# US 10,122,429 B2 · Channel state information for enhanced carrier aggregation

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- Number: US 10,122,429 B2
- Document ID: US10122429B2
- Status: Granted
- Kind: B2
- Application number: 14/995,453
- Filed: 2016-01-14
- Published: 2016-07-21
- Granted: 2018-11-06
- Earliest claimed: 2015-01-16
- Assignees: QUALCOMM Incorporated
- Applicants: QUALCOMM Incorporated
- Inventors: Jelena Damnjanovic; Wanshi Chen; Peter Gaal; Aleksandar Damnjanovic
- Web page: https://patentgrep.com/patent/US10122429B2

## CPC

- H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]}
- H04L 5/001: {the frequencies being arranged in component carriers}
- H04L 5/0057: {Physical resource allocation for CQI}
- H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports}
- H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Methods, systems, and devices are described for wireless communication in a system that supports enhanced carrier aggregation (eCA). An eCA configuration with a large number of component carriers (CCs) may include CCs grouped into channel state information (CSI) reporting groups. Channel state reports for the CCs in each group may be reported together. In some cases, individual CC reports may be multiplexed into a single report, and in other cases a single channel state report may contain information related to each CC in the group. The combined reports may be transmitted over an uplink control channel or an uplink data channel, or both. Collisions between reports may be resolved based on the reporting type of the groups or the serving cell indices of the CCs in the group.

## Claims

### Claim 1

A method of wireless communication by a user equipment (UE), comprising:
identifying, by the UE, a channel state information (CSI) reporting configuration for each of a plurality of CSI reporting groups, wherein each CSI reporting group comprises a plurality of component carriers (CCs) from a set of component carriers in a carrier aggregation configuration of the UE;
determining, by the UE, CSI values for one or more CSI reporting groups, wherein the CSI values correspond to carriers in the plurality of CCs for the one or more CSI reporting groups, and wherein the CSI values for a CSI reporting group in the one or more CSI reporting groups include a CSI parameter for a reference component carrier and delta values based on the CSI parameter for the reference component carrier;
generating, by the UE, a combined report for each of the one or more CSI reporting groups based at least in part on the corresponding CSI reporting configuration, the combined reports each including the corresponding CSI values for a CSI reporting group in the one or more CSI reporting groups; and
transmitting, by the UE, one or more of the combined reports.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
determining a reference component carrier for each of the CSI reporting groups; and
identifying a CSI parameter for each reference component carrier.

### Claim 3 (depends on 1)

The method of claim 1, wherein each component carrier from the set of component carriers is associated with a CSI reporting group of the plurality of CSI reporting groups.

### Claim 4 (depends on 1)

The method of claim 1, wherein generating the combined report for each of the plurality of CSI reporting groups comprises:
multiplexing a plurality of CSI reports corresponding to the plurality of component carriers in the CSI reporting group, wherein each CSI report in the plurality of CSI reports is based at least part on an individual physical uplink control channel (PUCCH) format.

### Claim 5 (depends on 4)

The method of claim 4, wherein the transmitting further comprises:
transmitting hybrid automatic repeat request (HARQ) feedback with a first combined report on a first uplink (UL) control channel of a first UL component carrier; and
transmitting remaining combined reports on a second UL control channel of a second UL component carrier.

### Claim 6 (depends on 1)

The method of claim 1, wherein transmitting the one or more of the combined reports comprises:
transmitting the one or more combined reports on a physical uplink shared channel (PUSCH) according to a semi-persistent scheduling configuration of the UE.

### Claim 7 (depends on 6)

The method of claim 6, wherein at least one of the combined reports comprises at least one of HARQ feedback or a scheduling request (SR), or both.

### Claim 8 (depends on 7)

The method of claim 7, further comprising:
sending an indication that the at least one of the combined reports comprises HARQ feedback.

### Claim 9 (depends on 7)

The method of claim 7, wherein the one or more combined reports are jointly coded.

### Claim 10 (depends on 6)

The method of claim 6, further comprising:
transmitting data using remaining resources of the PUSCH according to the semi-persistent scheduling configuration of the UE.

### Claim 11 (depends on 1)

The method of claim 1, wherein each of the CSI reporting configurations comprises a CSI reporting periodicity, and wherein transmitting the one or more combined reports comprises:
transmitting the one or more combined reports based at least in part on the CSI reporting periodicity.

### Claim 12 (depends on 1)

The method of claim 1, further comprising:
identifying a collision between two or more of the combined reports; and
refraining from transmitting at least one of the two or more combined reports based at least in part on a prioritization scheme and when the collision is identified.

