JPH05211471A - Radio call channel changeover system - Google Patents

Abstract

PURPOSE:To eliminate an interruption time of a radio call channel for call changeover. CONSTITUTION:As a mobile set 1 approaches a border between service areas A, B, since an electric field intensity of a CHa is weakened, it is required to select a new call channel and the base station A sends its report to the base station B. The base station B receiving the report assigns a CHb to the mobile set 1 to attain signal transmission and reception. That is, the mobile set 1 uses the CHa, CHb and enters the service area B over the border while making one talking. When the electric field intensity of the CHb reaches an intensity enough to maintain the call, the CHa is interrupted and then the mobile set 1 continues call via the base station B with the CHb only.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication channel switching system in a car telephone system.

[0002]

2. Description of the Related Art In a conventional car telephone system, when the system switches a call channel, a system is used in which a call channel in use by a mobile unit is disconnected and then a new call channel is tuned.

[0003]

In the above-mentioned conventional car telephone system, since the mobile terminal can transmit and receive only one radio call channel when the system switches the call, tuning of a new radio call channel is started. Since the radio call channel in use must be disconnected before, there is a call interruption between the disconnection of the radio call channel in use and the ready state after the new radio call channel has been tuned There is a drawback.

It is an object of the present invention to provide a radio communication channel switching system in which a mobile terminal is equipped with a radio receiving device capable of transmitting and receiving two radio communication channels to control two radio communication channels when switching a communication. It is in.

[0005]

According to the wireless communication channel switching method of the present invention, a mobile device having first and second transmitting / receiving means is configured to transmit a first mobile station including the first transmitting / receiving means via a first base station.
When moving to the service area of the second base station adjacent to the first base station while continuing the call with the other subscriber using the wireless call channel of Setting a second radio call channel via the base station to continue the call, and disconnecting the first radio call channel when the mobile device reaches the service area of the second base station. Is characterized by.

When the mobile station approaches the boundary with the service area of the second base station, the first base station notifies the second base station to that effect, and receives the notification. The second base station may set the second radio communication channel with the mobile device.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a mobile device showing an embodiment of a wireless communication channel switching system of the present invention, FIG. 2 is a block diagram of a car telephone system showing an application example of the present invention, and FIG. 3 shows an operation in the application example. It is a flow chart for explaining.

In FIG. 2, it is assumed that a mobile unit 1 moves from point a in service area A of base station A to point c in service area B of base station B while talking. Point b is service area A, B between points a, c
Near the boundary of.

The mobile unit 1 at the point a is in communication with the base station A using a radio communication channel (hereinafter referred to as CHa). As the mobile device 1 approaches the boundary between the service areas A and B, the electric field strength of CHa becomes weaker, so that it becomes necessary to switch the communication channel, and the base station A sends the report to the base station B. Upon receiving the report, the base station B can transmit and receive a signal by allocating a radio communication channel (hereinafter, CHb) to the mobile device 1. That is, the mobile device 1 crosses the boundary and enters the service area B while making one call using CHa and CHb. Then, when the electric field strength of CHb becomes strong enough to maintain the call, CHa is disconnected, and then the mobile unit 1
Keeps talking through the base station B only by CHb.

The mobile unit 1 has an antenna 1 as shown in FIG.
5, a transmission / reception demultiplexer 2 for demultiplexing radio waves transmitted / received, receivers 3, 4 for receiving call signals from the transmission / reception demultiplexer 2, and calls from the receivers 3, 4 via switches 7, Signal-to-speech converter (hereinafter S / V) 11 for converting a signal into a sound signal
A speaker 13 for outputting a voice signal from the S / V 11, a voice / signal converter (hereinafter V / S) 12 for converting a voice signal from the microphone 14 into a call signal, and a V / S 12
And the transmitters 5 and 6 for transmitting the output of 1 to the duplexer 2 via the switches 9 and 10.

Next, the operation of this embodiment will be described with reference to FIG. When the mobile device 1 is located at point a shown in FIG. 1, the switches 7 and 9 are turned on, the switches 8 and 10 are turned off, and the receiver 3 and the transmitter 5 are used to talk to the other subscriber through CHa. (Step 100). When the mobile device 1 moves, the electric field strength of CHa weakens and when the mobile station 1 reaches the point b, the base station A instructs the base station B to set CHb (step 101). This C is set in mobile unit 1 by setting CHb.
Tuning to Hb (step 102) and turning on the switches 8 and 10 (step 103). As a result, a call between the mobile device 1 and the other party subscriber is performed via CHa and CHb using the receivers 3 and 4 and the transmitters 5 and 6 (step 104). In the receiver 4, base stations B to C
SAT indicating the electric field strength of Hb (SUPER AUDIO
When the level of (TONE) becomes sufficient (step 105), the switches 7 and 9 in the mobile device 1 are turned off (step 106). This cuts CHa,
When ST (STATUS SIGNAL) which is the report is transmitted to the base station B (step 107), only CHb is used for the call (step 108).

[0012]

As described above, according to the present invention, by adding a wireless transmission / reception means capable of transmitting / receiving a signal to / from two wireless communication channels to a mobile unit, it is possible to eliminate the interruption time of the wireless communication channel when switching the communication. Have.

[Brief description of drawings]

FIG. 1 is a block diagram of a mobile device showing an embodiment of a wireless communication channel switching system of the present invention.

FIG. 2 is a block diagram of a car telephone system showing an application example of the present invention.

FIG. 3 is a flowchart for explaining an operation in this application example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mobile device 2 Transmission / reception demultiplexer 3,4 Receiver 5,6 Transmitter 7, ~, 10 Switch 11 Signal / speech converter (S / V) 12 Speech / signal converter (V / S) 13 Speaker 14 Microphone 15 antenna

Claims (2)

[Claims] 1. A mobile device having first and second transmission / reception means continues a call with a partner subscriber by the first transmission / reception means using a first radio communication channel via a first base station. Meanwhile, when moving to the service area of the second base station adjacent to the first base station, the second wireless communication channel is set by the second transmitting / receiving means via the second base station. A radio communication channel switching system, characterized in that the call is continued and the first radio communication channel is disconnected when the mobile device reaches the service area of the second base station. 2. The first base station notifies the second base station when the mobile unit approaches the boundary with the service area of the second base station, and receives the notification. The radio communication channel switching system according to claim 1, wherein the second base station sets the second radio communication channel with the mobile device.