JPH0723448A - Control channel changeover system for mobile communication - Google Patents

Abstract

PURPOSE:To provide the talking service to an analog mobile terminal equipment and a digital mobile terminal equipment and to improve the reliability of service without stopping a call connection function of a radio base station when a fault takes place in the control channel by providing at least two active equipments having a function of analog and digital signal transmission reception so as to provide the speech service to an analog mobile terminal equipment and a digital mobile terminal equipment. CONSTITUTION:This system is provided with 1st and 2nd equipments 4, 5 sending/receiving at least two analog and digital control signals among plural mobile terminal equipments to set up the speech service of an analog signal or a digital signal, with a standby control channel device 6 for the 1st and 2nd equipments 4, 5, and a controller 3 monitoring the state of the 1st and 2nd equipments 4, 5 and the standby control channel device 6, and when a fault takes place in the 1st equipment 4 and the standby control channel device 6, the 2nd equipment 5 is acted like an analog control channel device under the control of the controller 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control channel for switching between two devices for transmitting and receiving analog and digital control channel signals provided in a radio base station in a mobile communication system and a device for a spare control channel. Regarding switching method.

[0002]

2. Description of the Related Art In a conventional control channel switching system in a mobile communication system, a regular primary control channel device, a regular secondary control channel device and a spare control channel device are arranged in one radio base station. Here, the functions of the primary control channel device are a mobile terminal (hereinafter referred to as an analog mobile terminal) that transmits and receives data during voice and a call by analog transmission, and a mobile terminal that transmits and receives data during a voice and a call by digital transmission. It is used for transmitting initial setting information before establishing a call for both terminals (hereinafter referred to as digital mobile terminals) and for transmitting a control signal for establishing a call between an analog mobile terminal and a digital mobile terminal. Also, the function of the secondary control channel device is used only for transmitting control signals for establishing a call of the digital mobile terminal. Therefore, the analog mobile terminal and the digital mobile terminal need either the primary or secondary control channel device for receiving the initial setting information before the call is established. Further, the function of the spare control channel device has both the function of the primary or secondary control channel device, and if either the primary or secondary control channel device fails, it is switched to the spare control channel device and rescued. Was.

[0003]

In this conventional control channel switching system, when a failure occurs in both the regular primary control channel device and the standby control channel device at the same time, the radio base station establishes a call. Since the signal transmission / reception of 1) is stopped, there is a drawback that the call service cannot be provided to the analog mobile terminal and the digital mobile terminal.

[0004]

A control channel switching system for mobile communication according to the present invention comprises at least two analog and digital controls for establishing a call service of analog signals or digital signals between a plurality of mobile terminals. First and second devices for transmitting and receiving signals, spare control channel devices for the first and second devices, and control device for monitoring the states of the first and second devices and the spare control channel device And the second device is operated as an analog control channel when a failure occurs in the first device and the spare control channel device under the control of the control device.

[0005]

The present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a control channel switching processing flow and control channel states of the embodiment of FIG.

In FIG. 1, common analog / digital control channel devices (hereinafter referred to as ADC devices) 4 and 5 of the radio base station 2 are both the common primary control channel device described in the conventional example and the common secondary control device. It has a function. Therefore, since it has substantially the same function as the spare control channel device 6 of the conventional example, it can be a spare device as needed by the switching control of the main controller 3 described later. Further, in order to transmit analog signals and digital signals from the mobile telephone switching center 1, a plurality of analog call channel devices 7-1 to 7-
n and a plurality of digital speech channel devices 8-1
~ 8-m. The mobile telephone switching center 1 is connected to the main control unit 3 via the signal line 9 and the analog communication channel devices 7-1 to 7-n and the digital communication channel devices 8-1 to 8-m via the communication path 10. It is connected to the.
The ADC units 4 and 5, the spare control channel unit 6, the plural analog speech channel units 7-1 to 7-n and the plural digital speech channel units 8-1 to 8-m are connected to the main control unit 3 by the signal line 11. In addition to being connected, the signal line 12 is connected to the antenna 13. Here, the main control device 3 has a function of constantly monitoring the states of the ADC devices 4 and 5 and the spare control channel device 6 and detecting a failure occurrence and a failure recovery. The main control unit 3 informs the mobile telephone exchange 1 of the occurrence and restoration of these faults via the signal line 9.
Report to

The mobile telephone switching center 1 always manages the state of the control channel device of the radio base station 2 by receiving these fault occurrence and fault recovery report signals.

