• 802.11s
• MDA
• mesh
• ns2
• qos
• wifi

IEEE 802.11s is a draft IEEE 802.11 amendment for mesh networking, defining how wireless devices can interconnect to create an ad-hoc network.
It includes some mesh-specific optional MAC enhancements like Mesh Deterministic Access, Common Channel Framework, Intra-mesh Congestion Control and Power Management.

Mesh Deterministic Access (MDA) is an access method that allows MPs to access the channel at selected times (called MDAOPs) with lower contention than would otherwise be possible.

In this work we study Mesh Deterministic Access (MDA) feature. Specifically: we implement 802.11s in ns-2 simulator and evaluate performance comparing results with those obtained with DCF.

We also propose an improvement called Dynamic Relocation.
Dynamic Relocation permits to overcome MDA limits by reallocating MDAOPs basing on statistics collected during transmission times.

The effectiveness of MDA improved with Dynamic Relocation in a scenario with realistic traffic is then confirmed via a simulation analysis.