Downlink control information piggyback in physical downlink shared channel, downlink control information encoding

1. A method of wireless communication at a base station, comprising:

transmitting a first downlink control information (DCI) portion in a physical downlink control channel (PDCCH), wherein the first DCI portion indicates a second DCI portion;

jointly encoding multiple component DCIs with a single cyclic redundancy check (CRC), each of the component DCIs providing a resource allocation in combination with the first DCI portion; and

transmitting the second DCI portion comprising the jointly encoded multiple component DCIs in a physical downlink shared channel (PDSCH).

2. The method of claim 1 , wherein the each of the multiple component DCIs comprised in the second DCI portion allocates resources for at least one of:

a PDSCH transmission,

a physical uplink shared channel (PUSCH),

a physical uplink control channel (PUCCH),

a channel state information reference signal (CSI-RS), or

a sounding reference signal (SRS).

3. The method of claim 1 , wherein the CRC is scrambled with a joint radio network temporary identifier (RNTI).

4. The method of claim 1 , wherein the base station jointly encodes the multiple component DCIs using a single polar code.

5. The method of claim 1 , further comprising:

positioning each of the component DCIs with zero padding based on a longest DCI length monitored by a user equipment (UE).

6. The method of claim 1 , wherein the first DCI portion includes an indication of a number of component DCIs that will be sent in the second DCI portion.

7. The method of claim 6 , further comprising:

padding one or more of the multiple component DCIs based on a DCI length.

8. The method of claim 7 , wherein the DCI length corresponds to a longest DCI length monitored by a user equipment (UE).

9. The method of claim 7 , further comprising:

transmitting an indication of the DCI length to a user equipment (UE).

10. The method of claim 9 , wherein the indication of the DCI length is jointly encoded with a beta offset for a coding rate control.

11. The method of claim 7 , further comprising:

configuring the DCI length for a user equipment (UE) in radio resource control signaling.

12. The method of claim 1 , wherein the second DCI portion includes a header indicating a DCI format and radio network temporary identifier (RNTI) combination for each of the multiple component DCIs.

13. The method of claim 1 , wherein the second DCI portion does not include one or more types of DCI.

14. The method of claim 1 , wherein the base station excludes from the second DCI portion one or more of a fallback DCI or a non-cell radio network temporary identifier (C-RNTI) based DCI.

15. The method of claim 1 , wherein the PDSCH does not include user data.

16. The method of claim 1 , wherein the first DCI portion indicates that the PDSCH does not include user data.

17. A method of wireless communication at a base station, comprising:

transmitting a first downlink control information (DCI) portion in a physical downlink control channel (PDCCH), wherein the first DCI portion indicates a second DCI portion;

jointly encoding multiple component DCIs, each of the component DCIs providing a resource allocation in combination with the first DCI portion, wherein the multiple component DCIs are jointly encoded to form a first codeword;

jointly encoding an additional set of multiple component DCIs to form a second codeword; and

transmitting the second DCI portion comprising the jointly encoded multiple component DCIs in a physical downlink shared channel (PDSCH), wherein the second codeword is transmitted with the first codeword in the second DCI portion in the PDSCH.

18. The method of claim 17 , wherein the first codeword and the second codeword are polar encoded and mapped sequentially.

19. The method of claim 17 , wherein the first DCI portion comprises a field with configuration information for the first codeword and the second codeword.

20. The method of claim 17 , wherein the first DCI portion comprises first configuration information for the first codeword and the second DCI portion comprises second configuration information for the second codeword.

21. A method of wireless communication at a base station, comprising:

transmitting a first downlink control information (DCI) portion in a physical downlink control channel (PDCCH), wherein the first DCI portion indicates a second DCI portion;

jointly encoding multiple component DCIs with a single cyclic redundancy check (CRC), each of the component DCIs providing a resource allocation in combination with the first DCI portion; and

transmitting the second DCI portion comprising the jointly encoded multiple component DCIs in a physical downlink shared channel (PDSCH), wherein the first DCI portion comprises configuration information for a codeword formed based on the jointly encoded multiple component DCIs and the second DCI portion comprises an indication that no additional component DCIs are included in the PDSCH.

22. A method of wireless communication at a user equipment (UE), comprising:

receiving a first downlink control information (DCI) portion in a physical downlink control channel (PDCCH); and

receiving a second DCI portion comprising multiple component DCIs jointly encoded with a single cyclic redundancy check (CRC) in a physical downlink shared channel (PDSCH), each of the component DCIs providing a resource allocation in combination with the first DCI portion.

23. The method of claim 22 , wherein the CRC is scrambled with a joint radio network temporary identifier (RNTI).

24. The method of claim 22 , wherein the multiple component DCIs are jointly encoded with a single polar code.

25. The method of claim 22 , wherein each of the component DCIs is positioned with zero padding based on a longest DCI length monitored by the UE.

26. The method of claim 22 , wherein the first DCI portion in the PDCCH includes an indication of number of component DCIs that will be sent in the second DCI portion.

27. The method of claim 26 , wherein one or more of the multiple component DCIs are padded based on a DCI length.

28. The method of claim 27 , wherein the DCI length is a longest DCI length monitored by the UE.

29. The method of claim 27 , further comprising:

receiving a length indication of the DCI length from a base station.

30. The method of claim 29 , wherein the indication of the DCI length is jointly encoded with a beta offset for a coding rate control.

31. The method of claim 27 , further comprising:

receiving a configuration of the DCI length in radio resource control signaling.

32. The method of claim 22 , wherein the second DCI portion includes a header indicating a DCI format and radio network temporary identifier (RNTI) combination for each of the multiple component DCIs.

33. The method of claim 22 , wherein the PDSCH carrying the second DCI portion does not contain user data.

34. The method of claim 22 , wherein the first DCI portion indicates that the PDSCH carrying the second DCI portion does not contain user data.

35. A method of wireless communication at a user equipment (UE), comprising:

receiving a first downlink control information (DCI) portion in a physical downlink control channel (PDCCH);

receiving a second DCI portion comprising multiple component DCIs in a physical downlink shared channel (PDSCH), each of the component DCIs providing a resource allocation in combination with the first DCI portion, wherein the multiple component DCIs are jointly encoded to form a first codeword; and

receiving a second codeword based on a jointly encoded additional set of multiple component DCIs, wherein the second codeword is received with the first codeword in the second DCI portion in the PDSCH.

36. The method of claim 35 , wherein the first codeword and the second codeword are polar encoded and mapped sequentially.

37. The method of claim 35 , wherein the first DCI portion comprises a field with configuration information for the first codeword and the second codeword.

38. The method of claim 35 , wherein the first DCI portion comprises first configuration information for the first codeword and the second DCI portion comprises second configuration information for the second codeword.

39. A method of wireless communication at a user equipment (UE), comprising:

receiving a first downlink control information (DCI) portion in a physical downlink control channel (PDCCH); and

receiving a second DCI portion comprising jointly encoded multiple component DCIs in a physical downlink shared channel (PDSCH), each of the component DCIs providing a resource allocation in combination with the first DCI portion, wherein the first DCI portion comprises configuration information for a codeword formed based on the jointly encoded multiple component DCIs and the second DCI portion comprises an indication that no additional component DCIs are included in the PDSCH.