Using active queue management to enhance performance in IEEE802.11

Abstract

Active Queue Management (AQM) is most commonly used in wired networks, principally in backbone routers where packet loss is due to network congestion. In this work we extend AQM to wireless networks. In particular, a new priority queue algorithm is introduced which helps to manage both control and routing packets in the wireless network. This priority queue algorithm offers an improvement in QoS for some services; specifically for TCP traffic and real time services that are sensitive to the loss of control and routing packets. Key AQM schemes (RED, REM, AVQ, Blue and RIO) are extended to incorporate the priority queue algorithm. The behaviour and performance of the augmented schemes is then examined through simulation.

Enhancing AQM performance on wireless networks

“…When considering the use of AQM in IEEE 802.11 [8] [7] CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) [13] networks the Theoretical Maximum Throughput (TMT) [6] has been identified [5] as a key input parameter.…”

“…We adopt the same infrastructure network configuration as [5]: Each simulation starts with 10 unidirectional TCP flows from 10 sources to 10 destinations (Mobile Stations). Every 50 seconds 10 flows are added, up to a maximum of 30 sources and destinations.…”

“…They start dropping packets before the queue becomes full but at a point where they estimate that the system is becoming congested. The extension of AQM to the wireless domain was detailed in [5], where active queue management is used to enhance the performance of IEEE802.11 [13]. In this work we devise strategies to conform some of existing AQM schemes to the original design when deployed in wireless IEEE802.11 networks.…”

Extended Queue Management Backward Congestion Control Algorithms for Web Transfers in Wireless Environment

“…Active Queue Management (AQM) is most commonly used in wired networks, principally in backbone routers where packet loss is due to network congestion [8].…”