JP3487258B2 - Mobile communication system and call control method - Google Patents

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 having a plurality of paging areas and two-way communication between a mobile communication network and a mobile station and a paging control method.

[0002]

2. Description of the Related Art In mobile communication systems such as car phones and mobile phones, a system in which one mobile communication control station controls a plurality of paging areas is adopted in order to cope with an increase in the number of subscribers.

That is, in this mobile communication system, 1
When one mobile communication control station uses, for example, the entire prefecture area as a service area, the prefecture area is divided into a plurality of location registration areas, and a plurality of radio base stations using the same frequency are distributed and arranged in each location registration area. The mobile station registers its position with the mobile communication control station via the nearest radio base station. As a result, the mobile communication control station recognizes in which location registration area the mobile station is located.

When there is an incoming call, the mobile communication control station sends a call command to all the wireless base stations in the corresponding location registration area, and all the wireless base stations receive the incoming calls simultaneously in the location registration area. Call the destination mobile station. The mobile communication control station secures a communication line with the calling source via the radio base station that has received a response from the called mobile station, and enables communication. That is, the location registration area is a paging area.

[0005]

As described above, the mobile communication system has a plurality of calling areas for calling from a plurality of radio base stations all at once when there is an incoming call. The wireless identification number was transmitted wirelessly on the wireless control channel. Therefore, when the number of subscribers increases, the amount of signal for calling increases, which causes a problem of reducing the capacity of the radio control channel. Therefore, in the mobile communication system, it is necessary to limit the call signal amount to a certain level or less.

To address this problem, it is conceivable to reduce the paging area in order to reduce the amount of signals when the number of calls exceeds a certain level. However, if the paging area is reduced, the number of location registrations increases with the frequent movement of mobile stations, and this causes other problems such as an increase in the usage rate of radio control channels and an increase in the throughput of mobile communication control stations. Will occur.

An object of the present invention is to provide a mobile communication system and a paging control method capable of reducing paging signals on the radio control channel so as not to overwhelm the capacity of the radio control channel.

[0008]

In order to solve the above problems, the present invention has the following constitution. The gist of the invention described in claim 1 is a mobile communication system in which mobile station the mobile communication network has a plurality of paging area to perform two-way communication, the mobile communication network, when an incoming call Move
A mobile communication system is characterized in that the mobile communication system is provided with means for including a result of performing remainder calculation on the identification number unique to the mobile station in a call signal wirelessly transmitted to the station. The gist of the invention according to claim 2 is that in the mobile communication network, a wireless base station is
7. A means for receiving the call command signal from the mobile communication control station to execute the remainder calculation, and a means for including the result of the remainder calculation in a call signal wirelessly transmitted to the mobile station. 1 in the mobile communication system. According to a third aspect of the present invention, in the mobile communication network, a mobile communication control station executes the remainder calculation upon receiving an incoming call, and the remainder calculation is performed on a call command signal transmitted to a radio base station. The mobile communication system according to claim 1, further comprising: a means for including a result obtained. The gist of the invention according to claim 4 is that the mobile station performs a remainder operation on the identification number of its own station, and performs the remainder operation included in the result of the remainder operation and the wirelessly received call signal. Means to compare the results with
2. The mobile communication system according to claim 1, further comprising: means for generating a response signal to the radio base station of the mobile communication network including the identification number of the mobile station when the comparison result indicates a match. Exist in. The gist of the invention of claim 5 is
The wireless base station of the mobile communication network, means for comparing the identification number included in the response signal from the mobile station and the identification number used at the time of calling, and from the mobile station when the result of the comparison is a match. 5. The mobile communication system according to claim 4, further comprising means for transmitting the response signal of 1. to the mobile communication control station. A sixth aspect of the present invention is a call control method in a mobile communication system having a plurality of paging areas, in which a mobile communication network and a mobile station perform bidirectional communication. When there is, a call signal to be wirelessly transmitted to the mobile station is generated, including a result of performing a remainder calculation on the identification number unique to the mobile station.
Consists in calling control method in a mobile communication system, characterized by forming. The gist of the invention of claim 7 is
A radio base station of the mobile communication network receives the call command signal from the mobile communication control station, executes the remainder calculation, generates a call signal including a result of the remainder calculation, and wirelessly transmits the call signal to the mobile station. 7. Sending, characterized in that
It exists in the call control method in the mobile communication system described. The gist of the invention according to claim 8 is that the mobile communication control station of the mobile communication network executes the remainder calculation, and transmits a call command signal including the result of the remainder calculation to the radio base station, 7. The call control in the mobile communication system according to claim 6, wherein the station generates a call signal including a result of performing a remainder calculation included in the received call command signal, and wirelessly transmits the call signal to the mobile station. In the way. The gist of the invention according to claim 9 is that the mobile station compares the result of performing the remainder operation included in the radio-received call signal with the result of performing the remainder operation on the identification number of the own station, and the results match. 7. A call control method in a mobile communication system according to claim 6, wherein a response signal including an identification number of the mobile station is wirelessly transmitted to a radio base station of the mobile communication network. The gist of the invention according to claim 10 is that the radio base station of the mobile communication network compares the identification number included in the response signal from the mobile station with the identification number used at the time of calling, and when they match, the mobile base station moves. The call control method in a mobile communication system according to claim 9, wherein a response signal from the station is transmitted to the mobile communication control station, and when there is a mismatch, the response signal from the mobile station is discarded. According to the present invention, as a signal for calling a mobile station, a mobile station identification number subjected to a remainder calculation is used instead of using an identification number unique to the mobile station. it can. As a result, the number of subscribers that can be accommodated in the paging area, which is limited by the upper limit of the paging signal amount, can be increased. The amount can be reduced.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A mobile communication system according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 12.

