共查询到17条相似文献,搜索用时 109 毫秒
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一种WLAN的快速切换机制 总被引:1,自引:0,他引:1
WLAN进行子网之间切换时,由于需要IP地址配置,而MIPv6设计时没有考虑这些移动,而造成很大的延迟,不适用于时延敏感业务。本文主要针对这种状况,提出一种应用快速切换的方案。该方案在WLAN中使用快速MIPv6切换机制,在二层切换发生之前配置地址,从而提高WLAN切换的速度,使WLAN切换适用于时延敏感业务。 相似文献
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子网移动性管理的最终目标是移动网络中的所有节点郝可以通过一个永久的IP地址被访问,并且当移动网络的路由器改变接入点时,内部节点仍然可以保持连续的通信。但当前的移动性管理方案由于其基本协议的切换时延较大,丢包率较高而不能适应实时业务和移动通信的要求,需要对移动性管理策略进行改善。文中介绍一种基于SIP和SCTP协议的混合方法Hybrid—NEMO,解决基于MIPv6的NEMO所存在的问题。通过建立相应模型并进行仿真对比分析,该方案能够保证网络移动切换过程中零丢包率和可控制的时延抖动,完全可以实现网络无缝移动的有关性能指标,从而较好地解决了现有移动网络模型实现无缝移动过程中的不足。 相似文献
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基于无线局域网的移动IPv6链路层切换 总被引:1,自引:0,他引:1
随着实时业务(如VOIP)的快速发展,移动IPv6技术的切换过程时延已经不能满足现代通信的需求,因此改进切换时延,提高切换质量很有必要.本文介绍了当一个移动节点(MN)尝试进行基于无线局域网的MIPv6链路层的切换时,利用邻居图算法或邻居缓存机制来减少扫描延迟,从而减少总切换延迟. 相似文献
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《无线电技术与信息》2007,(11):11-15
研究下一代移动IP(MIPv6)在WLAN内的快速切换,IEEE的“Mobil—eIPv6FastHandoversforS02.11Networks”草案提出了一种快速切换的思想,通过链路层传递切换信息对其进行改进,将第三层的切换决策权交给网络(而不是移动节点),实现第二层和第三层的切换并进,从而大大降低了切换时延。该切换算法在OPNET仿真环境下模拟实现。 相似文献
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MIPv6在IP网络层支持移动性,而SIP一直支持VoIP的应用,是IP多媒体子系统(IMS)的信令协议。为了无缝支持在移动领域中的实时多媒体通信,SIP和MIP的集成显得非常重要。本文通过MIPv6、SIP及SIP和MIPv6的集成,显示出SIP和MIPv6的集成对IMS系统性能的优化,说明了该方案可提供有效的路由,并且可减少切换时延。 相似文献
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Yuh‐Shyan Chen Wei‐Han Hsiao Kau‐Lin Chiu 《International Journal of Communication Systems》2009,22(12):1515-1541
In wireless/mobile networks, users freely and frequently change their access points (APs) while they are communicating with other users. To support the mobility of mobile nodes (MNs), Mobile IPv6 (MIPv6) is used to inform the information of MN's home address and current care‐of‐address (CoA) to its home agent. MIPv6 suffers from a long delay latency and high packet losses (PLs) because MIPv6 does not support micromobility. A Hierarchical Mobile IPv6 (HMIPv6) is proposed which provides micromobility and macromobility to reduce handoff latency (HL) by employing a hierarchical network structure. In this paper, we propose a cross‐layer partner‐based fast handoff mechanism based on HMIPv6, called the PHMIPv6 protocol. Our PHMIPv6 protocol is a cross‐layer, layer‐2 + layer‐3, and cooperative approach. A cooperative node, called a partner node (PN), is adopted in the PHMIPv6 protocol. A new layer‐2 trigger scheme used in the PHMIPv6 protocol accurately predicts the next AP and then invites a cooperative PN in the area of the next AP. With the cooperation of the PN, the CoA can be pre‐acquired and duplicate address detection operation can be pre‐executed by the PN before the MN initializes the handoff request. The PHMIPv6 protocol significantly reduces the handoff delay time and PLs. In the mathematical analysis, we verified that our PHMIPv6 protocol offers a better HL than the MIPv6, HMIPv6, and SHMIPv6 protocols. Finally, the experimental results also illustrate that the PHMIPv6 protocol actually achieves performance improvements in the handoff delay time, PL rate, and handoff delay jitter. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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The mobility solution provided by Mobile IPv6 (MIPv6) imposes too much signaling load to the network and enforces large handoff latency to end user. Hierarchical MIPv6 (HMIPv6) on the other hand, is designed by organizing MIPv6 in layered architecture and performs better than MIPv6 in terms of handoff latency and signaling load. Observation shows that, there is still possibility to shrink the handoff latency and the signaling load by further extending HMIPv6 into multiple layers. To explore this possibility of enhanced performance through layered architecture, this paper aimed at mathematical exploration of an N-layered MIPv6 network architecture in order to figure out the optimal levels of hierarchy for mobility management. A widespread analysis is carried out on various parameters such as location update frequency and cost, handoff latency and packet delivery cost. Influence of queuing delay on handoff latency is examined by modeling M/M/1/K queue in the architecture and user mobility is modeled using Markov chain. Analytical investigation reveals that three levels of hierarchy in MIPv6 architecture provide an optimal solution for mobility management. 相似文献
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Zohar Naor 《Ad hoc Networks》2013,11(7):2136-2145
