Abstract
Recent advances in mobile ad-hoc networks (MANET) technologies promote new opportunities for anytime and anywhere impromptu collaboration and leverage the provisioning of novel collaborative services, such as emergency rescue, e-care, and troop car management. However, the design and deployment of collaborative services in MANET environments raise new group management challenges. In particular, unpredictable users/devices mobility, frequent disconnection/reconnection of devices and continuous changes in network topology call for novel middleware solutions to handle properly the transient and dynamic formation of ad-hoc groups. The paper proposes a context-aware group membership middleware (AGAPE) that bases group management decisions depending on context information, such as user location, user attributes and preferences, and access device properties. User location determines the scope of group member visibility within a network locality, whereas user requirements and device properties govern the joining to a group and influence the played role of a user within a group. AGAPE provides a set of support services to arrange/dissolve and manage ad-hoc groups on demand and propagates the visibility of available group members and of their context up to the application level to allow applications to adapt collaborative decisions and actions accordingly. The paper also presents a MANET-enabled emergency rescue application scenario to show and to evaluate the functioning of AGAPE.