JP2689925B2 - Call rescue method and apparatus for radio channel busy in subscriber radio system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subscriber radio system comprising a base station and a terminal station connected to a subscriber exchange by a subscriber line interface, and more particularly to a call relieving method and apparatus therefor when a radio channel is busy.

[0002]

2. Description of the Related Art A subscriber radio system is composed of a plurality of base stations connected to a subscriber exchange by a subscriber line interface and terminal stations under the control of the base stations. Generally, the number of wireless lines is limited, and disconnection occurs due to wireless channel busy when traffic is concentrated.

FIGS. 5 and 6 are diagrams showing the configurations of a base station and a terminal station of a conventional subscriber radio system.

The subscriber radio system includes a general subscriber line interface circuit 41, as shown in FIGS.
The analog / digital converter 43, the time divisional switch 44, the central controller 45, and the terminal station equipment information manager 47
, A control channel transceiver 48, a transceiver interface 4c, a base station 4B including a transceiver 4d, a transceiver 51, a transceiver interface 52, a time division switch 55, and a control channel transceiver 56. A central controller 58, a subscriber information manager 59, a dial signal receiver 5a, an analog / digital converter 5b,
It is composed of a terminal station 5B including a subscriber circuit 5c and terminals 5e and 5f accommodated in the terminal station 5B.

In the above configuration, when a call is made from the terminals 5e and 5f accommodated in the terminal station 5B, the terminal station 5B sends the dial signal received from the dial signal receiving section 5a to the subscriber information management section 59. The subscriber signal and the terminal station facility information are compared to identify whether the called party is a terminal accommodated in the same terminal station 5B. If the terminal is not accommodated in the same terminal station 5B, the dial signal is the terminal. Station 5B
Is transmitted to the base station 4B via a wireless line. In the case of a call between terminals accommodated in the same terminal station 5B,
The terminal station 5B releases the wireless link with the base station 4B, and the terminal station 5B
A return call is made within the own station via the time division switch unit 55 in B.

[0006]

In the conventional subscriber radio system, the number of radio lines between the terminal station and the base station is limited, and radio channel busy occurs when traffic is concentrated.
In this case, calls between terminals within the same terminal station are possible,
It becomes impossible to talk to a terminal accommodated in a terminal station under the control of another base station or a terminal connected to a wired line.

The object of the present invention is to limit the telephone service in an emergency such as an emergency call by providing a detour route from the terminal station to another base station even if the wireless line between the base station and the terminal station is busy. A call relieving method and a device thereof when a wireless channel is busy in a subscriber wireless system that enables a telephone call.

[0008]

A call relieving method when a radio channel is busy in a subscriber radio system of the present invention includes a base station connected to a subscriber exchange through a general subscriber line, and a base station accommodated in the base station. In a call rescue method when a wireless channel is busy in a subscriber wireless system composed of a plurality of terminal stations, when a wireless line between the terminal station and the base station cannot be used due to a busy condition, etc. A step of selecting a bypass wireless line; a step of determining an incoming call from another terminal station under the control of another base station via the bypass wireless line at the base station due to factors such as radio channel busy; Steps for performing billing processing for calls originating from other terminal stations under its control, and interfacing with a dedicated line for non-billing purposes, and for bypassing radio waves from terminal stations under the control of other base stations. Comprising the step of a non-billing the subscriber exchange as a call by.

Further, the call relieving device at the time of radio channel busy in the subscriber radio system of the present invention is a base station connected to a subscriber exchange through a general subscriber line, and a plurality of base stations accommodated in the base station. In a call relief device at the time of radio channel busy in a subscriber wireless system composed of terminal stations of the above, the base station is provided separately from a general subscriber line interface circuit interfaced via a general subscriber line. Selects an outgoing call-only subscriber line, an uncharged call-only subscriber line interface circuit interfaced with the non-charged call-only subscriber line, and the general subscriber line interface circuit or the non-charged call-only subscriber line interface circuit. A subscriber line interface circuit selection control unit for controlling, and the terminal station under the control of the base station. Due to factors such as a terminal station facility information management unit that manages equipment information and terminal information accommodated in the terminal station and a radio channel busy, etc., a terminal accommodated in another terminal station under the control of another base station to a subscriber exchange via the base station. A billing processing unit that performs billing processing for a call transmitted to a connected terminal via a bypass wireless line, and the other base station when the wireless line with the base station is unavailable to the terminal station. It has a base station selection unit having a function of selecting a detouring wireless line.

Further, the subscriber line interface circuit selection control section has means for activating the non-billing transmission dedicated subscriber line interface circuit to stop the billing process of the subscriber exchange.

