Interworking of Wireless LANs and Cellular Networks
Springer Science & Business Media, Jun 30, 2012 - Technology & Engineering - 67 pages
The next-generation of wireless communications are envisioned to be supported by heterogeneous networks by using various wireless access technologies. The popular cellular networks and wireless local area networks (WLANs) present perfectly complementary characteristics in terms of service capacity, mobility support, and quality-of-service (QoS) provisioning. The cellular/WLAN interworking is an effective way to promote the evolution of wireless networks. Interworking of Wireless LANs and Cellular Networks focuses on three aspects, namely access selection, call admission control and load sharing to investigate heterogeneous interworking for cellular/WLAN integrated networks. It not only reveals important observations but also offers useful tools for performance evaluation. The unique traffic and network characteristics are exploited to enhance interworking effectiveness. Theoretical analysis and simulation validation demonstrate benefits of cellular/WLAN interworking in real networks. Last but not the least, this brief highlights promising future research directions to guide interested readers.
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acceptable data traffic admission parameters admission regions algorithm Analysis blocking and dropping call admission control call arrival rate call blocking probability call size threshold calls in WLAN cell and WLAN cell bandwidth cellular network cellular-only area cellular/WLAN integrated network cellular/WLAN interworking coverage data call arrival data call blocking data call size Data call variability data calls admitted data size threshold data traffic load double-coverage area dropping probabilities exponentially distributed guard channel policy heavy-tailed distributions hyper-exponential distribution interworking schemes kbit larger load sharing scheme Markov processes maximum number mean data call mean data transfer mean transfer Mobility variability parameter network and WLANs number of data number of voice performance Poisson process QoS evaluation QoS metrics resource utilization respectively simulation results size-based load sharing SRPT transfer time Td user mobility user residence vertical handoff voice and data voice calls allowed voice traffic load Weibull distribution Weibull factor Wireless LANs WLAN capacity