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무선 LAN의 QoS 지원을 위한 Linux Queuing Discipline 설계 및 구현
IEEE 802.11e from IEEE 802.11 Working Group was standardized to support QoS on the wireless LAN environment. However, pfifo_fast which is provided from the default Queuing Discipline on Linux does not support QoS because of the following issues. First, the priorities provided by pfifo_fast is different from that of IEEE 802.11e. Second, pfifo_fast drop a packet by Drop Tail scheme. Drop Tail scheme drop a packet regardless of it's priority. Therefore it can drop QoS applied packet. The pfifo_QoS Queuing Discipline that is improved from the pfifo_fast is proposed in this paper. pfifo_QoS priorities was reconcile with the priorities provided by IEEE 802.11e. Also pfifo_QoS work, by a method of priority-based Early Drop not by Drop Tail. To validate the performance of pfifo_QoS proposed in this paper, pfifo_fast and GRED were compared through experiment. The performance of the pfifo_QoS has increase 69.6% compare to pfifo_fast and 22.5% compared to GRED on average.
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DASH 기반 초고품질 적시 방송을 위한 전송 모델 및 지연 감소 방안
The convergence of broadcasting and communication networks is in progress actively. However, broadcast system uses a dedicated broadcast technology such as MPEG2-TS, it is obstacle to the broadcast/communication convergence. ATSC 3.0 is a next-generation terrestrial broadcast standard that transmits UHD media content by DASH segment file. ATSC 3.0 uses IP/DASH technology for broadcast/communication convergence. The size of DASH segment files varies even though they have the same quality and playback time. The amount of UHD media data is larger than that of HD media data. Terrestrial broadcasting resources are increasing with the development of technology. However, the bandwidth of ATSC 3.0 is limited than the wired or broadband bandwidth. Also, broadcast system transmits media contents by Constant Bit Rate (CBR). Therefore, there are problems such as delays and resource efficiency when the segment files with large variability are transmitted through the terrestrial broadcasting. This paper suggests the time bound traffic model to derive the delay from DASH traffic. This paper also suggests the delay reduction techniques and show the results of the delay reduction.
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