JPH09307943A - Mobile communication system - Google Patents

Abstract

(57) Abstract: In a mobile communication system, when a mobile station is handed over, a base station in a call and an adjacent base station are preliminarily made into a plurality of conference calls to make a handover reservation, thereby shortening the handover time. It aims to increase the success rate. SOLUTION: The strength of the radio wave of a mobile station is detected by an adjacent base station or the like by a movement predicting means, and an interrupt is issued to an exchange. The switching center is configured to interrupt the call path between the mobile station and the device of the communication partner to enter a conference call state and make a handover reservation for the mobile station.

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 using a plurality of base stations connected to a switching center and a plurality of mobile stations moving within a service area formed by a communication zone formed by these base stations. It is a thing. In particular, the present invention relates to a base station switching operation (handover, hereinafter also referred to as HO) when a mobile station in communication moves.

[0002]

2. Description of the Related Art FIG. 13 is a diagram showing an outline of a system for explaining HO (handover) in a conventional mobile communication system. In the figure, 1 is an exchange, 2a, 2
b is each base station connected to the exchange 1 by the wired lines 5a and 5b, 6a and 6b are communication zones formed by these base stations 2a and 2b, and 3 is a mobile station and communication zones 6a and 6b.
Inside, it wirelessly communicates with the base stations 2a and 2b. A telephone 4 is connected to the exchange 1 through a wired line 5c.
Although FIG. 13 shows two base stations and one mobile station and one telephone, respectively, the system is generally configured with one or more each. Exchange 1
Base station 2 connected by wired lines 5a, 5b, 5c
a, 2b, and the telephone 4 are controlled. Mobile station 3
Communicates with the telephone 4 and other mobile stations through the base stations 2a and 2b.

FIG. 14 is a schematic diagram for explaining a base station and a communication zone formed by the base station. The communication zone is
The strength of the radio wave (electric field strength) varies depending on the distance from the base station, and the strength of the radio wave decreases as the distance from the base station increases.
In FIG. 14, reference numeral 8 denotes a handover point for the mobile station 3 to perform handover when the strength of the radio wave becomes small,
Reference numeral 9 represents a communication limit point at which the base station and the mobile station shown in the figure can communicate.

Next, the operation will be described. FIG.
It is the figure which showed the sequence for demonstrating the conventional hand-over (HO). The "8 points" in FIG. 15 indicates that the mobile station moves to the handover point 8 in FIG. The mobile station 3 and the telephone 4 are communicating (calling) with each other through the base station 2a and the exchange 1. The mobile station 3 moves from the base station 2a toward the base station 2b and reaches the "8 points". The mobile station 3 detects the strength of the radio wave from the base station 2a and the error bit of communication, and when it reaches the prescribed level for activating the handover, it activates the handover operation. The activation of the handover operation is generally based on the detection of the strength of the radio wave and the communication error bit. In this conventional example, the mobile station performs the detection, but the base station may have a similar function to activate the handover operation. When the handover operation is activated,
The mobile station 3 switches to the control channel and transmits the call continuation signal 101 to the base station 2b. FIG. 16 shows an example of the format of the call continuation signal. In FIG. 16, 902 is synchronization information for synchronization, 904 is a system ID, and 906 is a signal. Further, 908 is a portable device ID which is an identifier of a mobile station, and 910 is a base station ID. Various control information is exchanged according to the value written in the signal 906. For example, "00" is a call continuation signal and "01" is a call continuation acceptance signal. FIG. 17 is a diagram showing a flow of information from the mobile station 3 to the base station 2a and the exchange 1. In this figure, the base station 2a
Uses four speech channels A to D, and the transmission to the exchange is transmitted in a format in which the four channels are multiplexed. One channel of multiplexed information has the format shown in FIG. When the base station 2b of the moving destination receives the communication continuation signal 101 as shown in FIG.
Communication continuation signal 1 together with mobile station number (portable device ID)
02 is sent. The exchange 1 recognizes that the request is for a handover from the mobile station 3, switches the line from the base station 2a to the base station 2b, and transmits a call continuation acceptance signal 103 to the base station 2b. To do. The base station 2b is
The call continuation acceptance signal 104 is sent to the mobile station 3 with an empty call channel attached, and the call channel is switched to. The mobile station 3 receives the call continuation acceptance signal 10 from the base station 2b.
When 4 is received, the channel for control is switched to the channel for call and the call with the base station 2b is started. Base station 2a
Then, since the communication with the mobile station 3 is lost, the disconnection operation is performed.

