Elastic Fairness Definition and Threshold-Based Congestion Control Policy for Real-Time IP Multicast Flows
Ma Yu · Chinese Journal of Computers · 2002
This paper proposes a new elastic fairness for real-time IP multicast traffic. The definition can be applied in performing flow and congestion control for real-time IP multicast traffic, together with multicast group measurement and multicast congestion control mechanisms. Different services have different service requirements, and data service is more sensitive for bandwidth, although real-time service focuses more on delay and jitter. Elastic fairness specifies different levels for different sessions from the jitter point of view. So fairness is guaranteed not only in bandwidth, but also in rate variation. Authors further devise two algorithms to apply the generalized fairness concept in congestion control. Time-based algorithm adjusts sending rate gradually in a step length of round trip times. Loss rate-based algorithm adjusts sending rate by different equation, which depends on the session weights. Therefore, real-time multicast flow meets both elastic fairness in small time scale and proportional fairness in large time scale.