Expressiveness of point-to-point versus broadcast communications

  • Cristian Ene
  • Traian Muntean
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 1684)


In this paper we address the problem of the expressive po- wer of point-to-point communication to implement broadcast communication. We demonstrate that point-to-point communication as in CCS [M89] is “too asynchronous” to implement broadcast communication as in CBS [P95]. Milner’s π-calculus [M91] is a calculus in which all communications are point-to-point. We introduce bπ-calculus, using broadcast instead of rendez-vous primitive communication, as a variant of value-passing CBS in which communications are made on channels as in Hoare’s CSP [H85] — and channels can be transmitted too as in π-calculus — but by a broadcast protocol: processes speak one at a time and are heard instantaneously by all others. In this paper, using the fact that π-calculus enjoys a certain interleaving property, whereas bπ-calculus does not, we prove that there does not exist any uniform, parallel-preserving translation from bπ-calculus into π-calculus, up to any “reasonable” equivalence. Using arguments similar to [P97], we also prove a separation result between CBS and CCS.


Output Action Electoral System Operational Semantic Label Transition System Broadcast Protocol 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • Cristian Ene
    • 1
    • 2
  • Traian Muntean
    • 1
  1. 1.Laboratoire d'Informatique de Marseille (LIM-CNRS)University of MarseilleMarseilleFrance
  2. 2.Faculty of Computer ScienceUniversity “Al. I. Cuza”IasiRomania

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