JPH02280425A - Incoming call transfer system in subscriber communication system - Google Patents

Abstract

PURPOSE:To evade the use of meaningless radio communication channel and to utilize the frequency effectively by calling a transfer destination via an idle subscriber line when an incoming call to a mobile station subject to incoming transfer request takes place to connect the incoming subscriber line and the subscriber line used for calling the transfer destination. CONSTITUTION:The system is provided with a means 70 controlling mobile station subscriber information including incoming transfer request information, a means 60 storing transfer destination information for each subscriber, means 70 calling a transfer destination via an idle subscriber line according to the transfer destination information when a call takes place to a station subject to incoming transfer request and means 20, 30, 40 connecting the incoming subscriber line and the subscriber line used for the transfer destination call. When an incoming transfer request is given to a base station 10 of a subscriber communication system while a subscriber is parted from mobile stations 100-1-100-k, a transfer destination number is called to a general subscriber telephone network to attain the communication between a caller and a mobile station subscriber in the transfer destination. Thus, it is evaded that the call is continued till a caller gives up the call.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a call transfer method in a subscriber communication system.

[Prior Art] Conventionally, there are the following subscriber communication systems as means for communicating between a general subscriber telephone network and a mobile station such as a car telephone. This system connects the general subscriber telephone network and a base station via multiple subscriber lines assigned representative numbers, and connects the base station and multiple mobile stations via wireless, Incoming calls from the general subscriber telephone network to the mobile station are connected using the second dial method.

[Problems to be Solved by the Invention] Conventionally, in this type of communication system, incoming calls from the general subscriber telephone network to a mobile station are sent from the switchboard of the general subscriber telephone network to the subscriber line in the form of a ringing signal. to the base station. The base station detects this paging signal, and if there is an empty channel on the wireless transmission path between the base station and the mobile station, it responds to the paging (equivalent to off-hook of a telephone) and connects the general subscriber phone via the subscriber line. A voice or tone is sent to the calling subscriber of the network to prompt the subscriber to send the mobile station subscriber number (second dial number). Then, the mobile station is called by the second dial signal sent according to the voice or tone, and the incoming call is connected by allocating the empty communication channel. For this reason, even when the subscriber is away from the mobile station for a long time and is in another location such as an office, the call channel is monopolized and the call is continued until the caller abandons the call, even when there is no possibility of a response from the mobile station. There was a problem in continuing.

[Means for Solving the Problems] In order to solve the above problems, in the base station of the subscriber communication system according to the present invention, when the subscriber leaves the mobile station for a long time, etc., the mobile station can communicate with the base station. means for requesting call transfer; means for managing mobile station subscriber information including call transfer request information at the base station; means for storing transfer destination information for each subscriber; and a mobile station for which call transfer has been requested. means for calling the transfer destination via an empty winding in accordance with stored transfer destination information when an incoming call to the transfer destination occurs; and means for connecting.

[Embodiment] FIG. 1 is a block diagram showing an embodiment of a subscriber communication system to which the present invention is applied.

In FIG. 1, l is an exchange of the general subscriber telephone network.

The base station 10 of the subscriber communication system is connected to the exchange 1 via subscriber lines #1 to #n to which the representative number of the base station 10 is assigned as the telephone number of the general subscriber telephone network. It becomes possible to make calls between general subscriber telephone networks.

The subscriber line interface circuits 20-1 to 20-0 interface the subscriber lines from the exchange 1 and input/output call connection information such as outgoing/incoming calls, call termination, etc. via the data bus.

The communication path switch 30 transmits n signals (n is a positive integer) from the subscriber line interface circuits 20-1 to 20-0 to m signals on the transmission path between the base station and the mobile station according to the control from the main control unit 70. (m is a positive integer where m < n)
Switch to connect.

The radio interface circuits 40-1 to 40-m interface with the radio transceiver 50, and input and output call connection information such as call origination and call termination information from the mobile station via the data bus.

The storage circuit 60 stores the transfer destination to the general telephone network desired by the subscriber on the mobile station side for an incoming call from the general telephone network to the mobile station.

