Improvement of Segment Length Selection Method for DASH Considering Shared Bottleneck Links

Video distribution services have become widespread and are used by many people. Therefore, the shared link becomes a bottleneck, and the quality of experience (QoE) deteriorates. Therefore, DASH (Dynamic Adaptive Streaming over HTTP) is used to maintain QoE by dynamically selecting image quality. A conventional method improves QoE by dynamically selecting the playback time (segment length) of one segment by calculating the variation of client throughput in addition to the selection of image quality. However, the segment at the beginning of playback did not calculate the throughput variation properly, and the QoE decreased due Åto inappropriate segment length selections. In this paper, we propose a method to improve the QoE by selecting the segment length at the beginning of playback using the bandwidth of the bottleneck link and the number of connected users, which can be measured in advance, and by changing the derivation method of the throughput variation.