PDCCH monitoring for single-DCI to multi-cell scheduling
Wireless communications systems and methods related to joint-carrier scheduling using a single downlink control information (DCI) signal. The user equipment (UE) receives from a base station (BS) of a first serving cell, a downlink control information (DCI) that indicates a joint-carrier scheduling scheme. Using the joint-carrier scheduling scheme in the DCI, the UE schedules first data for communication on a first shared channel associated with the first serving cell and second data for communication on a second shared channel associated with a second serving cell.
1. A method of wireless communication at a user equipment (UE), comprising:
receiving, via a first serving cell, a downlink control information (DCI) that indicates a joint-carrier scheduling scheme;
identifying a number of DCI format sizes for the joint-carrier scheduling scheme based on a first number of DCI format sizes used for scheduling first data on the first serving cell and a second number of DCI format sizes used for scheduling second data on a second serving cell, wherein the first number of DCI format sizes is different from the second number of DCI format sizes; and
scheduling, using the joint-carrier scheduling scheme in the DCI, the first data for a first communication on a first shared channel associated with the first serving cell and the second data for a second communication on a second shared channel associated with the second serving cell.
2. The method of claim 1 , wherein the first data for communication is associated with a transmission of the first data or a reception of the first data.
3. The method of claim 1 , wherein the second data for communication is associated with a transmission of the second data or a reception of the second data.
4. The method of claim 1 , further comprising:
transmitting the first data using the first shared channel and the second data using the second shared channel.
5. The method of claim 1 , further comprising:
receiving the first data using the first shared channel and the second data using the second shared channel.
6. The method of claim 1 , wherein a carrier indicator field (CIF) in the DCI indicates the joint-carrier scheduling scheme.
7. The method of claim 1 , further comprising:
receiving a radio resource control (RRC) signal indicating a correspondence between a CIF value and the joint-carrier scheduling scheme.
8. The method of claim 1 , further comprising:
receiving, a radio resource control (RRC) signal indicating a number of physical downlink control channel (PDCCH) candidates in a search space that includes the DCI indicating the joint-carrier scheduling scheme.
9. The method of claim 1 , further comprising:
monitoring a number of first PDCCH candidates associated with the DCI indicating the joint-carrier scheduling scheme, wherein the number of first PDCCI candidates is based on a number of second PDCCH candidates associated with a second DCI indicating a same-carrier scheduling scheme or a cross-carrier scheduling scheme.
10. The method of claim 1 , further comprising:
enabling search space sharing using a second DCI indicating a cross-carrier scheduling scheme, wherein the DCI indicating the joint-carrier scheduling scheme is received after the search space is enabled.
11. The method of claim 1 , further comprising:
identifying that a CIF value indicates the joint-carrier scheduling scheme;
monitoring at least one PDCCH candidate in a search space set that carries the DCI for up to a configurable number of DCI format sizes based on the identifying; and
counting a number of the DCI formats sizes based on the at least one monitored PDCCH candidate in the search space set.
12. The method of claim 1 , further comprising:
monitoring at least one PDCCH candidate for the DCI having a DCI format size corresponding to one of preconfigured DCI format sizes.
13. The method of claim 1 , further comprising:
monitoring up to a number of PDCCH candidates on active downlink bandwidth parts (DL BWP) of the first serving cell, wherein the number of PDCCH candidates is based on a number of downlink cells and a number of sets of downlink cells scheduled using the DCI.
14. The method of claim 1 , further comprising:
monitoring up to a number of control channel element (CCE) locations on active downlink bandwidth parts (DL BWP) associated with the first serving cell, wherein the number of CCE locations is based on a number of downlink cells and a number of sets of downlink cells scheduled using the DCI, and wherein CCE locations include at least one PDCCH candidate.
15. The method of claim 1 , further comprising:
a configurable a number of DCIs associated with the first serving cell and the second serving cell, wherein the first serving cell and the second serving cell are included in the joint-carrier scheduling scheme.
16. The method of claim 15 , wherein the configurable number of DCIs is associated with a physical downlink shared channel (PDSCH) transmission.
17. The method of claim 15 , wherein the configurable number of DCIs are associated with a physical uplink shared channel (PUSCH) transmission.
