Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2006-05-30
2006-05-30
Gary, Erika A. (Department: 2681)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S067110, C455S101000, C375S299000
Reexamination Certificate
active
07054639
ABSTRACT:
The present invention provides a method and apparatus for determining the data transmit diversity mode of a base station. The present invention first estimates a first feedback weight of the mobile unit during a first slot. The first feedback weight has a first phase. Then, the present invention estimates a second feedback weight of the mobile unit during a second slot. The feedback weight has a second phase. A phase difference is obtained by comparing the first phase with the second phase. The present invention determines the applicability of closed loop transmit diversity mode according to the phase difference. Besides, if the feedback error rate is too high, the present invention commands the base station to tune off the closed loop transmit diversity for better performance.
REFERENCES:
patent: 6584161 (2003-06-01), Hottinen et al.
patent: 6839326 (2005-01-01), Pajukoski et al.
patent: 6892059 (2005-05-01), Kim et al.
patent: 2003/0003873 (2003-01-01), Raghothaman
Chen Sheng-Jie
Lin Che-Li
Bednarek Michael
BenQ Corporation
Gary Erika A.
Pillsbury Winthrop Shaw & Pittman LLP
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