| In the future WLAN network, the number and variety of wireless devices and users is in a sharp increase, at the same time, wireless access service requires better quality. In order to enhance the overall performance of the WLAN, and improve the Qos and actual user experience, IEEE 802.11 Working Group make a variety of technical requirements in the study of 802.11 ax,which include enhancing spectrum efficiency and reducing power consumption of the users’terminals. The introduction of D2D(Device to Device) technology can enhance the spectrum efficiency of 802.11 ax network, reduce the burden of AP, latency and power consumption,so it is has important significance to study and discuss the introduction of the D2D technology into 802.11 ax.It will cause some interferences among D2D STA and AP/STA(non D2D STA controlled by AP). To reduce this interference, it is need to explore and discuss the key factors affecting the interference through the simulation analysis of the interferences, in order to seek one D2D communication resource allocation algorithm in 802.1 lax network.In this paper, development and scenarios and functional requirements of 802.11ax are elaborated, then some technology requirements of D2D are proposed. Secondly,I simulate the interferences among D2D STAs and AP/STAs through the link level simulation platform of 802.11ax,which pays close attention to technical indicators like power, time and frequency offset, Guardband respectively in the uplink and downlink communication process. We can explore the key factors and level affecting the interference and the influence of interference in the PER graph. Finally,a improved algorithm of DRC is proposed,which takes location information and transmission power as the key factors obtained in the results of simulation analysis. Simulation results show that the average outage probability of D2D link of the improved algorithm is superior to DRC algorithm. |
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