Unlock instant, AI-driven research and patent intelligence for your innovation.

Wi-Fi available bandwidth estimation method combined with directional antenna

A technology of bandwidth estimation and directional antenna, which is applied in the field of communication, can solve the problems that the wireless network performance cannot be fully described, the antenna affects the available bandwidth, and it is difficult to obtain it accurately, so as to overcome the waste of bandwidth resources, accurately calculate, and reduce errors.

Active Publication Date: 2021-09-28
XIDIAN UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the establishment of this model requires an accurate topological description of the network, which is difficult to accurately obtain in wireless networks.
[0005] The existing technical methods for estimating the available bandwidth often have the disadvantages of large errors and complex models, and since the commonly used antennas are mainly directional antennas, the different performances of the antennas in each direction will also affect the available bandwidth. , if its directional characteristics are not considered, the result cannot fully describe the wireless network performance

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Wi-Fi available bandwidth estimation method combined with directional antenna
  • Wi-Fi available bandwidth estimation method combined with directional antenna
  • Wi-Fi available bandwidth estimation method combined with directional antenna

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] With the rapid growth of WiFi business's demand for network speed and bandwidth, it puts forward higher requirements for data transmission rate, delay performance, service quality QoS requirements, etc., and high-bandwidth services such as video multimedia services and big data services are increasing. fast. Accurate estimation of available bandwidth in WiFi has important research significance for congestion control, QoS guarantee, conflict avoidance, etc.

[0029] Existing technical methods for estimating available bandwidth often have the disadvantages of large errors and complex models, and few scholars combine the directional characteristics of directional antennas with the estimation of available bandwidth. There are certain differences in signal strength and bandwidth resources in each direction, so the directivity of a directional antenna will also affect its available bandwidth. If its directional characteristics are not considered, the result cannot fully descr...

Embodiment 2

[0039] The WiFi available bandwidth estimation method combined with the directional antenna is the same as in embodiment 1, and the channel utilization algorithm based on the transmission frame length in the fixed period described in step (4) is specifically embodied by the following formula:

[0040]

[0041] In the formula, μ is the channel utilization rate; R is the actual sending rate of the signal; T is the fixed time observation period, and the value of the fixed period is specified by the designer according to the refresh rate of the underlying data of the router; ∑ T F is the sum of the sizes of all transmission frame lengths in a fixed observation period.

[0042] Compared with the prior art, the present invention has the advantage that since the observation period is fixed, frame length data can be transmitted in a more convenient and accurate statistical period. The systematic error, the channel utilization obtained by direct calculation is more accurate than the...

Embodiment 3

[0044] The WiFi usable bandwidth estimation method in conjunction with directional antenna is the same as embodiment 1-2, step (6) described in adding direction correction coefficient in the calculation formula of preliminary estimated value, concrete calculation formula is:

[0045]

[0046] In the formula, AB j That is, the estimated value of the available bandwidth in the j direction; R is the actual transmission rate of the signal; T is a fixed time observation period, and the value of the fixed period is specified by the designer according to the data refresh rate at the bottom of the router; C is the maximum throughput of the system; ∑ T f j Represents the sum of all transmission frames in an observation period; Re j is the number of retries, Fail j It is the number of packets that failed to be sent. These two parameters describe the number of times the system retries to send data packets once the transmission fails, and the number of data packets that failed to be...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for estimating the available bandwidth of WiFi combined with a directional antenna, which solves the problems in the prior art of estimating the available bandwidth of a WiFi network with low precision, complex models, and ignoring the influence of antenna directionality. The steps are: constructing a WiFi network; measuring The actual transmission rate of the signal; extract the length of each transmission frame in a fixed period and the maximum throughput of the system; calculate the channel utilization rate in a fixed observation period; calculate the preliminary estimate of the available bandwidth of the channel; add directional correction to obtain an estimate of the final available bandwidth. The present invention uses a channel utilization algorithm based on the transmission frame length in a fixed period, combines directional antennas, adds a directional correction coefficient to the estimation formula, accurately estimates the available bandwidth of the WiFi network, and tracks its changes in various directions, and It does not occupy extra bandwidth resources of the system. It is of great significance to WiFi congestion control, QoS guarantee, conflict avoidance and other uses, and is used in the field of wireless communication.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to estimation of available bandwidth in the technical field of wireless communication, in particular to a method for estimating available bandwidth of WiFi combined with a directional antenna. It can be used to accurately estimate the bandwidth of the WiFi network, and can be used as a reference index for system routing selection. Background technique [0002] The meaning of available bandwidth between nodes is the maximum throughput that can be used for data transmission between sending and receiving nodes without affecting the existing business traffic. In WiFi, this indicator can be used as an important routing selection indicator. Most existing available bandwidth estimation algorithms mainly fall into three categories: active injection, tool estimation based on mathematical models, and passive monitoring. The active injection method injects some probe packets with ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04W24/08
Inventor 李晓辉苏凡张鑫
Owner XIDIAN UNIV