Yang Chen

Publications (2)0 Total impact

• Conference Proceeding: Multicasting in sparse MANETs using message ferrying

  Yang Chen, Jeonghwa Yang, Wenrui Zhao, M. Ammar, E. Zegura
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  ABSTRACT: Multicast is an essential service in mobile ad hoc networks (MANETs). Numerous protocols have been proposed but none of them is directly applicable in sparse MANETs, which are a form of disruption/delay tolerant networks (DTNs). In this paper, we consider multicasting in sparse MANETs with focus on two data dissemination schemes, epidemic routing (ER) and message ferrying (MF). With necessary group management schemes, both schemes can be extended for multicast. However, their performance is scenario-dependent. With this observation, a set of multicast protocols combining the essentials of MF and ER are proposed. In particular, we propose adaptive protocols targeting a balance between transmission efficiency and timely delivery in different scenarios. With simulations, we evaluate the performance of these protocols
  Wireless Communications and Networking Conference, 2006. WCNC 2006. IEEE; 05/2006
• Conference Proceeding: Ferry replacement protocols in sparse MANET message ferrying systems

  Jeonghwa Yang, Yang Chen, M. Ammar, Chungkee Lee
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  ABSTRACT: The message ferrying (MF) scheme has been proposed as a strategy for providing connectivity in sparse partitioned ad hoc networks. A set of nodes, called ferries, are responsible for carrying messages for all nodes in the network. A ferry periodically moves around the deployed area along a pre-determined route and relays messages between mobile nodes which otherwise cannot communicate with each other directly. The MF scheme relies on the ferry to provide connectivity and is vulnerable to a single point of failure. Also, mobile nodes might take turns to be a ferry since they normally have limited resources. Therefore, ferry replacement is important for robustness in MF deployment. We propose two ferry replacement protocols: in the designation scheme, the ferry designates its successor; in the distributed election approach, nodes collaborate and elect one node among themselves as the ferry replacement. We evaluate the performance of these two replacement protocols through comprehensive simulation.
  Wireless Communications and Networking Conference, 2005 IEEE; 04/2005