JPH0638265A - Mobile terminal equipment direct-coupling system - Google Patents

Abstract

PURPOSE:To save number of radio channels and wired lines possessed by a mobile communication network by acquiring a radio line to command connection to each mobile terminal equipment when a discrimination means discriminates that mobile terminal equipment of concerned communication network are found in the same radio zone. CONSTITUTION:A direct connection request means 301 makes a request of direct communication with other mobile terminal equipment in a same radio zone to an exchange 1 via a radio channel 5. The discrimination means 101 discriminates whether or not a mobile terminal equipment 3 requesting the direct communication and other terminal equipment 3 to be a called party are in a same radio zone. An acquisition means 102 acquires one radio line used for the direct communication when the means 101 discriminates it that the terminal equipment 3 requesting the direct communication and the communication opposite party mobile terminal equipment 3 are in existence in the same radio zone. A command means 103 commands the connection to the acquired radio channel 5 by the means 102 to the terminal equipment 3. Upon the notice of the channel 5 for the direct communication from the exchange 1, a connection means 302 makes communication with the other terminal equipment 3 via the channel 5.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art FIG. 6 is a diagram showing an example of a conventional mobile communication network. The mobile communication network shown in FIG.
, A plurality of base stations 2 (individual base stations are referred to as 2 ₁ , 2 _2, etc.), and a plurality of mobile terminals 3 (individual mobile terminals 3 ₁ ,
3 ₂ etc.], the exchange 1 and each base station 2 are connected by a plurality of wired lines 4, respectively.
Further, each base station 2 has a plurality of wireless lines 5 in each communicable range (so-called wireless zone 6) with the mobile terminal 3.

It is assumed that the wireless lines 5 are installed in a time-division manner for three lines for each radio wave of each frequency transmitted by each base station 2 and each mobile terminal 3. In the exchange 1, a call path device 1 for setting a call path for a call to / from a mobile terminal 3
1 and a central processing unit 12 for controlling calls to and from the mobile terminal 3, and various control signals are transmitted and received between the mobile terminal 3 and the central processing unit 12 via the base station 2 in order to control the calls. A base station control device 13 for controlling each mobile terminal 3
Includes a wireless transmission / reception unit 31 that communicates with the base station 2 via the wireless line 5, and a wireless transmission / reception unit 31 that digitally encodes an analog audio signal transmitted from the handset 33.
And a digital decoding unit 32 for decoding the digitally encoded voice signal transmitted from the wireless transmission / reception unit 31 into an analog format and transmitting it to the handset 33, the wireless transmission / reception unit 31, the code decoding unit 32, and the transmission / reception unit. A terminal control unit 34 for controlling the device 33 is provided.

The base station 2 connects and disconnects the wired line 4 and the wireless line 5 under the control of the exchange 1. In FIG. 6, when a mobile terminal 3 ₁ existing in the wireless zone 6 ₁ of the base station 2 ₁ makes a call with another mobile terminal 3 ₂ existing in the wireless zone 6 ₂ of the base station 2 ₂ , Exchange 1
The base station controller 13 in the mobile terminal 3 transmits and receives various control signals to and from the mobile terminals 3 ₁ and 3 ₂ , so that the central processing unit 12 sends the mobile terminal 3 ₁ a wireless line 5 ₁₁ and a wired line 4 _11. The wireless line 5 ₂₂ and the wired line 4 ₂₂ to the mobile terminal 3 ₂ , the base station 2 ₁ connects the wireless line 5 ₁₁ and the wired line 4 ₁₁ , and the base station 2 ₂
Connects the wireless line 5 ₂₂ and the wired line 4 ₂₂ and the speech path device 11 in the exchange 1 connects the wired lines 4 ₁₁ and 4 _22. Further, the central processing unit 12 in the exchange 1 connects the mobile terminal 3 ₁ Holds call control information for 3 and 3 ₂ .

From the above, the mobile terminals 3 ₁ and 3 ₂ are connected to the radio lines 5 ₁₁ and 5 ₂₂ and the base stations 2 ₁ and 2 2.
_2, make a call to each other via the channel device 11 of wire line 4 ₁₁ and 4 _22, and the exchange 1.

