As a variety of communication devices emerging, we can easily install two or more communication interfaces on a PC or a PDA and make a multi-home environment. To utilize this multi-home environment effectively, SCTP (Stream Control Transmission Protocol) has been proposed and standardized. Extending functions of the original SCTP, a strategy which can adapt SCTP to real-time communications has been proposed. However, the typical existing strategy has not enough considered the switching conditions from the viewpoint of transmission delay, so there is room to improve them. In this paper, we clarify the drawbacks of the existing strategy and their influences on the performance. Then, we propose a new strategy of path switching to reduce the delay and to increase the amount of data successfully delivered. The effect of the proposed strategy is discussed and confirmed through experimental evaluations.
Although the traditional downloading programs usually select one server and retrieves a file from the server, it is more practical to select more servers (e.g. mirror servers) and to fetch different parts of a file from the servers in parallel from the point of view of downloading time and faulttolerance of network service. We have already proposed an adaptive parallel downloading method which enables us to stabilize and accelerate the downloading time even in the network environments with various bandwidth. Since we found a little room for improvement in the method, this paper describes an improved method. The new method has the following features: (1) independence of the number of mirror servers and (2) introduction of request pipelining into parallel downloading. Based on practical experiments from the viewpoint of downloading speed and stability of downloading time, we confirm that the improved method is more effective than the previous methods. There is a possibility that the improved method will become one of the most important network control technologies for network assurance.
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