InterDigital Inc (IDCC)

[Gamco]

United States Patent 7,801,548
Koo , et al. September 21, 2010
Method and system for adjusting downlink outer loop power to control target SIR

Abstract
A wireless communication system and method for controlling transmission power to maintain a received signal-to-interference ratio (SIR) as close as possible to a target SIR. A received quality is maintained as close as possible to a target quality based on block error rate (BLER). When a target BLER is converted to an initial target SIR, an error may occur due to a channel condition mismatch, since the target SIR required for the target BLER varies with channel conditions. An outer loop power control process is used to set a target SIR for each coded composite transport channel (CCTrCH) based on the required target BLER. The process adjusts a SIR step size parameter to maximize the convergence speed of the process.

Inventors: Koo; Chang-Soo (Melville, NY), Shin; Sung-Hyuk (Northvale, NJ), Dennean; Charles (Melville, NJ)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 11/891,171
Filed: August 9, 2007
Related U.S. Patent Documents
Application Number Filing Date Patent Number Issue Date
10771576 Feb., 2004 7266385
10659673 Nov., 2006 7133689
60410781 Sep., 2002
Current U.S. Class: 455/522 ; 455/115.1; 455/504; 455/69
Current International Class: H04B 7/00 (20060101)
Field of Search: 455/522,69,127.1,67.11,67.13,115.1,115.3,115.4,504,505,506,453 370/318,340,329,280,392,252,276