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(BEST-AP (Key factors: (Based on the fact (chanenl load changes mor…
BEST-AP
Key factors:
Based on the fact
chanenl load changes mor rapidly as combined effect of
PHY rate variations
frame loss
Minimum changes to the AP and WLAN drivers
does not require changes to the MAC layer
works with current autorate and other standards featuresof teh driver
supports mobility
Fast Handover
using SDN concepts
such as OpenFlow
Tested in
KAUMesh
robust to interference and
cross traffic
Rapid Convergence time
How the paper is divided:
Section 2
Extensive measrurements
why frequent measurements of available bandwidth are nccessary
Section 3
insights for the New Model
to estiamte the bandwidth of the WLAN Link
Section 4
How the availalble bandwidth selection estimation is used for AP selection
Section 5
Evaluation
Section 6
Limitation
Future Works
Section 7
Survey other rlated works
Compare BEST AP with it
Section 8
Summary
Abstract
Keyfactors:
Non instrusive bandwidth estimation method
System of bandwidth estimation of the APs
Uses regular data traffic
Estimated bandwidth of APs on different channel too
Estimates bandwidth of All the APs
Based on OpenFlow
Allows to conenct multiple APs
and switch to the one which which has lowest Overhead
While Probing
Scans the best AP for long
and other APs for less time
Testbed evaluation
dynamic selection improves the throughput by 81%
as compared to static selection
Interference:
Mean throughput gain of 85% under interference
When mobile
MEan Throughput increases by 176% on an average
The Available bandwidth depends on
Channel Load
Signal Quality
They analyze how theses factor vary randomly over time
and why frequent measurement is neccesary
Claims:
No clear Relationship between RSSI and Packetloss
Question:
General:
How to be conneced to mmultiple AP
Process:
based on Mathematical Model:
Availalbe air time
statics on individual frame loss and PHY rates
sends the information to the controller
controller keeps the check on bandwidth of each AP
how its dynamic:
Scheduler in the STA decides how long to communicate with each AP
STA provids fast channel switching
{fast cahnnel switching- whcih take 1ms}
pre association
pre authentication