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National Computer Symposium 2009National Kaohsiung University of Applied Sciences
BMWLab–Chun-Kuei Hsiung,Wen-Shyang Wang
K-MAC
Outline
2
01Introduction
02
3
Introduction
• WSN application is popular
• Key issue about energy in MAC layer
4
Introduction - Main research in MAC
5
Power Management
Low Duty-Cycle
TDMAContention
basedHybrid
Sleep/Wakeup
Protocols
On-demand
Scheduled rendezvous
Asynchronous
# of Contenders
TDMA
CSMA
IDEAL
02Related Work
02
6
Related Work
7
Cluster based + hybrid access + QoS model
EQ-MACEQ-MAC
Cluster based + multi-channel
COM-MACCOM-MAC
Multi-hop polling
Multi-hop pollingMulti-hop polling
Token based slot assignment But its long time to do, and careless about construct topology issue
FlexiTPFlexiTP
Introduction -Motivation
8
•TDMA•Multi-channel
Enrich resource Enrich resource
• Steal timeslot • low balance
Low power & delay Low power & delay
•Cluster-based WSN
Flexible controlFlexible control
Frame structure
9
…
K-MAC
……
frame
Fault-Tolerant Listening Slot
Data Transmission Slot
MultiFunction Slot
Empty Slot
…
FlexiTPframe
03K-MACExample
Load balance
Reservation
02
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Example
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22
22
55
44
66
55
33
55
55
33 44 44 55
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22
33
44
44
33
44
55
66
22
33
22
22
22
22
55
44
33
22
22
22
66
44
33
33
33
33
66
44
33
33
44
55
44
44
55
55
55
66
55
66
BS
A
B
C
D
E
11
11
11
11
11
11
FTS RSL TSL CSL
44
Load balance
S0
S3
S2S1
S7
S10
S13
S15
S4
S8
S11
S5 S6
S9
S12
S14
12
5 1 3 4
13/2 ＝ 6.55 376
Reservation
13
MFS.reserv(2)
MFS
ACK.reserv(2) Data
Data
Data
Slot 5 Slot 6 Slot 2 Slot 3Slot 1
BSBS
AA
BB
04Simulation
02
14
Initial step
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Running step
16
Multi-channel
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Number of nodes
Max
imum
slo
t nu
mbe
r
Low Balance
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05Conclusion
02
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Conclusion
• Contribution– Prototype of Multichannel– Steal (reservation) mechanism algorithm– Implement mechanism of Load balance
• Future Work– Topology – Position of Cluster-head – Completely – Inter-cluster communication– Performance – QoS issue (scheduling)
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Q&A
