Periodic channel state information reporting for coordinated multipoint (coMP) systems

Patent metadata

Field	Value
Publication number	US-9544801-B2
Application number	US-201213688794-A
Country	US
Kind code	B2
Filing date	Nov 29, 2012
Priority date	Aug 3, 2012
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

Technology for periodic channel state information (CSI) reporting in a coordinated multipoint (CoMP) scenario is disclosed. One method can include a user equipment (UE) generating a plurality of CSI reports for transmission in a subframe for a plurality of CSI processes. Each CSI report can correspond to a CSI process with a CSIProcessIndex. The UE can drop CSI reports corresponding to CSI processes except a CSI process with a lowest CSIProcessIndex. The UE can transmit at least one CSI report for the CSI process to an evolved Node B (eNB).

First claim

What is claimed is:

1. A user equipment (UE) operable to report periodic channel state information (CSI) configured in a specified transmission mode (TM), having computer circuitry configured to:
generate, at the UE, a plurality of CSI reports for serving cells for transmission in a subframe for a plurality of CSI processes for the UE operating in the specified TM used in a coordinated multipoint (CoMP) operation and carrier aggregation (CA) configuration, each of the CSI processes include a respective configuration of a channel and a corresponding interference part, wherein each CSI report corresponds to a physical uplink control channel (PUCCH) reporting type among a plurality of PUCCH reporting types, a CSI process among a plurality of CSI processes having a CSI process index (CSIProcessIndex) and a serving cell index (ServCellIndex) among a plurality of ServCellIndexes;
determine different priorities corresponding to each of the plurality of PUCCH reporting types;
determine a first collision between CSI reports, among the plurality of CSI reports, having PUCCH reporting types with equal priorities in the subframe and, upon determining the first collision, drop CSI reports corresponding to all CSI processes except a CSI process having the lowest CSIProcessIndex, wherein a CSI report for a specific ServCellIndex with a lower CSIProcessIndex has a higher priority than a CSI report for the specific ServCellIndex with a CSIProcessIndex higher than the lower CSIProcessIndex;
determine a second collision between CSI reports, after determining the first collision, among retained ones of the plurality of CSI reports, having CSIProcessIndexes with equal priorities in the subframe and, upon determining the second collision, drop CSI reports corresponding to all ServCellIndexes except a CSI report with the lowest ServCellIndex, wherein a CSI report for a specific CSIProcessIndex with a lower ServCellIndex has a higher priority than a CSI report for the specific CSIProcessIndex with a ServCellIndex that is higher than the lower ServCellIndex; and
prepare at least one non-colliding CSI report from among CSI reports that are not dropped;
multiplex a hybrid automatic repeat request-acknowledgement (HARQ-ACK) and the at least one non-colliding CSI report;
determine whether the at least one non-colliding CSI report with HARQ-ACK feedback bits and any scheduling request (SR) fits into a payload of the PUCCH format 3;
transmit the HARQ-ACK feedback bits including any SR without the at least one non-colliding CSI report when the at least one non-colliding CSI report with HARQ-ACK feedback bits and any SR does not fit into the payload; and
transmit the multiplexed HARQ-ACK feedback bits including any SR with the at least one non-colliding CSI report when the at least one non-colliding CSI report with HARQ-ACK feedback bits and any SR fits into the payload.

2. The computer circuitry of claim 1 , wherein the PUCCH format includes a PUCCH format 2, 2a, 2b, or 3.

3. The computer circuitry of claim 1 ,
wherein PUCCH reporting types 3, 5, 6, and 2a have a priority higher than PUCCH reporting types 1, 1a, 2, 2b, 2c, and 4, and PUCCH reporting types 2, 2b, 2c, and 4 have a priority higher than PUCCH reporting types 1 and 1a.

4. The computer circuitry of claim 1 , further configured to:
assign a highest priority CSI process to a default CSI process for a serving cell corresponding to a lowest CSIProcessIndex.

5. The computer circuitry of claim 1 , wherein the CSIProcessIndex is unique for a specified CSI process and a specified serving cell.

