# US 10,484,066 B2 · Beam management using synchronization signals through channel feedback framework

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- Number: US 10,484,066 B2
- Document ID: US10484066B2
- Status: Granted
- Kind: B2
- Application number: 15/943,586
- Filed: 2018-04-02
- Published: 2018-10-04
- Granted: 2019-11-19
- Earliest claimed: 2017-04-04
- Assignees: QUALCOMM Incorporated
- Applicants: QUALCOMM Incorporated
- Inventors: Sundar Subramanian; Xiao feng Wang; Junyi Li; Juergen Cezanne; Ashwin Sampath
- Web page: https://patentgrep.com/patent/US10484066B2

## CPC

- H04B 7/0619: {using feedback from receiving side (feedback signaling for adaptive modulation/coding H04L1/0001)}
- H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]}
- H04B 7/0608: {Antenna selection according to transmission parameters}
- H04B 7/063: {Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection}
- H04B 7/0632: {Channel quality parameters, e.g. channel quality indicator [CQI]}
- H04B 7/0643: {Feedback on request}
- H04B 7/06952: {Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04L 25/0224: {using sounding signals}
- H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports}
- H04W 56/0015: {one node acting as a reference for the others}
- H04L 5/0023: {Time-frequency-space}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- 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 for wireless communication are described. In aspects of the present disclosure, a user equipment (UE) may report metrics (e.g., received signal power, beam identifier) about synchronization signal (SS) beams using the same (e.g., or a similar) framework that is used for channel state information reference signal (CSI-RS) reporting. Because SSs are intended to be broadcast across a wide coverage area in a beamformed manner, the SSs represent a promising complement to existing beam management techniques. Accordingly, beam management may be achieved at least in part based on reporting one or more metrics of beamformed SSs through a channel feedback framework.

## Claims

### Claim 1

A method for wireless communication at a user equipment (UE), comprising:
identifying a first feedback resource set and a first reporting configuration according to a channel state information (CSI) framework that indicates a plurality of synchronization signal (SS) blocks of an SS burst transmitted by a base station using a first set of transmission beams;
performing first channel measurements for the plurality of SS blocks;
reporting, to the base station, a first resource indicator for at least one of the plurality of SS blocks based at least in part on the first channel measurements;
obtaining a second feedback resource set and a second reporting configuration according to the CSI framework, wherein the second feedback resource set and the second reporting configuration identify a set of resources associated with a CSI reference signal (CSI-RS) transmitted by the base station using a second set of transmission beams;
performing second channel measurements for the CSI-RS; and
reporting according to the second reporting configuration, to the base station based at least in part on the second channel measurements, at least one channel metric for at least one of the set of resources associated with the CSI-RS and a second resource indicator of the at least one of the set of resources.

### Claim 2 (depends on 1)

The method of claim 1, wherein identifying the first feedback resource set and the first reporting configuration comprises: receiving the first feedback resource set and the first reporting configuration from the base station.

### Claim 3 (depends on 1)

The method of claim 1, wherein reporting, to the base station, the first indicator comprises:
reporting a channel metric associated with the at least one of the plurality of SS blocks.

### Claim 4 (depends on 1)

The method of claim 1, wherein the reporting, to the base station, the first indicator occurs periodically, semi-persistently, or aperiodically as identified by the first reporting configuration.

### Claim 5 (depends on 4)

The method of claim 4, wherein reporting aperiodically occurs based at least in part on a trigger, wherein the trigger comprises:
receiving a reporting indicator in a downlink control information message or identifying a triggering event based at least in part on the first channel measurements.

### Claim 6 (depends on 1)

The method of claim 1, wherein reporting, to the base station, the first indicator comprises:
reporting an indicator of an antenna port for at least one of the plurality of SS blocks.

### Claim 7 (depends on 1)

The method of claim 1, wherein the plurality of SS blocks comprises a subset of SS blocks of the SS burst.

