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Study on Vertical Handover Algorithm with Handover Prediction Mechanism in Wireless Heterogonous Networks

Author: XuShiPing
Tutor: ShiWenXiao
School: Jilin University
Course: Communication and Information System
Keywords: Wireless heterogeneous networks Vertical handover Pre-shift Grey multi - objective decision making Load balancing
CLC: TN929.5
Type: Master's thesis
Year: 2011
Downloads: 154
Quote: 1
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Abstract

The communication rapid development of technology, a few decades has undergone a transition from the analog communication system to the digital communication system, and then to a third generation communication system capable of carrying multimedia services. The communication network has a variety of communications technologies, access technologies coexist situation, which is destined to a future wireless communication systems must be a full-IP core network, the coexistence of multiple access technologies for heterogeneous wireless networks. Therefore, how to be able to reliably and efficiently provide mobile users with different network seamless roaming service between different cells became key research in the next generation network. Through the reading of the extensive literature of heterogeneous wireless network vertical handover strategy study did not consider the complexity of the switching mechanism switching the best time. To solve this problem, we join the pre-switching mechanism in heterogeneous wireless network vertical handover strategy. First, according to the moving speed of the user and the real-time nature of the business conducted pre judgment, to obtain the best changeover timing to reduce the number of handover failure; Second, when switching the mobile station according to the collected network signal quality, load conditions, type of business, the user moving speed, and user preferences and other data to the network, the use of gray multi-attribute analysis of the production of the target cell list, to quickly and accurately find the right target cell, the last unit switching area waiting queue, and queue length switching. Vertical handoff algorithm in heterogeneous wireless networks to join the pre-switching mechanism, a pre-switching mechanism of heterogeneous wireless network vertical handover algorithm. The algorithm uses a fluid model user mobile characteristics, heterogeneous wireless network abstraction into a gray space, vertical handover is abstracted into a multi-attribute decision problems, gray multi-attribute decision method takes into account the network load, network latency, network quality, business QoS, and user preferences and other factors, the handover decision. Join the pre-shift mechanism at the same time, the algorithm in each switch area set queuing queue, in order to discriminate between real-time and non-real-time business, and strive to the rational application of network resources. The advantage of this algorithm, one can reasonably allocate network load and lower switching rate of dropped calls, considering the network side and user side, allowing users to more quickly find the right target network switching. Simulation results show that the pre-switching mechanism can effectively protect the high-speed real-time business handover success rate; network load balancing as one of the parameters to select the network effectively balance network load; reasonable queue mechanism can also reduce the non-real-time business Switch failure rate.

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