| US 7,539,162 B2 | ||
| Walsh code management in a code division multiple access cellular wireless communication system | ||
| Chang-Gang Zhang, Plano, Tex. (US); Farhad Bassirat, Plano, Tex. (US); and Martin Kendall, Wylie, Tex. (US) | ||
| Assigned to Nortel Networks Limited, St. Laurent, Quebec (Canada) | ||
| Filed on Dec. 24, 2001, as Appl. No. 10/35,846. | ||
| Prior Publication US 2005/0041612 A1, Feb. 24, 2005 | ||
| Int. Cl. H04W 4/00 (2006.01) | ||
| U.S. Cl. 370—331 [370/342] | 10 Claims |
| 1. A method for managing Walsh Codes in a Code Division Multiple Access (CDMA) cellular wireless communication system, the
method comprises:
allocating a number of Walsh Codes in the CDMA cellular wireless communication system to a group of cell(s) or sector(s);
setting a handoff participation limit to a maximum participation limit, where the handoff participation limit determines a
maximum number of cells or sectors that may participate in handoff with any serviced mobile terminal;
when an available number of the number of Walsh Codes becomes less than a first Walsh Code availability threshold, reducing
the handoff participation limit to a first participation limit that is less than the maximum participation limit;
when an available number of the number of Walsh Codes becomes less than a second Walsh Code availability threshold, that is
less than the first Walsh Code availability threshold, reducing the handoff participation limit to a second participation
limit that is less than the first participation limit; and
for any mobile terminal participating in handoff with a number of cells or sectors that exceeds the handoff participation
limit, terminating forward link transmissions from a corresponding number of servicing cell(s) or sector(s) and releasing
a corresponding number of Walsh Code(s).
|