关键词: 无线异构网络, 能量收集, 移动台关联, 基站, 中继站

Abstract: In wireless Energy Harvesting（EH） cellular networks, a heterogeneous network model is established which consists of a macro base station, several small base stations, several relay stations, and a few mobile stations in the flat Rayleigh fading environments. All of stations are only powered by the energy harvested in the surrounding wireless environments. Based on this model, a novel Mobile Association algorithm based on the Weighted Signal-to-Noise Ratio decision（WSNR-MA）, is proposed. In WSNR-MA algorithm, the mobile station can not only associate the macro base station and small base stations through the direct communication links, but also can associate the macro base station through the relay links. The association decision depends on both the channel state information and the weighted signal-to-noise ratio threshold defined by the product of a weight function and a signal-to-noise ratio threshold. Expressions of the outage probability of system and average channel capacity have been derived in succession. The simulation results show that the WSNR-MA algorithm is flexible in balancing the traffic load among multiple types of stations, and can achieve a larger system channel capacity and better outage performance than the existing methods, which has positive significance.

Key words: wireless heterogeneous network, Energy Harvesting（EH）, mobile association, base station, relay station