JPH0646473A - Mobile body communication system - Google Patents

Abstract

PURPOSE:To reduce the processing in a mobile body communication exchange and each base station by performing decision for the switching period and switching destination of a control zone and the issuance of a switching request according to the movement of a mobile body terminal between the control zones by the mobile body terminal itself. CONSTITUTION:The mobile body terminal 5 under the control of the base station (A) 2 always measures the electric field strength of a wave from a peripheral base station, and sends out a control zone switch request signal to the base station (B) 3 via the control channel (B) 12 of the base station when the electric field strength of the base station (B) 3 is increased higher than that of its own control base station (A) 2. The request signal is reported from the base station (B) 3 to the mobile body communication exchange 1 via a communication line (B) 13, and an individual speech path (Ba) 11 and an individual radio channel (B) 10 are set newly between the mobile body communication exchange 1 and the mobile body terminal 5, and a call being issued (communicated) at present is switched to the path, and the path via the base station (A) 2 being used so far is returned to a vacant path.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system, and more particularly to a mobile communication system in which a radio service area under a mobile communication switch is divided into a plurality of areas, and a base station is arranged in each of the plurality of areas (control zones). The present invention relates to mobile control zone switching for switching control zones for mobile terminals in a communication system.

[0002]

2. Description of the Related Art Conventionally, in this type of mobile communication system, when the control zone is switched by the movement of the mobile terminal, the electric field strength of the radio wave transmitted by all the mobile terminals under the control of the base station, the mobile terminal The mobile terminal constantly monitors the electric field strength of the surrounding base stations measured by the mobile terminal, and the base station determines the control zone switching and reports the switching request to the mobile communication switching equipment, or the mobile communication switching equipment. Was performing switching processing of the control base station after determining switching.

[0003]

In the conventional mobile communication system described above, each base station monitors the electric field strength of all mobile terminals within its own control zone, the electric field strength reported from the mobile terminals, and the like. Since the management is performed and the control zone switching determination processing of the corresponding mobile terminal and the switching destination selection processing are performed, when the number of mobile terminals increases or the movement of the mobile terminals between zones becomes severe, the base station / The processing of the mobile telecommunication exchange is increased to affect the processing capacity, and when switching the processing zone, the switching notification to the corresponding mobile terminal is reported from the base station whose electric field strength is weakening. The terminal may not be able to receive the notification, and there is a problem that switching may fail.

[0004]

A mobile communication system of the present invention divides a radio service area under a mobile communication switch into a plurality of areas, and a base station is arranged in each of the plurality of areas. In, the mobile terminal, a measuring means for measuring the electric field strength of radio waves transmitted from the peripheral base station,
It has a selection means for selecting a base station having the highest electric field strength and a transmission means for transmitting a control zone switching request signal to the selected base station, and each base station in the plurality of areas sends the request signal to the mobile unit. The mobile communication exchange has a relay means for relaying to a telecommunication exchange and a channel setting means for setting an individual radio channel between the mobile terminals according to an instruction from the mobile communication exchange, and the mobile telecommunication exchange has the base station and its own mobile unit. A call path setting means for setting an individual call path between telecommunication exchanges,
The mobile communication terminal has a switching means for switching an individual communication path with the current control base station to the new control base station side.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a system configuration diagram showing an embodiment of the present invention.

Referring to FIG. 1, in the mobile communication system of this embodiment, a mobile communication exchange 1 has a base station (A) 2 via an individual communication path (A) 7 and a communication line (A) 9, respectively.
And the base station (B) 3 via the individual communication path (B) 11 and the communication line (B) 13, and the base station (C) 4 via the individual communication path (C) 15 and the communication line (C) 16. When the mobile terminal 5 is under the control of the base station (A) 2, the mobile terminal 5 is connected to the base station (A) 2 via the control channel (A) 8 and the individual radio channel (A) 6. , The mobile terminal 5
When it is under the control of the base station (B) 3, it is connected to the base station (B) 3 via the control channel (B) 12 and the individual radio channel (B) 10.

Next, the function of each device and each line in FIG. 1 will be described.

