Closed-loop antenna diversity in a cellular radio...

Details Closed-loop antenna diversity in a cellular radio... Closed-loop antenna diversity in a cellular radio...

2007-10-30

2007-10-30

Anderson, Matthew (Department: 2618)

Telecommunications

Transmitter and receiver at separate stations

With control signal

C455S456500, C455S456600, C455S550100

Reexamination Certificate

active

10478032

ABSTRACT:
A method is provided for operating a cellular radio communication system with a base station, which may be switched between an operating state without closed-loop antenna diversity and an operating state with closed-loop antenna diversity, emitting a downlink signal with a weighting vector and a user station, for receiving the downlink signal and transmitting an uplink signal to the base station, delivering back-coupling information to the base station in the operating state with closed-loop antenna diversity, representing a determined weighting vector. On transition of the radio communication system into the operating state with closed-loop antenna diversity, the user station delivers back-coupling information, representing a weighting vector determined and known before the transition into the operating state with closed-loop antenna diversity, to the base station until a current weighting vector is determined by measurement, and then delivers the back-coupling information representing the current weighting vector.

REFERENCES:
patent: 6192256 (2001-02-01), Whinnett
patent: 6353638 (2002-03-01), Hottinen et al.
patent: 2002/0115473 (2002-08-01), Hwang et al.
patent: WO99/72464 (2000-11-01), None
patent: WO 01/28128 (2001-04-01), None
XP-002207980—Universal Mobile Telecommunications System (UMTS); Physical layer procedures (FDD) (3G TS 25.214 version 3.1.1 Release 1999).

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