Shuju Wu

Learn More
— Recently, we have proposed to employ gossiping to place nodes in an ad hoc network in an energy saving sleep state via a Gossip-based Sleep Protocol (GSP) [1]. A gossiping node employs a random variable (p) to decide whether or not to enter a sleep mode. Our observation is that in a well connected ad hoc network there are usually many paths existing(More)
Overlay multicast protocols should adapt to the dynamic network environment to maintain application performance. We show how end-to-end network metrics can be used in the dynamic adaptation and thus improve the performance of the direct-tree overlay multicast protocols while providing good tree quality. We propose the adaptive overlay multicast (AOM)(More)
In reliable multicast applications, packet loss needs to be reported by having group members send feedback messages. This results in the well-known feedback implosion problem. The available feedback control mechanisms can be classified as timer-based, hierarchy-based and router-assisted, among which the timer-based approach is more preferable due to its(More)
—Reliable multicast applications use feedback messages to report receiving status of receivers. This results in the well-known feedback implo-sion and scalability problems. Also, quick loss response from receivers and low multicast overhead, e.g. control messages and session messages, are desired. We present a feedback implosion control mechanism that(More)
In reliable multicast applications, packet loss needs to be reported by having group members send feedback messages. This results in the well-known feedback implosion problem. The available feedback control mechanisms can be classified as timer based, hierarchy based, and router assisted, among which the timer-based approach is more preferable due to its(More)
This paper presents the transient performancestudy on the adaptability of an application layer multicastprotocol, namely Adaptive Overlay Multicast (AOM). The studyfocuses on how the application layer multicast tree structure adapts to network dynamics and faults by using efficient tree management and adaptation algorithms, thus reducing the adverse effects(More)
— Recently, we have proposed an energy saving Gossip-based Sleep Protocol (GSP) [1] for energy conservation in mobile ad hoc networks. A gossiping node employs a random variable (p) to decide whether or not to enter a sleep mode. Our observation is that in a well connected ad hoc network there are usually many paths existing between a source and a(More)