Performance Engineering Lab Dublin

Keywords:

Abstract:

In this paper a scheme is proposed to deal with
congestion problems that can arise due to Link Adaptation (LA)
in Wireless Local Area Networks (WLANs) in the presence of
VoIP traffic. The proposed scheme operates by first determining
if LA has resulted in the system becoming congested. If not, no
further action is taken. However, if, LA has resulted in an
overloaded system, the voice codec of the handset which has
undergone LA is adapted so as to restore the system to its earlier
state, thereby alleviating the congestion. This is achieved by
specifically adapting the codec so as to maintain approximately
the same level of medium usage as was used prior to the LA. The
proposed scheme was evaluated on an experimental test-bed and
results show that the codec adaptation was very effective at
overcoming the problem of LA.

• Tagged
• XML
• BibTex