Bandwidth Adjustable DVTS on the Heterogeneous Internet Environments for Distance Learning

We propose a new schematic design for sending and receiving a digital video stream on the heterogeneous Internet environment such as a Gigabit Ethernet and a narrow bandwidth satellite link. On such network, a sender can send the full 30fps digital video stream, but not all sites can receive a full quality video. In our proposed scheme, a DVTS repeater named Dvrelay is introduced to reduce frame rate of a DVTS stream going through it. To receive site-aware quality of DVTS stream, Dvrelay can be set up at the nearest point to the receiver site and it can thin out frames to adjust the transmission rate for the narrow bandwidth environment. With this scheme, it is not necessary to modify DVTS sender and receiver. Therefore, it can apply to any DVTS environments and adjust traffic according to capacity of the network links available to recipients. Consequently, all sites in the Internet can receive the site-aware best quality of digital video stream. Then all sites in the Internet can receive the lecture with the quality of the digital video