When the mobile terminal 3 ₂ moves from the wireless zone 6 ₂ to the wireless zone 6 ₁ during a call, when the central processing unit 12 in the exchange 1 detects the movement via the base stations 2 ₂ and 2 _1. , The wireless line 5 ₁₂ and the wired line 4 ₁₂ are captured for the mobile terminal 3 ₂ , and the base station 2 ₂ and the communication path device 1 are acquired.
1 is controlled to change the connection from the previously captured wireless line 5 ₂₂ and wired line 4 ₂₂ to the wireless line 5 ₁₂ and wired line 4 ₁₂ and update the held call control information.

As described above, the mobile terminal 3 ₁ and the mobile terminal 3 ₂ are connected to the wireless lines 5 ₁₁ and 5 ₁₂ , the base station 2 ₁ , the wired lines 4 ₁₁ and 4 ₁₂ , and the speech path device 11 in the exchange 1.
Talk to each other via.

[0008]

As is clear from the above description, in the conventional mobile communication network, the mobile terminal 3 ₁
Even when 3 and 3 ₂ make a call in the same wireless zone 6 ₁ , the wireless lines 5 ₁₁ and 5 ₁₂ and the wired lines 4 ₁₁ and 4 ₁₂ are captured and are connected by the base station 2 ₁ and the communication path device 11. Therefore, it is necessary to provide the wireless line 5 and the wired line 4 in consideration of the mutual call between the mobile terminals 3 in the same wireless zone 6.

An object of the present invention is to make it possible to reduce the number of wireless lines and wired lines owned by a mobile communication network as much as possible.

[0010]

FIG. 1 is a diagram showing the principle of the present invention. In FIG. 1, 1 is an exchange, 2 is a base station,
A mobile terminal 3 constitutes a mobile communication network to which the present invention is applied.

Reference numeral 101 denotes the same zone identifying means provided in the exchange 1 according to the present invention. Reference numeral 102 is a direct wireless line capturing means provided in the exchange 1 according to the present invention.
Reference numeral 103 denotes a direct connection instruction means provided in the exchange 1 according to the present invention.

Reference numeral 301 is a direct connection requesting means provided in the mobile terminal 3 according to the present invention. 302 is a direct connection means provided in the mobile terminal 3 according to the present invention.

[0013]

The respective mobile terminals existing in the same radio zone can mutually receive the respective transmitted radio waves.

The present invention makes use of the above principle to connect mobile terminals in the same wireless zone to each other only by a wireless line. The direct connection requesting means 301 requests the exchange 1 to directly communicate with another mobile terminal 3 in the same wireless zone via the wireless line 5.

The same zone identifying means 101 identifies whether or not the mobile terminal 3 and the communication partner mobile terminal 3 requesting direct communication currently exist in the same radio zone. The direct communication line capturing means 102 determines the wireless line 5 to be used for direct communication when the same zone identifying means 101 identifies that the mobile terminal 3 and the communication partner mobile terminal 3 requesting the direct communication exist in the same wireless zone. Capture one line.

The direct connection instruction means 103 instructs each mobile terminal 3 to connect to the wireless line 5 already captured by the direct wireless line capturing means 102. When the direct connection means 302 is informed of the wireless line 5 for direct communication from the exchange 1,
Communication is performed with another mobile terminal 3 via the wireless line 5 for direct communication.

Therefore, the mobile terminals in the same radio zone can communicate by occupying only the radio line, the resources in the mobile communication network can be effectively used, and the economical efficiency of the mobile communication network is greatly improved. .

[0018]

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 communication network according to an embodiment of the present invention, FIG. 3 is a diagram showing an example of a direct connection process (first) in FIG. 2, and FIG. 4 is a direct connection process in FIG. FIG. 5 is a diagram showing an example of (2), and FIG. 5 is a diagram showing an example of a configuration of the direct communication wireless line in FIG. The same reference numerals denote the same objects throughout the drawings.

