Research On WLAN Efficient Data Transmission Technology Based On Link Aggregation

The new generation of 5G communication systems aims to overcome new network challenges and resolve the business needs of smart grids,smart cities,and more.Its core is network convergence,which improves system performance in terms of throughput,number of connections,and latency.It is a truly converged network by using a variety of technologies including existing wireless access technologies(WLAN,etc.)to meet different needs.Link aggregation technology is one of technologies for network convergence.It can not only improve the reliability of the network,but also increase the bandwidth of the network.In addition,WLAN are an integral part of next-generation wireless communication systems.Therefore,the implementation and design of the WLAN efficient data transmission system based on link aggregation technology are mainly studied in this thesis,so as to efficient data transmission of WLAN based on link aggregation is realized.Link aggregation technology uses multiple links for data transmission at the same time.Due to the different path quality conditions of multiple wireless links,the issue of packet scheduling in aggregated links has attracted widespread attention.How to implement an efficient packet scheduling in aggregated links to achieve the fairness of each links,the maximization of system throughput has become a problem to be solved.This thesis mainly studies the problem of packet scheduling of aggregated links and the design of efficient data transmission scheme in WLAN network environment.Firstly,the key technologies of link aggregation,including principles and aggregation methods,are described.The load balancing problems involved in multi-link transmission and the application of load balancing algorithms in link aggregation are studied.In the data transmission process of link aggregation,the scheduling of data packets is performed in multiple links.To solve this problem,according to the WLAN data transmission system model based on link aggregation,the polling-based packet scheduling algorithm and the available capacity estimation scheduling algorithm based on round-trip delay are described in detail,and on this basis,a multi-parameter joint prediction scheduling algorithm based on extended Kalman filtering is proposed.At the same time, the algorithm considers the impact of parameters on the link quality,such as bandwidth,round-trip delay,packet loss rate,etc.It can more accurately estimate the link quality,perform more reasonable data packet scheduling,and increase the system transmission rate.In order to improve the transmission rate of WLAN data transmission system,a WLAN efficient data transmission design scheme based on link aggregation is proposed.Firstly,the aggregation port selection problem is considered.To save the main thread's time of selecting the aggregation port,the wireless network card is loop detected in a separate thread.then a network card status table is established and maintained according to the detection result.In this way,the main thread only needs to select the aggregation port according to the information in the network card status table,and does not need to spend extra time to detect the wireless network card.Next,a parallel transmission scheme for aggregated links is proposed.According to the corresponding data packet scheduling algorithm,data packets are distributed to multiple wireless links in an aggregated link for parallel transmission.Finally,by setting up a WLAN data transmission system and using different data packet scheduling algorithms,the proposed design scheme is implemented.The experimental results show that the proposed design scheme can use multiple wireless links at the same time,significantly increasing the transmission rate of the system.