New code match strategy for wideband code division multiple access code tree management^①

来源期刊：中南大学学报(英文版)2006年第3期

论文作者：杨宗凯 刘光然 何建华

文章页码：265 - 269

Key words：orthogonal variable spreading factor; code placement strategy; code match strategy; code blocking probability

Abstract: Orthogonal variable spreading factor channelization codes are widely used to provide variable data rates for supporting different bandwidth requirements in wideband code division multiple access (WCDMA) systems. A new code match scheme for WCDMA code tree management was proposed. The code match scheme is similar to the existing crowed-first scheme. When choosing a code for a user, the code match scheme only compares the one up layer of the allocated codes, unlike the crowed-first scheme which perhaps compares all up layers. So the operation of code match scheme is simple, and the average time delay is decreased by 5.1%. The simulation results also show that the code match strategy can decrease the average code blocking probability by 8.4%.