Multiplex communications – Wide area network – Packet switching
Patent
1991-09-30
1995-08-08
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 951, 455 561, H04J 306
Patent
active
054405610
ABSTRACT:
In a cellular TDMA communication system, prior to the handoff of a mobile unit (225) from a serving base-site (200) to a target base-site, (205 or 210) , the target base-site (205 or 210) establishes frame synchronization with the serving base-site (200). In this effort, first, the serving base-site timing is determined. Next, a timing difference between the serving base-site timing and a target base-site timing is calculated. Thereafter, frame positions within the serving base-site TDMA traffic channels are identified as a function of the timing difference in order to establish frame synchronization. Armed with this information, target base-sites (205 and 210) can continuously monitor all serving base-site (200) traffic channels for respective RSSI values. Preserving this information in memory enables fast and accurate signal strength determinations upon handoff.
REFERENCES:
patent: 4696052 (1987-09-01), Breeden
patent: 4852090 (1989-07-01), Borth
patent: 5228029 (1993-07-01), Kotzin
"Introduction of pseudo-synchronization" Matra Communication, France ETSI GSM/WP2, Copenhage, Jun. 1989.
Hillman Val Jean F.
Motorola Inc.
Olms Douglas W.
Ton Dang
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