Modified TCPW congestion control method in wireless network

A congestion control and wireless network technology, applied in wireless communication, network traffic/resource management, electrical components, etc., to achieve the effect of improving network throughput and network QoS

Inactive Publication Date: 2012-10-03
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0034] In order to overcome the defect of overestimating the network available bandwidth value in the existing TCPW congestion control algorithm, and the influence of network asymmetry on network congestion control, the present invention provides a more accurate estimation of the current actual available bandwidth value and effectively improves the network QoS Improved TCPW Congestion Control Method in Wireless Networks

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  • Modified TCPW congestion control method in wireless network
  • Modified TCPW congestion control method in wireless network
  • Modified TCPW congestion control method in wireless network

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Embodiment Construction

[0057] The present invention will be further described below in conjunction with the accompanying drawings.

[0058] Referring to Figure 1, although there are many network congestion control methods in wireless networks, the TCPW algorithm is ideal in terms of congestion control, and it is also designed in strict compliance with the TCP end-to-end design criteria. However, when there are burst flows and delayed compressed packets in the network, the network jitter under TCPW is relatively large, which affects the recovery of the network status. The method in this embodiment is obtained based on the above analysis results.

[0059] In the network, the data sending rate of the TCP source is dynamically adjusted according to the state of the network. The improved method of TCPW in the present invention is to measure and estimate the current available bandwidth of the network according to the rate of the returned response packet, so as to adjust the data transmission rate of the ...

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Abstract

The invention discloses a modified TCPW congestion control method in a wireless network. After a specified data receiving terminal receives a data packet each time, a timestamp is stamped in a reply packet corresponding to the data packet, after a data sending terminal receives the reply packet, the arrive time of the current reply packet is not recorded, but the timestamp on the reply packet is extracted, so as to obtain the timestamp difference, namely the sending time of the last data packet on the sending route, in the next arrived reply packet, the size of the arrived data packet and the sending time of the data packet on the sending route are respectively subjected to averaging at the sending terminal, and then a bandwidth sampling value is obtained according to the specific value of average values. Finally a bandwidth estimated value is smoothly obtained through an exponential weighting moving average filter according to the obtained bandwidth sampling value. The method is more accurate to estimate a current practical available bandwidth value and effectively improves network QoS.

Description

technical field [0001] The invention relates to the field of wireless network congestion control, in particular to a TCPW congestion control method. Background technique [0002] Currently, congestion control techniques in wireless networks face many difficulties. Since the wireless network has the characteristics of terminal mobility and wireless connection, the reliability of the link is not high. To run the existing TCP protocol in a wireless network with high bit error rate, large delay and frequent terminal movement, It becomes relatively difficult, data transmission has its instability, and congestion is more likely to occur. Therefore, in order to make the TCP protocol run stably in the wireless network, have better network throughput, and have good robustness and scalability, the original protocol must be modified accordingly. [0003] TCPW is an end-to-end congestion control algorithm that fully complies with the design criteria of the TCP protocol. During the da...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W28/02
Inventor 王万良刘琳琅岑跃峰蒋一波郑建炜赵燕伟
Owner ZHEJIANG UNIV OF TECH
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