# US 12,224,830 B2 · Channel state information feedback in wireless communications

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- Number: US 12,224,830 B2
- Document ID: US12224830B2
- Status: Granted
- Kind: B2
- Application number: 17/593,489
- Filed: 2020-04-08
- Published: 2022-09-29
- Granted: 2025-02-11
- Earliest claimed: 2020-04-08
- Assignees: Apple Inc.
- Applicants: Apple Inc.
- Inventors: Hong He; Chunhai Yao; Dawei Zhang; Haitong Sun; Jie Cui; Wei Zeng; Yang Tang; Yushu Zhang
- Web page: https://patentgrep.com/patent/US12224830B2

## CPC

- H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]}
- H04L 1/1896: {ARQ related signaling}
- 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 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04W 74/006: {in the downlink, i.e. towards the terminal}
- H04L 1/1854: {Scheduling and prioritising arrangements}
- H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA]
- 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

Embodiments include a computer readable storage medium, a user equipment, a method and an integrated circuit that perform operations. The operations include receiving a downlink channel information (DCI) format 2_0 from a g-NodeB (gNB) connected to the 5G NR network, wherein the DCI format 2_0 includes channel occupancy time (COT) duration and a gap threshold value, determining if a nonzero power channel state information reference signal (NZP-CSI-RS) resource is valid, wherein the NZP-CSI-RS resource is valid if the NZP-CSI-RS resource is within the COT duration and if a gap between a last symbol of the DCI format 2_0 and a first symbol of the NZP-CSI-RS resource is greater than the gap threshold value.

## Claims

### Claim 1

A non-transitory computer readable storage medium comprising a set of instructions, wherein the set of instructions when executed by a processor of a user equipment (UE) connected to a 5G new radio (NR) network on a frequency band in an unlicensed spectrum cause the processor to perform operations comprising:
receiving a downlink channel information (DCI) format 2_0 from a g-NodeB (gNB) connected to the 5G NR network, wherein the DCI format 2_0 includes channel occupancy time (COT) duration and a gap threshold value;
determining whether a nonzero power channel state information reference signal (NZP-CSI-RS) resource is valid,
wherein the determining whether the NZP-CSI-RS resource is valid includes at least determining whether the NZP-CSI-RS resource is within the COT duration.

### Claim 2 (depends on 1)

The non-transitory computer readable storage medium of claim 1, wherein, if the NZP-CSI-RS resource is not valid, the operations further comprise:
determining if a subsequent NZP-CSI-RS resource is valid, wherein the subsequent NZP-CSI-RS resource is valid if the subsequent NZP-CSI-RS resource is within the COT duration and a second gap between the last symbol of the DCI format 2_0 and a first symbol of the subsequent NZP-CSI-RS resource is greater than the gap threshold value.

### Claim 3 (depends on 1)

The non-transitory computer readable storage medium of claim 1, wherein, if the NZP-CSI-RS resource is valid, the operations further comprise:
receiving a DCI format 0_1 transmission from the gNB, wherein the DCI format 0_1 includes a CSI request;
conducting a CSI measurement in response to the CSI request;
generating a CSI report including the CSI measurement; and
transmitting the CSI report to the gNB in a physical uplink shared channel (PUSCH).

### Claim 4 (depends on 3)

The non-transitory computer readable storage medium of claim 3, wherein the DCI format 0_1 includes an additional field indicating (a) whether the CSI request triggers a retransmission of the CSI report corresponding to a CSI request state to the gNB or (b) whether the CSI request triggers generation of a new CSI report corresponding to the CSI request state and transmittal to the gNB.

### Claim 5 (depends on 4)

The non-transitory computer readable storage medium of claim 4, wherein the additional field is a one-bit field including a Need Retransmission Indicator (NRI), wherein if the NRI is toggled, the CSI report corresponding to the CSI request state does not need to be retransmitted to the gNB, and if the NRI is not toggled, the CSI report corresponding to the CSI request state needs to be retransmitted to the gNB.

### Claim 6 (depends on 4)

The non-transitory computer readable storage medium of claim 4, wherein the additional field is a 2-bit field indicating (a) whether the CSI request triggers a retransmission of the CSI report corresponding to a CSI request state to the gNB; and (b) whether the CSI request triggers generation of a new CSI report corresponding to the CSI request state and transmittal to the gNB.

