# US 12,003,435 B2 · Systems and methods for physical downlink control channel candidate selection

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- Number: US 12,003,435 B2
- Document ID: US12003435B2
- Status: Granted
- Kind: B2
- Application number: 17/421,584
- Filed: 2020-01-11
- Published: 2022-03-17
- Granted: 2024-06-04
- Earliest claimed: 2019-01-11
- Assignees: Apple Inc.
- Applicants: Apple Inc.
- Inventors: Bishwarup Mondal; Debdeep Chatterjee; Fatemeh Hamidi-Sepehr; Alexei Davydov
- Web page: https://patentgrep.com/patent/US12003435B2

## CPC

- H04L 5/0035: {Resource allocation in a cooperative multipoint environment}
- H04W 72/02: Selection of wireless resources by user or terminal
- H04W 72/044: based on the type of the allocated resource
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 76/15: Setup of multiple wireless link connections
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 5/0073: {Allocation arrangements that take into account other cell interferences}
- 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

Disclosed are systems and methods of selecting physical downlink control channel (PDCCH) candidates for non-coherent joint transmission (NC-JT) in a wireless network. For instance, first and second sets of ControlResourceSet and SearchSpace parameters can be configured for a UE. The first and second sets of ControlResourceSet and SearchSpace parameters are configured on a first downlink (DL) component carrier to enable NC-JT. A control channel element (CCE) limit can be determined for the first and second sets of ControlResourceSet and SearchSpace parameters. One or more PDCCH candidates can then be selected for the first and second sets of ControlResourceSet and SearchSpace parameters based at least in part on the determined CCE limits. NC-JT communication including at least a first communication from a first transmission and reception point (TRP), and a second communication from a second TRP can then be received.

## Claims

### Claim 1

A method of selecting physical downlink control channel (PDCCH) candidates for non-coherent joint transmission (NC-JT) in a wireless network, the method comprising:
configuring a first set of ControlResourceSet and SearchSpace parameters and a second set of ControlResourceSet and SearchSpace parameters for a user equipment (UE), wherein the first and second sets of ControlResourceSet and SearchSpace parameters are configured on a first downlink (DL) component carrier to enable the NC-JT;
determining a first control channel element (CCE) limit for the first set of ControlResourceSet and SearchSpace parameters;
determining a second CCE limit for the second set of ControlResourceSet and SearchSpace parameters;
selecting one or more first PDCCH candidates for the first set of ControlResourceSet and SearchSpace parameters based at least in part on the first CCE limit;
selecting one or more second PDCCH candidates for the second set of ControlResourceSet and SearchSpace parameters based at least in part on the second CCE limit; and
receiving a first portion of an NC-JT communication from a first transmission and reception point (TRP) based on the one or more first PDCCH candidates; and
receiving a second portion of the NC-JT communication from a second TRP based on the one or more second PDCCH candidates.

### Claim 2 (depends on 1)

The method of claim 1, wherein the first set of ControlResourceSet and SearchSpace parameters is associated with the first TRP, and the second set of ControlResourceSet and SearchSpace parameters is associated with the second TRP.

### Claim 3 (depends on 2)

The method of claim 2, wherein configuring the first set of ControlResourceSet and SearchSpace parameters comprises configuring the first set of ControlResourceSet and SearchSpace parameters by a first PDCCH-Config parameter corresponding to the first TRP,
and configuring the second set of ControlResourceSet and SearchSpace parameters comprises configuring the second set of ControlResourceSet and SearchSpace parameters by a second PDCCH-Config parameter corresponding to the second TRP.

### Claim 4 (depends on 3)

The method of claim 3, wherein the first TRP has a different quasi co-location (QCL)
assumption from the second TRP.

### Claim 5 (depends on 1)

The method of claim 1, wherein the first set of ControlResourceSet and SearchSpace parameters is associated with a first serving cell, and the second set of ControlResourceSet and SearchSpace parameters is associated with a second serving cell.

### Claim 6 (depends on 5)

The method of claim 5, wherein configuring the first set of ControlResourceSet and SearchSpace parameters comprises configuring the first set of ControlResourceSet and SearchSpace parameters by a first PDCCH-Config parameter or a first PDCCH-ConfigCommon parameter corresponding to the first serving cell, and configuring the second set of ControlResourceSet and SearchSpace parameters comprises configuring the second set of ControlResourceSet and SearchSpace parameters by a second PDCCH-Config parameter or a second PDCCH-ConfigCommon parameter corresponding to the second serving cell.

### Claim 7 (depends on 1)

The method of claim 1, wherein the first and second sets of ControlResourceSet and SearchSpace parameters are associated with a same bandwidth part (BWP).

### Claim 8 (depends on 1)

The method of claim 1, wherein selecting the one or more first and second PDCCH candidates for the first and second sets of ControlResourceSet and SearchSpace parameters comprises selecting the one or more first and second PDCCH candidates based at least in part on a maximum number of PDCCH candidates per slot for the first and second sets of ControlResourceSet and SearchSpace parameters.

### Claim 9 (depends on 1)

The method of claim 1, wherein determining the first and second CCE limits for the first and second sets of ControlResourceSet and SearchSpace parameters comprises determining a maximum number of non-overlapped CCEs per slot for the first and second sets of ControlResourceSet and SearchSpace parameters.

