Discussion and Limitation

Access Satellite Selection: In this paper, we have evaluated the performance of different kinds of access satellite selection strategies. We find that the consistent strategy can considerably reduce the number of handover while the flexible strategy can provide higher-quality service yet result in more handover. It still remains an open problem whether these two access satellite selection strategies or another option is suitable for the mobile satellite network, which is beyond the scope of the research work in this paper. We believe the access satellite selection scheme is highly related to the applications and leave it for future work.

在本文中，我们评估了不同类型接入卫星选择策略的性能。我们发现，持续性策略（consistent strategy）能够显著减少切换次数，而灵活性策略（flexible strategy）则能提供更高质量的服务，但会导致更频繁的切换。这两种接入卫星选择策略或是否存在其他更优选项适合于卫星移动网络，目前仍是一个开放性问题，这超出了本论文的研究范畴。我们认为，接入卫星选择方案与具体的应用需求高度相关，并将其留作未来的研究工作。

Access Satellite of Ground Station: In this paper, we have only discussed the update process of access satellites. However, changes can also occur for the access satellites corresponding to ground stations. Due to the relatively small number and fixed positions of ground stations, satellites can adapt to these changes through updates in their own routing strategies, without the need for reflection in the mobile network’s signaling procedures.

在本文中， 我们仅讨论了用户终端接入卫星的更新过程。然而，地面站对应的接入卫星同样可能发生变化。

由于地面站的数量相对较少且位置固定，卫星可以通过更新自身的路由策略来适应这些变化，而无需在移动网络的核心信令流程中予以体现。