Wireless communication method using wake-up radio and wireless communication terminal using same
Provided is a wireless communication terminal that communicates wirelessly. The terminal includes: a wireless LAN (WLAN) transceiver configured to transmit and receive a WLAN signal; and a wake-up radio (WUR) receiver configured to receive a WUR signal. The WUR receiver is configured to receive a wake-up packet from a base wireless communication terminal and wakes-up the WLAN transceiver. A part of the WUR signal is transmitted by a modulation method different from a modulation method of the WLAN signal.
1. A wireless communication terminal communicating wirelessly, the terminal comprising:
a wireless LAN (WLAN) transceiver configured to transmit and receive a WLAN signal; and
a wake-up radio (WUR) receiver configured to receive a WUR signal being transmitted based on on-off keying (OOK),
wherein the WUR receiver is configured to receive a wake-up part of a wake-up packet from a base wireless communication terminal and wake-up the WLAN transceiver, wherein the wake-up packet is distinguished into a legacy part that the WLAN transceiver is capable of demodulating and the wake-up part including the WUR signal,
wherein the legacy part comprises a legacy preamble part, which is a preamble included in a WLAN physical layer protocol data unit (PPDU) and only includes L-STF including short training signal, L-LTF including long training signal, and L-SIG including signaling information for a legacy wireless communication terminal, and an additional preamble part transmitted immediately after the legacy preamble part, wherein the L-SIG is set according to predetermined values,
wherein the additional preamble part only includes two Orthogonal Frequency Division Multiplexing (OFDM) symbols which are Binary Phase Shift keying (BPSK) modulated.
2. The wireless communication terminal of claim 1 , wherein the WUR receiver is configured to wake up the WLAN transceiver after an arbitrary time from when receiving the wake-up packet.
3. The wireless communication terminal of claim 2 , wherein the arbitrary time is calculated based on a time designated by the wake-up packet.
4. The wireless communication terminal of claim 3 , wherein the arbitrary time is calculated based on a time designated by the wake-up packet and a time required for waking up the WLAN transceiver.
5. The wireless communication terminal of claim 1 , wherein the WLAN transceiver is configured to access a channel based on a priority of data to be received in a wake-up subsequent operation sequence.
6. The wireless communication terminal of claim 1 , wherein the WUR receiver is configured to deliver information obtained from the wake-up part to the WLAN transceiver.
7. A base wireless communication terminal communicating wirelessly, the terminal comprising:
a wireless LAN (WLAN) transceiver configured to transmit and receive a WLAN signal; and
a wake-up radio (WUR) transmitter configured to transmit a WUR signal being transmitted based on on-off keying (OOK),
wherein the WLAN transceiver is configured to transmit, to a wireless communication terminal, a legacy part of a wake-up packet, wherein the legacy part comprises a legacy preamble part, which is a preamble included in a WLAN physical layer protocol data unit (PPDU) and only includes L-STF including short training signal, L-LTF including long training signal, and L-SIG including signaling information for a legacy wireless communication terminal, and an additional part preamble transmitted after the legacy preamble part, wherein the L-SIG is set according to predetermined values,
wherein the additional preamble part only includes two Orthogonal Frequency Division Multiplexing (OFDM) symbols which are Binary Phase Shift keying (BPSK) modulated,
wherein the WUR transmitter is configured to transmit to the wireless communication terminal a wake-up part of the wake-up packet, wherein the wake-up packet indicates information related to a wake-up of the wireless communication terminal.
8. The base wireless communication terminal of claim 7 , wherein the WUR transmitter is configured to transmit information related to wake-up of a plurality of wireless communication terminals to the plurality of wireless communication terminals including the wireless communication terminal using the wake-up part.
9. The base wireless communication terminal of claim 8 , wherein the WUR transmitter is configured to transmit the wake-up part for each of the plurality of wireless communication terminals using different frequency bands.
10. The base wireless communication terminal of claim 7 , wherein the WUR transmitter is configured to insert information on a time at which the wireless communication terminal wakes up and starts a subsequent operation sequence into the wake-up part.
11. The base wireless communication terminal of claim 10 , wherein the WUR transmitter is configured to determine a time for starting the subsequent operation sequence based on the information on the time required for waking up the wireless communication terminal.
12. The base wireless communication terminal of claim 7 , wherein when a first transmission or a first reception fails in a wake-up subsequent operation sequence, the base wireless communication terminal transmits the wake-up packet again to the wireless communication terminal.