US-12628161-B2 - Linked physical downlink control channel candidate rules

US12628161B2US 12628161 B2US12628161 B2US 12628161B2US-12628161-B2

Abstract

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may monitor for downlink control information (DCI) among a plurality of physical downlink control channel (PDCCH) candidates that are associated with each other, the plurality of PDCCH candidates including at least a first PDCCH candidate in a first transmission time period and a last PDCCH candidate in a second transmission time period. The UE may identify a reference timing rule based at least in part on the association between the plurality of PDCCH candidates, the reference timing rule indicating that a reference time is to be determined based at least in part on either the first transmission time period or the second transmission time period. The UE may determine the reference time based at least in part on the reference timing rule and communicate based at least in part on the reference time.

Inventors

Mostafa Khoshnevisan
Jing Sun
Xiaoxia Zhang
Tao Luo

Assignees

QUALCOMM INCORPORATED

Dates

Publication Date: 20260512
Application Date: 20210922

Claims (20)

1 . A method for wireless communication at a user equipment (UE), comprising: monitoring for first downlink control information among a first plurality of physical downlink control channel candidates that are associated with each other, the first downlink control information scheduling a first shared channel communication for the UE; monitoring for second downlink control information among a second plurality of physical downlink control channel candidates that are associated with each other, the second downlink control information scheduling a second shared channel communication for the UE; determining a first reference time corresponding to the first shared channel communication, wherein the first reference time is a physical downlink control channel ending symbol that is the last symbol of a last physical downlink control channel candidate of the first plurality of physical downlink control channel candidates; determining a second reference time corresponding to the second shared channel communication, wherein the second reference time is a physical downlink control channel ending symbol that is the last symbol of a last physical downlink control channel candidate of the second plurality of physical downlink control channel candidates; and communicating based at least in part on the first reference time and the second reference time according to the first downlink control information and the second downlink control information.
2 . The method of claim 1 , wherein: the first plurality of physical downlink control channel candidates are associated with a first feedback process identifier and the second plurality of physical downlink control channel candidates are associated with a second feedback process identifier.
3 . The method of claim 1 , wherein the first reference time and the second reference time determine an in-order sequence rule for scheduled communications such that: responsive to the first reference time being earlier than the second reference time, the first shared channel communication scheduled by the first downlink control information is communicated before the second shared channel communication scheduled by the second downlink control information is communicated; or responsive to the second reference time being earlier than the first reference time, the second shared channel communication scheduled by the second downlink control information is communicated before the first shared channel communication scheduled by the first downlink control information is communicated.
4 . The method of claim 1 , wherein the first plurality of physical downlink control channel candidates are associated with a first set of transmission time periods and the second plurality of physical downlink control channel candidates are associated with a second set of transmission time periods.
5 . The method of claim 1 , wherein the first shared channel communication and the second shared channel communication comprise uplink communications, downlink communications, or both.
6 . The method of claim 1 , wherein the first plurality of physical downlink control channel candidates are associated with a first set of repetitions of the first downlink control information and the second plurality of physical downlink control channel candidates are associated with a second set of repetitions of the second downlink control information.
7 . A method for wireless communication at a network device, comprising: transmitting, to a user equipment (UE), first downlink control information among a first plurality of physical downlink control channel candidates that are associated with each other, the first downlink control information scheduling a first shared channel communication for the UE; transmitting, to the UE, second downlink control information among a second plurality of physical downlink control channel candidates that are associated with each other, the second downlink control information scheduling a second shared channel communication for the UE; determining a first reference time corresponding to the first shared channel communication, wherein the first reference time is a physical downlink control channel ending symbol that is the last symbol of a last physical downlink control channel candidate of the first plurality of physical downlink control channel candidates; determining a second reference time corresponding to the second shared channel communication, wherein the second reference time is a physical downlink control channel ending symbol that is the last symbol of a last physical downlink control channel candidate of the second plurality of physical downlink control channel candidates; and communicating with the UE based at least in part on the first reference time and the second reference time according to the first downlink control information and the second downlink control information.
8 . The method of claim 7 , wherein the first plurality of physical downlink control channel candidates are associated with a first feedback process identifier and the second plurality of physical downlink control channel candidates are associated with a second feedback process identifier.
9 . The method of claim 7 , wherein the first reference time and the second reference time determine an in-order sequence rule for scheduled communications such that: responsive to the first reference time being earlier than the second reference time, the first shared channel communication scheduled by the first downlink control information is communicated before the second shared channel communication scheduled by the second downlink control information is communicated; or responsive to the second reference time being earlier than the first reference time, the second shared channel communication scheduled by the second downlink control information is communicated before the first shared channel communication scheduled by the first downlink control information is communicated.
