JPH09322224A - Digital mobile communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a radio mobile station awaiting communication through a control channel to recognize change of a control channel information bit without descrambling data by changing the control channel information bit in the case of transferring the control channel for a communication channel. SOLUTION: One channel of each frame sent from radio base stations BS 1-BSk to radio mobile stations MS1-MSn is used for a control channel. In the case that the radio mobile station MS4 makes a call request, the radio base station BS1 reports it to the radio mobile station MS4 that the control channel is assigned to a communication channel. The control channel information bits of a signal format from the radio base station to the radio mobile station not scrambled are changed to report the change from the control channel to the communication channel with respect to the radio mobile station MS5 awaiting through the control channel. Thus, the radio mobile station MS5 recognizes early the control channel of other base station zone and accesses it without descrambling data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital mobile communication system, and more particularly to a digital mobile communication system that facilitates the operation of a radio mobile station during control channel communication.

[0002]

2. Description of the Related Art As an example of a conventional technique of this kind, a "digital mobile radio communication system and a channel control method thereof" disclosed in Japanese Patent Application Laid-Open No. 4-275729 will be described.

FIG. 1 is a block diagram of a digital mobile communication system.

A digital mobile communication system includes a plurality of radio mobile stations MS1 to MSn and these radio mobile stations MS1 to MSn.
A plurality of wireless base stations B connected to the Sn via a wireless line
S1 to BSk, and a control station device 1 connected to the wireless base stations BS1 to BSk via a wired telephone line.

[0005] The control station device 1 is connected to a plurality of wired telephone networks, and connects a communication path from the wired telephone network to the radio mobile stations MS1 to MSn via the radio base stations BS1 to BSk. A communication path from MS1 to MSn to a wired telephone network or another wireless mobile station is defined by a wireless base station BS.
1 to BSk can be controlled. The radio mobile stations S1 to MSn are radio base stations BS.
It is also possible to perform control of where the data exists from 1 to BSk.

Each of the radio base stations BS1 to BSk has a base zone 2 and a radio mobile station MS existing in its own zone.
1 to MSn, and can transmit and receive control signals and audio signals to and from the control station device 1.

If the radio mobile stations MS1 to MSn are present in the base zone 2 of the radio base stations BS1 to BSk, the radio mobile stations MS1 to MSn are connected via the radio base stations BS1 to BSk and the control station device 1 to the wired telephone network or other radio mobile stations. Can communicate with.

Next, the TDMA / TDM system, which is a communication system, is basically the same as the conventional system, and a description thereof will be omitted. Here, a case where one frame is divided into four channels as shown in FIG. 4 will be described.

FIG. 4 is a diagram showing a state of a frame transmitted from a radio base station to a radio mobile station, in a case where all communication channels are in use and are blocked.

The time slot of CH1 in FIG. 4 is a control channel allocated for communication of control information such as base zone information, location registration of a radio mobile station moving from another zone, and transmission / reception of communication. . CH2 to CH4 are
This is a communication channel assigned to a wireless mobile station.

FIG. 4 shows that the radio mobile station MS1 performs communication using CH2, the radio mobile station MS2 performs communication using CH3, and the radio mobile station MS3 performs communication using CH4. This is a case where the mobile stations MS4 and MS5 receive the control channel on CH1 and are in a standby state.

FIG. 5 is a diagram showing a state of a frame transmitted from the radio base station to the radio mobile station. When all communication channels are in use and blocked, a transmission request is issued from the radio mobile station. FIG.

FIG. 5 shows a case where the radio mobile station MS4 makes a call request from the state of FIG. The procedure at this time is as follows. First, when the radio mobile station MS4 requests transmission, there is no available communication channel, so the control channel is used to allocate the control channel to the communication channel, and another station is waiting. An instruction is issued to the radio mobile station MS5.

At this time, the radio mobile station MS5 receives the control channel on CH1, continues to receive CH1 as it is even if control channel information is not found, and returns a busy tone in response to the user's transmission request. After that, the control channel CH1 is assigned to the radio mobile station MS4 as a communication channel.

FIG. 6 is a diagram showing a state of a frame transmitted from the radio base station to the radio mobile station, where the control channel is diverted to a communication channel and the radio mobile station MS4 is communicating.

Further, it does not issue an instruction to the radio mobile station MS5 to continue receiving the control channel, but instructs the radio mobile station MS5 to be under the control of the radio base station 1 in another base station zone 2. Describes that a control channel of another base zone 2 may be found and the location registered, and the base zone 2 may be shifted.

