基于LTE的高铁通信网络无线资源管理研究

Research on Radio Resource Management in High-speed Railway Communication Networks Based on LTE

随着高铁无线通信量的不断增加,发展无线资源管理技术以实现资源的高效利用已成为必然。然而,由于快速移动列车与基站之间通道条件的动态性,以及运营和客运服务对服务质量要求的多样性,使得设计此类技术具有相当的挑战。以双跳高铁通信网络架构为基础,通过将随机问题转化为队列稳定性问题,研究在平均延迟、队列稳定性和平均功率约束下最大化系统效用。利用Lyapunov漂移理论,将队列稳定性问题分解为独立的凸子问题。利用静态资源管理算法对资源分配子问题进行最优求解。在此基础上,提出了一种动态资源管理算法。在MATLAB上进行的仿真结果表明,该方法在满足平均时延要求的同时,提高了吞吐量性能和链路容量。

The increasing amount of wireless traffic in HSR necessitates the development of radio resource management techniques to enable the efficient resource utilization.However,the design of such techniques is quite challenging due to the very dynamic channel conditions between the fast moving train and base stations,and the operational and passenger services with heterogeneous QoS requirements.Based on the two-hop HSR communication network architecture,some studies are carried out on maximizing system utility under the constraints of average delay,queue stability and average power by formulating a stochastic problem which is transformed into a queue stability problem.Using Lyapunov drift theory,the queue stability problem is decomposed into separate convex subproblems.Static resource management algorithm is used to achieve an optimal solution for the resource allocation subproblem.Then,a dynamic resource management algorithm is proposed.Numerical simulations is performed on MATLAB and the results show that the proposed approach provides an improved throughput performance and enhanced link capacity,while satisfying the average delay requirements.