JPH03247031A - Travelling object communication system - Google Patents

Abstract

PURPOSE:To prevent a time delay up to the execution of communication processing by giving the permission of starting communication of a control signal by a control radio channel (C-ch) and communication by a talking radio channel (S-ch) to only one station in base stations being component of a same communication zone and revising the base station giving the permission sequentially among the base stations. CONSTITUTION:The permission of communication of a control signal through a C-ch in same communication zones 4a-4j comprising plural base stations 2a-2c and the permission of starting the communication through an S-ch are given at most to only one station of the base stations 2a-2c in the communication zones 4a-4j. Then the base stations 2a-2c receiving the permission are changed sequentially among the base stations 2a-2c in the same communication zones 4a-4j. Thus, a useless position registration reply due to a difference between a base station identification code stored in the mobile station 6 and the base station identification code included in a signal on an outgoing channel of a C-ch and a non-response to a signal for the communication processing are prevented and the collision of C-ch channels caused because the plural base stations 2a-2c exist in the same communication zones 4a-4j is prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to mobile stations that move within a service area formed by each base station connected to a switching center and a communication zone formed by these base stations. This field relates to communication systems, particularly communication control between base stations and mobile stations.

[Conventional technology]

FIG. 10 is a block diagram showing a conventional mobile communication system disclosed in, for example, Japanese Unexamined Patent Publication No. 60-38940. In the figure, l is an exchange, 2a to 2j are base stations connected to this exchange 1, and 3 is an exchange 1 and base stations 2a to 2.
This is a wired line connecting to J. 4a to 4j are communication zones of the base stations 2a to 2j, and 5 is a crossover zone where these communication zones 4a to 4j intersect with each other. 6 is a mobile station that moves within the service area formed by the communication zones 4a to 4j.

The base stations 2a to 2j and the mobile station 6 also have a communication radio channel (hereinafter referred to as 5-ch) for telephone calls and a control radio channel (hereinafter referred to as C) for communication of communication control signals.
-ch), and these 5-ch and C-ch each consist of an uplink channel from the mobile station 6 to the base stations 2a to 2j, and a downlink channel from the base stations 2a to 2j to the mobile station 6. ing.

Next, the operation will be explained. Here, FIG. 11 shows the base stations 2a to 2j in the mobile communication system configured in this way.
2 is a timing diagram showing signals transmitted and received between the mobile station 6 and the mobile station 6. The operation will be explained below using location registration as an example.

When the location information of the mobile station 6 is required, the base stations 2a~
2j continuously sends out the location registration request signal a using the C-ch down channel. The mobile station 6 in a no-call state is waiting for a location registration request signal a from the base stations 2a to 2j, and is waiting for a location registration request signal a from the base stations 2a to 2j, and is waiting for a location registration request signal a from the base stations 2a to 2j.
When this location registration request signal a is received on the C-ch lower richer from the base station 2a of a, the location registration information a
If the base station identification code included in the mobile station 2a is different from the base station identification code stored by the mobile station 6 at the last location registration, the 5-ch to which the idle signal is being sent from the base station 2a is different. Detects downhill chaffle.

When the mobile station 6 detects the downlink channel signal of S-ch, which is being sent as an idle signal, the mobile station 6 transmits the corresponding 5-c signal.
The location registration signal C is transmitted on the uplink channel of h. The base station 2a sends the location information of the mobile station 6 based on the received location registration signal C to the switching center 1, and registers its location. In addition, the base station 2a prohibits signal transmission to the downlink channel corresponding to the uplink channel of 5-ch to which the location registration signal C was sent from the time the location registration signal C is synchronized until the reception thereof is completed. Send signal d. This prevents the location registration signal C from being sent from another mobile station 6 to the same uplink channel.

[Problem to be solved by the invention]

Since the conventional mobile communication system is configured as described above, when the communication zones 4a to 4j are configured with multiple base stations, the C channels of those base stations collide and communication becomes impossible. To avoid C-ch collisions such as C-
Even if there is a time difference in transmitting channels, since the base station identification code is different for each base station, the mobile station 6 may not respond to the location registration request signal from each base station in the communication zone even though it is in the same communication zone. In addition, the mobile station 6 that has stored the base station identification code of a base station in a certain communication zone waits for a communication processing signal that includes the base station identification code, and receives information from another base station in the same communication zone. However, there was a problem in that the base station did not respond to a signal for the same communication process that included the base station identification code of the base station, and it took a long time to execute the communication process.

