A novel access selection scheme in heterogeneous wireless environments

作者：Ling, Yutao^*; Yi, Benshun; Wu, Jianbin

来源：International Journal of Advancements in Computing Technology, 2012, 4(1): 24-32.

DOI：10.4156/ijact.vol4.issue1.3

• Access network selections
• Access selection
• All-IP wireless networks
• Handoff dropping probability
• High performance applications
• Next-generation wireless network
• System utilization
• Wireless environment

The next generation wireless network environments are expected to support anywhere, anytime connectivity for high-performance applications. To provide mobile users with seamless wireless access and guaranteed quality of service (QoS), it is a trend to integrate UMTS cellular networks and wireless local area networks (WLANs) into heterogeneous networks in next generation all-IP wireless networks. Access network selection and QoS support for different services are the major challenges in integrated UMTS/WLAN networks. In this paper, we propose a novel access selection method to determine which network is more suitable for a mobile user's service request in heterogeneous UMTS and WLAN networks. This method is utility-based and takes into account QoS requirements of applications, network condition and user mobility. Also it introduces a balancing index in order to reduce the utility value of a network if it is heavily loaded. Consequently, the lower selected probability of the heavily loaded network is obtained. Simulation results demonstrate the improved performance of the proposed access selection scheme as compared with the cost-based scheme. It can reduce new blocking and handoff dropping probabilities, as well as number of handoff. Moreover, this scheme achieves a balance between system utilization and network loading while maintaining QoS requirements. Also larger system throughput is achieved.

• 出版日期2012
• 单位华中师范大学