[0005]

The handover in the conventional mobile communication system is performed as described above, and when the mobile station arrives at the handover point, the handover operation starts from the beginning. There is a problem that handover takes a long time, and the handover fails at the time when the call is interrupted during the call or the communication zone is complicated.

The present invention has been made in order to solve the above-mentioned problems, and while taking the same communication form, the time required for handover when a mobile station performs a handover is suppressed as much as possible, and the communication zone It is an object of the present invention to provide a communication mode in which handover succeeds regardless of the above conditions.

[0007]

The mobile communication system of the present invention is a first communication system for connecting the first base station and the relay means.
A base station connection means, the first intra-zone connection means, the relay means connected by the first base station connection means, and the first base station to establish a first communication path. First communication means for communicating a communication partner with the mobile station, movement determination means for determining the movement of the mobile station from the first communication zone to the second communication zone, and determination by the movement determination means A second zone for connecting the second base station and a mobile station located in the second communication zone with the movement of the mobile station from the first communication zone to the second communication zone. A second base station connection means for connecting the second base station and the relay means prior to the connection between the second base station and the mobile station by the internal connection means and the second intra-zone connection means. And the second intra-zone connection means and the second base station connection means A second communication means for setting a second communication path through the relay means and the second base station, which are connected to each other, to communicate the mobile station with the communication partner. .

The second base station connecting means is activated by the second base station.

The second base station connection means is activated by the relay means.

The mobile communication system further comprises movement predicting means for predicting movement of the mobile station from the first communication zone to the second communication zone, and the second base station connecting means is the above-mentioned. The second base station and the relay means are connected according to the prediction of the movement prediction means.

The second base station connecting means is characterized in that the second base station is connected to the relay means immediately after the communication between the mobile station and the communication partner is started.

[0012] The movement predicting means is arranged in the second base station.

The movement predicting means is arranged in the mobile station.

The movement predicting means is arranged in the first base station.

The movement prediction means is characterized in that it notifies the second base station connection means by outputting a prediction notification signal for notifying the movement prediction.

The relay means holds base station information for storing information on the first and second base stations forming the first and second communication zones, respectively, and the relay means holds the prediction notification. A signal is input, the second base station is determined with reference to the base station information, and a handover reservation signal is transferred.

In the mobile communication system, the relay means is
The second base station connecting means is arranged in an exchange station which is connected to the first and second base stations and can communicate with the communication partner.
The switching center and the second base station are connected.

In the mobile communication system, the relay means is
It is arranged in a relay device connected to the first and second base stations and an exchange station capable of communicating with the communication partner, and the second base station connection means is the relay device and the second base station. It is characterized by connecting and.

In the mobile communication system, the relay means is
It is arranged in the first base station, and the second base station connection means connects the first base station and the second base station.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. Embodiments of the present invention will be described below with reference to the drawings. The system configuration of this embodiment is the same as the system configuration of FIG. 13 shown in the description of the conventional technique. FIG. 1 is a block diagram showing the configuration of the mobile communication system of the present invention. In the figure, 100 is a relay means for relaying communication between a mobile station and a communication partner via any of the base stations, 11 is a first in-zone connection means for connecting the mobile station 3 and the base station 2a, 12 Is a first base station connection means for connecting the base station 2a and the relay means 100, 13 is a first intra-zone connection means 11 and a first base station connection means 1
2 is a first communication means that enables the mobile station 3 to communicate with the communication partner via the relay means 100 and the base station 2a, and 21 is a second intra-zone connection means that connects the mobile station 3 and the base station 2b. , 22 are second base station connection means for connecting the base station 2b and the relay means 100, and 23 is the relay means 1 by the second intra-zone connection means 21 and the second base station connection means 22.
00 is a second communication means that enables communication between the mobile station 3 and the communication partner via the base station 2b. Further, 30 is a movement judging means for judging the movement of the communication zone of the mobile station, and 40
Is a movement predicting means for predicting the movement of the mobile station to the adjacent communication zone. The movement determination means 30 may be arranged in the mobile station 3. The other reference numerals are the same as those shown in the conventional example, and the description thereof will be omitted.

