Autonomic Management for Capacity Improvement in Wireless Networks

Energy-efficient wi-fi gateways for federated residential networks

“…The Gateways that successfully carry out an offload procedure and become "off" correspond to downward curves, while Gateways that associate relocated WSs see their throughput grow. A sample of a successful offload can be observed in the interval [3,4] s where a Gateway, upon switching itself off, relocates its three WSs to two other Gateways whose throughput therefore increases. Eventually (at t=8.5 s), the federated network settles at 3 "on" Gateways out of 10.…”

“…Next, we consider a different traffic scenario where initially all 10 Gateways serve the same number of WSs (namely, 2, 4,6). Each WS generates a UDP flow with the same offered load, which is a varying parameter in different test runs.…”

“…However, existing passive estimation techniques are not mature to fully support multi-rate WLANs with variable traffic patterns. Metrics based either on the number of associated WSs [2], the channel busy (or, equivalently, idle) time [3], [4], or the aggregated BSS throughput [5], are affected by the payload size and the data rate of the transmitted packets. It follows that such metrics may indicate the availability of bandwidth when the saturation throughput has been already reached, or, conversely, they may detect saturation in presence of available bandwidth.…”