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Martin Heusse, Guillaume Urvoy-Keller Andrzej Duda and Timothy X Brown

Least Attained Recent Service for Packet Scheduling over Wireless LANs

In proceedings of IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks (WoWMoM 2010)

Monday 14 June 2010

Wireless LANs suffer from performance problems caused by insufficient
medium access opportunity given to the access point. Consequently, the
downlink buffer fills up, which often leads to packet losses. We propose
to address this problem by using a size-based scheduling approach,
which is known to favor short flows and the start up of new ones — a
very appealing property from the user’s perspective as
interactive applications and new flows are serviced quickly. Still,
size-based scheduling policies have a well-known Achilles heel: large
flows can block each other for long periods of time and low rate
multimedia transfers may end up with a low priority when their
accumulated transferred volume becomes large. To solve the above
deficiencies, we propose a new packet scheduling scheme called em
Least Attained Recent Service (LARS) that applies a
temporal decay to the volume of data associated with each flow. In
this way, its priority depends more on what has happened
recently. With this strategy, LARS can bound the impact of a new
arriving flow on ongoing flows, thus limiting lock out durations.
It can also efficiently protect low rate multimedia transfers
irrespectively of the load conditions.


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