Adaptive scheduling for wireless video transmission in high-speed networks

With the increase of wireless bandwidth, wireless video applications become more and more popular. A high speed core network is needed for large-scale applications to collect video from wireless terminals in a distributed way. It is necessary to guarantee video transmission in wireless networks because video data should be firstly transmitted via wireless channel. Since wireless bandwidth is still limited and fluctuates frequently, it is difficult to protect wireless video transmission. In this paper, we propose an adaptive cross layer scheduling schema to reduce video transmission distortion in IEEE 802.11e networks. Firstly, it is preferred to insert each video frame into the access category (AC) with minimum relative queuing delay to reduce transmission delay. Secondly, a dynamic frame assignment algorithm (DFAA) is proposed to guarantee the transmission of high priority frames efficiently, with the constraint of limited bandwidth. Finally, each parameter of DFAA is equipped with a fuzzy logic controller which can produce appropriate adjustment to reply quickly to the variation of video data rate, coding structure and network load. Extensive simulation results are presented to validate the effectiveness of our proposed scheme.