一种基于分层MAP的MIP切换方案

移动IP是解决无线网络融合的较好方案,但是移动IP切换时延较大,需要改进。文章通过对HMIPv6协议的分析,提出了一种基于分层MAP的MIP切换方案,利用LMAP的引入解决了MAP管理域业务量平衡的问题,提高了系统的鲁棒性。     

改进的移动IPv6切换管理方案

基于分层思想的移动性管理方式被大家所认同,但区域间高延迟切换影响实时业务流的应用。针对层次移动IPv6协议及扩展方案中存在的切换问题和不足,提出一种动态级联式切换管理方案,该方案通过对移动锚点（MAP）的简单扩展,以级联接力的方式消除域间切换,实现全网范围的微移动。最后用数学推导的方式对该方案的性能进行分析与比较,直观地证明了该管理方案的优越性。     

改进的移动IPv6协议分析

在IPv4基础上发展起来的移动IPv6，比移动IPv4有很多优势，功能更为强大,更安全，必将在未来的移动互联领域发挥更大作用。但是当移动节点频繁移动时．标准移动IPv6协议会在网络中产生大量的注册报文，造成较大的注册延时,降低网络性能，因此有必要加以改进。本文介绍了两种改进的移动IPv6协议，并进行了详细分析。     

一种移动IPv6的切换优化方案

移动节点在两个不同子网之间移动时产生切换。移动节点的切换技术是保证实时业务服务质量的关键问题之一。目前比较经典的三种切换机制是快速移动IPv6、层次型移动IPv6和快速层次移动IPv6。在简单介绍了三种机制原理并分析了它们的不足后,提出了一种自适应移动IPv6切换时延优化方案。     

一种新的基于移动IPv6的快速切换方案

基本的移动IPv6（MIPv6）切换延迟非常大,不能满足实时业务的要求。本文基于对MIPv6的切换时延的分析,提出了一种IEEE802．11无线局域网环境下MIPv6的低时延切换方法,该方法通过结合使用连接触发器和快速路由器公告,并通过IP地址与MAC地址的映射机制来优化切换过程。仿真结果表明,该方法能够有效降低节点切换过程的时延,同时其性能优于以往相关的工作。     

移动IPv6快速切换性能中基于分层移动的方案分析

本文通过对移动IPv6快速切换性能中基于分层移动的方案HMFH进行了分析,探讨了该方案的设计思路、结构层次、切换管理等,并通过性能分析,论证了这一技术在实践中的可行性和有效性。     

一种新的移动IPv6移动性管理策略

在IETF制定的移动IPv6移动性管理策略中,当移动主机每次从一个子网移动到另一个子网时,都需要对家乡代理和相应的通信主机进行绑定更新,这就导致网络总的绑定和发送代价过高.本文提出了一种新的移动性管理策略,在利用现有网络结构的基础上,通过将移动主机的移动分为本地移动和家乡移动两种类型,来减少移动主机向家乡代理和相应的通信主机发送绑定更新消息,从而降低网络的绑定代价,使网络的性能得到改善.     

一种新的分层移动IPv6快速切换方案研究

分层移动IPv6快速切换在一定程度上减少了切换延时，但切换过程中由网络层移动检测和使用重复地址检测（DAD）配置一个新转交地址引起的延时对实时业务仍然有很大的影响。为了减轻这些影响，文中提出了一种更加有效的快速邻居发现和DAD机制，减小了切换延时，提高了网络的性能。     

一种优化的分层式移动IPv6路由策略的分析与研究

通过分析分层移动IPv6协议，提出一种基于分层机制的优化移动IPv6路由管理策略。该策略支持路由优化，能在域内、域间移动时实现快速切换以减少时延，提高网络资源利用率。     

浅析移动IPv6的基本原理及其扩展技术

移动通信和因特网的发展带给我们新机遇和新业务的同时,也带来了新的技术难题,传统的TCP/IP协议不支持主机的移动。移动IP技术正是为解决此问题而产生的一种新技术。本文首先了解了移动IPv4的功能实体和工作原理,介绍了移动IPv6操作原理并将其与移动IPv4比较。最后介绍了针对移动IPv6存在的问题而提出的三种扩展技术。     

