Non-geostationary (Non-GSO) satellite constellations have emerged as a promising solution to enable ubiquitous high-speed low-latency broadband services by generating multiple spot-beams placed on the ground according to the user locations. However, there is an inherent trade-off between the number of active beams and the complexity of generating a large number of beams. This paper formulates and solves a joint beam placement and load balancing problem to carefully optimize the satellite beam and enhance the link budgets with a minimal number of active beams. We propose a two-stage algorithm design to overcome the combinatorial structure of the considered optimization problem providing a solution in polynomial time. The first stage minimizes the number of active beams, while the second stage performs a load balancing to distribute users in the coverage area of the active beams. Numerical results confirm the benefits of the proposed methodology both in carrier-to-noise ratio and multiplexed users per beam over other benchmarks.
翻译:非地球静止卫星星座(非地球同步卫星星座)已成为一个大有希望的解决办法,通过根据用户地点,在地面上产生多个点光束,从而能够提供无处不在的高速低纬度宽带服务,但活动光束的数量与产生大量光束的复杂性之间有着内在的权衡。本文提出并解决了联合波束放置和负载平衡问题,以仔细优化卫星光束,并用少量活动光束加强连接预算。我们提议了两阶段算法设计,以克服所考虑的优化问题的组合结构,在多元时间提供解决办法。第一阶段尽量减少活动光束的数量,而第二阶段则进行负荷平衡,以便在活动光束的覆盖地区分配用户。数字结果证实了拟议方法在承运人到噪音的比例和每个多轴用户的比其他基准方面的好处。