摘要
Wi Fi网络下的视频多播传输问题是目前的研究热点,针对当前视频多播传输方案使得处于区域边界处的用户享受到的服务质量较低、可靠性差这一不足,提出一种基于多访问点(AP)协作的视频多播可靠传输方案。通过在多个AP间展开协作,每个AP可传输完全不同或部分不同的FEC编码报文,多播接收器利用空间和时间分集来提升性能。此外,我们还提出一种支持FEC码率自适应的资源分配算法,有效地提高了有限无线资源的利用率和视频质量。最后,通过全面的仿真实验评估了本文算法的有效性,与传统的单AP点多播算法相比,本文算法使用户满意率提升了37.1%。
Video multicast transmission problem in Wi Fi networks is the research hotspot now. The existing video multicast transmission schemes result in the users located at cell boundaries,and may provide service with poor quality and poor reliability. To solve this problem,this paper proposes a video multicast reliable transmission scheme based on multiple access points（ AP） collaboration. By coordinating multiple APs,each AP can transmit entirely or partially different FEC-encoded packets so that a multicast receiver can benefit from both spatial and time diversities. In addition,we propose a resource-allocation algorithm for FEC-code rate adaptation,utilizing the limited wireless resource more efficiently while enhancing video quality. Finally,the effectiveness of the proposed schemes is comparatively evaluated via extensive simulation and experimentation. The proposed schemes are observed to enhance the ratio of satisfied users by up to 37. 1 % compared to the conventional single AP multicast scheme.
出处
《实验室研究与探索》
CAS
北大核心
2016年第10期127-134,共8页
Research and Exploration In Laboratory
