结合多重分形的网络流量非线性预测

通过分析树型多重分形结构的相关性发现,多重分形可以把非平稳且具有长相关（LRD）和分形特性的网络流量序列转化为可用短相关（SRD）模型表示的序列组。利用多重分形这种将时间序列分解为多层的能力,提出了一种结合多重分形的FIR神经网络流量预测模型（MF-FIR,multifractal FIR network）。MF-FIR合理地利用了流量序列的LRD信息,具有很好的多步预测性能,可以满足通信系统在线预测的要求。     

Multiplicative multifractal modelling of long‐range‐dependent network traffic

We present a multiplicative multifractal process to model traffic which exhibits long‐range dependence. Using traffic trace data captured by Bellcore from operations across local and wide area networks, we examine the interarrival time series and the packet length sequences. We also model the frame size sequences of VBR video traffic process. We prove a number of properties of multiplicative multifractal processes that are most relevant to their use as traffic models. In particular, we show these processes to characterize effectively the long‐range dependence properties of the measured processes. Furthermore, we consider a single server queueing system which is loaded, on one hand, by the measured processes, and, on the other hand, by our multifractal processes (the latter forming a MF_e/MF_g/1 queueing system model). In comparing the performance of both systems, we demonstrate our models to effectively track the behaviour exhibited by the system driven by the actual traffic processes. We show the multiplicative multifractal process to be easy to construct. Through parametric dependence on one or two parameters, this model can be calibrated to fit the measured data. We also show that in simulating the packet loss probability, our multifractal traffic model provides a better fit than that obtained by using a fractional Brownian motion model. Copyright © 2001 John Wiley & Sons, Ltd.     

故障条件下通信网的端-端业务流量算法

本文针对具有Ｋ类优先级业务的电信网,运用数学理论方法分析其在故障条件下的端－端业务流量。在假设网络采用顺序帐由选择方式下,提出了计算端－端业务流量的理论分析算法。应用该算法可计算得到通信网端－端业务流量的上限值。     

Application‐Level Traffic Monitoring and an Analysis on IP Networks

Traditional traffic identification methods based on well‐known port numbers are not appropriate for the identification of new types of Internet applications. This paper proposes a new method to identify current Internet traffic, which is a preliminary but essential step toward traffic characterization. We categorized most current network‐based applications into several classes according to their traffic patterns. Then, using this categorization, we developed a flow grouping method that determines the application name of traffic flows. We have incorporated our method into NG‐MON, a traffic analysis system, to analyze Internet traffic between our enterprise network and the Internet, and characterized all the traffic according to their application types.     

Distributed Routing Based on Minimum End‐to‐End Delay for OFDMA Backhaul Mobile Mesh Networks

In this paper, an orthogonal frequency division multiple access (OFDMA)‐based minimum end‐to‐end delay (MED) distributed routing scheme for mobile backhaul wireless mesh networks is proposed. The proposed scheme selects routing paths based on OFDMA subcarrier synchronization control, subcarrier availability, and delay. In the proposed scheme, OFDMA is used to transmit frames between mesh routers using type‐I hybrid automatic repeat request over multipath Rayleigh fading channels. Compared with other distributed routing algorithms, such as most forward within radius R, farthest neighbor routing, nearest neighbor routing, and nearest with forwarding progress, simulation results show that the proposed MED routing can reduce end‐to‐end delay and support highly reliable routing using only local information of neighbor nodes.     

移动网络端到端容灾建设思路探讨

本文从移动网络端到端容灾的角度对网络容灾建设思路进行探讨,论文主要分析了基础网络、业务网络、支撑网络等不同层面的网络容灾需求,以基础网络为例对端到端的网络容灾进行了分析,提出了全网络容灾目标,并给出网络容灾实施建议。     

IP电信网体系架构刍议

因为现实和演进等原因．电信网络IP化的趋势不可阻挡,IP技术最成功的应用就是Internet,但30多年来Internet已经从教育科研走向了商业化应用,再加上技术和社会进步,相关政策的调整等原因,其核心设计理念“端到端的透明性”面临着严峻挑战,已经成为很多问题(尤其是商业模式和安全问题）的根源。因此,构建IP电信网不应是简单地在现有的IP之上增加业务控制、QoS和安全机制等,而是要更新Internet的设计理念,从体系架构开始重新考虑。