Techniques for handling overlapping sets of downlink control channel resources

Patent metadata

Field	Value
Publication number	US-10574388-B2
Application number	US-201815943533-A
Country	US
Kind code	B2
Filing date	Apr 2, 2018
Priority date	Apr 3, 2017
Publication date	Feb 25, 2020
Grant date	Feb 25, 2020

Abstract

Techniques for monitoring for control information in sets of downlink control channel resources are described, where multiple sets of downlink control channel resources may overlap. The described techniques include monitoring for one or more search spaces in a set of downlink control channel resources by rate matching downlink control channel resources independently of other sets of downlink control channel resources. Alternatively, overlapping sets of downlink control channel resources may be rate-matched accounting for reference signals of overlapping sets of downlink control channel resources.

First claim

What is claimed is:

1. A method for wireless communication at a user equipment (UE), comprising:
identifying a first control resource set and a second control resource set, wherein resources of the first control resource set at least partially overlap with resources of the second control resource set;
identifying first locations for a first set of reference signals associated with the first control resource set;
monitoring a first search space of the first control resource set, wherein the monitoring the first search space comprises rate-matching first downlink control channel resources of the first control resource set for the first search space independently of the second control resource set and rate matching the first downlink control channel resources around the first locations;
monitoring a second search space of the second control resource set, wherein the monitoring the second search space comprises rate-matching second downlink control channel resources of the second control resource set for the second search space independently of the first control resource set; and
communicating with a base station based at least in part on control information identified as a result of the monitoring of the first search space or the monitoring of the second search space.

2. The method of claim 1 , further comprising:
identifying second locations for a second set of reference signals associated with the second control resource set, wherein the monitoring the second search space comprises rate matching the second downlink control channel resources around the second locations.

3. The method of claim 2 , wherein the first locations coincide with the second locations within the resources of the first control resource set that overlap with the resources of the second control resource set.

4. The method of claim 2 , wherein the first locations are non-coincident with the second locations within the resources of the first control resource set that overlap with the resources of the second control resource set.

5. The method of claim 4 , wherein the monitoring the first search space comprises:
rate matching the first downlink control channel resources to the second locations within the resources of the first control resource set that overlap with the resources of the second control resource set.

6. The method of claim 5 , wherein the rate matching the first downlink control channel resources to the second locations is based at least in part on a type of the first control resource set and a type of the second control resource set.

7. The method of claim 1 , wherein the monitoring the first search space comprises:
demodulating one or more downlink control channel candidates of the first search space within the resources of the first control resource set that overlap with the resources of the second control resource set based at least in part on the first set of reference signals.

8. The method of claim 1 , further comprising:
determining that at least one reference signal associated with the first control resource set is in a portion of resources that overlap with the second control resource set based at least in part on a type of the first control resource set and a type of the second control resource set.

9. A method for wireless communication at a user equipment (UE), comprising:
identifying a first control resource set configured for downlink control information for the UE, the first control resource set having first locations for a first set of reference signals;
identifying a second control resource set, wherein resources of the first control resource set at least partially overlap with resources of the second control resource set, and wherein second locations for a second set of reference signals of the second control resource set are non-coincident with the first locations within the resources of the first control resource set that overlap with the resources of the second control resource set;
monitoring a first search space of the first control resource set, wherein the monitoring the first search space comprises rate matching first downlink control channel resources of the first control resource set around the first locations and the second locations within the resources of the first control resource set that overlap with the resources of the second control resource set;
demodulating one or more downlink control channel candidates of the first search space within the resources of the first control resource set that overlap with the resources of the second control resource set based at least in part on the first set of reference signals; and
communicating with a base station based at least in part on control information identified as a result of the monitoring the first search space and the demodulating.

10. The method of claim 9 , further comprising:
determining that at least one reference signal associated with the first control resource set is in a portion of resources that overlap with the second control resource set based at least in part on a type of the first control resource set and a type of the second control resource set.

11. The method of claim 10 , wherein the monitoring the first search space comprises:
spatially processing the resources of the first control resource set that overlap with the resources of the second control resource set based at least in part on the first set of reference signals.

12. The method of claim 9 , further comprising:
identifying at least one physical channel transmitted on at least a portion of the first control resource set, wherein a downlink control channel is rate matched around the at least one physical channel.

13. An apparatus for wireless communication, comprising:
a processor;
memory in communication with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
identify a first control resource set and a second control resource set, wherein resources of the first control resource set at least partially overlap with resources of the second control resource set;
identify first locations for a first set of reference signals associated with the first control resource set;
monitor a first search space of the first control resource set, wherein the monitoring the first search space comprises rate-matching first downlink control channel resources of the first control resource set for the first search space independently of the second control resource set and rate matching the first downlink control channel resources around the first locations;
monitor a second search space of the second control resource set, wherein the monitoring the second search space comprises rate-matching second downlink control channel resources of the second control resource set for the second search space independently of the first control resource set; and
communicate with a base station based at least in part on control information identified as a result of the monitoring of the first search space or the monitoring of the second search space.

14. The apparatus of claim 13 , wherein the instructions are further executable by the processor to cause the apparatus to:
identify second locations for a second set of reference signals associated with the second control resource set, wherein the monitoring the second search space comprises rate matching the second downlink control channel resources around the second locations.

15. The apparatus of claim 14 , wherein the first locations coincide with the second locations within the resources of the first control resource set that overlap with the resources of the second control re

Assignees

• Qualcomm Inc

Inventors

• Lee Heechoon
• Gaal Peter
• Sun Jing
• Chen Wanshi

Classifications

• H04L5/0007

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title

• H04L1/0067

  Rate matching (H04L1/0013 and H04L1/08 take precedence) · CPC title

• H04W72/0446

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

• H04L5/0048 Primary

  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

• H04L5/0023

  Time-frequency-space · CPC title