基于多用户MIMO的小小区重分配的能量和频谱效率增益
Energy and Spectral Efficiency Gains From Multi-User MIMO-based Small Cell Reassignments
摘要：
在这项工作中，我们研究了相邻的小小区之间的用户设备（UE）的重新分配，同时使空间复用增益通过多用户MIMO（MU-MIMO）和减少能源消耗，通过切换空的小小区到睡眠状态。我们考虑UE可以在相邻的小小区之间被重新分配的情况，只要目标相邻小区包含被重新分配的UE可以在不经历过度多用户干扰的情况下与之执行MU-MIMO的UE，并且同时作为结果在先前的原始小区传输上实现频谱效率的最小预期增益。我们制定的选择决定，其中UE重新分配为一组覆盖问题的目标是最大限度地增加切换到睡眠状态的小小区基站的数量。我们的研究结果表明，对于室内和室外LTE小小区场景，所提出的基于MU-MIMO的重新部署实现了所需的活动小小区基站数量的显着减少，同时实现了频谱效率的提高。
英文摘要：
In this work we investigate the reassignment of User Equipments (UEs) between adjacent small cells to concurrently enable spatial multiplexing gains through Multi-User MIMO (MU-MIMO) and reductions in energy consumption though switching emptied small cells to a sleep state. We consider a case where UEs can be reassigned between adjacent small cells provided that the targeted neighbouring cell contains a UE with which the reassigned UE can perform MU-MIMO without experiencing excessive multi-user interference, and whilst achieving a minimum expected gain in spectral efficiency over the previous original cell transmissions as a result. We formulate the selection decision of which UEs to reassign as a set covering problem with the objective of maximising the number of small cell base stations to switch to a sleep state. Our results show that, for both indoor and outdoor LTE small cell scenarios, the proposed MU-MIMO-based reassignments achieve significant reductions in the required number of active small cell base stations, whilst simultaneously achieving increases in spectral efficiency.
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