JPH05252103A - Digital mobile telephone system - Google Patents

Abstract

PURPOSE:To increase connection processing quantity by setting a half rate for a call of communication when the use of the channel of a radio base station is concentrated. CONSTITUTION:When a call is issued from a mobile telephone terminal (MSS) 1, the radio base station (MBS) 2 receives a call issuing signal, and a control part (CTL) 23 judges whether or not traffic congestion occurs on a radio channel. When it is decided that the traffic congestion occurs, the CTL 23 sends out a half rate request signal to the MSS 1. The MSS 1 judges whether or not a CTL 13 half rate can be set, and a CTL 13 transmits a feasibility signal to the MBS 2 when the communication is being performed. The CTL 23 transmits a half rate start signal to the MSS 1, and allocates one channel to the MSS 1, and makes a data compression part (HRT) 22 compress speech data by issuing an instruction. The MSS1, when receiving the half rate start signal, reduces input information quantity to a CTL13 digital/analog converter (D/A) 12 to the half, and makes it perform analog conversion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital mobile telephone system, and more particularly to a digital mobile telephone system for increasing channels when traffic is high.

[0002]

2. Description of the Related Art In a conventional digital car telephone system, incoming and outgoing calls are restricted when traffic rises.

[0003]

In the above-mentioned conventional digital mobile telephone system, incoming and outgoing calls are regulated when the traffic rises. Therefore, the traffic concentrates on a certain radio base station instead of the rise of the traffic of the automobile telephone exchange. Even in this case, there was a problem that incoming and outgoing call restrictions were imposed.

[0004]

The digital car telephone system of the present invention is a digital car telephone system for performing data and digital voice communication, wherein a radio base station monitors the use state of a radio transmission path with a car telephone terminal. During traffic congestion and when the car telephone terminal originates a voice call, the signal transmission speed on the wireless transmission line is reduced to half the normal transmission and reception.

The wireless base station allocates two channels to the wireless transmission path when there is no traffic congestion when receiving a voice call from the car telephone terminal,
In the case of the traffic congestion, one channel is allocated to the wireless transmission path, and compression means for compressing the signal transmission speed to half the normal is provided, and the car telephone terminal receives the half rate request signal from the wireless base station. A digital / analog conversion means for performing analog conversion by halving the amount of digital audio information that is sometimes input may be provided.

[0006]

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 digital car telephone system of the present invention, and FIG. 2 is a flow chart showing the operation in FIG.

The system of this embodiment is a digital car telephone system for performing digital voice and data communication, and as shown in FIG. 1, a car telephone terminal (hereinafter referred to as MSS).
1, a radio base station (hereinafter referred to as MBS) 2, and a car telephone exchange (hereinafter referred to as MSC) 3. MSS1 is MBS
A transceiver (hereinafter TRX) 11 for transmitting and receiving a signal to and from a wireless channel 2 and a digital-analog converter (hereinafter D) for performing analog conversion by halving the amount of input information when the input information is digital voice. / A) 12 and TR
Control unit (hereinafter CTL) 1 for controlling X11 and D / A12
3 and 3. The MBS2 and the TRX21 that transmits and receives signals to and from the MSS1 via a wireless channel,
If the input information is digital voice during high traffic by monitoring the usage state of the wireless channel, the CTL 23 for instructing the half rate start and the TR by the half rate start instruction
A compression unit that compresses the transmission data to X21 in half (hereinafter referred to as H
RT) 22. In addition, MSC3 is MBS2
Is connected via a wired transmission line to make an exchange connection for incoming and outgoing calls.

Next, the operation of this embodiment will be described with reference to FIG. When the MSS1 makes a call, the MBS2 receives the call signal, and the CTL 23 determines whether or not the wireless channel is under traffic congestion (step S1). If the traffic is low (No in S1), the CTL 23 is the MSC.
Call signal to MSC3, and when a response signal from MSC3 is received, two channels (for example, 16 Kbps × 2) are allocated (S11), and the call between the called party of MSC3 and MSS1 at the normal transmission rate. Signals are transmitted and received (S1
2).

If it is judged Yes in S1, that is, traffic congestion, the CTL 23 transmits a half rate request signal to the MSS 1 (S2). CTL13 for MSS1
Determines if it can be half-rate. If the communication is data communication, half rate is not possible (N in S3
o), transmits an impossibility signal to MBS2 (S31), and MBS2 which received this transmits a call restriction signal to MSS1 to restrict the call (S32) or allocates two channels and does not halve the transmission rate. Make a call (S11, S1
2).

In S3, Yes, that is, if voice communication is possible, half rate is possible, so the CTL 13 sends a possible signal to MB.
It is transmitted to S2 (S4). Then, the CTL 23 transmits a half rate start signal to the MSS 1 (S5). Then C
TL23 uses one channel (1
Release 6 Kbps, ie 1 channel (16 Kbps)
(S) is assigned (S6), and the HRT 22 is instructed to compress the audio data (S7). When MSS1 receives the half rate start signal, CTL13 sends D / A12
The amount of information input to is halved and analog conversion is performed (S8). As a result, a call signal is transmitted / received between MSS1 and MBS2 at a half rate, that is, at a transmission rate of half (S9).

When the transmission / reception information is data,
Half-rate communication is not performed, but communication is performed at normal transmission speed.

[0012]

As described above, according to the present invention, when the use of the channel of the wireless base station is concentrated, the number of channels is doubled by making the rate of the voice communication call half the rate. It has the effect that the amount can be increased.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a digital car telephone system of the present invention.

FIG. 2 is a flowchart showing an operation in FIG.

[Explanation of symbols]

 1 Car Telephone Terminal (MSS) 2 Radio Base Station (MBS) 3 Car Telephone Switch (MCS) 11, 21 Transceiver (TRX) 12 Digital-Analog Converter (D / A) 13, 23 Control Unit (CTL) 22 Data Compressor (HRT)

Claims (2)

[Claims] 1. In a digital car telephone system for performing data and digital voice communication, a radio base station monitors a use state of a radio transmission path between the car telephone terminal and the mobile telephone terminal, and when the traffic congestion occurs and the car telephone terminal makes a voice call. When transmitting a call, the digital mobile telephone system is characterized in that the signal transmission speed on the wireless transmission line is reduced to half of the normal transmission / reception. 2. The radio base station allocates two channels to the radio transmission line when there is no traffic congestion when receiving a voice call from the car telephone terminal, and when the traffic congestion occurs, the radio base station allocates two channels to the radio transmission line. A compression means is provided for allocating one channel to the wireless transmission path and compressing the signal transmission speed to half of the normal one, and the mobile telephone terminal receives the amount of digital voice information to be input when receiving the half rate request signal from the wireless base station. 2. A digital car telephone system according to claim 1, further comprising a digital-analog conversion means for converting the signal to an analog signal in half.