FIG. 1 is a configuration block diagram of a mobile communication system according to an embodiment of the present invention. FIG. 2 is a diagram showing a mutual relationship among all areas, a paging area, a wireless zone, and a wireless base station in the mobile communication system according to the present embodiment.

First, as shown in FIG. 2, in the mobile communication system according to the present embodiment, the radio base station 400,
Reference numerals 410, 420, 430, and 440 respectively designate wireless zones 600 and 61 that specify a range in which communication control is possible.
It has 0, 620, 630 and 640. For example,
The range in which the communication control of the wireless base station 430 is possible is the wireless zone 630.

The paging area called by each radio base station with the same position code is composed of a plurality of radio zones. In the example of FIG. 1, areas 500 and 510 surrounded by a dotted line are the paging area. The paging area 500 is composed of wireless zones 600 and 610, and the paging area 510 is composed of wireless zones 620, 630 and 640.

Further, the entire area of this mobile communication system is composed of paging areas 500 and 510. In all areas, one home memory station 100 and the mobile communication control station 20 connected to this home memory station 100
0 and are arranged. Then, the mobile communication control station 200
Include wireless base stations 400, 410, 42 in all areas.
0, 430, 440, 450 are connected. In addition,
In the following description, the plurality of radio base stations 400 to 450 are
The wireless base station 400 is representative.

Next, referring to FIG. 1, the home memory station 10
A mobile communication control station 200 is connected to 0, a plurality of wireless base stations 400 to 450 are connected to the mobile communication control station 200, and a mobile station 300 is wirelessly connected to each wireless base station.

The home memory station 100 is provided with a subscriber information memory 101 for storing the position code of the area (that is, the paging area) in which the mobile station has registered the location and information about the subscriber. The home memory station 100 is well known to those skilled in the art and is not directly related to the present invention, and thus detailed description thereof will be omitted.

The mobile communication control station 200 comprises a simultaneous calling means 201, a response receiving means 202, a calling mobile station memory 203, and a position code allocation memory 204.

When the incoming call is received, the paging means 201 retrieves the position code of the paging area registered by the mobile station to be called from the subscriber information memory 101 in the home memory station 100, and reads out the corresponding paging area. A call command signal is sent to the radio base station 400. This call command signal includes, for example, as shown in FIG. 3, an incoming call identification number and a unique identification number of the mobile station to be called (hereinafter referred to as "mobile station identification number").

The response acceptance means 202 is a radio base station 400.
It is searched whether the mobile station identification number in the response signal from the mobile station 300 received via the call is stored in the calling mobile station memory 203. If it is stored, the connection operation is started. If it is not stored, Discard the response signal.

