Method and apparatus for locating mobile radio units in a multis

Telecommunications – Radiotelephone system – Zoned or cellular telephone system

Patent

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Details

455520, 455524, H04Q 700

Patent

active

057582831

ABSTRACT:
In a digitally trunked radio repeating system that includes several radio repeating transceiver sites linked by a multisite switch, a method for locating a mobile radio when two or more of the sites report having the mobile radio in their site area. When a site reports to the multisite switch that a mobile radio has newly entered the area for the site, the switch broadcasts communications from the mobile radio to two or more sites during a prescribed period of time. If no other site reports receiving a message from the mobile radio during the prescribed period, the radio is logged out of its former site and broadcasts to the radio are only made from the new site. If two or more sites report having the mobile radio in their areas within the prescribed period, a polling method is executed where each of the sites reporting messages from the mobile radio transmits in sequence a command for the mobile radio to respond. The site that first receives a response from the mobile radio to its polling message will log the mobile radio into its site. The mobile radio is then logged out of all other sites.

REFERENCES:
patent: 5212724 (1993-05-01), Nazarenko et al.
patent: 5247698 (1993-09-01), Sawyer et al.
patent: 5369681 (1994-11-01), Boudreau et al.
patent: 5392278 (1995-02-01), Teel et al.
patent: 5493696 (1996-02-01), Wolf
patent: 5561840 (1996-10-01), Alvesalo et al.
patent: 5564071 (1996-10-01), Liou et al.

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