JPH0638267A - Mobile object exchange system - Google Patents

Abstract

PURPOSE:To prevent interruption of communication attended with the changeover by deciding an optimum base station when a mobile terminal equipment changes over a channel, allowing a mobile communication exchange to control a radio base station to control the changeover of the channel thereby simplifying a changeover control procedure of the channel attended with the movement of the mobile terminal equipment. CONSTITUTION:A communication object base station decision means 302 of a mobile terminal equipment 3 decides an optimum radio base station 2 as a communication object in response to a current position of the terminal equipment 3. A vice packet transmission reception means 301 processes a voice signal sent from the user of the terminal equipment 3 into a packet, sends the packet to the base station 2 decided by the means 302, receives a voice packet sent from the station 2 and inversely converts the packet into a voice signal. A transmission/ reception means 101 of a mobile communication exchange 1 converts the voice signal transmitting to the terminal equipment 3 controlling as a call control exchange into packet, transfers the packet to the terminal equipment 3 via the station 2, receives the voice packet from the terminal equipment and inversely converts the packet into the voice signal. The control means 102 revises a transfer path of the voice packet transferred by the means 101 to the terminal equipment 3. The means 201 transfers the transmission reception voice packet between the terminal equipment 3 and the exchange 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile switching system in a mobile communication network.

[0002]

2. Description of the Related Art FIG. 6 is a diagram showing an example of a mobile communication network to which the present invention is applied, FIG. 7 is a diagram showing an example of a conventional mobile terminal, and FIG. 8 is an example of a conventional radio base station. FIG. 9 is a diagram showing an example of a conventional mobile communication exchange, and FIG. 10 is a diagram showing an example of a conventional channel switching process.

In FIG. 6, a mobile communication network 100 includes a plurality of mobile communication exchanges 1 (individual mobile communication exchanges are referred to as 1 ₁ , 1 _2, etc., the same applies hereinafter), a radio base station 2 and a mobile terminal (MS). 3, each mobile telecommunication switch 1 is connected to the fixed telephone network 400 and mutually connected, and each radio base station 2 is connected to the mobile telecommunication switch 1 to which it belongs. Each radio base station 2
Each mobile terminal (MS) 3 existing in the wireless zone owned by
Connected with.

A mobile terminal (MS) 3, a radio base station 2 and a mobile communication exchange 1 in a conventional mobile communication network 100.
Has a configuration as shown in FIGS. 7, 8 and 9, respectively.

In FIG. 7, a mobile terminal (MS) 3 includes an antenna 31, a radio transmitting / receiving section 32, a voice code decoding section 33,
A handset 34, a terminal control unit 35, and a level monitoring unit 36 are provided, and the antenna 31 and the wireless transmission / reception unit 32 are digitally encoded voice via the wireless line 7 set between the wireless base station 2. The voice code decoding unit 33 digitally encodes and decodes the voice signal by transmitting and receiving a signal,
The handset 34 transmits / receives an analog audio signal, the terminal controller 35 controls the operations of the radio transmitter / receiver 32, the voice code decoder 33, and the handset 34, and the level monitor 36 transmits from each radio base station 2. Monitor the reception level of the received radio waves.

In FIG. 8, the radio base station 2 comprises an antenna 21, a radio transmission / reception unit 22, a communication path unit 23 and a base station control unit 24, and the antenna 21 and the radio transmission / reception unit 2 are provided.
2 transmits and receives a digitally encoded voice signal via the wireless line 7, and the speech path unit 23 is digitally encoded via the communication line 6 set up with the belonging mobile communication exchange 1. The base station control unit 24 transmits / receives a voice signal, and the base station control unit 24 is controlled by the mobile communication switching system 1 to perform wireless transmission / reception unit 22.
And controlling the operation of the communication path unit 23.

In FIG. 9, the mobile telecommunications exchange 1 comprises a speech path unit 11, a speech path control unit 12, a voice code decoding unit 13, a mobile call control unit 14, a home memory unit 15 and a radio base station control unit 16. The call path unit 11 is the call path control unit 1.
Under the control of 2, the communication line 4 or 5 set up between the fixed telephone 500 or another mobile communication exchange 1 and the above-mentioned communication line 6 are connected, and the voice code decoding unit 13 makes the communication line 5 or 6 A digitally encoded voice signal arriving from the mobile station is decoded and transferred to the communication line 4, and an analog voice signal arriving from the communication line 4 is digitally coded and transferred to the communication line 5 or 6 for a mobile call. The control unit 14 executes control of calls to and from the mobile terminal (MS) 3, the home memory unit 15 registers the existing zone of the belonging mobile terminal (MS) 3, and the radio base station control unit 16 controls the radio base station. Perform various (?) Controls for 2.

