提高LTE中继蜂窝系统吞吐量的新方案

New scheme for improving throughput in LTE relay cellular system

中继(Relay)可以扩大基站覆盖范围,提高边缘用户的吞吐量,但同时会对现有的直传用户产生干扰,破坏了蜂窝用户占用无线资源的公平性。为了解决此问题,提出了新的资源分配(NRA)方案,在保证直传用户和中继用户服务质量需求的前提下,首先在第二时隙,给每一条接入链路选择最佳的直传链路来共享资源块。然后,在第一时隙先给回程链路分配资源块,再将剩余的资源块分配给直传链路,保证整体吞吐量最大。仿真表明,与之前的方案相比,NRA方案能够有效改善整个蜂窝系统的公平性和吞吐量。

The Relay can expand the coverage of the base station and improve the throughput of the edge users, but it may generate interference to the direct link users and destroy the fairness of the cellular users at the same time. To solve this problem, this paper presents a new resource allocation （NRA） scheme. Under the premise of guaranteeing the quality of service for the direct link users and the relay link users, the optimal direct link is selected for access link to share the resources, and then the resources are allocated in turn to the backhaul links and the direct links. Simulation results show that the NRA scheme can effectively improve the fairness and the throughput of the whole cellular system.