Research On Multi-AP Parallel Transmission Technology Of Next Generation WiFi

With the rapid development of intelligent terminals and Internet technology in recent years,people's demand for wireless services is increasing,and the requirements for network speed and network delay are also increasing.In order to meet the needs of people,more and more APs are deployed in wireless LANs,and the impact of interference between different users in multi-AP scenarios is becoming increasingly prominent.The next-generation Wi Fi standard 802.11be(EHT)has proposed the goal of further improving system throughput and optimizing transmission delay.However,multi-AP interference brought by high-density network has become a critical issue that severely limits the performance improvement of Wi Fi.In order to solve this problem,the next-generation Wi Fi proposes several important research directions for multi-AP cooperation: OFDMA cooperation,multi-AP interference nulling,multi-AP joint beamforming,and multi-AP cooperation MU-MIMO.According to the goal of next-generation Wi Fi,designing a practical and feasible interference management scheme in a multi-AP scenario has become an urgent problem to be solved for next-generation Wi Fi.This thesis first outlines the development of the 802.11 standard,and then introduces the next-generation wireless communication standard IEEE 802.11 be and 802.11 MAC frame structure.On this basis,this thesis studies the parallel transmission technology in the next-generation Wi Fi multi-AP scenario from three aspects.First,in order to solve the problem of high complexity and high cost of user selection traversal algorithm in the multiAP downlink beamforming scenario,this thesis proposes a user selection algorithm based on RSSI,and proposes a multi-AP downlink beamforming pairing scheme based on the next-generation Wi Fi standard;Then,this thesis proposes a multi-AP joint transmission scheme based on implicit detection to solve the problem of excessive overhead for acquiring channel CSI by traditional explicit sounding feedback under multi-AP joint transmission;Finally,in view of the excessive overhead and application limitations of interference nulling technology in multi-AP scenarios,this thesis proposes a multi-AP parallel transmission scheme based on interference nulling.This thesis proposes several parallel transmission schemes in multi-AP scenarios.These solutions are applicable to the existing Wi Fi standard(802.11ax)and the nextgeneration Wi Fi standard(802.11be),which can effectively solve the interference problem of multiple APs and improve system performance.In addition,these schemes take into account the problem of signaling overhead in the actual Wi Fi scene,and are easy to implement.