The calling mobile station memory 203 stores the calling mobile station identification number if there is a calling mobile station for each incoming call identification number, as shown in FIG. 4, for example. In the example of FIG. 4, the incoming call identification numbers are 1 to 128, and the incoming call identification number 3 is “vacant” because no mobile station is calling.

Further, in the position assignment code memory 204, as shown in FIG. 5, for example, the number of the radio base station 400 belonging to each position code is stored. The paging area corresponds to each position code, and which paging area each mobile station belongs to is stored in the subscriber information memory 101 in the home memory station 100 as described above.

Next, the radio base station 400 comprises a calling signal transmitting means 401, a response signal receiving means 402, and a calling mobile station memory 403 having the same structure as the calling mobile station memory 203 shown in FIG.

Receiving a call command from the mobile communication control station 200, the call signal transmitting means 401 performs a remainder operation on the mobile station identification number of the call target by a predetermined numerical value, and a call signal including the remainder calculation result. Is wirelessly transmitted on the wireless control channel.

That is, the call signal includes, as shown in FIG. 6, for example, the incoming call identification number and the remainder calculation result of the mobile station identification number of the call target. Such a calling signal is wirelessly transmitted all at once in the wireless zones of the respective wireless base stations within the simultaneous calling area.

When the mobile station identification number in the wirelessly received response signal is from the call target mobile station, the response signal receiving means 402 sends the response signal to the mobile communication control station 20.
Send to 0. The response signal includes the incoming call identification number and the mobile station identification number, as shown in FIG. 7, for example.

Further, the mobile station 300 comprises a response means 301 and a mobile station identification number memory 302 for storing the mobile station identification number of its own station.

The response means 301 calculates the remainder of the mobile station identification number in the call signal wirelessly received from the radio base station 400 (see FIG. 6) and the mobile station identification number stored in the mobile station identification number memory 302. Is compared with the result of performing a remainder calculation by a predetermined numerical value, and if they match, a response signal (see FIG. 7) is wirelessly transmitted to the wireless base station 400.

Next, the operation of the present embodiment will be described with reference to FIGS.
Will be described with reference to. 8 to 12 are time charts showing the operation of the present embodiment. FIG. 8 shows the operation of the mobile communication control station when receiving a call. FIG. 9 shows the operation of the wireless base station when receiving a call command. FIG. 10 shows the operation of the mobile station when receiving a call signal. FIG. 11 shows the operation of the radio base station when receiving a response signal. FIG. 12 shows the operation of the mobile communication control station when receiving a response signal.

In FIG. 8, the mobile communication control station 200 is
When there is an incoming call, the position code of the calling area registered by the calling mobile station 300 is used as the home memory station 1
00 is read from the subscriber information memory 101 (step S1), a free incoming call identification number in the calling mobile station memory 203 is searched, and the mobile station identification number to be called is stored (step S2).

Next, the mobile communication control station 200 determines the radio base station 40 corresponding to the position code read in step S1.
0 is read from the position code allocation memory 204 (step S3), and a call command signal (see FIG. 3) including the incoming call identification number and the mobile station identification number is sent to the read radio base station 400 (step S4).

At the same time, the mobile communication control station 200 starts a timer (step S5) and waits for a response from the radio base station 400 (step S6). When there is a response from the wireless base station 400 before the timer times out (step S7), the mobile communication control station 200 proceeds to the response acceptance process shown in FIG.

On the other hand, the timer expires (step S
If there is no response from the wireless base station 400 before 7), the mobile communication control station 200 deletes the mobile station identification number of the call target from the call mobile station memory 203 (step S).
8).

Next, referring to FIG. 9, the radio base station 400
When the call command signal (see FIG. 3) is received from the mobile communication control station 200, the mobile station identification number is extracted from the call command signal and stored in the mobile station memory 403 (step S9).

Next, the radio base station 400 executes a remainder calculation on the stored mobile station identification number of the call target (step S10), and a call signal including the remainder calculation result of the incoming call identification number and the call target mobile station identification number (see FIG. 6) is put on the wireless control channel and wirelessly transmitted to the wireless zone (step S11).

