异构环境下覆盖网组播算法的研究
发布时间：2019-01-08 16:58
【摘要】：音视频会议等强延迟约束实时多媒体业务是覆盖网组播技术的一个重要应用.随着移动互联网的快速发展,更多的用户期望通过移动终端设备访问这些业务,但现有的覆盖网组播树生成算法不能同时满足终端的异构性和服务延迟约束的需求.为此,提出一种启发式延迟受限覆盖网组播树生成算法.该算法在普通最小延迟组播树的节点中引入了转码能力,同时考虑了移动终端的带宽消耗以及服务延迟等需求,从而能满足链路带宽和节点转码能力约束.仿真实验表明,与Transcasting相比,该算法能够以少量带宽的代价,获得较低的平均服务延迟和较好的组播树健壮性等好处.
[Abstract]:Real-time multimedia services with strong delay constraints such as audio and video conferencing are an important application of overlay multicast technology. With the rapid development of mobile Internet, more and more users expect to access these services through mobile terminal devices, but the existing overlay multicast tree generation algorithm can not meet the needs of both terminal heterogeneity and service delay constraints. Therefore, a heuristic algorithm for multicast tree generation in delay constrained overlay networks is proposed. The algorithm introduces transcoding capability into the nodes of the common minimum delay multicast tree and takes into account the bandwidth consumption and service delay of mobile terminals so as to meet the constraints of link bandwidth and node transcoding capability. Simulation results show that compared with Transcasting, the proposed algorithm can achieve lower average service delay and better multicast tree robustness at a small bandwidth cost.
【作者单位】： 华中科技大学电子与信息工程系;
【基金】：国家自然科学基金项目(60802009)资助 “十一五”国家重大专项(2009ZX03003-003,2010ZX03003-001)资助
【分类号】：TP393.02
[Abstract]:Real-time multimedia services with strong delay constraints such as audio and video conferencing are an important application of overlay multicast technology. With the rapid development of mobile Internet, more and more users expect to access these services through mobile terminal devices, but the existing overlay multicast tree generation algorithm can not meet the needs of both terminal heterogeneity and service delay constraints. Therefore, a heuristic algorithm for multicast tree generation in delay constrained overlay networks is proposed. The algorithm introduces transcoding capability into the nodes of the common minimum delay multicast tree and takes into account the bandwidth consumption and service delay of mobile terminals so as to meet the constraints of link bandwidth and node transcoding capability. Simulation results show that compared with Transcasting, the proposed algorithm can achieve lower average service delay and better multicast tree robustness at a small bandwidth cost.
【作者单位】： 华中科技大学电子与信息工程系;
【基金】：国家自然科学基金项目(60802009)资助 “十一五”国家重大专项(2009ZX03003-003,2010ZX03003-001)资助
【分类号】：TP393.02
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