Multiplex communications – Wide area network – Packet switching
Patent
1993-04-23
1994-02-08
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
379 60, 455 332, 455 542, 455 561, H04B 726
Patent
active
052854477
ABSTRACT:
A radiotelephone system verifies the carrier/interference (C/I) of a selected target channel before handoff. The subscriber (125), communicating to a source base-station (130) on a source channel, measures the received signal strength indication (RSSI) of a target channel at a target base-station (135) when the channel is keyed (transmitting) and dekeyed (not transmitting). The subscriber (125) transfers the measurements to a source base-station (130) which determines the ratio of the RSSI with the keyed channel (C) to the RSSI with the dekeyed channel (I). If the ratio is greater than a predetermined threshold, the source base-station (130) transfers the subscriber (125) from the source channel to the target channel at the target base-station (135).
REFERENCES:
patent: 4696027 (1987-09-01), Bonta
patent: 4704734 (1987-11-01), Menich et al.
patent: 4765753 (1988-08-01), Schmidt
patent: 4866710 (1989-09-01), Schaeffer
patent: 4881082 (1989-11-01), Graziano
patent: 4887265 (1989-12-01), Felix
patent: 5042082 (1991-08-01), Dahlin
Standards for Digital Mobile Telephone Systems, Research & Development Center for Radio Systems (RCR), Tokyo, Japan, version 3, Mar. 1991.
Jenski Raymond A.
Jung Min
Motorola Inc.
Olms Douglas W.
Sonnentag Richard A.
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