基于TDD的低轨卫星跳波束资源分配算法

Novel research on beam hopping resource allocation algorithm of Low Earth Orbit satellite based on TDD

摘要:

低轨(LEO)卫星跳波束技术可以灵活分配系统资源，适用于业务分布不均匀的场景。时分双工(TDD)方式可以减少星载和地面终端设备的天线数量，有效降低其复杂度，并有利于开展上下行非对称业务。本文提出一种基于TDD的LEO卫星跳波束资源分配算法，在满足业务需求的基础上，以最小化时域资源消耗为目标，建立支持跳波束和多频时分多址接入(MF-TDMA)机制的LEO卫星反向链路资源分配模型；综合考虑星地动态时延补偿，采取一种多层次的跳波束时隙架构设计，以最大化可用时隙为目标，建立上下行时隙切换模型，并提出一种基于TDD的跳波束时隙排布优化方法。仿真结果表明，对比于传统的MF-TDMA资源分配方法或固定多波束均分算法，本文提出的算法能有效提高系统的时隙利用率和吞吐量。

Abstract:

In the Low Earth Orbit(LEO) scenario, beam hopping technology can flexibly allocate system resources and is suitable for the scenario of uneven service distribution. Time Division Duplex (TDD) mode has low requirements on the terminal and is conducive to the development of upstream and downstream asymmetric services. Therefore, a resource allocation algorithm is proposed for low-orbit satellite beam hopping based on TDD. Firstly, the resource allocation model of LEO reverse link supporting beam hopping and Multifrequency-Time Division Multiple Access(MF-TDMA) is established to minimize the time domain resource consumption in condition of satisfying the service requirements. Secondly, considering the dynamic time-delay compensation of satellite and earth, a multi-level beam hopping time slot architecture design is adopted to maximize the available time slot. The upstream and downstream time slot switching model is established, and a beam hopping time slot scheduling optimization method is proposed based on TDD. Simulation results show that compared with traditional MF-TDMA resource allocation method or fixed multi-beam splitting algorithm, the proposed algorithm can effectively improve the time slot utilization and throughput of the system.