The Architecture and Protocol Design for Underwater Network

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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-to-peer 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
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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

• 425 Nodes
• Randomly distributed
• Random traffic (Poisson Arrival)

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• 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?