### Claim 13 (depends on 12)

The method of claim 12, wherein the prioritization scheme is based at least in part on a set of reporting types, and wherein each component carrier of the plurality of component carriers in each CSI reporting group has a same reporting type.

### Claim 14 (depends on 13)

The method of claim 13, wherein the prioritization scheme is further based at least in part on a lowest serving cell index.

### Claim 15

An apparatus for wireless communication, comprising:
means for identifying, by the apparatus, a carrier aggregation configuration comprising a set of component carriers (CCs);
means for identifying, by the apparatus, a channel state information (CSI) reporting configuration for each of a plurality of CSI reporting groups, wherein each CSI reporting group comprises a plurality of component carriers from the set of component carriers in the carrier aggregation configuration;
means for determining, by the apparatus, a reference component carrier for each of the CSI reporting groups;
means for identifying, by the apparatus, a CSI parameter for each reference component carrier;
means for determining, by the apparatus, CSI values for one or more CSI reporting groups, wherein the CSI values correspond to carriers in the plurality of CCs for the one or more CSI reporting groups, and wherein the CSI values for a CSI reporting group in the one or more CSI reporting groups include the CSI parameter for the reference component carrier and delta values based on the CSI parameter for the reference component carrier;
means for generating, by the apparatus, a combined report for each of the one or more CSI reporting groups based at least in part on the corresponding CSI reporting configuration, the combined reports each including the corresponding CSI values for a CSI reporting group in the one or more CSI reporting groups; and
means for transmitting, by the apparatus, one or more of the combined reports.

### Claim 16

An apparatus for wireless communication, comprising:
at least one processor;
memory in electronic communication with the at least one processor; and
instructions stored in the memory and operable, when executed by the at least one processor, to cause the apparatus to:
identify, by the apparatus, a carrier aggregation configuration comprising a set of component carriers (CCs);
identify, by the apparatus, a channel state information (CSI) reporting configuration for each of a plurality of CSI reporting groups, wherein each CSI reporting group comprises a plurality of component carriers from the set of component carriers in the carrier aggregation configuration;
determine, by the apparatus, CSI values for one or more CSI reporting groups, wherein the CSI values correspond to carriers in the plurality of CCs for the one or more CSI reporting groups, and wherein the CSI values for a CSI reporting group in the one or more CSI reporting groups include a CSI parameter for a reference component carrier and delta values based on the CSI parameter for the reference component carrier;
generate, by the apparatus, a combined report for each of the one or more CSI reporting groups based at least in part on the corresponding CSI reporting configuration, the combined reports each including the corresponding CSI values for a CSI reporting group in the one or more CSI reporting groups; and
transmit, by the apparatus, one or more of the combined reports.

### Claim 17 (depends on 16)

The apparatus of claim 16, wherein the instructions are operable to cause the apparatus to:
select a reference component carrier for each of the CSI reporting groups; and
identify a CSI parameter for each of the reference component carriers.

### Claim 18 (depends on 16)

The apparatus of claim 16, wherein the instructions are operable to cause the apparatus to:
multiplex a plurality of CSI reports corresponding to the plurality of component carriers in the CSI reporting group, wherein each CSI report in the plurality of CSI reports is based at least part on an individual physical uplink control channel (PUCCH) format.

### Claim 19 (depends on 18)

The apparatus of claim 18, wherein the instructions are operable to cause the apparatus to:
transmit the one or more of the combined reports on a first uplink (UL) control channel; and
transmit remaining combined reports on a second UL control channel on a different component carrier (CC) than the first UL control channel.

### Claim 20 (depends on 16)

The apparatus of claim 16, wherein the instructions are operable to cause the apparatus to:
transmit the one or more of the combined reports on a physical uplink shared channel (PUSCH) according to a semi-persistent scheduling configuration.

### Claim 21 (depends on 20)

The apparatus of claim 20, wherein the instructions are operable to cause the apparatus to:
transmit data using remaining resources of the PUSCH according to the semi-persistent scheduling configuration.

### Claim 22 (depends on 16)

The apparatus of claim 16, wherein each of the CSI reporting configurations comprises a CSI reporting periodicity, and wherein the instructions are operable to cause the apparatus to:
transmit the one or more combined reports based at least in part on the CSI reporting periodicity.

### Claim 23 (depends on 16)

The apparatus of claim 16, wherein the instructions are operable to cause the apparatus to:
identify a collision between two or more of the combined reports; and
refrain from transmitting at least one of the two or more combined reports based at least in part on a prioritization scheme and the identified collision.