基于射频能量收集的异构网络资源分配策略

Resource allocation strategy based on RF energy harvesting in heterogeneous networks

针对异构网络中微微基站出现过多用户的情况,研究最大化上行总吞吐量的资源分配问题。通过部署一个具有能量收集功能的中继节点,将微微基站部分用户转移到相邻的空闲微微基站。中继节点具有能量收集功能,可以从专用射频源和环境射频源收集能量。将资源分配问题建模为最优化问题,以最大化微微基站用户的上行总吞吐量为目标,同时满足用户最小数据速率、中继节点能量消耗和发射功率的约束条件。通过引入增广拉格朗日乘子法,获得最优解。仿真结果表明,与传统的将部分微微基站用户转移到宏基站的方法相比,提出的方法具有较大的吞吐量提升。此外,与同样采用中继节点进行辅助通信的等功率方法相比,提出的方法在吞吐量方面有一定程度的增加。

Aiming at the situation where too mary users appear in a pico base station(PBS)of heterogeneous networks,the resource allocation problem of maximizing the total uplink throughput is investigated in this paper.By deploying a relay node with energy harvesting,some users of the PBS are transferred to the adjacent idle PBS.The relay node has an energy harvesting function.It can harvest energy from a dedicated RF source and ambient RF sources.The resource allocation problem is formulated as an optimization problem.The objective is to maximize the total uplink throughput of users in the PBS under the constraints of the user’s minimum data rate,the energy consumption,and transmission power of the relay node.The optimal solution is obtained by using the augmented Lagrange multiplier method.Simulation results show that the proposed method has higher throughput compared with the traditional method(i.e.,some PBS users are transferred to the macro base station).Moreover,compared with the equal power method of relay node-assisted communication,the proposed method has an increase in terms of throughput to a certain degree.