As described above, conventionally, when a control channel is diverted to a communication channel, the above-mentioned instruction to another waiting radio mobile station is notified only immediately before diverting a control channel to a communication channel. Wireless mobile stations other than the wireless mobile station that can receive this notification access the control channel diverted to the communication channel based on the recognition that the control channel remains the control channel.
Although it can be seen by referring to the error correction code included in the received data that the control channel is diverted to the communication channel, since this error correction code is included in the scrambled portion of the received data, After the access, the received data is descrambled, and thereafter, by referring to the error correction code, it is recognized for the first time that the control channel is diverted to the communication channel.

[0018]

SUMMARY OF THE INVENTION In the prior art,
In a digital mobile communication system, at least one of a plurality of channels is a control channel, and the other channels are communication channels. At this time, the radio base station diverts the control channel to the communication channel when all the communication channels are in use and is blocked, and transmits to the radio mobile station that has been waiting for an incoming call before diverting the control channel to the communication channel. Control is performed to wait for reception of a control channel, or control to shift to a control channel of another radio base station.

Therefore, when the control channel is diverted to the communication channel, the fact that this is notified to a radio mobile station (such as a radio mobile station waiting for an incoming call) not related to the communication is because the control channel is shifted to the communication channel. Just before the call, if the wireless mobile station waiting for an incoming call does not receive the information by accident, in the case of a wireless mobile station that has shifted from another base zone, or in a communication channel managed by a control channel that has shifted to a communication channel. If the radio mobile station that was in a call becomes a radio mobile station waiting for a call to end, the signal format is used for the control channel unless it is necessary to de-scramble the received data and refer to the error correction code. However, there is a problem that the wireless mobile station cannot determine whether it is for a communication channel.

[0020]

The digital mobile communication system according to the present invention always uses unscrambled layer 1 signals between the time when the control channel shifts to the communication channel and the time when the control channel returns to the control channel. The wireless mobile station is notified that the channel is used as a communication channel.

Here, the notification using the unscrambled layer 1 signal is performed not only on one channel whose control channel has shifted to the communication channel but also on the communication channel managed by the control channel. .

The digital mobile communication system according to the present invention comprises:
When the control channel is diverted as a communication channel, a notification to that effect is made in the standby radio mobile station and the communication channel managed by the control channel while the control channel is diverted to the communication channel. Therefore, the radio mobile station that has received the notification can easily perform the subsequent operations.

[0023]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the drawings.

The configuration of an embodiment of the digital mobile communication system according to the present invention is the same as that of FIG. 1 and will be described with reference to FIG.

The digital mobile communication system comprises a plurality of radio mobile stations MS1 to MSn and the radio mobile stations MS1 to MS.
A plurality of wireless base stations B connected to the Sn via a wireless line
S1 to BSk, and a control station device 1 connected to the wireless base stations BS1 to BSk via a wired telephone line.

The control station device 1 is connected to a plurality of wired telephone networks, and connects a communication path from the wired telephone network to the radio mobile stations MS1 to MSn via the radio base stations BS1 to BSk. A communication path from MS1 to MSn to a wired telephone network or another wireless mobile station is defined by a wireless base station BS.
1 to BSk can be controlled. The radio mobile stations S1 to MSn are radio base stations BS.
It is also possible to perform control of where the data exists from 1 to BSk.

Each of the radio base stations BS1 to BSk has a base zone 2 and a radio mobile station MS existing in its own zone.
1 to MSn, and can transmit and receive control signals and audio signals to and from the control station device 1.

If the radio mobile stations MS1 to MSn are present in the base zone 2 of the radio base stations BS1 to BSk, the radio mobile stations MS1 to MSn are connected via the radio base stations BS1 to BSk and the control station device 1 to a wired telephone network or another radio mobile station. Can communicate with

Next, the operation of this embodiment will be described.

In the base zone 2 of the radio base station BS1, radio mobile stations MS1 to MS5 exist, and the radio mobile stations MS1 to MS5 exist.
It is assumed that communication is being performed on the communication channel up to MS3, and radio mobile stations MS4 and MS5 have received the control channel and are in a standby state.

FIG. 2 is a diagram showing a format of a control channel transmitted from the radio base stations BS1 to BSk to the radio mobile stations MS1 to MSn.

