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地铁环境中双网卡软切换机制的研究与应用

Research and Application of Dual-NIC Soft Handoff Scheme in Subway Wireless System
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摘要 高速移动的无线节点在接入点间切换时,切换延迟较大、丢包率较高.在单网卡切换环境中,不可避免地存在网络中断的现象.该文结合地铁无线通信环境对切换延迟和丢包问题进行研究,为移动节点配备两块无线网卡,控制两块网卡协同工作,共同完成无线切换和数据传输.测试结果表明,双网卡软切换机制无需修改网络层及上层协议栈,在特定环境中可以实现低延迟和零丢包.该切换机制已经在地铁信号系统国产化预研项目中得到应用. Mobile Mode performs a handoff whenever it moves out of the range of one access point and tries to connect to another one. The delay and losing packets caused by handoff process affect the network QoS. Taking subway wireless communication system as an application scenario, MN was settled double wireless NICs, which are controlled work together to complete data transmission and handoff. The result shows that this scheme can decrease the scan delay effectively, and the packet loss rate can reduced to zero in specific environment, and the extra delay to the network is tolerable. This handoff scheme has been applied to the pre-research project of subway signal systems.
作者 赵立芳 陈兵
机构地区 南京航空航天大学信息科学与技术学院
出处 《小型微型计算机系统》 CSCD 北大核心 2011年第3期489-492,共4页 Journal of Chinese Computer Systems
基金 导弹控制系统国家重点实验室基金项目(9140C60040307HT08)资助
关键词 无线局域网 切换 延迟 丢包率 WLAN handoff delay packet loss rate
分类号 TP393 [自动化与计算机技术—计算机应用技术]
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参考文献12

  • 1Chen Yuh-shyan, Chuang Ming-chin, Chen Chung-kai. DeuceScan: deuce-based fast handoff scheme in IEEE 802.11 wireless network[ J]. IEEE Transaction on Vehicular Technology, 2008, 57 (.2): 1126- 1140.
  • 2Mustafa Noor, Mahmood Waqar, Chaudhry Ahsan, et al. Pre-Scanning and dynamic caching for fast handoff at MAC layer in IEEE 802. 11 wireless LANs[C]. Mobile Adhoc and Sensor Systems, Washington, USA, 2005, 114-122.
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  • 8Sun Hung-min, Lin Yue-hsun, Chen Shuai-min,et al. Seeure and fast handover scheme based on pre-authentication method for 802. 16/WiMAX infrastructure networks[ C]. TENCON 2007-2007 IEEE. Region10 Conference, Taipei, Taiwan, 2007, 1-4.
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小型微型计算机系统
2011年 第3期

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