Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2008-04-22
2008-04-22
Gary, Erika A. (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S436000, C455S443000, C455S446000, C455S447000, C455S450000
Reexamination Certificate
active
07363039
ABSTRACT:
In many cellular systems, reusing spectrum bandwidth, creates problems in boundary regions between the cells and sectors where the signal strength received from adjacent base stations or adjacent sector transmissions of a single base station may be nearly equivalent. The invention creates a new type of diversity, referred to as multiple carrier diversity by utilizing multiple carriers, assigning different power levels to each carrier frequency at each base station, and/or offsetting sector antennas. The cell and/or sector coverage areas can be set so as to minimize or eliminate overlap between cell and/or sector boundary regions of different carrier frequencies. Mobile nodes traveling throughout the system can exploit multiple carrier diversity by detecting carriers and selecting to use a non-boundary carrier based on other system criteria in order to improve performance. Boundary carriers may, but need not be, identified and excluded from consideration for use by a wireless terminal.
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Laroia Rajiv
Li Junyi
Uppala Sathyadev Venkata
Desir Pierre-Louis
Gary Erika A.
Qualcomm Incorporated
Straub Michael P.
Straub Ronald P.
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