Radio network node, user equipment and methods therein

• US 9,888,444 B2
• Filed: 08/05/2016
• Issued: 02/06/2018
• Est. Priority Date: 05/03/2012
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Eriksson, Erik, Astely, David
• Primary Examiner(s): Ferguson, Keith
• Application Number:
  US15/230,173
• Publication Number:
  US 20160345272A1
• Time in Patent Office: 550 Days
• Field of Search: 455522, 455 69, 455 68, 4551271, 455500, 455517, 455508, 455507, 455515, 4554221, 455403, 455445, 455 5, 455 501, 4554261, 4554262, 455509, 455450, 370252, 370310, 370328, 370329, 370338, 370343
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/226 using past references to control power, e.g. look-up-table
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/386 centralized, e.g. when the radio network controller or equivalent takes part in the power control
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/0473 the resource being transmission power

Abstract

Some embodiments herein relate to method in a user equipment for determining a transmit power to be used by the user equipment when transmitting in a radio communications network, which user equipment is served by a radio network node in the radio communications network. The user equipment receives, from the radio network node, an indication indicating a set of power control parameters out of multiple sets of power control parameters, which multiple sets of power control parameters are stored at the user equipment. The user equipment determines a transmit power based on the indicated set of power control parameters.

Claims

1. A method in a user equipment for determining a transmit power to be used by the user equipment when transmitting in a radio communications network, wherein the user equipment is served by a radio network node in the radio communications network, the method comprising:

receiving multiple sets of power control parameters from the radio network node during configuration of the user equipment, wherein the multiple sets of power control parameters are stored at the user equipment, wherein the multiple sets of power control parameters comprise a specific set of power control parameters to apply for one or more subframes;

receiving, from the radio network node, an indication indicating a set of power control parameters out of the multiple sets of power control parameters, wherein the indication indicates a subframe comprised in the one or more subframes;

determining the transmit power for the indicated subframe based on the indicated set of power control parameters.

2. A method according to claim 1, wherein the indication indicates a set of power control parameters that comprises at least one of:

a maximum transmit power,

a target received power,

a value indicating a percentage of a pathloss that is to be taken into account when determining the transmit power,

a power offset value, and

a power command value.

3. A method according to claim 2, wherein the determining comprises to determine transmit power using a formula defined as

4. A method according to claim 1,

wherein the receiving the indication further comprises receiving an accumulative power command;

wherein the determining further comprises determining to accumulate the accumulative power command with a previously used power command; and

wherein different accumulations are done for different sets of power control parameters.

5. A method according to claim 1, further comprising retrieving the indication indicating the set of power control parameters from a memory at the radio network node.

6. A method according to claim 1, wherein the method further comprises analyzing an interference situation in a cell serving the user equipment or an interference situation in a cell neighbouring the cell, and transmitting the indication based on the analyzing.

7. A method according to claim 1, wherein the indication is transmitted for granted subframes, wherein the granted subframes experience adjacent channel interference.

8. A method in a radio network node for controlling a transmit power of a user equipment in a radio communications network, wherein the radio network node serves the user equipment in the radio communications network, the method comprising:

configuring the user equipment with multiple sets of power control parameters by sending the multiple sets to the user equipment, wherein the multiple sets of power control parameters comprise a specific set of power control parameters to apply for one or more subframes; and

transmitting an indication to the user equipment, wherein the indication indicates a set of power control parameters out of the multiple sets of power control parameters stored at the user equipment, thereby controlling the transmit power of the user equipment, wherein the indication indicates a subframe comprised in the one or more subframes.

9. A method according to claim 8, wherein the radio network node serves the user equipment in a cell, and wherein the one or more subframes is a subframe or subframes used for a downlink transmission in the cell or a cell neighbouring the cell.

10. A method according to claim 8, wherein the set of power control parameters comprises at least one of:

a maximum transmit power,

a target received power,

a value indicating a percentage of a pathloss that is to be taken into account when determining a transmit power,

a power offset value, and

a power command value.

11. A user equipment for determining a transmit power to be used by the user equipment when transmitting in a radio communications network, wherein the user equipment is configured to be served by a radio network node in the radio communications network, and wherein the user equipment comprises a processor and a memory, the memory containing instructions executable by the processor whereby the user equipment is configured to:

receive multiple sets of power control parameters from the radio network node during configuration of the user equipment, wherein the multiple sets of power control parameters are stored at the user equipment, wherein the multiple sets of power control parameters comprise a specific set of power control parameters to apply for one or more subframes;

receive, from the radio network node, an indication indicating a set of power control parameters out of the multiple sets of power control parameters, wherein the indication indicates a subframe comprised in the one or more subframes;

determine the transmit power for the indicated subframe based on the indicated set of power control parameters.

12. A user equipment according to claim 11, wherein the set of power control parameters comprises at least one of:

a maximum transmit power,

a target received power,

a value indicating percentage of a pathloss that is to be taken into account when determining the transmit power,

a power offset value, and

a power command value.

13. A user equipment according to claim 12, wherein the memory contains instructions executable by the processor whereby the user equipment is configured to determine the transmit power using a formula defined as

14. A user equipment according to claim 11, wherein the memory contains instructions executable by the processor whereby the user equipment is configured to:

receive an accumulative power command; and

determine the transmit power by accumulating the accumulative power command with a previously used power command, and to accumulate differently for different sets of power control parameters.

15. A radio network node for controlling a transmit power of a user equipment in a radio communications network, wherein the radio network node is configured to serve the user equipment in the radio communications network, the radio network node comprising a processor and a memory, the memory containing instructions executable by the processor whereby the radio network node is configured to:

configure the user equipment with multiple sets of power control parameters by sending the multiple sets to the user equipment, wherein the multiple sets of power control parameters comprise a specific set of power control parameters to apply for one or more subframes; and

transmit an indication to the user equipment, wherein the indication indicates a set of power control parameters out of the multiple sets of power control parameters stored at the user equipment, thereby controlling the transmit power of the user equipment, wherein the indication indicates a subframe comprised in the one or more subframes.

16. A radio network node according to claim 15, wherein the radio network node is configured to serve the user equipment in a cell and the one or more subframes is a subframe or subframes used for a downlink transmission in the cell or a cell neighbouring the cell.

17. A radio network node according to claim 15, wherein the set of power control parameters comprises at least one of:

a maximum transmit power,

a target received power,

a value indicating percentage of a pathloss that is to be taken into account when determining a transmit power,

a power offset value, and

a power command value.

18. A radio network node according to claim 15, wherein the memory contains instructions executable by the processor whereby the radio network node is configured to retrieve the indication indicating the set of power control parameters from a memory at the radio network node.

19. A radio network node according to claim 15, wherein the memory contains instructions executable by the processor whereby the radio network node is configured to:

analyze an interference situation in a cell serving the user equipment or an interference situation in a cell neighbouring the cell; and

transmit the indication based on the analysis of the interference situation.

20. A radio network node according to claim 15, wherein the indication is transmitted for granted subframes, and wherein the granted subframes experience adjacent channel interference.