JPH08317448A - Channel changeover informing system in mobile communication system - Google Patents

Abstract

PURPOSE: To notice an opposite terminal of a portable terminal during communication, while moving, of the fact that hand-over is started when the hand-over is generated in a mobile communication system. CONSTITUTION: When a PS 6 moves from an SAa 1 and reaches near a boundary with an SAb 2 while performing the communication with the PS 7, it reaches the threshold of whether or not the communication can be maintained. In the state, the PS 6 tentatively interrupts the communication with the PS 7 and starts the search of a new channel capable of the communication. Simultaneously, in the PS 6, a control message for indicating the start of the search of the channel is transmitted to an MEQ 3. In the MEQ 3, after discriminating that the communicating party of the PS 6 is the PS 7, a CTL 33 controls an SW 31, tentatively disconnects the connection of the PS 7 and the PS 6 and connects the PS 7 and a TKE 32. Then, talkies from the TEK 32 are transmitted through a cable 51 and a CSb 5 to the PS 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a channel switching notification system in a mobile communication system, and more particularly to a reconnection type channel switching (handover) notification for switching a wireless communication channel without disconnecting a call by a mobile terminal in communication. The present invention relates to a channel switching notification method in a mobile communication system for a communicating terminal.

[0002]

2. Description of the Related Art Generally, in handover in a mobile communication system, a mobile terminal interrupts communication through a wireless communication channel whose radio wave condition has deteriorated and searches for a new channel.

When the new channel can be captured, the communication is restarted by this wireless communication channel, but until the restart, the portable terminal of the communication partner waits silently.

As an example of a conventional mobile communication system of this type, there is a "wireless channel switching system during a call" disclosed in Japanese Patent Laid-Open No. 63-29458. In this conventional example, when the radio wave condition of the wireless communication channel being used deteriorates and exceeds a certain threshold, the mobile terminal on the side of the handover starts searching for a new channel. At the same time, by guiding the output of the tone oscillator inside the mobile terminal to the handset, the user is made aware of the start of the handover.

[0005]

Generally, in a mobile communication system, a radio wave condition of a radio communication channel in use deteriorates, and a handover occurs when a certain threshold is exceeded.

In the conventional mobile communication system described above, when the threshold value is exceeded, the mobile terminal on the side of the handover starts searching for a new channel. At the same time, by guiding the output of the tone oscillator inside the mobile terminal to the handset, the user is made aware of the start of the handover. On the other hand, the mobile terminal of the communication partner of this user has been kept silent until the handover is completed and communication is restarted by the new channel.

In particular, in a mobile communication system of digital radio communication, a relatively clear speech quality is maintained until just before the threshold value is exceeded, and when a handover is started, a silent state suddenly occurs. The user of the mobile terminal as the communication partner may mistakenly recognize that the call has been disconnected, and may perform the call recovery operation by himself.

Therefore, there is a problem that the user on the calling side redistributes to the partner terminal in order to perform communication again, and it takes a lot of time to redial, which is very inconvenient.

An object of the present invention is to provide a mobile communication system capable of notifying a partner terminal of a mobile terminal which is moving while the mobile communication system is moving when the handover occurs, to the effect that the handover is started. In order to provide a channel switching notification method in.

[0010]

According to the present invention, in a mobile communication system composed of a mobile terminal, a radio base station, and a main unit, communication is being performed during reconnection-type channel switching performed when the mobile terminal moves. When the mobile terminal moves to a wireless service area different from the wireless service area to which the mobile terminal currently belongs, the mobile terminal starts searching for a new usable wireless communication channel in the wireless service area to which the mobile terminal moves. Notifying means for notifying the main device, connection means for connecting the tone or talkie to the partner terminal which is in communication with the mobile terminal by the main device which has received the notification, and a new result of the search for the wireless communication channel. A mobile terminal that has captured a different wireless communication channel makes a channel switching request to the main device, and the main device uses this channel. Channel switching notification method is obtained in a mobile communication system, comprising a speech path switching means for switching the channel switch based on the switching request.

Further, there is provided a channel switching notification system in a mobile communication system in which the partner terminal is a mobile terminal.

[0012]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a mobile communication system showing an embodiment of the present invention.

Referring to FIG. 1, the mobile communication system of this embodiment has a plurality of radio base stations (CSa, CSa) connected to a main unit (MEQ) 3 by cables 41, 51, respectively.
b) 4 and 5 and mobile terminals (PS) 6, 7 and 8 that move in or between the wireless service areas (SAa and SAb) 1 and 2 of CSa4 and CSb5.

The MEQ 3 is provided with a connection switch (SW) 31 for accommodating the cables 41, 51 and a talkie trunk (TKE) 32, and a control unit (CTL) 33 for performing all controls in the MEQ 3. There is.

The MEQ3 and the CSa4 and CSb5 send and receive control messages according to the communication protocol defined between them through the control channels in the cables 41 and 51, whereby the CTL33 of the MEQ3.
Can control CSa4 and CSb5.

SAa1 and SAb2 are CSa4 and
It is a wireless service area of CSb5, CSa4, CS
P existing in each SAa1 and SAb2 through b5
S indicates the range in which communication is possible.

In the present embodiment, if CSa4 and CSb5 each have three wireless communication channels, three PSs located in each SAa1 and SAb2 simultaneously talk using this. be able to.

The wireless communication channels of CSa4 and CSb5 are managed by MEQ3.
4, C in MEQ3 based on the request from CSb5
The TL 33 is allocating channels.

