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IS-95 CDMA and cdma2000: Cellular/PCS Systems Implementation by PhD, PE - Department of Electrical Engineering and Computer Science, University of Illinois at Chicago, Chicago, Illinois U.S.A. Vijay K. Garg

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Chapter 10 Soft Handoff and Power Control in IS-95 CDMA

10.1 Introduction

Soft handoff is different from the traditional hard-handoff process. With hard handoff, a definite decision is made on whether to hand off or not. The handoff is initiated and executed without the user attempting to have simultaneous traffic channel communications with the two base stations. With soft handoff, a conditional decision is made on whether to hand off. Depending on the changes in pilot signal strength from the two or more base stations involved, a hard decision will eventually be made to communicate with only one. This normally happens after it is evident that the signal from one base station is considerably stronger than those from the others. In the interim ...

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