Method and apparatus for inter-node handoff of a radio frequency

Details Method and apparatus for inter-node handoff of a radio frequency Method and apparatus for inter-node handoff of a radio frequency

1996-04-01

1998-06-02

Vo, Nguyen

Telecommunications

Carrier wave repeater or relay system

Portable or mobile repeater

455436, H04B 7185

Patent

active

057616086

ABSTRACT:
A method for a radio frequency communication unit (110) (CU) to hand off from a losing node (120) to a gaining node (122) estimates a gaining node uplink time (210) and a gaining node uplink frequency (212), which the gaining node uplink signal comprises. During handoff, the CU (110) ceases communications with the losing node (120) and immediately begins communications with the gaining node (122) using the uplink time and uplink frequency. A CU apparatus (300) uses a processor (302) for carrying out calculations necessary for estimating the gaining node uplink time and frequency. Information necessary for the calculations, such as a downlink signal time-of-arrival and Doppler offset, are collected by a CU receiver (306). The CU receiver (306) and a CU transmitter (304) are used to support downlink signals (142) and uplink signals (140), respectively, between the CU (110) and a node (120, 122).

REFERENCES:
patent: 5293423 (1994-03-01), Dahlin et al.
patent: 5408517 (1995-04-01), Nyhart et al.
patent: 5440562 (1995-08-01), Culter
patent: 5479409 (1995-12-01), Dupuy et al.
patent: 5561838 (1996-10-01), Chandos et al.

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