Multiple-input, multiple-output (MIMO) enhancements for high speed travel
This disclosure relates to techniques for performing wireless communications by rapidly moving user equipment device in communication with a network. The UE may adapt communication techniques in response to the UE's motion. For example, reference signals may be transmitted by the UE to additional transmission and reception points and/or using different configurations. Similarly, the UE may receive reference signals from additional transmission and reception points.
1. A method, comprising:
transmitting, from a first transmission and reception point (TRP) to a user equipment device (UE), a media access control (MAC) control element (CE) indicating, for a first control resource set (CORESET), a first transmission configuration indication (TCI) state and a second TCI state;
transmitting, from the first TRP to the UE, first control information in a first physical downlink control channel (PDCCH) transmission according to the first TCI state during a first symbol in the first CORESET; and
transmitting, from a second TRP to the UE, second control information in a second PDCCH transmission according to the second TCI state during the first symbol in the first CORESET, wherein the second control information is a copy of the first control information.
2. The method of claim 1 ,
wherein the first control information is configured to be demodulated using a first reference signal (RS) during the first symbol; and
wherein the second control information is configured to be demodulated using a second RS.
3. The method of claim 1 , wherein the first control information comprises a first PDCCH message.
4. The method of claim 3 , wherein the second control information comprises a second PDCCH message.
5. The method of claim 1 , wherein the MAC CE comprises:
a serving cell identifier; and
an identifier of the first CORESET.
6. The method of claim 1 , wherein the MAC CE comprises:
an identifier of the first TCI state; and
an identifier of the second TCI state.
7. A method, comprising:
receiving, from a first transmission and reception point (TRP), a media access control (MAC) control element (CE) indicating, for a first control resource set (CORESET), a first transmission configuration indication (TCI) state and a second TCI state;
receiving, from the first TRP, first control information in a first physical downlink control channel (PDCCH) transmission according to the first TCI state during a first symbol in the first CORESET; and
receiving, from a second TRP, second control information in a second PDCCH transmission according to the second TCI state during the first symbol the first CORESET, wherein the second control information is a copy of the first control information.
8. The method of claim 7 ,
wherein the first control information is configured to be demodulated using a first reference signal (RS) during the first symbol; and
wherein the second control information is configured to be demodulated using a second RS.
9. The method of claim 8 , wherein the first control information comprises a first PDCCH message.
10. The method of claim 9 , wherein the second control information comprises a second PDCCH message.
11. The method of claim 7 , wherein the MAC CE comprises:
a serving cell identifier; and
an identifier of the first CORESET.
12. The method of claim 7 , wherein the MAC CE comprises:
an identifier of the first TCI state; and
an identifier of the second TCI state.
13. A processor configured to:
receive, from a first transmission and reception point (TRP), a media access control (MAC) control element (CE) indicating, for a first control resource set (CORESET), a first transmission configuration indication (TCI) state and a second TCI state;
receive, from the first TRP, first control information in a first physical downlink control channel (PDCCH) transmission using the first TCI state during a first symbol in the first CORESET; and
receive, from a second TRP, second control information in a second PDCCH transmission using the second TCI state during the first symbol in the first CORESET, wherein the second control information is a copy of the first control information.
14. The processor of claim 13 , wherein the processor is further configured to:
wherein the first control information is configured to be demodulated using a first reference signal (RS) during the first symbol; and
wherein the second control information is configured to be demodulated using a second RS.
15. The processor of claim 13 , wherein the first control information comprises a first PDCCH message.
16. The processor of claim 13 , wherein the MAC CE comprises:
an identifier of the first TCI state.
17. The processor of claim 13 , wherein the MAC CE comprises:
an identifier of the second TCI state.
18. The processor of claim 13 , wherein the MAC CE comprises:
a serving cell identifier.
19. The processor of claim 13 , wherein the MAC CE comprises:
an identifier of the first CORESET.