A wireless communication link adaptive method against transmission interference

Abstract

The invention discloses a transmitting-interference-resistant wireless communication link adaptive method. The method includes the steps: when a sending node transmits frames to a receiving node by means of A-MPDU (aggregated MAC protocol data unit) frame aggregation, capturing transmission state information of PHY (physical layer) terminals and MPDU subframes in real time, and calculating synchronous interference occurrence probability and asynchronous interference occurrence probability; once loss of the PHY terminals or the MPDU subframes happens, estimating interference factors in communication links according to relation between a each of the synchronous interference occurrence probability and asynchronous interference occurrence probability and a corresponding threshold, immediately executing corresponding measures for transmitting interference resistance to guarantee reliability in frame transmission. By means of estimation of interferences in the links from a sending end, on the one hand, protocol expenditure is saved while frame length is reduced; on the other hand, frame transmissions states are acquired and counted in real time by means of B-ACK frames so as to reason out synchronous interferences and asynchronous interferences in the links to assist the sending end in execution of optimal measures for transmitting interference resistance, proper frame transmission speed is selected, and the problem of inaccuracy in estimation of the synchronous interferences and the asynchronous interferences is avoided.

Description

technical field [0001] The invention relates to the field of wireless communication link transmission research, in particular to a wireless communication link adaptive method against transmission interference. Background technique [0002] Frames may fail due to link interference during wireless link transmission. The main factors affecting frame transmission are synchronous interference and asynchronous interference, which usually refer to collisions and hidden nodes. Due to the overlapping of basic service sets (BBS) between APs and the increase of the number of nodes and data packets in the wireless network, the quality of the communication link is low, resulting in low utilization of wireless broadband. In order to ensure the successful transmission of frames, the sender usually selects an appropriate rate according to the signal-to-interference-plus-noise ratio (SINR) of the link to ensure reliable frame transmission, that is, a trade-off between rate and reliability. ...

AI Technical Summary

Problems solved by technology

At present, one type of method is based on the feedback of the transmission quality of the communication link at the receiving end, that is, the receiving end carries more communication link information and feeds back to the sending end through the B-ACK frame, so as to judge the link environment more accurately. Feedback information from the receiving end can quickly adjust parameters to avoid interference and obtain higher network throughput, but this method underestimates the synchronization interference problem and does not fully consider the communication link environment where the The asymmetry between the forward link and the reverse link makes it difficult for the receiving end to estimate the communication link situation of the sending end, so that the method based on the receiving end cannot estimate the communication link interference more accurately

[0004] In the process of implementing anti-transmission interference measures, if the receiver estimates the communication link environment, it will inevitably require additional control overhead and increase the frame length; in addition, although the receiver can accurately estimate link asynchronous interference, its main The difficulty is that synchronization interference estimation is difficult to estimate

Images