This case study is based on the bounded retransmission protocol (BRP) [HSV94], a variant of the alternating bit protocol.

Its parameters are:

  N = number of chunks in a file
  MAX = maximum number of retransmissions
  TD = the transition delay
  TIME_OUT = the time the sender waits before timing out

TIME_OUT should be greater than the time to send and receive an ack (i.e. greater than 2*TD)

For more information, see the untimed version: http://www.prismmodelchecker.org/casestudies/brp.php

The PTA extension is based on that used in [HH09]

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[HSV94]
L. Helmink, M. Sellink and F Vaandrager
Proof checking a data link protocol
In Proc. Types for Proofs and Programs (TYPES'93), LNCS 806, pp 127-165, Springer-Verlag, 1994

[HH09]
A. Hartmanns and H. Hermanns
A Modest Approach to Checking Probabilistic Timed Automata
Proc. 6th International Conference on Quantitative Evaluation of Systems (QEST'09), IEEE, 2009