Method and radio node for handling CSI reporting

• US 10,251,081 B2
• Filed: 05/08/2017
• Issued: 04/02/2019
• Est. Priority Date: 08/15/2013
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Song, Xinghua, Li, Shaohua, Guo, Zhiheng, Fan, Rui, Liu, Jinhua
• Primary Examiner(s): Roberts, Brian S
• Application Number:
  US15/589,455
• Publication Number:
  US 20170245169A1
• Time in Patent Office: 694 Days
• Field of Search: None
• CPC Class Codes: H04B 17/309 Measuring or estimating channel quality parameters
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0027 Scheduling of signalling, e.g. occurrence thereof
• CPC Class Codes: H04L 1/1822 involving configuration of automatic repeat request [ARQ] with parallel processes
• CPC Class Codes: H04L 5/00 Arrangements affording multiple use of the transmission path
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Separate aperiodic channel state information (CSI) reports are handled for static subframe(s), in which the direction of signal transmission is fixed, and flexible subframe(s), in which the direction of signal transmission is variable. A method by a UE includes receiving a trigger for an aperiodic CSI report as part of an uplink (UL) grant from a radio node in a static downlink (DL) subframe, where the trigger indicates a CSI subframe set, out of at least two alternative CSI subframe sets. An aperiodic CSI measurement is performed for a CSI reference resource in the indicated CSI subframe set, and the result of the CSI measurement is reported to the radio node. One of the at least two alternative CSI subframe sets relates to the one or more static subframes, and another one of the at least two alternative CSI subframe sets relates to the one or more flexible subframes.

Claims

1. A method performed by a User Equipment, UE, for handling separate aperiodic channel state information, CSI, reports for one or more static subframes, in which the direction of signal transmission is fixed, and one or more flexible subframes, in which the direction of signal transmission is variable, the method comprising:

receiving a trigger for an aperiodic CSI report as part of an uplink, UL, grant from a radio node in a static downlink, DL, subframe, said trigger indicating one or more CSI processes and a CSI subframe set related to the one or more static subframes;

performing an aperiodic CSI measurement for a CSI reference resource in the CSI subframe set;

reporting a result of the aperiodic CSI measurement to the radio node, in a CSI reporting subframe;

receiving a second trigger for a second aperiodic CSI report as part of a second UL grant from the radio node in a second static DL subframe, said second trigger indicating one or more second CSI processes and a second CSI subframe set that relates to the one or more flexible subframes;

performing a second aperiodic CSI measurement for a second CSI reference resource in the second CSI subframe set; and

reporting a result of the second aperiodic CSI measurement to the radio node, in a second CSI reporting subframe.

2. The method according to claim 1, wherein the CSI reference resource is defined, in the time domain, as a single downlink subframe n-nCQI_ref, where nCQI_ref is an offset such that the single downlink subframe is a valid downlink subframe belonging to the CSI subframe set.

3. The method according to claim 1, further comprising receiving a configuration change that changes at least one of the one or more flexible subframes.

4. A method performed by a radio node for handling separate aperiodic Channel State Information, CSI, reports for one or more static subframes, in which the direction of signal transmission is fixed, and one or more flexible subframes, in which the direction of signal transmission is variable, the method comprising:

indicating to a User Equipment, UE, in an uplink, UL, grant in a static downlink, DL, subframe, one or more CSI processes and a first CSI subframe set in which the UE should perform an aperiodic CSI measurement for a first CSI reference resource, where the first CSI subframe sets relates to the one or more static subframes;

receiving, in a CSI reporting subframe, a CSI report from the UE comprising a result of the aperiodic CSI measurement;

indicating to the UE, in a second UL grant in a second DL subframe, one or more second CSI processes and a second CSI subframe set in which the UE should perform a second aperiodic CSI measurement for a second CSI reference resource, where the second CSI subframe sets relates to the one or more flexible subframes;

receiving, in a second CSI reporting subframe, a second CSI report from the UE comprising a result of the second aperiodic CSI measurement.

5. The method according to claim 4, wherein the CSI reference resource is defined, in the time domain, as a single downlink subframe n-nCQI_ref, where nCQI_ref is an offset such that the single downlink subframe is a valid downlink subframe belonging to the CSI subframe set.

6. The method according to claim 4, further comprising indicating to the UE a configuration change that changes at least one of the one or more flexible subframes.

7. A User Equipment, UE, for handling separate aperiodic channel state information, CSI, reports for one or more static subframes, in which the direction of signal transmission is fixed, and one or more flexible subframes, in which the direction of signal transmission is variable, the UE comprising a processor, the processor configured to perform operations comprising:

receiving a trigger for an aperiodic CSI report as part of an uplink, UL, grant from a radio node in a static downlink, DL, subframe;

said trigger indicating one or more CSI processes and a CSI subframe set related to the one or more static subframes;

performing an aperiodic CSI measurement for a CSI reference resource in the CSI subframe set;

reporting a result of the aperiodic CSI measurement to the radio node in a CSI reporting subframe;

receiving a second trigger for a second aperiodic CSI report as part of a second UL grant from the radio node in a second static DL subframe, said second trigger indicating one or more second CSI processes and a second CSI subframe set that relates to the one or more flexible subframes;

performing a second aperiodic CSI measurement for a second CSI reference resource in the second CSI subframe set; and

reporting a result of the second aperiodic CSI measurement to the radio node, in a second CSI reporting subframe.

8. The User Equipment according to claim 7, wherein the CSI reference resource is defined, in the time domain, as a single downlink subframe n-nCQI_ref, where nCQI_ref is an offset such that the single downlink subframe is a valid downlink subframe belonging to the CSI subframe set.

9. The User Equipment according to claim 7, further comprising:

receiving, from the radio node, a configuration change that changes at least one of the one or more flexible subframes.

10. A radio node for handling separate aperiodic Channel State Information, CSI, reports for one or more static subframes, in which the direction of signal transmission is fixed, and one or more flexible subframes, in which the direction of signal transmission is variable, the radio node comprising a processor, the processor configured to perform operations comprising:

indicating to a User Equipment, UE, in an uplink, UL, grant in a static downlink, DL, subframe, one or more CSI processes and a first CSI subframe set in which the UE should perform an aperiodic CSI measurement for a first CSI reference resource, where the first CSI subframe sets relates to the one or more static subframes;

receiving, in a CSI reporting subframe, a CSI report from the UE comprising a result of the aperiodic CSI measurement;

indicating to the UE, in a second UL grant in a second DL subframe, one or more second CSI processes and a second CSI subframe set in which the UE should perform a second aperiodic CSI measurement for a second CSI reference resource, where the second CSI subframe sets relates to the one or more flexible subframes;

receiving, in a second CSI reporting subframe, a second CSI report from the UE comprising a result of the second aperiodic CSI measurement.

11. The radio node according to claim 10, wherein the CSI reference resource is defined, in the time domain, as a single downlink subframe n-nCQI_ref, where nCQI_ref is an offset such that the single downlink subframe is a valid downlink subframe belonging to the CSI subframe set.

12. The radio node according to claim 10, wherein the operations further comprise indicating to the UE a configuration change that changes at least one of the one or more flexible subframes.