FIG. 2 is a schematic diagram for explaining a base station and a communication zone formed by the base station. In the communication zone, the strength of the radio wave (electric field strength) varies depending on the distance from the base station, and the strength of the radio wave decreases as the distance from the base station increases. FIG. 2 is a schematic diagram for explaining the operation at the time of handover between the base station and the mobile station depending on the strength of the radio wave from the base station.
Is the HO explained in the operation of the embodiment of the present invention.
A HO reservation signal generation point at which a reservation signal (or interrupt transmission) is generated, 8 is a point (handover point) for the mobile station to perform handover, and 9 is a communication limit for communication between the base station and the mobile station shown in the figure. Represents a point. The HO reservation signal generation point 7, the handover point 8 and the communication limit point 9 are set in consideration of the communication state and the communication quality, but the setting is arbitrary depending on the strength of the radio wave and the detection value of the communication error bit. Is set to. In the following embodiments, the case where the relay unit 100 is an exchange station connected to the base stations 2a and 2b by a wired line will be described as an example. Further, the movement predicting means 40 is arranged in the base station 2b, and the movement determining means 3
It is assumed that 0 is placed in the mobile station 3.

Next, the operation will be described. FIG. 3 is a sequence diagram for explaining the handover method according to the first embodiment of the present invention, including “7 points”, “8 points”,
The “9 points” respectively indicate the HO reservation signal (interrupt transmission) generation point 7, the handover point 8 and the communication limit point 9 in FIG. The mobile station 3 includes the first intra-zone connection means and the first intra-zone connection means.
With the base station connecting means, a telephone call is made with the telephone 4 via the base station 2a and the exchange 1. As the mobile station 3 moves away from the base station 2a, the strength of the communication radio wave with the base station 2a decreases. Since the communication zones formed by the base stations are adjacent to each other, moving the mobile station away from the base station 2a means approaching another base station 2b. Further, all base stations always receive the radio waves of mobile stations located in adjacent base stations. "7
When the "point" is reached, the movement prediction means 40 of the base station 2b, which is a base station adjacent to the base station 2a and is in the moving direction of the mobile station 3, receives the radio wave transmitted by the mobile station 3 and By detecting that the strength of is greater than or equal to an arbitrarily set value, the handover reservation operation for the mobile station 3 is started. The handover reservation operation of the base station 2b will be continuously described. The base station 2b that receives the radio wave of the mobile station 3 makes an interrupt call 110 (hereinafter,
It is also called an interrupt transmission signal).

FIGS. 4 and 5 are views showing a part of the format of the interrupt transmission signal. FIG. 4 is a format in the case where the mobile station number of the mobile station 3 is in the channel in communication, and includes the mobile station number 500 and the idle call channel number 510 in the base station 2b. FIG. 5 is a format when the number of the mobile station 3 does not exist in the channel in communication,
Instead of the mobile station number 500, the channel number 512 that received the radio wave of the mobile station is included. As shown in FIGS. 4 and 5, the interrupt transmission signal includes the number of the mobile station 3 which is found by analyzing the received radio wave or the channel number of the received radio wave. Further, it includes a free call channel number in the base station 2b. As shown in FIG.
When there is no mobile station 3 number in the channel in communication, the mobile station number is determined on the exchange side by notifying the exchange station of the received channel number. At the exchange 1, the mobile station number of the interrupt transmission signal or the channel number of the radio wave
The processing corresponding to the handover reservation of the mobile station 3 is performed.