In FIG. 2, the same zone identification section 121 is provided in the central processing unit 12 in the exchange 1 as the same zone identification means 101 in FIG. 1, and the direct communication line capturing means 102 in FIG. The unit 122 is provided in the central processing unit 12, and the direct connection switching unit 123 is used as the direct connection instruction means 103 in FIG.
Further, a direct connection release unit 124 is provided in the central processing unit 12, a direct connection activation key (K ₁ ) 35 and a direct connection stop key (K ₂ ) 36 are provided as the direct connection requesting means 301 in FIG. As the direct connection means (302) in FIG. 1, the direct connection control unit 37 is the mobile terminal 3
It is provided in the internal terminal control unit 34.

[0020] The wireless zone 6 ₁ corresponding to the base station 2 ₁
The addition to the radio zone ₆₁ of the radio line 5 for connecting the each mobile terminal 3 extant base station 2 ₁ and the radio zone 6 in ₁
A direct wireless line 5 ₃ is provided to directly connect the existing mobile terminals 3 to each other.

As shown in FIG. 5, the direct communication line 5 ₃ has three slots (TS _A ), (TS _B ) and (T _B ).
S _C ) composed of radio waves of a predetermined frequency that are time-divided into
For example, when three mobile terminals 3 _A , 3 _B and 3 _C make a call via the direct radio line 5 ₃ , each mobile terminal 3
Slots (TS _A ) from _A , 3 _B and 3 _C respectively,
(TS _B ) and (TS _C ) are used to transmit transmitted voices, and mobile terminal 3 _A is made to receive the transmitted voices from mobile terminals 3 _B and 3 _{C in} slots (TS _B ) and (TS _C ), The mobile terminal 3 _B has slots (TS _C ) and (TS
_A) is receiving a transmitted voice from the mobile terminal 3 _C and 3 _A in a further transmitted voice from the mobile terminal 3 _A and 3 _B the mobile terminal 3 to _C slot (TS _A) and (TS _B) By receiving, up to three mobile terminals 3
Enables mutual communication via the direct radio line 5 ₃ .

First, an embodiment of the present invention will be described with reference to FIGS. 2, 3 and 5. 2, 3 and 5, the mobile terminal 3 ₁ extant radio zone 6 in ₁ which corresponds to the base station 2 _1, the radio zone 6 ₂ corresponding to the base station 2 ₂
The existing mobile terminal 3 ₂ is connected to the wireless lines 5 ₁₁ and 5
₂₂ , base stations 2 ₁ and 2 ₂ , wired lines 4 ₁₁ and 4 ₂₂ ,
In addition, the central processing unit 12 is connected to each other via the communication path device 11 in the exchange 1 to make a call, and the central processing unit 12 makes the mobile terminal 3 ₁
It is assumed that the call control information regarding 3 and 3 ₂ is being held.

In this state, if the mobile terminal 3 ₂ moves from the wireless zone 6 ₂ to the wireless zone 6 ₁ , the user of the mobile terminal 3 ₁ wants to shift to a call via a direct wireless line. Then, the direct connection activation key (K ₁ ) 35 provided in the mobile terminal 3 ₁ is operated.

The direct connection control unit 37 of the mobile terminal 3 in _1,
When the operation of the direct connection activation key (K ₁ ) 35 is detected, a direct connection activation signal (a) for requesting the switch 1 to shift to a call via a direct wireless line is created, and the base station 2 is activated. The data is transferred to the exchange 1 via a control signal line provided in common between the mobile terminal 3 and the exchange 1.

In the exchange 1, the central processing unit 12 sends the direct connection start signal (a) transferred from the mobile terminal 3 _1.
Is received and analyzed via the call path device 11 and the base station control device 13, and if the mobile terminal 3 ₁ recognizes that it desires to shift to a call via a direct wireless line, the same zone identification unit 121 To start.

The same-zone identification unit 121 that has been activated retains
The existing call control information and the existing wireless zone of each mobile terminal 3
By referring to the recorded information of the connection 6,
Mobile terminal 3 of transfer source of No. (a)₁And the moving end of the other party
End 3₂And the same wireless zone 6 ₁Identifies existing within
Then, the direct communication line capturing unit 122 is activated.