The second invention was made to solve the above-mentioned problem, and it is possible to avoid Cch collision of each base station in the same communication zone, and it is possible for a mobile station to register the location of multiple base stations in the same communication zone. It is an object of the present invention to provide a mobile communication system that does not waste processing such as responding to a request signal and can prevent delays in time until execution of predetermined communication processing.

[Means for Solving the Problems] The mobile communication system according to the present invention starts control signal communication using C-ch and communication using 5-ch when a plurality of base stations constitute the same communication zone. Permission is granted to at most one base station among the base stations constituting the same communication zone, and the base station to which the permission is granted is sequentially changed among the base stations.

[For production]

Permission of communication of control signals by C-ch within the same communication zone composed of a plurality of base stations in this invention, 5-
By granting permission to start communication by channel to at most one base station within the communication zone, and sequentially changing the base station to which this permission is granted among each base station within the same communication zone. , to realize a mobile communication system that can prevent C-ch collisions that occur due to multiple base stations being in the same communication zone.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 is a switching center, 3 is a wire line, 4a to 4j are communication zones, 5 is a crossover zone, and 6 is a mobile station, which are the same as the conventional ones with the same reference numerals in FIG.
Otherwise, the detailed explanation will be omitted since it is a considerable part. Further, 7a to 7j are base station groups consisting of a plurality of base stations or a single base station, and the communication zones 4a to 4j are constituted by these base station groups 7a to 7j.

Further, FIG. 2 is a block diagram showing the configuration of the base station group 7a shown in FIG. 1. In the figure, 2a to 2c are three base stations forming a base station group 7a, each of which is connected to the switching center 1 via a wired line 3. 6a to 6d are mobile stations located within the communication zone 4a constituted by this base station group 7a, and correspond to the mobile stations shown at 6 in FIG.

Next, the operation will be explained. Here, FIG. 3 shows C-ch
This is a time chart showing an example of movement of permission to use 5-ch and permission to start a call using 5-ch.
-Ch usage permission and permission to start a call using S-ch (hereinafter referred to as C-ch, 5-ch allocation), 11 is communication between base stations 2a to 2C and mobile stations 6a to 6d, 12 is C-ch, This is a change in S-ch allocation, and 13 is a broken line indicating correspondence between base stations 2a to 2C and mobile stations 6a to 6d.

Here, in the base station group 7a, base stations 2a to 2
It is assumed that the priority order of C-ch and S-ch allocation of C is set highest for the base station 2a, followed by the base station 2b and then the base station 2C. Movement 12 of C-ch S-ch assignment is always C-ch.

Base stations 2a to 2C and mobile station 6 that have been assigned 5-ch
Base stations 2a to 2a that are not conducting communication 11 on 5-ch when communication 11 on 5-ch between a to 6d is started
2c with the highest priority. However, the movement of C-ch and S-ch assignments is
This is done only when there is no communication on the channel. Here, C-
ch, 5-ch assignment means communication of control signals between mobile stations 6a to 6d using C-ch, and calls from new mobile stations 6a to 6d or calls from new mobile stations. 6
When there is an incoming call to a to 6d, the base stations 2a to 2
This is to give permission to the base stations 2a to 2c to shift to the communication 11 on 5-ch between the base stations 2a to 2c and the mobile stations 6a to 6d.

Further, it is assumed that 5-ch is selected so that interference is unlikely to occur between base stations 2a to 20 and between base station groups 7a to 7j (the same applies hereinafter).

FIG. 4 is a flowchart showing the above control procedure.

That is, when a new call is detected in step STI, unused 5-ch in each base station 2a to 2c is detected in steps ST2 to ST4 according to the priority order. 5 unused at any of base stations 2a to 2C
-ch is detected, steps ST5 to ST
7, the base stations 2a to 2c receive C-ch and S-.
After performing channel assignment, base station 2c also uses unused S
-ch, all base stations 2a to 2C have C-ch,
The process ends without S-ch allocation (step 5T8). Further, if it is detected in steps ST9 and 5TIO that the call to which C-ch and 5-ch were not allocated has not been terminated, the process is carried out in step ST
2 and detects unused S-ch of base stations 2a to 2C again.