FIG. 6 is a diagram of a table managed by the exchange. In the figure, 520 is a base station ID and 522
Is a channel number and 524 is a mobile station number. The contents of this table are for collation, and are rewritten according to the actual channel use status or reservation status, and the content changes moment by moment.

The switching center 1 carries out an interruption process from the base station 2b for a call between the mobile station 3 and the telephone set 4, and the second base station connecting means connects the base station between the mobile station 3 and the base station 2b. A call path using the idle call channel notified from the station 2b is set, and a conference call state is set by the three parties of the mobile station 3, the telephone set 4, and the base station 2b. The communication path between the base station 2b and the exchange 1 at this time is connected, but as shown at 112, it is in a silent state. Further, the switching center 1 transmits the idle call channel number set as the base station 2b to the mobile station 3 as the reservation completion signals 114 and 116 through the call channel in communication from the base station 2a. , Notifies that the handover reservation has been secured. The reservation completion signal at this time may be transmitted by including information from a plurality of adjacent base stations. Alternatively, information from a plurality of adjacent base stations may be transmitted later at intervals. Mobile station 3
When the “8 points” is reached, the movement determination means 30 detects the strength of the radio wave from the base station 2a and the communication error bit, and it is determined that the predetermined level for activating the handover operation is reached. In this case, the handover operation is activated by switching to the control channel and transmitting the call continuation signal 118 to the base station 2b. Base station 2b
Then, when the call continuation signal 118 is received, since the reservation request has been completed from the mobile station 3 for which the reservation has already been completed and the call path has been set, the reserved information (call channel number, base station 2b number, (For example, the mobile station 3 number), and the call continuation acceptance signal 120 is transmitted to the mobile station 3 using the control channel. Further, the base station 2b releases the silence state of the communication path with the exchange 1 as indicated by 122. At this time, the base station 2b and the exchange are in a state in which the communication path has already been determined (a communication status), so that there is no exchange of control information. Upon receiving the call continuation acceptance signal 120, the mobile station 3 switches to the call channel and sets a call path between the mobile station 3 and the base station 2b by the second in-zone connection means, and as shown by 124. The base station 2b can be placed in a call state and the call can be continued with the telephone 4 through the exchange 1.
Although the communication with the mobile station 3 is disconnected at the base station 2a, the mobile station 3 may return to the communication zone. Therefore, the communication path between the base station 2a and the switching center 1 (see the communication line shown in FIG. 1). 1), the communication path by the base station connection means 1 is set,
As shown in (3), the mobile station 3 is kept in the silent state and the handover reservation state of the mobile station 3 is held. That is, there is no sound between the base station 2a and the exchange, but the call path is still set, and in the conference call state interrupted by the call between the telephone 4 and the mobile station 3 via the base station 2b. is there. When the mobile station 3 further moves away from the base station 2a and reaches “9 points”,
The base station 2a releases the reservation state and disconnects the communication path with the exchange 1 (the communication path by the first base station connection means) (12
8) Then, return to the normal state.

As described above, according to the first embodiment, the mobile station 3 does not start the handover operation until it reaches the handover point as in the conventional method, but the mobile station moves in advance. Since the communication path (the communication path by the second base station connecting means) is set in the preceding base station and the conference communication state is set up for the handover of the mobile station, the time required for the mobile station to switch the base station by the handover is shortened. You can
Call drops are reduced and call quality is improved. Also,
The success rate of handover can be improved by shortening the time. Further, although the reservation completion signals 114 and 116 are transmitted to the mobile station in the first embodiment, the reservation completion signal indicates that the call path at the destination base station is secured for the mobile station. It is for notifying that there is. Therefore, even if the reservation completion signal is not transmitted, the same operation and effect as described above can be obtained during the handover operation.
Further, although it has been described that the movement determining means 30 is arranged in the mobile station and the handover operation is started in the mobile station, the movement determining means 30 is arranged in the base station and the base station has the same function. However, the same action and effect as described above can be obtained.

