Abstract

Grid computing infrastructures and applications are increasingly diverse with networks ranging from very high bandwidth optical networks to wireless networks and applications ranging from remote visualization to sensor data collection. For such environments, standard transport protocols such as TCP and UDP are not always sufficient or optimal given theirfixed set ofproperties and their lack offlexibility. As an alternative, we present H-CTP, a highperformance configurable transport protocol that can be used to build customized transport services for a wide range of Grid computing scenarios. H-CTP is based on an earlier configurable transport protocol called CTP, but with a collection of optimizzations that meet the challenge of providing configurability while maintaining perfornnance that meets the requirements of such demanding applications. This paper motivates the needfor customizable transport in this area, presents the design of H-CTP, and gives results from performance studies that compare H-CTP with both CTP and TCP. These show, for example, that H-CTP is able to achieve throughput of over 900 Mbps across Gigabit links. Three diverse Grid scenarios are used as example applications and for the H-CTP/TCP comparisons: remote visualization, fast message passing, and sensor grids.

No abstract

No abstract

A hospital's mobile nursing cart can collect clinical data via Wi-Fi networks and save data in the server side. This service not only provides better medical care, but also enhances staff productivity. However, the coverage of Wi-Fi is limited and signal dead ends will result in wireless disconnection. This problem can be solved by switching between Wi-Fi and 3G. The physical connection must be disconnected and be reconnected again. Therefore, it is interesting to design a mechanism to keep the physical connection continuous. This research designs a Stream Control Transmission Protocol Tunnel (SCTP-Tunnel) middleware. This middleware can be used to build a tunnel between client and server sides such that the SCTP packets can carry the TCP packets and solve the problem of disconnection caused by the one-to-one TCP. The proposed SCTP-Tunnel is compatible with IPv4 and IPv6 and can be adopted without modifying the applications. This design utilizes the SCPT packet acknowledge and multi-homing mechanisms to achieve network fault tolerance. It is feasible to provide a tunnel service via the SCTP-Tunnel and connect to service indirectly without changing the original system architecture to approach the Wi-Fi and 3G switching seamlessly. Such a service will also provide quality long-term healthcare services in the healthcare enterprise.