IP Library › Granted Patent US 11,736,253
Granted Patent B2
US 11,736,253 · App. 17/689,229 · Granted Aug 22, 2023

Collision handling of reference signals

Inventors: Debdeep Chatterjee (Mountain View, CA); Alexei Vladimirovich Davydov (Nizhny Novgorod, RU); Seung Hee Han (San Jose, CA); Jeongho Jeon (San Jose, CA); Sameer Pawar (Santa Clara, CA); Avik Sengupta (San Jose, CA); Guotong Wang (Beijing, CN); Yushu Zhang (Beijing, CN)
Assignee: Apple Inc.
H04L5/0048H04L1/1812H04L5/0044H04L5/0051H04L5/0053H04L5/0094
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Quick Facts
Patent No.
US 11,736,253
App. No.
17/689,229
Granted
Aug 22, 2023
Kind
B2
Abstract

A user equipment (UE) can include processing circuitry configured to decode control information of a physical down-link control channel (PDCCH) received via a resource within a control resource set (CORESET) occupying a subset of a plurality of OFDM symbols within a slot. At least one of the symbols in the subset coincides with a pre-defined symbol location associated with a demodulation reference signal (DM-RS) of a PDSCH. The DM-RS can be detected within the slot, the DM-RS starting at a symbol location that is shifted from the pre-defined symbol location and following the subset of symbols. Downlink data scheduled by the PDCCH and received via the PDSCH can be decoded, where the decoding is based on the detected DM-RS.

Claims (29)

1. A method, comprising:

receiving a configuration with first resources for physical downlink control channel (PDCCH) monitoring and configuration of an associated control resource set (CORESET), wherein the first resources occupy a subset of a plurality of OFDM symbols within a slot;

receiving a message scheduling a physical downlink shared channel (PDSCH) demodulation reference signal (DM-RS) in the slot, wherein a first front-loaded DMRS symbol of the PDSCH DM-RS collides with the first resources; and

receiving the first front-loaded DMRS symbol of the PDSCH DM-RS starting at a shifted symbol location based on the collision, wherein the shifted symbol location is immediately after the associated CORESET.

2. The method of claim 1 , wherein when an additional DM-RS is associated with the PDSCH: (1) the additional DM-RS is shifted to a second symbol location or (2) a UE assumes the additional DM-RS is not transmitted.

3. The method of claim 1 , wherein a PDSCH transmission uses mapping type B.

4. The method of claim 1 , wherein the DM-RS is a full DM-RS.

5. Method of claim 4 , wherein the full DM-RS occupies a same number of physical resource blocks (PRBs) as the CORESET.

6. The method of claim 1 , wherein the DM-RS occupies one of a single symbol or two symbols within the slot.

7. The method of claim 1 , wherein the DM-RS is shifted by zero or more OFDM symbols.

8. A method, comprising:

transmitting, to a user equipment (UE), configuration of first resources for physical downlink control channel (PDCCH) monitoring and associated control resource set (CORESET) configuration, wherein the first resources occupy a subset of a plurality of OFDM symbols within a slot;

scheduling a physical downlink shared channel (PDSCH) demodulation reference signal (DM-RS) in the slot, wherein a first front-loaded DMRS symbol of the PDSCH DM-RS collides with the first resources; and

transmitting the first front-loaded DMRS symbol of the PDSCH DM-RS starting at a shifted symbol location based on the collision, wherein the shifted symbol location is immediately after the associated CORESET.

9. The method of claim 8 , wherein when an additional DM-RS is associated with the PDSCH: (1) the additional DM-RS is shifted to a second symbol location or (2) the UE assumes the additional DM-RS is not transmitted.

10. The method of claim 8 , wherein a PDSCH transmission uses mapping type B.

11. The method of claim 8 , wherein the DM-RS is a full DM-RS.

12. The method of claim 11 , wherein the full DM-RS occupies a same number of physical resource blocks (PRBs) as the CORESET.

13. The method of claim 8 , wherein the DM-RS occupies one of a single symbol or two symbols within the slot.

14. The method of claim 8 , wherein the DM-RS is shifted by zero or more OFDM symbols.

15. A method, comprising:

transmitting, to a user equipment (UE), configuration of first resources for physical downlink control channel (PDCCH) monitoring and configuration of an associated control resource set (CORESET), wherein the first resources occupy a subset of a plurality of OFDM symbols within a slot;

scheduling a physical downlink shared channel (PDSCH) demodulation reference signal (DM-RS) in the slot; and

when a first front-loaded DMRS symbol of the PDSCH DM-RS collides with the configuration the first resources, transmitting the first front-loaded DMRS symbol of the PDSCH DM-RS immediately after the associated CORESET.

16. The method of claim 15 , wherein when an additional DM-RS is associated with the PDSCH: (1) the additional DM-RS is shifted to a second symbol location or (2) the UE assumes the additional DM-RS is not transmitted.

17. The method of claim 15 , wherein a PDSCH transmission uses mapping type B.

18. The method of claim 15 , wherein the DM-RS is a full DM-RS.

19. The method of claim 15 , wherein the DM-RS occupies one of a single symbol or two symbols within the slot.

20. The method of claim 15 , wherein the DM-RS is shifted by zero or more OFDM symbols.