JPH04373330A - Movile communcation system - Google Patents

Abstract

PURPOSE:To make traffic proper by performing access after a mobile station confirms whether the station is in an area allowing existence or not, preventing useless signals from being transmitted from the mobile station, and preventing the over load of a base station processor. CONSTITUTION:In a mobile communication system composed of plural service areas 12-1 and 12-2, a base station 11-1 alarms a base station identification number BS(A) showing the area 12-1, and a base station notifies a base station identification number BS(B) showing the area 12-2. For example, assuming that a mobile station 13 stores the BS(A) as the area enabling the reception of service, during standby, the mobile station 13 receives the base station identification number periodically, for example, and compares it with the stored identification number. When they are coincident, the system can be accessed and when they are not coincident, however, no access is performed. Namely, when the received base station identification number is BS(A) in this case, access is performed, and when moving to the other zone, however, neither position registration nor call originating signal transmission is executed.

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 in which a service area is defined for each mobile station and the mobile station can access the system only when it is within the service area.

0002

2. Description of the Related Art Conventionally, mobile communication systems such as the car telephone system have generally provided nationwide service, and the service area has not generally been restricted. In other words, by registering the location of a mobile station every time it moves, the network can always know the mobile station's location, and it can connect the line from the caller to the base station closest to the mobile station. This is because there was no need to limit it. However, with the radio paging method, it is difficult to provide nationwide service, and the service area is limited to a certain area. This is because in the radio paging method, the mobile station only receives data and does not have a transmitting function, so automatic location registration cannot be performed, and the system cannot know where the mobile station is, so there is no means of connection. Therefore, each mobile station is given an identification number unique to each region, and calls can only be made in the region determined by this number.

0003

[Problems to be Solved by the Invention] As mentioned above, in conventional mobile communication systems, service areas have not been actively limited. This was partly because it was thought that limiting the service area would lead to a decline in service quality, but there were no particular technical difficulties. Therefore, especially in areas where there are a large number of subscribers, it may be difficult to establish a call connection, especially during times when traffic is concentrated. This situation is particularly likely to occur in systems where the wireless zone has become very small as the number of subscribers increases. On the other hand, as a large number of small wireless zones become available, mobile stations do not necessarily need to make calls in all zones, but only need to be able to make calls in specific zones, such as homes, offices, stations, department stores, etc. The number of subscribers will also increase. However, since the conventional method takes into account services in all zones, it is necessary for the mobile station to register its location every time it crosses a zone, and the sudden increase in location registration traffic overloads the base station's processing unit. The disadvantage was that it became difficult to connect.

[0004] An object of the present invention is to realize a mobile communication system in which a mobile station can receive service only in a specific area.

[0005]

[Means for Solving the Problems] In the present invention, the base station broadcasts its own identification number, and the mobile station stores in advance the base station identification number that allows connection, and stores the broadcasted base station identification number and the mobile station. The feature is that only the areas that match the base station identification numbers in the base station identification numbers are set as service areas.

[0006]

[Operation] In the present invention, since the mobile station compares the base station identification number (or wireless zone number) stored in the mobile station with the base station identification number received from the base station to determine whether or not it is in the service area, It is possible to stop the transmission of unnecessary signals in other areas, preventing unnecessary congestion and reducing the load on the base station processing device.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing the features of the present invention. 11-
1, 11-2 are base stations, 12-1 is a service area of base station 11-1, 12-2 is an area of base station 11-2, 1
3 is a mobile station (PS). Base station 11-1 is area 1
The base station 11-2 broadcasts the base station identification number BS(A) indicating that the base station 11-2 is the base station 11-1, and the base station 11-2 similarly broadcasts the identification number BS(B). For example, it is assumed that the mobile station 13 stores BS(A) as a service area where it can receive services. Then, while on standby, the mobile station 13 periodically receives the base station identification number, compares it with the stored identification number, and if it matches, it can access the system as usual.
If the base station identification number does not match, it will not access, so in the above example, if the received base station identification number is BS (A), it will access, but if it moves to another zone, it will not register its location and will not send a calling signal. do not.

FIG. 2 shows an example of the structure of a control signal transmitted from a base station. 21 is a preamble, 22 is a synchronization word for frame synchronization, 23 is a base station identification number part, and 24 is a part representing the signal type. For example, if it is an incoming channel, this control signal distinguishes whether it is a broadcast signal or an incoming signal. This is the signal section for Reference numeral 25 represents a control information section representing specific control information, and reference numeral 26 represents a check bit (CRC) for error control. Since the base station periodically transmits this signal, the mobile station receives this signal, detects the base station identification number part 23, and checks it with the stored data. There are various possible control signals for broadcasting the base station identification number, but when the mobile station performs intermittent reception, it is preferable to broadcast the base station identification number on an incoming (standby) channel.

FIG. 3 shows the operating procedure of a mobile station when the present invention is applied to location registration. S1 is a step of switching to a control channel, S2 is a step of receiving a control signal from a base station,
S3 is a step of comparing and collating the received base station identification number with the stored one; S4 is a step of transmitting a location registration signal when the received base station identification number and the stored one match;
S5 is a step of switching to a different reception control channel when a control signal cannot be detected or the received base station identification number does not match the stored one, and S6 is a step of completing location registration and entering a standby state. It is a process that As shown in S3, in the present invention, the received base station identification number and the stored base station identification number are compared and access is possible only if they match. If they do not match, the phone will not enter the standby state and will not be able to make a call.

0010

[Effects of the Invention] According to the present invention, the mobile station accesses the area after confirming whether or not it is in the permitted area.
There is no need to transmit unnecessary signals outside the area, and the load on the base station can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram showing the features of the present invention.

FIG. 2 is a configuration example of a control signal from a base station used in the present invention.

FIG. 3 shows a mobile station location registration procedure when the present invention is applied.

[Explanation of symbols]

23 Base station identification number 24 Signal type 25 Control information section

Claims (1)

[Claims] Claim 1: In a mobile communication system including a plurality of base stations and a plurality of mobile stations, the base station broadcasts its own identification number, and the mobile station stores in advance a base station identification number that allows connection. A mobile communication system characterized in that the broadcast base station identification number and the stored base station identification number are checked, and when they match, the base station is accessed.