RED-Worcester - Traffic Sensitive Active Queue Management
نویسندگان
چکیده
The Internet today carries traffic for applications with a wide range of delay and throughput requirements. Traditional applications such as FTP and E-mail can tolerate high delays due to long router queues in exchange for high throughput. Emerging applications such as IP telephony, video conferencing and networked games, on the other hand, have have more stringent delay constraints than loss constraints, leaving end-to-end delay and delay jitter as their major impediment to acceptable quality. Thus, interactive multimedia applications often prefer smaller queues in Internet routers, even if this means higher losses and lower throughput. Unfortunately, current Internet routers do not provide a Quality of Service (QoS)1 adapted to the current traffic mix. Most Active Queue Management (AQM) techniques are either heavy-weight by requiring significant architectural changes or focus on providing higher throughput at the router without much consideration for queuing delays. RED [4], probably the best-known AQM mechanism, attempts to keep the average queue size at the router low while keeping throughput high. Adaptive RED (ARED) [2] adjusts the RED operating parameters to accommodate a wider range of traffic loads. However, both RED and ARED provide equal treatment to incoming traffic and tend to be tuned for high throughput without any consideration for the traversing applications’ aggregate delay requirements. By requiring per flow signaling and reservations via RSVP by all routers on the connection path, IntServ provides per flow QoS guarantees. However, the complexity of the RSVP signaling and the per flow soft state required at each router means that IntServ does not scale well with number of flows. DiffServ approaches, such as Assured Forwarding (AF) and Expedited Forwarding (EF), provide differentiated service to traffic aggregates. However, they require compli-
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تاریخ انتشار 2002