arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.10633cs.NIcs.CL
收藏

随机缓存多层异构网络中多质量视频服务延迟分析与优化

Analysis and Optimization of Service Delay for Multi-quality Videos in Multi-tier Heterogeneous Network with Random Caching

Beijing University of Posts and Telecommunications(北京邮电大学);Commonwealth Scientific and Industrial Research(联邦科学与工业研究组织)

Xuewei Zhang, Tiejun Lv, Yuan Ren, Wei Ni, Norman C. Beaulieu

摘要:

针对设备到设备(D2 D)辅助的异构网络,提出了一种新的随机缓存机制。为了支持多媒体视频服务的多样化观看质量,每个视频文件通过可缩放视频编码(SVC)被编码成基本层(BL)和多个增强层(EL)。包括BL和若干EL的超层被发送到每个用户。当用户由D2 D助手、小小区基站(SBS)和宏小区基站(MBS)服务时,我们通过导出成功传输概率来定义和量化多质量视频的服务延迟。我们制定了一个延迟最小化的问题受到有限的缓存大小的D2 D助手和SBS。揭示了问题最优解的结构,设计了一种改进的标准梯度投影法,有效地求解了问题的最优解。理论分析和Monte-Carlo仿真均验证了成功传输概率。与三种基准缓存策略相比,本文提出的基于SVC的随机缓存策略在降低服务延迟方面具有优势。

英文摘要:

Aiming to minimize service delay, we propose a new random caching scheme in device-to-device (D2D)-assisted heterogeneous network. To support diversified viewing qualities of multimedia video services, each video file is encoded into a base layer (BL) and multiple enhancement layers (ELs) by scalable video coding (SVC). A super layer, including the BL and several ELs, is transmitted to every user. We define and quantify the service delay of multi-quality videos by deriving successful transmission probabilities when a user is served by a D2D helper, a small-cell base station (SBS) and a macro-cell base station (MBS). We formulate a delay minimization problem subject to the limited cache sizes of D2D helpers and SBSs. The structure of the optimal solutions to the problem is revealed, and then an improved standard gradient projection method is designed to effectively obtain the solutions. Both theoretical analysis and Monte-Carlo simulations validate the successful transmission probabilities. Compared with three benchmark caching policies, the proposed SVC-based random caching scheme is superior in terms of reducing the service delay.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