Granted Patent B2

US 12,432,712 · App. 17/442,935 · Granted Sep 30, 2025

Inventors: Chih-Hsiang Wu (Taoyuan, TW); Kao-Peng Chou (Taoyuan, TW)

Assignee: GOOGLE LLC

H04W72/1263H04W24/08H04W72/0446H04W72/0453H04W72/23

Abstract

Claims (75)

1. A method, in a user device, of obtaining control channel information from a base station that communicates with the user device via a shared carrier, the method comprising:

receiving, from the base station via the shared carrier, a first search space configuration indication indicating a pre-transmission pattern of control channel occasions, each control channel occasion of the pre-transmission pattern of control channel occasions being a respective time window in which the user device is to monitor a control channel on the shared carrier;

receiving, from the base station via the shared carrier, a second search space configuration indication indicating a transmission pattern of control channel occasions that is different than the pre-transmission pattern, but includes at least one control channel occasion that overlaps a control channel occasion of the pre-transmission pattern and includes more or fewer control channel occasions per unit time than the pre-transmission pattern, each control channel occasion of the transmission pattern of control channel occasions being a respective time window in which the user device is to monitor the control channel on the shared carrier;

monitoring the control channel on the shared carrier according to the pre-transmission pattern;

while monitoring the control channel according to the pre-transmission pattern, receiving, from the base station via the shared carrier, a downlink control information, DCI, indicating that the user device is to start monitoring according to the transmission pattern; and

in response to receiving the DCI, monitoring, during a transmission time in which the shared carrier is available to the base station, the control channel on the shared carrier according to the transmission pattern.

2. The method of claim 1 , wherein receiving the first and second search space configuration indications includes receiving one or more messages, the one or more messages comprising:

one or more radio resource control (RRC) messages;

one or more DCIs; or

one or more messages including medium access control (MAC) control elements.

3. The method of claim 2 , wherein:

receiving the one or more messages includes receiving an indication of a first time-frequency resource and an indication of a second time-frequency resource;

monitoring the control channel during control channel occasions of the pre-transmission pattern includes monitoring the control channel using the first time-frequency resource; and

monitoring the control channel during control channel occasions of the transmission pattern includes monitoring the control channel using the second time-frequency resource.

4. The method of claim 1 , further comprising:

after receiving the DCI, and before monitoring the control channel according to the transmission pattern, monitoring, during the transmission time, the control channel on the shared carrier according to the pre-transmission pattern for either (i) a predetermined number of control channel occasions, or (ii) a number of control channel occasions indicated in a message that the user device received from the base station.

5. The method of claim 1 , further comprising, before receiving the DCI, receiving, from the base station via the shared carrier, a signal that causes the user device to enter a mode in which the user device can decode the control channel information.

6. The method of claim 1 , wherein the DCI further indicates one or more of (i) that the transmission time has started, (ii) a duration of the transmission time, or (iii) an ending of the transmission time.

7. The method of claim 1 , wherein receiving the DCI is a retransmission of an earlier DCI, and wherein the DCI indicates a remaining duration of the transmission time.

8. A method, in a base station, of providing control channel information to a user device that communicates with the base station via a shared carrier, the method comprising:

transmitting, to the user device via the shared carrier, a first search space configuration indication indicating a pre-transmission pattern of control channel occasions, each control channel occasion of the pre-transmission pattern of control channel occasions being a respective time window in which the user device is to monitor a control channel on the shared carrier;

transmitting, to the user device via the shared carrier, a second search space configuration indication indicating a transmission pattern of control channel occasions that is different than the pre-transmission pattern, but includes at least one control channel occasion that overlaps a control channel occasion of the pre-transmission pattern and includes more or fewer control channel occasions per unit time than the pre-transmission pattern, each control channel occasion of the transmission pattern of control channel occasions being a respective time window in which the user device is to monitor the control channel on the shared carrier;

determining, using a channel access procedure, that the shared carrier is available to the base station for a transmission time; and

transmitting to the user device a downlink control information, DCI, indicating that the user device is to start monitoring according to the transmission pattern, the DCI causing the user device to switch from (i) monitoring the control channel on the shared carrier according to the pre-transmission pattern before the transmission time to (ii) monitoring the control channel on the shared carrier according to the transmission pattern during the transmission time.

9. The method of claim 8 , further comprising:

transmitting at least a portion of the control channel information to the user device via the shared carrier during at least one control channel occasion in the transmission pattern.

10. The method of claim 8 , wherein the DCI indicates one or more of (i) that the transmission time has started, (ii) a duration of the transmission time, or (iii) an ending of the transmission time.

11. The method of claim 8 , wherein the DCI is a first DCI that indicates the transmission time, and further comprising:

transmitting to the user device a second DCI indicating a remaining duration of the transmission time.

12. The method of claim 8 , wherein:

transmitting the first and second search space configuration indications to the user device includes transmitting an indication of a first time-frequency resource and an indication of a second time-frequency resource to the user device;

monitoring the control channel during control channel occasions of the pre-transmission pattern causes the user device to monitor the control channel using the first time-frequency resource; and

monitoring the control channel during control channel occasions of the transmission pattern causes the user device to monitor the control channel using the second time-frequency resource.

