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Rate self-adaption method based on channel statistical information for real-time WiFi

A technology of rate self-adaptation and channel statistics, applied in the direction of transmission modification based on link quality, adjustment of transmission rate, time division multiplexing system, etc., can solve problems such as usage, achieve the effect of reducing detection time and improving throughput

Active Publication Date: 2017-11-21
ZHEJIANG SCI-TECH UNIV
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Problems solved by technology

However, many of these implementations and tests were only tested using the network simulator NS-2
Furthermore, currently these proposed RA algorithms are not used in practice with existing device drivers because they require modifications to the IEEE 802.11 standard

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  • Rate self-adaption method based on channel statistical information for real-time WiFi
  • Rate self-adaption method based on channel statistical information for real-time WiFi
  • Rate self-adaption method based on channel statistical information for real-time WiFi

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Embodiment Construction

[0024] In order to make the above and other objects, features and advantages of the present invention more apparent, further detailed description will be given below.

[0025] Such as figure 1 As shown, the TDMA link scheduling component mainly has three major modules. The channel access control module is used for the connected station to release the wifi signal through hostapd. The isc-dhcp-server assigns an IP address to the connected station; after the station is successfully connected , the channel access control module will build a new superframe; the link scheduling module is to control the scheduling order of the stations in the superframe, and a new cycle will be performed after the scheduling is completed; the timer module is used to trigger each time slot A superframe consists of many time slots. At the beginning of each poll, the first time slot is for the AP to send a beacon frame for global time synchronization, as shown in Table 1.

[0026] Table 1 A superframe ...

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Abstract

The invention discloses a rate self-adaption method based on channel statistical information for real-time WiFi, which comprises the steps that link scheduling adopts a centralized mode, that is, CSMA / CA is turned off, a TDMA mode is adopted, an AP (Access Point) allocates fixed scheduling time for each station, and data transmission of each station is real-time predictable; and then wireless network channel statistical information is acquired in real time, and transmission rate selection is determined according to updating of the statistical information. The former is an estimation mechanism which is used for estimating the channel quality; and the latter is a response mechanism which realizes adaptive adjustment of the rate. Short-term and long-term channel quality changes are controlled through an inquiring mechanism, the transmission history is intelligently monitored in a continuous manner, and a new data rate which may exceeds the current rate is detected. Effective transmission rate adjustment is performed to quickly adapt to the changes. Therefore, the TDMA link scheduling and the channel information statistics based rate self-adaption method optimize the throughput or delay performance on a wireless link.

Description

technical field [0001] The present invention relates to wireless communication transmission technology, in particular to a rate adaptive method based on channel information statistics on the basis of real-time data transmission of TDMA link scheduling, using TDMA real-time link scheduling, according to specific applications and different channel conditions Quickly obtain the best sending rate and improve the throughput of the wireless link. Background technique [0002] Wireless network technology has the great advantage of its mobility, easier deployment and reduced maintenance and configuration costs. However, the existing CSMA / CA mechanism cannot provide real-time and reliable data packet delivery due to uncertain delay, and channel conditions are constantly changing dynamically in most cases. How to provide predictable data packet interaction, reduce the delay of requests, and adjust the data transmission rate in time to reduce the impact on system performance. The fund...

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Application Information

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IPC IPC(8): H04B17/309H04J3/06H04L1/00H04L1/16H04W56/00H04W74/00
CPCH04B17/309H04J3/0652H04L1/0003H04L1/0026H04L1/1657H04W56/00H04W74/002
Inventor 徐伟强李二兵吴呈瑜俞晴里
Owner ZHEJIANG SCI-TECH UNIV
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