# US 2021/0243735 A1 · Determination of physical downlink control channel receive time based on physical downlink shared channel reference symbol

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- Number: US 2021/0243735 A1
- Document ID: US20210243735A1
- Status: Published application
- Kind: A1
- Application number: 17/159,408
- Filed: 2021-01-27
- Published: 2021-08-05
- Earliest claimed: 2020-01-31
- Assignees: QUALCOMM Incorporated
- Applicants: QUALCOMM Incorporated
- Inventors: Zhifei FAN; Jing SUN; Xiaoxia ZHANG; Tao LUO; Srinivas YERRAMALLI; Arumugam CHENDAMARAI KANNAN; Wooseok NAM; Sungwoo PARK; Ahmed Abdelaziz Ibrahim Abdelaziz ZEWAIL; Akula Aneesh REDDY
- Web page: https://patentgrep.com/patent/US20210243735A1

## CPC

- H04L 1/0072: {Error control for data other than payload data, e.g. control data}
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04L 1/0027: {Scheduling of signalling, e.g. occurrence thereof}
- 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 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- 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

In an aspect, a PDCCH and a PDSCH are transmitted by a BS to a UE, whereby the PDCCH includes a first DCI part and the PDSCH includes a second DCI part (e.g., a 2-part DCI). In an example, the BS and UE each determine at least one timing value associated with an effective receive time for the PDCCH based upon a reference symbol of the PDSCH.

## Claims

### Claim 1

A method of operating a user equipment (UE), comprising:
receiving, during at least one slot, transmission from a base station of a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH), the PDCCH including a first part of a Downlink Control Information (DCI), the PDSCH including a second part of the DCI; and
determining at least one timing value associated with an effective receive time for the PDCCH based upon a reference symbol of the PDSCH.

### Claim 2 (depends on 1)

The method of claim 1, wherein the first and second parts of the DCI comprise a two-part DCI.

### Claim 3 (depends on 1)

The method of claim 1, wherein the first part of the DCI includes a control information field associated with the second part of the DCI within the PDSCH.

### Claim 4 (depends on 1)

The method of claim 1, wherein the reference symbol of the PDSCH corresponds to a last symbol of the second part of the DCI within the PDSCH.

### Claim 5 (depends on 1)

The method of claim 1, wherein the reference symbol of the PDSCH corresponds to a last symbol of the PDSCH.

### Claim 6 (depends on 1)

The method of claim 1, wherein the reference symbol of the PDSCH is offset from a last symbol of the second part of the DCI within the PDSCH.

### Claim 7 (depends on 6)

The method of claim 6,
wherein the offset is pre-defined, or
wherein the offset is configured via higher-layer signaling.

### Claim 8 (depends on 6)

The method of claim 6, wherein the offset is a function of a number of Demodulation Reference Signals (DMRSs) after the last symbol of the second part of the DCI within the PDSCH.

### Claim 9 (depends on 1)

The method of claim 1, wherein, if there is a Demodulation Reference Signal (DMRS) after a last symbol of the second part of the DCI within the PDSCH, then the reference symbol corresponds to a last symbol of a first DMRS instance after the last symbol of the second part of the DCI within the PDSCH.

### Claim 10 (depends on 1)

The method of claim 1, wherein the at least one timing value comprises:
a time offset between the effective receive time for the PDCCH and a channel state information (C SI) report,
a time offset between the effective receive time for the PDCCH and a Physical Uplink Shared Channel (PUSCH) communication,
a time offset between the effective receive time for the PDCCH and a PDSCH communication, or
a time offset between the effective receive time for the PDCCH and a Sounding Reference Signal (SRS) communication, or
any combination thereof.

### Claim 11 (depends on 10)

The method of claim 10, further comprising:
performing, based on the at least one timing value, one or more of:
transmitting the CSI report, or
transmitting the PUSCH communication, or
receiving the PDSCH communication, or
receiving the SRS communication, or
any combination thereof.

### Claim 12 (depends on 1)

The method of claim 1,
wherein the second part of the DCI comprises one or more downlink (DL) grants, one or more uplink (UL) grants, or a combination thereof, or
wherein the second part of the DCI comprises a first grant associated with a first UE and a second grant associated with a second UE, or
a combination thereof.

### Claim 13

A method of operating a base station, comprising:
scheduling, during at least one slot, transmission of a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH), the PDCCH including a first part of a Downlink Control Information (DCI), the PDSCH including a second part of the DCI;
determining at least one timing value associated with an effective receive time for the PDCCH based upon a reference symbol of the PDSCH; and
transmitting the PDCCH and the PDSCH during the at least one slot.

### Claim 14 (depends on 13)

The method of claim 13, wherein the first and second parts of the DCI comprise a two-part DCI.

### Claim 15 (depends on 13)

The method of claim 13, wherein the first part of the DCI includes a control information field associated with the second part of the DCI within the PDSCH.

