Co-existence of legacy and low-bandwidth coreset-0

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

identifying a low-bandwidth (low-BW) control resource set (CORESET) and a common search space (CSS) for the low-BW CORESET based on a system configuration information in a master information block (MIB) in accordance with a synchronization signal block (SSB) index received from a base station, wherein the identified low-BW CORESET comprises one or more frequency-time resource grids including at least one of:

one or more overlapping resource grids overlapped with a resource grid of a legacy CORESET and a legacy CSS for the legacy CORESET, or

one or more non-overlapping resource grids separated in time or frequency from the resource grid of the legacy CORESET and the CSS for the legacy CORESET, and

wherein one or more resource grids of the low-BW CORESET comprise one or more resource element groups (REGs) or REG bundles comprised by at least one physical downlink control channel (PDCCH) candidate associated with the legacy CORESET;

and the identified CSS for the low-BW CORESET further identifies at least one of a system frame number (SFN), a slot-index, or a starting-symbol to search for the one or more frequency-time resource grids.

2. The method of claim 1 , wherein the low-BW CORESET and the CSS for the low-BW CORESET comprise at least a group of resource grids that are consecutive in a time domain.

3. The method of claim 1 , wherein the low-BW CORESET and the CSS for the low-BW CORESET comprise at least a group of resource grids comprising a same central frequency.

4. The method of claim 1 , wherein the low-BW CORESET and the CSS for the low-BW CORESET comprise at least a group of resource grids that are non-consecutive in a time domain.

5. The method of claim 1 , wherein the low-BW CORESET and the CSS for the low-BW CORESET comprise at least a group of resource grids comprising different central frequencies.

6. The method of claim 1 , wherein the one or more overlapping resource grids comprise at least one resource grid being consecutive in both a time domain and a frequency domain.

7. The method of claim 1 , wherein the one or more overlapping resource grids comprise at least one of a central frequency resource grid, a starting resource grid, or an ending resource grid which is the same as the resource grid of the legacy CORESET.

8. The method of claim 1 , wherein at least one non-overlapping resource grid comprises at least one resource grid being consecutive in both a time domain and a frequency domain.

9. The method of claim 1 , wherein at least one non-overlapping resource grid comprises a subset of REG bundles of the legacy CORESET, wherein the REG bundles are consecutive within the legacy CORESET.

10. The method of claim 1 , wherein at least one overlapping resource grid and at least one non-overlapping resource grid of the low-BW CORESET comprise all of the REG bundles of the legacy CORESET.

11. The method of claim 1 , wherein at least one non-overlapping resource grid of the low-BW CORESET comprises a subset of REGs or REG bundles of the legacy CORESET, wherein at least one of the REGs or REG bundles are associated with one or more control channel elements (CCEs), wherein the one or more CCEs are associated with the at least one PDCCH candidate.

12. The method of claim 1 , wherein the low-BW CORESET and the CSS of the low-BW CORESET are repeated in a repetition pattern over multiple SSB occasions, wherein the repetition pattern and a starting point of the repetition pattern are associated with a second SFN of the CSS of the low-BW CORESET.

13. The method of claim 12 , wherein the repetition pattern further comprises:

the CSS of the low-BW CORESET associated with a first SSB index comprising a first repeated low-BW CORESET associated with the first SSB index during a first SS burst periodicity, and the CSS of the low-BW CORESET associated with a second SSB index comprising a second repeated low-BW CORESET associated with the second SSB index during a second SS burst periodicity.

14. The method of claim 12 , wherein the repetition pattern further comprises:

the CSS of the low-BW CORESET associated with a first SSB index comprising a repeated low-BW CORESET associated with the first SSB index across multiple SS burst periodicities.

15. The method of claim 1 , wherein a repetition quantity of the low-BW CORESET and the CSS of the low-BW CORESET is determined based at least in part on a minimum repetition quantity requirement in accordance with a link budget of the UE receiving the low-BW CORESET.

16. The method of claim 1 , wherein the system configuration information is determined to be associated with the legacy CORESET and the CSS for the legacy CORESET when a bandwidth of the legacy CORESET is within a reception bandwidth of the UE; and

wherein the system configuration information is determined to be associated with the low-BW CORESET and the CSS for the low-BW CORESET when the bandwidth of the legacy CORESET is greater than the reception bandwidth of the UE.

