Radio Network Node, User Equipment and Methods Therein

• US 20150105119A1
• Filed: 05/03/2012
• Published: 04/16/2015
• Est. Priority Date: 05/03/2012
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Eriksson, Erik, Astely, David
• Granted Patent: US 9,426,753 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• 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

1-32. -32. (canceled)

33. 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;

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

34. A method according to claim 33, wherein the multiple sets of power control parameters comprises 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.

35. A method according to claim 33, wherein the indication is comprised in an uplink grant message, and wherein the indication is a pointer in a list of sets of power control parameters, wherein the pointer indicates in the list what set of power control parameter to apply by the user equipment when determining transmit power.

36. A method according to claim 33, 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.

37. A method according to claim 36, wherein the determining comprises to determine transmit power using a formula defined as

38. A method according to claim 33, 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.

39. A method according to claim 33, 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.

40. 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.

41. A method according to claim 40, further comprising

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

42. A method according to claim 40, wherein the multiple sets of power control parameters comprises a specific set of power control parameters to apply for one or more subframes, and the indication indicates a subframe comprised in the one or more subframes.

43. A method according to claim 42, 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.

44. A method according to claim 40, wherein the indication is comprised in an uplink grant message, wherein the indication is a pointer in a list of sets of power control parameters, wherein the pointer indicates in the list what set of power control parameter to apply by the user equipment when determining transmit power.

45. A method according to claim 40, 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.

46. A method according to claim 40, further comprising

retrieving the indication indicating the determined power control parameter from a memory at the radio network node.

47. A method according to claim 40, 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.

48. A method according to claim 40, wherein the indication is transmitted for granted subframes, wherein the granted subframes experience adjacent channel interference.

49. 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 based on the indicated set of power control parameters.

50. A user equipment according to claim 49, wherein the multiple sets of power control parameters comprises 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.

51. A user equipment according to claim 49, wherein the receiver is configured to receive an uplink grant message comprising the indication, wherein the indication is a pointer in a list of sets of power control parameters, and wherein the pointer indicates in the list what set of power control parameter to apply in the determining circuit.

52. A user equipment according to claim 49, 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.

53. A user equipment according to claim 52, wherein the determining circuit is configured to determine transmit power using a formula defined as

54. A user equipment according to claim 49, 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.

55. A user equipment according to claim 49, 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.

56. 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.

57. A radio network node according to claim 56, further comprising

a configuring circuit adapted 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.

58. A radio network node according to claim 56, wherein the multiple sets of power control parameters comprises a specific set of power control parameters to apply for one or more subframes, and the indication indicates a subframe comprised in the one or more subframes.

59. A radio network node according to claim 58, 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.

60. A radio network node according to claim 56, wherein the transmitter is configured to transmit an uplink grant message comprising the indication, wherein the indication is a pointer in a list of sets of power control parameters, and wherein the pointer indicates in the list what set of power control parameter to apply by the user equipment when determining transmit power.

61. A radio network node according to claim 56, 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.

62. A radio network node according to claim 56, 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.

63. A radio network node according to claim 56, 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.

64. A radio network node according to claim 56, wherein the indication is transmitted for granted subframes, and wherein the granted subframes experience adjacent channel interference.