A layer-3 mobility management scheme for an all-IP Wireless Access Network (WAN), and in particular for vehicular networks, is developed in this paper. The proposed method enables fast and reliable handoff. This feature is extremely important for high speed vehicular networks. Since vehicles are characterized by likely-predictable path, as well as very high speed, handoff events can and should be predicted in order to achieve fast and reliable handoff. As it is shown in this study, the proposed scheme can significantly reduce the packet loss ratio caused by frequent handoff events experienced by high speed vehicles. This scheme is topology-independent in the sense that it does not assume any network topology. The key idea is to use a topology-learning algorithm that enables to perform localized mobility management, by efficiently re-selecting a Mobility Anchor Point (MAP) node. The goal of the proposed scheme is to maintain a continues connection subject to user-dependent delay constraints, while minimizing the signaling cost and packet loss ratio associated with handoff events. This scheme is consistent with the existing mobility management schemes currently used in Mobile IP (MIP) and cellular networks, and it fits into the Hierarchical Mobile IPv6 (HMIPv6) scheme defined in Mobile IPv6 (MIPv6) for integrating mobile terminals with the Internet wired backbone. 相似文献
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There has been a rapid growth in the need to support mobile nodes in IPv6-based networks. IETF has completed to standardize
Mobile IPv6 (MIPv6) and Hierarchical Mobile IPv6 (HMIPv6) for supporting IPv6 mobility. Even though existing literatures have
asserted that HMIPv6 generally improves MIPv6 in terms of handover speed, they do not carefully consider the details of the
whole handover procedures. In this paper, based on the current IETF standards of both MIPv6 and HMIPv6, we conduct a comprehensive
study of all IP-level handover procedures: movement detection, duplicate address detection, and location registration. Based
on this study, we provide a mathematical analysis on MIPv6 and HMIPv6 performance in terms of handover speed. From the analysis,
we reveal that the average HMIPv6 handover latency is not always lower than the average MIPv6 handover latency. Furthermore,
even the intra-domain handover latency of HMIPv6 is not reduced much compared with MIPv6 handover latency. A finding of our
analysis is that optimization techniques for movement detection and duplicate address detection are essential to shortening
HMIPv6 handover latency and increasing the benefit of HMIPv6.
相似文献
Sung-Gi MinEmail: |
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Hayoung Oh Kibaek Yoo Jongkeun Na Chong-kwon Kim 《Wireless Personal Communications》2010,52(3):593-613
With the rapid development of wireless technologies and numerous types of mobile devices, the need to support seamless multimedia
services in Mobile and Ubiquitous Computing (MUC) is growing. To support the seamless handover, several mobility protocols
such as Mobile IPv6 (MIPv6) (Johnson et al., Mobility Support in IPv6, IETF, RFC 3775, 2004) and fast handover for the MIPv6
(FMIPv6) (Koodli et al. Past handovers for mobile IPv6 (FMIPv6), IETF, RFC 4068, 2005) were developed. However, MIPv6 depreciates
the Quality-of-Service (QoS) especially in multimedia service applications because of the long handover latency and packet
loss problem. To solve these problems in the MIPv6, FMIPv6 is proposed in the Internet Engineering Task Force (IETF). However,
FMIPv6 is not robust for the multimedia services in heterogeneous emerging wireless networks when the MN may move to another
visited network in contrast with its anticipation. In MUC, the possibility of service failure is more increased because mobile
users can frequently change the access networks according to their mobility in heterogeneous wireless access networks such
as 3Generation (3G), Wireless Fidelity (Wi-Fi), Worldwide Interoperability for Microwave Access (WiMax) and Bluetooth co-existed.
In this paper, we propose a robust seamless handover scheme for the multimedia services in heterogeneous emerging wireless
networks. The proposed scheme reduces the handover latency and handover initiation time when handover may fail through the
management of tentative Care-of Addresses (CoAs) that does not require Duplicate Address Detection (DAD). Through performance
evaluation, we show that our scheme provides more robust handover mechanism than other scheme such as FMIPv6 for the multimedia
services in heterogeneous emerging wireless networks. 相似文献