Energy Efficient Downlink Transmission in Wireless LANs by Using Low-Power Wake-Up Radio

Figure 1

Framework for remote wake-up control of a mobile node. An AP transmits a wake-up message with a traffic indication map by applying the OOK modulation on the envelope of an OFDM signal. A node is equipped with a low-power WuR, which conducts envelope detection to receive a wake-up message, detects SNR, and performs carrier sense.