Embodiment 2. In the above-mentioned Embodiment 1,
In the base station 2b, the movement predicting means 40 detects the strength of the radio wave of the mobile station 3 and activates the handover reservation operation. However, the movement predicting means 40 is arranged in the mobile station 3 so that the mobile station 3 operates as follows. A method may be used in which the handover reservation operation is activated when the HO reservation signal to be transmitted is received by the base station 2b. FIG. 7 is a sequence diagram for explaining the second embodiment. That is, the mobile station 3 that has reached the “seven points” switches from the call channel to the control channel for a short time by the movement predicting means 40 and transmits the HO reservation signal 130 to the base station 2b. The transmitted HO reservation signal is received by a plurality of adjacent base stations. Among the plurality of base stations, the base station 2b that has received the HO reservation signal with a strength equal to or higher than a certain threshold is a mobile station. Three
The handover reservation operation of is activated. The handover reservation operation for the switching center 1 is the same as that in the first embodiment, and therefore its explanation is omitted. This embodiment also has the same effects as the above-mentioned embodiments. The reservation completion signal 1 in FIG.
The sequence of 14, 116 and subsequent Xs is the same as that of the first embodiment, and therefore, the illustration and description thereof are omitted.

Embodiment 3. As described above, in the second embodiment,
Although the HO reservation signal transmitted from the mobile station 3 is received by the base station 2b to activate the handover reservation operation, the handover reservation operation may be activated by receiving the HO reservation signal in the base station 2a. The same effect as the above-mentioned form is obtained. FIG. 8 is a sequence diagram for explaining the third embodiment. That is, the mobile station 3 receives the HO at "7 points".
The reservation signal 140 is transmitted through the communication channel, and the HO reservation signal 140 is transmitted to the exchange 1 through the base station 2a as indicated by 142. When the mobile station 3 is connected to the base station 2a,
Sending the HO reservation signal 140 on the call channel is
This is because the mobile station 3 and the base station 2a are currently in a call using the call channel. The exchange 1 notifies the adjacent base station 2b of the base station 2a that there is a HO reservation signal from the adjacent base station 2a, as indicated by 144. Data of an adjacent base station (not shown) is recorded in the exchange station. By referring to the data of the base station, it is possible to refer to the data of the base station to see whether the communication zones formed by the base stations are adjacent to each other. It can be judged by The base station 2b activates the handover reservation operation of the mobile station 3 by the HO reservation signal 144. FIG.
The reservation completion signals 114, 116 and subsequent X sequences are the same as those in the first embodiment.

Embodiment 4 In the above third embodiment,
Although the base station 2a decides to notify the exchange station 1 and the base station 2b of the HO reservation signal by receiving the HO reservation signal of the mobile station 3, the base station 2a is provided with the movement prediction means 40 and The station 2a may notify the HO reservation signal based on the strength of the radio wave of the mobile station 3, and the same effect as that of the above-described embodiment can be obtained. FIG. 9 is a sequence diagram for explaining the fourth embodiment. That is, the base station 2a detects the strength of the radio wave of the mobile station 3 at "seven points" and transmits the HO reservation signal 150. Subsequent sequences Y and X are the same as those in the third embodiment.

Embodiment 5 In the above-described first to fourth embodiments, when the mobile station 3 reaches the “seven points”, the handover reservation operation is activated by issuing an interrupt or a HO reservation signal. May be a method in which the adjacent base station activates the handover reservation operation according to an instruction from the exchange when the call starts, and the same effect as that of the above-described embodiment is obtained. FIG. 10 is a sequence diagram for explaining the fifth embodiment. That is,
When the mobile station 3 starts a call with the telephone 4 through the base station 2a and the exchange 1, the call path is opened (212) between the mobile station 3 and the telephone 4, and at the same time, the aforementioned adjacent base station in the exchange 1 is provided. The base station 2b that is adjacent to the base station 2a is specified from the data, and the HO reservation signal 220 is notified to the specified base station 2b. In response to the HO reservation signal 220, the base station 2b makes an interrupt call 110 to activate the handover reservation operation of the mobile station 3, but the sequence X after that is the same as in the first embodiment. According to this embodiment, since the mobile station 3 makes an interrupt call at the time of starting a call, the same effect as that of the above-mentioned embodiments can be obtained without using the movement predicting means.