The main control unit 70 performs management control of the entire subscriber communication system, such as allocation control of communication channels of wireless transmission paths.

100-1 to 100- are mobile stations including mobile communication terminal devices such as car telephones connected to the base station 10 via a wireless transmission path.

In such a subscriber communication system, the mobile station 100
-1 requests transfer of the incoming call to its own station, the mobile station 10
0-1 makes an incoming call transfer request to the base station 10 via a control channel on a wireless transmission path. When a subscriber of the general subscriber telephone network makes an incoming call to this mobile station 1001, he first dials the representative number of the base station 10 and calls the base station 10 of the subscriber communication system. Upon receiving the call instruction to the base station 10, the exchange 1 selects an empty line (for example, #1) from subscriber lines #1 to #n to which representative numbers are assigned, and performs ringing via this subscriber line #1. Send a signal. The subscriber line interface circuit 20-1 of the base station 10, which receives the ringer call from the exchange 1 via the subscriber line #1, notifies the main control unit 70 of the occurrence of the incoming call via the data bus.

When the main control unit 70 receives the notification and is ready to accept the call, it instructs the subscriber line interface circuit 20-1 to respond to the ringer call (off-hook on the telephone) via the data bus. . Upon receiving the instruction, the subscriber line interface circuit 20-1 responds to the ringer call and sends a voice or tone to the calling subscriber to prompt the calling subscriber to send a second dial signal for calling the destination mobile station. is output to subscriber line #1. When the calling party of the general subscriber telephone network receives the voice or tone, it sends a second dial signal to the subscriber line interface circuit 20-1. Subscriber line interface circuit 20
-1 detects the second dial signal and
Send to 0.

The main control unit 70 checks the second dial, and after confirming that the subscriber is a subscriber in its own system, checks whether there is a call transfer request. If there is a request, the general subscriber telephone network transfer destination number is stored in the memory circuit 60. Make sure that it is memorized,
After checking, check whether there is an empty addition winding. If an empty joining winding (for example, #2) exists, the main control unit 70 instructs the subscriber line interface circuit 20-2 to make a call to the forwarding destination number stored in the storage circuit 60, and switches the call path switch. 3
0 for connection to the subscriber interface circuit 201. The general subscriber name interface circuit 20-2 that receives the calling instruction makes a call to the forwarding destination number to the general subscriber telephone network, thereby enabling a call between the caller and the mobile station subscriber at the forwarding destination. becomes.

[Effects of the Invention] As explained above, the subscriber communication system according to the present invention includes means for requesting call transfer from a mobile station to a base station, and means for managing mobile station subscriber information including call transfer request information at the base station. means for storing transfer destination information for each subscriber; and means for storing transfer destination information for each subscriber; and means for storing transfer destination information for each subscriber; and means for storing transfer destination information for each subscriber; By providing a means for calling the forwarding party using the caller, and a means for connecting the incoming subscriber's line and the subscriber's line used for calling the forwarding party, meaningless use of wireless communication channels is eliminated and frequencies are used effectively. It has the effect of realizing

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a subscriber communication system according to the present invention. 1; switchboard of general subscriber telephone network; 10; base station of subscriber communication system; 20-1 to 20-n: subscriber line interface circuit; 30: communication path switch; 40-1 to 40-m
: Radio interface circuit, 50: Radio transceiver, 6
0: Memory circuit, 70: Main control unit, 100-1 to 100-
In: mobile station.

Claims (1)

[Claims] 1. A base station connected to a general subscriber telephone network via a plurality of subscriber lines assigned representative numbers, and a plurality of mobile stations connected to the base station via a wireless transmission path, In a subscriber communication system in which an incoming call is made from a general subscriber telephone network to the mobile station using a second dial method, means for requesting incoming call transfer from the mobile station to a base station; means for managing mobile station subscriber information including; means for storing forwarding destination information for each subscriber; and means for storing forwarding destination information for each subscriber; A subscription characterized by comprising means for calling a transfer destination via an empty joining winding according to transfer destination information, and means for connecting the called subscriber line and the subscriber line used for the transfer destination call. A call transfer method in a personal communication system.