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Band width estimation method based on self-adapting sampling

A technology of adaptive sampling and bandwidth estimation, applied in the field of network communication, can solve the problems of poor sensitivity to bandwidth changes, inaccurate estimated bandwidth, low estimated bandwidth, etc.

Inactive Publication Date: 2009-02-18
BEIHANG UNIV
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Problems solved by technology

[0014] It can be seen from this that the defect of the TCPW+ algorithm is that if the propagation delay is large, it is inaccurate to estimate the bandwidth using the packet RTT as the denominator of the bandwidth sampling expression, and there is a theoretical maximum estimable bandwidth
Bandwidth estimation The method of fixing the cut-off frequency of the filter makes the sensitivity to bandwidth changes poor. In the case of satellite communication environments where link conditions change drastically, it is easy to overestimate or underestimate the bandwidth.

Method used

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  • Band width estimation method based on self-adapting sampling
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  • Band width estimation method based on self-adapting sampling

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Embodiment Construction

[0044] The ASBE method provided by the present invention is: determine the sampling time T according to the update information of the response message ACK service ;according to T service Determine the bandwidth sampling value BW with the current accumulated data volume; perform nonlinear adaptive filtering on BW.

[0045] After determining T according to the update information of ACK servicePreviously, the transmission information should be obtained according to the ACK, and the transmission information should be updated to determine the update information. The update information refers to the time information related to ACK, and the update information may include RTT, minimum loop transmission time RTT min , the time difference between the arrival of adjacent acknowledgment messages ΔACK and the minimum time difference between the arrival of adjacent acknowledgment messages ΔACK min . The transmission information includes: the amount of data P corresponding to this ACK s...

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Abstract

The invention discloses a bandwidth estimation method based on self-adaptation sampling comprising: obtaining transmission information according to response message, and updating the transmission message, determining the updating information, determining sampling time according to update time of response message, determining bandwidth sampling value according to sampling time and accumulated data quantity, executing non-linear self-adaptive filtering processing for the sampling value for bandwidth. The invention can determines accurate time of information service constituted by a cluster of packet of bandwidth, enable network time delay to influence little on bandwidth estimation computation result; filter automatically regulates self stability and agility following link wave motion, promotes anti-error code interference ability of estimation result. The invention promotes estimation accuracy for link bandwidth of large time delay high error code rate satellite network.

Description

technical field [0001] The invention relates to an adaptive sampling-based bandwidth estimation (Adaptive Sample BandwidthEstimation, hereinafter referred to as: ASBE) method, which belongs to the field of network communication. Background technique [0002] Satellite networks can achieve seamless global coverage and support communication between anyone, anywhere, anytime. With the rapid development of satellite communication technology and the unprecedented prosperity of the Internet, satellite communication networks supporting Transmission Control Protocol / Internet Protocol (TCP / IP protocol for short) services have developed rapidly. Satellite links have characteristics different from terrestrial networks, such as large delay, high bit error rate, high delay-bandwidth product, and asymmetric link bandwidth. The traditional TCP / IP protocol is designed for wired networks with good transmission performance, and the throughput will be greatly reduced in the environment of sat...

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Application Information

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IPC IPC(8): H04L12/56H04L29/06H04W24/08H04W28/04
Inventor 刘锋赵寒徐桢
Owner BEIHANG UNIV
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