JPH04107093A - Radio communication system - Google Patents

Abstract

PURPOSE:To make it unnecessary to mount a loop back trunk exclusive for a simplex connection by providing a switch for changing a speech path with a voice repeating trunk between a radio base station and a switchboard, an switching this switch by a call connection type. CONSTITUTION:When a radio terminal 2 calls to a radio terminal 3, a switchboard control device 12 knows from a dial number that a connecting destination is a radio terminal, that is the simplex connection, and the speech path of a voice repeating trunk 7 planning to be used in this call is connected like the solid line of a diagram (a speech path 7C). At the same time, the radio terminal 3 is called through a radio control channel. After the radio terminal 3 responds, a radio communication channel 4C and a voice repeating line 6A are connected, and a communication radio channel 4D and a voice repeating line 6B are connected.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wireless communication system, and particularly to a wireless communication system that uses simplex connection when communicating between wireless terminals, and duplex connection when communicating between wireless terminals and general telephone terminals. Regarding communication systems.

[Conventional technology]

Conventionally, this type of wireless communication system has always been equipped with a return trunk dedicated to simplex connections in the exchange, and when a simplex connection is made,
The voice goes through a switch in the exchange and is looped back on this dedicated loopback trunk.

[Problem to be solved by the invention]

The above-mentioned conventional wireless communication system has the disadvantage that it does not have the function of looping back from the uplink path to the downlink path only when a simplex connection is requested, so a loopback trunk exclusively for simplex connection must always be provided. be.

[Means to solve the problem]

The wireless communication system of the present invention is a wireless communication system in which a simplex connection is made when a call is made between wireless terminals, and a duplex connection is made when a call is made between a wireless terminal and a general telephone terminal. and a means provided in the voice relay trunk between the radio base station and the exchange to switch between loopback and relay of the call path depending on the type of simplex connection or duplex connection.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a system configuration diagram showing an embodiment of the present invention. The wireless terminals 1, 2.3 are wireless terminals capable of making duplex calls and simplex calls using press talk. Wireless terminals 1 and 2
．． 3 is connected to the wireless base station 5 via the wireless communication channel 4. The wireless base station 5 has a voice relay line 6. It is connected to an exchange 8 via a voice relay trunk 7, and relays the wireless communication channel 4. This voice relay trunk 7 has a communication path changeover switch that turns the up communication path back to the down communication path, and the wireless terminals 1, 2.3
In the case of a simplex call between two parties, the uplink call path is looped back to the downlink call path under the control of the exchange control device 12 (solid line in the figure), and in the case of a duplex call between the wireless terminals 1, 2.3 and the general telephone terminal 11, The exchange 8 relays voice between the wireless base station 5 and the exchange 8 (dashed line in the figure).The exchange 8 also has a public network interface/ It is connected via trunk 9. The exchange control device 12 controls call connections. The radio base station control device 13 connects to the exchange control device 12 via the control line 14.
It is connected to and sends and receives call contact information.

Next, regarding duplex connection, wireless terminal l connects to general telephone terminal 1.
The case where a call is made to 1 will be explained as an example.

When the wireless terminal 1 makes a call to the general telephone terminal 11, the dial number of the general telephone terminal 11 is transmitted from the radio base station RIITM device 13 to the exchange control device 12 via the control line 14. The exchange control device 12 learns from this received dial number that the connection destination is a general telephone terminal, and sets the communication path of the voice relay trunk 7 to be used for this call as shown by the broken lines (communication paths 7A, 7B) in the figure. Connect to. At the same time, the general telephone terminal 11
When the general telephone terminal 11 responds to the call, the general public network interface trunk 9 detects the response, and the exchange control device 12 allocates a wireless communication channel to the wireless base station control device 13 via the control line 14. 6
In this embodiment, wireless communication channels 4A and 4B are used. In order to relay this unique wireless communication channel, the voice relay line 6A and the communication path 7A are connected at the leap between the wireless base station 5 and the exchange 8, and the voice relay line 6B and the communication path 7A are connected.
B is connected.

In this case, the voice of the wireless terminal operator is transmitted to wireless communication channel 4.
It is relayed as follows: A→radio base station 5→voice relay line 6A→call path 7A→exchange 8—partial public network interface/trunk 9→general public network 10→general telephone terminal 11.

The voice of the general telephone terminal 11 is transmitted from the general public network 10 to the general public network 10 to the general public network interface trunk 9 to the exchange 8 to the communication path 7B to the voice relay line 6B to the wireless base station 5 to the wireless communication channel 4B. It is possible to make duplex calls by relaying as follows.

Next, a case where the wireless terminal 2 makes a phone call with the wireless terminal 3 will be described as an example of simple communication.

When the wireless terminal 2 makes a call to the wireless terminal 3, the exchange control device 12 learns from the dialed number that the destination is the wireless terminal, that is, it is a simplex connection, and calls the wireless terminal 3. Connect the communication path of the voice relay trunk 7 to be used as shown by the solid line (communication path 7C) in the figure. At the same time, the wireless terminal 3 is called via the wireless control channel, and after the wireless terminal 3 responds, the wireless communication channel 4C and the audio relay line 6A are connected, and the wireless communication channel 4D and the audio relay line 6B are connected, as described above. are connected.

In this case, the call is a press talk method, and when the wireless terminal 2 speaks, the wireless communication channel 4C → the wireless base station 5
→Voice relay line 6A→Call path 7C→Voice relay line 6B→
The audio is relayed from the wireless base station 5 to the wireless communication channel 4F. Also, when the wireless terminal 3 speaks,
It is relayed in the same manner as above using the corresponding wireless communication channels 4B and 4D.

〔Effect of the invention〕

As explained above, the present invention provides a switch for switching the call path in the voice relay trunk between the wireless base station and the switching center, and by switching this switch depending on the type of call connection, it is possible to eliminate the need for a return trunk dedicated to simplex connections. effective. This is especially useful when there is a limit to the number of installed trunks, such as when the system configuration is not small-scale, and there is no need to implement loopback trunks dedicated to simplex connections, so instead, general public network interface trunks can be implemented. , the trunk can be used effectively.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram showing an embodiment of the present invention. 1.2.3...Wireless terminal, 4.4A, 4B, 4C, 4
D, 4E, 4F... Wireless communication channel, 5... Wireless base station, 6, 6A, 6B... Voice relay line, 7...
・Voice relay trunk, 7A, 7B, 7C... call path,
8... Exchange, 9... General public network interface/trunk, 10... General public network, 11... General telephone terminal, 12... Switch control device, 13... Radio base station control device , 14... control line.

Claims (1)

[Claims] In a wireless communication system in which a simplex connection is made when a call is made between wireless terminals, and a duplex connection is made when a call is made between a wireless terminal and a general telephone terminal, a means for determining whether a simplex connection or a duplex connection is made from a called party number, and a wireless A wireless communication system characterized by having means provided in a voice relay trunk between a base station and an exchange for switching between loopback and relay of a call path depending on the type of simplex connection or duplex connection.