移动IP的寻呼扩展技术

介绍了一种简单易行的移动IP的扩展方案,它通过对基本的移动IP协议进行简单的扩展,使其支持寻呼功能,减少大量的信令开销,使MIP能够支持大量移动用户。     

移动IPv6网络中的切换策略研究

在未来基于IPv6技术的宽带移动网络中,移动主机的IP层切换策略是保证实时业务服务质量的关键问题之一。论文首先分析和比较了在Internet工程任务组(IETF)中三个主要的移动IPv6网络中的切换策略,在此基础上深入研究了将快速切换协议应用于分级移动IPv6网络的方案,并对此进行了仿真。仿真结果表明,该方案可以提高移动用户IP层切换的性能,能改善实时业务的服务质量。     

移动IP网络中基于遗传算法的多步寻呼策略及性能分析

在移动IP网络中,层次移动IP协议可降低移动IP位置管理的信令消耗。该文研究支持寻呼的HMIPv6,提出了时延限制下的多步寻呼策略以及基于遗传算法的多步寻呼方案——根据移动节点的位置概率分布,采用遗传算法对寻呼区域内的所有子网进行分组,每步寻呼一个组,使平均寻呼信令开销达到或接近最优。此外,对HMIPv6、单步寻呼的HMIPv6以及基于遗传算法的多步HMIPv6寻呼方案的信令开销进行了比较分析,得出寻呼节省信令开销的必要条件。最后,给出一组数值结果以说明所提出的寻呼策略的有效性。     

基于树状MAP的移动IPv6无缝实时切换策略研究

提出了一种移动IPv6切换策略,基于分级移动IPv6和快速移动IPv6构造树状MAP框架,设计逐跳绑定更新机制对快速移动IPv6进行改进,实现移动节点的无缝(快速平滑)切换。同时,根据资源预留协议扩展策略功能,提出提前预留方式,增强对实时数据流的支持能力。     

移动互联网的关键技术——IPv6

移动互联网是因特网发展的一种趋势。IPv4已不能满足互联网发展的需要，而新一代的IPv6为移动互联网提供了故障。本在分析了移动IP的基本原理后，具体论述了IPv6对移动性的支持。并通过与IPv4的比较，突出IPv6的特点和优势。     

基于DAD的HMIPv6切换技术改进

在移动IPv6,尤其是层次化移动IPv6中,地址重复检测严重影响了移动节点的切换,该过程不仅浪费了时间,也增加了因特网的信令负载。本文提出了一个新的重复地址检测机制,在接入路由器和移动锚点中建立重复地址检测表,记录该区域中所有的IPv6地址,当需要进行IPv6地址检测时,只需在这些重复地址检测表中进行搜索来证实地址的唯一性。这种新方法能快速重复地址检测,缩短了重复地址检测时间。     

HMIPv6协议中提高移动业务QoS的策略分析

提出了在HMIPv6中将转交地址池策略与简化资源预留协议策略相结合的改进策略。通过对标准HMIPv6改进前后所产生的切换时延对比分析,得出了有关的重要结论。     

一个基于IPv6移动管理结构的研究

移动IPv6被认为是实现固定和移动网络结合的关键技术,它可以实现固定和移动网络的无缝连接。在移动网络中,要求数据能被快速移交,但是这个核心功能在早期的移动IPv6的版本不能得到支持。这是由于移动节点的移动性能的管理受制于家乡代理和通信伙伴节点,而且后两者往往远离移动节点。为了克服这个问题,IETF提出了分级处理的办法,但这些方法是牺牲路由优化来获取数据的快速移交。本文提出一种新的基于分级处理的移动管理结构,它可以实现在不牺牲路由的前提下,加快数据信息的快速移交。     

移动互联网的关键技术──IPv6

移动互联网是因特网发展的一种趋势。IPv4已不能满足互联网发展的需要,而新一代的IPv6为移动互联网提供了保障。本文在分析了移动IP的基本原理后,具体论述了IPv6对移动性的支持,并通过与IPv4的比较,突出IPv6的特点和优势。     

IPv6扩展首部的使用

扩展首部和选项是IPv6的改进之处，它减少了一般情况下首部占用的带宽和包处理的开销。在必要时才用扩展首部和选项，既减少了开销又能满足特殊业务的要求。本简要叙述了IPv6的扩展首部和选项在IPv6包中的位置和模式及使用方法。     

一种用于分层移动IPv6的MAP选择方案

介绍了一种基于移动节点(MN)的移动速度和移动锚点(MAP:Mobility Anchor Point)管理半径的负载计算方法。MAP能根据计算出的负载动态地调整自己的优先级。此外,MN可以用多属性决策选择合适的MAP来注册。通过验证,该方案能够很好地处理MAP过载的问题,从而提高通信质量。     

Associative IP paging based on hierarchical mobile IPv6

IP paging is a well‐known topic, which focuses on reducing amount of binding update (BU). Various IP paging architectures rely on multicast/broadcast to send their messages in wireless network. However, multicast/broadcast is unreliable and has limited bandwidth in power saving mode. This paper uses unicast to avoid exhaustion of the limited bandwidth and reliably page mobile nodes (MNs) by layer 2's supporting acknowledgment in nature. Furthermore, we successfully suppress the amount of BU by remembering and checking MNs' ever attached on‐link care of addresses (LCoAs) in the stack, which is maintained by least recently used (LRU) algorithm for efficiently paging while MNs moving in a localized pattern. We simulate this mechanism to obtain the optimal stack size, which can dramatically reduce the signals of location update and paging. Copyright © 2009 John Wiley & Sons, Ltd.     

