Optimization of SHO margin in WCDMA network

2008 Annual IEEE India Conference Pub Date : 2008-12-01 DOI:10.1109/INDCON.2008.4768745

S. Tamilselvan, N. Thyagarajeswara Naidu, K. Manivannan

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引用次数: 2

Abstract

The focus of the paper is to analyze the downlink performance of a wideband code division multiple access (WCDMA) system with site selection diversity transmission (SSDT) power control during soft handover (SHO) mode and to find the optimum SHO margin (MSH) in terms of maximum system capacity under energy-per-bit to noisespectral density ratio (Eb/No) quality requirements. Analyzing the dependency of the connection probabilities, percentage of users connected to one, two, or three Base Stations (BSs) simultaneously as a function of the MSH. Analyzed the system capacity and required resources dependency on MSH for voice service and combined multimedia mobile services. System capacity dependency on MSH is analyzed, by considering two types of user distributions, namely 1) uniform user distribution and 2) a concentration of all the users in the location that requires maximum transmitted power (the worst case). The result of this analysis shows an increase in user capacity of about 16% - 20% for the optimum MSH of 5-5.5dB. Nevertheless, the resources required (number of scrambling codes) by the base station increases faster than the number of active users in terms of MSH.

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WCDMA网络SHO余量的优化

本文重点分析了具有选址分集传输(SSDT)功率控制的宽带码分多址(WCDMA)系统在软切换(SHO)模式下的下行性能，并在每比特能量与噪声频谱密度比(Eb/No)质量要求下，根据最大系统容量找到最优的SHO裕度(MSH)。分析连接概率的依赖性，即同时连接到一个、两个或三个基站(BSs)的用户百分比作为MSH的函数。分析了MSH对语音业务和组合多媒体移动业务的系统容量和所需资源的依赖性。通过考虑两种类型的用户分布，即1)均匀用户分布和2)所有用户集中在需要最大传输功率的位置(最坏情况)，分析了系统容量对MSH的依赖性。分析结果表明，在5-5.5dB的最佳MSH下，用户容量增加了约16% - 20%。然而，就MSH而言，基站所需资源(加扰码数)的增长速度快于活跃用户数量的增长速度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2008 Annual IEEE India Conference

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