WCDMA Iub接口流量控制算法设计与实现

Study and Realization of Flow Control Algorithm of Iub Interface in WCDMA System

在WCDMA系统中,Iub接口是UTRAN(UMTS无线接入网)内的无线接口,用于连接UTRAN中的Node B和RNC,是Node B侧承载用户数据的重要接口。本文通过对已有流控算法的分析,研究了基于Iub Buffer占用率的反压流控算法和基于上行负载因子修正的流控算法,针对反压流控拥塞门限不可变的缺陷,采用上述两种算法相结合来缓解Iub接口的拥塞、提高系统的吞吐率。并通过对Node B传输层和系统的吞吐率进行仿真,验证了该算法的有效性。

lub is a wireless interface of WCDMA system, which connects Node B and RNC in UTRAN, which is used to cant data for communication of Node B. In this paper, by analyzing and revising previous algorithms, we study two flow control methods： anti-pressure flow control algorithm and modification arithmetic. Through combining two algorithms above, we can ease congestion of Iub interface and improve system＇s throughput. At last we verify the algorithm＇s validity with different scenario conditions and simulation parameters.