WCDMA高速上行分组接入技术性能研究

Study of Performance of WCDMA System with High Speed Uplink Packet Access

在高速上行分组接入(HSU PA)中通过采用N odeB控制调度、结合软合并的混合自动重传请求(HARQ)、更短的传输时间间隔(TTI)等关键技术,可使用户设备(U E)能以尽可能高的功率传输H SUPA数据,在减少时延的基础上得到更大的系统上行吞吐量。系统级仿真结果表明这些关键技术的引入对W CD M A通信系统上行数据传输带来了性能的提高。文章认为由于调度器的变化,不同调度算法在HSU PA系统中的表现有很大差别,需要进一步根据W CD M A系统业务的特点,设计更适合分布式调度器的调度算法,以进一步提高系统性能。

The High-Speed Uplink Packet Access （HSUPA） adopts NodeB controlled scheduling, Hybrid Automatic Repeat Request （HARQ） with chase combining, shorter Transmission Time Interval （TTI） and other technologies, which makes the user equipment transmit HSUPA data with the highest power and achieve higher system uplink throughput with shortened time delay. System-level simulation results show that the introduction of key technologies greatly improves the HSUPA data transmission in a WCDMA system. Different schedulers have different scheduling algorithms that bring about quite different performances of an HSUPA system. Therefore, it is expected to further consider the characteristics of WCDMA systems and work out better scheduling algorithms for distributed schedulers in order to obtain higher system performance.