卫星网络HTTP加速技术研究

HTTP协议作为浏览网页的多交互式协议,给用户带来了很好的上网体验,当其应用于高延时卫星网络环境下时,会严重影响Web访问的效率。针对该问题提出一种适用于卫星网络的HTTP加速技术解决方案,主要采用将缓存和预取相结合的方法达到对HTTP协议加速的效果。Web预取和缓存技术以期降低用户的访问延迟,提高网络浏览速度,在高延时的情况下达到很好的用户体验。     

移动网络加速平台部署方案

通过对网络加速原理的解析,提出融合数据压缩、协议优化和智能缓存等技术,特有效减少无线及互联网侧的数据流量,提升用户感知.     

面向用户感知的移动互联网缓存加速系统研究

针对上海电信移动网提升用户网站访问速度体验的要求,从用户HTTP(超文本传输协议)访问目的地址分布、源站拨测和用户感知APP数据分析的三个维度,论证在移动核心网中部署Web Cache(互联网缓存加速)系统必要性。对比分析从策略路由引流和DNS(域名系统)+HTTP重定向两种缓存方式的缓存效果、扩展性,然后指出:在移动网单独建设DNS+HTTP重定向缓存加速系统方案更加合理。     

针对3G上网用户的无线网络加速系统

随着3G上网业务的不断发展,越来越多的用户使用3G网络移动上网,这样会导致无线资源紧张,影响用户的使用体验,同时也给移动网络带来了沉重的负担。针对这一问题开发了针对3G移动上网用户Web应用的无线网络加速系统,该系统使用缓存和数据压缩技术,可以通过单向透明或者双向透明2种无客户端的方式部署在移动数据网到互联网的出口位置,以便于产品的推广使用。对该系统进行的现网测试包括单用户测试和现网流量测试两个部分,测试结果表明,使用无线网络加速系统大幅度减少移动上网用户的Web页面打开时间,从而提高了用户体验;同时使用该系统后,对于移动用户的Web应用产生的流量,在网络出口一侧和无线接入网一侧,能实现16%以上的流量节省。     

WAP网关HTTP流量分流方案探讨

移动互联网日益增长的流量对WAP(无线应用协议)网关形成了巨大的冲击,然而其中大部分流量并不是必须通过WAP网关代理。采用DPI(深度包检测)解析分流+HTTP(超文本传输协议)代理缓存的分流方案,利用DPI技术将流入WAP网关的流量进行解析,对其中的HTTP业务访问流量进行分流,通过HTTP代理方式和缓存技术提供业务服务。方案能有效减轻运营商在WAP网关扩容建设中面临的软件License(许可证)费用过高问题,提高服务质量与用户感知。     

让3G网络更快速更高效

中国电信上海公司为了提高上海地区3G(第三代移动通信技术)网络的利用率,为用户提供更好的服务,引入了上网加速平台.加速平台对通过3G无线网络的用户数据进行分类后,使用数据压缩、协议优化、智能缓存等多种手段提高网络的实际利用率,改善用户通过3G网络上网时的实际感受.在现网环境下测试的结果也证实了通过加速后用户的上网时间和...     

基于重定向技术的P2P列表缓存系统研究

提出一种基于重定向技术的P2P(peer-to-peer)列表缓存系统,介绍了系统的设计原理、基本工作原理、软件设计和测试环境.该系统通过对BT客户端发送区域列表文件的方式,减少重复数据片断的网络出口传输,从而控制整个网络出口的P2P流量. 测试结果表明:本系统性能稳定,可以在保证用户正常上网体验的同时,大幅减少网络出口流量.     

