Method for registering mobile station in mobile communication system

• US 5,212,822 A
• Filed: 01/02/1991
• Issued: 05/18/1993
• Est. Priority Date: 08/24/1989
• Status: Expired due to Term

• Current Assignee: NTT Mobile Communications Network Inc. (Nippon Telegraph and Telephone Corporation)
• Original Assignee: Nippon Telegraph and Telephone Corporation
• Inventors: Fukumine, Yoshinobu, Onoe, Seizo, Utano, Takanori, Umeda, Narumi
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): FAILE, ANDREW I
• Application Number:
  US07/623,670
• Time in Patent Office: 867 Days
• Field of Search: 455/33.1, 455/33.2, 455/33.4, 455/54.1, 455/56.1, 455/53.1, 455/34.1, 379/60
• US Class Current: 455/435.3
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 60/04 using triggered events
• CPC Class Codes: H04W 8/183 Processing at user equipment or user record carrier

Abstract

Respective location registration areas (A, B, C,) in a mobile communication network include a plurality of base station service areas (a₁ -a_n, b₁ -b_n, c₁ -c_n). By partially overlapping the respective location registration areas, each of the respective base station service areas, for instance, (b₂₃, c₂₃) belong to a plurality of location registration areas (B, C). The respective base station (b₂₃, c₂₃) transmits all the location registration codes (B, C) together with one designated primary location registration area code (B) to be selected by a mobile station. The mobile station begins communication after registering the designated area code. When, during communication, the mobile station moves beyond the location registration area boundary, no registration is updated so long as the mobile station stays within communication with a base station transmitting the designated registered area code. When the mobile station moves out of the base station area, the registration code is updated to a new location registration area. Accordingly, the number of location registration updates due to movement of the mobile station near the boundary of location registration areas is decreased in comparison with a conventional method.

Claims

1. A mobile communication system comprising:

a plurality of location registration areas each having a plurality of radio base stations associated therewith for the transmission of location registration area codes for storage in a mobile station wherein;

some of said radio base stations are associated with a plurality of location registration areas by partial overlap of said location registration areas,

each radio base station transmits all the registration area codes with which said each radio base station is associated together with the indication of one of said codes as a primary location registration area code,

the mobile station receives the location registration area codes, and compares said received codes with a previously stored location registration area code so that

when the previously stored area code in the mobile station coincides with none of the plurality of area codes transmitted by the base station, the registration of area code for the mobile station is updated to said primary location registration area code.

2. A mobile communication system according to claim 1, wherein the selection of said primary location registration area code is performed according to a position of said primary location registration area code in the plurality of location registration area codes.

3. A mobile communication system according to claim 1, wherein the selection of said primary location registration area code is performed according to the predetermined priority of a plurality of location registration areas.

4. A mobile communication system according to claim 1, wherein the primary area code is indicated by duplicate transmission of said primary area code by the base station.

6. A mobile station communication system according to claim 1, wherein the primary area code is selected based on the distance between said base station and the center of each of said plurality of location registration areas.

5. A method for registering a mobile station in a mobile communication system in which a service area covered by a plurality of radio base stations is divided into a plurality of location registration areas, location registration codes are assigned to said respective plurality of location registration areas, radio base stations are provided for transmitting said location registration codes to mobile stations for storage in said mobile stations, and the location registration code of the location registration area where said mobile station is located is stored in a home memory in a network, comprising the steps of:

dividing said service area into a plurality of location registration groups each of which includes at least a portion of a plurality of overlapping location registration areas,

assigning a plurality of location registration codes corresponding to said overlapping location registration areas to each radio base station located in each of said groups, and,

registering the location of each of said mobile stations, based upon a comparison of said plurality of location registration area codes with a location registration area code stored in each mobile station.