A radio control channel is used to connect CSa4, CSb5 and each PS to exchange control messages.

PS6, PS7 and PS8 can communicate with each other via a wireless communication channel, and each PS receives an instruction from a control message from CSa4 and CSb5 using a wireless control channel and a control message based on a user operation. To send.

Next, the operation of this embodiment will be described with reference to FIG. FIG. 2 is a sequence chart for explaining the operation in FIG.

In this embodiment, PS6 is initially located in SAa1, and PS7 and PS8 are located in SAb2 and each uses one wireless communication channel. And
An example will be described in which PS6 moves into SAb2 as indicated by a dashed arrow while talking with PS7 through CSa4, cable 41, SW31, cable 51 and CSb5.

Since PS6 controlled by CSa4 moves away from CSa4 along with the movement, the radio wave condition gradually deteriorates, and SAa1 and SAb2
Reaching the boundary with and reaches the threshold of whether the call can be maintained.

In this state, PS6 suspends the call with PS7 and starts searching for a new channel in which the call is possible.

At the same time, the PS 6 guides the user to recognize the start of the handover by guiding the output of the tone oscillator in the own terminal to the handset as described in the prior art. Then, a control message indicating the start of channel search is transmitted to MEQ3.

In the MEQ 3 which receives this control message, the CTL 33 first identifies that the other party of PS 6 is PS 7. Next, the CTL 33 controls the SW 31 to disconnect the connection between PS7 and PS6 once, and the PS7 and TKE
The connection with 32 is made.

Then, the talkie from the TKE 32 is sent to the PS 7 through the cable 51 and CSb5. Here, the talkie is used to notify that the call is temporarily interrupted because the call partner is moving, such as “the partner terminal is currently moving”.

Therefore, PS7 which listened to this talkie
The user of can recognize that the PS 6 of the other party is currently performing the handover, and can judge that it is sufficient to wait in this state for a while.

At the time when the handover is completed, PS6 is located in SAb2 and is controlled by CSb5.

In CSb5, there is another free wireless communication channel in addition to the channel used by PS7 and PS8.
Therefore, when PS6 requests CSb5 to switch to this idle wireless communication channel through the control channel, this request is further sent from CSb5 to MEQ3 as a handover request.

When the MEQ 3 receives this handover request, the CTL 33 follows the CS request according to the handover request.
The vacant wireless communication channel of b5 is newly allocated to PS7, and the wireless communication channel used up to that time with CSa4 is released.

Then, the MEQ3 controls the SW31,
The TKE 32 connected to the PS 7 is disconnected and the call path using the new channel is switched instead. As a result, CSb5 accepts the call setup, and PS6 and PS7 are controlled by CSb5 in SAb2 to enter the call state again.

In this embodiment, the communication partner terminal of the mobile terminal to which the handover is performed is the mobile terminal, but the partner terminal may be a fixed terminal accommodated in the general public network. Needless to say.

Although the other terminal is made to hear the talkie, it is easy to make the tone for notifying the handover heard.

[0035]

As described above, according to the present invention, in a mobile communication system composed of a mobile terminal, a radio base station and a main unit, a mobile phone which is in communication at the time of reconnection type channel switching performed when the mobile terminal moves. When the terminal moves to a wireless service area different from the wireless service area to which the terminal currently belongs, the main device is that the Koho mobile terminal starts searching for a new usable wireless communication channel in the destination wireless service area. Notifying means for notifying, connection means for the main device receiving this notification to connect a tone or talkie to the partner terminal communicating with the mobile terminal, and a new wireless communication channel is captured as a result of searching for a wireless communication channel. The mobile terminal sends a channel switching request to the main device, and the main device turns off the communication path based on this channel switching request. By providing the communication path switching means for switching, the user of the communication partner terminal is made aware that the channel is being switched, so that it is possible to wait several seconds until communication is restarted on the new channel. .

Therefore, it is possible to prevent the user from erroneously disconnecting the call, and there is an advantage that the user does not have to perform an unnecessary redialing operation.

[Brief description of drawings]

FIG. 1 is a block diagram of a mobile communication system showing an embodiment of the present invention.

FIG. 2 is a sequence chart for explaining the operation in FIG.

[Explanation of symbols]

 1, 2 wireless service area (SAa, SAb) 3 main unit (MEQ) 4, 5 wireless base station (CSa, CSb) 6, 7, 8 mobile terminal (PS) 31 connection switch (SW) 32 talkie trunk (TKE) 33 Control unit (CTL) 41, 51 Cable

Claims (2)

[Claims] 1. A mobile communication system comprising a mobile terminal, a radio base station and a main unit, wherein the radio to which the mobile terminal is currently communicating at the time of reconnection type channel switching performed when the mobile terminal moves. Notifying means for notifying the main device that this mobile terminal has started a search for a newly usable wireless communication channel in the wireless service area of the moving destination when moving to a wireless service area different from the service area, Upon receiving this notification, the main device has connection means for connecting a tone or talkie to a partner terminal communicating with the mobile terminal, and a mobile terminal that has acquired a new wireless communication channel as a result of the search for the wireless communication channel. Channel switching request means for making a channel switching request to the main device, and the main device based on this channel switching request A channel switching notification system in a mobile communication system, comprising: a communication path switching unit for switching the channel. 2. The channel switching notification system in a mobile communication system according to claim 1, wherein the partner terminal is a mobile terminal.