17. The method of claim 1 , wherein the legacy CORESET comprises a plurality of control channel elements (CCEs) numbered in a first order, and wherein the plurality of CCEs are mapped to the low-BW CORESET in a second order reversed from the first order.

18. The method of claim 1 , wherein the one or more overlapping resource grids comprise a plurality of overlapping resource blocks associated with a group of consecutive indexes, wherein an interval of the group of consecutive indexes is a function of at least one of:

the legacy CORESET;

the CSS of the legacy CORESET;

a second SFN of the CSS of the legacy CORESET;

a slot index within the SFN of the CSS of the legacy CORESET; or

a starting symbol of the slot index within the SFN of the CSS of the legacy CORESET.

19. The method of claim 1 , wherein each resource grid of the low-BW CORESET spans a frequency range lower than a reception bandwidth of the UE.

20. The method of claim 1 , wherein the MIB is received in a SSB; and

the one or more resource grids comprised by the low-BW CORESET and the CSS of the low-BW CORESET are separated from resources used by the SSB comprising the identified MIB.

21. The method of claim 20 , wherein the one or more resource grids comprised by the low-BW CORESET and the CSS of the low-BW CORESET are separated from other resources used by other SSBs that do not comprise the identified MIB.

22. The method of claim 1 , wherein the CSS of the low-BW CORESET for at least one non-overlapping resource grid is within one of a first slot containing the CSS for the legacy CORESET or within at least one slot proximal to the first slot, wherein the system configuration information is received in a first plurality of SSBs for initial access, wherein a second plurality of one or more SSBs are at least associated with radio resource management (RRM); and

wherein the one or more non-overlapping resource grids comprised by the low-BW CORESET and the CSS of the low-BW CORESET are separated from resources used by the second plurality of one or more SSBs.

23. The method of claim 1 , wherein a last orthogonal frequency-division multiplexing (OFDM) symbol of a first resource grid of the low-BW CORESET and the CSS of the low-BW CORESET is separated by one of a first guard time from a first initial OFDM symbol of a second resource grid of the low-BW CORESET and the CSS of the low-BW CORESET, or a second guard time from a second initial OFDM symbol of a SSB; and

wherein the second resource grid comprises a second central frequency being different from a first central frequency of the first resource grid; and

wherein the SSB comprises a third central frequency being different from the first central frequency of the first resource grid.

24. The method of claim 1 , wherein a last OFDM symbol of a SSB is separated by a guard time from a first OFDM symbol of the resource grid of the low-BW CORESET and the CSS of the low-BW CORESET,

wherein the SSB comprises a second central frequency being different from a first central frequency of the resource grid.

25. The method of claim 1 , wherein the system configuration information includes one or more reserved bits, wherein the legacy CORESET and the CSS for the legacy CORESET are not associated with the one or more reserved bits, and the low-BW CORESET and the CSS for the low-BW CORESET are identified from the one or more reserved bits.

26. The method of claim 1 , wherein the identified low-BW CORESET and the CSS for the low-BW CORESET are comprised by the UE for rate-matching, and wherein a resource comprised by the low-BW CORESET and the CSS for the low-BW CORESET is not available for at least one downlink (DL) data channel transmission comprised by the UE.

27. An apparatus for wireless communication, comprising:

memory; and

at least one processor coupled to the memory and configured to:

identify a low-bandwidth (low-BW) control resource set (CORESET) and a common search space (CSS) for the low-BW CORESET based on a system configuration information in a master information block (MIB) in accordance with a synchronization signal block (SSB) index received from a base station, wherein the identified low-BW CORESET comprises one or more frequency-time resource grids including at least one of:

one or more overlapping resource grids overlapped with a resource grid of a legacy CORESET and a legacy CSS for the legacy CORESET, or

one or more non-overlapping resource grids separated in time or frequency from the resource grid of the legacy CORESET and the legacy CSS for the legacy CORESET, and

wherein one or more resource grids of the low-BW CORESET comprise one or more resource element groups (REGs) or REG bundles comprised by at least one physical downlink control channel (PDCCH) candidate associated with the legacy CORESET;

and the identified CSS for the low-BW CORESET further identifies at least one of a system frame number (SFN), a slot-index, or a starting-symbol to search for the one or more frequency-time resource grids.