HTTP/2.0关键技术及标准化进展

HTTP/2.0是标准化组织IETF正在制定中的新一代WWW应用协议标准,在保持对现有协议HTTP/1.1的前向兼容性的前提下,以异步并发、增量传输和关键内容优先等机制为手段,以期提升广域网网页浏览和移动应用的用户体验。互联网厂家和设备厂家分别从最大化Web应用加速效果、权衡移动终端综合效能和降低网络设备处理复杂度的角度,提出了不同的技术建议方案。     

移动智能终端操作系统网络流量控制策略研究

从智能终端对移动网络数据流量和信令流量的影响出发,总结主流操作系统和应用对网络流量的需求特点。然后从操作系统、移动网络和应用开发三个层面分析终端侧流量管控技术策略,就PUSH中心、网络连接请求管理、自动识别、平滑切换、网络快速休眠、连续分组连接等关键技术引入作了详细论证。最后提出手机操作系统流量管控建议,包括建设公共测试平台、加大管控技术研发和加快流量管控技术标准化。     

P2P业务量管控方式的探讨与应用

随着运营商P2P数据流量的大幅度增长,对P2P进行必要的管控是运营商改善网络运行和降低成本面临的关键问题。PPCache缓存系统是一套功能强大的P2P应用流量缓存优化系统,可对P2P业务流量进行有效管控。在实际应用中,该系统发挥了应有的作用,显示出很好的效果。     

TD-SCDMA网络Iu-PS接口协议关联方案的设计与实现

为了对TD-SCDMA 网络的用户流量进行识别以及对用户行为进行分析,对Iu-PS 接口的信令面与业务面协议进行了研究,设计出一种信令面和业务面协议关联的方案。针对传统信令监测系统和业务监测系统数据处理效率的不足以及无法将信令面与业务面数据进行关联的缺陷,利用增强型散列算法以及超时处理技术,设计出一种基于关键字段关联的信令面呼叫详细记录（call detail record,CDR）和业务面呼叫详细记录合成的协议关联方案,提高了数据处理效率,并实现了信令面和业务面数据的有效关联,为后期进行流量识别以及对用户行为进行分析奠定了基础。经过现网数据测试,验证了该协议关联方案的正确性与可行性,在移动互联网流量分析领域具有推广意义。     

Web Acceleration in Asymmetrical Mobile Network

End to end performance of web application degrades seriously in mobile networks because the inefficiencies of HTTP and TCP in lossy and asymmetrical environment. In this article, we discussed common architecture of web accelerator which embraces both HTTP and TCP optimization. Based on the feasibility analyses of various acceleration technologies in asymmetrical mobile network, the components of accelerator and their functions are provided. In order to explain how to choose function entities of accelerator and how to optimize their parameters in asymmetrical environment, we carried out three simulation based analyses. Firstly we characterize the correlations between user perceived web response time and asymmetrical link characteristics. Consequently, we show how HTTP compression strongly affects the web response time when uplink resources are limited. At the same time, our study demonstrated that caching scheme performs poorly when uplink quality degraded. In addition, possible potential methods for web response time and their design criteria are discussed.     

HTTP缓存技术在广电运营中的应用

HTTP缓存系统通过对Internet网上HTTP流量的缓存,节约了广电运营商的网络资源,缓解了Internet的出口压力,在三网融合的技术背景下,围绕广电互联网业务的实际情况,对使用缓存技术来提高广电宽带技术竞争力进行了研究分析。     

基于大数据计算的客户上网信息精确匹配关键技术研究及应用

在流量经营时代,运营商对用户上网行为的融合感知能力的不足越发明显。本文提出通过采用“深度包检测＋深度/动态流检测”、内容和计费话单关联技术、大数据处理技术还原用户的上网行为,识别客户真实需求、个性化需求,为解决客户上网质疑和流量营销打下坚实基础。     

