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Experiments with Protocols for Service Negotiation ∗

By Costin Bădică and Mihnea Scafes


Abstract. In this paper we provide experimental results concerning the impact of the negotiation protocol onto the quality of the negotiation outcome as well as onto the communication complexity of interactions incurred during negotiations. We evaluate experimentally three negotiation protocols (Direct Task Assignment, Contract Net and Iterated Contract Net) with respect to two performance measures: negotiation outcome (i.e. utility) and communication complexity (i.e. number of messages transferred), by assigning different busy profiles to the contractors. We find that the Direct Task Assignment delivers the worst average outcome, but at the same time it uses the lowest number of messages. The Contract Net and Iterated Contract Net deliver much higher utility on average, but the Iterated Contract Net obtains the highest outcome for some configurations at the cost of the highest number of messages.

Year: 2014
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