AL-ARQ algorithm for video streaming in WLAN

Many external factors influence the quality of video-streaming in WLAN and fragments of the video can be lost, delayed or have changed sequence. The potential to improve the quality of the video is to develop methods by their implementation at the application level of the OSI model, which does not entail the need for changing in the standards of the lower level and thus simplifies the implementation process by installing the software on client nodes. Article is devoted to the development and research of the effectiveness of the AL-ARQ algorithm (Application Layer ARQ) to correct the packet losses of streaming video data at the application layer of the OSI model in the WLAN. The quality of video delivery in real time is increased by repeated fragments of lost video data on the application layer of the OSI model. Developed formats of messages are used both for delivery of the video fragments and request for retransmission. We offer the software implementation of the AL-ARQ algorithm. The experimental study of the effectiveness of the AL-ARQ algorithm is performed in a packet losses condition during transmission over WLAN. As a criterion for the effectiveness for the proposed algorithm the packet loss ratio is used. The results prove the effectiveness of the proposed algorithm.