Enhanced power-save multi-poll mechanism for multi-user downlink transmission in WLAN

In this paper, an enhanced power-save multi-poll (PSMP) combining conventional PSMP with Downlink Multiuser Multiple Input Multiple Output (MU-MIMO) is proposed to further improve the energy efficiency of wireless local area network (WLAN) communication system, especially for multiuser WLAN system. The energy consumption in PSMP downlink transmission time (DTT) of the conventional PSMP and the proposed enhanced PSMP scheme are compared via extensive numerical simulation. Numerical analysis results show that the proposed enhanced PSMP scheme consumes less energy than the conventional PSMP when each station (STA) only has one spatial stream to receive. As the number of spatial streams of STAs in conventional PSMP increases, the energy consumption of our proposed enhanced PSMP is still lower than conventional PSMP for short PSDU.