功率控制是使CDMA系统容量最大化的关键技术之一 .在IMT 2 0 0 0指定的宽带码分多址接入 (WCD MA)系统中 ,实现高精度的快速闭环功率控制的基础是内环SIR的精确测量 .由此 ,基于 3GPP协议 ,本文提出了一种新的易实现模块化的内环SIR测量的方法 ,在原理和性能上与Shunsuke所提SIR的测量方法进行了比较 ,通过仿真证明了新方法测量性能的优越性 ,并给出了基于业务质量的快速闭环功率控制的性能 Power control is one of the key technologies for maximizing the capacity of a CDMA system.On the basis of the WCDMA (Wideband Code Division Multiple Access) system designated by IMT 2000, the basis for high-precision, fast closed-loop power control is the inner loop SIR.In this paper, based on the 3GPP protocol, this paper presents a new method to realize the modular inner loop SIR measurement, which is compared with the measurement method of Shunsuke’s SIR in principle and performance. Through the simulation The superiority of the new method in measuring performance is proved and the performance of fast closed-loop power control based on the quality of service is given