智慧协同一体化网络服务适配机制研究

发布时间：2018-05-14 03:41

本文选题：缓存准入策略 + 缓存一致性　；参考：《北京交通大学》2017年博士论文

【摘要】：作为全球最大的信息共享平台,互联网在促进科技发展、经济腾飞、民生提升等诸多方面发挥着不可替代的作用。然而,现有互联网因其原始设计缺陷已难以满足当今用户和运营商的多元化需求,在异构网络融合、资源利用率等诸多方面暴露出难以解决的弊端,严重阻碍其可持续发展。为此,设计全新的未来网络体系架构已成为世界各国最为重视的研究领域之一。然而,该领域的发展尚处起步阶段,相关机制、技术细节仍需进一步探索和完善。智慧协同网络、一体化标识网络作为新型网络体系架构,旨在提升网络的开放性、灵活性、可管可控性、运行效率等,具有良好的发展前景。本文在全面调研国内外相关领域研究现状的基础上,依托“智慧协同网络”、“一体化标识网络”(以下简称“智慧协同一体化网络”)总体设计思想,就体系架构细化拓展、服务适配机制设计两大关键问题开展深入研究,主要工作和创新点包括如下4个方面:(1)针对现有互联网所存在的异构网络融合差、移动性支持不足、传输效率低等问题,提出了智慧协同一体化网络下的一种异构网络高效互联的组网方案,该方案重新设计了网络的命名空间、结构组成、实体功能、注册更新和传输机制,以解决上述互联网弊端。为验证其可行性,搭建相关原型系统并进行测试。测试结果表明,所提组网方案可满足异构网络融合的设计需求,并在移动性、流量迁移、传输效率等方面较之现有互联网架构存在明显优势。例如,该组网方案实现了网络层面的天地网络有效互联,终端移动切换时延从秒级降为毫秒级。(2)针对服务内容适配问题,提出了两种复杂度为O(1)的路由器缓存准入策略,实现路由器对服务内容的流行度感知与按需存储,提升用户体验及适配效益。通过大量仿真评估了所提路由器准入策略的性能。此外,在仿真中还实现了其它7种常用复杂度为O(1)的准入策略用于对比。结果表明,所提两种缓存准入策略在所测性能指标中表现良好。例如,较之内容为中心网络所使用的默认准入策略LCE,所提两种缓存准入策略在用户服务内容平均获取距离上降低17%以上。(3)为进一步完善服务内容适配机制,提出了缓存路由器一致性问题解决方案,尽量避免路由器缓存过期的流行服务内容,实现一致性检查强度与其对应开销的平衡。此外,还将网页缓存系统中所使用的缓存一致性方案PET和TTL进行优化提升,以适应缓存路由器网络的新特点。为了验证所提方案的性能,首先,通过数学模型对所提三种方案进行初步的开销评估,其次,通过大量仿真对这些方案做进一步的测试和探究。测试结果显示,较之改进后的PET,所提方案在用户服务内容平均获取距离上显著降低,较之改进后的TTL,所提方案在用户获取服务内容过期率上大幅下降。(4)针对服务功能适配问题,提出了服务功能为导向的通信基础框架,为智慧协同一体化网络服务功能按需适配提供体系支撑。其次,提出以节能为目标的虚拟服务功能链映射优化模型以及相应启发式算法,以提升服务功能适配效益。通过相关原型系统验证所提框架的可行性和有效性,通过大量仿真验证所提优化模型和算法在网络开启虚拟机数量、剩余资源等节能上的优势。通过上述研究,进一步充实、完善智慧协同一体化网络架构和相关机制,为新型网络体系及关键技术的探索提供一种新思路。
[Abstract]:As the largest information sharing platform in the world, the Internet plays an irreplaceable role in promoting the development of science and technology, the economic take-off and the promotion of the people's livelihood. However, the existing Internet is difficult to meet the diversified needs of today's users and operators because of its original design defects, and the integration of heterogeneous networks, resource utilization and so on. Therefore, the design of a new network architecture has become one of the most important fields of research all over the world. However, the development of this field is still in the initial stage, and the related mechanisms and technical details need to be further explored and perfected. As a new network architecture, network is designed to improve the openness, flexibility, controllability and operation efficiency of the network, and it has a good development prospect. Based on the comprehensive investigation of the research status in the related fields at home and abroad, this paper relies on the "intelligent cooperative network" and "integrated identification network" (hereinafter referred to as "intelligent synergy". The main work and innovation points include the following 4 aspects: (1) aiming at the problems of heterogeneous network convergence, lack of mobility support, low transmission efficiency and so on, the wisdom synergy is put forward. An efficient interconnection network scheme for heterogeneous networks. The scheme redesigns the namespace, structure, entity function, registration update and transmission mechanism to solve the disadvantages of the Internet. In order to verify its feasibility, a related prototype system is built and tested. The test results show that the proposed network scheme is available. It meets the design requirements of heterogeneous network fusion, and has obvious advantages over the existing Internet architecture in terms of mobility, traffic migration and transmission efficiency. For example, the network scheme realizes the effective interconnection of the network layer network, and the terminal mobile handoff delay is reduced from second level to millisecond level. (2) the problem of service content adaptation is proposed. Two kinds of router caching admittance strategy with complexity of O (1) are used to realize the popularity awareness and on-demand storage of the service content, improve the user experience and benefit. The performance of the admittance strategy of the routers is evaluated through a lot of simulation. In addition, the other 7 other admittance strategies with O (1) complexity are also implemented in the simulation. The results show that the proposed two cache admittance strategies perform well in the measured performance indicators. For example, the default access strategy LCE used in the central network is compared with that of the two caching access strategies, and the two caching access strategies are reduced by more than 17% on the average access distance of the user service content. (3) it is proposed to further improve the service content adaptation mechanism. Cache router conformance problem solution, avoid the popular service content of router cache expired as far as possible, realize the balance of consistency check intensity and its corresponding overhead. In addition, the cache consistency scheme PET and TTL used in the web caching system are optimized to adapt to the new characteristics of caching router network. To verify the performance of the proposed scheme, first of all, through the mathematical model for the initial cost assessment of the three schemes, secondly, through a large number of simulations to further test and explore these schemes. The results show that compared with the improved PET, the proposed scheme decreases significantly in the average access distance of the user service content, and is better than that of the improved scheme. TTL, the proposed scheme has greatly reduced the content of user access to service content. (4) in view of the service function adaptation problem, a service function oriented communication infrastructure is proposed to provide system support for the integration of intelligent cooperative network service function according to demand. Secondly, a virtual service function chain mapping optimization model with energy saving as the target is proposed. Type and corresponding heuristic algorithm to improve the efficiency of service function, verify the feasibility and effectiveness of the proposed framework through the related prototype system, and through a large number of simulation and validation of the optimization model and algorithm in the network to open the number of virtual machines, the surplus resources and other advantages. Through the above research, further enrich, perfect the wisdom Association. The integrated network architecture and related mechanisms provide a new idea for the exploration of new network systems and key technologies.

【学位授予单位】：北京交通大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：TP393.09

【参考文献】