Transmission and reception of physical downlink control channels
A wireless transmit/receive unit (WTRU) may receive a PDCCH transmission comprising a CCE that is mapped to one or more REGs based on a CCE-to-REG mapping. The WTRU may receive the CCE-to-REG mapping that indicates a REG bundle corresponding to the CCE and use the CCE-to-REG mapping to identify the REGs for the WTRU. Depending on whether the CCE-to-REG mapping is interleaving or noninterleaving, the CCE-to-REG mapping may be based on different parameters. If the CCE-to-REG mapping is interleaving, the CCE-to-REG mapping may be based on an index associated with the CCE and a number of REGs in the REG bundle. If the CCE-to-REG mapping is noninterleaving, the CCE-to-REG mapping may be based on the index of the CCE.
1. A device comprising:
a processor; and
a memory configured to communicate with the processor and store instructions that, when executed by the processor, cause the device to:
receive control resource set (CORESET) configuration information;
determine a control channel element (CCE)-to-resource element group (REG) mapping for a CORESET based on the CORESET configuration information, wherein the CCE-to-REG mapping indicates a REG bundle associated with the CCE, wherein:
the REG bundle includes a plurality of REGs, wherein a mapping of the plurality of REGs to the REG bundle is determined based on a number of REGs included in the REG bundle and a number of REGs in the CORESET; and
the CCE-to-REG mapping is determined as a function of an index associated with the CCE and the number of the REGs included in the REG bundle; and
decode a physical downlink control channel (PDCCH) transmission associated with the CORESET based on the determined CCE-to-REG mapping.
2. The device of claim 1 , wherein a plurality of REGs in the CORESET are numbered in an increasing order in a time-first manner.
3. The device of claim 1 , wherein a plurality of REGs in the CORESET are numbered in an increasing order in frequency.
4. The device of claim 1 , wherein the processor is further configured to determine whether the CCE-to-REG mapping is interleaved or non-interleaved based on the CORESET configuration information.
5. The device of claim 4 , wherein on a condition that the CORESET configuration information indicates that the CCE-to-REG mapping is interleaved, the CCE-to-REG mapping is determined based on a modulo operation that uses a modulo base, wherein the modulo base is the number of REG bundles in the CORESET.
6. The device of claim 5 , wherein the modulo operation has a multiplying factor that is a function of the number of REG bundles in the CORESET.
7. The device of claim 4 , wherein the processor is further configured by radio resource control signaling to determine whether the CCE-to-REG mapping is interleaved or non-interleaved.
8. The device of claim 1 , wherein the CORESET comprises a plurality of REGs that are numbered in an increasing order in frequency when the CORESET covers one orthogonal frequency-division multiplex (OFDM) symbol.
9. The device of claim 1 , wherein the CORESET comprises a plurality of REGs in the CORESET that are numbered based on a number of orthogonal frequency-division multiplex (OFDM) symbols in the CORESET.
10. A method comprising:
receiving control resource set (CORESET) configuration information;
determining a control channel element (CCE)-to-resource element group (REG) mapping for a CORESET based on the CORESET configuration information, wherein the CCE-to-REG mapping indicates a REG bundle associated with the CCE wherein:
the REG bundle includes a plurality of REGs, wherein a mapping of the plurality of REGs to the REG bundle is determined based on a number of REGs included in the REG bundle and a number of REGs in the CORESET; and
the CCE-to-REG mapping is determined as a function of an index associated with the CCE and the number of the REGs included in the REG bundle; and
decoding a physical downlink control channel (PDCCH) transmission associated with the CORESET based on the determined CCE-to-REG mapping.
11. The method of claim 10 , wherein a plurality of REGs in the CORESET are numbered in an increasing order in a time-first manner.
12. The method of claim 10 , wherein a plurality of REGs in the CORESET are numbered in an increasing order in frequency.
13. The method of claim 10 , further comprising determining whether the CCE-to-REG mapping is interleaved or non-interleaved based on the CORESET configuration information.
14. The method of claim 13 , wherein on a condition that the CORESET configuration information indicates that the CCE-to-REG mapping is interleaved, the CCE-to-REG mapping is determined based on a modulo operation that uses a modulo base, wherein the modulo base is the number of REG bundles in the CORESET.
15. The method of claim 14 , wherein the modulo operation has a multiplying factor that is a function of the number of REG bundles in the CORESET.
16. The method of claim 13 , further comprising configuring by radio resource control signaling to determine whether the CCE-to-REG mapping is interleaved or non-interleaved.
17. The method of claim 10 , wherein the CORESET comprises a plurality of REGs that are numbered in an increasing order in frequency when the CORESET covers one orthogonal frequency-division multiplex (OFDM) symbol.
18. The method of claim 10 , wherein the CORESET comprises a plurality of REGs in the CORESET that are numbered based on a number of orthogonal frequency-division multiplex (OFDM) symbols in the CORESET.
19. A non-transitory computer readable medium having stored instructions which, when executed by a processor, cause the processor to perform the method of claim 10 .
20. A non-transitory computer readable medium having stored instructions which, when executed by a processor, cause the processor to perform the method of claim 14 .