The activated direct communication line capturing unit 122 is
When _one direct communication wireless line 5 ₃ that can be used in the wireless zone 6 ₁ is captured, the direct connection switching unit 123 is activated. The activated direct connection switching unit 123 activates the mobile terminals 3 ₁ and 3
₂ was captured in notify direct radio line 5 _3, connected direct radio line 5 ₃ respectively via the radio line 5 ₁₁ and 5 ₂₂
Direct connection switching instruction signals (b ₁ ) and (b ₂ ) for instructing switching to the connection via the above are created and transferred to the mobile terminals 3 ₁ and 3 ₂ via the above-mentioned control signal line, respectively.

It should be noted direct switching instruction signal (b ₁₎ it is direct and transmitting the radio line 5 ₃ slots (TS _A), the slot (TS _B) instructs to receiving at, also direct switching instruction signal (b ₂ ) is to transmission in direct radio line 5 ₃ slots (TS _B), it is assumed for instructing to receiving the slot (TS _a).

[0029] In the mobile terminal 3 _1, the terminal control unit 34
When the direct connection control unit 37 therein receives and analyzes the direct switching instruction signal (b ₁ ) transferred from the exchange 1, the call with the mobile terminal 3 ₂ which has been transmitted and received via the wireless line 5 ₁₁ until now. a direct radio line 5 ₃ slots (TS _a) and via (TS _B) after controlling the radio transceiver 31 as switches to be transmitted and received, for notifying the completion of switching to the direct radio line 5 ₃ The direct switching completion signal (c ₁ ) is generated and transferred to the exchange 1 via the above-mentioned control signal line.

The mobile terminal 3₂Even in the terminal control unit
The direct connection control unit 37 in 34 is transferred from the exchange 1.
Direct communication switching instruction signal (b₂) Is received and analyzed, this
Up to wireless line 5_{twenty two}Mobile terminal 3 that was transmitting and receiving via₁
Direct call wireless line 5 ₃Slot (TS_B) Oh
And (TS_A) Switch to sending and receiving via
After controlling the wireless transmission / reception unit 31, the direct wireless line 5₃What
Direct switching completion signal (c₂)
Create and transfer to the exchange 1 via the control signal line described above.
It

In the exchange 1, inside the central processing unit 12
The direct connection switching unit 123 of the direct connection switching completion signal (c₁)
And (c₂) The communication path device 11 and the base station control device
Mobile terminal 3 has been received until now via 13₁And 3
₂Wireless line 5 that was occupied by calls between₁₁And 5_{twenty two},
Base station 2₁Inside wireless line 5₁₁And wired line 4₁₁Connection with,
Base station 2₂Inside wireless line 5_{twenty two}And wired line 4_{twenty two}Connection with,
Wired line 4₁₁And 4 _{twenty two}, And in the communication path device 11
Line line 4₁₁And 4_{twenty two}Releases the connection with and holds it accordingly
Update the call control information inside.

After that, the mobile terminals 3 ₁ and 3 ₂ talk with each other via the direct radio line 5 ₃ . If the mobile terminal 3 ₂ eventually moves from the wireless zone 6 ₁ to the wireless zone 6 ₂ , the user of the mobile terminal 3 ₂ requests the mobile terminal 3 ₂ to stop the call via the direct communication wireless line. The direct connection stop key (K ₂ ) 36 provided is operated.

The direct connection control unit 37 of the mobile terminal 3 in _2,
When the operation of the direct connection stop key (K ₂ ) 36 is detected, a direct connection stop signal (d) for requesting the switch 1 to stop the call through the direct wireless line is created, and the control signal line described above is generated. To the exchange 1 via.

[0034] In exchange 1, the central processing unit 12 receives and analyzes the transferred direct disconnection signal (d) from the mobile terminal 3 _2, Willing mobile terminal 3 ₂ to stop the call via the direct radio line When recognizing that the direct connection is released, the direct connection release unit 124 is activated.

