Abstract
In 802.11 wireless networks, a complete handoff procedure for a mobile node requires access point (AP) selection, AP switch, call admission control (CAC), IP address re-allocation, and network re-configuration. Most current handoff schemes deal only with either AP selection or IP address re-allocation. In this paper, an integrated handoff procedure is proposed. First, AP selection is accomplished by choosing an AP with the lowest channel utilization and smaller number of associated users. The information about load of each AP is reported through modified beacon frames. In the case of adopting load-based AP selection, the average throughput can be increased up to 56%, as opposed to pure SNR-based AP selection. Next, both CAC and IP address pre-fetch are performed simultaneously through the simplified DHCP procedure. Specifically, efficient limited fractional guard channel policy (ELFGCP) is proposed for the CAC phase. By adopting ELFGCP, the failure probability can be reduced as much as 45% from conventional LFGCP. Finally, the simulation results demonstrate the applicability of the integrated approach, and the overall disconnection time due to handoff can be reduced from 2.9 to 0.004 s using traditional handoff procedures.
Highlights
With the rapid growth of the deployment of WiFi [1] devices, mobile users can access Internet resources
We found when there are more of new calls, efficient limited fractional guard channel policy (ELFGCP) performs much better in the failure probability than what FLGCP does
To speed up the handoff process in wireless networks, we present a re-organized scheme of access point (AP) selection phase, call admission control (CAC) phase, and IP address re-allocation phase
Summary
With the rapid growth of the deployment of WiFi [1] devices, mobile users can access Internet resources. These phases are activated only after the mobile node (MN) has disconnected from its associated AP. The expanded 95% confidence interval of overall throughput of the proposed scheme reflects that the unstable transmission, which is resulted in the MNs associates with the AP according to the channel utilization and user count instead of the SNR. As the smaller probability of failure, either dropping or blocking indicates that more users can access the services, we investigate the failure probability of the proposed CAC algorithm under various new calls to handoff calls ratios in the following simulation. The handoff durations for both disconnect events, from G1 to G2 and from G2 to G3, are effectively reduced to about 0.004 s, in contrast to more than 2.9 s using traditional handoff
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: EURASIP Journal on Wireless Communications and Networking
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
