Granted Patent B2

US 12,507,241 · App. 17/608,558 · Granted Dec 23, 2025

Inventors: Shiwei Gao (Nepean, CA); Siva Muruganathan (Stittsville, CA); Sebastian Faxér (Stockholm, SE)

Assignee: Telefonaktiebolaget LM Ericsson (publ)

H04W72/23H04L5/0048

Abstract

Claims (80)

1 . A method performed by a wireless device in a wireless network for determining a Physical Downlink Shared Channel, PDSCH, transmission scheme from a plurality of PDSCH transmission schemes, the method comprising:

receiving Downlink Control Information, DCI, comprising a Transmission Configuration Indicator, TCI, field, a redundancy version, RV, field and an antenna port field;

determining a PDSCH transmission scheme for a plurality of PDSCH transmissions based on the TCI field and the antenna port field in the DCI;

determining an RV for each of the plurality of PDSCH transmissions based on the RV field according to the determined PDSCH transmission scheme;

configuring the wireless device to receive the plurality of PDSCH transmissions according to the determined PDSCH transmission scheme; and

receiving, from a network node, a list of configured TCI states, and a plurality of antenna port tables, wherein a Demodulation Reference Signal, DM-RS, port table, is determined from the plurality of antenna port tables, based on a number of TCI states indicated in the DCI, a configured DM-RS type, or a maximum number of front-load symbols for the plurality of PDSCH transmissions;

wherein the antenna port field in the DCI indicates one or more DM-RS ports in one or more Code Division Multiplexing, CDM, groups for the plurality of PDSCH transmissions according to the selected DM-RS port table; and

the method further comprises:

applying the plurality of TCI states, the plurality of RVs, and the one or more DM-RS ports.

2 . The method of claim 1 , wherein the DCI is received over a Physical Downlink Control Channel, PDCCH, with DCI format 1-1.

3 . The method of claim 1 , wherein:

the method further comprises determining an RV for each of the plurality of PDSCH transmissions based on the RV field in the DCI according to the determined transmission PDSCH scheme.

4 . The method of claim 3 , wherein:

the TCI field indicates a plurality of TCI states out of the list of configured TCI states; and

the RV field indicates a plurality of RVs from a set of pre-specific RV values.

5 . The method of claim 3 , wherein the transmission PDSCH scheme is a mini-slot-based Time Division Multiplexing, TDM, PDSCH repetition scheme in which a PDSCH is repeated in multiple non-overlapping mini-slots within a time slot with each repetition associated to a different RV and a different TCI state.

6 . The method of claim 5 , wherein:

the different TCI states associated to the PDSCH transmissions are indicated by the TCI field in the DCI;

a first indicated TCI state is associated to a first PDSCH transmission of the plurality of PDSCH transmissions; and

a second indicated TCI state is associated to a second PDSCH transmission of the plurality of PDSCH transmissions.

7 . The method of claim 6 , wherein the first PDSCH transmission is received prior to the second PDSCH transmission.

8 . The method of claim 3 , wherein the transmission PDSCH scheme is a Frequency Division Multiplexing, FDM, multi-RV PDSCH repetition scheme in which a PDSCH is repeated in multiple non-overlapping frequency resources in a same time slot with each repetition associated to a different RV and a different TCI state.

9 . The method of claim 8 , wherein:

the different TCI states associated to the PDSCH transmissions are indicated by the TCI field in the DCI;

a first indicated TCI state is associated to a first PDSCH transmission of the plurality of PDSCH transmissions; and

a second indicated TCI state is associated to a second PDSCH transmission of the plurality of PDSCH transmissions.

10 . The method of claim 9 , wherein the first PDSCH transmission is received on a first frequency domain resource with a starting Resource Block, RB, having a smaller index value than a starting RB of a second frequency domain resource allocated for the second PDSCH transmission.

