Study of necessary number of simultaneous TCP connections in Web client by Web-QoE assessment

This paper studies the necessary number of simultaneous TCP connections in a Web client for high Web-QoE. Currently, many Web browsers use multiple TCP connections simultaneously for effective data transmission. However, more simultaneous TCP connections make more establishments/closes of connections and do not always give higher quality of a Web service because users often access to the Web services interactively. Moreover, increase of simultaneous TCP connections causes high load of a Web server. That is, there exist a necessary number of simultaneous TCP connections. The authors assess the necessary number of TCP connections for an online shopping Web service by experiment; here, they utilizes two psychophysical methods: the rating scale method and the method of the limit. From experimental results, they show that the necessary number of simultaneous TCP connections for high TCP throughput is not always the same as that for high Web-QoE.