Innovative transport protocols
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Prof. Paul Amer CISC Department. Protocol · Engineering · Laboratory. Innovative Transport Protocols. Current Students Armando Caro Jana Iyengar Ryan Bickhart Mark Hufe Brad Durandetta Preethi Natarajan. Transport. UDP. TCP. SCTP. DCCP. UDP lite. UDP. TCP. SCTP. DCCP.

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Innovative Transport Protocols

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Prof. Paul Amer

CISC Department

Protocol · Engineering · Laboratory

Innovative Transport Protocols

  • Current Students

  • Armando Caro

  • Jana Iyengar

  • Ryan Bickhart

  • Mark Hufe

  • Brad Durandetta

  • Preethi Natarajan


Transport

UDP

TCP

SCTP

DCCP

UDP lite

UDP

TCP

SCTP

DCCP

UDP lite

IP

IP

IP

IP

IP

IP

IP

CHAOS !

Innovative Transport Protocols

Application

Application


Designing a new application Research: On top of “ideal” transport protocol

Application

menu of transport

protocols/services

TCP

Transport

Layer

SCTP

UDP


TCP

SCTP

A1

B1

ISP

ISP

Internet

A2

B2

ISP

ISP

Stream Control Transmission Protocol (SCTP) Multihoming

Key Research Problems:

  • fault tolerance

  • concurrent multipath transfer (load sharing)

Why is multihoming new and exciting?

- multihoming is just now happening on wide scale


Multi-streaming

voice

video

tactical info (e.g., gps, supply levels)

images (e.g., maps, radar)

Issues: synchronization, congestion control, flow control


Multistreaming

sender app

receiver app

s2

s1

s4

s3

s3

s4

s1

s2

multistreaming transport

IP

DLL

PHY


1. create A

3. create B

4. create C

2. modify A

4. create C

3. create B

3. create B

1. create A

2. modify A

4. create C

2. modify A

1. create A

transport

transport

Unordered / Partial Order

(RFC1693 An Extension to TCP: Partial Order Service

Connolly, Amer, Conrad, Nov 1994)


“Undo” or “Expire”

Real time

game

Real time

game

position

updates

transport

transport


50

10

9

8

7

6

5

4

3

2

1

10

9

8

50

5

3

1

acceptable

 3 frames/sec

9

7

1

50

10

5

3

unacceptable

< 3 frames/sec

retransmissions

Controlled / partial reliability

10 second video

5 frames/sec


left 30º

20mph

stop

Reliable & time critical

  • Commands to robot

    • must be reliable AND delivered within a bounded delay

  • Mechanisms

    • Send multiple copies (ie “retransmit before loss” to increase probability of receipt)

    • Send multiple copies out different interfaces (assuming multihoming)

    • Use Forward Error Correction (FEC)

unmanned vehicle


  • $3.5M ($5.5M)

  • CIS

    • Amer

    • Sethi

    • Lloyd

    • Shen

    • Pollock

  • ECE

    • Arce

    • Boncelet

    • Mills

    • Xia

    • Garcia-Frias

Army Research Lab (ARL)Collaborative Technology Alliance (CTA)in Communications and Networks

  • 5 (8) years

  • $44M ($76M)

  • Army Scientists

  • Industry

    • Telcordia

    • BAE Systems

    • General Dynamics

    • McAfee

    • BBN

  • Primary Universities

    • Delaware

    • Maryland

    • Princeton

    • Johns Hopkins

    • Georgia Tech

    • Minnesota

    • Morgan State

    • CCNY

    • Clark Atlanta

  • Secondary Universities

    • Washington

    • Cornell

    • UC Riverside

    • Michigan

    • New Mexico State

    • UCal- Davis

and Cisco Systems, IncUniversity Research Program


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