In FIG. 6 to FIG. 10, a call is set up between the mobile terminal (MS) 3 existing in the radio zone of the radio base station 2 ₁ and the fixed telephone 500 accommodated in the fixed telephone network 400. , mobile terminals (MS) 3 and the radio channel ₇₁ that is set between the wireless base station 2 _1, the wireless base station 2 _1,
Communication line is set between the wireless base station 2 ₁ and the mobile communication exchange 1 ₁ communication line 6 _1, which is set between the mobile communication exchange 1 _1, the mobile communication exchange 1 ₁ and a fixed telephone network 400 4 ₁ and via the fixed telephone network 400, a mobile terminal (MS) 3 and a fixed telephone 500 is referred to as being the call state.

In such a state, the mobile terminal (MS) 3 moves from the radio zone of the radio base station 2 _{1 to} the radio zone of the radio base station 2 ₂ , and the mobile terminal (MS) 3 transmits from the radio base station 2 ₁ . When it is detected that the reception level has deteriorated below a predetermined reference value, a level deterioration report signal (a) is created and transferred to the radio base station 2 ₁ .

When the radio base station 2 ₁ receives the level deterioration report signal (a) transferred from the mobile terminal (MS) 3,
The level deterioration confirmation signal (b) for confirming the reception of the level deterioration report signal (a) is created and returned to the mobile terminal (MS) 3, and the movement destination of the mobile terminal (MS) 3 is set to the radio base station 2 _When it is determined that the mobile station is within the wireless zone ₂ , the channel selection request signal (c) for requesting the wireless base station 2 ₂ to allocate the wireless line 7 ₂ to the mobile terminal (MS) 3 is created, and the mobile communication exchange 1 Transfer to the radio base station 2 ₂ via ₁ and 1 ₂ .

Upon receiving the channel selection request signal (c), the radio base station 2 ₂ selects a radio line 7 ₂ to be assigned to the mobile terminal (MS) 3 and then selects a channel selection response signal for indicating (?) (D) is created and transferred to the radio base station 2 ₁ via the mobile communication exchanges 1 ₂ and 1 ₁ .

Upon receiving the channel selection response signal (d), the radio base station 2 ₁ confirms that the radio line 7 ₂ assigned by the radio base station 2 ₂ is not used by another mobile terminal (MS) 3. A level measurement request signal (e) for confirmation is created and transferred to the mobile terminal (MS) 3.

The mobile terminal (MS) 3 that has received the level measurement request signal (e) measures the signal reception level of the assigned wireless line 7 ₂ and is not used by another mobile terminal (MS) 3. Then, the level measurement response signal (f) is created and transferred to the radio base station 2 ₁ .

[0014] The radio base station 2 _1, which has received the level measurement response signal (f), the mobile terminal via a wireless line 7 ₁ (M
S) Create a channel switching request signal (g) for switching the call set to 3 so as to pass through the wireless line 7 ₂ and transfer it to the mobile communication exchange 1 ₁ .

When the mobile communication exchange 1 _{1 that} has received the channel switching request signal (g) determines that it is necessary to pass through the mobile communication exchange 1 ₂ and the radio base station 2 ₂ in order to switch to the radio line 7 ₂ , it moves. A line connection request signal (IAM) for setting the communication line 5 with the communication exchange 1 ₂ is created, and the mobile communication exchange 1 via a common signal line (not shown).
Transfer to ₂ .

The mobile communication exchange 1 _{2 which} has received the line connection request signal (IAM) sets a communication line 5 with the mobile communication exchange 1 ₁ and then creates a connection completion signal (ACM) and is not shown. Mobile telecommunication exchange 1 ₁ via common signal line
At the same time, the channel setting signal (h) for setting the communication path with the mobile terminal (MS) 3 is created and transferred to the radio base station 2 ₂ .

Upon receiving the channel setting signal (h), the radio base station 2 ₂ connects the assigned radio line 7 ₂ to the mobile terminal (MS).
A channel designation request signal (i) for designating No. ₃ is created and transferred to the radio base station 2 ₁ via the mobile communication exchange 1 ₂ and the mobile communication exchange 1 ₁ .

