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Explicit Congestion Notification (ECN) lets a bottleneck's Active Queue Management (AQM) mechanism inform an endpoint about congestion without having to drop a packet. A recently proposed sender-side modification called Alternative Backoff with ECN (ABE) enables reduced latency while maintaining good utilization with ECN. However, under certain circumstances ABE can produce a degree of unfair behavior...
When multiple congestion controlled flows traverse the same network path, their resulting rate is usually an outcome of their competition at the bottleneck. The WebRTC / RTCWeb suite of standards for inter-browser communication is required to allow prioritization. This is addressed by our previously presented mechanism for coupled congestion control, called the Flow State Exchange (FSE). Here, we...
Community Wireless Networks can be a way to make “Internet access for everyone” possible, by sharing a broadband Internet connection via WLAN. The underlying idea is to freely provide network access to anybody in the vicinity of the wireless access point via a Lower-than-Best-Effort (LBE) service, such that non-paying users interfere as little as possible with the “regular” Internet usage. Such a...
Active Queue Management (AQM) design has again come into the spotlight of network operators, vendors and OS developers. This reflects the growing concern and sensitivity about the end-to-end latency perceived by today's Internet users. CoDel and PIE are two AQM mechanisms that have recently been presented and discussed in the IRTF and the IETF as solutions for keeping latency low. To the best of our...
This paper provides a survey of transport protocols and congestion control mechanisms that are designed to have a smaller bandwidth and/or delay impact on standard TCP than standard TCP itself when they share a bottleneck with it. Such protocols and mechanisms provide what is sometimes called a less-than-best-effort or lower than best-effort service. To a user, such a service can, for instance, be...
The growing use of real-time video in wireless networks, where loss rates are high yet bandwidth and CPU power of receivers can be scarce, calls for new methods to maintain good quality when packets are dropped. These methods should ideally only involve the sender and avoid increasing the amount of data sent across the network. We introduce a scheme that satisfies these requirements by selectively...
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