High Efficiency And Fair Access Control Strategy For The Next Generation WLAN

The IEEE 802.11 ax standard for the next generation WLAN is an important milestone in the history of IEEE 802.11 standard technology evolution.IEEE 802.11 ax introduces new key technologies at the physical layer and media access control layer to improve the data transmission rate of the physical layer and the channel resource utilization of the media access control layer to cope with the increasing user demands and complex scenarios in the future.However,IEEE 802.11 ax has not been officially published.There are many things worth studying in the process from the draft standard to the actual scene application.This paper studies the channel access and spatial reuse technology of the IEEE 802.11 ax draft standard.The main work and results of this paper are as follows:(1)For the problem of unnecessary backoff and the waste of channel resources in the uplink random access mechanism of the next generation WLAN,a probability complementary transmission strategy,which determines whether to compensate transmission by the complementary probability,is proposed so that the delay caused by retransmission is reduced.Firstly,according to the proposed strategy,the uplink random access process is mathematically modeled and analyzed,and the transmission state of the station is defined.The probability of each transmission state is obtained through analysis and calculation,and the system average throughput and delay are derived.Secondly,the optimization problem of maximizing throughput is proposed.By solving the optimization problem,and the optimal parameters are obtained and applied to the simulation.Finally,performance evaluation is performed by simulation.The results show that the complementary transmission strategy proposed in this paper can support the uplink data transmission with higher throughput and lower delay than the traditional scheme in the IEEE 802.11 ax standard.(2)For the spatial reuse technology of the next generation WLAN,the threshold adjustment algorithm is not clear.A spatial reuse adjustment strategy based on overlapping basic service set packet detection is proposed in this paper.According to the current packet error rate of the station,the threshold of spatial reuse is adjusted,so that the station can perform spatial reuse processes under appropriate conditions to improve throughput and fairness.The simulation results show that the spatial reuse adjustment strategy proposed in this paper can effectively improve the spatial reuse efficiency,the system throughput and inter-station fairness under the constraints of different transmission power.In this paper,there are still many shortcomings in the research of channel access and spatial reuse technology of the next generation WLAN.Therefore,the channel access and spatial reuse technologies of IEEE 802.11 ax standard will be further studied,which provides better solutions in practical complex scenarios.