EP0439628A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method of registering position of mobile unit for mobile radio communication

Assignee: NTT Docomo Inc

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Filing: 1990-08-22

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Granted: —

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Expires: 2010-08-22

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Abstract

Abstract Each of the position registration areas (A, B, C) in mobile radio communication includes a plurality of base station service areas (a i , b i , c i ). Since these areas overlap each other, each base station service area (e.g. b₂₃, c₂₃) belongs to a plurality of position registration areas (B, C). Each of the base stations (b₂₃, c₂₃) transmits all the position registration area codes (B, C). An area code, e.g., code (B), is selected so that the position of the mobile unit is located at the center of the area selected. After registering the area code (B), the mobile unit starts communication. Even when the mobile unit moves beyond the boundary of the position registration area during the communication, updating of the area code is not made within the area of the registered area (B). When it moves outside the area (B), the code is updated, that is, the position of the mobile unit is registered so that this position is in the center of the area. Accordingly, the frequency of updating of position registration due to the movement of the mobile unit crossing the boundary of the position registration areas can be reduced much more than in the conventional systems.

Inventors

👤 Yoshinobu Fukumine
👤 Takanori Utano
👤 Narimi Umeda
👤 Seizo Onoe

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-10-23 22:36

CPC Classifications

H; H04; H04W; H04W60/00; H04W60/04; H04W48/00; H04W48/08; H04W8/00; H04W8/18; H04W8/183

Claims Analysis

Total Claims: 5

Claim 1

Independent Claim 216 words

A method for registering a mobile station in a mobile communication system in which each location registration area (A, B, C) in a mobile communication system contains a plurality of radio base stations and associated radio base station service areas (a i , b i , c i ), and a location registration area code transmitted by each radio base station is stored in a mobile station and a home momory coupled with the radio base stations, characterized in that, some radio base stations belong to a plurality of location registration areas by partial overlap of said location registration areas (A, B, C), each radio base station transmits all the registration area codes to which the radio base station belongs together with the indication of one location registration area code to be selected in a service area of said base station, the mobile station registers the indicated location registration area code, and when the area code registered in the mobile station coincides with none of the plurality of area codes transmitted by the base station, because of movement of the mobile station, the registration of area code for the mobile station is updated to a location registration area code designated by a base station which includes the location of said mobile station in its service area.

Claim 2

Dependent Claim 40 words

A method for registering a mobile station according to claim 1, wherein the indication by the base station of one location registration area code to be selected is performed according to arrangement order of a plurality of location registration areas.

Claim 3

Dependent Claim 27 words

A method for registering a mobile station according to claim 2, wherein the area code to be selected is located at a specific position in the arrangement.

Claim 4

Dependent Claim 31 words

A method for registering a mobile station according to claim 2, wherein the area code to be selected is indicated by duplicate transmission of said area code by the base station.

Claim 5

Independent Claim 205 words

A method for registering a mobile station in a mobile communication system in which a servce area covered by many radio base stations is divided into a plurality of location registration areas, location registration codes assigned to said respective plurality of location registration areas are informed by said radio base stations to mobile stations, said location registration codes informed to a mobile station by said radio base stations are compared with the location registration code stored in the mobile station, and based upon the comparison result the location registration code of the location registration area where said mobile station locates is stored in a home memory in a network side, characterized in that said service area is divided into a plurality of divided location registration area groups each of which includes a plurality of location registration areas so that each location registration area overlaps with each other, each radio base station located in overlapped location registration areas is assigned a plurality of location registration codes, and said mobile station, based upon comparison result of said plurality of location registration area codes informed by said radio base station with the location registration area code stored in the mobile station, performs location registration in said home memory.

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