11 . The method of claim 3 , wherein determining the RV for each of the plurality of PDSCH transmissions based on the RV field in the DCI comprises determining different RVs according to the following table:

RV field

RVs for the first and second PDSCH transmissions

value in

1 st PDSCH transmission

2 nd PDSCH transmission

DCI

associated with 1st TCI state

associated with 2nd TCI state

0

0

2

1

2

3

2

3

1

3

1

 0.

12 . The method of claim 1 , wherein the PDSCH transmission scheme comprises one or more of:

a Spatial Division Multiplexing, SDM, scheme;

a first Frequency Division Multiplexing, FDM, scheme with a single Redundancy Version, RV;

a second FDM scheme with multiple RVs;

a mini-slot-based Time Division Multiplexing, TDM, scheme; or

a slot-based TDM scheme.

13 . The method of claim 1 , wherein the PDSCH transmission scheme comprises one or more of:

a combination of Spatial Division Multiplexing, SDM, and single-Redundancy Version, RV, based Frequency Division Multiplexing, FDM;

a combination of single-RV-based FDM and slot-based Time Division Multiplexing, TDM;

a combination of single-RV-based FDM and mini-slot-based TDM;

a combination of SDM and slot-based TDM; or

a combination of SDM and mini-slot-based TDM.

14 . The method of claim 1 , further comprising receiving an assignment of two or more allocation tables for determining the PDSCH transmission scheme from the antenna port field in the DCI.

15 . A method performed by a base station for signaling a Physical Downlink Shared Channel, PDSCH, transmission scheme in a wireless network comprising a User Equipment, UE, and a plurality of Transmission/Reception Points, TRPs, wherein each TRP is associated with a Transmission Configuration Indication, TCI, state, the method comprising:

signaling a Downlink Control Information, DCI, comprising a TCI field, a redundancy version, RV, field and an antenna port field; and

signaling, to the UE, a PDSCH transmission scheme for a plurality of PDSCH transmissions via an antenna port field in the DCI; and

signaling, to the UE, a list of configured TCI states, and a plurality of antenna port tables, wherein a Demodulation Reference Signal, DM-RS, port table, is determined from the plurality of antenna port tables, based on a number of TCI states indicated in the DCI, a configured DM-RS type, or a maximum number of front-load symbols for the plurality of PDSCH transmissions;

wherein the antenna port field in the DCI indicates one or more DM-RS ports in one or more Code Division Multiplexing, CDM, groups for the plurality of PDSCH transmissions according to the selected DM-RS port table; and

the method further comprises:

applying the plurality of TCI states, the plurality of RVs, and the one or more DM-RS ports.

16 . A wireless device, comprising:

one or more transmitters;

one or more receivers; and

processing circuitry associated with the one or more transmitters and the one or more receivers, the processing circuitry configured to cause the wireless device to:

receive Downlink Control Information, DCI, comprising a Transmission Configuration Indicator, TCI, field, a redundancy version, RV, field, and an antenna port field;

determine a PDSCH transmission scheme for a plurality of PDSCH transmissions based on the TCI field and the antenna port field in the DCI;

determine an RV for each of the plurality of PDSCH transmissions based on the RV field according to the determined PDSCH transmission scheme; and

configure the wireless device to receive the plurality of PDSCH transmissions according to the determined PDSCH transmission scheme; and

receive, from a network node, a list of configured TCI states, and a plurality of antenna port tables, wherein a Demodulation Reference Signal, DM-RS, port table, is determined from the plurality of antenna port tables, based on a number of TCI states indicated in the DCI, a configured DM-RS type, or a maximum number of front-load symbols for the plurality of PDSCH transmissions;

wherein the antenna port field in the DCI indicates one or more DM-RS ports in one or more Code Division Multiplexing, CDM, groups for the plurality of PDSCH transmissions according to the selected DM-RS port table; and

the processing circuitry is further configured to cause the wireless device to:

apply the plurality of TCI states, the plurality of RVs, and the one or more DM-RS ports.

Assignments (1)

Continuity (2)

References Cited (88)