摘要
动态TDD技术的引入不仅能够很好地解决突发性业务需求增长较快的问题,还能提升小区通信系统的服务质量。在动态TDD系统中,无线帧配置可以通过系统中的负载量来改变。但是一些子帧可能会在重配后改变传输方向,导致一些HARQ进程出现时序冲突,影响系统性能。为了解决动态TDD系统中的HARQ时序冲突问题,提出了一种基于过渡无线帧的混合自动重传方案。当重配周期到来时,在重配点后增加一个过渡无线帧,使得HARQ时序以一种较简单、时序冲突较少的方式过渡到重配后的无线帧。在LTE系统仿真平台上建立HARQ模型进行性能验证,仿真结果表明,所提方案能有效地提升系统资源利用率,并给系统平均吞吐量带来增益。
Dynamic TDD system was introduced to satisfy the increasing business requirement and improve the sys- tem performance. In the dynamic TDD system, the frame configuration can be changed based on the traffic load. Since some subframes may change their transmission direction after reconfiguration, some HARQ process will be- come useless. In order to solve the collision problem of HARQ timing in dynamic TDD system, hybrid automatic re- transmission scheme based on transitional radio frame was proposed. A radio frame will be added after the reconfi- guration point. HARQ timing can transit to the reconfigured frame in a simple way with few collisions. Performance evaluation was provided to show the effectiveness of the scheme. Using the proposed scheme can bring benefits to the system average throughput and improve the system resource utilization rate.
出处
《电信科学》
北大核心
2017年第5期46-54,共9页
Telecommunications Science
关键词
动态TDD
混合自动重传
过渡无线帧
时序冲突
dynamic TDD, hybrid automatic retransmission, transitional radio frame, timing sequence collision
