JPH10294966A - Calling control system for mobile object communication - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce traffic for calling a mobile station from a base station without narrowing a position registration area by predicting the probability of the presence of the mobile station for the plural base stations inside the position registration area and calling the mobile station from one of the plural base stations based on the presence probability of the mobile station when a call is originated to the mobile station. SOLUTION: In a switchboard 1 to which the position of the mobile station 4 is registered, a call origination and termination condition management table for the mobile station 4 is prepared. In the call origination and termination condition management table, an item below the column of a registered call origination and termination base station name indicates a history for the mobile station 4 to the position registration area 2 and indicates the information of call origination and call termination responses when the mobile station 4 is registered to the position registration area 2 before this time. Then, call origination signals are sent out to the base station (base station 23, for instance) for which the call origination and termination frequency order of the call origination and termination condition management table is first and the base station 23 which receives the call termination signals calls the mobile station 4 by transmitting calling signals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a paging control system for mobile communication.

[0002]

2. Description of the Related Art Recently, mobile communication such as an automobile telephone and a portable telephone for performing wireless communication between a mobile station and a base station has been popularized. In this type of mobile communication, one base station forms one wireless zone, and when a mobile station exists in this wireless zone, the base station in the wireless zone and the mobile station perform wireless communication.

[0003] In a mobile communication network, a large number of such base stations are installed, a large number of wireless zones are set up, and a wide area is covered. An exchange is provided for each of the plurality of base stations, and each base station is connected to the exchange, and is connected to another communication line network (for example, a public telephone network) via the exchange.

[0004] By the way, if the location of the mobile station is unknown when there is a call from another telephone or the like to the mobile station, it is necessary to call the mobile station from all base stations of the mobile communication network. The station performs location registration with respect to the mobile communication network and calls only from all the base stations in the registered location registration area. By doing so, it is possible to reduce the number of base stations that call the mobile station and to reduce the traffic that calls the mobile station from the base station (hereinafter referred to as “incoming traffic”).

[0005] The location registration of a mobile station is performed by transmitting a location registration signal to a base station in a wireless zone where the mobile station is located. Then, the mobile station is registered in the location registration area to which the base station that has received the location registration signal belongs. Since one location registration area is formed by a plurality of wireless zones, even if the mobile station moves out of the wireless zone where the location registration was performed, if the mobile station is within the location registration area, it is necessary to perform location registration again. There is no.

As described above, paging of a mobile station is performed from all base stations in the location registration area where the mobile station is registered. That is, the paging area for calling the mobile station and the location registration area are the same.

FIG. 4 is a flowchart of a conventional paging control system for mobile communication.

First, when there is a call from another telephone or the like to the mobile station, a search is performed to find a location registration area in which the mobile station is registered (S-1). Then, an incoming call signal is transmitted to all base stations in the obtained location registration area (S-2). The base station that has received the incoming call signal calls the mobile station by transmitting the call signal.

[0009]

The mobile communication is expected to further develop in the future, and the number of subscribers is expected to increase. In such a case, incoming traffic increases, and the load on the switching center and the base station increases.

As a countermeasure for this, it is conceivable to reduce the load on the switching center and the base station by narrowing the paging area. As described above, in the conventional mobile communication network, the location registration area and the paging area are different. Since they are the same, when the calling area is narrowed, the location registration area is also narrowed.

If the location registration area is narrowed, it becomes necessary to frequently re-register the location when the mobile station moves, which causes a problem that the traffic for the location registration increases.

The present invention has been made in view of the above points, and has been made in consideration of the above-mentioned problems, and is intended to reduce the traffic (incoming traffic) for calling a mobile station from a base station without narrowing a location registration area. An object of the present invention is to provide a call control method.

