Physical downlink control channel candidates related to physical downlink control channel repetitions

Patent metadata

Field	Value
Publication number	US-2021195559-A1
Application number	US-202017085789-A
Country	US
Kind code	A1
Filing date	Oct 30, 2020
Priority date	Dec 20, 2019
Publication date	Jun 24, 2021
Grant date	—

Abstract

Methods, systems, and devices for wireless communications are described. A communication device, which may be otherwise known as user equipment (UE) may support repetition of physical downlink control channels (PDCCH) and handling a combined PDCCH candidate associated with multiple search space sets. For example, a UE may combine a first PDCCH candidate corresponding to a first search space set and a second PDCCH candidate corresponding to a second search space set to form a combined PDCCH candidate. The UE may decode the combined PDCCH candidate based on one or more factors, for example, such as a blind decoding PDCCH candidate threshold. As a result, the UE may decode the combined PDCCH candidate in addition to decoding of individual PDCCH candidates, thereby providing increased flexibility for downlink control information (DCI) and improving the reliability of PDCCH.

First claim

What is claimed is:

1 . A method for wireless communication at a user equipment (UE), comprising:
combining a first physical downlink control channel candidate corresponding to a first search space set and a second physical downlink control channel candidate corresponding to a second search space set to form a combined physical downlink control channel candidate; assigning an additional physical downlink control channel candidate to a set of physical downlink control channel candidates, wherein the additional physical downlink control channel candidate comprises the combined physical downlink control channel candidate; and monitoring the combined physical downlink control channel candidate based at least in part on the assigning.

2 . The method of claim 1 , further comprising:
determining that the set of physical downlink control channel candidates including the additional physical downlink control channel candidate, the first physical downlink control channel candidate, and the second physical downlink control channel candidate, satisfies a threshold, the threshold comprising a threshold number of physical downlink control channel candidates within a time interval, wherein monitoring the combined physical downlink control channel candidate is based at least in part on the set of physical downlink control channel candidates including the additional physical downlink control channel candidate satisfying the threshold.

3 . The method of claim 1 , further comprising:
determining a first control resource set associated with the first search space set; identifying a first pool index configuration associated with the first control resource set, wherein monitoring the combined physical downlink control channel candidate is based at least in part on the first pool index configuration; and determining a threshold for physical downlink control channel candidates associated with the first pool index configuration.

4 . The method of claim 3 , further comprising:
determining a second control resource set associated with the second search space set; identifying a second pool index configuration associated with the second control resource set, wherein monitoring the combined physical downlink control channel candidate is based at least in part on the second pool index configuration; and determining a threshold for physical downlink control channel candidates associated with the second pool index configuration.

5 . The method of claim 4 , further comprising:
determining that the first pool index configuration is different than the second pool index configuration; and assigning the additional physical downlink control channel candidate to the first pool index configuration, or the second pool index configuration, or both, wherein monitoring the combined physical downlink control channel candidate is based at least in part on that the first pool index configuration is different than the second pool index configuration.

6 . The method of claim 4 , further comprising:
determining that the first pool index configuration and the second pool index configuration have a same pool index configuration; and assigning the additional physical downlink control channel candidate to the first pool index configuration associated with the first control resource set or the second pool index configuration associated with the second control resource set, wherein monitoring the combined physical downlink control channel candidate is based at least in part on that the first pool index configuration and the second pool index configuration have the same pool index configuration.

7 . The method of claim 4 , further comprising:
identifying that the UE is configured with a number of physical downlink control channel candidates in the set of physical downlink control channel candidates including the additional physical downlink control channel candidate; and determining that the number of physical downlink control channel candidates satisfies a threshold number of blind decoding physical downlink control channel candidates for a primary serving cell or a threshold number of control channel elements for the primary serving cell, or both, wherein monitoring the combined physical downlink control channel candidate is based at least in part on the number of physical downlink control channel candidates satisfying the threshold number of blind decoding physical downlink control channel candidates for the primary serving cell or the threshold number of control channel elements for the primary serving cell, or both.

8 . The method of claim 7 , further comprising:
identifying blind decoding physical downlink control channel candidates in the set of physical downlink control channel candidates or control channel elements in the set of physical downlink control channel candidates, or both associated with a common search space set; and excluding the blind decoding physical downlink control channel candidates, or the control channel elements, or both associated with the common search space set from the threshold number of blind decoding physical downlink control channel candidates for the primary serving cell or the threshold number of control channel elements for the primary serving cell, or both.

9 . The method of claim 7 , further comprising:
identifying a UE-specific search space set associated with a lowest search space index; and identifying a number of blind decoding physical downlink control channel candidates or a number of control channel elements, or both associated with the UE-specific search space set, wherein monitoring the combined physical downlink control channel candidate is based at least in part on the number of blind decoding physical downlink control channel candidates or the number of control channel elements, or both associated with the UE-specific search space set.

10 . The method of claim 9 , further comprising:
determining a remainder of physical downlink control channel candidates in the set of physical downlink control channel candidates based at least in part on the excluding; determining a difference between the remainder of physical downlink control channel candidates and the number of blind decoding physical downlink control channel candidates associated with the UE-specific search space set; and allocating the remainder of physical downlink control channel candidates and applying the number of blind decoding physical downlink control channel candidates associated with the UE-specific search space set to the threshold number of blind decoding physical downlink control channel candidates for the primary serving cell.

11 . The method of claim 7 , further comprising:
determining that the first pool index configuration associated with the first control resource set is different than the second pool index configuration associated with the second control resource set; determining that the combined physical downlink control channel candidate is for a UE-specific search space associated with the primary serving cell, wherein the combined physical downlink control channel candidate is allocated to the UE based at least in part on determining that the first pool index configuration is different than the second pool index configuration and that the combined physical downlink control channel candidate is for a UE-specific search space; and applying the combined physical downlink control channel candidate to the threshold number of blind decoding physical downlink control channel candidates for the primary serving cell, the combined physical downlink control channel is counted for overbooking of physical downlink control channel candidates for the primary search cell and satisf

Assignees

• Qualcomm Inc

Inventors

• Khoshnevisan Mostafa
• Zhang Xiaoxia
• Luo Tao
• Chendamarai Kannan Arumugam

Classifications

• H04W72/23 Primary

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/0466

  the resource being a scrambling code · CPC title

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title

• H04W72/02 Primary

  Selection of wireless resources by user or terminal · CPC title

• H04W48/12

  using downlink control channel · CPC title