Methods and communications terminals for increasing capacity...

Details Methods and communications terminals for increasing capacity... Methods and communications terminals for increasing capacity...

2001-11-14

2003-12-09

Chin, Willington (Department: 2664)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

C375S147000

Reexamination Certificate

active

06661809

ABSTRACT:

FIELD OF THE INVENTIONS
The present inventions relate generally to code division multiple access (CDMA) communications systems, and more particularly to methods and communications terminals for increasing capacity in CDMA communications systems.
BACKGROUND OF THE INVENTIONS
It has been proposed to increase forward link capacity in code division multiple access (CMDA) communication systems by using pilot signal cancellation processing. Intel Corporation, “CPICH Interference Cancellation as a Means for Increasing Downlink Capacity”, 3GPP TSG-RAN Working Group, TSGR1-00-1371, November 2000; Intel Corporation, “Further Results on CPICH Interference Cancellation as A Means for Increasing DL Capacity”, 3GPP TSG-RAN Working Group, TSGR1-01-0030, January 2001; Intel Corporation, “CPICH Interference Cancellation as A Means for Increasing DL Capacity”, 3GPP TSG-RAN Working Group, TSGR4-01-0238, February 2001.
It is known to subtract reconstructed pilot signals prior to Rake receiver de-spreading and integration as disclosed for example in U.S. Pat. No. 6,009,089 entitled “Pilot Interference Cancellation For A Coherent Wireless Code Division Multiple Access Receiver” and in U.S. Pat. No. 5,978,413 entitled “Method And System For Processing A Plurality of Multiple Access Transmissions”. It is also known to subtract pilot channel interference at the symbol rate from the output of the Rake receiver, as disclosed for example in U.S. Pat. No. 6,009,089 entitled “Pilot Interference Cancellation For A Coherent Wireless Code Division Multiple Access Receiver”, WO 01/05052 entitled “Interference Suppression In A CDMA Receiver”, U.S. Pat. No. 5,323,418 entitled “Code Division Multiple Access Inbound Messaging System Utilizing Interference Cancellation to Recover Inbound Messages”, and WO 98/43362 entitled “Method And Apparatus For Reducing Spread-Spectrum Noise”.
There is a 3GPP proposal to ameliorate paging channel interference resulting from the synchronization channel by adopting a moving offset between the synchronization channel and the paging channel. The moving offset however does not reduce the interference, but instead evenly divides it, temporally, among the user equipment (UE). The moving offset moreover does not eliminate interference caused by the synchronization channel to other channels, such as data, which includes voice traffic.
The various aspects, features and advantages of the present invention will become more fully apparent to those having ordinary skill in the art upon careful consideration of the following Detailed Description of the Invention with the accompanying drawings described below.


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patent: WO 92/11722 (1992-07-01), None
patent: WO 94/00917 (1994-01-01), None
patent: WO 98/43362 (1998-10-01), None
patent: WO 01/05052 (2001-01-01), None
patent: WO 01/35564 (2001-05-01), None

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