【作者】 宋梅；

【导师】 宋俊德；

【作者基本信息】 北京邮电大学 ， 电路与系统， 2009， 博士

【摘要】 未来的移动通信系统将是一种基于全IP技术、支持多种无线接入方式和无缝漫游功能的异构融合网络。由于各种网络的体系结构和底层技术存在差异性,不同的接入网络采用了不同的移动性管理技术、业务质量保证机制以及认证、授权和计费(AAA, Authentication, Authorization and Accounting)方案,这些传统的单一网络中的解决方案不能有效的支持异构网络间的协同工作,多网络融合仍然面临着诸如保证服务质量和安全性、提高无缝移动的用户感知、提高融合网络整体性能等难题。为满足未来移动通信系统中多网络融合的发展需要,在任何环境下为用户提供最佳连接,保证无缝的高效可靠的服务,提高融合网络的整体性能和效率,必须设计开放、高效、与接入技术无关的动态服务质量(QoS, Quality of Service)保证机制、自适应移动性管理方案以及快速移动AAA认证方案,本文针对这三个方面进行了深入研究,主要工作和创新点如下：(1)提出了一种分级移动IPv6 (HMIPv6, Hierarchical Mobile IPv6)框架下基于位置管理的动态QoS预留方案(RM-DQR)。通过周期性测量小区间的历史切换强度或历史业务流量强度,动态自适应地将历史切换强度／业务流量强度较大的邻居小区划归到同一移动锚节点(MAP, Mobility Anchor Point)管理域内,从而在重新进行QoS预留时,能够有效的将重建路径控制在域内范围。所提出算法能够有效减少系统QoS信令开销和QoS路径重建时延。(2)针对分级移动IP结构存在的负荷集中和单点故障问题,提出了一种基于分级移动IP的自适应移动性管理方案,包括自适应的MAP选择方案和高效的MAP故障发现和恢复机制。自适应的MAP选择方案基于分布式MAP结构,通过采用二层触发机制提供的底层信息,基于策略自适应地选择MAP来有效地进行MAP负荷分担。提出了高效的MAP故障发现和恢复机制,采用互联网控制信息协议(ICMPv6)消息来发现MAP故障,减少了故障发现时间,利用主备用绑定信息加快了MAP故障恢复的过程。理论上分析了自适应移动性管理方案的性能,并同标准的分级移动IPv6协议进行了比较。数值和仿真结果表明,自适应移动性管理方案的MAP可靠性、分组丢失率以及MAP故障发现和恢复时间都得到了优化。(3)通过分析现有的移动IP和AAA的融合方案不足,提出了一种增强型的AAA认证方案(E-AAA, Enhanced AAA)。该方案中引入快速分层移动IPv6的思想,给出了具体的切换密钥生成和管理方案,该方案的提出,保证了切换过程的安全性。E-AAA方案的提出,在保障切换安全的基础上,进一步地解决了切换过程中由于引入认证过程而造成的过大开销,不仅使得在域内的认证开销得到了降低,而且域间的开销同样得到了进一步地降低。(4)提出了一种适用于3GPP-WLAN融合网络的融合AAA的最优部署方案。首先给出了一种融合认证架构,并且基于该融合认证架构进行理论分析和仿真。仿真结果表明,通过合理地设置认证矢量组的AV数目、发起AV请求的次数以及每个AV可以使用的重认证次数,可以使得系统开销降低到最小。该方案的提出,将对未来移动IPv6商业部署时,相关AAA设施部署提供理论指导。更多还原

【Abstract】 Mobile telecommunication system in the future will be heterogeneous converged networks, which based on all IP (Internet protocol) technology, integrate different types of radio access technology, support the seamless handover and roaming between heterogeneous networks. Since different networks has different system architecture and lower layer technologies, the mobility management technology, QoS guarantee mechanism and Authentication, Authorization and Accounting (AAA) of different networks are different, these solutions in single network cannot support the cooperation between different networks. The convergence of heterogeneous networks pose a large number of challenging issues, such as, QoS guarantee and security, user experience of seamless mobility, and the overall system performance of the integrated networks. In order to meet the demand for the development of mulitple networks convergence, provide the best connection for each user under any circumstance, guarantee the seamless reliable service, and imporve the performance and efficiency of the integrated networks, the dynamic QoS guarantee mechanism, adaptive mobility management scheme and fast mobile AAA solution, which are open, high efficient and unrelated to access technology should be designed. This paper investigated on these three topics and the contribution of the paper is as follows:(1) A dynamic QoS reservation mechanism (RM-DQR) based on location information in the framework of HMIPv6 is proposed. The handover and traffic intensity in history can be measured periodically. According to the results reported, neighbor cells, which have high handover or traffic intensity between each other, can be deployed in the management region of the same MAP. Then the re-reservation path can be controlled in the intra-domain when new reservation path should be established. The proposed scheme can greatly reduce the QoS signaling cost and shorten the delay of re-reservation path establishment.(2) In order to solve the problems of load convergence and single point of failure, a novel adaptive mobility management scheme based on hierarchical mobile IP is proposed, including the adaptive MAP selection scheme and high efficient MAP failure detection and recovery mechanism. The adaptive MAP selection scheme is based on distributed MAP enviroment, the lower layer information are provided by adopting the Layer 2 trigger mechanism, and the policy based MAP selection can efficiently achieve load balancing. The proposed high efficient MAP failure detection and recovery mechanism adopts ICMPv6 protocol to detect the MAP failure, which reduces the failure detection time, the failure recovery process is accelerated by using the primary and backup mobility binding of mobile nodes. The performance of the adaptive mobility management scheme are analysed theoretically, and are compared with the standard hierarchical mobile IPv6 protocol. Mathematical and simulation results show that the MAP reliability, packet loss rate and MAP failure detection and recovery time are optimized with the proposed adaptive mobility management scheme.(3) By analyzing the disadvantages of current mobile IP and AAA integration schemes, an enhanced AAA authentication scheme (E-AAA) is proposed. This scheme introduces the principle of hierarchical mobile IPv6, which works out the switching key generation and management specifically, in order to ensure the safety of switching process. In addition, under the premise that security is guaranteed, this scheme further resolves the critical overhead because of the authentication. It not only makes the authentication cost in the region reduced, but also the cost inter-domain.(4)An optimal AAA integration scheme for 3GPP-WLAN has been proposed. A framework of integration authentication is put forward, and then the theoretical analysis and the simulation are carried out based on the integration authentication architecture. As the simulation result shown, the system overhead can be reduced to the minimum, as long as the number of authentication vector group AV, AV request and re-authentication times for each AV is set reasonably. This scheme provides theoretical guidance for AAA facility deployment and commercial deployment of Mobile IPv6 in the future.更多还原