### Claim 8 (depends on 1)

The method of claim 1, further comprising:
identifying a waveform for the plurality of SS blocks for performing the first channel measurements based at least in part on decoding at least one SS block of the SS burst.

### Claim 9 (depends on 1)

The method of claim 1, wherein the first feedback resource set and the first reporting configuration comprise a spatial quasi-colocation indicator for at least one of the plurality of SS blocks, an indicator of resources for the plurality of SS blocks, an indicator of a duration of the SS burst, an indicator of antenna ports associated with the plurality of SS blocks, an indicator of a number of SS blocks of the SS burst, an indicator of a channel metric for reporting for the plurality of SS blocks, or a combination thereof.

### Claim 10

A method for wireless communication at a base station, comprising:
configuring, for a user equipment (UE), a first feedback resource set and a first reporting configuration according to a channel state information (CSI) framework that indicates a plurality of synchronization signal (SS) blocks of an SS burst transmitted by the base station using a first set of transmission beams;
receiving, from the UE, a first resource indicator of at least one of the plurality of SS blocks;
determining a characteristic of a transmission beam for a data or control transmission to the UE based at least in part on the first resource indicator;
configuring, for the UE, a second feedback resource set and a second reporting configuration according to the CSI framework, wherein the second feedback resource set and the second reporting configuration identify a set of resources associated with a CSI reference signal (CSI-RS) transmitted by the base station using a second set of transmission beams; and
receiving, from the UE, at least one channel metric for at least one of the set of resources associated with the CSI-RS and a second resource indicator of the at least one of the set of resources, wherein the determining the characteristic of the transmission beam is based at least in part on the at least one channel metric.

### Claim 11 (depends on 10)

The method of claim 10, wherein receiving, from the UE, the first resource indicator comprises:
receiving a channel metric associated with the at least one of the plurality of SS blocks.

### Claim 12 (depends on 10)

The method of claim 10, wherein receiving, from the UE, the first resource indicator comprises:
receiving an indicator of an antenna port for the at least one of the plurality of SS blocks.

### Claim 13 (depends on 10)

The method of claim 10, wherein the first feedback resource set and the first reporting configuration comprise an indication for periodic, semi-persistent, or aperiodic reporting, a spatial quasi-colocation indicator for at least one of the plurality of SS blocks, an indicator of resources for the plurality of SS blocks, an indicator of a duration of the SS burst, an indicator of antenna ports associated with the plurality of SS blocks, an indicator of a number of SS blocks of the SS burst, an indicator of a channel metric for reporting for the plurality of SS blocks, or a combination thereof.

### Claim 14 (depends on 10)

The method of claim 10, wherein the plurality of SS blocks comprises a subset of SS blocks of the SS burst.

### Claim 15

An apparatus for wireless communication at a user equipment (UE), comprising:
a processor,
memory in electronic communication with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
identify a first feedback resource set and a first reporting configuration according to a channel state information (CSI) framework that indicates a plurality of synchronization signal (SS) blocks of an SS burst transmitted by a base station using a first set of transmission beams;
perform first channel measurements for the plurality of SS blocks;
report, to the base station, a first resource indicator for at least one of the plurality of SS blocks based at least in part on the first channel measurements;
obtain a second feedback resource set and a second reporting configuration according to the CSI framework, wherein the second feedback resource set and the second reporting configuration identify a set of resources associated with a CSI reference signal (CSI-RS) transmitted by the base station using a second set of transmission beams;
perform second channel measurements for the CSI-RS; and
report according to the second reporting configuration, to the base station based at least in part on the second channel measurements, at least one channel metric for at least one of the set of resources associated with the CSI-RS and a second resource indicator of the at least one of the set of resources.

### Claim 16 (depends on 15)

The apparatus of claim 15, wherein the instructions to identify the first feedback resource set and the first reporting configuration are executable by the processor to cause the apparatus to:
receive the first feedback resource set and the first reporting configuration from the base station.