Upon receiving the channel designation request signal (i), the radio base station 2 ₁ sends the switching destination radio channel designation signal (j) for notifying the mobile terminal (MS) 3 of the radio channel 7 ₂ to be newly used. It is created and transferred to the mobile terminal (MS) 3.

The mobile terminal (MS) 3 that has received the handover radio channel designation signal (j), the transfer by creating a synchronization signal for confirming the state of the radio channel 7 ₂ (k) to the radio base station 2 ₂ To do.

Radio base station 2 ₂ which has received the synchronization signal (k)
Creates a radio channel designation completion signal (m) for notifying that the synchronization signal of the radio line 7 ₂ has been received from the mobile terminal (MS) 3, and the radio channel designation completion signal (m) is transmitted via the mobile telecommunication exchanges 1 ₂ and 1 _1. and transfers to the base station 2 _1, the mobile terminal (M
S) A first synchronization completion signal (n ₁ ) for confirming communication with S3 is created and transferred to the mobile terminal (MS) 3 via the wireless line 7 ₂ .

The mobile terminal (MS) 3 having received the first synchronization completion signal (n ₁ ) creates a second synchronization completion signal (n ₂ ) and sends it to the radio base station 2 ₂ via the radio line 7 _2. Forward. Radio base station 2 that has received the second synchronization completion signal (n ₂ ).
₂ is a channel setting completion signal (p) for notifying that the wireless line 7 ₂ has been set up with the mobile terminal (MS) 3.
The create and transferred to the mobile communication exchange 1 _2.

The mobile communication exchange 1 ₂ having received the channel setting completion signal (p) is a response signal for notifying the completion of the setting of the communication path through the communication line 6 ₂ , the wireless base station 2 ₂ and the wireless line 7 _2. (ANM) to create a mobile telecommunication switch 1
Transfer to ₁ .

The mobile communication exchange 1 _{1 that} has received the response signal (ANM) has a fixed telephone 5 which has been set up via the communication line 6 ₁ , the wireless base station 2 ₁ and the wireless line 7 ₁ until now.
00 and the mobile terminal (MS) 3 to make a call to the communication line 5,
After the connection was changed so as to be set via the mobile communication exchange 1 ₂ , the communication line 6 ₂ , the wireless base station 2 ₂ and the wireless line 7 ₂ , the unnecessary communication line 6 ₁ was released and became unnecessary. A channel disconnection signal (q) for releasing the wireless line 7 ₁ is created and transferred to the wireless base station 2 ₁ .

Upon receiving the channel disconnection signal (q), the wireless base station 2 ₁ releases the wireless line 7 ₁ and then returns the channel disconnection confirmation signal (r) to the mobile communication exchange 1 ₁ . From the above, the mobile terminal (MS) 3 can be connected to the wireless line 7 ₂ , the wireless base station 2 ₂ , the communication line 6 ₂ , the mobile communication exchange 1 ₂ , the communication line 5, the mobile communication exchange 1 ₁ , the communication line 4 ₁ and the fixed telephone. The call is continued with the fixed telephone 500 via the network 400.

[0025]

As is clear from the above description, in the conventional mobile communication network, the mobile terminal (M
S) When 3 moves from the wireless zone of the wireless base station 2 _{1 to} the wireless zone of another wireless base station 2 ₂ , the switching control procedure for switching the communication path becomes complicated, and as described above, various types of control signals are used. Of the fixed telephone 50 while transmitting the second synchronization completion signal (n ₂ ) at the time of switching.
The call with 0 was interrupted for a short time, but there was a problem that noise was generated during that time.

It is an object of the present invention to simplify the communication path switching control procedure associated with the movement of a mobile terminal as much as possible and to prevent the communication interruption due to the switching as much as possible.

[0027]

FIG. 1 is a diagram showing the principle of the present invention. In FIG. 1, reference numeral 1 is a mobile communication exchange, 2 is a radio base station, and 3 is a mobile terminal, which constitutes a mobile communication network.

Reference numeral 101 denotes a mobile communication exchange 1 according to the present invention.
Is a voice packet transmitting / receiving means provided in the. 102
Is a transfer path control means provided in the mobile communication exchange 1 according to the present invention.

