METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING A WAKE-UP SIGNAL IN A WIRELESS COMMUNICATION SYSTEM

• US 20200137685A1
• Filed: 12/27/2017
• Published: 04/30/2020
• Est. Priority Date: 04/20/2017
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: KIM, Sanggook, LEE, Ki-Dong
• Granted Patent: US 11,057,832 B2
• Time in Patent Office: Days
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 52/0241 where no transmission is received, e.g. out of range of the transmitter
• CPC Class Codes: H04W 52/0245 according to signal strength
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Disclosed herein is a method for transmitting a wake-up signal in a wireless communication system supporting a wake-up radio (WUR) operation. The method performed by a network entity comprises transmitting a first wake-up signal for waking up a specific terminal to a specific access point (AP); transmitting a second wake-up signal to all APs within the coverage of the network entity if a response for the first wake-up signal is not received before a first timer expires; and transmitting, to a base station, a response message including control information indicating whether the specific terminal exists.

Claims

1. A method for transmitting a wake-up signal in a wireless communication system supporting a wake-up radio (WUR) operation, the method performed by a network entity comprising:

transmitting a first wake-up signal for waking up a specific terminal to a specific access point (AP);

transmitting a second wake-up signal to all APs within a coverage of the network entity if a response for the first wake-up signal is not received before a first timer expires; and

transmitting, to a base station, a response message including control information indicating whether the specific terminal exists,

wherein the control information indicates that the specific terminal exists when the response for the second wake-up signal is received before a second timer expires,

wherein the control information indicates that the specific terminal does not exist if the response for the second wake-up signal is not received until the second timer expires.

2. The method of claim 1, wherein the network entity transmits information for a category assigned to the specific terminal to all the APs together with the second wake-up signal.

3. The method of claim 2, wherein the information for a category includes an on-duration that the wake-up signal is transceived and an off-duration that the wake-up signal is not transceived.

4. The method of claim 3, wherein the network entity transmits information for a time point at which a category is assigned to the specific terminal to all the APs together with the second wake-up signal.

5. The method of claim 1, wherein a duty cycle of the category assigned to the specific terminal is changed in units of a predetermined time.

6. The method of claim 5, wherein the duty cycle includes an on-duration and an off-duration.

7. The method of claim 1, wherein the first timer is run when the network entity transmits the first wake-up signal.

8. The method of claim 1, wherein the second timer is run when the network entity transmits the second wake-up signal.

9. The method of claim 1, further comprising:

receiving, from a base station, a first message including a wake-up indication indicating that a main communication module of the specific terminal is waken-up,

wherein the received first message includes identification information identifying the specific AP.

10. A method of receiving a wake-up signal in a wireless communication system supporting a wake-up radio (WUR) operation, the method performed by a terminal comprising:

receiving information for a category related to an operation of the WUR module from a access point (AP),

wherein the information for the category includes an on-duration and an off-duration;

monitoring the wake up signal during an on-duration of the received category;

waking-up a main communication module if the wake-up signal is not received during a predetermined time as a result of the monitoring; and

operating in an active mode or a passive mode using the main communication module,

wherein the active mode is a mode in which the main communication module transmits a signal including identification information of the terminal to an access point (AP), and the passive mode is a mode for receiving a broadcast signal from the AP.

11. The method of claim 10, further comprising:

receiving, from the AP, a response for the signal including identification information when operating in the active mode.

12. The method of claim 11, further comprising:

checking whether the AP assigning the category has been changed through the broadcast signal or the response.

13. The method of claim 12, further comprising:

restarting the monitoring of the wake-up signal from a first on-duration of the received category if the AP assigning the category is not changed.

14. The method of claim 12, further comprising:

performing an association with the changed AP if the AP assigning the category is changed;

receiving information for a category related to the operation of the WUR module from the changed AP; and

monitoring the wake-up signal during an on-duration of a category received from the changed AP.

15. The method of claim 12, wherein the operation of the WUR module is to receive a wake-up signal in on-duration and not to receive a wake-up signal in off-duration.