The mobile telecommunication exchange 1 has functions such as call control, management of mobile terminals, base station control, connection control with other networks, control zone switching control, etc.
(B) 3 and (C) 4 have functions such as call control, mobile terminal management, radio channel management, and control zone switching control, and the mobile terminal 5 has call control, base station electric field strength. It has functions such as measurement, electric field control, and man-machine interface. Individual radio channels (A) 6 and (B)
Reference numeral 10 is a telephone (communication) wireless line for transmitting voice (data) between the mobile terminal and the base station, and control channels (A) 8 and (B) 12 are between the mobile terminal and the base station. It is a control signal radio line through which control signals such as a call connection control signal and a control zone switching control signal flow. Individual call path (A)
Reference numerals 7, (B) 11, and (C) 15 are call (communication) lines for transmitting voice (data) between the base station and the mobile communication exchange. Communication lines (A) 9, (B) 13, (C) 16
Is a call connection control signal between the base station and the mobile telecommunication switch,
A control signal communication line through which control zone switching control signals and the like flow.

FIG. 2 is a block diagram showing a mobile terminal in this embodiment.

In FIG. 2, the mobile terminal 5 in this embodiment has an individual radio channel receiver 210, a control channel receiver 220, and a control channel transmitter 23.
0, an individual radio channel transmitter 240, an electrolytic strength measuring device 250, a mobile terminal main controller 260 and an antenna 270.

The mobile terminal main controller 260 is provided with a base station determination unit 261 and a signal transmission unit 262. The antenna 270 includes an individual radio channel receiver 210, a control channel receiver 220, a control channel transmitter 230, an individual radio channel receiver 210, a control channel receiver 220, and a control channel transmitter 23.
0, the individual radio channel transmitting device 240, the separate radio channel receiving device 210, the control channel transmitting device 230, the individual radio channel transmitting device 240 are respectively the mobile terminal main control device 260, and the control channel receiving device 220 is It is connected to the base station determination unit 261 in the mobile terminal main controller 260 via the electrolytic strength measuring device 250.

Next, the function of each block in FIG. 2 will be described.

The individual radio channel receiver 210 synchronizes a reception frequency / time slot with an individual call channel used for a call (communication) with a base station, and a voice (data).
The individual radio channel transmission device 240 is a radio device that receives a signal, and the individual radio channel transmission device 240 is a radio device that transmits a voice (data) signal in synchronization with the transmission frequency / time slot of the individual radio channel. Control channel receiver 22
Reference numeral 0 denotes a wireless device that synchronizes a reception frequency / time slot with a control channel used for communication of control information with a base station and receives a control signal. The control channel transmitter 230 transmits the control frequency to the control channel. / A wireless device that synchronizes time slots and sends a control signal.

The field strength measuring device 250 is a device for measuring the electric field strength of the control channel transmitted by the neighboring base station, which is received via the control channel receiving device 220. The mobile terminal main controller 260 selects a power-on base station, call connection control, control zone switching control, and the mobile terminal 5
It has functions of power supply control, failure monitoring, etc., and in particular, the base station determination unit 261 determines the best from the electric field strength of the neighboring base stations measured by the electrolytic strength measuring device 250 during power-on or during a call (communication). It has a function of determining a strong base station, and the signal transmission unit 26
2 is for the base station determined by the base station determination unit 261:
It has a function of editing this signal for transmitting a control zone switching request signal and a function of starting transmission to the control channel transmission device 230.

FIG. 3 is a block diagram showing a base station in this embodiment.

In FIG. 3, the base stations (A) 2, (B) 3 and (C) 4 in the present embodiment respectively include an individual radio channel transmitter 310, an individual radio channel receiver 320, a control channel receiver 330, Control channel 340, base station main controller 350, individual channel device 3
60, a telephone line device 370, and an antenna 380. The signal relay unit 3 is provided in the base station main controller 350.
51 and an individual radio channel control unit 352.

The antenna 380 is connected to the individual radio channel transmitter 310, the individual radio channel receiver 320, the control channel receiver 330 and the control channel transmitter 340, and the base station main controller 350 is the individual radio channel transmitter 310, the individual radio channel transmitter 310. It is connected to the wireless channel receiving device 320, the control channel receiving device 330, the control channel transmitting device 340, the individual speech path device 360 and the transmission line device 370, and the individual speech path device 360 is the individual speech paths (A) 7, (B) 11 , (C) 15 and the communication line device 370 are the communication lines (A) 9, (B) 13,
(C) 16 are respectively connected.

Next, the function of each block in FIG. 3 will be described. The individual wireless channel transmitter 310 is a wireless device that synchronizes a transmission frequency / time slot with an individual communication channel with a mobile terminal and transmits a voice (data) signal, and the individual wireless channel receiver 320 is the above-described individual wireless channel receiver. A wireless device that receives a voice (data) signal in synchronization with a receiving frequency / time slot of a wireless channel.

The control channel receiver 330 is a radio device that synchronizes a reception frequency / time slot with a control channel used for communication of control information with a mobile terminal and receives a control signal, and the control channel transmitter 340.
Is a radio device for transmitting a control signal by synchronizing the transmission frequency / time slot with the control channel.