As a result, in the simultaneous calling area, calling signals are wirelessly transmitted all at once to the wireless zones of the respective wireless base stations.

Next, referring to FIG. 10, the mobile station 300
When the call signal is wirelessly received (step S12), a remainder calculation is performed on the mobile station identification number in the mobile station identification number memory 302 (step S13), and the calculation result and the remainder of the call target mobile station identification number in the call signal are obtained. The calculation result is compared (step S14).

When the two remainder calculation results do not match, the mobile station 300 returns to step S12 and prepares for wireless reception of the next call signal. On the other hand, when the two remainder calculation results match, a response signal including the mobile station identification number of the own station and the received incoming call identification number is wirelessly transmitted to the wireless base station 400 (step S15).

Next, referring to FIG. 11, a radio base station 400
Upon wirelessly receiving the response signal from the mobile station 300, the mobile station 300 receives the mobile station identification number in the response signal and the mobile station identification number corresponding to the incoming call identification number in the response signal stored in the calling mobile station memory 403. Are compared (step S1
6).

When both mobile station identification numbers match, the radio base station 400 sends a response signal including the mobile station identification number and the incoming call identification number to the mobile communication control station 200 (step S17). If the mobile station identification numbers do not match, the radio base station 400 does nothing and ends the process.

Next, referring to FIG. 12, the mobile communication control station 200 receiving the response signal detects the mobile station identification number in the response signal received from the radio base station 400 and the response signal stored in the calling mobile station memory 203. And the mobile station identification number corresponding to the incoming call identification number (step S1).
8).

When both mobile station identification numbers match, the mobile communication control station 200 executes the connection operation (step S19) and deletes the mobile station identification number of the call target from the call mobile station memory 203 (step S19). Step S
20). If the mobile station identification numbers do not match, the mobile communication control station 200 does nothing and ends the process.

In the above description, it is assumed that the radio base station 400 applies the remainder calculation to the mobile station identification number, but the mobile communication control station 200 performs the remainder operation in advance to call the radio base station with a command signal. May be included in. That is, the remainder calculation is performed on the mobile station identification number in the mobile communication network including the mobile communication control station and the radio base station.

As described above, in the mobile communication system according to the present embodiment, when the mobile communication network calls the mobile station 300, not the mobile station identification number but the result of the remainder calculation on the mobile station identification number is used. Therefore, the amount of call signals of the radio control channel can be reduced. As a result, the number of subscribers that can be called within a unit time increases, so that the general calling area becomes large and the number of location registrations can be reduced.

A description will be given below using specific numerical values. In a mobile communication system, the mobile station identification number may be larger than 10 digits. Therefore, for example, when the mobile station identification number is 12 digits, the number of digits becomes 5 when the remainder calculation is performed at 100000 and then transmitted to the wireless control channel, so that the data amount for the mobile station identification number is about 42. It can be reduced to%.

At this time, in the mobile communication system according to the present embodiment, the mobile station which is not the original calling target raises the response signal because the mobile station identification numbers of the last five digits match. The number of vehicles in this case will be investigated. Depending on the system, the paging area is designed so that the number of mobile stations in the paging area is several hundreds of thousands, depending on the amount of paging signals. Here, 100,0
Assume that it is 00 units.

On average, one mobile station accidentally coincides with the last five digits of the identification number and raises a response signal, but this does not occur every time at a particular radio base station, and such a response signal is generated. Is discarded due to a mismatch of mobile station identification numbers in the wireless base station, and therefore does not impose processing on the whole or part of the mobile communication network.

[0046]

As described above, according to the present invention,
Since the mobile station is called by using the mobile station identification number subjected to the remainder calculation, the call signal amount on the radio control channel can be reduced. As a result, the paging area becomes large and the number of location registrations can be reduced, so that the processing amount of the mobile communication control station can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of a mobile communication system according to an embodiment of the present invention.

FIG. 2 is a mutual relationship diagram of all areas, paging areas, wireless zones, and wireless base stations in the mobile communication system according to the embodiment of the present invention.

FIG. 3 is a configuration example of a call command signal.

FIG. 4 is a configuration example of a calling mobile station memory.

FIG. 5 is a configuration example of a position code allocation memory.

