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BEACON PROFILING FOR RELOCATION REGISTRATION TO ADJACENT BASE STATIONS WITH SAME BEACON INFORMATION

IP.com Disclosure Number: IPCOM000007958D
Original Publication Date: 1997-Mar-01
Included in the Prior Art Database: 2002-May-08
Document File: 3 page(s) / 116K

Publishing Venue

Motorola

Related People

Ng See Woon: AUTHOR

Abstract

Base stations in an extensive two-way CT2 sys- tem typically have overlapping coverage areas. These overlapping coverage areas cause problems when portable communication units attempt to reg- ister for two-way calling while crossing from one coverage area to another. In such an overlapping coverage area, two different base stations may be transmitting a similar beacon signal. Under such circumstances, the portable communication unit may be receiving an incoming call from a first base station when effectively located in a second cover- age area of a second base station. Thus, the incom- ing call will not connect to the portable communica- tion unit.

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MOTOROLA Technical Developments

BEACON PROFILING FOR RELOCATION REGISTRATION TO ADJACENT BASE STATIONS WITH SAME BEACON INFORMATION

by Ng See Woon

BACKGROUND

  Base stations in an extensive two-way CT2 sys- tem typically have overlapping coverage areas. These overlapping coverage areas cause problems when portable communication units attempt to reg- ister for two-way calling while crossing from one coverage area to another. In such an overlapping coverage area, two different base stations may be transmitting a similar beacon signal. Under such circumstances, the portable communication unit may be receiving an incoming call from a first base station when effectively located in a second cover- age area of a second base station. Thus, the incom- ing call will not connect to the portable communica- tion unit.

  Proposed herein is a method to use signal strengths of beacon signals to profile the beacon signals for effective relocation registration to adja- cent base stations.

SOLUTION

When a handset moves away from a base sta- tion, signal strength of a beacon from the base sta-

tion, as detected by the handset, decreases. When the signal strength goes below a certain threshold, the handset is primed for relocation registration. When the signal strength goes above a relocation threshold, the handset re-registers.

  When Base B is installed close to Base A, an overlap of their coverage area is substantial. As such, a handset moving from Base A to Base B can

no longer detect a dip in signal strength and, there- fore, will not re-register to Base B.

This problem is overcome as follows.

  Figure 2 shows a signal profile of two beacon signals synchronized and received as two similar beacon signals by the handset in the overlap of the coverage area. During scanning, the handset detects the two similar beacon signals and therefore primes itself for relocation registration. However, the relo- cation registration which takes into consideration number of similar beacons is not sufficient to guar- antee relocation reg...