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| 层次移动IPv6中基于阈值的自适应呼叫准入控制 |
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王胜灵1, 侯义斌2, 黄建辉1, 黄樟钦2
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1.西安交通大学,电子与信息工程学院,陕西,西安,710049;2.北京工业大学,嵌入式软件与系统研究所,北京,100022
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| 摘要: |
| 提出了一种适用于层次移动IPv6(HMIPv6)网络的呼叫准入控制(call admission control,简称CAC)方案.该方案以过载率和系统容量为限制,根据网络中主机的移动特性和呼叫特性,自适应地计算出区域中各小区的理想呼叫数,使系统效益最大化.通过建立HMIPv6网络下的Markov模型,计算出达到理想呼叫数的CAC阈值,并将其作为是否接纳新呼叫的判断依据.仿真实验分析了影响最优区域范围的因素,为设计动态微移动管理方案提供了依据.它指出:随着呼叫在小区之间的切换率和平均持续时间的增加,最优区 |
| 关键词: 层次移动IPv6 呼叫准入控制 Markov模型 过载率 |
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| 基金项目:Supported by the National Natural Science Foundation of China under Grant No.90407017 (国家自然科学基金); the Key Project Foundation of Technology and Development Program of Beijing Municipal Commission of Education under Grant No.KE2005100005006 (北京市教育委员会科技发展计划重点项目基金) |
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| Threshold-Based Adaptive Call Admission Control in Hierarchical Mobile IPv6 |
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WANG Sheng-Ling,HOU Yi-Bin,HUANG Jian-Hui,HUANG Zhang-Qin
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| Abstract: |
| A call admission control (CAC) scheme used in hierarchical mobile IPv6 (HMIPv6) network is proposed, which solves the ideal call number of each cell adaptively to maximize system’s profits, under the restriction of system’s overload probability and capacity and in terms of hosts’ mobility characteristics and call characteristics. The CAC threshold of each cell used in making decisions of accepting or rejecting a new call by network is solved by establishing a Markov model in HMIPv6 network, which can make system’s call number up to the ideal value. Simulation analyzes the factors affecting the optimal regional size, providing a reference for designing a dynamic regional mobility management scheme. The simulation analyses reveal that with the increase of calls’ handoff probability and average duration time, the optimal regional size increases while the regional ideal call number decreases; and with the restriction of overload probability relaxes, the new call blocking probability (CBP) comes down while the handoff dropping probability (HDP) goes up. Finally, a performance comparison result between the proposed scheme and the mobile IP reservation (MIR) scheme demonstrates that the average values of CBP and HDP in the proposed scheme are lower than those in MIR during 2000 simulation intervals, which means the optimization is realized. |
| Key words: hierarchical mobile IPv6 call admission control Markov model overload probability |