### Claim 17 (depends on 15)

The apparatus of claim 15, wherein the instructions to report, to the base station, the first resource indicator are executable by the processor to cause the apparatus to:
report a channel metric associated with the at least one of the plurality of SS blocks.

### Claim 18 (depends on 15)

The apparatus of claim 15, wherein the reporting occurs periodically, semi-persistently, or aperiodically as identified by the first reporting configuration.

### Claim 19 (depends on 18)

The apparatus of claim 18, wherein the instructions to report aperiodically occurs based at least in part on a trigger executable by the processor to cause the apparatus to:
receive a reporting indicator in a downlink control information message or identifying a triggering event based at least in part on the first channel measurements.

### Claim 20 (depends on 15)

The apparatus of claim 15, wherein the instructions to report, to the base station, the first resource indicator are executable by the processor to cause the apparatus to:
report an indicator of an antenna port for at least one of the plurality of SS blocks.

### Claim 21 (depends on 15)

The apparatus of claim 15, wherein the plurality of SS blocks comprises a subset of SS blocks of the SS burst.

### Claim 22 (depends on 15)

The apparatus of claim 15, wherein the instructions are further executable by the processor to cause the apparatus to:
identify a waveform for the plurality of SS blocks for performing the first channel measurements based at least in part on decoding at least one SS block of the SS burst.

### Claim 23 (depends on 15)

The apparatus of claim 15, wherein the first feedback resource set and the first reporting configuration comprise a spatial quasi-colocation indicator for at least one of the plurality of SS blocks, an indicator of resources for the plurality of SS blocks, an indicator of a duration of the SS burst, an indicator of antenna ports associated with the plurality of SS blocks, an indicator of a number of SS blocks of the SS burst, an indicator of a channel metric for reporting for the plurality of SS blocks, or a combination thereof.

### Claim 24

An apparatus for wireless communication at a base station, comprising:
a processor,
memory in electronic communication with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
configure, for a user equipment (UE), a first feedback resource set and a first reporting configuration according to a channel state information (CSI) framework that indicates a plurality of synchronization signal (SS) blocks of an SS burst transmitted by the base station using a first set of transmission beams;
receive, from the UE, a first resource indicator of at least one of the plurality of SS blocks;
determine a characteristic of a transmission beam for a data or control transmission to the UE based at least in part on the first resource indicator;
configure, for the UE, a second feedback resource set and a second reporting configuration according to the CSI framework, wherein the second feedback resource set and the second reporting configuration identify a set of resources associated with a CSI reference signal (CSI-RS) transmitted by the base station using a second set of transmission beams; and
receive, from the UE, at least one channel metric for at least one of the set of resources associated with the CSI-RS and a second resource indicator of the at least one of the set of resources, wherein the determining the characteristic of the transmission beam is based at least in part on the at least one channel metric.

### Claim 25 (depends on 24)

The apparatus of claim 24, wherein the instructions to receive, from the UE, the first resource indicator are executable by the processor to cause the apparatus to:
receive a channel metric associated with the at least one of the plurality of SS blocks.

### Claim 26 (depends on 24)

The apparatus of claim 24, wherein the instructions to receive, from the UE, the first resource indicator are executable by the processor to cause the apparatus to:
receive an indicator of an antenna port for the at least one of the plurality of SS blocks.

### Claim 27 (depends on 24)

The apparatus of claim 24, wherein the first feedback resource set and the first reporting configuration comprise an indication for periodic, semi-persistent, or aperiodic reporting, a spatial quasi-colocation indicator for at least one of the plurality of SS blocks, an indicator of resources for the plurality of SS blocks, an indicator of a duration of the SS burst, an indicator of antenna ports associated with the plurality of SS blocks, an indicator of a number of SS blocks of the SS burst, an indicator of a channel metric for reporting for the plurality of SS blocks, or a combination thereof.

### Claim 28 (depends on 24)

The apparatus of claim 24, wherein the plurality of SS blocks comprises a subset of SS blocks of the SS burst.