[0013]

According to the present invention, in order to achieve the above object, a plurality of base stations constituting different radio zones exist in one location registration area, and one of the plurality of base stations is provided. Through one base station, in a paging control system of mobile communication in which the mobile station is recognized to be in the location registration area, predict the probability that the mobile station exists for a plurality of base stations in the location registration area, When there is a call to the mobile station, at least one of the plurality of base stations calls the mobile station based on the existence probability of the mobile station. It is preferable that the presence probability is detected based on the number of calls and the number of calls received by the mobile station through the base station in the location registration area in the past. Also, based on the number of calls and the number of responses received by the mobile station through the base station in the past in the location registration area, a base station having a high probability that the mobile station is present for a plurality of base stations in the location registration area is predicted. When a call is issued to the mobile station, the mobile station may be called in order from the base station having the highest probability of existence of the mobile station. In addition, it is preferable that there be a plurality of location registration areas where a plurality of base stations exist, and that the location registration be performed when the mobile station moves through the location registration area. The location registration area is
It is preferable that the mobile station is a unit for performing location registration. In addition, it is preferable to predict a base station having a large number of outgoing calls and incoming calls as a base station having a high mobile station existence probability.
When the mobile station makes a call or an incoming call response after the latest location registration, it is preferable to predict the base station that has received the outgoing or incoming call response as a base station with a high mobile station existence probability. In addition, it is preferable to perform prediction based on the base station corresponding to the location registration of the mobile station as a base station with a high mobile station existence probability. If the mobile station makes a call or call response a plurality of times after the latest location registration, even if the base station that received the latest call or call response is predicted as a base station with a high mobile station existence probability, Good.

Further, according to the present invention, a plurality of base stations constituting mutually different wireless zones exist in one location registration area, and the mobile station performs location registration via one of the plurality of base stations. In the paging control method of mobile communication that is recognized as being present in an area, when a call is made to a mobile station, if the mobile station performs a call or an incoming call response after the current location registration, the call is generated. Alternatively, the mobile station is called from the base station that has received the call response, and if there is no call response to the call, the mobile station is called from the base station corresponding to the location registration of the mobile station, and the call response to the call is made. When there is no call, the mobile station calls the mobile station in order from the base station which has made the most number of calls and incoming calls in the past. When the mobile station makes a call or call response a plurality of times after the latest location registration, it is preferable to call the mobile station from the base station that has received the latest call or call response.

According to the present invention, when a call is issued to a mobile station within the location registration area where the location of the mobile station has been registered, the mobile station is called in order from the base station having the highest probability of existence of the mobile station. .

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of a mobile communication network to which a paging control method of mobile communication according to the present invention is applied.

Base stations 21 to 24 and base stations 31 to 34
Is connected to the exchange 1 and is connected via the exchange 1 to another communication line network such as a public telephone network. Base stations 21 to
24 form one location registration area 2 and base stations 31 to
34 forms another location registration area 3.

Here, it is assumed that the mobile station 4 has moved to the location registration area 2 from another location registration area (not shown). The mobile station 4 transmits a location registration signal to a base station in the wireless zone where the mobile station 4 is currently located (here, the base station 24). The base station 24 receives the position registration signal and registers the position of the mobile station 4 with the exchange 1.

After the completion of the location registration, the mobile station 4
Can output a call signal and make a call to another telephone or the like if it is in the location registration area 2, and can transmit a call signal from a base station in the location registration area 2. Upon receipt, a call response signal can be transmitted to receive a call from another telephone or the like.

By the way, the exchange 1 that has registered the location of the mobile station 4 creates an incoming / outgoing call status management table for the mobile station 4, and FIG. 2 shows the format of the incoming / outgoing call status management table.

In the column of the mobile station name, the name of the mobile station whose position has been registered this time, that is, the mobile station 4 is set. The name of the base station that has received the position registration signal from the mobile station 4 and has registered the position with the exchange 1, that is, the base station 24 is set in the column of the name of the base station to be registered. In the column of the name of the base station for incoming and outgoing calls after registration, if the mobile station 4 has made a call or a call response after the location registration this time, the base station that has received the call signal or the call response signal is displayed. The name is set.
In FIG. 2, the “None” in the column of “Name of base station for incoming / outgoing call after registration” indicates a state in which mobile station 4 has not yet made a call or an incoming call response since the current location registration. ing. In the case where the mobile station 4 makes a call or a call response a plurality of times after the location registration, and a different base station receives a call signal or a call response signal in the plurality of times,
The name of the base station that has received the latest outgoing call signal or incoming call response signal is set in the column of outgoing / incoming call base station name after registration.

In the outgoing / incoming call status management table shown in FIG. 2, the items below the column of the incoming / outgoing call base station name after registration indicate the history of the mobile station 4 with respect to the location registration area 2, and the mobile station 4 2 shows information on a call origination and an incoming call response when registered in the location registration area 2.

