异构网络中多网络并行传输的网络选择算法

为了充分利用异构网络中的无线资源，提出了一种基于多网络并行传输的异构网络接入选择算法，该算法根据终端接收信号功率确定能够进行通信的无线网络，以这些无线网络的任意非空子集作为候选方案，计算各个方案对应的聚合属性，再根据吞吐量和功耗阈值条件限定候选网络方案，对这些方案建立多属性决策矩阵，采用基于用户偏好的逼近理想值排序法(TOPSIS)得到各个候选网络方案的效用函数值，从中选出与理想方案最接近的多网络接入方案。仿真结果表明该算法能有效改善用户服务质量，提高用户吞吐量，降低用户的单位吞吐量对应的功耗和费用，保证网络的负载均衡。 

Network Selection Algorithm based on Multi-radio Parallel Transmission for Heterogeneous Wireless Networks

To make full use of radio resources in heterogeneous wireless networks, a network access selection algorithm based on multi-radio parallel transmission is proposed. The algorithm firstly determines all available wireless networks according to received signal power from base stations, and considers every subset of these networks as a network selection scheme. Then we calculate the aggregation attribute of every scheme to confirm the candidate network schemes which are limited by the throughput and power consumption threshold. The matrix of multiple attribute decision making is built and the optimal scheme to access is determined based on cost function value of every network scheme by using TOPSIS algorithm with user preference. The distance between the optimal scheme and the ideal scheme is the nearest. The simulation results show that the proposed algorithm can obviously improve user quality of service, improve user throughput, reduce power consumption per bit and price cost per bit, and keep network load balanced.