METHOD AND ARRANGEMENT IN A WIRELESS COMMUNICATION SYSTEM

• US 20150131604A1
• Filed: 05/10/2013
• Published: 05/14/2015
• Est. Priority Date: 05/11/2012
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Hammarwall, David
• Granted Patent: US 9,532,333 B2
• Time in Patent Office: Days
• US Class Current: 370/330
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0077 Cooperative coding
• CPC Class Codes: H04L 25/03898 codebook-based design selection of codebook or precoding matrix for MIMO diversity systems H04B7/0456
• CPC Class Codes: H04L 25/03949 equalizer selection or adaptation based on feedback multiple signaling inclusive of a precoding command for adapting the transmitter H04L1/0031; feedback for transmit diversity systems H04B7/0619; selection of codebook or precoding matrix for MIMO diversity systems H04B7/0456
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/003 Arrangements for allocating sub-channels of the transmission path
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

The invention relates to methods and arrangements in a transmitting node and a receiving node in a wireless communications system. A plurality of transmission configurations is available for transmitting an Information carrying signal from the transmitting node to the receiving node. The transmitting node determines a plurality of muting configurations and selects a transmission configuration. Each muting configuration corresponds to at least one transmission configuration. The transmitting node transmits a dynamic configuration message identifying the at least one muting configuration that corresponds to the selected transmission configuration to the receiving node and transmits the information carrying signal to the receiving node according to the selected transmission configuration. The receiving node receives the dynamic configuration message and the information carrying signal and decodes the received information carrying signal taking the at least one muting configuration into account.

Claims

1-33. -33. (canceled)

34. A method in a receiving node for receiving an information carrying signal that is transmitted to the receiving node by a transmitting node in a wireless communications system, wherein a plurality of transmission configurations are available for transmitting said information carrying signal to said receiving node, the method comprising:

receiving from the transmitting node a dynamic configuration message that identifies, to said receiving node, at least one muting configuration among a plurality of possible muting configurations, the at least one muting configuration corresponding to a transmission configuration selected from said plurality of transmission configurations by the transmitting node for the transmission of said information carrying signal to said receiving node;

receiving said information carrying signal from the transmitting node; and

decoding said received information carrying signal taking said at least one muting configuration into account by assuming that no information expected to be decoded by the receiving node is transmitted on Time-Frequency Resource Elements, TFREs, identified as muted by said at least one muting configuration.

35. The method according to claim 34, wherein the at least one muting configuration is identified by an indicator in the dynamic configuration message.

36. The method according to claim 35, wherein the indicator comprises one or more bits in a Downlink Control Information, DCI, format.

37. The method according to claim 34, wherein the at least one muting configuration comprises a zero-power Channel State Information Reference Signal, CSI-RS, configuration.

38. The method according to claim 37, wherein the at least one muting configuration covers TFREs of at least one Cell Specific Reference Signal, CRS, configuration and/or all TFREs of an Orthogonal Frequency Division Multiplexing, OFDM, symbol.

39. The method according to claim 34, wherein the plurality of muting configurations comprises muting configurations that cover TFREs that are zero-power CSI-RS configurable.

40. The method according to claim 39, wherein the plurality of muting configurations comprises at least one muting configuration that covers TFREs of at least one CRS configuration.

41. The method according to claim 39, wherein the plurality of muting configurations comprises at least one muting configuration that covers all TFREs of an OFDM symbol.

42. The method according to claim 34, wherein the at least one muting configuration is a muting pattern of TFREs that is adjusted to match a desired muting pattern for one or more specific transmission points that are transmitting to the receiving node in a given instance.

43. The method according to claim 42, wherein the given instance is a current subframe in which the dynamic configuration message is received from the transmitting node and wherein the muting pattern is applied for decoding of the information carrying signal in the current subframe.

44. The method according to claim 34, wherein the at least one muting configuration identified in the dynamic configuration message received from the transmitting node in a current subframe is applied for decoding of the information carrying signal in the current subframe.

45. The method according to claim 34, wherein the information carrying signal is received from the transmitting node in a coordinated transmission via one or more transmission points.

46. The method according to claim 45, wherein the coordinated transmission is a Coordinated Multi-Point transmission.

47. The method according to claim 35, wherein the receiving node is a User Equipment, UE, served by a serving cell and the transmitting node is an eNodeB and wherein the at least one muting configuration is determined from the indicator received in the dynamic configuration message, system information of the serving cell of the UE and/or dedicated radio resource control messages from the eNodeB to the UE.

48. The method according to claim 34, wherein the receiving node is a User Equipment, UE, served by a serving cell and the transmitting node is an eNodeB and wherein information that specifies Resource Element mapping of a Physical Downlink Shared Channel includes one or more of:

the at least one muting configuration, information on a number of OFDM symbols occupied by a Physical Downlink Control Channel, TFREs occupied by CRS, and configured non-zero power CSI-RS.

