(Georgia Institute of Technology, 2009)
Liu, Ling; Pu, Calton; Wang, Yuehua; Zhang, Gong
In this paper, we present GeoCast, a geographical location aware overlay network framework
designed for providing efficient group communication services. GeoCast can be seen as an extension
to the CAN network in the term of topology management and routing protocol. Geocast design has
three important properties that attractive to group communication applications. First, it uses geographical
mapping of nodes to regions to take advantage of the similarity between physical and network proximity.
Second, a shortcut enabled geo-distance routing protocol is employed in GeoCast, which is more resilient
than Chord-like or Pastry-like overlay networks due to the availability of multiple independent routing
paths. Third and most importantly, a novel routing table management scheme is designed to allow
the applications based on that have ability to manage their maintenance overhead in terms of network
resource constrains.
(Georgia Institute of Technology, 2004-05-03)
Zhang, Jianjun; Liu, Ling; Pu, Calton; Ammar, Mostafa H.
This paper presents PeerCast, a reliable and self-configurable peer to peer system for End System Multicast (ESM). Our approach has three unique features compared with existing approaches to application-level multicast systems. First, we propose a capacity-aware overlay construction technique to balance the multicast load among peers with heterogeneous capabilities. Second, we utilize the landmark signature technique to cluster peer nodes of the ESM overlay network, aiming at exploiting the network proximity of end system nodes for efficient multicast group subscription and fast dissemination of information across wide area networks. Third and most importantly, we develop a dynamic passive replication scheme to provide reliable subscription and multicast dissemination of information in an environment of inherently unreliable peers. We also present an analytical model to discuss its fault tolerance properties, and report a set of initial experiments, showing the feasibility and the effectiveness of the proposed approach.