6. A wireless device configured for a periodic channel state information (CSI) transmission configured in a specified transmission mode (TM), comprising:
a processing module to:
generate, at the wireless device, a plurality of CSI reports for serving cells in a subframe for a plurality of CSI processes for the wireless device operating in the specified TM used in a coordinated multipoint (CoMP) operation and carrier aggregation (CA) configuration, each of the CSI processes include a respective configuration of a channel and a corresponding interference part, wherein each CSI report corresponds to a physical uplink control channel (PUCCH) reporting type among a plurality of PUCCH reporting types, a CSI process among a plurality of CSI processes having a CSI process index (CSIProcessIndex) and a serving cell index (ServCellIndex) among a plurality of ServCellIndexes;
determine different priorities corresponding to each of the plurality of PUCCH reporting types;
determine a first collision between CSI reports, among the plurality of CSI reports, having PUCCH reporting types with equal priorities in the subframe and, upon determining the first collision, drop CSI reports corresponding to all CSI processes except a CSI process having the lowest CSIProcessIndex, wherein a CSI report for a specific ServCellIndex with a lower CSIProcessIndex has a higher priority than a CSI report for the specific ServCellIndex with a CSIProcessIndex higher than the lower CSIProcessIndex;
determine a second collision between CSI reports, after determining the first collision, among retained ones of the plurality of CSI reports, having CSIProcessIndexes with equal priorities in the subframe and, upon determining the second collision, drop CSI reports corresponding to all ServCellIndexes except a CSI report with the lowest ServCellIndex, wherein a CSI report for a specific CSIProcessIndex with a lower ServCellIndex has a higher priority than a CSI report for the specific CSIProcessIndex with a ServCellIndex that is higher than the lower ServCellIndex;
prepare at least one non-colliding CSI report from among CSI reports that are not dropped;
multiplex a hybrid automatic repeat request-acknowledgement (HARQ-ACK) and the at least one non-colliding CSI report; and
determine whether the at least one non-colliding CSI report with HARQ-ACK feedback bits and any scheduling request (SR) fits into a payload of the PUCCH format 3; and

a transceiver module to:
transmit the HARQ-ACK feedback bits including any SR without the at least one non-colliding CSI report when the at least one non-colliding CSI report with HARQ-ACK feedback bits and any SR does not fit into the payload; and
transmit the multiplexed HARQ-ACK feedback bits including any SR with the at least one non-colliding CSI report when the at least one non-colliding CSI report with HARQ-ACK feedback bits and any SR fits into the payload.

7. The wireless device of claim 6 , wherein PUCCH reporting types with rank indication (RI) or wideband precoding matrix indicator (PMI) feedback without channel quality indicator (CQI) feedback have a priority higher than PUCCH reporting types with CQI feedback, and PUCCH reporting types with wideband CQI feedback have a priority higher than PUCCH reporting with sub-band CQI feedback.

8. The wireless device of claim 6 , wherein the processing module is further configured to:
prioritize the CSI reports based on the CSI process index, and then prioritize the CSI reports based on the serving cell index.

9. The wireless device of claim 6 , wherein the transceiver module is further configured to receive a priority for a CSI report with a specified CSI process index or a specified serving cell index via radio resource control (RRC) signaling.

10. The wireless device of claim 6 , wherein the processing module is further configured to:
prioritize the CSI reports based on a combined CSI process index and serving cell index, wherein the CSI report with a lower combined CSI process index and serving cell index has a higher priority than a CSI report with a higher combined CSI process index and serving cell index.

11. The

Assignees

• Intel Corp

Inventors

• Han Seunghee
• Davydov Alexei
• Fwu Jong-Kae
• Etemad Kamran

Classifications

• H04W12/06

  Authentication · CPC title

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04L5/00

  Arrangements affording multiple use of the transmission path · CPC title

• H04L41/0836

  to enhance reliability, e.g. reduce downtime · CPC title

• H04W74/0833

  Random access procedures, e.g. with 4-step access · CPC title