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

configuring a low-bandwidth (low-BW) control resource set (CORESET) and a common search space (CSS) for the low-BW CORESET based on a system configuration information in a master information block (MIB) in accordance with a synchronization signal block (SSB) index transmitted to a user equipment (UE), wherein the configured low-BW CORESET comprises one or more frequency-time resource grids including at least one of:

one or more overlapping resource grids overlapped with a resource grid of a legacy CORESET and a legacy CSS for the legacy CORESET, or

one or more non-overlapping resource grids separated in time or frequency from the resource grid of the legacy CORESET and the legacy CSS for the legacy CORESET, and

wherein one or more resource grids of the low-BW CORESET comprise one or more resource element groups (REGs) or REG bundles comprised by at least one physical downlink control channel (PDCCH) candidate associated with the legacy CORESET;

and the configured CSS for the low-BW CORESET further identifies at least one of a system frame number (SFN), a slot-index, or a starting-symbol to search for the one or more frequency-time resource grids.

29. The method of claim 28 , wherein the low-BW CORESET and the CSS for the low-BW CORESET comprise at least a group of resource grids:

that are consecutive in a time domain;

comprising a same central frequency;

that are non-consecutive in the time domain; or

comprising different central frequencies.

30. The method of claim 28 , wherein the one or more overlapping resource grids comprise:

at least one resource grid being consecutive in both a time domain and a frequency domain;

at least one of a central frequency resource grid, a starting resource grid, or an ending resource grid which is the same as the resource grid of the legacy CORESET; or

a subset of REG bundles of the legacy CORESET, wherein the REG bundles are consecutive within the legacy CORESET.

31. The method of claim 28 , wherein at least one overlapping resource grid and at least one non-overlapping resource grid of the low-BW CORESET comprise all of the REG bundles of the legacy CORESET.

32. The method of claim 28 , wherein at least one non-overlapping resource grid of the low-BW CORESET comprises a subset of REGs or REG bundles of the legacy CORESET, wherein at least one of the REGs or REG bundles are associated with one or more control channel elements (CCEs), wherein the one or more CCEs are associated with the at least one PDCCH candidate.

33. The method of claim 28 , wherein the low-BW CORESET and the CSS of the low-BW CORESET repeated in a repetition pattern over multiple SSB occasions, wherein the repetition pattern and a starting point of the repetition pattern are associated with a second SFN of the CSS of the low-BW CORESET, wherein the repetition pattern further comprises:

the CSS of the low-BW CORESET associated with a first SSB index comprising a first repeated low-BW CORESET associated with the first SSB index during a first SS burst periodicity, and the CSS of the low-BW CORESET associated with a second SSB index comprising a second repeated low-BW CORESET associated with the second SSB index during a second SS burst periodicity or

the CSS of the low-BW CORESET associated with the first SSB index comprising a repeated low-BW CORESET associated with the first SSB index across multiple SS burst periodicities.

34. The method of claim 28 , wherein a repetition quantity of the low-BW CORESET and the CSS of the low-BW CORESET is configured based at least in part on a minimum repetition quantity requirement in accordance with a link budget of the UE receiving the low-BW CORESET.

35. An apparatus for wireless communication, comprising:

memory; and

at least one processor coupled to the memory and configured to:

configure a low-bandwidth (low-BW) control resource set (CORESET) and a common search space (CSS) for the low-BW CORESET based on a system configuration information in a master information block (MIB) in accordance with a synchronization signal block (SSB) index transmitted to a user equipment (UE), wherein the configured low-BW CORESET comprises one or more frequency-time resource grids including at least one of:

one or more overlapping resource grids overlapped with a resource grid of a legacy CORESET and a legacy CSS for the legacy CORESET, or

one or more non-overlapping resource grids separated in time or frequency from the resource grid of the legacy CORESET and the legacy CSS for the legacy CORESET, and

wherein one or more resource grids of the low-BW CORESET comprise one or more resource element groups (REGs) or REG bundles comprised by at least one physical downlink control channel (PDCCH) candidate associated with the legacy CORESET;

and the configured CSS for the low-BW CORESET further identifies at least one of a system frame number (SFN), a slot-index, or a starting-symbol to search for the one or more frequency-time resource grids.