Service quality optimisation scheme of mobile video stream service

Abstract

In video stream service over wireless and mobile network, issue of limited network resource need to be addressed in order to assure acceptable service quality. From the perspective of network resource supply, network operator attempts to address the issue by increasing network capacity. In contrast, from the perspective of network demand, service provider concentrates on using the network resource efficiently according to necessity of application or service. However, determination of network necessity is not trivial due to intermingled correlation between Quality of Service (QoS) parameters and network Channel Quality Indicator (CQI). Moreover, determination of network necessity is also associated with quality of experience. This study develops service quality scheme that elucidates the correlation among QoS parameters. This basic scheme consists of two methods, generation of video test materials and Objective Video Quality Measurement (OVQM). The videos are generated with different configuration of QoS parameters. The OVQM quantifies the videos' quality and objectively screens acceptable videos. The scheme produces Look Up Table I (LUT I) that lists configuration of QoS parameters of the acceptable video quality. In order to accommodate the quality of experience factors, the scheme is enhanced to include Subjective Video Quality Assessment (SVQA) method. SVQA method is an assessment survey to obtain user feedback of acceptable video quality listed in LUT I. The enhanced scheme has produced Look Up Table II (LUT II). This LUT II shows configuration of QoS parameters that objectively and subjectively fulfil the video quality. The proposed schemes along with both LUTs can be adopted by network operators and other service stakeholders to allocate more efficient network resource for an acceptable quality. In addition, methods used in the development of the schemes are general enough for further investigation of network resource allocation for any mobile multimedia service.