A Novel Analysis of Delay and Power Consumption for Polling With PHY-Assisted Power Management

Physical-layer-assisted power management (PA-PM) has great potential for reducing packet delay and lowering power consumption significantly. In PA-PM, the access point transmits the signature of a station to notify it of receiving packets, while the station performs low-power physical-layer correlation operations to detect its signature from the received signal. The detection performance of the signature has a crucial impact on the performance of PA-PM. In this paper, focusing on a polling scheme with PA-PM, we are the first to propose a novel queueing model to study the impact of the detection performance on the packet delay and the power consumption. Our model is applicable to homogeneous and heterogeneous traffic. Based on this model, we can optimize the sleeping interval of a station that minimizes the power consumption while meeting the delay requirement. Extensive simulations verify that our model is very accurate. This study can help system developers choose optimal system parameters (such as the sleeping interval and the signature length) and promote the practicality of PA-PM.