49. A method in a transmitting node for transmitting an information carrying signal to a receiving node in a wireless communications system, wherein a plurality of transmission configurations are available for transmitting said information carrying signal to said receiving node, the method comprising:

determining a plurality of muting configurations, each muting configuration in said plurality of muting configurations corresponding to at least one transmission configuration in said plurality of transmission configurations;

selecting a transmission configuration from said plurality of transmission configurations for transmitting said information carrying signal to said receiving node;

transmitting to said receiving node a dynamic configuration message identifying, to said receiving node, at least one muting configuration out of said plurality of muting configurations that corresponds to said selected transmission configuration; and

transmitting said information carrying signal to said receiving node in a transmission according to said selected transmission configuration, wherein the transmission is muted in accordance with the identified at least one muting configuration.

50. The method according to claim 49, wherein the at least one muting configuration is identified by an indicator in the dynamic configuration message.

51. The method according to claim 50, wherein the indicator comprises one or more bits in a Downlink Control Information, DCI, format.

52. The method according to claim 49, wherein the at least one muting configuration comprises a zero-power Channel State Information Reference Signal, CSI-RS, configuration.

53. The method according to claim 52, wherein the at least one muting configuration covers TFREs of at least one Cell Specific Reference Signal, CRS, configuration and/or all TFREs of an Orthogonal Frequency Division Multiplexing, OFDM, symbol.

54. The method according to claim 49, wherein the plurality of muting configurations comprises muting configurations that cover TFREs that are zero-power CSI-RS configurable.

55. The method according to claim 54, wherein the plurality of muting configurations comprises at least one muting configuration that covers TFREs of at least one CRS configuration.

56. The method according to claim 54, wherein the plurality of muting configurations comprises at least one muting configuration that covers all TFREs of an OFDM symbol.

57. The method according to claim 49, wherein the at least one muting configuration is a muting pattern of TFREs that is adjusted to match a desired muting pattern for one or more specific transmission points that are transmitting to the receiving node in a given instance.

58. The method according to claim 57, wherein the given instance is a current subframe in which the dynamic configuration message is transmitted by the transmitting node and wherein the muting pattern is to be applied by the receiving node for decoding of the information carrying signal in the current subframe.

59. The method according to claim 49, wherein the at least one muting configuration identified in the dynamic configuration message transmitted by the transmitting node in a current subframe is to be applied by the receiving node for decoding of the information carrying signal in the current subframe.

60. The method according to claim 49, wherein the information carrying signal is transmitted by the transmitting node in a coordinated transmission via one or more transmission points.

61. The method according to claim 60, wherein the coordinated transmission is a Coordinated Multi-Point transmission.

62. The method according to claim 50, wherein the receiving node is a User Equipment, UE, served by a serving cell and the transmitting node is an eNodeB and wherein the at least one muting configuration is determined by the indicator transmitted in the dynamic configuration message, system information of the serving cell of the UE and/or dedicated radio resource control messages from the eNodeB to the UE.

63. The method according to claim 49, wherein the receiving node is a User Equipment, UE, served by a serving cell and the transmitting node is an eNodeB and wherein information that specifies resource element mapping of a Physical Downlink Shared Channel includes one or more of:

the at least one muting configuration, information on a number of OFDM symbols occupied by a Physical Downlink Control Channel, TFREs occupied by CRS, and configured non-zero power CSI-RS.

64. A receiving node for receiving an information carrying signal from a transmitting node, the receiving node being configurable to communicate with the transmitting node in a wireless communications system wherein a plurality of transmission configurations are available for transmitting said information carrying signal to said receiving node, the receiving node comprising:

radio circuitry;

processing circuitry configured to receive from the transmitting node via said radio circuitry a dynamic configuration message that identifies, to said receiving node, at least one muting configuration among a plurality of possible muting configurations, the at least one muting configuration corresponding to a transmission configuration selected from said plurality of transmission configurations by the transmitting node for the transmission of said information carrying signal to said receiving node, the processing circuitry configured to receive said information carrying signal from the transmitting node via said radio circuitry, and to decode said received information carrying signal taking said at least one muting configuration into account by assuming that no information expected to be decoded by the receiving node is transmitted on Time-Frequency Resource Elements, TFREs, identified as muted by said at least one muting configuration.

65. A transmitting node for transmitting an information carrying signal to a receiving node, the transmitting node being configured to be connectable to radio circuitry for communicating with the receiving node in a wireless communications system, wherein a plurality of transmission configurations are available for transmitting said information carrying signal via said radio circuitry to said receiving node, the transmitting node comprising:

processing circuitry configured to determine a plurality of muting configurations, each muting configuration in said plurality of muting configurations corresponding to at least one transmission configuration in said plurality of transmission configurations, and to select a transmission configuration from said plurality of transmission configurations for transmitting said information carrying signal to said receiving node, the processing circuitry further configured to transmit, to said receiving node via said radio circuitry, a dynamic configuration message identifying, to said receiving node, at least one muting configuration out of said plurality of muting configurations that corresponds to said selected transmission configuration, and to transmit, via said radio circuitry, the information carrying signal to said receiving node in a transmission according to the selected transmission configuration, wherein the transmission is muted in accordance with the identified at least one muting configuration.

66. The transmitting node according to claim 65, wherein the radio circuitry is comprised in the transmitting node.