Performance benchmarking of wireless Web servers

The advent of mobile computers and wireless networks enables the deployment of wireless Web servers and clients in short-lived ad hoc network environments, such as classroom area networks. The purpose of this paper is to benchmark the performance capabilities of wireless Web servers in such an environment. Network traffic measurements are conducted on an in-building IEEE 802.11b wireless ad hoc network, using a wireless-enabled Apache Web server, several wireless clients, and a wireless network traffic analyzer. The experiments focus on the HTTP transaction rate and end-to-end throughput achievable in such an ad hoc network environment, and the impacts of factors such as Web object size, number of clients, and persistent HTTP connections. The results show that the wireless network bottleneck manifests itself in several ways: inefficient HTTP performance, client-side packet losses, server-side packet losses, network thrashing, and unfairness among Web clients. Persistent HTTP connections offer up to 350% improvement in HTTP transaction rate and user-level throughput, while also improving fairness for mobile clients accessing content from a wireless Web server.     

Efficient policies for carrying Web traffic over flow-switchednetworks

To efficiently transfer diverse traffic over high-speed links, modern integrated networks require more efficient packet-switching techniques that can capitalize on the advances in switch hardware. Several promising approaches attempt to improve the performance by creating dedicated “shortcut” connections for long-lived traffic flows, at the expense of the network overhead for establishing and maintaining these shortcuts. The network can balance these cost-performance tradeoffs through three tunable parameters: the granularity of flow end-point addresses, the timeout for grouping related packets into flows, and the trigger for migrating a long-lived flow to a shortcut connection. Drawing on a continuous one-week trace of Internet traffic, we evaluate the processor and switch overheads for transferring HTTP server traffic through a flow-switched network. In contrast to previous work, we focus on the full probability distributions of flow sizes and cost-performance metrics to highlight the subtle influence of the HTTP protocol and user behavior on the performance of flow switching. We find that moderate levels of aggregation and triggering yield significant reductions in overhead with a negligible reduction in performance. The traffic characterization results further suggest schemes for limiting shortcut overhead by temporarily delaying the creation of shortcuts during peak load and by aggregating related packets that share a portion of their routes through the network     

Proactive content caching by exploiting transfer learning for mobile edge computing

To address the vast multimedia traffic volume and requirements of user quality of experience in the next‐generation mobile communication system (5G), it is imperative to develop efficient content caching strategy at mobile network edges, which is deemed as a key technique for 5G. Recent advances in edge/cloud computing and machine learning facilitate efficient content caching for 5G, where mobile edge computing can be exploited to reduce service latency by equipping computation and storage capacity at the edge network. In this paper, we propose a proactive caching mechanism named learning‐based cooperative caching (LECC) strategy based on mobile edge computing architecture to reduce transmission cost while improving user quality of experience for future mobile networks. In LECC, we exploit a transfer learning‐based approach for estimating content popularity and then formulate the proactive caching optimization model. As the optimization problem is NP‐hard, we resort to a greedy algorithm for solving the cache content placement problem. Performance evaluation reveals that LECC can apparently improve content cache hit rate and decrease content delivery latency and transmission cost in comparison with known existing caching strategies.     

对等网络流量检测技术研究

P2P流量检测技术可分为基于流量特征的识别方法(TLI)和基于深层数据包识别方法(DPI)。TLI通过对传输层数据包进行分析并结合P2P系统所表现出来的流量特征,来识别某个网络流是否属于P2P。DPI采用协议分析与还原技术,提取P2P应用层数据,通过分析其载荷所包含的协议特征值,来判断网络流量是否属于P2P应用。DPI由于具有准确性高、健壮性好、具有分类功能,是P2P流量识别的主要方法。如果能够结合TLI和DPI的优点,就有可能设计出一个准确、高效的P2P流量实时识别算法。     

高话务和高数据流量GPRS优化经验探讨

随着用户对数据业务的需求量越来越大,话音业务和数据业务对现网无线资源的竞争趋向激烈,如何做好在高话务和高数据流量时的GPRS网络优化工作是亟待解决的问题,本文主要讨论了合理分配高话务和高数据流量地区现网无线资源配置,积极试验和应用一系列新技术缓解资源竞争矛盾,摸索出维护和优化高话务和高数据流量地区GPRS网络的经验.