关键词: 异构多网共存, 网络选择, 层次分析, 逼近理想解排序

Abstract:

Combining the needs of electric power business with the performance of special wireless networks, we propose a network selection algorithm for heterogeneous multinetworks coexistence including neighbor networks, LTE special wireless networks, WiMAX special wireless networks and the special wireless networks at 230M frequency. This algorithm is based on the AHPTOPSIS algorithm. We first construct the decision matrix that can indicate the relationship between candidate networks and decision attributes. The normalized decision matrix can be obtained through normalization process. The AHP algorithm is employed to define the individual weight according to the relationship between decision attributes and the network performance under different business types, and then we add weights of normalized decision matrix to obtain the weighted normalized decision matrix. We also make an improvement for the TOPSIS algorithm, determine the plusminus ideal value according to the weighted normalized decision matrix, and use the minimum value between plus ideal value and candidate network, and the maximum value between minus ideal value and candidate network to determine the ideal network. Finally, we calculate the effective distance between each candidate network and ideal network, rank candidate networks and select the best one, which can  avoid anomaly ranking probably existed in the alternative TOPSIS algorithm. Simulation results show that this algorithm can rank candidate networks correctly and select the best network. Meanwhile this algorithm can not only meet the requirement of service QoS, but also improve resource utilization efficiency.

Key words: heterogeneous multinetworks coexistence;network selection;hierarchical analysis;technique for order preference by similarity to an ideal solution (TOPSIS)