JPH04324794A - Exchange for mobile body communication - Google Patents

Abstract

PURPOSE:To reduce a call connection time by sending a signal of a radio control channel in a same radio zone and a signal of a radio talking channel in a same frame phase. CONSTITUTION:Speech channel control trunks 10a, 10b corresponding to radio zones 7a, 7b are respectively connected to control channel controlling trunks 9a, 9b by signal lines 11a, 11b and receive a reference clock synchronously with a radio control channel signal. A reference clock sent from the trunks 9a, 9b forms one multi-frame, then the reference clock shares one period for one multi-frame. A mobile station 8 receives a control signal for channel command through the radio control channel from the trunk 9a and switch over its own frequency to a frequency of a commanded radio speech channel. The trunk 10a sends the signal synchronously with the reference clock received from the trunk 9a via the signal line 11a.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication exchange for a mobile communication system such as a car telephone system.

0002

2. Description of the Related Art FIG. 4 is a block diagram showing a mobile communication system using a conventional mobile communication switch. In the figure, 1 is a mobile communication exchange, 2 is a time division switch as a switch network of the mobile communication exchange 1, and 3 is a processor as a control device that controls the entire mobile communication exchange 1. unit (hereinafter referred to as CPU).

4a is connected to the time division switch 2, and C
This is a communication channel control trunk corresponding to a wireless zone 7a, which will be described later, which is controlled by the PU 3, and 4b is a communication channel control trunk corresponding to the wireless zone 7b. 5a is a control channel control trunk corresponding to a wireless zone 7a to be described later, which is controlled by the CPU 3, and 5b is a control channel control trunk corresponding to the wireless zone 7b.

Reference numeral 6a denotes a relay radio device connected to the communication channel control trunk 4a or the control channel control trunk 5a. Reference numeral 6b is a relay radio device connected to the communication channel control trunk 4b or the control channel control trunk 5b.

7a is a wireless zone formed by the relay wireless device 6a, and 7b is a wireless zone formed by the relay wireless device 6b. 8 is a mobile station that moves and communicates within this wireless zone 7a or 7b.

Next, the operation will be explained. Here, Figure 5
is an explanatory diagram showing the format of a radio control channel signal and a radio call channel signal sent from the mobile communication exchange 1, and FIG. 3 shows a connection sequence until an incoming call to the mobile station 8 is connected. FIG.

[0007] If there is an incoming call to the mobile station 8 whose location is registered in the wireless zone 7a, the CPU 3 controls the control channel control trunk 5a to change the wireless zone to which the relay wireless device 6a is transmitting. A control signal instructing the mobile station 8 to receive an incoming call is sent to the downlink radio control channel 7a.

[0008] When the mobile station 8 is idle, it synchronizes its frame with the constantly transmitted radio control channel signal of the radio zone 7a, but when it detects an incoming call instruction for its own station in the control signal of the radio control channel. , returns an incoming call response signal to the control channel control trunk 5a on the upstream channel of the wireless control channel.

The control channel control trunk 5a that has received this incoming call response signal sends a channel instruction control signal specifying the wireless communication channel to be used for the call to the mobile station 8 on the downlink channel of the wireless control channel. Send to. At the same time, the control channel control trunk 5a notifies the CPU 3 that there is a response to the incoming call.

[0010] Upon receiving the notification, the CPU 3 notifies the corresponding communication channel control trunk 4a that there is an incoming call response, and the communication channel control trunk 4a that receives the notification sends a notification to the downlink channel of the wireless communication channel. The mobile station 8
Send a confirmation signal (control signal) to the destination.

When the mobile station 8 receives a channel instruction control signal on the radio control channel, it switches its own frequency to the frequency of the instructed radio communication channel. At this time, as shown in FIG. 5, the frame phase of the radio control channel and the frame phase of the radio communication channel do not match, so the mobile station 8 first matches the frame synchronization and pulls in the synchronization.

When the mobile station 8 is able to acquire synchronization, it goes to receive a confirmation signal from the communication channel control trunk 4a, and when the confirmation signal is received, it sends a confirmation signal to the communication channel control trunk 4a on the upstream channel of the wireless communication channel. Sends back an acknowledgment signal. Trunk 4a for voice channel control
When receiving this confirmation response signal, the mobile station 8 enters a conversation state and starts transmitting and receiving audio to and from the mobile station 8.

[0013]

[Problem to be Solved by the Invention] Since the conventional mobile communication exchange 1 is configured as described above, when the mobile station 8 switches the channel from the radio control channel to the radio communication channel, the frame synchronization is lost once. There was a problem in that communication had to be performed after re-induction, which increased the call connection time.

[0014] The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a mobile communication exchange that does not require re-establishing frame synchronization when switching from a radio control channel to a radio communication channel. With the goal.

[0015]

[Means for Solving the Problems] A mobile communication exchange according to the present invention changes the frame phase of a signal of a wireless communication channel by a communication channel control trunk to a wireless communication channel by a control channel control trunk corresponding to the same radio zone. This is made to match the frame phase of the control channel signal.