The base station main controller 350 manages a radio channel (individual radio channel / control channel) between the base station and the mobile terminal, and a wired channel (individual call path / communication line) between the mobile communication switch and the base station. ) Management, wireless channel / wired channel connection management, mobile terminal management, call connection management, control zone switching control, and the like. In particular, the signal relay unit 351 controls the control channel (wireless) and communication line. (Wired) connection, relays signals between the mobile terminal and the mobile communication exchange, and the individual wireless channel control unit 352 sets the individual wireless channel,
Controls such as cancellation, switching, and connection to individual communication paths.
The individual speech path device 360 performs transmission of the individual speech path between the base station and the mobile communication exchange, and the communication line device 370 performs protocol control and transmission of the communication line between the base station and the mobile communication exchange.

FIG. 4 is a block diagram showing a mobile communication exchange in this embodiment.

In FIG. 4, the mobile communication switching system 1 of this embodiment is provided with individual channel devices 410, 420, 460, and
A communication line device 430, a speech path switching device 440 and a mobile communication switching system main controller 450 are provided. The individual communication path control unit 45 is provided in the mobile communication switching system main controller 450.
1 and an individual speech path switching unit 452.

The individual speech path devices 410, 420, 460 are connected to the speech path switching device 440, the mobile communication switching system main controller 450 is connected to the communication line device 430 and the speech path switching device 440, and the individual speech path device 410 is connected. , 42
0 and 460 are individual communication paths 7, 11 and 15 respectively.
The communication line device 430 is connected to the communication lines 9 and 13.

Next, the function of each block in FIG. 4 will be described.

The individual speech path device 410 (420) performs transmission of an individual speech path between the base station and the mobile communication exchange, and the individual speech path device 460 includes a mobile communication exchange and another exchange (network).
The communication line device 430 performs protocol control and transmission of the communication line between the base station and the mobile communication exchange. The call path switching device 440 connects, releases, and switches the call path paths between the individual call paths. The mobile communication switching system main controller 450 has functions such as base station management, call connection processing, control zone switching processing, connection processing with other networks such as the public network, maintenance / operation, etc., and in particular the individual call path control unit 451. Manages / controls connection information between individual call paths, issues an instruction to the call path switching device 440, and the individual call path switching unit 452 controls switching of the individual call path according to switching of the control zone, Road switching device 44
Give an instruction to 0.

Next, the control zone switching operation of the mobile communication system of the present embodiment having the above configuration will be described with reference to FIGS.

The mobile terminal 5 under the control of the base station (A) 2 controls itself while communicating with the base station (A) 2 through the individual radio channel (A) 6 and the control channel (A) 8. The electric field strength of the radio wave transmitted from the base station (A) 2 and the electric field strengths of the control channel (B) 12 and the control channel (C) 14 from the base station (B) 3 and the base station (C) 4 arranged in the periphery. Is constantly measured by the electrolytic strength measuring device 250 via the control channel receiving device 220.

As the mobile terminal 5 moves toward the base station (B) 3, the electric field strength of the current control base station (A) 2 gradually decreases, and conversely the electric field strength from the base station (B) 3 decreases. But it grows gradually. Further, when the electric field strength of another base station becomes stronger than that of the current control base station (A) 2 as the mobile terminal 5 moves, the mobile terminal 5 determines the strongest base station by the base station determination unit 261. (In this embodiment, the base station (B) 3), the signal sending unit 262 sends a control zone switching request signal to the base station (B) 3 via the control channel transmitter 230 and the control channel (B) 12 of the strongest base station. Is sent.

The base station (B) 3 receives the main signal from the mobile terminal 5 as a control channel receiver 330 and a signal relay unit 35.
The data is relayed to the mobile communication exchange 1 via the first communication line device 370 and the communication line (B) 13. When the mobile communication exchange main controller 450 of the mobile communication exchange 1 receives this signal from the base station (B) 3 via the communication line (B) 13 and the communication line device 430, the communication line device 430 and the communication line ( B)
Via the base station (B) 3 and the mobile terminal 5 via (13).
At the same time, the individual communication channel control unit 451 sets the individual communication channel (B) 11 between the mobile communication switching system 1 and the base station (B) 3 by instructing to set the individual wireless channel (B) 10.