[0011]

Further, the terminal station equipment information management section has means for discriminating an incoming call of the bypass radio line from another terminal station under the control of another base station due to factors such as radio channel busy.

[0013]

According to the present invention, in a subscriber radio system including a base station and a plurality of terminal stations, when a call cannot be made due to radio channel busy, a bypass radio line to another base station is selected and connected to make a bypass. By performing a charging process for a call transmitted via a wireless line and selectively controlling the call from a terminal station under the control of another base station as a call through a bypass wireless line, the call when the wireless channel is busy is relieved.

[0014]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a base station configuration diagram of a subscriber radio system according to an embodiment of the present invention, FIG. 2 is a terminal station configuration diagram of the same, and FIG. 3 is a subscriber radio system system configuration diagram of an embodiment of the present invention. 4 shows a base station block diagram of a subscriber radio system according to another embodiment of the present invention. The same reference numerals indicate the same objects throughout the drawings.

The base station 4 of the embodiment shown in FIG. 1 does not perform charging processing in the general subscriber line interface circuit 41 interfaced with the subscriber exchange 1 and the general subscriber line 2, and in the subscriber exchange 1. As a line only for non-billing transmission
A subscriber line interface circuit 42 dedicated to non-billing transmission, which is interfaced through the subscriber line 3 , an analog / digital converter 43 for converting an analog signal into a digital signal or a digital signal into an analog signal, converted voice data, etc. A time division switch unit 44 having a function of multiplexing / demultiplexing and a switching switch function, a central control unit 45 having a main control function of the base station 4, and a base station 4
A terminal station facility information management unit 47 that manages facility information such as a terminal station number and the subscriber information of terminals accommodated in the terminal station 5, and control from the terminal station facility information management unit 47. A subscriber line interface circuit selection control unit 46 for controlling whether the general subscriber line interface circuit 41 or the non-billing transmission dedicated subscriber line interface circuit 42 is activated according to the information and controlling the circuit, and a terminal. A billing processing unit 49 that performs billing processing when there is a billing request instruction in the station facility information management unit 47, a control channel transceiver 48 that transmits and receives control information to and from the terminal station 5, a transceiver interface unit 4c, and a transceiver. Four
d.

The terminal station 5 of the embodiment shown in FIG.
And a subscriber circuit 5 for connecting 5f through a general subscriber line 5d
c, an analog / digital converter 5b for converting an analog signal such as voice data into a digital signal or a digital signal into an analog signal, and a dial signal receiver 5a for receiving dial signals of outgoing calls from the terminals 5e and 5f.
A time division switch unit 55 having a multiplexing / demultiplexing function and an exchange switch function for voice data converted by the analog / digital conversion unit 5b, and a central control unit 58 having a main control function for the terminal station 5. A subscriber information management unit 59 for managing subscriber information such as service class and accommodation position information of terminals accommodated in the terminal station 5, and a central control unit 58.
At the base station selecting unit 57 for selecting the radio line 6 or the detour radio line 7 depending on the availability of the radio line, a control channel transmitting / receiving unit 56 for transmitting / receiving control information to / from the base station 4, and a transceiver interface unit 52. And a transceiver 51 for transmitting / receiving voice data / control data to / from the base station 4 via a wireless line.

In the embodiment of the present invention shown in FIG. 3, the base station 4 described above, a base station 4A having the same configuration, the terminal station 5 described above,
The terminal station 5A has the same configuration.

The base station 4 of another embodiment shown in FIG.
The subscriber line interface circuit selection controller 46 shown in FIG.
However, the subscriber line interface circuit 42 for exclusive use of non-charged transmission
1 is that it only controls by selecting whether or not to activate
And different.

Next, the operation of the embodiment will be described. For example, the terminal 5Ae accommodated in the terminal station 5A makes a call to the terminal 5g which is interfaced to the subscriber exchange 1 by the general subscriber line 2, but the wireless line 6A between the base station 4A and the terminal station 5A is busy. There is. Terminal station 5A is terminal 5
The dial signal received from Ae is received by the dial signal receiving unit 5a, and the wireless line 6A is set to the base station 4A, but the central control unit 58 and the base station selecting unit 57 are used.
When it is determined that the wireless line 6A is busy, the base station selecting unit 57 instructs the control channel transmitting / receiving unit 56 to make a detour to the detouring wireless line 7 and sets a detour route to the base station 4 for call relief. To do.

