JP2679438B2 - Mobile phone in-call zone switching method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention switches a call zone when a mobile station in a call in one radio zone formed by a plurality of radio base stations accommodated in a mobile radio switch moves to another radio zone. The present invention relates to a mobile phone call zone switching method for continuing a call.

[0002]

2. Description of the Related Art Conventionally, in this type of mobile phone call zone switching system, a base station detects a decrease in the communication level from the mobile station, notifies the exchange, and the exchange measures the level to a peripheral station around the base station. As a result of the instruction, one base station is selected based on the received measurement value, and each of the base station and the low level notification base station is instructed to switch the channel.

This will be described with reference to FIGS. 3 and 5. FIG. 3 is a relay system diagram showing an example of a mobile communication system, and FIG. 5 is a procedure diagram showing an example of a conventional technique according to FIG. (For example, Electronic Information and Communication Handbook, edited by The Institute of Electronics, Information and Communication Engineers, 1988 edition P2189).

As shown in FIG. 3, mobile unit 10 in zone A
Has a speech path from the base station A21 to the partner device 50 through the exchange 30 and the fixed telephone network 40, and when moving to the zone B, the base station A21 is switched to the base station B22 and connected to the exchange 30.

A radio line 70 is provided between the mobile station 10 and the base stations A21 and B22, and the base stations A21 and B22 and the exchange 30 are connected.
Wired lines 60 are connected between the two. The wired line 60 includes a call path 61 and a control path 62, while the wireless line 70 also has a call path and a control path, which are not shown.

The communication path from the exchange 30 to the partner's machine 50 is fixed unchanged as before even when the zone is switched by the movement of the mobile unit 10.

The zone switching due to the movement of the mobile unit 10 is executed by the base station A21 and the base station B22 which exchange information with each other via the exchange 30 and the control path, for example, by the common line signaling method.

Next, FIG. 5 will be described with reference to FIG. As shown in FIG. 5, the mobile device 10 is in a call on the communication path from the base station A21 in the zone A to the exchange 50 to the partner device 50.

The base station A21 measures the reception level from the mobile unit 10 moving from the zone A to the zone B, and when it detects (201) that the level is lower than the specified value, the base station A21 sends the level drop information to the exchange 30 on the control path. Notification with 10 data (20
2) Do it.

Upon receiving the notification of the procedure 202, the exchange 30 searches the peripheral station of the base station A21 using the data of the mobile station 10 (203) and retrieves the level measurement instruction including the channel information during the call of the mobile station 10. Send to surrounding base stations (2
04).

Upon receiving the level measurement instruction, the peripheral base stations measure the reception level according to the instruction (205), and each base station reports the measured value to the exchange 30 via the control path (20).
6) Yes.

The exchange 30 selects one base station B22 from the base stations having the highest level of the measured value, selects one communication channel (207), and instructs the base station A21 to switch the communication channel. Is notified via the control path (208) while the new communication channel is notified to the base station B22 (211).

When the base station A21 receives the notification of the switching command in step 208, the base station A21 transmits a communication channel switching command to the mobile unit 10 via the wireless channel (209) to switch the channel (210).

The base station B22 connects the new communication channel received in step 211 from the mobile station 10 to the exchange 30, and measures the reception level from the mobile station 10 to confirm that the reception level has exceeded the specified value. When the confirmation is made (212), the completion of the switching of the communication channel is known, and the switching completion is notified (213) to the exchange 30.

Upon receiving the switching completion notice, the exchange 30 switches and connects the speech path connected from the mobile station 10 via the base station B22 to the fixed speech path to the partner machine 50 (214).
Then, the channel switching during the call ends.

[0016]

As described above, according to the conventional zone switching method for a mobile station, when the base station measures the reception levels of all the radio channels during a call and detects a level less than a specified value, the exchange is switched to the exchange. In addition to the notification, when the exchange specifies a wireless channel, it detects the reception level above the specified value and notifies the exchange, and when the exchange receives a notification of the decrease in the reception level, it searches for peripheral stations of the source base station. Level measurement is instructed, and when a measurement value is reported, one base station is selected and the related communication channel is notified to each related base station. As a small-scale general-purpose exchange for accommodating and connecting a mobile device, for example, a private branch exchange, the control becomes complicated and the load per terminal line increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a zone switching system for a mobile device which solves the above problems by causing a mobile device serving as a terminal to control switching of a radio channel during a call.