As shown in FIG. 2, the operation of the embodiment shown in FIG. 1 is such that the ADC device 4 and the ADC device 5 are in operation, and the spare control channel device 6 is in a standby state. If it occurs, a failure of the ADC device 4 (I)
The mobile telephone switching center 1 which has recognized the above-mentioned causes the operation of the ADC device 4 to be stopped, and the backup control channel device 6 to be turned off.
A control channel switching instruction (II) is transmitted to the main control device 3 via the signal line 9 so that the DC device 4 operates as a channel. Receiving the control channel switching instruction (II), the main control device 3 transmits an operation stop instruction to the ADC device 4 via the signal line 11, and sends an operation instruction to operate as the ADC channel to the spare control channel device 6. Send over line 11. AD that received the operation stop instruction
The C device 4 stops the wireless output, and the standby control channel device 6 that has received the operation instruction starts operating as an ADC channel, and the state of the control channel device changes from state (a) to state (b).

After that, when a failure occurs in the backup control channel device 6 as in the state (c), the mobile telephone switching center 1 that recognizes the failure occurrence (III) of the backup control channel device 6 fails. A control channel switching instruction (IV) is transmitted to the main control device 3 via the signal line 9 in order to stop the operation of the generated standby control channel device 6 and continue to operate the ADC device 5 as the ADC control channel. To do. The main controller 3, which has received the control channel switching instruction (IV), transmits an operation stop instruction to the backup control channel apparatus 6 via the signal line 11, and also issues an operation instruction to continuously operate as the ADC control channel. To the signal line 11. The standby control channel device 6 that has received the operation stop instruction stops the wireless output, and the ADC device 5 that has received the continuous operation instruction operates as the ADC control channel and shifts from state (b) to state (c).

After that, when the failure of the ADC device 4 is recovered, the mobile telephone switching center 1 which recognizes the failure recovery (V).
Sends a control channel switching instruction (VI) to main controller 3 via signal line 9 in order to operate ADC device 4 as an ADC control channel and operate ADC device 5 as an ADC control channel. The main controller 3, which has received the control channel switching instruction (VI), transmits an operation instruction to operate as the ADC control channel to the ADC device 4 via the signal line 11, and also transmits an operation instruction to operate as the ADC control channel. Signal line 1 to 5
1 to send. ADC device 4 that received the operation instruction
And 5 start operating as the ADC control channel, and the state of the control channel shifts from state (c) to state (d). Further, when both the ADC device 4 and the spare control channel device 6 are in a failure state, the spare control channel device 6 is
When the failure is recovered first, the ADC device 5 is replaced by a spare A
It operates as a DC control channel.

In the present embodiment, the switching process is described in which the faults occur in the order of the ADC device 4 occurring first, and the spare control channel device 6 occurring later. The generation of the spare control channel device 6 precedes the ADC
The same applies to the case where the device 4 is generated later.

[0013]

As described above, the present invention stops the call connection function by the control channel of the wireless base station when a failure occurs in the control channel device by providing the active device having both analog and digital functions. Without doing so, the call service is provided to the analog mobile terminal and the digital mobile terminal, and the service reliability is improved.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the embodiment of FIG.

[Explanation of symbols]

1 Mobile Telephone Switching Office 2 Radio Base Station 3 Main Controller 4,5 Analog / Digital Control Channel Device (A
DC device) 6 spare control channel device 7-1 to 7-n analog speech channel device 8-1 to 8-m digital speech channel device 9, 11, 12 signal line 10 speech path 13 antenna

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H04Q 7/26 7/30

Claims (2)

[Claims] 1. First and second devices for transmitting and receiving at least two analog and digital control signals for establishing a call service of analog signals or digital signals with a plurality of mobile terminals; and the first and second devices. A spare control channel device for a second device; and a control device for monitoring the states of the first and second devices and the spare control channel device, the first device being controlled by the control device. When a failure occurs with the spare control channel device,
A control channel switching system for mobile communication, wherein the second device is operated as an analog control channel. 2. When the failure of the first apparatus or the spare control channel apparatus is recovered, the control channel apparatus which has recovered from the failure is operated as an analog control channel, and the second apparatus is operating as an analog control channel. The control channel switching system for mobile communication according to claim 1, wherein the control channel switching system is operated as a digital control channel.