Reference numeral 201 is a voice packet transfer means provided in the radio base station 2 according to the present invention. 301 is a voice packet transmitting / receiving means provided in the mobile terminal 3 according to the present invention.

Reference numeral 302 is a communication target base station determining means provided in the mobile terminal 3 according to the present invention.

[0031]

The communication target base station determining means 302 is the mobile terminal 3
Base station 2 most suitable for communication according to the existing position of
To decide.

The voice packet transmitting / receiving unit 301 packetizes the voice transmitted by the user of the mobile terminal 3 and transmits it to the radio base station 2 determined by the communication target base station determining unit 302, and from the radio base station 2. Receives voice packets to be transmitted and converts them back into voice.

The voice packet transmitting / receiving means 101 packetizes voice to be transmitted to the mobile terminal 3 controlled as a call control exchange, transfers it to the mobile terminal 3 via the radio base station 2, and transmits it from the mobile terminal 3. Receive voice packets and convert them back to voice.

The transfer route control means 102 monitors the transfer route of the voice packet transferred from the mobile terminal 3, and when the transfer route is changed, the voice packet transmitting / receiving means 101.
Changes the transfer route of the voice packet transferred to the mobile terminal 3 based on the monitoring result.

The voice packet transfer means 201 transfers voice packets transmitted and received between the mobile terminal 3 and the mobile communication exchange 1. Therefore, even when the mobile terminal moves and it is necessary to switch the communication path, the mobile terminal determines the optimum wireless base station for communication, and the mobile communication exchange controls the wireless base station accordingly and the communication path is changed. To control the switching of
The call path switching control procedure is also greatly simplified, and voice is packetized and transmitted and received, so that the noise caused by the call path switching is greatly reduced.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 2 is a diagram showing a mobile terminal according to one embodiment of the present invention, FIG. 3 is a diagram showing a radio base station according to one embodiment of the present invention, and FIG. 4 is a mobile communication exchange according to one embodiment of the present invention. FIG. 5 is a diagram showing a transfer path switching process according to an embodiment of the present invention. The same reference numerals denote the same objects throughout the drawings. The target mobile communication network is as shown in FIG.

2 to 4, the packet communication device 3 is used as the voice packet transmitting / receiving means 301 in FIG.
7 is provided in the mobile terminal (MS) 3, and the wireless transmission / reception unit 3 is used as the communication target base station determining means 302 in FIG.
2 _a , a terminal control unit 35 _a and a level monitoring unit 36 _a are provided in the mobile terminal (MS) 3, and a packet communication device 17 as the voice packet transmitting / receiving means 101 in FIG. 1 is provided in the mobile communication exchange 1. In addition, the mobile call control unit 14 is used as the communication path control means 102 in FIG.
_a is provided in the mobile communication exchange 1, and a packet communication device 25 is provided in the wireless base station 2 as the voice packet transfer means 201 in FIG.

No antenna 31 in the mobile terminal (MS) 3
Line transmitter / receiver 32_a, Terminal control unit 35 _aAnd level monitoring
Part 36_aIs a plurality of radio base stations 2₁And 2₂Sent from
The received radio waves are received in parallel and each reception level is monitored.
The radio wave received from any of the radio base stations 2.
Determine if the bell is at the highest level and set up a call path
Equipped with the function of determining the optimum wireless base station 2
It

The packet communication device 37 in the mobile terminal (MS) 3 assembles the digitally encoded voice signal transmitted from the voice code decoding unit 33 into a voice packet, and transmits the voice packet via the radio transmitting / receiving unit 32 _a and the antenna 31. Voice packet transmitted to the radio base station 2 and received from the radio base station 2 via the antenna 31 and the radio transmission / reception unit 32 _a is decomposed into a digitally encoded voice signal, and a voice code decoding unit is provided. 33.

Packet communication device 1 in mobile communication switch 1
Reference numeral 7 denotes a voice packet transferred from the radio base station 2 to which it belongs and another mobile communication exchange 1 and transfers the voice packet to the other radio base station 2 or the mobile communication exchange 1 based on the destination information. The voice packet to be transferred to the telephone network 400 is decomposed into a digitally encoded voice signal and transferred to the voice code decoding unit 13, and the digitally coded voice signal transmitted from the voice code decoding unit 13 is converted into a voice packet. Then, it is assembled and transferred to the belonging wireless base station 2 and other mobile communication switching system 1.

