Radio network node, user equipment and methods therein

• US 9,426,753 B2
• Filed: 05/03/2012
• Issued: 08/23/2016
• 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:
  US14/397,711
• Publication Number:
  US 20150105119A1
• Time in Patent Office: 1,573 Days
• Field of Search: 455/522, 455/69, 455/68, 455/127.1, 455/500, 455/517, 455/508, 455/507, 455/515, 455/422.1, 455/403, 455/445, 455/550.1, 455/426.1, 455/426.2, 455/509, 455/450, 370/252, 370/310, 370/328, 370/329, 370/338, 370/343
• US Class Current: 1/1
• 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 (10) for determining a transmit power to be used by the user equipment when transmitting in a radio communications network, which user equipment (10) is served by a radio network node (12,12′) in the radio communications network. The user equipment (10) receives, from the radio network node (12,12′), 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 (10). The user equipment (10) 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, from the radio network node, an indication indicating a set of power control parameters out of multiple sets of power control parameters, 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, and 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 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 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 further comprises receiving an accumulative power command, and 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

receiving the multiple sets of power control parameters from the radio network node during configuration of the user equipment;

and

storing the received multiple sets of power control parameters at the user equipment.

6. A method according to claim 1, wherein the indication explicitly indicates the indicated subframe and the explicitly indicated subframe implicitly indicates the set of power control parameters.

7. A method according to claim 1, wherein the multiple sets of power control parameters comprises different sets of power control parameters to respectively apply for different subframes.

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:

determining a set of power control parameters to be used by the user equipment for determining transmit power of the user equipment; and

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

9. A method according to claim 8, further comprising

configuring the user equipment with the multiple sets of power control parameters by sending the multiple sets to the user equipment.

10. 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.

11. 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 percentage of a pathloss that is to be taken into account when determining transmit power, a power offset value, and a power command value.

12. A method according to claim 8, further comprising retrieving the indication indicating the determined power control parameter from a memory at the radio network node.

13. A method according to claim 8, wherein the determining comprises analyzing an interference situation in a cell serving the user equipment or an interference situation in a cell neighbouring the cell.

14. A method according to claim 8, wherein the indication is transmitted for granted subframes, wherein the granted subframes experience adjacent channel interference.

15. A method according to claim 8, wherein the indication explicitly indicates the indicated subframe and the explicitly indicated subframe implicitly indicates the set of power control parameters.

16. A method according to claim 8, wherein the method comprises selectively transmitting to the user equipment an accumulative power command to accumulate the accumulative power command with a previously transmitted power command, wherein different accumulations are done for different sets of power control parameters.

17. 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, wherein the user equipment comprises:

a memory configured to have multiple sets of power control parameters stored thereon;

a receiver configured to receive, from the radio network node, an indication indicating a set of power control parameters out of the stored multiple sets of power control parameters; and

a determining circuit configured to determine a transmit power for the indicated subframe based on the indicated set of power control parameters,

wherein the multiple sets of power control parameters comprise a specific set of power control parameters to apply for one or more subframes, and wherein the indication indicates a subframe comprised in the one or more subframes.

18. A user equipment according to claim 17, 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 transmit power, a power offset value, and a power command value.

19. A user equipment according to claim 18, wherein the determining circuit is configured to determine transmit power using a formula defined as

20. A user equipment according to claim 17, wherein the receiver is further configured to receive an accumulative power command, and the determining circuit is configured to accumulate the accumulative power command with a previously used power command, and to accumulate differently for different sets of power control parameters.

21. A user equipment according to claim 17, wherein the receiver is further configured to receive the multiple sets of power control parameters from the radio network node during configuration of the user equipment;

and the user equipment is configured to store the multiple sets of power control parameters at the memory.

22. 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 comprises:

a determining circuit configured to determine a set of power control parameters to be used by the user equipment for determining transmit power of the user equipment; and

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

23. A radio network node according to claim 22, further comprising

a configuring circuit configured to configure the user equipment with the multiple sets of power control parameters by sending the multiple sets to the user equipment over the transmitter.

24. A radio network node according to claim 22, 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.

25. A radio network node according to claim 22, 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 transmit power, a power offset value, and a power command value.

26. A radio network node according to claim 22, further comprising

a retrieving circuit configured to retrieve the indication indicating the determined set of power control parameters from a memory at the radio network node.

27. A radio network node according to claim 22, wherein the determining circuit is configured to analyze an interference situation in a cell serving the user equipment or an interference situation in a cell neighbouring the cell.

28. A radio network node according to claim 22, wherein the indication is transmitted for granted subframes, and wherein the granted subframes experience adjacent channel interference.

29. The radio network node of claim 22, wherein the transmitter is configured to selectively transmit an accumulative power command to accumulate the accumulative power command with a previously transmitted power command, wherein different accumulations are done for different sets of power control parameters.