LTE-Advanced系统中改进的载波聚合HARQ进程映射机制

Improved mapping mechanism of carrier aggregation and HARQ in LTE-Advanced system

分析了LTE-Advanced系统在引入载波聚合技术以后,混合自动重传请求(HARQ)进程映射机制的设计问题。简述了载波聚合技术和HARQ技术原理,介绍了目前载波聚合中的HARQ映射方式,指出目前映射方式存在的问题,并针对该问题提出了一种半静态可变HARQ进程映射方案,在不同条件下对该方案进行了仿真分析,仿真结果说明新方案实现了对分集增益与开销的折中,能够改善系统综合性能,具有良好的应用前景。

This paper analyzes how to design the hybrid automatic repeat request （HARQ） mapping mechanism in LTE- Advanced system using the technology of carrier aggregation. First the basic conception of carrier aggregation and HARQ was introduced. And then, the current HARQ mapping mechanisms and their existing problems were presented. Finally, a semi-static HARQ mapping mechanism was proposed to solve these problems. By link simulations under different conditions, it was proved that the new mechanism achieved the compromise of diversity gain and overhead, improved the comprehensive performance of system and had a good application prospect.