an improved cdma-based mac protocol for underwater acoustic wireless sensor networks
DESCRIPTION
An Improved CDMA-Based MAC Protocol for Underwater Acoustic Wireless Sensor Networks. Guangyu Fan, Huifang Chen, Lei Xie , Kuang Wang. IEEE WICOM 2011. Introduction. The world's oceans cover over 70 % of its surface Underwater Wireless Sensor Networks (UWSNs). Introduction. - PowerPoint PPT PresentationTRANSCRIPT
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An Improved CDMA-Based MAC Protocol for Underwater Acoustic
Wireless Sensor Networks
Guangyu Fan, Huifang Chen, Lei Xie, Kuang Wang
IEEE WICOM 2011
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The world's oceans cover over 70 % of its surface Underwater Wireless Sensor Networks (UWSNs)
Introduction
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Underwater sensor network technology can be applied in many fields Environment monitoring Geographic data collection Offshore exploration Assisted navigation Disaster prevention Tactical surveillance
Introduction
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Transmission rate WSN: 3 x 108 m/s UWSN: 1500 m/s
Propagation delay
Introduction
A
B
Propagation delay
B A
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Problem Long propagation delay
Introduction
RTS
RTS
RTS
CTS
CTS
DATA
DATA
RTS
CTS
A
B
C
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CDMA-based protocols Transmitter-oriented code assignment (TOCA) Receiver-oriented code assignment (ROCA) Path-oriented code assignment (POCA)
Introduction
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Slotted FAMA
Related works
RTS
RTS
RTS
CTS
CTS
DATA
DATA
RTS
CTS DEFERS TRANSMISSIONS
A
B
C
MaximumPropagation Delay+CTS
Waste time !
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RIPT
Related works
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Disadvantage
Related works
Collision
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In the paper, POCA-CDMA-MAC is proposed for UWASNs. It utilizes a round-robin method and CDMA technology to reduce
collisions of packets.
Goal
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Assumption Sink can receive packets from multiple neighbors at the same time Routes will be built All sensor nodes are equipped with a half-duplex, omni-directional
transceiver
Network environment
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POCA-CDMA-MAC
AP1
BP1
AP2
BP2
CP2 BP3BP4
AP5
BP5
CP5
AP6
BP6
CP6
CP7
Surface station
Sink
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POCA-CDMA-MAC
AP1
BP1
AP2
BP2
CP2 BP3BP4
AP5
BP5
CP5
AP6
BP6
CP6
CP7
Sink
(s1,s2,s3,s4,s5,s6,s7)
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POCA-CDMA-MAC
AP1
BP1
AP2
BP2
CP2 BP3BP4
AP5
BP5
CP5
AP6
BP6
CP6
CP7
Sink
(s2,s3,s4,s5,s6,s7)s1
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POCA-CDMA-MAC
AP1
BP1
AP2
BP2
CP2 BP3BP4
AP5
BP5
CP5
AP6
BP6
CP6
CP7
Sink
(s2,s3,s4,s5,s6,s7)
s1
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POCA-CDMA-MAC
AP1
BP1
AP2
BP2
CP2 BP3BP4
AP5
BP5
CP5
AP6
BP6
CP6
CP7
Sink
(s5,s6,s7)
s1
s2s3
s4
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POCA-CDMA-MAC
AP1
BP1
AP2
BP2
CP2 BP3BP4
AP5
BP5
CP5
AP6
BP6
CP6
CP7
Sink
(s5,s6,s7)
s1
s2s3 s4
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POCA-CDMA-MAC
AP1
BP1
AP2
BP2
CP2 BP3BP4
AP5
BP5
CP5
AP6
BP6
CP6
CP7
Sinks1
s2s3 s4
s5
s6
s7
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POCA-CDMA-MACAP2
BP2
CP2
Sink
CP2
BP2
AP2
Sink
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POCA-CDMA-MACAP2
BP2
CP2
Sink
CP2
BP2
AP2
Sink
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POCA-CDMA-MACAP2
BP2
CP2
Sink
CP2
BP2
AP2
Sink
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POCA-CDMA-MACAP2
BP2
CP2
Sink
CP2
BP2
AP2
Sink
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Problem
POCA-CDMA-MACAP2
BP2
CP2
Sink
CP2
BP2
AP2
Sink
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Solution
POCA-CDMA-MACAP2
BP2
CP2
Sink
CP2
BP2
AP2
Sink
Passing token
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Simulation
Parameter Value
Transmission range 7.5 km
Data packet 500 bytes
Static Nodes 8
Control packet 12.5 bytes
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Simulation
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Simulation
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Simulation
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In the proposed MAC protocol prevent collision of packets and the length of the spreading sequence codes is shortened by using round-robin method CDMA technology
Each node encodes its packets with a spreading sequence, so the sink can receive packets from multiple neighbors at the same time.
Conclusion