FIG. 6 is a configuration example of a calling signal.

FIG. 7 is a configuration example of a response signal.

FIG. 8 is a time chart showing the operation of the present embodiment (the operation of the mobile communication control station at the time of an incoming call).

FIG. 9 is a time chart showing the operation of the present embodiment (the operation of the wireless base station when receiving a call command).

FIG. 10 is a time chart showing the operation of the present embodiment (the operation of the mobile station when receiving a call signal).

FIG. 11 is a time chart showing the operation of the present embodiment (the operation of the wireless base station when receiving a response signal).

FIG. 12 is a time chart showing the operation of the present embodiment (the operation of the mobile communication control station when receiving a response signal).

[Explanation of symbols]

100 home memory station 200 mobile communication control station 300 mobile station 201 simultaneous call means 202 response acceptance means 203 call mobile station memory 204 position code allocation memory 300 mobile station 301 response means 302 mobile station identification number memory 401 call signal transmission means 402 response signal Reception means 403 Calling mobile station memory 403 400, 410, 420, 430, 440, 450 Radio base station 500, 510 Paging area 600, 610, 620, 630, 640 Radio zone

Claims (10)

(57) [Claims] 1. A mobile communication system having a plurality of paging areas for two-way communication between a mobile communication network and a mobile station, wherein the mobile communication network wirelessly communicates to the mobile station when an incoming call is received.
A mobile communication system comprising: means for including a result of performing a remainder operation on the identification number unique to the mobile station in a call signal to be transmitted . 2. In the mobile communication network, a radio base station receives the call command signal from the mobile communication control station and executes the remainder calculation, and the remainder calculation is performed on the call signal wirelessly transmitted to the mobile station. The mobile communication system according to claim 1, further comprising means for including a result of the application. 3. In the mobile communication network, a mobile communication control station includes means for executing the remainder calculation upon receiving an incoming call, and a result of performing the remainder calculation in a call command signal transmitted to a radio base station. The mobile communication system according to claim 1, further comprising: 4. The mobile station compares a means for performing a remainder operation on its own identification number with a result of the remainder operation and a result of the remainder operation included in a wirelessly received call signal. And a means for generating a response signal to the wireless base station of the mobile communication network including the identification number of the own station when the results of the comparison are coincident with each other. Mobile communication system. 5. The radio base station of the mobile communication network compares the identification number included in the response signal from the mobile station with the identification number used at the time of calling, and when the comparison result is the same. a response signal from the mobile station, characterized in that it comprises means for transmitting to the mobile communication control station 請
The mobile communication system according to claim 4 . 6. A paging control method in a mobile communication system having a plurality of paging areas, wherein a mobile communication network and a mobile station perform bidirectional communication, wherein the mobile communication network comprises:
A call for wirelessly transmitting to the mobile station, including a result of performing a remainder calculation on the identification number unique to the mobile station when an incoming call is received
Call control method in a mobile communication system and generating a by signal. 7. A radio base station of the mobile communication network receives a call command signal from a mobile communication control station, executes the remainder calculation, and generates a call signal including a result of the remainder calculation, 7. The call control method in a mobile communication system according to claim 6, wherein the call is transmitted wirelessly to the station. 8. The mobile communication control station of the mobile communication network executes the remainder calculation, transmits a call command signal including the result of the remainder calculation to a radio base station, and the radio base station receives the call command signal. 7. The call control method in a mobile communication system according to claim 6, wherein a call signal including a result of performing a remainder calculation included in the call command signal is generated and wirelessly transmitted to the mobile station. 9. The mobile station compares the result of performing the remainder operation included in the call signal received by radio with the result of performing the remainder operation on the identification number of the own station, and when they match, the mobile communication is performed. 7. The call control method in a mobile communication system according to claim 6, further comprising wirelessly transmitting a response signal including an identification number of the local station to a wireless base station of the network. 10. The radio base station of the mobile communication network compares the identification number included in the response signal from the mobile station with the identification number used at the time of calling, and when they match, the response signal from the mobile station. 10. The call control method in a mobile communication system according to claim 9, further comprising: transmitting a response signal from the mobile station to the mobile communication control station, and discarding the response signal from the mobile station when they do not match.