10 . The method of claim 7 , wherein the first plurality of physical downlink control channel candidates are associated with a first set of transmission time periods and the second plurality of physical downlink control channel candidates are associated with a second set of transmission time periods.
11 . The method of claim 7 , wherein the first shared channel communication and the second shared channel communication comprise uplink communications, downlink communications, or both.
12 . The method of claim 7 , wherein the first plurality of physical downlink control channel candidates are associated with a first set of repetitions of the first downlink control information and the second plurality of physical downlink control channel candidates are associated with a second set of repetitions of the second downlink control information.
13 . An apparatus for wireless communication at a user equipment (UE), comprising: one or more processors; one or more memories coupled with the one or more processors; and instructions stored in the one or more memories and executable by the one or more processors to: monitor for first downlink control information among a first plurality of physical downlink control channel candidates that are associated with each other, the first downlink control information scheduling a first shared channel communication for the UE; monitor for second downlink control information among a second plurality of physical downlink control channel candidates that are associated with each other, the second downlink control information scheduling a second shared channel communication for the UE; determine a first reference time corresponding to the first shared channel communication, wherein the first reference time is a physical downlink control channel ending symbol that is the last symbol of a last physical downlink control channel candidate of the first plurality of physical downlink control channel candidates; determine a second reference time corresponding to the second shared channel communication, wherein the second reference time is a physical downlink control channel ending symbol that is the last symbol of a last physical downlink control channel candidate of the second plurality of physical downlink control channel candidates; and communicate based at least in part on the first reference time and the second reference time according to the first downlink control information and the second downlink control information.
14 . The apparatus of claim 13 , wherein: the first plurality of physical downlink control channel candidates are associated with a first feedback process identifier and the second plurality of physical downlink control channel candidates are associated with a second feedback process identifier.
15 . The apparatus of claim 13 , wherein the first reference time and the second reference time determine an in-order sequence rule for scheduled communications such that: responsive to the first reference time being earlier than the second reference time, the first shared channel communication scheduled by the first downlink control information is communicated before the second shared channel communication scheduled by the second downlink control information is communicated; or responsive to the second reference time being earlier than the first reference time, the second shared channel communication scheduled by the second downlink control information is communicated before the first shared channel communication scheduled by the first downlink control information is communicated.
16 . The apparatus of claim 13 , wherein the first plurality of physical downlink control channel candidates are associated with a first set of transmission time periods and the second plurality of physical downlink control channel candidates are associated with a second set of transmission time periods.
17 . The apparatus of claim 13 , wherein the first shared channel communication and the second shared channel communication comprise uplink communications, downlink communications, or both.
18 . An apparatus for wireless communication at a network device, comprising: one or more processors; one or more memories coupled with the one or more processors; and instructions stored in the one or more memories and executable by the one or more processors to: transmit, to a user equipment (UE), first downlink control information among a first plurality of physical downlink control channel candidates that are associated with each other, the first downlink control information scheduling a first shared channel communication for the UE; transmit, to the UE, second downlink control information among a second plurality of physical downlink control channel candidates that are associated with each other, the second downlink control information scheduling a second shared channel communication for the UE; determine a first reference time corresponding to the first shared channel communication, wherein the first reference time is a physical downlink control channel ending symbol that is the last symbol of a last physical downlink control channel candidate of the first plurality of physical downlink control channel candidates; determine a second reference time corresponding to the first shared channel communication, wherein the second reference time is a physical downlink control channel ending symbol that is the last symbol of a last physical downlink control channel candidate of the second plurality of physical downlink control channel candidates; and communicate with the UE based at least in part on the first reference time and the second reference time according to the first downlink control information and the second downlink control information.
19 . The apparatus of claim 18 , wherein the first plurality of physical downlink control channel candidates are associated with a first feedback process identifier and the second plurality of physical downlink control channel candidates are associated with a second feedback process identifier.
20 . The apparatus of claim 18 , wherein the first reference time and the second reference time determine an in-order sequence rule for scheduled communications such that: responsive to the first reference time being earlier than the second reference time, the first shared channel communication scheduled by the first downlink control information is communicated before the second shared channel communication scheduled by the second downlink control information is communicated; or responsive to the second reference time being earlier than the first reference time, the second shared channel communication scheduled by the second downlink control information is communicated before the first shared channel communication scheduled by the first downlink control information is communicated.

