Wi-Fi Wake-Up Radio
Wi-Fi equipment is a successful local-area connectivity technology that has many advantages over competing technologies. Low power consumption is not one of them. To allow battery-powered operation, as often required by IoT applications, a new IEEE 802.11 standard amendment has appeared. It defines a radio technology aiming to reduce Wi-Fi power consumption without sacrificing its rate, range, robustness or security. The 11ba standard specifies a WUR transmitter that wireless access points use to send control packets to wireless stations. These packets trigger a transition of wireless stations’ primary Wi-Fi transceiver out of a low-power sleep state. The WUR radio, used as a companion to the primary connectivity radio, must meet the same range requirement as the primary radio. WUR devices coexist with legacy Wi-Fi devices in the same frequency band. WUR has an expected active receiver power consumption of less than one milliwatt. This talk provides an overview of the WUR standard, discusses various design decisions and shows some examples of implementations.