PDCCH enhancements for reduced capability new radio devices
Configured uplink and/or downlink grants may be managed by providing configuration parameters through higher layer signaling and then activating and/or deactivating use of provided configurations through group common PDCCH signalling that is transmitted to multiple UEs simultaneously. Similarly, enhancements to group common PDCCH signalling may be used to achieve dynamic scheduling.
1 . A user equipment (UE) comprising:
a processor,
communications circuitry, and
memory storing instructions which, when executed by the processor, cause the UE to:
receive, from a first base station (first gNB) a first communications configuration via radio resource control (RRC) signalling;
receive, from a second gNB, a group common Physical Downlink Control Channel (GC-PDCCH) for a plurality of UEs that includes the UE,
wherein the GC-PDCCH comprises a time domain resource assignment (TDRA) field containing TDRA information and a frequency domain resource alignment (FDRA) field containing FDRA information,
wherein the TDRA and FDRA fields are scrambled with a particular radio-network temporary identifier (RNTI) configured by a higher layer parameter;
based on a PDSCH-TimeDomainAllocationList being provided, apply the PDSCH-TimeDomainAllocationList for the TDRA; and
communicate with the second gNB using the first communication configuration, the TDRA information and the FDRA information.
2 . The UE of claim 1 , wherein the GC-PDCCH further includes a field for indicating Channel State Information (CSI) for the plurality of UEs.
3 . The UB of claim 1 , wherein the particular RNTI differs from each of:
an RNTI for providing dynamic grant,
an activation/deactivation command for a configured grant, and
a cell RNTI (C-RNTD) for providing a UE-specific CSI report.
4 . The UE of claim 1 , wherein the TDRA field is shared with other UEs of the plurality of UEs.
5 . The UE of claim 1 , wherein the FDRA field is shared with other UEs of the plurality of UEs.
6 . The UE of claim 1 , wherein the first communications configuration comprises at least one of:
a first Semi-Persistent Scheduling (SPS) downlink (DL) configuration indicating one or more DL resources that are available to the UE for DL communication with the second gNB, or
a first uplink (UL) Configured Grant (CG) configuration indicating one or more UL resources that are available to the UE for UL communication with the second gNB.
7 . The UE of claim 6 , wherein the instructions further cause the UE to:
receive, from the first gNB, a second communications configuration comprising at least one of a second SPS DL configuration or a second UL CG configuration; and
receive, from the second gNB via downlink control information (DCD) within the GC-PDCCH, a group common activation that indicates whether to activate the first communications configuration or the second communications configuration, and
activate the first communications configuration or the second communications configuration based on the group common activation.
8 . A method performed by a user equipment (UE) comprising:
receiving, from a first base station (first gNB) a first communications configuration via radio resource control (RRC) signalling;
receiving, from a second gNB, a group common Physical Downlink Control Channel (GC-PDCCH) for a plurality of UEs that includes the UE,
wherein the GC-PDCCH comprises a time domain resource assignment (TDRA) field containing TDRA information and a frequency domain resource alignment (FDRA) field containing FDRA information,
wherein the TDRA and FDRA fields are scrambled with a particular radio-network temporary identifier (RNTI) configured by a higher layer parameter;
based on a PDSCH-TimeDomainAllocationList being provided, applying the PDSCH-TimeDomainAllocationList for the TDRA; and
communicating with the second gNB using the first communication configuration, the TDRA information and the FDRA information.
9 . The method of claim 8 , wherein the GC-PDCCH further includes a field for indicating Channel State Information (CSD) for the plurality of UEs.
10 . The method of claim 8 , wherein the particular RNTI differs from each of:
an RNTI for providing dynamic grant,
an activation/deactivation command for a configured grant, and
a cell RNTI (C-RNTI) for providing a UE-specific CSI report.
11 . The method of claim 8 , wherein the TDRA field is shared with other UEs of the plurality of UEs.
12 . The method of claim 8 , wherein the FDRA field is shared with other UEs of the plurality of UEs.
13 . The method of claim 8 , wherein the FDRA field is shared with other UEs of the plurality of UEs.
14 . The method of claim 8 , wherein the first communications configuration comprises at least one of:
a first Semi-Persistent Scheduling (SPS) downlink (DL) configuration indicating one or more DL resources that are available to the UE for DL communication with the second gNB, or
a first uplink (UL) Configured Grant (CG) configuration indicating one or more UL resources that are available to the UE for UL communication with the second gNB.
15 . The method of claim 14 , further comprising:
receiving, from the first gNB, a second communications configuration comprising at least one of a second SPS DL configuration or a second UL CG configuration; and
receiving, from the second gNB via downlink control information (DCI) within the GC-PDCCH, a group common activation that indicates whether to activate the first communications configuration or the second communications configuration, and
activating the first communications configuration or the second communications configuration based on the group common activation.
16 . A non-transitory computer product containing instructions for a method performed by a user equipment (UE), the method comprising:
receiving, from a first base station (first gNB) a first communications configuration via radio resource control (RRC) signalling;
receiving, from a second gNB, a group common Physical Downlink Control Channel (GC-PDCCH) for a plurality of UEs that includes the UE,
wherein the GC-PDCCH comprises a time domain resource assignment (TDRA) field containing TDRA information and a frequency domain resource alignment (FDRA) field containing FDRA information,
wherein the TDRA and FDRA fields are scrambled with a particular radio-network temporary identifier (RNTI) configured by a higher layer parameter;
based on a PDSCH-TimeDomainAllocationList being provided, applying the PDSCH-TimeDomainAllocationList for the TDRA; and
communicating with the second gNB using the first communication configuration, the TDRA information and the FDRA information.