Granted Patent B2

US 12,739,759 · App. 18/478,752 · Granted Sep 15, 2026

Inventors: Hua Zhou (Vienna, VA); Hyoungsuk Jeon (Centreville, VA); Esmael Hejazi Dinan (McLean, VA); Ali Cagatay Cirik (Chantilly, VA); Kyungmin Park (Vienna, VA)

Assignee: Comcast Cable Communications, LLC

H04W52/365H04W72/231

Abstract

Claims (47)

1 . A method comprising:

receiving, by a wireless device, one or more radio resource control (RRC) messages comprising:

first parameters of a serving cell; and

second parameters of one or more candidate cells;

receiving a medium access control (MAC) control element (CE) indicating to switch from using the serving cell as a primary cell (PCell) to using a first candidate cell, of the one or more candidate cells, as a PCell; and

based on receiving the MAC CE:

switching from using the serving cell as a PCell to using the first candidate cell as a PCell;

indicating, to an upper layer of the wireless device, the switch indicated in the MAC CE;

canceling a triggered power headroom report (PHR) for the serving cell;

reconfiguring power headroom functionality of the wireless device; and

based on the reconfiguring power headroom functionality, triggering a PHR for the first candidate cell.

2 . The method of claim 1 , wherein the indicating the switch to the upper layer comprises sending the MAC CE to a radio resource configuration (RRC) layer of the wireless device.

3 . The method of claim 1 , further comprising:

triggering a second PHR for the first candidate cell; and

transmitting the second PHR after switching from the serving cell to the first candidate cell.

4 . The method of claim 1 , further comprising triggering a second PHR, for the first candidate cell, without resetting a MAC entity of the wireless device.

5 . The method of claim 1 , wherein the one or more RRC messages comprises an indication to reset a MAC entity of the wireless device, and the method comprises resetting, by the wireless device and based on the MAC CE, the MAC entity of the wireless device.

6 . The method of claim 1 , further comprising starting a PHR timer based on transmitting a second PHR for the first candidate cell.

7 . The method of claim 1 , wherein the MAC CE indicates an activation of a secondary cell (SCell) associated with the first candidate cell.

8 . The method of claim 1 , further comprising activating a secondary cell (SCell) based on receiving the MAC CE.

9 . The method of claim 1 , further comprising transmitting a second PHR, for the first candidate cell, via the first candidate cell.

10 . The method of claim 1 , further comprising switching from using the serving cell as a PCell to using the first candidate cell as a PCell by maintaining first parameters of the serving cell without releasing the first parameters.

11 . The method of claim 1 , further comprising switching from using the serving cell as a PCell to using the first candidate cell as a PCell by skipping a random access (RA) procedure, associated with the first candidate cell, before transmitting a second PHR for the first candidate cell.

12 . A method comprising:

receiving, by a wireless device, one or more radio resource control (RRC) messages comprising configuration parameters of a source cell and one or more candidate cells;

triggering a first power headroom report (PHR) for the source cell;

receiving a medium access control (MAC) control element (CE) indicating to switch from using the source cell as a primary cell (PCell) to using a first candidate cell, of the one or more candidate cells, as a PCell; and

based on receiving the MAC CE:

indicating, to an upper layer of the wireless device, the switch indicated in the MAC CE;

cancelling the first PHR for the source cell; and

triggering a second PHR for the first candidate cell.

13 . The method of claim 12 , further comprising:

transmitting the second PHR after switching from the source cell to the first candidate cell.

14 . The method of claim 12 , wherein the triggering the second PHR for the first candidate cell occurs without resetting a MAC entity of the wireless device.

15 . The method of claim 12 , wherein the one or more RRC messages comprises an indication to reset a MAC entity of the wireless device, and the method comprises resetting, by the wireless device and based on the MAC CE, the MAC entity of the wireless device.

16 . The method of claim 12 , further comprising switching from using the source cell as a PCell to using the first candidate cell as a PCell by maintaining first parameters of the source cell without releasing the first parameters.

17 . The method of claim 12 , further comprising switching from using the source cell as a PCell to using the first candidate cell as a PCell by skipping a random access (RA) procedure associated with the first candidate cell before transmitting a second PHR for the first candidate cell.

18 . A method comprising:

receiving, by a wireless device, one or more radio resource control (RRC) messages comprising:

parameters of a first cell; and

information indicating not to reset a medium access control (MAC) entity of the wireless device after receiving a MAC control element (MAC CE) indicating to switch to using the first cell as a primary cell (PCell);

receiving a first MAC CE indicating to switch from using a second cell as a PCell to using the first cell as a PCell; and

based on receiving the first MAC CE and the one or more RRC messages:

cancelling a first power headroom report (PHR) for the second cell; and

triggering a second PHR for the first cell.

19 . The method of claim 18 , further comprising switching from using the second cell as a PCell to using the first cell as a PCell by maintaining first parameters of the second cell without releasing the first parameters.

20 . The method of claim 18 , further comprising switching from using the second cell as a PCell to using the first cell as a PCell by skipping a random access (RA) procedure associated with the first cell before transmitting the second PHR.

Assignments (2)

Continuity (2)

References Cited (97)