基于可用数据速率的3G与无线局域网垂直切换触发机制

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文章编号:10019081(2013)07182503

doi:10.11772/j.issn.10019081.2013.07.1825

摘 要:

针对传统垂直切换触发机制存在不能保证实时提供最高可用数据速率的问题，提出一种更充分利用网络资源并且能够有效避免不必要切换的方法。引入IEEE 802.21介质独立切换（MIH）标准，利用MIH提供的介质独立信息服务（MIIS）获取能够覆盖到移动终端的候选无线局域网（WLAN）的相关参数，通过获取的相关参数计算其最大可用数据速率，将候选WLAN的可用数据速率与3g网络对比，做出切换决策：当检测到数据速率更高的WLAN时，能够及时地切换到该WLAN；若移动终端移动出WLAN覆盖范围则切换回3G网络。仿真实验表明相比传统垂直切换触发机制，该方案对网络资源的利用更充分，并且能够有效避免不必要的切换。

关键字： 异构无线网络；垂直切换；触发机制；介质独立切换；可用数据速率估计

中图分类号: TN92文献标志码:A

英文标题

Vertical handover trigger mechanism between 3G and WLAN based on available data rate

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英文作者名

ZHANG Jinfu, YUAN Ling*, YOU Jianqiang

英文地址(

College of Information Engineering, Guangdong University of Technology, Guangzhou Guangdong 510006, China英文摘要)

Abstract:

For the issue that traditional vertical handover trigger mechanism cannot guarantee to provide the realtime highest data rate, a method which can make the best of network resources and can effectively avoid unnecessary handover was proposed. This paper introduced IEEE802.21 Media Independent Handover (MIH) standard，using Media Independent Information Service (MIIS) provided by MIH Function (MIHF) to get the parameters of candidate Wireless LAN (WLAN) which can cover the mobile terminal, calculate the maximum available data rate of the candidate WLAN using the acquired parameters, and compare the maximum available data rate of WLAN with 3G networks to make handover decision. And when higher data rate WLAN was detected, handover to it could be made timely. If the mobile terminal moved out of the WLAN coverage, handover back to 3G network was made. The simulation results show that the proposed algorithm can make more full use of network resources and avoid unnecessary handover effectively compared to traditional vertical handoff trigger mechanism.

For the issue that traditional vertical handover trigger mechanism can not guarantee to provide the real-time highest data rate, a method which can make the best of network resources and can effectively avoid unnecessary handover was proposed. This paper introduced IEEE802.21 Media Independent Handover (MIH) standard，using Media Independent Information Service (MIIS) provided by MIH Function (MIHF) to get the parameters of candidate Wireless LAN (WLAN) which can cover the mobile terminal, calculate the maximum available data rate of the candidate WLAN using the acquired parameters; Compare the maximum available data rate of WLAN with 3G network’s to make handover decision. And when higher data rate WLAN is detected, handover to it timely; If the mobile terminal moves out of the WLAN coverage, handover back to 3G networks. The simulation results show that the proposed algorithm can make more fully use of network resources and avoid unnecessary handover effectively compared to traditional vertical handoff trigger mechanism.

英文关键词Key words：

heterogeneous wireless network; vertical handover; trigger mechanism; Media Independent Handover (MIH); available data rate estimation

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