Study on Main Factors Affecting the Optimal UDP Packet''''s Length
影响最佳UDP分组长度的主要因素的研究

To provide reference for mobile Ad Hoc network designers,the main factors which affect the optimal UDP(User Datagram Protocol) packet's length when transmitting CBR traffic is studied by simulation in this paper.Both AODV and DSR routing protocols are adopted in the research.Moreover,the channel BER(Bit Error Rate) is taken into consideration.Extensive simulations are made in a specifically scenario where nodes move randomly.The simulating results show that routing protocol,traffic intension and the BER are all main factors that affect the optimal UDP packet's length.When considering an error free channel,the optimal UDP packet's length corresponding AODV is a little shorter than that corresponding DSR,and it becomes longer when the traffic intension increases.When considering a channel with BER equaling to 10-4,the optimal UDP packet's length is shorter than that under error free channel,and network performance becames worse quickly when the packet's length increases from the optimal value gradually.