The packet communication device 25 in the radio base station 2
Transfers the voice packet transmitted from the wireless transmission / reception unit 22 to the mobile communication exchange 1 to which it belongs, and also transmits the voice packet transferred from the mobile communication exchange 1 to the wireless transmission / reception unit 22.

2 to 6, a call is set up between the mobile terminal (MS) 3 existing in the radio zone of the radio base station 2 ₁ and the fixed telephone 500 accommodated in the fixed telephone network 400. The voice signal of analog format transmitted from the handset 34 in the mobile terminal (MS) 3 is digitally encoded by the voice code decoding unit 33, and the packet communication device 3
7 is assembled into a voice packet by 7 and is set between the radio base station 2 ₁ and the radio line 7 ₁ , the radio base station 2 ₁ and the radio base station 2 ₁ and the mobile communication switch 1 _1. mobile communication exchange via the communication line 6 ₁ of 1 ₁
Is transferred to the packet communication device 17, decomposed into a voice signal digitally encoded by the packet communication device 17, and converted into an analog voice signal by the voice code decoding unit 13, and then, the communication path control unit 12, the communication path unit 11, and mobile communication. An analog voice signal transferred to the fixed telephone network 400 via the communication line 4 ₁ and the fixed telephone network 400 set between the exchange 1 ₁ and the fixed telephone network 400 and transmitted from the fixed telephone 500. Is a fixed-line telephone network 400, a communication line 4 ₁ , a call path unit 11 and a call path control unit 1 in the mobile communication exchange 1 ₁ .
2 is transmitted to the voice code decoding unit 13, is digitally encoded by the voice code decoding unit 13 and is transmitted to the packet communication device 17, and is assembled into a voice packet by the packet communication device 17, and then the communication line 6 ₁ , The mobile terminal (MS) 3 via the radio base station 2 ₁ and the radio line 7 _1.
Is transferred to the mobile terminal (MS) 3, decomposed into a voice signal digitally encoded by the packet communication device 37 in the mobile terminal (MS) 3, converted into an analog voice signal by the voice code decoding unit 33, and transmitted to the handset 34. .

The mobile terminal (MS) 3 and the fixed telephone 50
The voice signal transferred between the mobile terminal (MS) 3 and the mobile switching center 1 ₁ by the call set to 0 is converted into a voice packet and transferred, so that the wireless line 7 ₁ and Unlike the physical communication path setting, the communication line 6 ₁ is set with a logical communication path.

In this state, the mobile terminal (MS) 3 moves from the radio zone of the radio base station 2 _{1 to} the radio zone of the radio base station 2 ₂ , and the mobile terminal (MS) 3 transmits from the radio base station 2 _1. When the wireless transmission / reception unit 32 _a , the terminal control unit 35 _a, and the level monitoring unit 36 _a detect that the reception level of the received radio wave has deteriorated below a predetermined reference value, the transmission radio wave is When the wireless base station 2 ₂ having a higher reception level is identified, a wireless line 7 ₂ is set up with the wireless base station 2 _{2 in} addition to the wireless line 7 ₁ already set up with the wireless base station 2 _1. Then, a packet transmission permission request signal (aa) for requesting the transmission permission of the voice packet call-controlled by the mobile communication exchange 1 ₁ via the radio base station 2 ₂ is created and transferred to the radio base station 2 ₂ . To do.

Upon receiving the packet transmission permission request signal (aa), the radio base station 2 ₂ requests the transmission permission of the voice packet call-controlled by the mobile communication exchange 1 ₁ via the mobile communication exchange 1 ₂ (? ), A packet transmission permission request signal (bb) is created and transferred to the mobile communication exchange 1 ₂ .

The packet transmission permission request signal the mobile communication exchange 1 ₂ receiving (bb) is determined to allow the transmission of voice packets call control by the mobile communication exchange 1 ₁ via the mobile communication exchange 1 ₂ Then, a packet transmission permission response signal (c
c) is created and transferred to the radio base station 2 ₂ .

The radio base station 2 ₂ which has received the packet transmission permission response signal (cc) is determined to allow the transmission of voice packets call control by the mobile communication exchange 1 ₁ via the wireless base station 2 ₂ Then, the packet transmission permission response signal (dd) for giving the transmission permission of the voice packet is created and transferred to the mobile terminal (MS) 3.

