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An active queue management method for real-time streaming

A technology of active queue management and real-time streaming, which is applied in the field of communication networks and can solve problems such as lack of robustness and sensitive parameters

Active Publication Date: 2018-03-06
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a kind of active queue management method applied to real-time stream transmission in view of the existing active queue management algorithm sensitive to parameters and lack of robustness under non-TCP flow. Adjusted queuing system is studied to obtain the relationship between system parameters and performance

Method used

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  • An active queue management method for real-time streaming

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Experimental program
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Embodiment 1

[0036] Such as figure 2 and image 3 As shown, the simulation experiment of the present invention is carried out under the UMTS environment provided by EURANE in NS2. N servers are located in the wired network, and respectively establish data connections with N wireless terminals UE, and R1 and R2 form the wired network. BS / AP means base station / wireless access point, the wireless link bandwidth is 2Mbps, and the average byte error rate is set to 3.5×10-5. Since N UEs share the wireless bandwidth, the wireless link becomes a bandwidth bottleneck. Therefore, in the experiment, the active queue management algorithm is deployed at the BS / AP, and the rest of the network nodes use Drop-Tail routers. The experiment obtains different degrees of delay performance requirements and system loads by setting different preset retention delays D0 and the number of connections N. The smaller D0 means the higher the delay performance requirements, and the larger N means the heavier the syst...

Embodiment 2

[0044] Such as figure 1 As shown, the present invention proposes a kind of active queue management method that is applied to real-time stream transmission, and this method comprises the steps:

[0045] Step 1: Use queuing theory to study the queuing system with rate adjustment, and obtain the relationship between system parameters and performance. The specific steps are:

[0046] i. Expand the queuing system with rate adjustment, the buffer output rate μ value is no longer limited to 1 (that is, it can be any integer value), the sending end adjusts the packet sending intensity according to the feedback queue length, and the system time is discretized.

[0047] ii. Use the time-discrete first-order Markov chain to theoretically analyze the performance parameters of the system. It mainly analyzes the performance of the queuing system in terms of average queue length, queue length change, overflow probability and underflow probability.

[0048] iii. Realized the influence of th...

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Abstract

The invention discloses an active queue management method applied to real-time stream transmission. The method aims at the problem that the performance of the existing algorithm is sensitive to parameter settings and lacks robustness in a non-TCP stream environment, and proposes a method based on traffic shaping Active queue management algorithm ITS. The ITS algorithm is based on the queuing system with rate adjustment as the theoretical basis, dynamically adjusts the algorithm parameters and update cycle according to the preset retention delay and the measured output bandwidth, and uses the proposed lightweight traffic shaping method to guide packet discarding so that the number of received packets meets the queuing requirements. Conditional Poisson distribution assumptions for the system. The experimental results show that the ITS algorithm has superior delay control ability and delay stability, and can also maintain a lower packet loss rate and a higher link utilization rate.

Description

technical field [0001] The invention relates to an active queue management method applied to real-time stream transmission, and belongs to the technical field of communication networks. Background technique [0002] With the introduction of related technologies in 4G, the downlink peak rate of the cell has risen to the level of 100Mbps. However, with the exponential growth of business traffic and the number of mobile terminals, the complexity of the entire network continues to rise; at the same time, more and more users tend to use mobile terminals such as laptops or smartphones to browse webpages and order videos , game interaction, etc., put forward higher requirements on the delay performance and throughput performance of the network. The inhomogeneity of network resources brought about by the heterogeneity of the network makes the congestion phenomenon more serious and becomes a bottleneck for improving system performance. The current methods to solve the congestion pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/815H04L12/823H04L12/861H04L47/22H04L47/32
Inventor 董育宁宋龙高彭宇珏刘春
Owner NANJING UNIV OF POSTS & TELECOMM