Call handoff in a wireless telephone system

Details Call handoff in a wireless telephone system Call handoff in a wireless telephone system

H - Electricity

04

B

H04B 7/26 (2006.01) H04Q 7/22 (2006.01) H04Q 7/38 (2006.01) H04J 13/00 (2006.01) H04L 7/04 (2006.01)

Patent

CA 2105266

Signaling a mobile unit to transmit a synchronization pattern with voice information upon detecting from the signal strength of the wireless mobile unit by a base station that the mobile unit is approaching a minimum threshold. Where the voice information is initially being transmitted in a set of frequency hopping channels using spread spectrum transmission, the synchronization pattern is transmitted in one or more of the set of frequency hopping channels. In addition, the base station alerts a system controller to this fact, and the system controller requests that neighboring base stations monitor the set of frequency hopping channels being transmitted by the mobile unit. In order to synchronize to the mobile unit, the base stations utilize the synchronization pattern to come into synchronization with the mobile unit. The system controller transfers (handoff) the wireless mobile unit to the base station which is receiving the strongest signal strength.

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