[0018]

According to the in-call zone switching system of a mobile unit according to the present invention, a mobile unit in a call in a wireless zone formed by each of a plurality of wireless base stations accommodated in a mobile wireless switchboard is used by another mobile unit When moving to the zone, the call zone is switched by continuing the call by switching the call zone.In the zone switching method of the mobile station, the mobile station in the call is connected via the base station that connects the channel in the call when the switching request occurs. ,
As a result of receiving the line number of the communication channel being connected and transmitting the level measurement signal constantly monitored by all base stations at a predetermined level, the measurement level values returned from these base stations are received and compared, and one of the base stations is When selecting and making a call, a notification of one radio channel set by the base station that received this call is received, and the radio channel in communication up to that time is switched to this radio channel to form a new communication path, A request to switch the previous communication path to this new communication path is issued.

[0019]

Next, the present invention will be described with reference to the drawings. 1 and 2 are procedure diagrams showing an embodiment of the present invention,
FIG. 3 is a relay system diagram showing an example of the mobile communication system already described, and FIG. 4 is a block diagram showing an example of connection of a communication path between the exchange of FIG. 3 and a base station.

The same components as those shown in FIG. 3 are designated by the same reference numerals, and their description will be omitted.

As shown in FIG. 4, a wired line 60 (FIG. 3)
The communication path 61 is connected to the line circuits 31 and 32 from the base stations A21 and B31, respectively, in the same manner as the telephone 23 is connected to the line circuit 33. Line circuit 31-
A circuit number, for example, is assigned to each of 33 as an identification code.

The wired line 60 between the base stations A21 and B22 and the exchange 30 may be a digital line or an analog line.

The call path 61 is a voice signal transmission path for a call, and connects the mobile device 10 to the partner device 50 via the line circuit of the exchange 30 and the call path switch. The control line 62 is a signal transmission line for control, and is, for example, a common line signal line that connects the control unit of the exchange 30 and the control units of the base stations A21.

Here, a zone switching procedure by the movement of the mobile unit will be described with reference to FIGS. 1 and 2 and FIGS. 3 and 4.

First, the mobile unit 10 moves in the zone A,
A call is being formed by forming a communication path from the base station A21 to the partner device 50 via the exchange 30 and the fixed telephone network 40.

The mobile station 10 issues a switching request (procedure 101) when any one of the reception level lower than the specified value and the zone switching request button operation occurs during a call on the wireless line 70 with the base station A21. , The base station A21 via the communication channel or control channel of the wireless line 70.
A zone switching request is transmitted to (step 102).

When the base station A21 receives this zone switching request, the base station A21 sends the exchange 3 via the control path 62 of the wired line 60.
0 (step 103).

When the exchange 30 receives the zone switching request, the exchange 30 searches the storage area of the mobile device data from the identification number (for example, the transmission source number) of the requesting mobile device 10 included in the request (procedure 104), and then the transmission source. Mobile phone 10 during a call 6
The line number 1 is taken out and transmitted to the base station A21 including the line number of the line circuit A31 being connected (procedure 105).

The base station A21 transfers the received line number to the source mobile unit 10 as a "switching response" of the response signal to the "zone switching request" received from the mobile unit 10 (procedure 106).

Next, the mobile unit 10 broadcasts the level measurement signal (procedure 107). This level measurement signal is transmitted to the mobile unit 10
"Start location registration" will start the location registration procedure.
It can be said that.

Peripheral base stations including the base stations A21 and B22 measure the reception level when receiving the level measurement signal (procedure 108), and when the level measurement signal is not less than the specified value, return and report the measurement value as a response signal (procedure 109). ) Do.

The mobile station 10 selects one base station B22 that has reported the maximum level value from the sequentially received measurement values (procedure 110) and makes a call to this base station B22 (procedure 111).

When the base station B22 receives a call, the base station B22 sets the radio communication channel to be used (procedure 112) and, at the same time, sets the data of the radio communication channel to be used as a call acceptance in response to the received call. Send to 10 (Procedure 1
13) and make a call via the new communication path 61 (procedure 11
4) Then, the line circuit B32 of the exchange 30 is activated.

The mobile station 10 uses the received call reception as a channel switching request, switches the wireless channel currently in use to the newly set channel included in the call reception (procedure 115), and sends the channel to the base station B22. Notification of the completion of switching (step 116).

