency channel for two calls.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a communication system that requires fewer communication channels than before.

(Means for Solving the Problems) In order to solve the above-mentioned problems and achieve the above objects, the communication system provided by the present invention transmits a paging signal from a wireless telephone station such as a car phone to a wireless base station. A cellular mobile telephone switching system in which the telephone exchange is performed at a telephone exchange via an approach link after receiving the telephone exchange, and after the exchange by the telephone exchange, a called party E is connected via the approach link and a wireless base station, The present invention is characterized in that calls between wireless telephone stations existing within the service area of the base station are made only through the wireless base station, without passing through the approach link and the telephone exchange.

(Example) FIG. 1 is a block diagram showing one embodiment of the present invention.

First, the configuration will be described. 1a, . . . , 1n are a plurality of wireless telephone stations, and a mobile phone or a fixed wireless telephone device equipped with a wireless transmitter/receiver of a predetermined frequency is applied. 3a...3n are a plurality of radio base stations, and each radio base station 3a...3n is connected to a telephone exchange via an approach link 5 serving as a communication line. 4 is connected.

Here, to explain the plurality of wireless base stations 3a...3n as a representative of the wireless base station 3a, the wireless base station 3a...
A wireless telephone station 1a existing within the service area 6 of...
. . . Receives a calling signal on a predetermined frequency from ln, and transmits the received information to the telephone exchange 4 via the approach link 5. The wireless base station 3a also includes identification means for decoding the calling signal and identifying the telephone numbers of the calling party and the called party, and the calling party and the called party based on the identification results of the identification means. Frequency change command means is provided for instructing the calling party and the called party to change to a predetermined communication frequency when it is determined that the calling party exists within the service area 6.

Next, the operation will be explained. As shown in FIG.
When a calls signal 15 of frequency f1 is transmitted, it is received by the radio base station 3a, and this reception information is transmitted to the telephone exchange 4 via the approach link 5. The telephone exchange 4 decodes the telephone number of the called party based on the received information, and when it determines that the called party exists in the same service area 6 as the calling party, an exchange is made to connect with the called party. The information is transmitted to the radio base station 3a via the approach link 5. Wireless base station 3
a is the frequency f, I for the wireless telephone station in which is the called party.
The call signal 18 is transmitted.

On the other hand, in the radio base station 3a, based on the identification result of the identification means, the calling party 1a and the called party 1n are
As shown in FIG. 2, when it receives a response signal 17 of frequency f from the called party in, it drives the same wave number change command means to send the signal to the called party 1n. To change the reception frequency from f, fl8 to fl15,
Also, the receiving frequency is set to f for the caller la, from '16 to f.
217, and the calling party 1a and the called party in
Connect via relay.

Therefore, as shown in FIG. 2, the frequency f from the calling party 1a
The transmission information 15 of , is directly transmitted to the called party in via the radio base station 3a, and the response information 17 of the frequency f, from the called party 1n is directly transmitted to the calling party 1a via the radio base station 3a. transmitted.

(Effects of the Invention) As described above, according to the present invention, it is possible to obtain the effects that fewer communication paths are required than in the past, the number of installed approach links can be reduced, and equipment costs can be reduced.

[Brief explanation of the drawing]

Figure 1 is a connection diagram of a communication path in an embodiment of the present invention (during call setup)
, FIG. 2 is a connection diagram of the communication path in the busy state in the embodiment, and FIG. 3 is a connection diagram of the communication path in the busy state in the conventional system. 1a to In... Wireless telephone station, 3a to 3n... Radio base station, 4... Telephone exchange, 5... Approach link, 6... Service area.

Claims (1)

[Claims] After a calling signal from a wireless telephone station such as a car phone is received at a wireless base station, it is exchanged at a telephone exchange via an approach link, and after the exchange at the telephone exchange, the approach link and the wireless base station are exchanged. In a cellular mobile telephone switching system that connects to a called party via a telephone exchange, wireless communication between radio telephone stations existing within the service area of the radio base station is performed without going through the approach link and the telephone exchange. A communication system using a cellular car telephone switching system, which is characterized in that calls are made only through base stations.