Software Design Of Multi-STAs System Of 802.11ax Prototype

The next-generation WiFi wireless LAN 802.11 ax protocol provides users with faster Wi-Fi connection speeds.This article relies on the project "802.11 ax prototype research and development",in the project acceptance stage,in order to verify the functional completeness of the designed 802.11 ax prototype,designed a wireless transmission system based on 802.11 ax based on the existing physical layer interface of the project.And through the transmission of upper-level video services as a result of project acceptance.The 802.11 ax wireless transmission system designed in this paper is mainly divided into three parts.In the first part,the upper-layer video service implements a video streaming server based on VLC media player and applies a multi-process model.In the second part,the AP-side in the ZC706's arm kernel based on the netfilter framework of Linux operating system through kernel registers the hook function and intercepts the video network packets.The video network packet is encapsulated in the 802.11 ax frame format and calls the AXI DMA driver interface to interact with hard mac data,for multi-user video frame classification cache polling send.The STA side acquires data from the AXI DMA interface and transparently transmits the data to the STA-side PC through Ethernet frame encapsulation.In the third part,the FPGA of ZC706 development board implements the hard MAC of system,complete the AXI DMA hardware part.The AP side design multi-user cache module for multi-user video data frames to improve the mac layer traffic design aggregation module to achieve three-frame convergence,use the Perform CRCP to check on data to improve data accuracy,and send the data to the physical layer through the existing L1L2 interface.After the hard MAC on the STA side obtains data from the L1L2 interface,decompose and aggregate the frames and perform frame verification,etc.,and then use AXI DMA to send data to soft Mac.The 802.11 ax wireless transmission system implemented in this paper verifies the functional completeness of the 802.11 ax prototype,and designed the upper layer services of the 802.11 ax wireless transmission system,the soft mac layer and the hard mac layer,and the existing physical layer interface is used to transmit and receive wireless data,and simulated the access of many STAs at the same time and carried on the flow test.