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Application-based vertical handoff in heterogeneous wireless networks with QoS guarantee mechanism research

Author: LiZheQin
Tutor: PengJun
School: Central South University
Course: Computer Science and Technology
Keywords: Heterogeneous wireless network Vertical handoff QoS guarantee Handover decision Support Agreement
CLC: TN92
Type: Master's thesis
Year: 2011
Downloads: 84
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Abstract


How to optimize the performance of vertical handover seamlessly switch is heterogeneous wireless network integration important challenges . Papers to ensure application quality of service QoS (Quality of Service) as the target, heterogeneous wireless network vertical handover target network selection and handover signaling flow of execution of these two key issues. Dynamic environment for heterogeneous wireless network interface diversification , application service quality, end position , power and speed and other factors of difference and complexity is proposed based on context-aware vertical handover decision mechanism . Using linear fuzzy membership function will dynamically sensing terminal position, speed, link quality and other environmental information normalized , according to determine whether the power switch , and through speed screening to identify candidate switch networks ; using AHP calculate the decision factor weights to construct synthetic utility evaluation function, conduct evaluation of the effectiveness of the candidate switch networks ; on this basis , in order to maximize the benefits for the target users , white suit elect to switch the target network . And the establishment of knowledge stored perceive environmental information and the corresponding handover decision , so that the terminal can quickly select the target switching networks. To reduce the switching delay and to ensure application quality of service, proposes a QoS-based load balancing vertical handover protocol for seamless vertical handover . First , in order to ensure the application of QoS, by priority the transferred packet is mapped to one of four corresponding queue and queue admission control and bandwidth design borrowing rules to reduce the access point / base station network congestion . Then, the multi-stream multihomed mobile Stream Control Transmission Protocol , the introduction of the media independent handover MIH three service signaling , the switching pre-established target access point link , the use of fast dynamic address reset signaling a new link communication and disconnect the old link , reducing switching delay . Finally, OPNET network simulation tool to switch hit rate , the average number of ping-pong , handoff latency , packet loss rate , signaling overhead and other aspects of performance evaluation, the proposed decision-making mechanism and verify validity of the agreement to switch .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications
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