[0016]

[Operation] The mobile communication exchange according to the present invention transmits the radio control channel signal and the radio communication channel signal in the same radio zone in the same frame phase, thereby transferring the channel from the radio control channel to the radio communication channel. Eliminates the need to re-establish frame synchronization when switching between
To realize a mobile communication switch that can shorten call connection time.

[0017]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a mobile communication exchange, 2 is a time division switch as a switch network, 3 is a CPU as a control device, 6a and 6b are relay radio devices, 7a and 7b are radio zones, and 8 is a mobile station. Since these parts are the same as or equivalent to those of the conventional system denoted by the same reference numerals in FIG. 4, detailed explanation will be omitted.

Reference numerals 9a and 9b are control channel control trunks corresponding to the wireless zone 7a or 7b, which are controlled by the CPU 3, and have a function of transmitting a reference clock synchronized with the signal of its own wireless control channel. , is different from the control channel control trunks labeled 5a and 5b in FIG.

Reference numerals 10a and 10b are communication channel control trunks corresponding to the wireless zone 7a or 7b, which are accommodated in the time division switch 2 and controlled by the CPU 3, and are based on the reference clocks sent out by the control channel control trunks 9a and 9b. This trunk is different from the communication channel control trunks labeled 4a and 4b in FIG. 4 in that it has a function of synchronizing its own wireless communication channel signal with the communication channel.

11a and 11b connect between the control channel control trunk 9a and the traffic channel control trunk 10a, or between the control channel control trunk 9b and the traffic channel control trunk 10b, and transmit the reference clock. It is a signal line.

Next, the operation will be explained. Here, Figure 2
1 is an explanatory diagram showing the formats of a radio control channel signal and a radio communication channel signal sent from the mobile communication exchange 1, and the relationship between them and a reference clock. FIG.

The communication channel control trunk 10a corresponding to the radio zone 7a is connected to the control channel control trunk 9a by a signal line 11a, and receives a reference clock synchronized with the radio control channel signal. Similarly, the communication channel control trunk 10 corresponding to the wireless zone 7b
b also connects the control channel control trunk 9b with the signal line 11b.
and receives a reference clock synchronized with the radio control channel signal.

The control channel control trunks 9a, 9
The reference clock sent from b is configured to have one period in one multiframe. That is, in the example shown in FIG. 2, one frame has 256 bits, and 10 frames constitute one multiframe, so this reference clock has one cycle every 2560 bits.

Here, for example, the basic operation until an incoming call is connected to the mobile station 8 whose location is registered in the wireless zone 7a is as shown in the timing diagram of FIG. 3, as in the conventional case. Proceed according to the sequence. Therefore, mobile station 8
receives a channel instruction control signal on the wireless control channel from the control channel control trunk 9a in the same way as in the conventional case, and switches its own frequency to the frequency of the specified wireless communication channel.

At this time, the communication channel control trunk 10
a transmits the wireless communication channel signal via the signal line 11a in synchronization with the reference clock received from the control channel trunk 9a. Therefore, the frame phase of the radio communication channel matches the frame phase of the radio control channel.

Therefore, the mobile station 8 uses the traffic channel control trunk 4a without re-establishing frame synchronization.
You can go and receive a confirmation signal from. When the mobile station 8 receives the confirmation signal, it sends an acknowledgment signal back to the communication channel control trunk 10a through the wireless communication channel.

The communication channel control trunk 10a that has received this confirmation response signal enters a communication state and starts transmitting and receiving audio to and from the mobile station 8.

[0028]

As described above, according to the present invention, the radio control channel signal from the control channel control trunk in the same radio zone and the radio communication channel signal from the communication channel control trunk can be made the same. Since it is configured to transmit data with a frame phase of There are benefits to be gained.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a mobile communication switch according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the formats of the wireless communication channel signal and the wireless control channel signal, and the relationship between them and a reference clock.

FIG. 3 is a timing diagram showing the operation sequence of the above embodiment and the conventional mobile communication exchange.

FIG. 4 is a block diagram showing a conventional mobile communication switch.

FIG. 5 is an explanatory diagram showing the format of the wireless communication channel signal and the wireless control channel signal.

[Explanation of symbols]

1 Mobile communication exchange 2 Switch network (time division switch) 3 Control device (CPU) 6a, 6b Relay wireless device 7a, 7b Wireless zone 8 Mobile station

Claims (1)

[Claims] 1. A control channel control trunk connected to a relay radio device that transmits and receives radio control channel signals in a digital frame format within a predetermined radio zone; Accommodates communication channel control trunks connected to each relay radio device that transmits and receives signals of a plurality of wireless communication channels in digital frame format within the zone, and the communication channel control trunks. a switch network for controlling the control channel;
In a mobile communication switching system comprising the communication channel control trunk and a control device that controls the switch network and connects a mobile station moving within the wireless zone to a predetermined communication partner, For mobile communication, characterized in that a frame phase of a signal of a radio control channel by the control channel control trunk corresponding to a zone is made to match a frame phase of a signal of a radio communication channel by the trunk for communication channel control. switch.