### Claim 7 (depends on 4)

The non-transitory computer readable storage medium of claim 4, wherein the UE includes a CSI validity timer defining a predetermined period of time during which the CSI report is valid and can be retransmitted if triggered by the gNB.

### Claim 8 (depends on 7)

The non-transitory computer readable storage medium of claim 7, wherein retransmission of the CSI report is not performed if the predetermined period of time has expired.

### Claim 9 (depends on 4)

The non-transitory computer readable storage medium of claim 4, wherein the retransmission occurs over configured grant PUSCH (CG-PUSCH).

### Claim 10 (depends on 9)

The non-transitory computer readable storage medium of claim 9, wherein the retransmission includes at least one field including a plurality of bits identifying which CSI reports are included in a payload of the retransmission.

### Claim 11

A user equipment (UE) connected to a 5G new radio (NR) network on a frequency band in an unlicensed spectrum, the UE comprising:
a processor configured to:
receive a downlink channel information (DCI) format 2_0 from a g-nodeB (gNB) connected to the 5G NR network, wherein the DCI format 2_0 includes channel occupancy time (COT) duration and a gap threshold value;
determine whether a nonzero power channel state information reference signal (NZP-CSI-RS) resource is valid,
wherein the determining whether the NZP-CSI-RS resource is valid includes at least determining whether the NZP-CSI-RS resource is within the COT duration.

### Claim 12 (depends on 11)

The UE of claim 11, wherein, if the NZP-CSI-RS resource is not valid, the processor is further configured to:
determine if a subsequent NZP-CSI-RS resource is valid, wherein the subsequent NZP-CSI-RS resource is valid if the subsequent NZP-CSI-RS resource is within the COT duration and a second gap between the last symbol of the DCI format 2_0 and a first symbol of the subsequent NZP-CSI-RS resource is greater than the gap threshold value.

### Claim 13 (depends on 11)

The UE of claim 11, wherein, if the NZP-CSI-RS resource is valid, the processor is further configured to receive a DCI format 0_1 transmission from the gNB, wherein the DCI format 0_1 includes a CSI request; conduct a CSI measurement in response to the CSI request; and generate a CSI report including the CSI measurement; wherein the UE further comprises:
a transceiver configured to transmit the CSI report to the gNB in a physical uplink shared channel (PUSCH).

### Claim 14 (depends on 13)

The UE of claim 13, wherein the DCI format 0_1 includes an additional field indicating (a) whether the CSI request triggers a retransmission of the CSI report corresponding to a CSI request state to the gNB or (b) whether the CSI request triggers generation of a new CSI report corresponding to the CSI request state and transmittal to the gNB.

### Claim 15 (depends on 14)

The UE of claim 14, wherein the additional field is a one-bit field including a Need Retransmission Indicator (NRI), wherein if the NRI is toggled, the CSI report corresponding to the CSI request state does not need to be retransmitted to the gNB, and if the NRI is not toggled, the CSI report corresponding to the CSI request state needs to be retransmitted to the gNB.

### Claim 16 (depends on 14)

The UE of claim 14, wherein the additional field is a 2-bit field indicating (a) whether the CSI request triggers a retransmission of the CSI report corresponding to the CSI request state to the gNB; and (b) whether the CSI request triggers generation of a new CSI report corresponding to the CSI request state and transmittal to the gNB.

### Claim 17 (depends on 14)

The UE of claim 14, wherein the UE further comprises:
a CSI validity timer defining a predetermined period of time during which the CSI report is valid and can be retransmitted if triggered by the gNB.

### Claim 18 (depends on 17)

The UE of claim 17, wherein retransmission of the CSI report is not performed if the predetermined period of time has expired.

### Claim 19 (depends on 14)

The UE of claim 14, wherein the retransmission occurs over configured grant PUSCH (CG-PUSCH).

### Claim 20 (depends on 19)

The UE of claim 19, wherein the retransmission includes at least one field including a plurality of bits identifying which CSI reports are included in a payload of the retransmission.