The base station B22 transfers the received notification of channel switching to the exchange 30 as a switching request (procedure 1).
17).

When the exchange 30 receives the switching request from the base station B22, the exchange 30 moves such as the number of the new call wireless channel received by the switch request and the line number of the new call path 61 activated by the call in step 114. Data relating to the new speech path of the device 10 is registered (procedure 118), and a switching request response is transmitted to the base station B22 (procedure 119).

The base station B22 sends the received switching request response to
Transfer to the mobile device 10 as a position information update request (procedure 12
0).

The mobile device 10 updates the position information to the base station number of the base station B22 in the zone B and the channel number to be used by the received position information update request (procedure 121).
At the same time, an update response including the line number of the previously used communication path 61 is returned to the base station B22 (procedure 122).
I do.

The base station B22 transfers the received update response to the exchange 30 as an update notification (procedure 123).

When the exchange 30 receives the update notification from the base station B22 via the line circuit B32, it receives the line number of the previous communication path, so that the communication path with the partner device 50 is switched to the new communication path 61. (Procedure 124) is performed, and the base station A21 is connected via the line circuit A31 which has been connected until then.
A recovery command is transmitted to (step 125).

The base station A21 restores all the conditions to the mobile unit 10 by the received restore command (procedure 126),
The recovery response is returned to the exchange 30 (procedure 127).

When the exchange 30 also receives the restoration response, the line circuit A31 confirms the restoration and the processing procedure is completed.

In the case where the information / signal transmission / reception of the present embodiment is carried out on the control path, the communication path is momentarily cut off from the channel switching in the mobile device in step 114 to the switching of the communication path in the exchange in step 124. If the other device is notified of the switching in progress by a holding tone or the like, the call may be interrupted from when the exchange requests the zone switching in step 104 until the call path is switched in step 123.

In the present embodiment, the mobile communication system with reference to the car telephone has been described. However, in the case of a private branch exchange using a cordless telephone, that is, a wireless telephone as a mobile station, a base station forming a wireless zone is a wireless connection device. The exchange that connects and accommodates this wireless connection device via a wired line is a wireless line control device.

Although a wired line is shown and described as connecting between the exchange and the base station, a wireless line may be connected to a base station installed in a valley or a distant building. The base station selected by the mobile station has been illustrated and described as having one of the highest measurement level values, but it was premised that there is no measurement value report from the base station that is using all channels.

[0046]

As described above, in the in-call zone switching system of the mobile unit according to the present invention, after the mobile unit issues a zone switching request and receives the line number of the busy channel in response to this request. By selecting one of the base stations that transmitted a high measurement value when transmitting the level measurement signal to the peripheral base station and receiving the measurement value, and switching the channel when instructed the new call wireless channel with this base station. It eliminates the need for the base station to detect below the specified level of the reception level of all wireless channels in use, and to confirm that it does not exceed the specified level of the received level of the indicated new wireless channel, and the exchange shall There is the effect of simplifying the control of the mobile unit of the exchange and eliminating the load per terminal line by eliminating the control of selection.

[Brief description of the drawings]

FIG. 1 is a procedure diagram showing the first half of an embodiment of the main operation of the present invention.

FIG. 2 is a procedure diagram showing the latter half of the operation procedure of FIG.

FIG. 3 is a relay system diagram showing an example of a mobile communication system.

FIG. 4 is a block diagram showing an example of a communication path connection connecting a base station and an exchange in FIG.

FIG. 5 is a procedure diagram showing an example of a conventional main operation.

[Explanation of symbols]

 10 Mobile device (wireless telephone) 21, 22 Base station (wireless connection device) 30 Switch (wireless line control device) 61 Call path

Claims (1)

(57) [Claims] 1. A mobile device that continues a call by switching a call zone when a mobile device in a call in a radio zone formed by each of a plurality of radio base stations accommodated in a mobile radio switch moves to another radio zone. In the in-call zone switching method, the mobile device in a call receives the line number of the in-use communication path via the base station that connects the wireless channel in the call when the switching request is generated, and all base stations As a result of transmitting a level measurement signal that is constantly monitored with
When the measured level values returned from these base stations are received and compared and one of the base stations is selected to make a call, a notification of one radio channel set by the base station receiving the call is received, and this radio A zone switching method during a call of a mobile device, characterized in that a request is made to switch the existing communication channel to this new communication path while switching the wireless channel currently in communication to the channel to form a new communication path.