That is, the base station 2 in the location registration area 2
For each of Nos. 1 to 24, the number of times the mobile station 4 transmitted a call signal (number of calls), the number of times the mobile station 4 transmitted a call response signal (number of calls response), the number of calls and the call response This is information such as the total number of calls (total number of incoming and outgoing calls) and the rank (order of incoming and outgoing calls) in descending order of the total number of incoming and outgoing calls.

In the example of FIG. 2, the base station 23 transmits
In this case, the number of incoming and outgoing calls is four, that is, the total number of outgoing and incoming calls is six, and the outgoing and incoming call frequency ranks first.

The processing of the paging control system for mobile communication according to the present invention using the incoming / outgoing call status management table shown in FIG. 2 will be described below.

FIG. 3 is a flow chart of an embodiment of a paging control system for mobile communication according to the present invention.

First, when there is a call from another telephone or the like to the mobile station 4, a search is performed to find a location registration area in which the mobile station 4 is registered (F-1). Here, the location registration area 2 corresponds. Then, the process proceeds with reference to the incoming / outgoing call status management table (the incoming / outgoing call status management table in FIG. 2) for the mobile station 4 in the obtained location registration area 2.

Next, it is determined whether the mobile station 4 has made a call or a call response after the location registration (F-2). That is, it is checked whether or not there is a base station name set in the column of incoming / outgoing call base station name after registration in the outgoing / incoming call status management table.

If there is a set base station name, an incoming call signal is transmitted to the base station (F-3),
The base station that has received the incoming call signal calls the mobile station 4 by transmitting the call signal. As a result, if there is an incoming call response from the mobile station 4, the process ends, and if there is no incoming call response, the process proceeds to step (F-6) (F-5).

In the example shown in FIG. 2, since there is no base station name set in the column of incoming / outgoing call base station name after registration, the process proceeds from step (F-2) to step (F-4). And
An incoming call signal is transmitted to the base station in the column of the registered base station name in the outgoing / incoming call status management table (F-4). That is,
An incoming call signal is transmitted to the base station 24, and the base station 24 that has received the incoming call signal calls the mobile station 4 by transmitting a paging signal. As a result, if there is an incoming call response from the mobile station 4, the process ends, and if there is no incoming call response, the process proceeds to step (F-6) (F-5).

Then, an incoming call signal is transmitted to the base station (the base station 23 in the example of FIG. 2) having the highest outgoing / incoming call frequency order in the outgoing / incoming call status management table (F-6). The base station 23 that has received the call calls the mobile station 4 by transmitting a call signal. As a result, if there is an incoming call response from the mobile station 4, the process ends, and if there is no incoming call response, the process proceeds to step (F-8) (F-7).

Subsequently, an incoming call signal is sent to the second base station (the base station 24 in the example of FIG. 2) having the second highest calling frequency order in the incoming / outgoing call status management table (F-8). This base station 24
In step (F-4), the transmission of the incoming call signal has already been completed. In such a case, the process proceeds to the next step without sending the incoming call signal again.

In step (F-8), if the transmission of the incoming call signal to the base station 24 having the second highest calling frequency is not completed, the incoming call signal is transmitted to the base station 24. Is transmitted, and the base station 24 that has received the incoming call signal calls the mobile station 4 by transmitting a call signal. As a result, if there is an incoming call response from the mobile station 4, the process ends, and
If there is no call response, the process proceeds to step (F-10) (F-10).
-9).

In step (F-10), the call signals are sent to all the base stations in the location registration area 24 which have not yet sent the call signals to the base station. Is transmitted, and the base station that has received the incoming call signal transmits a paging signal to call the mobile station 4. Here, the base stations 21 and 22 correspond to all the remaining base stations.

As described above, according to the present invention, a radio zone in which a mobile station exists is estimated at a high probability, and a mobile station is called in order from a base station in the radio zone with a high probability. Therefore, incoming traffic, that is, traffic for calling the mobile station from the base station can be reduced.

When the mobile station 4 moves from the previous location registration area 2 to the location registration area 3, the mobile station 4 in the location registration area 3 is moved in the same manner as the location registration area 2.
Is created, and the same processing is performed.