18. A method of wireless communication at a base station (BS) of a first serving cell, comprising:
configuring a joint-carrier scheduling scheme using a downlink control information (DCI), wherein the joint-carrier scheduling scheme is for a first communication of first data on first shared channel associated with the first serving cell and for a second communication of second data on a second shared channel associated with a second serving cell;
configuring a number of DCI format sizes for the joint-carrier scheduling scheme based on a first number of DCI format sizes used for scheduling the first data on the first serving cell and a second number of DCI format sizes used for scheduling the second data on the second serving cell, wherein the first number of DCI format sizes is different from the second number of DCI format sizes; and
transmitting, to a user equipment (UE), the DCI that indicates the joint-carrier scheduling scheme.
19. The method of claim 18 , wherein the first data to be communicated is a transmission of the first data or a reception of the first data.
20. The method of claim 18 , wherein the second data to be communicated is a transmission of the second data or a reception of the second data.
21. The method of claim 18 , wherein a carrier indicator field (CIF) in the DCI indicates the joint-carrier scheduling scheme.
22. The method of claim 18 , further comprising:
configuring, at the BS, a radio resource control (RRC) signal indicating a correspondence between a CIF value and the joint-carrier scheduling scheme.
23. The method of claim 18 , further comprising:
configuring, at the BS, a RRC signal indicating a number of physical downlink control channel (PDCCH) candidates in a search space set that includes the DCI indicating the joint-carrier scheduling scheme.
24. The method of claim 18 , further comprising:
configuring a number of first PDCCH candidates associated with the DCI indicating the joint-carrier scheduling scheme based on a number of second PDCCH candidates associated with a second DCI indicating a same-carrier scheduling scheme or a cross-carrier scheduling scheme.
25. The method of claim 18 , further comprising:
transmitting an RRC signal to the UE that enables search space sharing for a cross-carrier scheduling scheme or a same-carrier scheduling scheme; and
configuring the DCI indicating the joint-carrier scheduling scheme when the RRC signal enables the search space sharing.
26. The method of claim 18 , further comprising:
transmitting a PDCCH that includes the DCI in at least one of the DCI format sizes.
27. The method of claim 18 , wherein a DCI format size of the DCI is one of preconfigured DCI format sizes.
28. The method of claim 18 , further comprising:
transmitting up to a number of PDCCH candidates on active downlink bandwidth parts (DL BWP) of the first serving cell, wherein the number of PDCCH candidates is based on a number of downlink cells and a number of sets of downlink cells scheduled using the DCI.
29. The method of claim 18 , further comprising:
transmitting up to a number of control channel element locations on active downlink bandwidth parts (DL BWP) of the first serving cell, wherein the number of CCE is based on a number of downlink cells and a number of sets of downlink cells scheduled using the DCI, and wherein CCE locations include at least one PDCCH candidate.
30. The method of claim 18 , further comprising:
transmitting, at the BS, a configurable number of DCIs associated with the first serving cell and the second serving cell included in the joint-carrier scheduling scheme.
31. The method of claim 30 , wherein the configurable number of DCIs are associated with a physical downlink shared channel (PDSCH) transmission.
32. The method of claim 30 , wherein the configurable number of DCIs are associated with a physical uplink shared channel (PUSCH) transmission.
33. A user equipment (UE) comprising:
at least one transceiver;
memory comprising instructions; and
one or more processors configured execute the instructions to cause the UE to:
receive, via the at least one transceiver, from a first serving cell, a downlink control information (DCI) that indicates a joint-carrier scheduling scheme;
identify a number of DCI format sizes for the joint-carrier scheduling scheme based on a first number of DCI format sizes used for scheduling first data on the first serving cell and a second number of DCI format sizes used for scheduling second data on a second serving cell, wherein the first number of DCI format sizes is different from the second number of DCI format sizes; and
schedule, using the joint-carrier scheduling scheme in the DCI, the first data for a first communication on a first shared channel associated with the first serving cell and the second data for a second communication on a second shared channel associated with the second serving cell.
34. The UE of claim 33 , wherein the first data for communication is associated with a transmission of the first data or a reception of the first data.
35. The UE of claim 33 , wherein a carrier indicator field (CIF) in the DCI indicates the joint-carrier scheduling scheme.