# US 12,603,686 B2 · Channel state information (CSI) reporting for new radio (NR) side-links

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- Number: US 12,603,686 B2
- Document ID: US12603686B2
- Status: Granted
- Kind: B2
- Application number: 18/125,798
- Filed: 2023-03-24
- Published: 2023-11-02
- Granted: 2026-04-14
- Earliest claimed: 2022-04-28
- Assignees: Apple Inc.
- Applicants: Apple Inc.
- Inventors: Haitong Sun; Wei Zeng; Chunxuan Ye; Dawei Zhang; Yushu Zhang; Zhibin Wu; Hong He
- Web page: https://patentgrep.com/patent/US12603686B2

## CPC

- H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]}
- H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information}
- H04L 5/0057: {Physical resource allocation for CQI}
- H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports}
- H04W 72/25: between terminals via a wireless link, e.g. sidelink
- H04W 92/18: between terminal devices
- 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

Aspects are described for a user equipment (UE) comprising a transceiver configured to enable wireless communication with a base station and a second UE, and a processor communicatively coupled to the transceiver. The processor is configured to determine one or more channel state information (CSI) reporting elements out of a set of CSI reporting elements. The processor is further configured to generate a MAC control element (MAC-CE) message. The MAC-CE message comprises an indicator that indicates a second MAC-CE message and a CSI report. The CSI report comprises the one or more CSI reporting elements. The processor is further configured to transmit, using the transceiver, the MAC-CE message to the second UE via a side-link connection.

## Claims

### Claim 1

A user equipment (UE) comprising:
a transceiver configured to enable wireless communications with a base station and a second UE; and
a processor, communicatively coupled to the transceiver, and configured to:
determine one or more channel state information (CSI) reporting elements out of a set of CSI reporting elements;
generate a MAC control element (MAC-CE) message, wherein the MAC-CE message comprises an indicator that indicates a second MAC-CE message to be transmitted within a predetermined time duration after the MAC-CE message is transmitted and a CSI report, and wherein the CSI report comprises the one or more CSI reporting elements; and
transmit, using the transceiver, the MAC-CE message to the second UE via a side-link connection.

### Claim 2 (depends on 1)

The UE of claim 1,
wherein the set of CSI reporting elements comprises a channel state information reference signal indicator (CRI), a synchronization signal block resource index (SSBRI), layer 1 reference signal received power (L1-RSRP), layer 1 signal to interference and noise ratio (L1-SINR), a precoder matrix indicator (PMI), a layer indicator (LI), and a coherent transmission indicator, and
wherein the processor is further configured to:
transmit, using the transceiver, the coherent transmission indicator to the base station using a radio resource control (RRC) message via a physical uplink shared channel (PUSCH); or
transmit, using the transceiver, the coherent transmission indicator to the second UE using a second RRC message via a physical side-link shared channel (PSSCH).

### Claim 3 (depends on 1)

The UE of claim 1, wherein the processor is further configured to:
generate a second CSI report that comprises additional one or more reporting elements of the set of CSI reporting elements; and
transmit, using the transceiver, the second CSI report to the second UE via a physical side-link shared channel (PSSCH) of the side-link connection.

### Claim 4 (depends on 1)

The UE of claim 1, wherein the processor is further configured to:
generate a second CSI report that comprises additional one or more reporting elements of the set of CSI reporting elements;
determine that a physical side-link feedback channel (PSFCH) of the side-link connection supports more than 2 bits; and
in response to the determining, transmit, using the transceiver, the second CSI report to the second UE via the PSFCH of the side-link connection.

### Claim 5 (depends on 1)

The UE of claim 1, wherein to transmit the MAC-CE message, the processor is further configured to:
receive a side-link control information (SCI) message from the second UE or a downlink control information (DCI) message from the base station.

### Claim 6 (depends on 5)

The UE of claim 5,
wherein the SCI message includes a CSI request field,
wherein the CSI request field includes one or more bits, and
wherein the processor is further configured to:
decode the CSI request field of the SCI message to determine the one or more bits; and
transmit, using the transceiver, the CSI report to the second UE based on the one or more bits.

### Claim 7 (depends on 1)

The UE of claim 1, wherein the processor is further configured to:
generate a plurality of CSI reports periodically;
transmit, using the transceiver, the plurality of CSI reports to the second UE via the side-link connection periodically; and
receive, using the transceiver, a configuration message from the base station via a higher layer signaling, wherein the configuration message includes a periodicity of the plurality of CSI reports.

### Claim 8 (depends on 1)

The UE of claim 1, wherein the processor is further configured to:
receive, using the transceiver, a configuration message from the base station via a higher layer signaling, wherein the configuration message indicates a semi-persistent CSI (SP-CSI) reporting;
receive, using the transceiver, an activation MAC-CE message;
generate a second CSI report based on the activation MAC-CE message, wherein the second CSI report comprises additional one or more reporting elements of the set of CSI reporting elements; and
transmit, using the transceiver, the second CSI report to the second UE via a physical side-link shared channel (PSSCH) or a physical side-link feedback channel (PSFCH) of the side-link connection.

