Next-generation satellite systems require more flexibility in resource management such that available radio resources can be dynamically allocated to meet time-varying and non-uniform traffic demands. Considering potential benefits of beam hopping (BH) and non-orthogonal multiple access (NOMA), we exploit the time-domain flexibility in multi-beam satellite systems by optimizing BH design, and enhance the power-domain flexibility via NOMA. In this paper, we investigate the synergy and mutual influence of beam hopping and NOMA. We jointly optimize power allocation, beam scheduling, and terminal-timeslot assignment to minimize the gap between requested traffic demand and offered capacity. In the solution development, we formally prove the NP-hardness of the optimization problem. Next, we develop a bounding scheme to tightly gauge the global optimum and propose a suboptimal algorithm to enable efficient resource assignment. Numerical results demonstrate the benefits of combining NOMA and BH, and validate the superiority of the proposed BH-NOMA schemes over benchmarks.
翻译:下一代卫星系统在资源管理方面需要有更大的灵活性,以便可以动态地分配现有无线电资源,以满足时间变化和非统一交通需求。考虑到横冲刺(BH)和非横贯多重访问(NOMA)的潜在好处,我们利用多波束卫星系统的时间空间灵活性,优化BH设计,并通过NOMA加强动力领域的灵活性。在本文件中,我们调查梁冲刺和NOMA的协同作用和相互影响。我们共同优化电力分配、波束排列和终端时间分配,以尽量减少所要求的交通需求与提供能力之间的差距。在解决方案开发过程中,我们正式证明优化问题的NP硬性。接下来,我们制定了一个约束性计划,以严格衡量全球的最佳性,并提出一种亚优性算法,以便能够有效地分配资源。数字结果显示将NOM和BH结合起来的好处,并验证拟议的BH-NOMA计划优于基准。