Description

CROSS REFERENCE The present Application for Patent claims the benefit of U.S. Provisional Patent Application No. 63/082,823 by KHOSHNEVISAN et al., entitled “LINKED PHYSICAL DOWNLINK CONTROL CHANNEL CANDIDATE RULES,” filed Sep. 24, 2020, assigned to the assignee hereof, and expressly incorporated by reference herein. FIELD OF TECHNOLOGY The following relates to wireless communications, including linked physical downlink control channel candidate rules. BACKGROUND Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple-access communications system may include one or more base stations or one or more network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE). SUMMARY The described techniques relate to improved methods, systems, devices, and apparatuses that support linked physical downlink control channel (PDCCH) candidate rules. Generally, the described techniques provide rules that may be applied when linked or otherwise associated PDCCH candidates carry downlink control information (DCI)(s) indicating information for a user equipment (UE). For example, a base station and/or UE may identify a reference timing rule that generally defines that a reference time for a change, transmission, update, etc., indicated in the DCI is determined based on a timing of a first PDCCH candidate or a last PDCCH candidate among the linked PDCCH candidates. The specific reference timing rule may vary based on the specific type of change, transmission, updated, etc., being signaled in the DCI. Examples of scenarios where the reference timing rule may be applied include, but are not limited to, slot format indicator (SFI) index indications, search space (SS) set group switching indications, timing for application of an interrupted transmission indication, timing for application of a cancellation indication, timing for a bandwidth part (BWP) change indications, application of an in-order or out-of-order transmission scheduling, and the like. A method for wireless communication at a UE is described. The method may include monitoring for first DCI among a first set of multiple PDCCH candidates that are associated with each other, the first DCI scheduling a first communication for the UE, monitoring for second DCI among a second set of multiple PDCCH candidates that are associated with each other, the second DCI scheduling a second communication for the UE, determining that the first DCI and the second DCI are received in-sequence based on a reference time defined by a reference timing rule, the reference timing rule being based on at least one of the first set of multiple PDCCH candidates being associated with each other or the second set of multiple PDCCH candidates being associated with each other, and communicating based on the reference time and according to the first DCI and the second DCI. An apparatus for wireless communication at a UE is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to monitor for first DCI among a first set of multiple PDCCH candidates that are associated with each other, the first DCI scheduling a first communication for the UE, monitor for second DCI among a second set of multiple PDCCH candidates that are associated with each other, the second DCI scheduling a second communication for the UE, determine that the first DCI and the second DCI are received in-sequence based on a reference time defined by a reference timing rule, the reference timing rule being based on at least one of the first set of multiple PDCCH candidates being associated with each other or the second set of multiple PDCCH candidates being associated with each other, and communicate based on the reference time and according to the first DCI and the second DCI. Another apparatus for wireless communication at a UE is described. The apparatus may include means for monitoring for first DCI among a first set of multiple PDCCH candidates that are ass