### Claim 10 (depends on 1)

The method of claim 1, wherein the first and second sets of ControlResourceSet and SearchSpace parameters are associated with a same bandwidth part (BWP).

### Claim 11

A user equipment (UE) comprising:
radio front end circuitry configured to perform wireless communication; and
one or more processors, coupled to the radio front end circuitry, configured to:
configure a first set of ControlResourceSet and SearchSpace parameters and a second set of ControlResourceSet and SearchSpace parameters for the UE, wherein the first and second sets of ControlResourceSet and SearchSpace parameters are configured on a first downlink (DL) component carrier to enable non-coherent joint transmission (NC-JT);
determine a first control channel element (CCE) limit for the first set of ControlResourceSet and SearchSpace parameters;
determine a second CCE limit for the second set of ControlResourceSet and SearchSpace parameters;
select one or more first physical downlink control channel (PDCCH) candidates for the first set of ControlResourceSet and SearchSpace parameters based at least in part on the first CCE limit;
select one or more second PDCCH candidates for the second set of ControlResourceSet and SearchSpace parameters based at least in part on the second CCE limit;
receive, via the radio front end circuitry, a first portion of an NC-JT communication from a first transmission and reception point (TRP) based on the one or more first PDCCH candidates; and
receive, via the radio front end circuitry, a second portion of the NC-JT communication from a second TRP based on the one or more second PDCCH candidates.

### Claim 12 (depends on 11)

The UE of claim 11, wherein the first set of ControlResourceSet and SearchSpace parameters is associated with the first TRP, and the second set of ControlResourceSet and SearchSpace parameters is associated with the second TRP.

### Claim 13 (depends on 12)

The UE of claim 12, wherein configuring the first set of ControlResourceSet and SearchSpace parameters comprises configuring the first set of ControlResourceSet and SearchSpace parameters by a first PDCCH-Config parameter corresponding to the first TRP, and configuring the second set of ControlResourceSet and SearchSpace parameters comprises configuring the second set of ControlResourceSet and SearchSpace parameters by a second PDCCH-Config parameter corresponding to the second TRP.

### Claim 14 (depends on 13)

The UE of claim 13, wherein the first TRP has a different quasi co-location (QCL)
assumption from the second TRP.

### Claim 15 (depends on 11)

The UE of claim 11, wherein the first set of ControlResourceSet and SearchSpace parameters is associated with a first serving cell, and the second set of ControlResourceSet and SearchSpace parameters is associated with a second serving cell.

### Claim 16 (depends on 15)

The UE of claim 15, wherein configuring the first set of ControlResourceSet and SearchSpace parameters comprises configuring the first set of ControlResourceSet and SearchSpace parameters by a first PDCCH-Config parameter or a first PDCCH-ConfigCommon parameter corresponding to the first serving cell, and configuring the second set of ControlResourceSet and SearchSpace parameters comprises configuring the second set of ControlResourceSet and SearchSpace parameters by a second PDCCH-Config parameter or a second PDCCH-ConfigCommon parameter corresponding to the second serving cell.

### Claim 17

A non-transitory computer-readable medium having instructions stored thereon that, when executed by one or more processors, cause the one or more processors to:
configure a first set of ControlResourceSet and SearchSpace parameters and a second set of ControlResourceSet and SearchSpace parameters for a user equipment (UE), wherein the first and second sets of ControlResourceSet and SearchSpace parameters are configured on a first downlink (DL) component carrier to enable non-coherent joint transmission (NC-JT);
determine a first control channel element (CCE) limit for the first set of ControlResourceSet and SearchSpace parameters;
determine a second CCE limit for the second set of ControlResourceSet and SearchSpace parameters;
select one or more first physical downlink control channel (PDCCH) candidates for the first set of ControlResourceSet and SearchSpace parameters based at least in part on the first CCE limit;
select one or more second PDCCH candidates for the second set of ControlResourceSet and SearchSpace parameters based at least in part on the second CCE limit;
receive a first portion of an NC-JT communication from a first transmission and reception point (TRP) based on the one or more first PDCCH candidates; and
receive a second portion of the NC-JT communication from a second TRP based on the one or more second PDCCH candidates.

### Claim 18 (depends on 17)

The non-transitory computer-readable medium of claim 17, wherein the first set of ControlResourceSet and SearchSpace parameters is associated with the first TRP, and the second set of ControlResourceSet and SearchSpace parameters is associated with the second TRP.

### Claim 19 (depends on 17)

The non-transitory computer-readable medium of claim 17, wherein selecting the one or more first and second PDCCH candidates for the first and second sets of ControlResourceSet and SearchSpace parameters comprises selecting the one or more first and second PDCCH candidates based at least in part on a maximum number of PDCCH candidates per slot for the first and second sets of ControlResourceSet and SearchSpace parameters.

### Claim 20 (depends on 17)

The non-transitory computer-readable medium of claim 17, wherein determining the first and second CCE limits for the first and second sets of ControlResourceSet and SearchSpace parameters comprises:
determining a maximum number of non-overlapped CCEs per slot for the first and second sets of ControlResourceSet and SearchSpace parameters.