Introduction and Forward Link Power Control By Dr. Ernest Simo 31.0 What are the Reverse Link and Forward Link Power Control strategies in IS-95? Power Control Strategies in IS-95 consist of a Reverse Link Power Control strategy and a Forward Link Power Control strategy. The Reverse Link strategy further consists of Open Loop Power Control techniques and Closed Loop Power Control techniques: In Open Loop Power Control strategies, the Mobile Unit uses the received pilot signal strength and internal algorithms to estimate and adjust its own Transmit power. It is a coarse Power Estimation method. In Closed Loop Power Control strategies, the Mobile Unit receives 800 power control bits per second from the Base Station. It then uses these power control bits to adjust, on a continuous basis, its transmit power. It is a fine-tune, dynamic Power Correction method. The Forward Link Power Control strategy is a Closed Loop method. Because of a better orthogonality of Walsh codes in the Forward Link, fast power control is not required. So, this process, based on Frame-Error Rate Measurement, is a much slower mechanism than that used in the Reverse Link. Click here to view Figure 21 © 2001 DR. ERNEST SIMO - SPACE2000

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