Robust and Efficient Multi-Cell Cooperation under Imperfect CSI and Limited Backhaul
Robust and Efficient Multi-Cell Cooperation under Imperfect CSI and Limited Backhaul
复制标题
DOI：
10.1109/twc.2013.030413.121247
复制
发表时间：
2013-03
影响因子：
10.4
通讯作者：
P. Rost
中科院分区：
文献类型：
--
作者：
P. Rost
未来的蜂窝网络需要更有效地收集现有的频谱资源。因此，网络将以更高的密度部署，以增加空间重用。这将需要先进的干扰缓解技术，以科普增加的干扰水平。在本文中，双向干扰信道分析作为一个典型的小区间干扰的情况下的模型。基于该模型，推导出一种新的小区间干扰抑制方法。这种新方法通过将上行链路和下行链路不对称地分配给通信对来重塑干扰，即。例如，一个通信对在上行链路中操作，而相邻的通信对在下行链路中操作。此外，考虑回程资源，其用于在无线电接入点之间交换支持信息并支持干扰减轻过程。所介绍的方法相比，采用联合传输和接收算法的合作多点技术。在考虑有限的回程资源和不完善的信道状态信息的情况下进行评估。它示出了非对称地分配上行链路和下行链路能够优于用于接近小区边界的终端的协作多点技术，其中与非协作传输相比增益高达约20%，与CoMP相比增益高达10%。
Future cellular networks need to harvest existing spectral resources more efficiently. Hence, networks will be deployed at a higher density in order to increase the spatial reuse. This will require advanced interference mitigation techniques that allow to cope with the increased interference level. In this paper, the two-way interference channel is analyzed as a model for a typical inter-cell interference scenario. Based on this model, a new inter-cell interference mitigation approach is derived. This new approach reshapes interference by asymmetrically assigning uplink and downlink to communication pairs, i. e., one communication pair operates in uplink while an adjacent communication pair is in downlink. In addition, backhaul resources are taken into account, which are used to exchange support information between radio access points and to support the interference mitigation process. The introduced approach is compared to cooperative multi-point techniques which employ joint transmission and reception algorithms. The evaluation is done under consideration of limited backhaul resources and imperfect channel state information. It shows that assigning uplink and downlink asymmetrically is able to outperform cooperative multi-point techniques for terminals close to the cell border with gains of up to about 20% compared to non-cooperative transmission and 10% compared to CoMP.