网络流量的相图

交通数据的去趋势波动分析

Detrended fluctuation analysis of traffic data

不同的路由策略会导致不同的网络流量行为。本文采用去趋势波动分析（DFA）方法对三种典型路由策略下的流量数据进行相关性分析，发现流量数据的相关程度可以分为三个区域，即：弱、中、强相关性。DFA标度在弱相关和强相关区域都是常数，但在中等相关区域单调增加。我们建议将复杂网络上的业务分为三个阶段，即，空闲、缓冲和拥塞阶段，而不是之前认为的两个阶段，即，自由和拥挤阶段。

An Approach to Avoid the Unreal High Flows on Congested Links and Investigates the Evolution of Congestion over Network

The unreal high flows may appear on the actually congested links in the result when a monotonically increasing link travel time function of flow volume is adopted in traffic assignment. The fixed link flow results of a static traffic assignment model (TAM) make it nearly impossible to investigate and make use of the actual evolution of congested zones over the network during the predetermined observation time period. Many methods, such as TAMs with side-constraints on link flow capacity and the pseudo dynamic traffic assignment based on day-by-day traffic, have been proposed to improve the rel…