Embodiment 6 FIG. In the above third to fifth embodiments, the switching center 1 notifies the base station 2b of the HO reservation signal so that the base station 2b transmits an interrupt call to activate the handover reservation operation of the mobile station 3. However, the exchange 1 does not send the HO reservation signal to the base station 2b but sends an interrupt incoming signal to instruct the base station 2b to move to the handover reservation operation of the mobile station 3. However, the same effects as those of the above-described embodiment can be obtained. The interruption incoming signal is a signal notifying that an interruption of the communication path has occurred. In FIGS. 8, 9 and 10, instead of the HO reservation signal of sequence Y in the sequence diagrams and the interruption transmission, the interruption reception signal is transmitted from the exchange 1 to the base station 2b and the mobile station is transmitted to the base station 2b. Three
Make a handover reservation for. That is, the interrupt transmission operation of the base station 2b is omitted. Further, the exchange 1 opens a call path to the base station 2b and keeps the mobile station 3 and the telephone 4 in a conference call state. The sequence X after the reservation completion signals 114 and 116 are the same as those in the third, fourth, and fifth embodiments.

Embodiment 7 In the above-described first to sixth embodiments, the exchange 1 processes the conference call state of the mobile station 3, the telephone set 4, and the base station 2b. However, as shown in FIG. The relay device 10 located between the base station 2a and the base station 2a, 2b may perform a conference call state process for three parties and a handover reservation operation process. The relay device 10 manages base stations related to adjacent base stations. Since the relay device 10 shares the function of the switching center 1, it also has the effect of reducing the load on the switching center 1.

Embodiment 8 FIG. In the above-mentioned Embodiment 7,
Although the relay device 10 is supposed to perform the process of the handover reservation operation, as shown in FIG. 12, even if the base station 2a performs the function of controlling the adjacent base station and processes the operation of the handover reservation, The same effect as the embodiment is obtained.

[0034]

As described above, according to the mobile communication system of the present invention, the movement of a mobile station is predicted and a communication path is set in advance with an adjacent base station to establish a conference call state. Therefore, the time at the time of handover can be shortened. In addition, the success rate of the handover operation can be increased.

Further, according to the present invention, a handover reservation for connecting the second base station in advance can be made without imposing a load on the relay means.

Further, according to the present invention, the present invention can be implemented by the main operation of the relay means that grasps the data of the base station and the mobile station.

Further, according to the present invention, the handover reservation can be made without using the movement predicting means, and the time at the time of handover can be shortened.

Further, according to the present invention, it is possible to set the communication path by the second base station connecting means without imposing a load on the exchange.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a mobile communication system of the present invention.

FIG. 2 is a diagram showing a communication zone formed by a base station of the mobile communication system of the present invention.

FIG. 3 is a sequence diagram for explaining the first embodiment of the present invention.

FIG. 4 is a diagram showing a format of an interrupt transmission signal used in the embodiment of the present invention.

FIG. 5 is a diagram showing a format of an interrupt transmission signal used in the embodiment of the present invention.

FIG. 6 is a diagram of a table showing the correspondence between base stations and mobile stations managed by a switching center in the embodiment of the present invention.

FIG. 7 is a sequence diagram for explaining the second embodiment of the present invention.

FIG. 8 is a sequence diagram for explaining the third embodiment of the present invention.

FIG. 9 is a sequence diagram for explaining the fourth embodiment of the present invention.

FIG. 10 is a sequence diagram for explaining the fifth embodiment of the present invention.

FIG. 11 is a sequence diagram for explaining the seventh embodiment of the present invention.

FIG. 12 is a sequence diagram for explaining an eighth embodiment of the present invention.

FIG. 13 is a schematic diagram showing a conventional mobile communication system.

FIG. 14 is a diagram showing a communication zone formed by a base station of a conventional mobile communication system.

FIG. 15 is a diagram showing a conventional handover sequence.

FIG. 16 is a diagram showing a format of a signal on a conventional manufacturing channel.

FIG. 17 is a diagram showing a conventional signal flow.

