terena networking conference 2010

Hybrid Adaptive Mobile Multicast — The H∀Mcast Approach of Unified Access to Future Services

Matthias Waehlisch (Freie Universitat Berlin), Thomas C. Schmidt (HAW Hamburg)

The Internet revolution introduced a single, adaptive abstraction layer for global communication. Today, IP interconnects millions of applications, which themselves are bound to the present IP layer via the socket API. After almost 30 years, the time has come to abandon this focus on a single, homogeneously established Internet protocol and thereby release the accumulated needs for innovation on the network layer. H∀Mcast addresses this goal by following the evolutionary approach of a hybrid multiservice network layer that decouples service and application develop- ment from infrastructure deployment. The objective of our work is a universal, robust service access that allows group applications to run everywhere, no matter what the status of regional technological deployment will be. To implement the H∀Mcast system architecture, we designed an adaptive, modular service middleware, that integrates the group communication stack presented in [1]. Besides multicast specific calls, the middleware provides basic functionality for (a) service discovery, (b) service selection, and (c) gateway discovery. To provide straightforward multicast service access for any group application we adopt the multicast API described in [2]. The system architecture is diysplayed in Figure 1. Following these concepts, novel services may be created as multi-layered components that form parts of an adaptive middleware. Encapsulated by high-level APIs, application-driven service establishment may proceed rapidly, independent of ISP awareness and without the need of globally upgrading the network. H∀Mcast targets at building such a sample service component for group communication. Emerging popular applications like IPTV and MMORGs urge the need for multicast. At the same time many traditional and mobile systems would largely benefit from ease and efficiency of a network group service. A uniformly accessible multicast service will offer the chance to replace proprietary workarounds deployed in manifold ways, and at the same time it may serve as a complex, challenging test case for the multiservice architecture designed in H∀Mcast . Keywords: Internet service architecture, P2P overlay multicast, hybrid architectures, mul- ticast mobility management, multicast security.

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