Qian Zhang and Christopher LIM Department of Computer Science and Engineering, Hong Kong University...
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Transcript of Qian Zhang and Christopher LIM Department of Computer Science and Engineering, Hong Kong University...
Qian Zhang and Christopher LIM
Department of Computer Science and Engineering, Hong Kong University of Science and Technology
IEEE ICC 2009
OutlineIntroductionPerformance of existing channel
assignment metricsEffective Channel Air Time (ECAT)Performance EvaluationConclusion
IntroductionTo improve the system performance in
wireless mesh network (WMN)Multiple channelMultiple radios
The channel assignment for the APs with the access radio will affect the overall systemCity-wide WMN
The mesh APs are densely deployed It will interfere with each other
IntroductionTo proposed a new channel assignment
metricThe Effective Channel Air Time (ECAT)The traffic in the adjacent channels has
been explicitly taken into account The channel condition estimation can be
provided
Testbed configurationsEach of mesh APs associated with 2
clientsClients continuously download tftp data
Experiments on the accuracy of CATTraffic from different adjacent channel
and how it affect the current channel bandwidthAccess radio are set to channel 13
Experiments on the accuracy of CATThe effect of distance between the
transmitting node and interfering node
Experiments on the accuracy of CATThe accuracy of CAT metric
The RSSI of the interfering nodes is of 77-79
Experiments on the accuracy of CATThe accuracy of CAT metric
The RSSI of the interfering nodes is of 59-62
Effective Channel Air Time (ECAT)The experiments demonstrated
CAT channel metric tends to underestimate the channel’s utilization
Effective Channel Air Time (ECAT)It can have a effectiveness channel air
time of channel NThe CAT of that channelThe busy period in its overlapping
channel
21
NNNN BPgBPfCATECAT
The neighboring channels and the neighbor’s neighboring channel
Busy period
factorIMRIRSSICAT
factorIMRIRSSICATCATECAT
iiNNi
i
iiiNNi
iNN
)(
)(
2,2
1,1
Effective Channel Air Time (ECAT)
The maximum RSSI signal measured at the mesh AP
The maximum transmitter’s power measured at transmitter’s channel
Effective Channel Air Time (ECAT)
2,2
1,1
/
/
NNiii
NNiiiiNN
MRIMTPCCAT
MRIMTPCCATCATECAT
The maximum transmitter’s power measured at the channel i