WCDMA系统中Internet访问性能的优化

Performance Optimization of Internet Access in WCDMA

为提高在WCDMA系统中进行无线Internet访问的性能,研究了一种基于代理的新机制,并运用排队论建立起解析模型以分析其性能.新机制充分利用了数据业务对延时不敏感的特性,可以在不降低利用率的前提下缩短系统的平均响应时间.同时,分析结果表明,在上述系统中影响平均响应时间的关键参数是并行的传输信道数.为此,进一步讨论了并行信道数的选择与系统性能的优化问题,并针对网络的时变特性给出了一种自适应信道调整的算法.仿真试验表明自适应算法可以在各种业务条件下有效地缩短系统的平均响应时间.

This paper studies a proxy-based scheme to improve the performance of Internet Access in WCDMA, and develops a queuing model for its analysis. By exploiting the relative delay tolerance of data service, new Scheme can reduce average response time while keeping high network utilization. Furthermore, analytical results show that the key factor affecting average response time is the number of parallel channels. Therefore we studied the channel configuration and performance optimization of such system, and developed an Adaptive Channel Adjustment Algorithm (ACAA) to support the system in a varying environment. Simulation results show that the ACAA can reduce average response time significantly on unknown and possible varying traffic conditions.