Multi-level sectorized CDMA communications

Details Multi-level sectorized CDMA communications Multi-level sectorized CDMA communications

1997-02-19

2000-09-19

Pham, Chi H.

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

455446, H04B 7216, H04Q 720

Patent

active

061222666

ABSTRACT:
A base station of a code division multiple access (CDMA)-based communications network (e.g., one conforming to the IS-95 standard) is sectorized such that, a first subset of CDMA channels are communicated using a first level of cell-site sectorization and a second subset of CDMA channels, different from the first subset, are communicated using a second level of cell-site sectorization, different from the first level. For example, the first set of CDMA channels may be the pilot and sync channels and the second subset of CDMA channels may be the access, paging, and traffic channels. In one set of implementations, at the first sectorization level, each cell site is omnidirectional (for the first subset of CDMA channels), while, at the second sectorization level, each cell site is divided into two or more sectors (for the second subset of CDMA channels). In this set of implementations, each cell site is assigned one pseudo noise (PN) offset and transmits one pilot channel. In another set of implementations, at the first sectorization level, each cell site is divided into two or more sectors (for the first subset of CDMA channels), while, at the second sectorization level, each sector is further divided into two or more sub-sectors (for the second subset of CDMA channels). In this set of implementations, each sector is assigned one PN offset and each cell site transmits a different pilot channel for each sector. In either case, the present invention is able to provide certain advantages of sectorization (e.g., increased capacity and reduced interference) while reducing certain disadvantages of sectorization (e.g., pilot pollution, handoff processing). Moreover, the present invention can be implemented to support existing remote terminals (e.g., mobile/cellular telephones) having three-finger RAKE receivers.

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