Next, location registration control will be explained. FIG. 5 is a time chart showing an example of the timing of location registration between the base stations 2a to 2C and the mobile station 6a, where 21a is a location registration request signal of the corresponding base station group 7a, and 21b is a location registration request of the adjacent base station group. A signal 22 is a location registration signal of the mobile station 6a.

As described above, C-ch and S-ch assignment is performed to at most one station among the base stations 2a to 2C forming the base station group 7a. One of the base stations 2a to 2C that has been assigned C-ch and S-ch sends a location registration request signal 21a to the mobile station 6a at a cycle of T2 using the downlink channel of C-ch. do.

In order to avoid C-ch collision in the crossover zone 5 in FIG. 1, the communication zones 4b, 4c, and 4d, which share the crossover zone 5 with the communication zone 4a, are located at different times as shown in FIG. A registration request signal 21b is sent.

Here, it is assumed that the mobile station 6a has newly entered the communication zone 4a of the base station group 7a at the time point Ta in FIG. Furthermore, the location registration request signal 21a includes a request signal A and a base station group identification signal B, of which the base station group identification signal B is common among the base stations 2a to 2C forming the base station group 7a. do.

The mobile station 6a that has received the location registration request signal 21a returns a location registration signal 22 in response to the location registration request signal 21a that it first received from time Ta. The location registration signal 22 includes a registration signal C1, a mobile station identification code, and a base station group identification code B. At this time, the mobile station 6a stores this base station group identification code B, and then sends a location registration request signal 2.
It is assumed that the location registration signal 22 is returned only when the base station group identification code B upon receiving 1a is different from the base station group identification code B when the registration signal 22b was previously returned.

FIG. 6 is a flowchart showing the control procedure of the mobile station 6a during this location registration. That is, when the mobile station 6a receives the location registration request signal 21a (step 5T1
1) Compare the base station identification code B in the location registration request signal 21a with the stored base station identification code B (step 5T12). As a result, if the two match, the process ends; if they do not match, the location registration signal 22 is sent out, the stored base station identification code B is updated (step 5T13), and the process ends. do.

Information based on this location registration information 22 is sent to the exchange 1 and location registration is performed. FIG. 7 shows these mobile stations 6a to 6d.
FIG. 2 is an explanatory diagram showing an example of a memory that stores location registration information. In the figure, 50a to 50d are mobile stations 6a to 6
Data 51a to 51d indicating where each of the mobile stations 68 to 6d is located in the communication zones 4a to 4j, respectively, is written corresponding to the addresses 50a to 50d. In this case, the data structure is not limited to the one described above, and other data structures suitable for the applicable model can be used.

FIG. 8 is a front view showing an example of a location display device that displays information on location registration.
~6d position information is obtained and the light emitting diodes 52a, 52b
, . . . lights up the corresponding one. For example, if the mobile station 6a is in the communication zone 4C, the light emitting diode 5
Turn on 2c.

As a result, location registration information can be transmitted to multiple communication zones 4a.
~4j is stable as long as they do not overlap, so mobile stations 6a~6
It becomes possible to display the summer accurately.

In this case, the display method is not limited to the one described above, but can be any suitable method for the applicable model, such as a cathode ray tube display or a liquid crystal display.

Next, control between the base station 2a and the mobile station 6a from call reception to call termination will be explained. FIG. 9 is a time chart showing an example of the sequence, in which 41 is an incoming call signal from the base station 2a to the mobile station 6a, 42 is an incoming call response signal from the mobile station 6b to the base station 2a, and 43 is an incoming call signal from the base station 2a to the base station 2a. 2 shows a call 2 communication on 5-ch between the station 2a and the mobile station 6a. 44 is a C-ch from the base station 2a to the switching center 1;
S-ch allocation release signal, 45 is a C-ch, 5-ch allocation signal from switching station l to base station 2b;
6 is a call confirmation signal from the base station 2a to the mobile station 6a.

47 is a call IIi acknowledgment signal from the mobile station 6a to the base station 2a, and 48 is the same (the call termination signal).

