Long-distance link variable rate selection retransmission method

Abstract

The invention discloses a long-distance link variable rate selection retransmission method. The method comprises the following steps: (1) adjusting a frame structure; (20) sending the data by use of the sending rate uniquely corresponding to different MCS by a sending end in a fixed sending rate, counting received signal strength and frame delivery rate at a receiving end to obtain a relationship between the MAC layer frame delivery rate and the received signal strength under different MCS; (30) randomly sending a rate to send the data frame by the sending end when firstly sending the data; (40) feeding back a BA frame to the sending end by the receiving end according to the received frame; (50) judging whether needs to send the next frame, if needing to send the next frame, turning to step (60) of sending the data frame with a designated rate by the sending end, or ending the operation; and (60), sending the data frame by use of the rate corresponding to the MCS indication area number in the BA frame by the sending end, and turning to step (40). By use of the retransmission method disclosed by the invention, the transmission efficiency when the channel quality is poor can be effectively improved.

Description

technical field [0001] The invention belongs to long-distance wireless communication technology, in particular to a long-distance wireless link variable rate selective retransmission method. Background technique [0002] With the rapid development of contemporary technology, the Internet has become an indispensable part of urban life. However, in remote rural areas, the cost of satellite communication is high, mobile cellular network (3G / 4G) and WiMAX need to deploy a large number of base stations due to low population density, and the cost is high, and the difficulty of network access seriously restricts education, medical care and various life service industries development of. At present, the network access methods mainly include satellite communication, mobile cellular network (3G / 4G) and optical fiber access, but the cost of satellite access is high and the bandwidth is limited. It is difficult and expensive to lay optical fiber, and a large number of base stations ar...

AI Technical Summary

Problems solved by technology

[0006] The current selective retransmission strategy based on aggregated frames does not take into account the huge cost of long-distance retransmission, and the long-distance wireless link adaptive algorithm does not combine the frame aggregation and block confirmation features of the 802.11n protocol, which cannot guarantee reliable retransmission To ensure the overall performance of the link and avoid the sharp drop of channel utilization due to repeated retransmission of aggregated frames

[0007] Therefore, the problems existing in the prior art are: in a link where the channel fading changes randomly, the retransmission efficiency of the data frame is low, the reliability is poor, and the retransmission cost is very high, which will cause a sharp drop in performance

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