Receive packet transmission permission response signal (dd)
The mobile terminal (MS) 3 that has been₁Via
And wireless base station 2₁Voice packet (e
The transfer route information indicating the transfer route added to e) is
Line line 7₁, Wireless base station 2₁, Communication line 6₁And move
Telecommunication switch 1₁Via the wireless line 7₂, Wireless base station 2
₂, Communication line 6₂, Mobile telecommunication switch 1₂, Communication line 5
And mobile telecommunication switch 1₁Change to via wireless line 7₂To
Via the wireless base station 2₂Transfer to.

Upon receiving the voice packet (ee), the radio base station 2 ₂ analyzes the added transfer route information and transfers it to the mobile communication exchange 1 ₂ via the communication line 6 ₂ . The mobile communication exchange 1 _{2 that} has received the voice packet (ee)
It analyzes the transfer route information added, and transfers it to the mobile communication exchange 1 ₁ via the communication line 5.

Mobile communication receiving voice packet (ee)
Exchange 1₁Analyzes the added destination information and communicates
Line 4₁Transfer to fixed-line telephone network 400 via
The transfer path information added to the packet communication device 1
7 and mobile call control unit 14_aAnalyzed by
Mobile terminal (MS) 3 to wireless line 7₁, Wireless base station 2₁,
Communication line 6₁And mobile communication switch 1₁Transfer via
The voice packet addressed to the fixed telephone 500,
Mobile terminal (MS) 3 to wireless line 7₂, Wireless base station
Two₂, Communication line 6₂, Mobile telecommunication switch 1₂, Communication line 5
And mobile communication switch 1₁What is transferred via
Judgment is made, and thereafter, from the fixed telephone 500 to the mobile communication switching system 1₁
Coded the analog format voice signal transferred to
The packet communication device 1 is digitally encoded by the unit 13.
Transfer of voice packet (ff) packetized by 7
Road, communication line 6 so far₁, Wireless base station 2₁And nothing
Line line 7 ₁Via, communication line 5, mobile telecommunication switch
1₂, Communication line 6₂, Wireless base station 2₂And wireless line 7
₂Transfer to change to via and add to voice packet (ff)
Change route information accordingly and move via communication line 5
Telecommunication switch 1₂Transfer to.

The mobile communication exchange 1 ₂ having received the voice packet (ff) analyzes the added transfer route information,
Transfer to the wireless base station 2 ₂ via the communication line 6 ₂ . Upon receiving the voice packet (ff), the wireless base station 2 ₂ analyzes the added transfer route information and transfers it to the mobile terminal (MS) 3 via the wireless line 7 ₂ .

The mobile terminal (MS) 3 transfers the voice packet (ee) to the wireless base station 2 ₂ via the wireless line 7 ₂ and then from the wireless base station 2 ₁ to the wireless line 7 _1. Voice packet (ff) transferred by the wireless base station 2 ₂
From the wireless base station 2 ₂ to the wireless line 7 ₂ by setting the wireless transmission / reception unit 32 _{a so} that the voice packet (ff) transferred from the wireless line 7 ₂ via the wireless line 7 ₂ can be received in parallel.
_When the voice packet (ff) transferred via ₂ is received, it is determined that the transfer routes of the voice packets (ee) and (ff) transmitted to and received from the fixed telephone 500 have been switched, and the wireless base station 2 _The voice packet (ff) transferred from ₁ via the wireless line 7 ₁ is stopped, and the voice packet passing through the wireless line 7 ₁ , the wireless base station 2 ₁ , the communication line 6 ₁ and the mobile communication switch 1 ₁ is stopped. Packet (ee)
Packet route release signals (gg) for releasing (?) The transfer routes of (ff) and (ff) are created and transferred to the radio base station 2 ₁ .

As is clear from the above description, the present embodiment
According to this, the mobile terminal (MS) 3 receives the power from each radio base station 2.
Optimum communication target wireless base station 2 that monitors the reception level of waves
The mobile terminal (MS) 3 to determine the radio base station 2₁of
From wireless zone to wireless base station 2 ₂Moved to the wireless zone
In this case, the wireless base station 2 that has been the communication target until now ₁
The wireless base station 2₂Changed to wireless base station 2₂Through
Then, the voice packet (ee) is transmitted, and the call control exchange
A mobile telecommunication switch 1₁Is transferred from the mobile terminal (MS) 3.
Analyze the transfer route information of the sent voice packet (ee)
By changing the transfer route of voice packet (ee)
Packet that recognizes and transfers to mobile terminal (MS) 3
Since the transfer path of (ff) is also changed, transfer path switching control
The procedure is also as shown in FIG. 5, as compared with the conventional method shown in FIG.
Greatly simplified.

