Spatial quasi co-location indication for control resource set and downlink bandwidth part

Patent metadata

Field	Value
Publication number	US-2020137741-A1
Application number	US-201916663297-A
Country	US
Kind code	A1
Filing date	Oct 24, 2019
Priority date	Oct 26, 2018
Publication date	Apr 30, 2020
Grant date	—

Abstract

Certain aspects of the present disclosure provide techniques that may allow a base station and user equipment (UE) to be in agreement on spatial quasi co-location (QCL) assumptions for transmission in certain scenarios. The techniques may be used, for example, to determine QCL assumptions for downlink transmissions sent in an initial control resource set (CORESET) on an initial downlink bandwidth part (BWP) where dedicated signaling of such assumptions may be lacking. In some cases, the techniques may involve a UE determining a beam to use for monitoring for a physical downlink control channel (PDCCH) transmission on the initial CORESET in the initial downlink BWP that lacks dedicated signaling of QCL information and monitoring for the PDCCH on the initial CORESET in the initial BWP using the determined beam. Other aspects and features are also claimed and described.

First claim

What is claimed is:

1 . A method of wireless communications by a User Equipment (UE), comprising:
determining a beam to use for monitoring for a physical downlink control channel (PDCCH) transmission on a control resource set (CORESET) in a first downlink bandwidth part (BWP), wherein the first DL BWP lacks dedicated signaling of quasi co-location (QCL) information for the UE; and monitoring for the PDCCH on the CORESET in the first BWP using the determined beam.

2 . The method of claim 1 , wherein the CORESET comprises an initial CORESET configured via a master information block (MIB).

3 . The method of claim 1 , wherein the determination is based on dedicated signaling of QCL information for a second downlink BWP.

4 . The method of claim 3 , wherein the second downlink BWP comprises a downlink with a lowest BWP identifier that has dedicated signaling of QCL information.

5 . The method of claim 1 , wherein the determination is based on broadcast signaling of QCL information provided via a PDCCH configuration system information block (SIB).

6 . The method of claim 1 , wherein the determination is based on QCL information provided in a CORESET information element (IE) for the CORESET.

7 . The method of claim 1 , wherein the determination is based on QCL information provided with a reconfiguration of the first downlink BWP as a UE-specific BWP.

8 . The method of claim 1 , wherein the determination is based on QCL information for the CORESET provided via a synchronization signal block (SSB) index in a media access control (MAC) control element (CE).

9 . The method of claim 1 , further comprising basing the determination on information obtained via a previous random access channel (RACH) procedure.

10 . A method of wireless communications by a network entity, comprising:
signaling information regarding a beam for a physical downlink control channel (PDCCH) transmission on a control resource set (CORESET) in a first downlink bandwidth part (BWP) that lacks dedicated signaling of quasi co-location (QCL) information; and transmitting the PDCCH to a user equipment (UE) on the initial CORESET in the initial BWP using the beam.

11 . The method of claim 10 , wherein the CORESET comprises an initial CORESET configured via a master information block (MIB).

12 . The method of claim 10 , wherein the signaling comprises broadcast signaling of QCL information provided via a PDCCH configuration system information block (SIB).

13 . The method of claim 10 , wherein the signaling comprises signaling of QCL information in a CORESET information element (IE) for the CORESET.

14 . The method of claim 10 , wherein the signaling comprises signaling of QCL information for the CORESET via a synchronization signal block (SSB) index in a media access control (MAC) control element (CE).

15 . An apparatus for wireless communications by a User Equipment (UE), comprising:
means for determining a beam to use for monitoring for a physical downlink control channel (PDCCH) transmission on a control resource set (CORESET) in a first downlink bandwidth part (BWP), wherein the first DL BWP lacks dedicated signaling of quasi co-location (QCL) information for the UE; and means for monitoring for the PDCCH on initial CORESET in the first BWP using the determined beam.

16 . The apparatus of claim 15 , wherein the CORESET comprises an initial CORESET configured via a master information block (MIB).

17 . The apparatus of claim 15 , wherein the determination is based on dedicated signaling of QCL information for a second downlink BWP.

18 . The apparatus of claim 17 , wherein the second downlink BWP comprises a downlink with a lowest BWP identifier that has dedicated signaling of QCL information.

19 . The apparatus of claim 15 , wherein the determination is based on broadcast signaling of QCL information provided via a PDCCH configuration system information block (SIB).

20 . The apparatus of claim 15 , wherein the determination is based on QCL information provided in a CORESET information element (IE) for the CORESET.

21 . The apparatus of claim 15 , wherein the determination is based on QCL information provided with a reconfiguration of the first downlink BWP as a UE-specific BWP.

22 . The apparatus of claim 15 , wherein the determination is based on QCL information for the CORESET provided via a synchronization signal block (SSB) index in a media access control (MAC) control element (CE).

23 . The apparatus of claim 15 , further comprising means for basing the determination on information obtained via a previous random access channel (RACH) procedure.

24 . An apparatus for wireless communications by a network entity, comprising:
means for signaling information regarding a beam for a physical downlink control channel (PDCCH) transmission on a control resource set (CORESET) in a first downlink bandwidth part (BWP) that lacks dedicated signaling of quasi co-location (QCL) information; and means for transmitting the PDCCH to a user equipment (UE) on the initial CORESET in the initial BWP using the beam.

25 . The apparatus of claim 24 , wherein the CORESET comprises an initial CORESET configured via a master information block (MIB).

26 . The apparatus of claim 24 , wherein the signaling comprises broadcast signaling of QCL information provided via a PDCCH configuration system information block (SIB).

27 . The apparatus of claim 24 , wherein the signaling comprises signaling of QCL information in a CORESET information element (IE) for the CORESET.

28 . The apparatus of claim 24 , wherein the signaling comprises signaling of QCL information for the CORESET via a synchronization signal block (SSB) index in a media access control (MAC) control element (CE).

Assignees

• Qualcomm Inc

Inventors

• Zhou Yan
• Luo Tao
• Hande Prashanth Haridas
• Chen Wanshi
• Montojo Juan
• Lee Heechoon
• Xu Huilin
• Ly Hung Dinh

Classifications

• H04W56/001 Primary

  Synchronization between nodes · CPC title

• H04L5/001

  the frequencies being arranged in component carriers · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04W72/046 Primary

  the resource being in the space domain, e.g. beams · CPC title

• H04W48/12

  using downlink control channel · CPC title