Granted Patent B2

US 12,563,503 · App. 18/552,879 · Granted Feb 24, 2026

Inventors: Anders Lamm (Mölndal, SE); Pär Ankel (Nödinge, SE); Holger Urban Bergström (Lerum, SE); Lars Rönnborn (Pixbo, SE); Andreas Andersson (Landvetter, SE)

Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

H04W52/365H04W52/08H04W52/367

Abstract

Claims (50)

1 . A method performed by a base station for adjusting a transmission power of a primary cell of a cell group, the method comprising:

receiving, from a wireless device, an indication of a first power headroom, PH_PSCell, associated with the primary cell;

determining a power headroom target;

comparing the first power headroom and the power headroom target; and

determining whether to adjust a transmission power of the primary cell based on the comparison; and

wherein the step of determining a power headroom target comprises:

determining whether an indication of a second power headroom, PH_SCell, associated with one or more Secondary Cells, SCells, in the cell group has been received; and

responsive to the second power headroom, PH_SCell, not being received, performing one of:

setting the power headroom target as a predetermined value; or

setting the power headroom target as a first target, PHTarget1, calculated based on bandwidths of the primary cell and the one or more SCells respectively.

2 . The method of claim 1 , wherein the step of determining a power headroom target further comprises:

responsive to the second power headroom, PH_SCell, being received, setting the power headroom target, PHTarget2, as a maximum of the first target, PHTarget1, and the second power headroom, PH_SCell.

3 . The method of claim 2 , further comprising receiving, from the wireless device, the indication of the second power headroom, PH_SCell, associated with the one or more Secondary Cells, SCells.

4 . The method of claim 1 , wherein the step of determining whether to adjust a transmission power of the primary cell based on the comparison comprises:

responsive to the comparison indicating that the first power headroom is the same as the power headroom target, determining not to adjust the transmission power of the primary cell.

5 . The method of claim 1 , further comprising:

responsive to the comparison indicating that the power headroom target is greater than the first power headroom, determining to decrease the transmission power of the primary cell.

6 . The method of claim 1 , further comprising:

responsive to the comparison indicating that the power headroom target is less than the first power headroom, determining to increase the transmission power of the primary cell.

7 . The method of claim 1 , further comprising:

transmitting a command to the wireless device to adjust the transmission power of the primary cell based on the comparison.

8 . The method of claim 1 , further comprising:

a. obtaining user data; and

b. forwarding the user data to a host computer or a wireless device.

9 . The method of claim 1 , wherein the primary cell is a Primary Cell, PCell, of a Master Cell Group, MCG, or a Primary Secondary Cell, PSCell, of a Secondary Cell Group.

10 . A computer program product comprising a non-transitory computer readable medium storing a computer program comprising instructions which, when executed on processing circuitry, cause the processing circuitry to carry out the steps of the method of claim 1 .

11 . A base station configured for adjusting a transmission power of a primary cell of a cell group, the base station comprises a processor and a memory, said memory containing instructions executable by said processor whereby said base station is operative to:

receive, from a wireless device, an indication of a first power headroom, PH_PSCell, associated with the primary cell;

determine a power headroom target;

compare the first power headroom and the power headroom target; and

determine whether to adjust a transmission power of the primary cell based on the comparison,

wherein the step of determine a power headroom target comprises:

determine whether an indication of a second power headroom, PH_SCell, associated with one or more Secondary Cells, SCells, in the cell group has been received; and

responsive to the second power headroom, PH_SCell, not being received, perform one of:

set the power headroom target as a predetermined value; or

set the power headroom target as a first target, PHTarget1, calculated based on bandwidths of the primary cell and the one or more SCells respectively.

12 . The base station of claim 11 , wherein the base station is further operative to determine the power headroom target by:

responsive to the second power headroom, PH_SCell, being received, setting the power headroom target, PHTarget2, as a maximum of the first target, PHTarget1, and the second power headroom, PH_SCell.

13 . The base station of claim 12 , further operative to receive, from the wireless device, the indication of the second power headroom, PH_SCell, associated with the one or more Secondary Cells, SCells.

14 . The base station of claim 11 , wherein the base station is operative to determine whether to adjust a transmission power of the primary cell based on the comparison by:

responsive to the comparison indicating that the first power headroom is the same as the power headroom target, determining not to adjust the transmission power of the primary cell.

15 . The base station of claim 11 , further operative to:

responsive to the comparison indicating that the power headroom target is greater than the first power headroom, determine to decrease the transmission power of the primary cell.

16 . The base station of claim 11 , further operative to:

responsive to the comparison indicating that the power headroom target is less than the first power headroom, determine to increase the transmission power of the primary cell.

17 . The base station of claim 11 , further operative to:

transmit a command to the wireless device to adjust the transmission power of the primary cell based on the comparison.

18 . The base station of claim 11 , further operative to:

a. obtain user data; and

b. forward the user data to a host computer or a wireless device.

Assignments (1)

Continuity (2)

References Cited (21)