Telecommunications – Transmitter and receiver at separate stations
Patent
1993-04-13
1994-01-04
Dwyer, James L.
Telecommunications
Transmitter and receiver at separate stations
455 542, 379 60, H04Q 704, H04Q 900
Patent
active
052769062
ABSTRACT:
A digital radiotelephone system requiring a transfer of communication from a source base-site (200) in a source cell (100) to a selected one target base-site in a target cell. A source base-site (200) in the source cell (100) provides a first and a second threshold and measures the received signal strength of a mobile unit (225) communicating to the source base-site (200). When the measured signal strength at the source base-site (200) falls below the first threshold, the source base-site (200) initiates a handoff to target base-sites located by the mobile unit (225). The target base-sites measure the received signal strength of the mobile unit (225) and a target base-site is selected. The source base-site (200) is notified of the selected target base-site and hands off communication of the mobile unit (225) to the selected target base-site when the previously measured signal strength at the source base-site (200) falls below the second threshold.
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EIA/TIA, Project No. 2215, Dual-Mode Mobile Station-Base Station Compatibility Standard, Dec., 1989, pp. 2-75 to 2-79-describes the process a mobile undergoes to determine candidate target base-sites.
Dwyer James L.
Jenski Raymond
Keough Timothy H.
Motorola Inc.
Sonnentag Richard A.
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