Further, since all mobile terminals (MS) 3 transmit and receive by voice packets (ee) and (ff), voice packets (ee) or (f) are also used when switching the transfer route.
Unless f) is lost, the voice signal will not be interrupted and noise will not occur.

2 to 6 are merely examples of the present invention until now, for example, the mobile communication switchboard 1 and the radio base station 2
The configuration of the mobile terminal (MS) 3 is not limited to that shown in the figure, and various modifications are considered,
In any case, the effect of the present invention does not change. Needless to say, the mobile communication network 100 to which the present invention is applied is not limited to the one shown in the figure.

[0056]

As described above, according to the present invention, even when a mobile terminal moves in the mobile communication network and it is necessary to switch the communication path, the mobile terminal determines an optimum radio base station as a communication target. However, the mobile communication exchange controls the wireless base station to control the switching of the communication path, which greatly simplifies the procedure for controlling the communication path switching. Generation of noise due to switching is also significantly reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing the principle of the present invention.

FIG. 2 is a diagram showing a mobile terminal according to an embodiment of the present invention.

FIG. 3 is a diagram showing a radio base station according to an embodiment of the present invention.

FIG. 4 is a diagram showing a mobile communication exchange according to an embodiment of the present invention.

FIG. 5 is a diagram showing a transfer path switching process according to an embodiment of the present invention.

FIG. 6 is a diagram showing an example of a mobile communication network to which the present invention is applied.

FIG. 7 is a diagram showing an example of a conventional mobile terminal.

FIG. 8 is a diagram showing an example of a conventional radio base station.

FIG. 9 is a diagram showing an example of a conventional mobile communication exchange.

FIG. 10 is a diagram showing an example of a conventional channel switching process.

[Explanation of symbols]

1 Mobile Communication Switch 2 Radio Base Station 3 Mobile Terminal (MS) 4, 5, 6 Communication Line 7 Radio Line 11, 23 Call Path Section 12 Call Path Control Section 13, 33 Voice Code Decoding Section 14, 14 _a Mobile Call Control Part 15 Home memory part 16 Radio base station control part 17, 25, 37 Packet communication device 21, 31 Antenna 22, 32, 32 _a Radio transmission / reception part 24 Base station control part 34 Handset 35, 35 _a Terminal control part 36, 36 _a level monitoring unit 100 mobile communication networks 101, 301 voice packet transmission / reception means 102 transfer path control means 201 voice packet transfer means 302 communication target base station determination means 400 fixed telephone network 500 fixed telephone

Claims (1)

[Claims] 1. A mobile communication network comprising a plurality of mobile communication exchanges (1), a plurality of radio base stations (2), and a plurality of mobile terminals (3), wherein each mobile terminal in the mobile communication network is a mobile communication network. The mobile communication exchange (1) that first accepts the call to and from (3) operates as a call control exchange that manages the call until the call is released, and the mobile terminal (3) is extant. Communication target base station determining means (302) for determining an optimum wireless base station (2) as a communication target according to the position, and packetizing voice transmitted by the user of the mobile terminal (3) to obtain the communication target base station. A voice packet transmitting / receiving unit (301) for transmitting to the radio base station (2) determined by the determining unit (302), receiving a voice packet transmitted from the radio base station (2), and converting the voice packet back to voice. And the mobile communication switch In 1), voice transmitted to the mobile terminal (3) controlled as the call control exchange is packetized, transferred to the mobile terminal (3) via the radio base station (2), and the mobile A voice packet transmitting / receiving means (101) for receiving a voice packet transmitted from the terminal (3) and converting the voice packet into a voice, and a transfer route of the voice packet transferred from the mobile terminal (3), and monitoring the transfer route. And a transfer route control unit (102) for changing the transfer route of the voice packet transferred by the voice packet transmitting / receiving unit (101) to the mobile terminal (3) based on the monitoring result. The radio base station (2) is provided with voice packet transfer means (201) for transferring voice packets transmitted and received between the mobile terminal (3) and the mobile communication exchange (1). Mobile switching system to be.