Research And Application Of High-Capacity MAC Protocol Based On Dynamic User Sets

WIFI has become an indispensable part of people's lives due to its advantages of low cost,high speed,and ease of use.With the explosive growth of wireless intelligent terminals and the rapid development of mobile Internet,people's connection requirements for WIFI are increasing,and WIFI network intensive user scenarios are becoming more and more common.In a large-scale conference room,college classrooms,airports,trains and other personnel-intensive scenes,there are often 100 to 200 people within a single AP's coverage area that need to access the Internet via WIFI.Because the WIFI uses the CSMA/CA mechanism in the MAC layer access mechanism,this mechanism only supports single-user access and single-user data transmission,that is,only one user is allowed to transmit data at the same time.And once the user accesses,it will not quit and divide the fixed user's bandwidth into the access,but the data generation often has a very large randomness.When the user is idle,the problems such as low channel utilization and serious shortage of bandwidth will occur.Therefore,this paper proposes a dynamic user access control method to improve the 802.11 MAC layer mechanism.Based on the existing 802.11 protocol,this paper proposes a large-capacity MAC protocol based on dynamic user sets.The system architecture of this protocol consists of four parts:router,mobile terminal,PC,and server.Each end communicates according to the high-capacity MAC protocol of the dynamic user set.When the user is idle,the user resources are still occupied.The large-capacity MAC protocol of the dynamic user set disconnects idle users for access by users with data needs.Through this protocol,a large number of users can be connected in a short time.This paper conducts mathematical modeling and performance analysis of large-capacity MAC protocol based on dynamic user sets.The simulation results show that the protocol can effectively increase the number of accessible users and channel utilization of WIFI system.This paper also implements software implementation of large-capacity MAC protocol based on dynamic user sets.Using OPENWRT router operating system,this protocol is implemented on the wndr4300 hardware platform and the function and performance of the system are tested.The test results show that the protocol is A large number of user connections were provided in a short period of time and the validity of the protocol was verified.