Validation of a Negotiation Protocol for Registry Composition in Ambient Networks

Ambient networks present a new networking concept for beyond 3G. Network composition is a core concept of Ambient Networks. It enables dynamic and uniform interworking between heterogeneous networks, on both control and data planes. The first step towards network composition is the negotiation of the composition details, between all of the functional entities of the control plane (e.g. Mobility, Congestion control). Registry composition entity (RCE) is the functional entity responsible for orchestrating the composition of registries hosted by the composing networks. Indeed, ambient networks can host several registries (e.g. Management Information Base, Context Information Base) and when the networks compose, the hosted registries have also to compose. In previous work, we proposed a framework for dynamic negotiation between RCEs. This framework is based on the assumption that no entity leaves the negotiation when it is started. In this paper, we release this assumption and we extend the proposed negotiation protocol, to take into account nodes departure during the negotiation. We then validate the new protocol using Simple PROMELA Interpreter (SPIN): a software tool for simulating and validating processes in a distributed system.