Patent · US Active

Closed-loop antenna diversity in a cellular radio communication system

US7532866B2 · kind B2 · utility

0Cited by

2References

4Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Denis Brandes · Wendeburg, DE
Bernhard Raaf · Hersbruck, DE
Ralf Wiedmann · Birkenfeld, DE

Key dates

Filing date	Sep 25, 2007
Grant date	May 12, 2009
Priority date	—
Expiry date	Sep 25, 2027

Classification

Technology area (CPC H)Electricity
CPC primaryH04B7/0689
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.