Download The Architecture and Protocol Design for Underwater Network

The Architecture and
Protocol Design for
Underwater Network
Presented by James
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Original Papers
• S. Shahabudeen and M. Chitre, "Design of
networking protocols for shallow water peer-topeer acoustic networks," in Proceedings of IEEE
Oceans'05 Europe, Brest, France, 2005.
• Mandar Chitre, Lee Freitag, Ethem Sozer, Shiraz
Shahabudeen, Milica Stojanovic, John Potter, "An
Architecture for Underwater Networks",
OCEANS'06 IEEE ASIA PACIFIC
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Presentation Outline
• Underwater Network Architecture
• Design of Networking Protocols
• Discussions
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Underwater Network
Architecture (UNA)
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Overview
• Guidelines:
– Underwater networking;
– Easy integration;
– Flexible;
– Simple.
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Layered Model
Logically
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Addressing
• Unique
• Network ID + Node ID
• Broadcast Address: FFFF
• No DHCP
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Transport Layer
• Services:
– Connection Oriented
– Datagram
• Messages:
–
–
–
–
–
–
Open REQ
Close REQ
Write REQ
Connection Established NTF
Connection Lost NTF
Incoming Data NTF
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Network Layer
• Services:
– Routing
– Reliability (optional)
• Messages:
– Send Packet REQ
– Incoming Packet NTF
– Get Route REQ
– No Route NTF
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Data Link Layer
• Services:
– Single hop data transmission
– Error detection
– MAC (for shared media)
• Messages:
– Send Packet REQ
– Incoming Packet NTF
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Physical Layer
• Services:
–
–
–
–
–
Framing
Modulation
Error correction
Parameter negotiation
Carrier sensing
• Messages:
– Send Packet REQ
– Incoming Packet NTF
– Recommend Parameters REQ
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Extension Framework
• Cross layer optimization
• Exists across all layers
• Services:
– Check capabilities
– Generic data query
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UNA Framework API
• An abstract of hardware and OS
• Follows standard C language
• Supports message queue
• Services:
– Layer registration
– Message queue
– Timer
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Quick Summary
• A common framework
• A layered architecture
• Some extended features
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Presentation Outline
• Underwater Network Architecture
• Design of Networking Protocols
• Discussions
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Design of Networking
Protocols
• Goals
– Present some results
– Looking for proper protocols
• Target layers
– Data link layer
– Physical layer
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Protocols
• MAC0
– ALOHA based half duplex protocol
• MAC1
– ALOHA based half duplex protocol with
ACKs and retries
• MAC2
– MACA based half duplex protocol using
RTS/CTS handshaking
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Simulation Scenarios
• 4~25 Nodes:
• Randomly
distributed
• Random traffic
(Poisson Arrival)
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AverageSent / SimulationTime
OfferedLoad 
BitRate / PacketLength
AverageReceived / SimulationTime
Throughput 
BitRate / PacketLength
• Orthogonal channel
– Bandwidth divided channel
• Non-Orthogonal Channel
– Shared channel
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Simulation 1
• Throughput v/s Offered load for
various packet sizes
– Bit rate: 2400bps
– Constant packet length
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Simulation 2
• For fixed offered load, compare the
throughput for various bit rate rates and
packet lengths
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Simulation 3
• For fixed offered load, study throughput
variation with respect to number of nodes
– Packet size: 4000 bits
– Bit rate: 2400 bps
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Simulation 4
• For fixed offered load, study the throughput with
respect to the node separation
– Packet size: 4000 bits
– Bit rate: 2400 bps
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Conclusions
• Non-orthogonal schemes are good
candidates
– Lower system complexity
– Could conserve power
– Good performance
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Presentation Outline
• Underwater Network Architecture
• Design of Networking Protocols
• Discussions
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Discussions
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Is Five-layered Model
Suitable?
• Redundancy:
– Fragmentation
• Is performed through out transport layer, network
layer, and datalink layer!
– Checksum
• Is calculated in MAC layer (32-bit CRC), IP layer and
transport layer (16 bits). Can we just combine the
later two together?
– Address
• Can we use one address instead of assigning every
layer an address?
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Thanks!
Questions?
Comments?
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