JPH05167512A - Mobile body communication method - Google Patents

Abstract

PURPOSE:To decide a call area dynamically and to increase the degree of freedom of the arrangement of base stations by detecting plural base stations BS with which a portable terminal equipment PS is able to communicate, informing the BS numbers to an exchange and registering their positions. CONSTITUTION:Since a PS 301 is resident in zones 201,202,204 being zones formed by BS-A101, BS-B102, BS-D104, the PS301 is able to communicate with three base stations. The PS301 recognizes each specific number of the three receptible BS. The PS301 sends position registration information to a BS having a highest electric field strength among the base stations to inform it to an exchange. The PS301 is moved and goes to the outside of the call area 401 and it is required to make position registration again. BS-C103, BS-E105, BS-F106 are detected as new communication available base stations, the BS numbers are informed to the exchange, the exchange revises the position registration information to set a call area 402 comprising zones C203, E205, F206.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small zone type cordless system for premises and a mobile communication method used in a public mobile communication system.

[0002]

2. Description of the Related Art Conventionally, this type of technology is a communication method for a large zone, such as a car phone or a mobile phone system, in which the entire Kanto region is defined as one zone. Since the position of (hereinafter referred to as PS) is managed in units of large zones and incoming calls are made within the large zones,
There was no need for detailed location registration in the large zone.

In addition, in a local cordless system or a system using a band higher than the quasi-microwave band, the small zone system is inevitably used, but the location registration is performed by the base station (hereinafter referred to as BS) in which the PS receives the best radio waves. (Referred to as “)”, and sends the location registration information to the BS.

FIG. 4 shows an example of a small zone type zone structure and conventional position registration. In FIG. 4, 1
BSs 0, 11, 12, and 13 are BS-A and BS-A, respectively.
BS-B, BS-C, and BS-D. 14, 15, 1
Reference numerals 6 and 17 denote BS-A10 and BS-B1 respectively.
1, BS-C12, BS-D13, 14 are zones covered by the radio wave reach distance r, which are zone A, zone B, zone C, and zone D, respectively. 20 is PS,
In the example of FIG. 4, PS20 is zone A14, zone B15.
And located in zone D17, BS-A10,
Radio waves of BS-B11 and BS-D13 can be received.

Next, the operations of location registration and calling in the conventional example will be described. PS20 is BS-A10 and BS-B1
1 and BS-D13, and the BS with the highest electric field strength is selected among them. In this case, BS-
Assuming that B11 has the strongest electric field strength, PS20 captures a wireless channel and sends position registration information to BS-B11. As a result, it is recognized by the system management unit (not shown) that the PS 20 is located in the zone B15 formed by the BS-B11. The management unit of the system includes a control device and an exchange that are connected to these BSs by wire and collectively manage the location registration information, but the description thereof is omitted because it is not necessary.

When the PS 20 receives an incoming call and makes a call, the BS-B 11 of which the location has been registered sends out call information and the PS 20 is called. Alternatively, when calling, there was a method of calling from all zones of the system.

As described above, the location registration and the call can be performed by the conventional method.

[0008]

However, according to the conventional method, when the PS moves to another zone after performing the location registration, if there is an incoming call while performing the location registration again in the destination zone. Since the incoming call is made in the zone before moving, the incoming PS cannot be received in the moved PS. Also,
In the method of making an incoming call to all zones of the system at the same time, there is a problem that the incoming traffic increases, and the processing capacity of the control device and the exchange is exceeded depending on the system scale.

The present invention solves the above conventional problems, and an object of the present invention is to provide an excellent mobile communication method capable of receiving an incoming call regardless of the movement of the PS.

[0010]

In order to achieve the above object, when a PS detects a plurality of BSs with which it can communicate, the PS notifies the exchanges of their BS numbers at the time of location registration, and the exchange supports the PS. The BS is registered as a calling area of the PS, and when there is an incoming call in the PS, a means for making an incoming call in the calling area is provided.

[0011]

By detecting a plurality of BSs with which the PS can communicate, notifying those BS numbers to the exchange and registering the location,
The exchange recognizes that the PS belongs to multiple zones, and the PS will be called from all of the zones when a call arrives. Therefore, even if the PS moves between zones within the multiple registered zones, You can receive calls without registering your location. Further, since the incoming call is performed only for the zone in which the location is registered, the traffic of the control information can be significantly reduced as compared with the incoming method for all zones.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of a cordless telephone system, in which 50 is an exchange, and a plurality of BSs, 61BS # 0 to 63B are provided in a wired communication section by telephone lines.
A plurality of (m + 1) BSs up to S # m are connected.
Reference numerals 71 and 72 denote PSs, which represent a plurality (n + 1) of PSs from PS # 0 to PS # n. PS # 0 to P
A wireless communication section is provided between S # n and BS # 0 to BS # m, and a wired communication section is provided between BS # 0 to BS # m and the exchange 50.

