Method for operating wake-up receiver in wireless LAN system and apparatus therefor
A method by which a station (STA) operates in a wake up receiver (WUR) mode in a wireless LAN (WLAN) system, according to one embodiment of the present invention, comprises the steps of: entering into the WUR mode by turning off a WLAN transceiver of the STA and turning on a WUR receiver of the STA; starting a timer by entering into the WUR mode; and turning on the WLAN transceiver of the STA when the timer is completed or a wake-up signal for waking up the STA is detected through the WUR receiver, wherein the timer can indicate the remaining time for which the STA can maintain the WUR mode until the STA receives a predetermined WUR signal for confirming the presence of an associated access point (AP).
1. A method in which a station (STA) operates in a wake-up receiver (WUR) mode in a wireless local area network (WLAN) system, the method comprising:
entering a WUR mode by turning off a WLAN transceiver of the STA and turning on a WUR of the STA;
in response to the entering the WUR mode, starting a timer; and
turning on the WLAN transceiver of the STA when the timer expires or a wake-up signal to wake up the STA is detected through the WUR,
wherein the timer represents information related to a remaining time for which the STA is able to remain in the WUR mode until receiving a predetermined WUR signal to confirm presence of an access point (AP) associated with the STA, and
wherein, based on the predetermined WUR signal confirming the presence of the AP is received before the timer expires, the STA resets the timer to an initial value and remains in the WUR mode.
2. The method of claim 1 , wherein the predetermined WUR signal to confirm the presence of the AP comprises at least one of a WUR beacon frame and a wake-up signal to wake up another STA.
3. The method of claim 2 , wherein the predetermined WUR signal to confirm the presence of the AP comprises at least one of a basic service set identifier (BSSID), an MAC address, a partial BSSID, and a BSS color of the AP.
4. The method of claim 1 , wherein the initial value of the timer is a value that the STA receives from the AP using the WLAN transceiver before entering the WUR mode or a value determined based on a transmission period of a WUR beacon frame.
5. The method of claim 1 , further comprising:
when the WLAN transceiver is turned on due to expiration of the timer,
attempting to detect an intra-basic service set (BSS) frame through the WLAN transceiver for a certain period of time; and
returning to the WUR mode or performing an AP scanning procedure depending on whether the intra-BSS frame is detected.
6. The method of claim 1 , further comprising:
when the WLAN transceiver is turned on due to expiration of the timer,
requesting a response from the AP through the WLAN transceiver; and
returning to the WUR mode or may performing an AP scanning procedure depending on whether the response is received from the AP.
7. A station (STA) operating in a wake-up receiver (WUR) mode in a wireless local area network (WLAN) system, the STA comprising:
a WLAN transceiver;
a WUR; and
a processor configured to enter a WUR mode by turning off the WLAN transceiver and turning on the WUR,
start, by the WUR, a timer in response to the entering the WUR mode, and
turn on the WLAN transceiver of the STA when the timer expires or a wake-up signal to wake up the STA is detected through the WUR,
wherein the timer represents information related to a remaining time for which the STA is able to remain in the WUR mode until receiving a predetermined WUR signal to confirm presence of an access point (AP) associated with the STA, and
wherein, based on the predetermined WUR signal confirming the presence of the AP is received before the timer expires, the WUR resets the timer to an initial value and remains in the WUR mode.
8. The STA of claim 7 , wherein the predetermined WUR signal to confirm the presence of the AP comprises at least one of a WUR beacon frame and a wake-up signal to wake up another STA.
9. The STA of claim 8 , wherein the predetermined WUR signal to confirm the presence of the AP comprises at least one of a basic service set identifier (BSSID), an MAC address, a partial BSSID, and a BSS color of the AP.
10. The STA of claim 7 , wherein the initial value of the timer is a value that the processor receives from the AP using the WLAN transceiver before entering the WUR mode or a value determined based on a transmission period of a WUR beacon frame.
11. The STA of claim 7 , wherein when the WLAN transceiver is turned on due to expiration of the timer, the processor attempts to detect an intra-basic service set (BSS) frame through the WLAN transceiver for a certain period of time, and returns to the WUR mode or performs an AP scanning procedure depending on whether the intra-BSS frame is detected.
12. The STA of claim 7 , wherein when the WLAN transceiver is turned on due to expiration of the timer, the processor requests a response from the AP through the WLAN transceiver, and returns to the WUR mode or performs an AP scanning procedure depending on whether the response is received from the AP.