### Claim 29

An apparatus for wireless communication at a user equipment (UE), comprising:
means for identifying a first feedback resource set and a first reporting configuration according to a channel state information (CSI) framework that indicates a plurality of synchronization signal (SS) blocks of an SS burst transmitted by a base station using a first set of transmission beams;
means for performing first channel measurements for the plurality of SS blocks;
means for reporting, to the base station, a first resource indicator for at least one of the plurality of SS blocks based at least in part on the first channel measurements;
means for obtaining a second feedback resource set and a second reporting configuration according to the CSI framework, wherein the second feedback resource set and the
second reporting configuration identify a set of resources associated with a CSI reference signal
(CSI-RS1 transmitted by the base station using a second set of transmission beams;
means for performing second channel measurements for the CSI-RS; and
means for reporting according to the second reporting configuration, to the base station based at least in part on the second channel measurements, at least one channel metric for at least one of the set of resources associated with the CSI-RS and a second resource indicator of the at least one of the set of resources.

### Claim 30

An apparatus for wireless communication at a base station, comprising:
means for configuring, for a user equipment (UE), a first feedback resource set and a first reporting configuration according to a channel state information (CSI) framework that indicates a plurality of synchronization signal (SS) blocks of an SS burst transmitted by the base station using a first set of transmission beams;
means for receiving, from the UE, a first resource indicator of at least one of the plurality of SS blocks;
means for determining a characteristic of a transmission beam for a data or control transmission to the UE based at least in part on the first resource indicator;
means for configuring, for the UE, a second feedback resource set and a second reporting configuration according to the CSI framework, wherein the second feedback resource set and the second reporting configuration identify a set of resources associated with a CSI reference signal (CSI-RS) transmitted by the base station using a second set of transmission beams; and
means for receiving, from the UE, at least one channel metric for at least one of the set of resources associated with the CSI-RS and a second resource indicator of the at least one of the set of resources, wherein the determining the characteristic of the transmission beam is based at least in part on the at least one channel metric.

### Claim 31

A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable by a processor to:
identify a first feedback resource set and a first reporting configuration according to a channel state information (CSI) framework that indicates a plurality of synchronization signal (SS) blocks of an SS burst transmitted by a base station using a first set of transmission beams;
perform first channel measurements for the plurality of SS blocks;
report, to the base station, a first resource indicator for at least one of the plurality of SS blocks based at least in part on the first channel measurements;
obtain a second feedback resource set and a second reporting configuration according to the CSI framework, wherein the second feedback resource set and the second reporting configuration identify a set of resources associated with a CSI reference signal (CSI-RS) transmitted by the base station using a second set of transmission beams;
perform second channel measurements for the CSI-RS; and
report according to the second reporting configuration, to the base station based at least in part on the second channel measurements, at least one channel metric for at least one of the set of resources associated with the CSI-RS and a second resource indicator of the at least one of the set of resources.

### Claim 32

A non-transitory computer-readable medium storing code for wireless communication at a base station, the code comprising instructions executable by a processor to:
configure, for a user equipment (UE), a first feedback resource set and a first reporting configuration according to a channel state information (CSI) framework that indicates a plurality of synchronization signal (SS) blocks of an SS burst transmitted by the base station using a first set of transmission beams;
receive, from the UE, a first resource indicator of at least one of the plurality of SS blocks;
determine a characteristic of a transmission beam for a data or control transmission to the UE based at least in part on the first resource indicator;
configure, for the UE, a second feedback resource set and a second reporting configuration according to the CSI framework, wherein the second feedback resource set and the second reporting configuration identify a set of resources associated with a CSI reference signal (CSI-RS) transmitted by the base station using a second set of transmission beams; and
receive, from the UE, at least one channel metric for at least one of the set of resources associated with the CSI-RS and a second resource indicator of the at least one of the set of resources, wherein the determining the characteristic of the transmission beam is based at least in part on the at least one channel metric.