| 支持无线局域网实时业务传输的蜂窝IP协议 |
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| 引用本文： | 宋永华 刘岚 姚文冰. 支持无线局域网实时业务传输的蜂窝IP协议[J]. 北京邮电大学学报, 2005, 28(5): 4-10 |
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| 作者姓名： | 宋永华 刘岚 姚文冰 |
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| 作者单位： | Brunel大学 电子与计算机工程系， 伦敦 UB8 3PH |
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| 摘 要： | 首先分析在分别使用间接越区切换机制下恒比特率业务的延迟，分析结果显示这种机制均不能保证在越区切换时的零丢包率. 路由更新过慢以及接入新基站时间过长是造成潜在丢包率的主要原因. 为减少这2种因素的影响，提出了加强型间接切换机制，其中主要提出简单路由更新和越区切换缓存2种方案以改善原来的蜂窝协议. 通过对加强型间接切换机制的理论分析和利用NS2进行仿真所得出的结果均显示，在加强型间接切换机制中，实时业务在越区切换期间的丢包率大大降低.
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| 关 键 词： | 蜂窝IP IEEE 802.11 越区切换 性能分析 |
| 文章编号： | 1007-5321（2005）05-0004-07 |
| 收稿时间： | 2005-06-13 |
| 修稿时间： | 2005-06-13 |
Enhancing Cellular IP Protocol to Support Real-Time Services over Wireless LAN |
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| SONG Yong-hua, LIU Lan, YAO Wen-bing. Enhancing Cellular IP Protocol to Support Real-Time Services over Wireless LAN[J]. Journal of Beijing University of Posts and Telecommunications, 2005, 28(5): 4-10 |
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| Authors: | SONG Yong-hua LIU Lan YAO Wen-bing |
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| Affiliation: | Department of Electronic and Computer Engineering, Brunel University, London UB8 3PH, United Kingdom |
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| Abstract: | The delay performance of the indirect handoff scheme(IHS) experienced by constant-bit-rate(CBR) traffic was analyzed first,and the result shows this scheme in cellular IP(CIP) protocol cannot guarantee zero packet loss during the handoff process.Slow route updating and long access time to the new base station(BS) are the two main reasons leading to the potential packet loss.In order to mitigate the influence of these two problems,an enhanced indirect handoff scheme(EIHS) was proposed.Simplified routing updating(SRU) and handoff buffering(HBUF) were adopted to improve the IHS in the CIP.The results of the theoretical analysis and NS-2 simulation show that packet loss of the real-time traffic during the handoff can be reduced dramatically with the EIHS. |
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| Keywords: | IEEE 802.11 |
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