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N E T W O R K E D S U R F A C E S James Scott and Frank Hoffmann {jws22, fh215}@cam.ac.uk - page 11 / 13

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Laboratory for Communications Engineering

Engineering Department

University Of Cambridge

AT&T Laboratories

CAMBRIDGE

Data Transport

Low bandwidth devices: Present as “virtual” serial ports

e.g. Palm Pilot, keyboard, modem

High bandwidth devices: Will have TCP/IP stacks

But TCP performs badly in presence of disconnection

It wrongly assumes losses are due to congestion, and backs off

Could modify TCP to include “Disconnected” state

Instead, make link layer “smart”, by re-sending packets on behalf of TCP when connections are re-established

“Kicks” TCP into action, without waiting for exponential timeout

Saves having to re-implement TCP for every object

Mobile IP/IPv6 can handle movement between surfaces

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