Carrier Grade Wi-Fi: Air interface requirements and technologies

摘要: The IEEE 802.11 standardization group has recently ratified 802.11ac as the newest major amendment of family Wi-Fi standards. While specified a number improvements over 802.11n such as: (i) 8 spatial streams (ii) mandatory bandwidth 80 MHz and (iii) multi-user MIMO on downlink, these mostly target to improve per-link throughput, in case MU-MIMO, traffic performance downlink. In order satisfy air interface high efficiency requirements technologies, herein referred broadly 5G-Carrier Grade WiFi (5G-CGW), it is important consider other metrics for system performance, area-throughput Quality Experience (QoE), which are more relevant use cases where there can be dense deployment access points (APs), stations (STAs). Recently, started study called High Efficiency (HEW) develop next generation physical (PHY) medium control (MAC) protocols that would requirements. this paper we will first provide an overview state-of-the-art standards, followed by discussion some limitations interest deployments apartment buildings, stadiums airports. We preliminary simulation results three technologies have shown promise meeting CGW: Multi-User Parallel Channel Access (MU-PCA) allow APs simultaneously transmit receive from STAs frequency domain: enabled through multiplexing. This alleviate problem underutilization resources caused need support different bandwidths. Uplink (UL MU-MIMO): standardized simultaneous transmissions downlink via MU-MIMO. MU-MIMO needs defined enable multiple users share domain at same time uplink. Fractional CSMA Transmit Power Control (TPC): APs, overlapping basic service sets (BSSs) improved coordinating transmitted power adjacent manner edge coverage face reduced interference.