Design And Research Of Lightweight Inter-node Communication Protocol Stack

In recent years, with the continuous development of computer network technology and the widespread use of embedded systems, the research of embedded Internet technology has make considerable progresses. However, the traditional TCP/IP protocol stack is very complex and its efficiency is relatively low. Moreover, the amount of code which used to achieve the function of full TCP/IP protocol stack is very large. We can not realize its full functionality on the resource-constrained embedded systems and hardware chips.For the specific networking mode and network environment, we could simplify and improve the traditional TCP/IP protocol in order to achiece the inter-node high efficiency, high reliability, low latency and lightwight communications. Based on the existing protocol stack, we simplify each protocol that is needed so as to meet the performance requirement of packet loss rate, reliability, throughput and so on. That is the key point of this research. Especially the simplify of TCP is the major work. We reduce the number of TCP state machine in order to decrease the implement code, use a appropriate minimum retransmission timeout value to improve communication efficiency, and add an explicit congestion control mechanism to reduce the packet loss rate. The paper also designed a new type of switch queue management algorithm to mitigate the network congestion situation that appears in the network.First, we give a summary of the lightweight protocol stack, point out the background and current research status at home and abroad, and presents a design idea of lightweight protocol stack. Then, we make a concise discussion on the traditional TCP/IP protocol stack and respectively analysis the ARP, IP, ICMP, UDP, TCP and static routing protocol in a detailed way. Based on this, for a particular network topology needs, we design a simplifying scheme of the main protocols and make further improvements. Then a new type of switch queue management algorithm is designed with the purpose of solving the network congestion problems in a better way. Finally, a brief introduction of OPNET simulation platform is given and the simulation platform model is designed. Using this platform model, we comparatively simulate the improved TCP/IP protocol stack with the traditional one and also simulate the switch queue management algorithm. The simulation results show that the designed queue management algorithm and the improved protocols have significant performence improvement in the loss ratio, transmission delay and the total throughput.