### New packet discard model based on average changing rate of packet and ideal length

LI Zhimin1，2, GAO Bin2, ZHAO Zhiguo2

1. 1.Shool of Information Engineering, Hunan Mechanical & Eelectrical Polytechnic, Changsha 410151, China
2.School of Computer Science and Technology, University of South China, Hengyang, Hunan 421001, China
• Online:2015-06-01 Published:2015-06-12

### 基于平均变化率和空闲长度的丢包概率模型

1. 1.湖南机电职业技术学院 信息工程学院，长沙 410151
2.南华大学 计算机科学与技术学院，湖南 衡阳 421001

Abstract: As the calculation of the packet loss probability is lack of accuracy without considering the self-similarity of the network flow, a new packet discard model based on the average changing rate of the packet enqueue rate and the ideal queue length is brought out, and it gives the corresponding algorithms—DRED algorithms. By introducing the state of the network flow into the calculation of the packet loss probability, it overcomes the drawback that the RED directly discards all the packets that will enqueue when the average length of queue between the maximum threshold and the maximum length, and the packet discard probability varies with the changes of the network traffic states. The?simulation results show that to adopt the DRED algorithms can make the calculation of the packet lose rate more accurate, the throughput of the network increases, the packet loss rate reduces and the network performance is improved, although the end-to-end delay increases slightly, but the delay jitter is relative smaller, compared with the RED algorithms.