The activated direct connection release unit 124 refers to the held call control information and the recorded information of the existing wireless zone 6 of each mobile terminal 3 to determine the transfer source of the direct connection stop signal (d). the mobile terminal 3 _2, the moving of the other party terminal 3 ₂ is in a call via a direct radio line 5 _3, when identifying the extant radio zones ₆₁ and 6 in _2, respectively, the base station 2 ₁ And 2 ₂ are controlled to capture the wireless lines 5 ₁₁ and 5 ₂₂ , the wired lines 4 ₁₁ and 4 ₂₂ ,
Further, the wireless line 5 ₁₁ and the wired line 4 ₁₁ are connected via the base station 2 ₁ , the wireless line 5 ₂₂ and the wired line 4 ₂₂ are connected via the base station 2 _2, and the wired lines 4 ₁₁ and 4 _{22 are} further connected.
To the direct line 5
Create the direct stop instruction signals (e ₁ ) and (e ₂ ) for instructing the switching of the connection via ₃ to the connection via the wireless lines 5 ₁₁ and 5 ₂₂ respectively, and connect via the control signal line described above. To the mobile terminals 3 ₁ and 3 ₂ , respectively.

In the mobile terminal 3 ₁ , the terminal control unit 34
When the direct connection control unit 37 therein receives and analyzes the direct stop instruction signal (e ₁ ) transferred from the exchange 1, the slots (TS _A ) and (TS _B ) of the direct wireless line 5 _{3 have been used} so far.
After controlling the wireless transmission / reception unit 31 so that the call with the mobile terminal 3 ₂ transmitted / received via the wireless communication line 5 ₁₁ is switched to the transmission / reception via the wireless line 5 ₁₁ , the completion of suspension of use of the direct communication wireless line 5 ₃ is notified A direct stop completion signal (f ₁ ) is created for this purpose and is transferred to the exchange 1 via the above-mentioned control signal line.

[0037] Also in the mobile terminal 3 _2, the direct-connection control unit 37 in the terminal control unit 34 receives and analyzes the direct stop instruction signal transferred from the exchange 1 (e _2), which until direct radio line 5 ₃ slots (TS _B ) and (TS
After controlling the wireless transmission / reception unit 31 to switch the communication with the mobile terminal 3 ₁ transmitted / received via _A ) to the transmission / reception via the wireless line 5 ₂₂ , the direct communication line 5 ₃
A direct stop completion signal (f ₂ ) for notifying the completion of use stop is created and transferred to the exchange 1 via the above-mentioned control signal line.

In the exchange 1, the direct connection release section 124 in the central processing unit 12 has a direct communication stop completion signal (f ₁ ).
When (f ₂ ) and (f ₂ ) are received via the communication path device 11 and the base station control device 13, the mobile terminals 3 ₁ and 3 have been used so far.
_The direct communication wireless line 5 ₃ occupied by the call between the _two is released, and the call control information being held is updated accordingly.

Thereafter, the mobile terminals 3 ₁ and 3 ₂ are connected to the radio lines 5 ₁₁ and 5 ₂₂ , the base stations 2 ₁ and 2 ₂ , and the wire line 4 _{11 respectively.}
And 4 ₂₂ and the call path device 11 is used to talk to each other.

As is clear from the above description, FIGS.
And according to the embodiment shown in FIG. 5, the mobile terminal 3₁When
Mobile terminal 3 during a call₂But mobile terminal 3₁Same wireless
6₁When moving to the mobile terminal 3₁Has a direct connection
Start key (K₁) By operating 35
6₁Direct wireless line 5 within₃Direct call is possible via
And mobile terminal 3₁And 3₂Occupied for calls between
Wireless line 5 ₁₁And 5_{twenty two}, Base station 2₁Nothing in
Line 5₁₁And wired line 4₁₁Connection with the base station 2 ₂Nothing in
Line 5_{twenty two}And wired line 4_{twenty two}Connection with, wired line 4₁₁And
And 4_{twenty two}, And the wired line 4 in the communication path device 11₁₁And 4_{twenty two}
It is possible to release the connection with.