According to the present embodiment, the radio base station BS1
2 to the control channel information bits shown in FIG. 2 are newly added to the control channel information transmitted from the BSk to the wireless mobile stations MS1 to MSn. The control channel information bit is a bit indicating whether the control channel is in operation (used as a control channel) or not in operation (used as a communication channel, Luka), and is not scrambled. .

FIG. 3 is a diagram showing a format of a communication channel transmitted from the radio base stations BS1 to BSk to the radio mobile stations MS1 to MSn.

According to the present embodiment, the radio base station BS1
The control channel information bit shown in FIG. 3 is newly added to the information of the communication channel transmitted from BSk to BSk to the radio mobile stations MS1 to MSn. The control channel information bit is a bit indicating whether the control channel is in operation (used as a control channel) or not in operation (used as a communication channel, Luka), and is not scrambled. .

The structure of a frame transmitted from the radio base stations BS1 to BSk to the radio mobile stations MS1 to MSn is 1
The frame has four channels, and one of the four channels
The channel is a control channel, and the three channels are communication channels.

In this state, it is assumed that the mobile station MS4 makes a call request. At this time, the radio base station BS1
Notifies the mobile station MS4 that the control channel is allocated to the communication channel. For the wireless mobile station MS5 waiting on this control channel, the control channel is changed to the communication channel by changing the control channel information bit of the signal format of the signal from the wireless base station to the wireless mobile station shown in FIG. You can be notified that it has become. As a result, the radio mobile station MS5 can access the control channel of another base zone and perform location registration, and can make and receive calls in that base zone.

When the control channel is allocated to a communication channel, the control channel of the signal format of the signal from the radio base station to the radio mobile station shown in FIG. By changing the information bits, it can be recognized during communication that the control channel has become a communication channel. Thus, when the control channel is allocated to a communication channel, when a wireless mobile station that is communicating on another communication channel terminates a call, another wireless base station does not access the control channel of that base zone. It is possible to access the base zone.

[0038]

As described above, in the digital mobile communication system according to the present invention, when the control channel is diverted to the communication channel, the control channel is allocated to the communication channel and the effect is obtained during the communication. By notifying and changing the control channel information bit of one signal, the radio mobile station that is in a standby state on the control channel and the radio mobile station that is powered on during control channel communication can scramble the received signal. There is an effect that the control channel communication can be recognized at an early stage without referring to the unraveling error correction code, and another operation can be performed.

When the control channel is diverted to a communication channel, a notification that the control channel is diverted to the communication channel is also sent to the communication channel managed by the control channel. By changing the bit, it is possible to access the control channel of another wireless base station without accessing the control channel when the call is ended.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a digital mobile communication system.

FIG. 2 shows wireless mobile stations MS from wireless base stations BS1 to BSk.
It is a figure which shows the format of the control channel transmitted to 1-MSn.

FIG. 3 shows a radio mobile station MS from radio base stations BS1 to BSk.
It is a figure showing the format of the communication channel transmitted to 1-MSn.

FIG. 4 is a diagram illustrating a state of a frame transmitted from a wireless base station to a wireless mobile station, where all communication channels are in use and are blocked.

FIG. 5 is a diagram illustrating a state of a frame transmitted from the wireless base station to the wireless mobile station, when a call request is issued from the wireless mobile station when all communication channels are in use and are blocked. is there.

FIG. 6 is a diagram illustrating a state of a frame transmitted from the wireless base station to the wireless mobile station, where the control channel is diverted to a communication channel and the wireless mobile station MS4 is communicating.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Control station apparatus 2 Base zone BS1-BSk Wireless base station MS1-MSn Wireless mobile station

Claims (3)

[Claims] 1. A plurality of wireless mobile stations, a plurality of wireless base stations connected to the wireless mobile stations via wireless lines, and a control station capable of connecting the wireless base stations to a plurality of wired telephone lines. And a device for performing communication between the radio mobile station and the radio base station in a time-division multiplexing manner, at least one of a plurality of channels of a radio line as a control channel, and other channels as communication channels. In a digital mobile communication system which is to be used, when all of the communication channels are blocked in the radio base station, when using the control channel as a communication channel, other radio stations waiting for that effect on the control channel. A digital mobile communication system comprising a first notification unit for notifying a mobile station. 2. The method according to claim 1, further comprising the step of: using a control channel as a communication channel, providing a second notification means for notifying the control channel of the control channel through a communication channel managed by the control channel. Digital mobile communication system. 3. The digital mobile communication system according to claim 1, wherein, when the control channel is used as a communication channel, the notification is made by using an unscrambled layer 1 signal. Communications system.