基于用户组簇的LTE上行链路联合调度和功率分配算法

Cooperative scheduling and power allocation scheme based on user clustering in LTE uplink

在同频组网的LTE系统中,严重的小区间干扰成为限制小区边缘用户性能提升的瓶颈.在LTE上行链路中,传统的单小区独立调度算法并未考虑小区间干扰情况.为此,提出了一种基于用户组簇的联合调度和功率分配方案,以抑制小区间干扰,提升系统性能.该方案对来自不同小区的用户组簇,以用户簇为对象执行基于正比例公平(PF)准则的联合调度,并根据簇内用户相互干扰情况建立功率优化模型,通过求解该模型次优解得到联合功率分配方案.系统仿真结果表明,基于用户组簇的联合调度和功率分配方案能够改善边缘用户吞吐量,同时显著提升系统吞吐量.

Inter-cell interference is serious in LTE co-channeI networks, which becomes the bottleneck of outage performance enhancement in LTE networks. However, inter-cell interference is not considered when applying conventional single-cell scheduling algorithms in LTE uplink. A cooperative scheduling and power allocation scheme based on user clu^tering was proposed in order to mitigate inter-cell interference and enhance system performance, in which users from different cells who share the same resource blocks were clustered. The cooperative scheduling algorithm based on the proportional fair criterion was developed to allocate resourcs among user clusters. The cooperative power allocation was achieved by solving a set of power optimization problems formulated with interference among users in the same user cluster. The simulation result shows that the cooperative scheduling and power allocation scheme based on user clustering is efficient in terms of outage throuvhn,,t hll 1 L