Study of Heuristic MAP Selection and Abstraction Schemes with Load Balance in HMIPv6

In order to improve the performance of real time services in the mobile environment, the hierarchical approach was proposed to reduce the frequency of handoffs in the mobile IPv6 environment. The mobility anchor point (MAP) is adopted in a hierarchical manner to handle the location management of the mobile node within the MAP domain. An enhanced speed estimation scheme is provided in this paper to select the appropriate MAP so that the overhead of handoff can be minimized. Furthermore, the concept of abstract MAP (AMAP) node is proposed to extend the coverage domain of MAP. In addition to selecting a MAP with respect to the speed estimation of the mobile node in a heuristic way, the criteria of load balance is also investigated in this study. The performance of the proposed scheme is examined through exhaustive simulations. And the simulation results show that the proposed scheme can effectively achieve the above objectives.     

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.     

Scheme for improving transmission performance of realtime traffic using priority queues in HMIPv6

Hierarchical Mobile IPv6 (HMIPv6) has been proposed by the Internet Engineering Task Force (IETF) to reduce handoff latency and signaling overhead. In the new protocol, Mobility Anchor Point (MAP) receives all packets in place of Mobile Node (MN) and MAP services are transferred to Care of Address (CoA) of MN. However, a MAP may be a single point of performance bottleneck because the MAP should not only handle signaling traffic but also process data tunneling traffic for all MNs registered in a MAP domain. So, MAPs need MAP management scheme for the multimedia services or real time services. We propose a MAP selection scheme that can select different MAPs according to the traffic characteristics of MNs and a multilevel queue processing method that can process binding updates based on the priorities of queues in a MAP when MNs send BU. Quantitative results of the performance analysis show that our proposal can reduce the location update cost by 31% and the total cost by 14%. With the multilevel queues, we could reduce the total cost by 12% and 17% for D=4 and D=8 respectively.     

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。     

基于HMIPv6的寻呼扩展策略

本文首先对移动IPv6 (MIPv6 )和分级移动IPv6 (HMIPv6 )中的通信过程和各个功能实体进行了简单的介绍。然后在HMIPv6的基础上提出一种寻呼扩展结构 (PagingExtensiononHMIPv6 ) ,包括加入此寻呼扩展后的网络体系结构和各个功能实体的描述并定义了其中几个重要的报文结构。通过加入该寻呼扩展使MIPv6实现注册本地化的同时支持IPPagingSupport,提供更好的可扩展性。     

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.     

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。     

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.     

放大转发中继网络中的一种中继选择方案

提出了一种放大转发网络中的中继选择方案,假设目的节点配置多个天线,源节点和所有中继节点都配置单个天线,方案选择一组中继同时在相同的频带上放大转发接收到的源节点信息以最大化接收信噪比。与只择一个最优中继的方案相比,方案在保持满分集阶数的情况下获得了更高的中断容量和更优的误符号率性能。与只选择一个最优中继的方案相比,在0.000 01的误符号率水平上,少需要发射功率1.6 dB。     

基于信道统计特性的中继选择算法

该文提出了一种在非再生协作网络中,基于信道统计特性的最优中继选择方法。首先在等功率条件下,根据信道统计特性,定义一个等效信道增益的参数,该参数反映了中继节点在协作过程中两个阶段的信道特性。然后提出一种基于该参数的降序排列的中继选择方法。该方法在不同的信噪比范围内,选择不同的节点集合,使得系统的吞吐率中断概率最小。分析表明该选择方法的分集增益阶数能达到N+1,N为中继节点数目。仿真结果表明这种中继选择算法的中断概率性能优于其他算法。该方法进一步与功率分配相结合,构成了一种低复杂度的次优的中继选择方法。仿真结果表明这种次优算法能够取得和穷举算法相似的性能。