On the other hand, in the base station 4, when there is an incoming call from the terminal station 5A via the bypass radio line 7, the terminal station number received from the control channel transmitting / receiving section 48 is discriminated by the terminal station equipment information managing section 47. However, if it is determined that the incoming call is the detour route, the subscriber line interface circuit selection control unit 46
At the same time as instructing the non-billing outgoing leased line interface circuit 42 to start, the billing processing section 49 is instructed to execute the billing processing, and the billing processing in the subscriber exchange 1 is not billed for the incoming call on the detour route. Then, the base station 4 performs the charging process. As described above, call relief when the wireless line is busy is possible.

[0022]

As described above, according to the present invention, even when the wireless line between the terminal station and the base station is busy, the terminal station is provided with the bypass wireless line through another base station to enable a call. On the other hand, on the other hand, the base station side has the effect of enabling call relief by performing the charging process for the incoming call from the terminal station on the detour route.

[Brief description of the drawings]

FIG. 1 is a block diagram of a base station of a subscriber wireless system according to an embodiment of the present invention.

FIG. 2 is a terminal station configuration diagram of a subscriber wireless system according to an embodiment of the present invention.

FIG. 3 is a system configuration diagram of a subscriber wireless system according to an embodiment of the present invention.

FIG. 4 is a block diagram of a base station of a subscriber radio system according to another embodiment of the present invention.

FIG. 5 is a base station configuration diagram of a subscriber wireless system according to a conventional example.

FIG. 6 is a terminal station configuration diagram of a subscriber wireless system according to a conventional example.

[Explanation of symbols]

 1, 1A Subscriber switch 2, 2A General subscriber line 3, 3A Non-charged transmission dedicated subscriber line 4, 4A, 4B Base station 41 General subscriber line interface circuit 42 Non-charged transmission dedicated subscriber line interface circuit 43, 5b Analog / digital conversion unit 44, 55 Time division switch unit 45, 58 Central control unit 46 Subscriber line interface circuit selection control unit 47 Terminal station equipment information management unit 48, 56 Control channel transmission / reception unit 49 Charging processing unit 4a, 53 Voice channel 4b, 54 Control channels 4c, 52 Transceiver interface section 4d, 51 Transceiver 57 Base station selection section 59 Subscriber information management section 5a Dial signal receiving section 5c Subscriber circuit 5d, 5Ad General subscriber line 5e, 5f, 5Ae, 5Af, 5g Terminal 6, 6A Wireless line 7 Detour wireless line

Claims (4)

(57) [Claims] 1. A call when a radio channel is busy in a subscriber radio system including a base station connected to a subscriber exchange through a general subscriber line and a plurality of terminal stations accommodated in the base station. In the rescue method, when the wireless line between the terminal station and the base station is busy and the like cannot be used, a step of selecting a bypass wireless line to another base station, and a factor such as a wireless channel busy at the base station The step of determining an incoming call from another terminal station under the control of another base station via the bypass radio line, the step of performing charging processing for the call transmitted from the other terminal station under the control of the other base station, and No subscriber, characterized by having a step of interfacing with a dedicated line and not charging the subscriber switch as a call from a terminal station under the control of another base station via a bypass radio line Call saving method for the wireless channel busy in the system. 2. A call when a radio channel is busy in a subscriber radio system including a base station connected to a subscriber exchange through a general subscriber line and a plurality of terminal stations accommodated in the base station. In the rescue device, a non-billing transmission dedicated subscriber line provided separately from the general subscriber line interface circuit interfaced to the base station via the general subscriber line, and an interface to the non-billing transmission dedicated subscriber line. A non-billing transmission-dedicated subscriber line interface circuit, a subscriber line interface circuit selection control unit that selectively controls the general subscriber line interface circuit or the non-billing transmission-dedicated subscriber line interface circuit, and the subordinate subordinate station Terminal station equipment information management for managing terminal station equipment information and terminal information accommodated in the terminal station Due to factors such as radio channel busy and the like, charging processing is performed for calls originating from terminals under the control of other base stations accommodated by other terminal stations to terminals connected to the subscriber exchange via the base stations via the bypass radio line. A charging processing unit and a base station selecting unit in the terminal station, which has a function of selecting a bypass wireless line to the other base station when the wireless line with the base station cannot be used due to busy or the like. A call rescue device when a wireless channel is busy in a subscriber wireless system. 3. The subscriber radio according to claim 2, wherein the subscriber line interface circuit selection control unit has means for activating the subscriber line interface circuit dedicated to non-billing transmission and stopping the billing process of the subscriber exchange. Call relief device when the wireless channel is busy in the system. 4. The terminal station equipment information management unit has means for discriminating an incoming call of a bypass radio line from another terminal station under control of another base station due to factors such as radio channel busy.
A call relieving device when a wireless channel is busy in the subscriber wireless system according to claim 2 or 3 .