In this embodiment, the outgoing / incoming call frequency order is 2
In the case where there is no incoming call response even if the mobile station is called from the base station up to the same position, the mobile station is simultaneously called from all the remaining base stations in the location registration area, but the present invention is not limited to this. Alternatively, the number of base stations to be called may be changed according to the number of base stations in the location registration area. For example, if the number of base stations in the location registration area is 6 or more, the outgoing / incoming call frequency rank is fourth. Up to the call from the base station may be performed in order.

[0039]

As described above, according to the present invention,
Since the mobile station performs control so as to determine a base station to call based on the number of times of calling and receiving responses with a plurality of base stations in the location registration area to which the mobile station belongs, unnecessary calling is performed. , And incoming traffic can be reduced.

Further, according to the present invention, incoming traffic can be reduced without narrowing the paging area, so that it is not necessary to narrow the location registration area, and the mobile station can be used when moving. There is also an effect that it is possible to prevent an increase in traffic for location registration that frequently re-registers the location.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of a mobile communication network to which a paging control method of mobile communication according to the present invention is applied.

FIG. 2 shows a format of an incoming / outgoing call status management table.

FIG. 3 is a flowchart of one embodiment of a paging control method for mobile communication according to the present invention.

FIG. 4 is a flowchart of a conventional paging control method for mobile communication.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Switching center 2 Location registration area 21, 22, 23, 24 Base station 3 Location registration area 31, 32, 33, 34 Base station 4 Mobile station

Claims (11)

[Claims] 1. A plurality of base stations constituting different radio zones are present in one location registration area, and a mobile station is located in the location registration area via one of the plurality of base stations. In a mobile communication paging control system in which presence is recognized, the probability that the mobile station is present is predicted for a plurality of base stations in a location registration area, and when a call is made to the mobile station, the mobile station is called. A paging control method for mobile communication, wherein at least one of the plurality of base stations calls the mobile station based on the existence probability of the mobile station. 2. The mobile station according to claim 1, wherein the presence probability is detected based on the number of calls and the number of calls received by the mobile station in the location registration area in the past through the base station. Call control method for body communication. 3. A base having a high probability that the mobile station is present for a plurality of base stations in the location registration area, based on the number of calls and the number of responses received by the mobile station through the base station in the location registration area in the past. 3. The paging control of mobile communication according to claim 2, wherein a station is predicted, and when a call to the mobile station is made, the mobile station is called in order from a base station having a high probability of existence of the mobile station. method. 4. The mobile communication system according to claim 1, wherein there are a plurality of location registration areas where a plurality of base stations exist, and the location registration is performed when the mobile station moves through the location registration area. Call control method. 5. The paging control method for mobile communication according to claim 1, wherein the location registration area is a unit in which the mobile station performs location registration. 6. The paging control method of mobile communication according to claim 2, wherein the prediction is performed with a base station having a large number of call and call responses as a base station having a high existence probability of the mobile station. 7. When the mobile station performs a call or a call response after the latest location registration, the base station that has received the call or the call response is regarded as a base station having a high probability of existence of the mobile station. 3. The paging control method for mobile communication according to claim 2, wherein prediction is performed. 8. The paging control method for mobile communication according to claim 1, wherein the prediction is performed with a base station corresponding to the location registration of the mobile station as a base station having a high probability of existence of the mobile station. 9. When the mobile station makes a call or a call response a plurality of times after the latest location registration, the base station having received the latest call or the call response is a base station having a high probability of existence of the mobile station. 3. The paging control method for mobile communication according to claim 2, wherein the prediction is performed as a station. 10. A plurality of base stations constituting wireless zones different from each other in one location registration area, and a mobile station is located in the location registration area via one of the plurality of base stations. In the paging control method of mobile communication in which it is recognized that there is a call, if there is a call to the mobile station, if the mobile station makes a call or an incoming call response after the current location registration, Alternatively, the mobile station is called from the base station that has received the call response, and if there is no call response to the call, the mobile station is called from the base station corresponding to the location registration of the mobile station, and The mobile communication apparatus according to claim 1, wherein, when there is no incoming call response, the mobile station calls the mobile station in order from the base station which has made a number of previous calls and incoming call responses. Control method. 11. When the mobile station makes a call or a call response a plurality of times after the latest location registration, the mobile station is called from the base station that has received the latest call or the call response. 11. The paging control method for mobile communication according to claim 10.