13. The method of claim 8 , wherein transmitting the first and second search space configuration indications to the user device includes:

transmitting one or more radio resource control (RRC) messages to the user device;

transmitting one or more DCIs to the user device; or

transmitting one or more messages including medium access control (MAC) control elements to the user device.

14. A user device comprising processing hardware and configured to:

receive, from a base station via a shared carrier, a first search space configuration indication indicating a pre-transmission pattern of control channel occasions, each control channel occasion of the pre-transmission pattern of control channel occasions being a respective time window in which the user device is to monitor a control channel on the shared carrier;

receive, from the base station via the shared carrier, a second search space configuration indication indicating a transmission pattern of control channel occasions that is different than the pre-transmission pattern, but includes at least one control channel occasion that overlaps a control channel occasion of the pre-transmission pattern and includes more or fewer control channel occasions per unit time than the pre-transmission pattern, each control channel occasion of the transmission pattern of control channel occasions being a respective time window in which the user device is to monitor the control channel on the shared carrier;

monitor the control channel on the shared carrier according to the pre-transmission pattern;

while monitoring the control channel according to the pre-transmission pattern, receive, from the base station via the shared carrier, a downlink control information, DCI, indicating that the user device is to start monitoring according to the transmission pattern; and

in response to receiving the DCI and during a transmission time in which the shared carrier is available to the base station, monitor the control channel on the shared carrier according to the transmission pattern.

15. The user device of claim 14 , wherein receiving the first and second search space configuration indications includes receiving one or more messages, the one or more messages comprising:

one or more radio resource control (RRC) messages;

one or more DCIs; or

one or more messages including medium access control (MAC) control elements.

16. The user device of claim 15 , wherein:

receiving the one or more messages includes receiving an indication of a first time-frequency resource and an indication of a second time-frequency resource;

monitoring the control channel during control channel occasions of the pre-transmission pattern includes monitoring the control channel using the first time-frequency resource; and

monitoring the control channel during control channel occasions of the transmission pattern includes monitoring the control channel using the second time-frequency resource.

17. The user device of claim 14 , wherein the user device is further configured to:

after receiving the DCI, before monitoring the control channel according to the transmission pattern, and during the transmission time, monitor the control channel on the shared carrier according to the pre-transmission pattern for either (i) a predetermined number of control channel occasions, or (ii) a number of control channel occasions indicated in a message that the user device received from the base station.

18. The user device of claim 14 , wherein the user device is further configured to:

before receiving the DCI, receive, from the base station via the shared carrier, a signal that causes the user device to enter a mode in which the user device can decode the control channel information.

19. The user device of claim 14 , wherein the DCI further indicates one or more of (i) that the transmission time has started, (ii) a duration of the transmission time, or (iii) an ending of the transmission time.

20. The user device of claim 14 , wherein receiving the DCI is a retransmission of an earlier DCI, and wherein the DCI indicates a remaining duration of the transmission time.

21. A base station comprising processing hardware and configured to:

transmit, to a user device via a shared carrier, a first search space configuration indication indicating a pre-transmission pattern of control channel occasions, each control channel occasion of the pre-transmission pattern of control channel occasions being a respective time window in which the user device is to monitor a control channel on the shared carrier;

transmit, to the user device via the shared carrier, a second search space configuration indication indicating a transmission pattern of control channel occasions that is different than the pre-transmission pattern, but includes at least one control channel occasion that overlaps a control channel occasion of the pre-transmission pattern and includes more or fewer control channel occasions per unit time than the pre-transmission pattern, each control channel occasion of the transmission pattern of control channel occasions being a respective time window in which the user device is to monitor the control channel on the shared carrier;

determine, using a channel access procedure, that the shared carrier is available to the base station for a transmission time; and

transmit to the user device a downlink control information, DCI, indicating that the user device is to start monitoring according to the transmission pattern, the DCI causing the user device to switch from (i) monitoring a control channel on the shared carrier according to the pre-transmission pattern before the transmission time to (ii) monitoring the control channel on the shared carrier according to the transmission pattern during the transmission time.

22. The base station of claim 21 , wherein the base station is further configured to:

transmit at least a portion of the control channel information to the user device via the shared carrier during at least one control channel occasion in the transmission pattern.

23. The base station of claim 21 , wherein the DCI indicates one or more of (i) that the transmission time has started, (ii) a duration of the transmission time, or (iii) an ending of the transmission time.

24. The base station of claim 21 , wherein the DCI is a first DCI that indicates the transmission time, and further comprising:

transmitting to the user device a second DCI indicating a remaining duration of the transmission time.

25. The base station of claim 21 , wherein:

transmitting the first and second search space configuration indications to the user device includes transmitting an indication of a first time-frequency resource and an indication of a second time-frequency resource to the user device;

monitoring the control channel during control channel occasions of the pre-transmission pattern causes the user device to monitor the control channel using the first time-frequency resource; and

monitoring the control channel during control channel occasions of the transmission pattern causes the user device to monitor the control channel using the second time-frequency resource.

26. The base station of claim 21 , wherein transmitting the first and second search space configuration indications to the user device includes:

transmitting one or more radio resource control (RRC) messages to the user device;

transmitting one or more DCIs to the user device; or

transmitting one or more messages including medium access control (MAC) control elements to the user device.

Assignments (1)

Continuity (2)

References Cited (66)