Uplink Resource Allocation for Video Transmission in Wireless LAN System

Abstract

Various applications have been realized by wireless communications. Especially, applications using ultra-high-definition video transmission are attracting attention. There is an increasing demand for ultra-high-definition video transmission over uplink in these applications. Such large-capacity uplink traffic plays an important role not only in mobile phone networks but also in private networks such as wireless local area network (LAN). In wireless LAN systems, uplink transmission access schemes are broadly divided into (a) uplink transmission based on carrier sense multiple access with collision avoidance (UL CSMA/CA) and (b) trigger-based access. From the viewpoint of video transmission, trigger-based access, which can control the transmission timing, is more suitable than UL CSMA/CA, which cannot control the transmission timing. However, even if trigger-based access is performed, highly demanding applications such as ultra-high-definition video transmission cause a problem that increasing the capacity of wireless communication systems does not directly bring to the realization of applications. Therefore, we consider that it is necessary to evaluate video throughput, which is based on the criteria whether requirements for ultra-high-definition video transmission have been satisfied, instead of the bit throughput, which is calculated from bits received correctly. In this paper, we consider the video throughput and propose uplink radio resources allocation using application proportional fairness to utilize radio resources efficiently for video transmission. Computer simulation shows that our proposal can significantly improve the video throughput compared with a typical radio resource allocation scheme, proportional fairness.