### Claim 9 (depends on 1)

The UE of claim 1, wherein the processor is further configured to:
receive, using the transceiver, a configuration message from the base station via a higher layer signaling, wherein the configuration message indicates a semi-persistent CSI (SP-CSI) reporting;
receive, using the transceiver, a side-link control information (SCI) message from the second UE;
generate a second CSI report based on the CSI message, wherein the second CSI report comprises additional one or more reporting elements of the set of CSI reporting elements; and
transmit, using the transceiver, the second CSI report to the second UE via a physical side-link shared channel (PSSCH) or a physical side-link feedback channel (PSFCH) of the side-link connection.

### Claim 10 (depends on 1)

The UE of claim 1,
wherein the MAC-CE message indicates a layer 1 reference signal received power (L1-RSRP) level using a first number of bits,
wherein the second MAC-CE message indicates a differential L1-RSRP level relative to the L1-RSRP level using a second number of bits, and
wherein the first number is greater than the second number.

### Claim 11

A user equipment (UE) comprising:
a transceiver configured to enable wireless communications with a base station and a second UE; and
a processor, communicatively coupled to the transceiver, and configured to:
generate a side-link control information (SCI) message, wherein the SCI message is configured to trigger the second UE to generate a MAC control element (MAC-CE) message, wherein the MAC-CE message comprises an indicator that indicates a second MAC-CE message to be transmitted within a predetermined time duration after the MAC-CE message is transmitted and a channel state information (CSI) report, and wherein the CSI report comprises one or more CSI reporting elements out of a set of CSI reporting elements;
transmit, using the transceiver, the SCI message to the second UE via a side-link connection; and
receive, using the transceiver, the MAC-CE message from the second UE via the side-link connection.

### Claim 12 (depends on 11)

The UE of claim 11,
wherein the set of CSI reporting elements comprises a channel state information reference signal indicator (CRI), a synchronization signal block resource index (SSBRI), layer 1 reference signal received power (L1-RSRP), layer 1 signal to interference and noise ratio (L1-SINR), a precoder matrix indicator (PMI), a layer indicator (LI), and a coherent transmission indicator, and
wherein the processor is further configured to receive the coherent transmission indicator included in a radio resource control (RRC) message from the second UE via a physical side-link shared channel (PSSCH).

### Claim 13 (depends on 10)

The UE of claim 10, wherein the SCI message is further configured to trigger the second UE to:
generate a second CSI report that comprises one or more reporting elements of the set of CSI reporting elements; and
transmit the second CSI report to the UE via a physical side-link shared channel (PSSCH) of the side-link connection.

### Claim 14 (depends on 11)

The UE of claim 11, wherein the SCI message is further configured to trigger the second UE to:
generate a second CSI report that comprises one or more reporting elements of the set of CSI reporting elements;
determine that a physical side-link feedback channel (PSFCH) of the side-link connection supports more than 2 bits; and
in response to the determining, transmit the second CSI report to the UE via the PSFCH of the side-link connection.

### Claim 15 (depends on 11)

The UE of claim 11,
wherein the SCI message includes a CSI request field,
wherein the CSI request field includes one or more bits, and
wherein the SCI message is configured to trigger the second UE to decode the CSI request field of the SCI message to determine the one or more bits and transmit the CSI report to the UE based on the one or more bits.

### Claim 16 (depends on 11)

The UE of claim 11, wherein the processor is further configured to:
receive, using the transceiver, a plurality of CSI reports from the second UE via the side-link connection periodically; and
receive, using the transceiver, a configuration message from the base station via a higher layer signaling, wherein the configuration message includes a periodicity of the plurality of CSI reports.

### Claim 17

A base station comprising:
a transceiver configured to enable wireless communication with a user equipment (UE); and
a processor, communicatively coupled to the transceiver, and configured to:
generate a configuration message configured to cause the UE to generate a MAC control element (MAC-CE) message, wherein the MAC-CE message comprises an indicator that indicates a second MAC-CE message to be transmitted within a predetermined time duration after the MAC-CE message is transmitted and a channel state information (CSI) report, and wherein the CSI report comprises one or more CSI reporting elements out of a set of CSI reporting elements; and
transmit, using the transceiver, the configuration message to the UE via a higher layer signaling.

### Claim 18 (depends on 17)

The base station of claim 17,
wherein the set of CSI reporting elements comprises a channel state information reference signal indicator (CRI), a synchronization signal block resource index (SSBRI), layer 1 reference signal received power (L1-RSRP), layer 1 signal to interference and noise ratio (L1-SINR), a precoder matrix indicator (PMI), a layer indicator (LI), and a coherent transmission indicator, and
wherein the processor is further configured to receive the coherent transmission indicator included in a radio resource control (RRC) message via a physical uplink shared channel (PUSCH).

### Claim 19 (depends on 17)

The base station of claim 17, wherein the configuration message is further configured to cause the UE to:
generate a plurality of CSI reports periodically; and
transmit the plurality of CSI reports to a second UE via a side-link connection periodically.

### Claim 20 (depends on 17)

The base station of claim 17, wherein the configuration message is further configured to cause the UE to:
transmit a plurality of CSI reports to a second UE via a side-link connection semi-persistently.