蜂窝异构网络中的最优频谱分配算法

摘要

异构网络通过在宏基站的覆盖范围内密集地部署低功率的节点, 使小区得到分化, 提升信道增益.但由于频谱资源有限, 资源分配在带有中继节点的蜂窝异构网络中变得较为复杂.为改善信道的频谱效率, 研究在带有中继节点异构网络中的最优频谱分配策略以及对应的用户接入策略, 提出一个基于乘子法的高效算法, 通过在乘子法迭代中寻找一组有限的频谱复用模式, 得到最优的频谱分配和用户接入策略, 实现最优的比例公平性.数值仿真结果表明, 该算法可有效利用有限的频谱资源, 相对于传统的频谱分配策略, 网络性能明显提升.%The Heterogeneous Network (HetNet) differentiates cells and improves channel gain by densely deploying low-power nodes within the coverage of the macro Base Station (BS). However, due to limited spectrum resources, resource allocation is complicated in cellular heterogeneous networks with relay nodes. In order to improve the spectral effciency of the channel, the optimal spectrum allocation strategy and corresponding user access strategy in heterogeneous networks with relay nodes are studied. An efficient algorithm based on multiplier method is proposed. By finding a limited set of spectrum reuse patterns in the multiplier method iteration, the optimal spectrum allocation and user access strategy are obtained to achieve optimal Proportional Fairness (PF). Numerical simulation results show that the algorithm can effectively utilize limited spectrum resources, and the network performance is significantly improved compared with the traditional spectrum allocation strategy.