基于准入预测的异构系统网络选择算法

his paper presents the combination of distributed network selection and call admission control (CAC) in heterogeneous wireless network (HWN). The HWN is constituted with two soft capacity radio systems, which are CDMA based radio system and OFDMA based radio system. Based on system load estimation using resource allocation information included in system broadcasting message, we present a method of estimating receiving power of CDMA system and transmitting power of OFDMA system. Using the result of system load estimation, we present a distributed CAC estimation scheme based on power threshold and a distributed network selection scheme based on user transmitting power. With the association of CAC estimation, the distributed network selection scheme can give a better decision of network access. From the simulation results, we come to the conclusion: with the association of system load estimation and CAC estimation, distributed network selection can have high radio resource efficiency without affecting user’s application requirement and have high system throughput close to the centralized CAC scheme.