Next, another embodiment of the present invention will be described with reference to FIGS.
It will be described with reference to FIG. In FIGS. 2, 4 and 5, when the mobile terminal 3 ₁ existing in the radio zone 6 ₁ corresponding to the base station 2 ₁ makes a call to the mobile terminal 3 ₂ existing in the same radio zone 6 ₁ . First, when the user of the mobile terminal 3 ₁ requests allocation of the wireless line 5 in the wireless zone 6 ₁ , the direct connection activation key (K ₁ ) 35 is operated.

The direct connection control unit 37 of the mobile terminal 3 in _1,
When the operation of the direct connection start key (K ₁ ) 35 is detected, a direct wireless line allocation request signal (g) for requesting the exchange 1 to allocate the direct wireless line 5 ₃ is created, and the control signal line described above is generated. To the exchange 1 via.

In the exchange 1, the central processing unit 12 receives and analyzes the direct radio line allocation request signal (g) transferred from the mobile terminal 3 ₁ via the communication channel device 11 and the base station control device 13, When recognizing that the mobile terminal 3 ₁ requests the allocation of the direct wireless line, the same zone identification unit 121 is activated and it is confirmed that the mobile terminals 3 ₁ and 3 ₂ are present in the same wireless zone 6 ₁ . Then, the direct communication line capturing unit 122 is activated.

The activated direct communication line capturing unit 122 is
When _one direct communication wireless line 5 ₃ that can be used in the wireless zone 6 ₁ is captured, the direct connection switching unit 123 is activated. The activated direct connection switching unit 123 activates the mobile terminals 3 ₁ and 3
₂ is notified of the captured direct communication wireless line 5 ₃ and direct communication switching instruction signals (b ₁ ) and (b ₂ ) for instructing connection via the direct communication wireless circuit 5 ₃ are created, and the control signal line described above is generated. To the mobile terminals 3 ₁ and 3 ₂ , respectively.

[0045] In the mobile terminal 3 _1, the terminal control unit 34
When the direct connection control unit 37 therein receives and analyzes the direct switching instruction signal (b ₁ ) transferred from the exchange 1, transmission / reception is performed via the slots (TS _A ) and (TS _B ) of the direct wireless line 5 _3. After controlling the wireless transmission / reception unit 31 as described above, a direct communication switching completion signal (c ₁ ) for notifying the completion of connection to the direct communication wireless line 5 ₃ is created and transferred to the exchange 1 via the control signal line described above. To do.

In the mobile terminal 3 ₂ as well, when the direct connection control unit 37 in the terminal control unit 34 receives and analyzes the direct switching instruction signal (b ₂ ) transferred from the exchange 1, the direct communication line 5 ₃ is connected. After controlling the wireless transmission / reception unit 31 so as to transmit / receive via the slots (TS _B ) and (TS _A ), create a direct switching completion signal (c ₂ ) for notifying completion of connection to the direct wireless line 5 ₃ . Then, the data is transferred to the exchange 1 via the above-mentioned control signal line.

Thereafter, the mobile terminal 3 ₁ transfers the call setup message SETUP to the exchange 1 via the above-mentioned control signal line in accordance with a known call setup procedure, and the call setup message SE.
The central processing unit 12 of the exchange 1 which has received the TUP transfers the call setup message SETUP to the mobile terminal 3 ₂ via the control signal line described above, a call setup message SETUP
The mobile terminal 3 _{2 which} has received the call displays the call to the user and transfers the call message ALERT to the exchange 1 via the above-mentioned control signal line.
The central processing unit 12 in the exchange 1 which has received the call message sends the call message AL to the mobile terminal 3 ₁ via the above-mentioned control signal line.
Mobile terminal 3 ₂ that transferred ERT and the user responded
Transfers the response message CONN to the exchange 1 via the above-mentioned control signal line, and the central processing unit 12 in the exchange 1 which receives the response message CONN sends the response message CONN to the mobile terminal 3 ₁ via the above-mentioned control signal line. Transfer the response message CONN.

