Embedded Real-time Multimedia Communications Performance Optimization Technology

The TCP/IP suite has long been valued for its ability to interconnect diversecomputer platforms from PCs, Macintoshes and Unix systems to mainframes andsupercomputers such as the Cray. However, there are several characteristics of TCP/IPnetworks that cause problems for multimedia traffic. These include the protocolsthemselves, latency, bandwidth capacity, and response time.This thesis mainly discusses the implementation of the host-oriented IPv4protocol stack. For the short of the hardware resources such as RAM, the embeddedsystem could not support the full of TCP/IP protocol and it must expurgate the TCP/IPprotocol according to different network application. This paper discusses a method ofthe implementation of the embedded TCP/IP protocol by software with the support ofDeltaCore CRTOS.In addition, with the rapid deployment of multimedia applications, the need forreal-time scheduling in embedded system continues to increase. However, the strictpreemptive nature of traditional scheduling algorithms such as rate-monotonic (RM)and earliest-deadline-first (EDF) leads to inefficiencies specially when used toschedule protocol processing at high speeds or multimedia encode/decodecomputation. We present our modified RM scheme called DP-RM (RM with delayedpreemption) as an example that solves some scheduling efficiency problems. Oursolution mainly focus on the strict combination of protocol implementation and OSeffectively schedule.