Backoff Method Based on Physical Layer Channel Quality Estimation Constraints

Abstract

The invention discloses a backoff method based on physical layer channel quality estimation constraints, and relates to a MAC layer backoff method based on physical layer channel quality estimation, which is applicable to MPSK modulation. The significance of the invention lies in a wireless local area network system, Provides a way to use the network physical layer to obtain real-time channel quality information between receiving and sending nodes through training data, hand it over to the MAC layer, and use it to adjust the backoff parameters and modify the value of the backoff counter in a timely manner, so as to give the node an appropriate contention channel Ability. By using the OFDM system blind equalization technology in the PHY layer to obtain the channel quality estimation criterion, and then applying the criterion in the back-off method, this method finally realizes the protection of high-quality channel data flow.

Description

technical field [0001] The invention belongs to the field of wireless local area network communication, and specifically refers to a back-off method based on physical layer channel quality estimation constraints. Background technique [0002] The development of informatization in modern society has led to a large increase in high-speed and high-quality data transmission services, and the requirements for transmission system capacity have increased. Modern wireless local area network has the advantages of convenient installation, flexible use, and low cost, and is widely used. However, due to the limited spectrum of wireless channels, selective fading of channels, and random competition mechanism for channel access, wireless local area networks cannot be like wired Ethernet. So much to offer. The backoff mechanism is a specific contention solution used in the wireless node Media Access Control (MAC) protocol. It determines the backoff time that a node needs to experience eac...

AI Technical Summary

Problems solved by technology

However, the communication environment in the wireless network is relatively complex. The data packets sent by the station may fail to send data frames due to poor wireless channel conditions, or may cause data transmission failures due to collisions, resulting in unnecessary backoffs.

The existing conventional protocol backoff algorithms do not take into account the quality of the wireless channel, but directly judge that "the ACK of the corresponding data packet has not been received" is caused by a collision. This kind of judgment is limited and arbitrary, which makes the backoff algorithm low efficiency

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