基于D2D多播通信的合作内容下载机制  

Cooperative content downloading scheme based on D2D multicast communications

作　　者：杨莲新 吴丹 袁峰 乐超 富勤学 YANG Lianxin;WU Dan;YUAN Feng;YUE Chao;FU Qinxue(College of Communications Engineering,Army Engineering University,Nanjing 210007,China)

机构地区：[1]陆军工程大学通信工程学院,江苏南京210007

出　　处：《通信学报》2020年第11期64-73,共10页Journal on Communications

基　　金：江苏省杰出青年基金资助项目(No.BK20180028);国家自然科学基金资助项目(No.61671474);江苏省优秀青年基金资助项目(No.BK20170089)。

摘　　要：针对蜂窝网、车联网等网络中用户的内容下载场景,提出了一种基于终端直通(D2D)多播通信的合作内容下载机制改善下载性能。该机制充分利用内容请求者位置的邻近特性,将其分成不相交的簇。簇内的内容请求者合作从基站处下载一份完整的内容,并轮流向簇内其他内容请求者共享所下载的内容。这种下载方式下,内容共享额外消耗的资源由簇内内容请求者共同承担。在此过程中,提出了一种定价方法来激励内容请求者间的合作。该方法仅需要基站维持一个内容下载的价格。基于此,为最小化内容请求者的下载代价,研究了用户分簇、链路调度和功率分配的联合优化问题。为以较低的复杂度得到较优的解,基于联盟形成博弈设计了一个联合优化算法。仿真结果表明,相较于传统非合作机制,内容请求者在所提机制下的下载代价降低了约37.15%;在不同数目的内容请求者和蜂窝用户下,所提机制均优于其他基准机制。Aiming at the content downloading scenario in the network such as cellular network and vehicular network,a cooperative content downloading scheme based on device-to-device multicast communications was proposed to improve the content downloading performance.Such a scheme took advantage of the proximity feature of the content requesters and groups them into disjoint clusters.Firstly,the base station delivered the entire content to a cluster,and each content requester in a cluster downloaded a proportion of the entire content.Then,the content requesters took turns sharing their downloaded content with other content requesters in the same cluster.In this way,the additional resource consumption of content sharing in a cluster was shared by the content requesters in the cluster together.During this process,a pricing-based approach was proposed to motivate these content requesters to cooperate with each other.Such an approach only required the base station to maintain a content downloading price.Based on this,the joint issue of user clustering,link scheduling and power allocation was studied to minimize the total cost of content requesters.To obtain a superior solution with reductive complexity,a joint optimization algorithm was designed based on the coalition formation game.Numerical results show that compared with the traditional non-cooperative scheme,the total cost of content requesters was reduced by 37.15%.Under different numbers of content requesters and cellular users,the proposed scheme is both superior to other benchmark schemes.

关 键 词：内容下载 用户分簇 链路调度 功率分配 联盟形成 

分 类 号：TN929.5[电子电信—通信与信息系统]