Here, each of the signals 41 to 48 is C-ch, S-c
h allocation release signal and C-ch, 5-ch allocation signal 45
All of the signals except for the base station group 7a include a base station group identification code unique to the base station group 7a, and the incoming call response signal 42, the call confirmation response signal 47, and the call termination signal 48 include mobile station identification codes.

The base station 2a sends an incoming paging signal 41 to the mobile station 6a.
-Send to channel. In response to this, the mobile station 6a sends the base station 2
By returning the incoming call response signal 42 to a, both parties receive 5-c.
Enter call 1 communication 43 on h.

During call 1 communication 430 on 5-ch, the base station 2a periodically sends a call confirmation signal 46 to the mobile station 6a, and the mobile station 6a returns a call confirmation response signal 47. It will be held at Finally, the mobile station 6a sends a call termination signal 4.
8 to the base station 2a, and transfers to transmission and reception of signals on the C-ch with the base station 2b.

C-ch, 5-ch allocation release signal 44 and C-c
The hS-ch allocation signal 45 is transmitted to the base station 2a for moving the C-ch and S-ch allocation from the base station 2a to 2b.
2b and exchange l.

As a result, by using the same base station identification code for all base stations in the same base station group, it is possible to obtain a mobile communication system in which the consistency of processing is less affected by the number of base stations in the base station group. can.

This sequence can be applied to all sequences in which a base station group identification code can be sent and received between a base station and a mobile station, in addition to the sequence from the incoming call to the mobile station to the end of the call described above. .

In the above embodiment, one base station group has one C-ch channel, but it is possible to have multiple C-ch channels and switch them one channel at a time or multiple channels at the same time. Also,
It is also possible to use the predetermined 5-ch as a substitute for the C-ch for exactly the same function.

Furthermore, when allocating C-ch and 5-ch, permission to use C-ch and permission to start a S-ch call are not given to the same base station, but are given to different base stations separately. In addition, the selection of base stations that grant these permissions is not limited to the preset priority order, but can also be selected according to random numbers, or the selection order can be rotated. In this case, the same effects as in the above embodiment can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, within the same communication zone made up of a plurality of base stations, permission for communication of control signals by C-ch and permission to start a call by 5-ch is granted to the communication concerned. The configuration is such that permission is given to at most one base station within a zone and the permission is sequentially changed among the base stations that make up the communication zone, so that the base station identification code stored in the mobile station and , due to the difference from the base station identification code included in the signal on the downlink channel of C-ch.
A mobile communication system that can prevent unnecessary location registration responses and non-responses to signals for communication processing, and that can prevent C-ch collisions that occur due to multiple base stations being in the same communication zone is obtained. It has the effect of

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a mobile communication system according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of a base station group, and FIG. 3 is a C-ch. 4 is a flowchart showing the processing procedure; FIG. 5 is a time chart showing signals sent and received during location registration; FIG. 6 is a flowchart showing the processing procedure. Fig. 7 is an explanatory diagram showing an example of a memory that stores location registration information, Fig. 8 is a front view showing an example of a location display device, and Fig. 9 is a diagram showing an example of a call between a base station and a mobile station, from incoming call to end of call. FIG. 10 is a block diagram showing a conventional mobile communication system, and FIG. 11 is a timing chart showing signals transmitted and received therein. 1 is a switching center, 2a to 2C are base stations, 4a to 4j are communication zones, 6.6a to 6d are mobile stations, and 7a to 7j are base station groups. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A communication zone formed by a switching center, a plurality of base stations connected to the switching center and each having a unique base station identification code, and a base station group consisting of a plurality of base stations or a single base station. a plurality of mobile stations moving within a service area provided by the mobile station, and each of the base station and the mobile station is configured with an uplink channel from the mobile station to the base station and a downlink channel from the base station to the mobile station. In a mobile communication system having a communication radio channel for telephone calls and a control radio channel for communication of communication control signals, when one communication zone is constituted by the base station group of a plurality of base stations, Among the base stations configuring the same communication zone, at most one base station per control radio channel is given permission to perform two-way communication using both upstream and downstream channels of the control radio channel, and a new call radio channel. a base station that grants permission to start two-way communication using both upstream and downstream channels of the control radio channel, and permission to start two-way communication using both channels of the control radio channel; , a mobile communication system characterized in that base stations constituting the same communication zone are sequentially changed.