Low-cost binding update scheme based on pointer forwarding in HMIPv6 network

By introducing a mobility anchor point(MAP),hierarchical mobile IPv6(HMIPv6)reduces the binding update signaling cost associated with mobile IPv6,but there still exist deficiencies.For instance,a mobile node(MN)needs to orderly accomplish two binding updates with the MAP and home agent(HA)when the MN performs inter-MAP mobility.This results in a high signaling cost,thus affecting network performance.To reduce the inter-MAP binding update cost of idle MN in HMIPv6,an optimization scheme based on pointer forwarding with a threshold is proposed.The scheme can reduces the binding update cost of idle MN by using the binding update between MAP to replace several home binding updates.The signaling cost difference is derived by analyzing the cost of the basic scheme and the optimization scheme between two successive sessions.Simulation results show that,the optimization scheme can reduce the binding update signaling cost and improve the network performance as long as a suitable threshold is chosen.The discussions on the sensitivity of tele-parameters are also given.     

A wireless access network based on WDM-PON for HMIPv6 mobility support

In this paper, an IP-based wireless access network is proposed, which is designed to support the hierarchical MIPv6 standard on the wavelength division multiplexed passive optical network access network in order to provide a fast and seamless handoff support. Two schemes for enhancing the mobility management are included in the proposed network’s infrastructure support. Firstly, the local-link channels between sub-networks are provided to improve the mobility management efficiency for the mobile nodes roaming between neighboring sub-networks. Secondly, the early route optimization scheme has been applied, which optimizes the mobility management process between the corresponding node and the home agent (HA), resulting in reduced bandwidth waste and long end-to-end packet delays, as well as lowering the heavy burden on the HA. The performance of the proposed mobility management scheme has been evaluated in terms of handoff delays, packet losses and transmission costs. The superior performance of the proposed scheme has been verified and compared to other schemes.     

Active overload prevention based adaptive MAP selection in HMIPv6 networks

Multi-level mobile anchor points (MAP) architecture is deployed in large-scale wireless/mobile networks using HMIPv6 to achieve better mobility service, while selecting the most suitable serving MAP for the mobile nodes (MNs) to enhance the whole network performance has been a critical issue. An adaptive MAP selection based on active overload prevention (MAP-AOP) hence is proposed. The MAP periodically evaluates the load status by using dynamic weighted load evaluation algorithm, and then sends the load information to the covered access routers (AR) by using the expanded routing advertisement message in a dynamic manner. Taking achieving the load balancing among the available MAPs, the current serving AR executes the active overload prevention to select MAP candidates for the MN pending a handover, and then adaptively selects an optimal one from the candidates by comprehensively considering the system cost and the average handover latency caused by each candidate. The simulation conducted on the NS-2 platform indicates that MAP-AOP outperforms the comparative MAP selection schemes with the optimized system cost and average handover latency, and better load balancing.     

Dynamic multi-step paging scheme in PMIPv6-based wireless networks

In Proxy Mobile IP (PMIPv6) networks, proxy-registrations are performed even for idle MNs, resulting in unnecessary signaling traffic. Although there have been many IP paging techniques aimed at reducing the unnecessary location update, they focus only on Mobile IP (MIP) since they had been developed before PMIPv6 was proposed. Thus, adopting existing IP paging support is not sufficient to support mobility in PMIPv6 networks. For more efficient support, we propose a dynamic multi-step paging scheme that pages an MN in multiple incremental steps instead of flooding paging messages to a whole paging area to significantly reduce the signaling traffic caused by the proxy location updates in the PMIPv6 networks. In addition, to improve the paging delay performance that may be deteriorated by the multi-step paging, the proposed scheme configures paging area dynamically to raise the efficiency of locating MNs. The size of a paging area is designed to be determined based on the speed of an MN. We also develop a thorough analytical model for evaluating the performance of the proposed scheme compared with a static paging scheme in terms of the signaling cost and the paging delay. Thorough analysis and simulation demonstrate that in the PMIPv6 network, our paging scheme can significantly reduce the signaling cost for IP paging, achieving a shorter paging delay, compared to that of a paging scheme with a fixed paging area.     

Sequential paging schemes considering two classes of paging traffic

Three sequential paging methods for serving two classes of paging traffic are considered. The first method involves treating the two classes of traffic equally, the second involves giving higher priority to call paging traffic over supplementary service traffic and the final method involves using different paging area sizes for each class of traffic     

集成AAA的HMIPv6认证与注册方案

在下一代互联网中,需要使用AAA保证网络安全和网络资源合理使用,但是AAA与移动IPv6的结合,对切换性能及网络安全带来影响,而切换与安全是移动环境的关键问题。论文提出了新的解决方案,将HMIPv6与AAA结合,实现认证与注册过程的统一及本地认证,提高切换性能,并在注册与认证的过程中对消息进行加密,保证传输的安全。分析表明,本方案实现了AAA机制与移动管理机制安全高效的融合。