Modelling and Analysing the Contract Net Protocol - Extension Using Coloured Petri Nets

Authors:
Jonathan Billington;Amar Kumar Gupta;Guy Edward Gallasch
Affiliations:
Computer Systems Engineering Centre, University of South Australia, Australia 5095;Computer Systems Engineering Centre, University of South Australia, Australia 5095;Computer Systems Engineering Centre, University of South Australia, Australia 5095
Venue:
FORTE '08 Proceedings of the 28th IFIP WG 6.1 international conference on Formal Techniques for Networked and Distributed Systems
Year:
2008

Citing 8
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Abstract

The Contract Net Protocol is a task allocation protocol that facilitates negotiation between bidders and an auctioneer in a Multi-Agent System to form a contract. The extension allows the bidders to interact with more than one auctioneer concurrently, and to update their bids until a bid is granted. This introduces flexibility and ensures better selection of a bid. In this paper, we model the Contract Net Protocol - extension with Coloured Petri Nets and show that it terminates correctly. We analyse the terminal states and prove that the agents have consistent beliefs at the end of the negotiations, and that there is no "dead code" in the procedures. Lastly, we show how the number of terminal states and channel bounds are related to the number of bidders.