[Explanation of symbols]

1 switching stations, 2a, 2b, 2c base stations, 3 mobile stations,
4 Telephones, 5a, 5b, 5c, 5d Wired lines, 6
a, 6b, 6c communication zone, 7 HO reservation number (interruption origination) generation point, 8 handover point, 9 communication limit point, 11 first zone connection means, 12 first base station connection means, 13 first Communication means, 21 second zone connection means, 22 second base station connection means, 23 second
Communication means, 30 movement determination means, 40 movement prediction means, 100 relay means.

Claims (13)

[Claims] 1. A mobile station that moves and wirelessly communicates with a communication partner, a first base station that forms a first communication zone and is capable of wirelessly communicating with the mobile station, and the first communication zone. A second base station that forms an adjacent second communication zone and is capable of wirelessly communicating with a mobile station; and between the mobile station and a communication partner via at least one of the first and second base stations. A mobile communication system having a relay means for relaying communication, the first call passing through the first base station as the mobile station moves from the first communication zone to the second communication zone. In a mobile communication system for continuing communication by switching a path to a second communication path via the second base station, the first base station and a mobile station located in the first communication zone A first intra-zone connection means for connecting the Via first base station connecting means for connecting the connecting means, the relay means and the first base station connected by the first in-zone connecting means and the first base station connecting means. First communication means for setting a first communication path to communicate the mobile station with a communication partner, and movement determination means for determining the movement of the mobile station from the first communication zone to the second communication zone. A second base station and a mobile station located in the second communication zone as the mobile station moves from the first communication zone to the second communication zone determined by the movement determining means; Connecting the second base station and the relay means prior to connecting the second base station and the mobile station by the second intra-zone connecting means connecting the second base station and the mobile station. Second base station connecting means, and the second intra-zone connecting means Second communication means for setting a second communication path through the relay means connected by the second base station connection means and the second base station to communicate the mobile station with the communication partner. A mobile communication system comprising: 2. The second base station connecting means comprises the second base station connecting means.
The mobile communication system according to claim 1, wherein the mobile communication system is activated by the base station. 3. The mobile communication system according to claim 1, wherein the second base station connection means is activated by the relay means. 4. The mobile communication system further comprises movement predicting means for predicting movement of the mobile station from the first communication zone to the second communication zone, and the second base station connecting means. The mobile communication system according to any one of claims 1 to 3, wherein the second base station and the relay means are connected according to the prediction of the movement prediction means. 5. The second base station connection means connects the second base station and the relay means immediately after the communication between the mobile station and the communication partner is started.
The mobile communication system according to any one of 1 to 3. 6. The mobile communication system according to claim 4, wherein the movement predicting means is arranged in the second base station. 7. The mobile communication system according to claim 4, wherein the movement predicting means is arranged in the mobile station. 8. The mobile communication system according to claim 4, wherein the movement predicting means is arranged in the first base station. 9. The movement predicting means notifies the second base station connecting means by outputting a prediction notification signal for notifying a movement prediction.
The mobile communication system according to any one of 6, 7, and 8. 10. The relay means holds base station information for storing information on the first and second base stations respectively forming the first and second communication zones, and the relay means comprises:
10. The mobile communication system according to claim 9, wherein the prediction notification signal is input, the second base station is determined with reference to the base station information, and the handover reservation signal is transferred. 11. In the mobile communication system, the relay means is arranged in an exchange station which is connected to the first and second base stations and is capable of communicating with the communication partner, and the second base station connection means. The mobile communication system according to any one of claims 1 to 10, wherein the switching center and the second base station are connected to each other. 12. In the mobile communication system, the relay means is arranged in a relay device connected to the first and second base stations and an exchange station capable of communicating with the communication partner, and the second means is provided.
11. The mobile communication system according to any one of claims 1 to 10, wherein the base station connecting means connects the relay device and the second base station. 13. The mobile communication system according to claim 1, wherein the relay means is arranged in the first base station, and the second base station connecting means is provided in the first base station and the second base station. The mobile communication system according to any one of claims 1 to 10, characterized in that and are connected to each other.