On the other hand, the base station (B) 3 is connected to the communication line (B).
13. When receiving a setting request for the individual wireless channel (B) 10 through the communication line device 370, the individual wireless channel control unit 352 causes the individual wireless channel (B) between the mobile terminal 5 and the base station (B) 3. Set 10. Between the mobile communication exchange 1 and the mobile terminal 5, an individual call path (B) 1
1. When the individual radio channel (B) 10 is set, the individual radio channel (A) 6 is transmitted to the mobile terminal 5 through the mobile communication exchange 1, the communication line (B) 13, and the control channel (B) 12. Instruct to switch to channel (B) 10.

The mobile terminal 5 completes the switching to the individual radio channel (B) 10 and then the control channel (B) 1
2. The switching end is notified to the mobile communication exchange 1 through the communication line (B) 13. When the mobile communication exchange 1 receives this notification, the individual call path switching unit 452 instructs the call path switching device 440 to switch the call path path from the individual call path device 410 to the individual call path device 420 and is currently in a call (communication). The call is switched from the individual speech path (A) 7 to the individual speech path (B) 11, and the control of the mobile terminal 5 is transferred from the base station (A) 2 to the base station (B) 3. After that, the individual speech path control unit 451 of the mobile communication switching center 1 and the individual wireless channel control unit 352 of the base station (A) 2 restore the individual speech path (A) 7 and the individual wireless channel (A) 6 to the empty state. .

[0033]

As described above, the present invention is a mobile communication system in which a radio service area under the control of a mobile communication switch is divided into a plurality of areas, and a base station is arranged in each of the plurality of areas (control zones). The mobile terminal measures the electric field strength of the radio waves transmitted from the peripheral base stations, the selecting means selects the base station having the highest electric field strength, and the sending means sends the control zone switching request signal to the selected base station. Each of the base stations in the plurality of areas has a relay unit that relays the request signal to the mobile communication exchange, and a channel setting unit that sets an individual radio channel between the mobile terminals according to an instruction from the mobile exchange. However, the mobile communication switching system establishes a communication channel setting means for setting an individual communication channel between the base station and the own mobile communication switching system, and an individual communication channel between the mobile terminal and the current control base station of the new control station. The mobile terminal mainly has the switching means for switching and performs the control zone switching determination and request to monitor / manage the control zone switching timing of each mobile terminal in the mobile communication exchange / base station. Is unnecessary, the processing of the mobile communication switch / base station can be significantly reduced, and the control zone switching request is always issued to the base station with a strong electric field strength. This has the effect of reducing call loss.

[Brief description of drawings]

FIG. 1 is a system configuration diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a mobile terminal according to the present embodiment.

FIG. 3 is a block diagram showing a base station in the present embodiment.

FIG. 4 is a block diagram showing a mobile communication switching system in the present embodiment.

[Explanation of symbols]

 1 Mobile Communication Switch 2 Base Station (A) (Current Control Station) 3 Base Station (B) (New Control Station) 4 Base Station (C) 5 Mobile Terminal 6 Individual Radio Channel (A) 7 Individual Call Path (A ) 8 control channel (A) 9 communication line (A) 10 individual radio channel (B) 11 individual call path (B) 12 control channel (B) 13 communication line (B) 14 control channel (C) 15 individual call path ( C) 16 communication line (C) 210 individual radio channel receiver 220 control channel receiver 230 control channel transmitter 240 individual radio channel transmitter 250 electric field intensity measuring device 260 mobile terminal main controller 261 base station determination unit 262 signal transmission 270 antenna 310 individual radio channel transmitter 320 individual radio channel receiver 330 control channel receiver Receiver 340 Control channel transmitter 350 Base station main controller 351 Signal relay unit 352 Individual radio channel controller 360 Individual channel device 370 Communication line device 380 Antennas 410, 420, 460 Individual channel device 430 Communication line device 440 Channel Switching device 450 Mobile communication switching system main control device 451 Individual communication furnace control unit 452 Individual communication path switching unit

Claims (1)

[Claims] 1. In a mobile communication system in which a radio service area under the control of a mobile communication switch is divided into a plurality of areas, and a base station is arranged in each of the plurality of areas, the mobile terminal has an electric field of a radio wave transmitted from a peripheral base station. Each base station in the plurality of areas has a measuring means for measuring strength, a selecting means for selecting a base station having the highest electric field strength, and a transmitting means for transmitting a control zone switching request signal to the selected base station. Has a relay means for relaying the request signal to the mobile communication exchange, and a channel setting means for setting an individual radio channel between the mobile terminals according to an instruction from the mobile communication exchange. Is a new control base for a call path setting means for setting an individual call path between the base station and its own mobile communication exchange, and an individual call path for the current control base station of the mobile communication terminal. A mobile communication system comprising: switching means for switching to the station side.