There have been a number of proposals for alternate semantics for the Explicit Congestion Notification (ECN) field in the IP header RFC 3168. This document discusses some of the issues in defining alternate semantics for the ECN field, and specifies requirements for a safe coexistence in an Internet that could include routers that do not understand the defined alternate semantics. This document...

Status of This Memo This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. This document may contain material from IETF Documents or IETF Contributions published or made publicly av...

This paper discusses our design and implementation of Explicit Congestion Notification (ECN) for TCP on IPv6. The first part of the paper describes how ECN marks packets instead of dropping them to signal incipient congestion. Marking packets instead of dropping them carries a number of benefits, such as avoiding costly delays waiting for retransmissions timeouts or dropping packets on flows se...

Fast Congestion Notification (FN) is one of the proactive queue management mechanisms that practices congestion avoidance to help avoid the beginning of congestion by marking/dropping packets before the router’s queue gets full; and exercises congestion control, when congestion avoidance fails, by increasing the rate of packet marking/dropping. Technically, FN avoids the queue overflows by cont...

The application of backward explicit congestion noti cation (BECN) to an ATM LAN is investigated in order to support the dynamic sharing of bandwidth between high-speed, bursty, data tra c sources. The results of a simulation study are presented which suggest that a BECN mechanism may provide simple and e ective tra c management for an ATM LAN or campus backbone network of up to at least 50 km ...

Explicit Congestion Notification (ECN) is an TCP/IP extension to signal network congestion without packet loss, which has barely seen deployment though it was standardized and implemented more than a decade ago. On-going activities in research and standardization aim to make the usage of ECN more beneficial. This measurement study provides an update on deployment status and newly assesses the m...

Maintaining the quality of service (QOS) and controlling the network congestion are quite complicated tasks. They cause degrading the performance of the network, and disturbing the continuous communication process. To overcome these issues, one step towards this dilemma has been taken in form of Pre-congestion notification (PCN) technique. PCN uses a packet marking technique within a PCN domain...

This memo specifies how Explicit Congestion Notification (ECN) can be used with the Real-time Transport Protocol (RTP) running over UDP, using the RTP Control Protocol (RTCP) as a feedback mechanism. It defines a new RTCP Extended Report (XR) block for periodic ECN feedback, a new RTCP transport feedback message for timely reporting of congestion events, and a Session Traversal Utilities for NA...

Explicit Congestion Notification (ECN), when used with Random Early Detection (RED) gateways, reduces packet losses and delays of Transport Control Protocol (TCP) based applications. However, choosing the buffer size and optimum parameter values of RED buffers are still open research issues. In this paper, we first present a model to determine the optimal value of RED’s maximum threshold to ach...

We investigate the problem of efficient resource control for elastic traffic in IEEE 802.11e’s Enhanced Distributed Channel Access (EDCA) mechanism. Our approach considers an economic modelling framework based on congestion pricing that captures how various factors, such as the probability of attempting to transmit a frame, the use of the basic CSMA/CA or the RTS/CTS procedure, and the physical...