### Claim 16 (depends on 13)

The method of claim 13, wherein the reference symbol of the PDSCH corresponds to a last symbol of the second part of the DCI within the PDSCH.

### Claim 17 (depends on 13)

The method of claim 13, wherein the reference symbol of the PDSCH corresponds to a last symbol of the PDSCH.

### Claim 18 (depends on 13)

The method of claim 13, wherein the reference symbol of the PDSCH is offset from a last symbol of the second part of the DCI within the PDSCH.

### Claim 19 (depends on 18)

The method of claim 18,
wherein the offset is pre-defined, or
wherein the offset is configured via higher-layer signaling.

### Claim 20 (depends on 18)

The method of claim 18, wherein the offset is a function of a number of Demodulation Reference Signals (DMRSs) after the last symbol of the second part of the DCI within the PDSCH.

### Claim 21 (depends on 13)

The method of claim 13, wherein, if there is a Demodulation Reference Signal (DMRS) after a last symbol of the second part of the DCI within the PDSCH, then the reference symbol corresponds to a last symbol of a first DMRS instance after the last symbol of the second part of the DCI within the PDSCH.

### Claim 22 (depends on 13)

The method of claim 13, wherein the at least one timing value comprises:
a time offset between the effective receive time for the PDCCH and a channel state information (CSI) report,
a time offset between the effective receive time for the PDCCH and a Physical Uplink Shared Channel (PUSCH) communication,
a time offset between the effective receive time for the PDCCH and a PDSCH communication, or
a time offset between the effective receive time for the PDCCH and a Sounding Reference Signal (SRS) communication, or
any combination thereof.

### Claim 23 (depends on 22)

The method of claim 22, further comprising:
performing, based on the at least one timing value, one or more of:
receiving the CSI report, or
receiving the PUSCH communication, or
transmitting the PDSCH communication, or
receiving the SRS communication, or
any combination thereof.

### Claim 24 (depends on 13)

The method of claim 13,
wherein the second part of the DCI comprises one or more downlink (DL) grants, one or more uplink (UL) grants, or a combination thereof, or
wherein the second part of the DCI comprises a first grant associated with a first UE and a second grant associated with a second UE, or
a combination thereof.

### Claim 25

A user equipment (UE), comprising:
a memory; and
at least one processor coupled to the memory and configured to:
receive, during at least one slot, transmission from a base station of a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH), the PDCCH including a first part of a Downlink Control Information (DCI), the PDSCH including a second part of the DCI; and
determine at least one timing value associated with an effective receive time for the PDCCH based upon a reference symbol of the PDSCH.

### Claim 26 (depends on 25)

The UE of claim 25,
wherein the reference symbol of the PDSCH corresponds to a last symbol of the second part of the DCI within the PDSCH, or
wherein the reference symbol of the PDSCH corresponds to a last symbol of the PDSCH, or
wherein the reference symbol of the PDSCH is offset from a last symbol of the second part of the DCI within the PDSCH, or
any combination thereof.

### Claim 27 (depends on 25)

The UE of claim 25, wherein the at least one timing value comprises:
a time offset between the effective receive time for the PDCCH and a channel state information (C SI) report,
a time offset between the effective receive time for the PDCCH and a Physical Uplink Shared Channel (PUSCH) communication,
a time offset between the effective receive time for the PDCCH and a PDSCH communication, or
a time offset between the effective receive time for the PDCCH and a Sounding Reference Signal (SRS) communication, or
any combination thereof.

### Claim 28

A base station, comprising:
a memory; and
at least one processor coupled to the memory and configured to:
schedule, during at least one slot, transmission of a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH), the PDCCH including a first part of a Downlink Control Information (DCI), the PDSCH including a second part of the DCI;
determine at least one timing value associated with an effective receive time for the PDCCH based upon a reference symbol of the PDSCH; and
transmit the PDCCH and the PDSCH during the at least one slot.

### Claim 29 (depends on 28)

The base station of claim 28,
wherein the reference symbol of the PDSCH corresponds to a last symbol of the second part of the DCI within the PDSCH, or
wherein the reference symbol of the PDSCH corresponds to a last symbol of the PDSCH, or
wherein the reference symbol of the PDSCH is offset from a last symbol of the second part of the DCI within the PDSCH.

### Claim 30 (depends on 28)

The base station of claim 28, wherein the at least one timing value comprises:
a time offset between the effective receive time for the PDCCH and a channel state information (C SI) report,
a time offset between the effective receive time for the PDCCH and a Physical Uplink Shared Channel (PUSCH) communication,
a time offset between the effective receive time for the PDCCH and a PDSCH communication, or
a time offset between the effective receive time for the PDCCH and a Sounding Reference Signal (SRS) communication, or
any combination thereof.