Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Reexamination Certificate
2009-05-22
2011-11-01
Rao, Seema S. (Department: 2462)
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
C370S342000
Reexamination Certificate
active
08050234
ABSTRACT:
A cellular wireless communication system and method of operation manages Walsh codes in order to ensure that sufficient Walsh codes are available to prevent call blocking and to support additional hand-off operations. In an initial operating condition, the cellular wireless communication system services normal hand-off operations in which a maximum number of cells and sectors may participate in hand-off. With hand-off operations according to the present invention, each cell or sector participating in hand-off for a mobile terminal uses a unique Walsh code for covering its forward link signals. When the number of Walsh codes available for servicing new calls is reduced so that it meets or exceeds a Walsh code availability threshold, the number of cells and sectors that may participate in hand-off is reduced from the maximum number. In the number of participating cells/sectors results in release or non-use of some Walsh codes. In subsequent operations when sufficient Walsh codes are available for servicing hand-off operations, a greater number, up to the maximum number of cells and sectors may again participate in hand-off of the mobile terminal.
REFERENCES:
patent: 6160798 (2000-12-01), Reed et al.
patent: 7280581 (2007-10-01), Khan
patent: 2001/0051520 (2001-12-01), Johansson et al.
patent: 2005/0221828 (2005-10-01), Wakuta et al.
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Bassirat Farhad
Kendall Martin
Zhang Chang-Gang
Ericsson AB
Garlick & Harrison & Markison
Murphy Rhonda
Rao Seema S.
Smith Kevin L.
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