FIG. 2 shows a zone structure showing a location registration method and a calling area in the present invention. In FIG. 2, reference numerals 101 to 106 denote a plurality of BSs, respectively.
-A, BS-B, BS-C, BS-D, BS-E, BS
-F. The thin solid circles denoted by 201 to 206 are zones constituted by the radio wave propagation distances r from each of the plurality of BSs, and are zone A, zone B, zone C, zone D, zone E, and zone F, respectively. .. Reference numeral 301 indicates PS at a certain position, and reference numeral 302 indicates that the PS is at a position after the movement, which is designated as PS '. The area surrounded by the thick solid line 401 is the calling area for 301PS, and the area surrounded by the thick broken line 402 is 302P.
This is a calling area for S '.

Next, the operation will be described. (1) Position Registration Operation First, it is assumed that a certain PS 301 is in the position shown in FIG. PS301 is a zone 201 formed by BS-A101, BS-B102 and BS-D104.
Since we are in the zone, 202 zone, 204 zone,
The PS 301 can communicate with the three BSs.
The PS 301 sequentially receives the radio waves from these three BSs and detects the BS number included in the received radio waves, whereby the unique numbers of the three receivable BSs can be known. The PS 301 sends the location registration information to the BS having the highest electric field strength among those BSs. For example, the PS 301 sends location registration information to the BS-B 102, and the BS-B 102 notifies the exchange 50 of the received location registration information.

FIG. 3 shows a frame structure for notifying the location registration information. The frame is composed of a message identifier 82 and a detailed information section 83 except for the header section 81 which is an address section and the trailer section 84 which is an error detection section. In this case, the message identifier indicates location registration,
Detailed information is PS301 number / BS-A101 number / BS
-B102 number / BS-D104 number, that is, the calling area 401.

The PS 301 does not register a new position no matter where it moves within the 401 calling area. However, it is easy to re-register the location when the number of BSs that can communicate in the calling area has decreased due to the movement of the PS, or to re-register the location each time the BS that can communicate changes. Can handle. Which of the above three methods is used for the position registration timing may be set in advance in the exchange and the PS for each system as an initial constant. In the present embodiment, with the aim of reducing the traffic of the location registration information, a method of re-registering the location when leaving the calling area will be mainly described.

Next, if 301PS moves to the position of 302PS ', PS301 will go out of the calling area 401 until then, and it is necessary to re-register the position. 302PS 'is a newly available BS
As BS-C103, BS-E105, BS-F1
06 is detected, the three BS numbers are notified to the exchange in the same manner as described above, and the exchange updates the location registration information to set a new calling area 402 including zone C203, zone E205, and zone F206. (2) Incoming call (calling) method When there is an incoming call at PS'302 after moving, the exchange 50
Notifies the same incoming call information to three BSs, BS-C103, BS-E105, and BS-F106, and each BS receives zone C203, zone E205, and zone F2.
06, that is, the incoming call information is sent to the calling area 402.
The PS 301 is in communication with the BS that receives the incoming call information earliest. In this way, the PS can receive an incoming call wherever it moves within the calling area.

[0018]

As shown in the above embodiments, by dynamically setting a zone formed by a plurality of BSs that can communicate depending on the position of PS as a calling area, it is possible to move to any position within the calling area. Since it is not necessary to newly register the location, it is possible to reduce the traffic of the location registration information, and it is possible to reliably call the PS by arriving at the calling area.

Further, since the PS dynamically determines the calling area according to the position of the base station with which the communicable base station can communicate, it is possible to increase the degree of freedom in arranging the base stations.

[Brief description of drawings]

FIG. 1 is a block diagram of a cordless telephone system.

FIG. 2 is a diagram showing zones constituting a calling area in the present invention.

FIG. 3 is a diagram showing a format of location registration information according to the present invention.

FIG. 4 is a diagram showing a configuration of a conventional zone.

[Explanation of symbols]

 50 exchanges 61, 62, 63 base stations 71, 72 mobile terminals 201-206 zones 401, 402 calling areas

Claims (1)

[Claims] 1. A communication method for a mobile communication system comprising an exchange, a plurality of base stations accommodated in the exchange, and a mobile terminal for performing wireless communication with the base station, wherein the mobile terminal is , Comprising means for detecting a plurality of the base stations forming a communicable zone and means for notifying the exchange of the detected plurality of base station numbers and performing location registration, When communication with the calling area becomes impossible, the plurality of base station numbers that form a communicable zone are registered in the location, and the exchange is formed by all the base stations that have registered the location. When the mobile terminal has an incoming call, the base station forming the calling area sends the incoming call information to the mobile terminal. Body communication method.