After that, the mobile terminals 3 ₁ and 3 ₂ start a call via the direct communication wireless line 5 ₃ . As is clear from the above description, according to the embodiments shown in FIGS. 2, 4 and 5, when the mobile terminal 3 ₁ makes a call to the mobile terminal 3 ₂ in the same radio zone 6 ₁ , the mobile terminal 3 ₁ When the user of 3 ₁ operates the direct connection activation key (K ₁ ) 35, the call can be set up via the direct wireless line 5 ₃ in the wireless zone 6 ₁ , and like the conventional mobile communication network. The wireless lines 5 ₁₁ and 5 ₁₂ , the wireless line 5 ₁₁ in the base station 2 ₁ and the wired line 4 ₁₁
Connection, the connection between the radio line 5 ₁₂ and wire line 4 _12, it is possible to release the connection between the wire line 4 ₁₁ and 4 ₁₂ of wire lines 4 ₁₁ and 4 _12, and a channel device 11 with .

It is to be noted that FIGS. 2 to 5 are merely examples of the present invention until now, and for example, the direct communication radio line 5 ₃ is not limited to the one provided exclusively in each radio zone 6, and
Many other modifications can be considered, such as diversion of an arbitrary free wireless line 5 in each wireless zone 6, but the effect of the present invention does not change in any case. Direct connection start signal (a)
Etc. transferred from the mobile terminal 3 _1, also direct disconnection signal (d) are not to be limited to those to be transferred from the mobile terminal 3 _2, transmitted from the other mobile terminal 3 ₂ or 3 _1, other Many variations are considered, but in any case, the effect of the present invention does not change. It goes without saying that the configurations of the exchange 1, the mobile terminal 3 and the mobile communication network which are the subject of the present invention are not limited to those shown in the drawings.

[0050]

As described above, according to the present invention, in the mobile communication network, the mobile terminals in the same radio zone can communicate with each other by occupying only the radio line, and the resources in the mobile communication network can be effectively used. Therefore, the economical efficiency of the mobile communication network is significantly improved.

[Brief description of drawings]

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

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

FIG. 3 is a diagram showing an example of a direct connection process (first) in FIG.

FIG. 4 is a diagram showing an example of a direct connection process (2) in FIG.

5 is a diagram showing an example of a configuration of a direct wireless line in FIG.

FIG. 6 is a diagram showing an example of a conventional mobile communication network.

[Explanation of symbols]

1 Switchboard 2 Base Station 3 Mobile Terminal 4 Wired Line 5 Wireless Line 5 ₃ Direct Wireless Line 6 Wireless Zone 11 Speech Channel Device 12 Central Processing Unit 13 Base Station Control Device 31 Radio Transmitter / Receiver 32 Code Decoder 33 Handset 34 Terminal Control 35 direct connection start key (K ₁ ) 36 direct connection stop key (K ₂ ) 37 direct connection control unit 101 same zone identification means 102 direct communication wireless line capturing means 103 direct connection instruction means 121 same zone identification unit 122 direct communication wireless line capturing unit 123 direct connection switching unit 124 direct connection release unit 301 direct connection requesting means 302 direct connecting means

Claims (1)

[Claims] 1. A mobile having a plurality of mobile terminals (3) moving in an area divided into a plurality of radio zones and an exchange (1) for controlling a call to and from the mobile terminals (3). In the communication network, to the exchange (1), each mobile terminal (3) directly communicates with another mobile terminal (3) in the same wireless zone via a wireless line (5). Direct connection requesting means (301) for requesting, and wireless line (5) for direct communication from the exchange (1)
Is notified, the wireless line for direct communication (5)
A direct connection means (302) for communicating with the other mobile terminal (3) via the mobile terminal (3) is provided, and the mobile terminal (3) and the communication partner requesting the direct communication to the exchange (1). Same-zone identifying means (1) for identifying whether or not the mobile terminal (3) currently exists in the same wireless zone.
01) and the same zone identifying means (101) identifies that the mobile terminal (3) and the communication partner mobile terminal (3) requesting the direct communication are present in the same wireless zone, and are used for the direct communication. A direct wireless line capturing means (102) for capturing one wireless line (5) to be activated and a connection to the wireless line (5) captured by the direct wireless line capturing means (102) are connected to each mobile terminal (3). A direct connection method for a mobile terminal, characterized in that a direct connection instructing means (103) for instructing is provided.