[论文解读] Dynamic Distributed Mobility Management System based on Multiple Mix-Zones over Road Networks

Imran Memon, Qasim Ali Arain|arXiv (Cornell University)|Jun 6, 2017

IPv6, Mobility, Handover, Networks, Security参考文献 17被引用 8

一句话总结

本文提出了一种基于多个混合区域的动态分布式移动性管理（DDMM）系统，以减少车载网络中的切换延迟和数据包丢失。通过在代理移动IPv6（PMIPv6）基础上扩展快速切换机制和分布式锚点管理，DDMM在道路网络上提升了会话连续性和性能，其在延迟和可靠性指标上优于现有方案。

ABSTRACT

Vehicle have access to the internet for communications to facilitate the need of mobility management and point of interest distribution in emerging Intelligent Transportation System (ITS) . Therefore, its obvious that by changing the road side unit frequently , may require fast handover management to mobile user (MU) for the configuration of new IP address , however the ongoing session remain un-disturbed . Recent study has shown that , the current version of IP mobility protocols are the centralized solutions, In centralized environment data traffic and data management is being routed to an anchor entity.In some situations , the vehicles may be routed in the form of group to pass from one RSU to another RSU.In response the traffic and mobility exchanged messages are increased and it will dramatically affect the performance of network.To cope with these challenges a new construct named DDMM (Dynamic Distributed Mobility management) has been anticipated by IETF DDMM organization. It has been designed on the basis of network-based CMM protocol, which is known as Proxy Mobile IPv6(PMIPv6).However , it has been realized that there can be significance difference among network based DDMM and PMIPv6 with respect to handover latency and packet loss.Therefore , we have envisioned fast handover for network-based DDMM (Dynamic Distributed Mobility management) which is based on fast handover for PMIPv6(PFMIPv6).However , it has been required to include modifications on PFMIPV6 to take on DDMM. We have designed some important additions to support this model, when MU hold IP flows and has many different anchor entities.In addition we also derived analytical expressions to check and made comparison about the handover performance of the given DDMM schemes.It has been revealed that DDMM has outperformed in terms of handover latency , session recovery and packet loss as compared with previous schemes.

研究动机与目标

• 解决集中式IP移动性协议在高移动性车载环境中的局限性。
• 减少智能交通系统（ITS）中频繁的路边单元（RSU）切换时的切换延迟和数据包丢失。
• 设计一种可扩展的分布式移动性管理方案，避免基于锚点系统的单点瓶颈。
• 提升具有多个IP流的移动用户（MUs）的会话连续性和性能。
• 评估并比较DDMM与现有PMIPv6和PFMIPv6方案的性能。

提出的方法

• 提出一种基于代理移动IPv6（PMIPv6）的基于网络的DDMM架构，实现多个混合区域间的分布式锚点分配。
• 采用受快速代理移动IPv6（PFMIPv6）启发的快速切换机制，以最小化信令和数据中断。
• 对PFMIPv6进行修改，以支持车载场景下的动态锚点选择和流级移动性管理。
• 使用混合区域作为逻辑区域，以本地化移动性信令并减少切换过程中的信令开销。
• 应用分析建模推导关键性能指标，如切换延迟和数据包丢失率。
• 通过支持每流锚点分配和快速会话恢复，实现每个移动用户支持多个IP流。

实验结果

研究问题

• RQ1 所提出的DDMM系统相较于集中式PMIPv6和PFMIPv6，如何降低切换延迟？
• RQ2 分布式锚点管理对车载切换期间的数据包丢失有何影响？
• RQ3 使用多个混合区域如何影响高移动性环境中的信令开销和可扩展性？
• RQ4 DDMM在多IP流移动用户场景下，能在多大程度上维持会话连续性？
• RQ5 在切换信令和数据传输方面，DDMM的性能与现有移动性协议相比如何？

主要发现

• DDMM通过利用快速切换机制和分布式锚点，显著降低了与传统PMIPv6和PFMIPv6相比的切换延迟。
• 由于信令优化和切换事件中更快的会话恢复，系统实现了更低的数据包丢失率。
• 分析结果证实，DDMM在切换延迟和会话恢复时间方面均优于现有方案。
• 使用多个混合区域有效本地化了信令，并减轻了任一锚点的负载，从而提升了可扩展性。
• DDMM支持每个移动用户多个IP流，且性能下降极小，实现了稳健的服务连续性。
• 性能评估表明，即使在高移动性和密集车载流量条件下，DDMM仍能保持高可靠性。