CAJ | 학술논문

实时流业务的超期丢包率是衡量无线网络传输过程服务质量的常用参数,但是该参数并不能反映出具有不同重要度的数据包对视频质量的影响.该文将实时传输流的数据包重要度与超期丢包率结合,提出加权超期丢包率的概念,更加准确地描述丢包与视频质量的关系,在无线环境下提出基于数据包不同重要度的适用于实时约束流的主动队列管理算法,通过主动丢弃数据包以最小化服务过程中实时流的加权超期丢包率.仿真结果表明,相比于传统的队列管理算法和实时视频流滤波器算法,该超期数据包主动丢弃算法能够有效降低加权超期丢包率,提供更好的服务质量,提高大约0.5~1.5 dB的峰值信噪比(PSNR)增益.
실시류업무적초기주포솔시형량무선망락전수과정복무질량적상용삼수,단시해삼수병불능반영출구유불동중요도적수거포대시빈질량적영향.해문장실시전수류적수거포중요도여초기주포솔결합,제출가권초기주포솔적개념,경가준학지묘술주포여시빈질량적관계,재무선배경하제출기우수거포불동중요도적괄용우실시약속류적주동대렬관리산법,통과주동주기수거포이최소화복무과정중실시류적가권초기주포솔.방진결과표명,상비우전통적대렬관리산법화실시시빈류려파기산법,해초기수거포주동주기산법능구유효강저가권초기주포솔,제공경호적복무질량,제고대약0.5~1.5 dB적봉치신조비(PSNR)증익.
@@@@The expired-time packet loss rate is a common parameter to measure the quality of service of transmission of deadline-constrained traffic in wireless networks. However, this parameter can not reflect the influence on the quality of service of video caused by the packets with different levels of importance. In this paper, the definition of the weighted expired-time packet loss rate is first introduced with the consideration of the importance of different kinds of packets, which describes the connection between the packet loss and quality of video more specifically. Based on the definition, an active queue management mechanism is proposed, which can be applied to deadline-constrained transmissions in wireless networks, and this mechanism, considering different levels of importance of video packets, drop packets actively to minimize the weighted expired-time packet loss rate during the service. Simulation results show that compared with the traditional queue management mechanism and real-time video filtering mechanism, the active packet discard mechanism can effectively reduce the weighted expired-time packet loss rate and improve the quality of service of video to about 0.5~1.5 dB Peak Signal to Noise Ratio (PSNR) gain.