多媒体文件传输嵌入式终端接收能力的匹配  

Embedded terminal receiving capability matching in multimedia file transmission

作　　者：王海威[1,2] 倪宏[2] 孙鹏[2] 朱小勇[2] 

机构地区：[1]中国科学技术大学中科院网络传播系统与控制重点实验室,安徽合肥230027 [2]中国科学院声学研究所国家网络新媒体工程技术研究中心,北京100190

出　　处：《重庆大学学报（自然科学版）》2010年第8期29-35,共7页Journal of Chongqing University

基　　金：'十一五'国家科技支撑计划资助项目(2008BAH28B04)

摘　　要：提出了一种在网络带宽充足的条件下,能够匹配嵌入式终端接收能力的大型多媒体文件传输协议EMFTP(embedded multimedia file transfer protocol,嵌入式媒体文件传输协议)。该协议是基于UDP的应用层传输协议,采用统一重传的差错恢复策略,并引入了基于带宽探测的递减式加增乘减速率控制算法,在尽可能的降低嵌入式接收端的资源占用前提下,提高数据传输速率。实验表明,与传统的UDT和FTP传输协议相比,EMFTP的数据传输速度分别提高了3%和17%,接收方终端的CPU占用率分别降低50.3%和42.3%,内存占用率降低15%和4%。A novel transport protocol for large-scaled multimedia file-EMFTP （Embedded Multimedia File Transfer Protocol） is proposed to match the receiving capability of embedded terminal with sufficient network bandwidth. EMFTP is an application-level protocol using UDP, and adopts a method of uniform retransmission as its error recovery strategy and it also introduces an improved DAIMD （AIMD with decreasing increases） rate control algorithm based on bandwidth probe. It can improve the data transfer rate with a low resource-taken of embedded client. As the experimental result shows, compared with UDT and FTP protocol implemented on embedded terminal, EMFTP data transfer rate is increased by 3% and 17% respectively, the embedded client CPU occupancy ratios are reduced by 50.3% and 42.3% separately, and memory usage reduced by 15% and 4%.

关 键 词：网络协议 嵌入式终端 流量控制 差错恢复 带宽探测 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]