NEW UMTS 3G PATENT for IDCC.IMO:Required by BenQ,LG., etc....
United States Patent 6,907,010
Zhang June 14, 2005
Dynamic radio link adaptation for interference in cellular systems
Abstract
A dynamic link adaptation technique employed in a cellular system by a user equipment (UE) having two coded composite transport channels (CCTrCHs) in an uplink time slot begins by estimating transmit power using a transport format combination (TFC) pair for the CCTrCHs. The total estimated transmit power for two CCTrCHs is compared with a given threshold. The use of both TFCs is permitted when the total estimated power is less than the threshold. A power of each TFC is compared with the threshold and the TFC whose estimated power is greater than the threshold is blocked. A medium access control (MAC) is advised that one TFC is blocked, and the MAC notifies a codec associated with the TFC whose estimated power is less than that threshold to reduce the data rate when applicable.
Inventors: Zhang; Guodong (Patchogue, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 322161
Filed: December 18, 2002
SUMMARY
The invention provides a method of dynamic radio link adaptation in the presence of variable interference conditions in cellular systems. The invention offers a solution to perform dynamic link adaptation properly when the UE has two CCTrCHs in an uplink time slot. The invention also provides details of the preferred implementation, and strategies and algorithms by which cellular networks can dynamically adapt a radio link according to the change of interference. In particular, it is applicable to UMTS-TDD systems. It is to be noted that this invention is applicable to UMTS-FDD, CDMA-2000 and other systems as well.
