UE operation with reduced power consumption
Methods, user equipment (UE), and base stations for reception or transmission of physical downlink control channels (PDCCH) associated with a master node (MN) or with a secondary node (SN) are provided. A method of operating a UE to receive PDCCHs includes receiving an indication for a first number of cells N cells,MCG cap and for a second number of cells N cells,SCG cap ; and determining a first total number of PDCCH candidates on N cells,MCG DL,μ cells of the MN over a time period according to N cells,MCG cap and a second total number of PDCCH candidates on N cells,SCG DL,μ cells of the SN over the time period according to N cells,SCG cap . μ is a subcarrier spacing (SCS) configuration for an active bandwidth part (BWP) on each of the N cells,MCG DL,μ cells or N cells,SCG DL,μ cells.
1. A method, comprising:
receiving:
radio resource control (RRC) information for a set of values of a parameter associated with a discontinuous reception (DRX) operation for physical downlink control channels (PDCCHs), and
a PDCCH according to a common search space (CSS), wherein the PDCCH provides a downlink control information (DCI) format;
decoding the DCI format;
determining a first value of the parameter to be one of:
a value, from the set of values for the parameter, indicated by a first field in the DCI format when the DCI format is correctly decoded, and
a predetermined value when the DCI format is not correctly decoded; and
receiving PDCCHs according to the first value of the parameter.
2. The method of claim 1 , wherein the predetermined value is a largest value from the set of values.
3. The method of claim 1 , further comprising:
receiving RRC information indicating the predetermined value.
4. The method of claim 1 , further comprising:
receiving information for a first group of cells and for a second group of cells, wherein the first field is associated with DRX operation on the first group of cells.
5. The method of claim 4 , further comprising:
determining a second value of the parameter to be one of:
a value, from the set of values for the parameter, indicated by a second field in the DCI format when the DCI format is correctly received, and
the predetermined value when the DCI format is not correctly decoded; and
receiving PDCCHs on cells from the second group of according to the second value of the parameter.
6. The method of claim 1 , wherein the parameter is a drx-onDurationTimer that is associated with a time for PDCCH receptions during a DRX cycle.
7. The method of claim 1 , wherein the parameter is a drx-InactivityTimer that is associated with a time for PDCCH receptions after a last PDCCH reception indicating a transmission or reception of a new transport block.
8. The method of claim 1 , wherein the set of values includes pairs of values for:
a drx-onDurationTimer parameter that is associated with a time for PDCCH receptions during a DRX cycle, and
a drx-InactivityTimer parameter that is associated with a time for PDCCH receptions after a last PDCCH reception indicating a transmission or reception of a new transport block.
9. A user equipment (UE), comprising:
a transceiver configured to receive:
radio resource control (RRC) information for a set of values of a parameter associated with a discontinuous reception (DRX) operation for physical downlink control channels (PDCCHs), and
a PDCCH according to a common search space (CSS), wherein the PDCCH provides a downlink control information (DCI) format; and
a processor, operably coupled to the transceiver, the processor configured to:
decode the DCI format, and
determine a first value of the parameter to be one of:
a value, from the set of values for the parameter, indicated by a first field in the DCI format when the DCI format is correctly decoded, and
a predetermined value when the DCI format is not correctly decoded, wherein the transceiver is further configured to receive PDCCHs according to the first value of the parameter.
10. The UE of claim 9 , wherein the predetermined value is a largest value from the set of values.
11. The UE of claim 9 , wherein the transceiver is further configured to receive RRC information indicating the predetermined value.
12. The UE of claim 9 , wherein:
the transceiver is further configured to receive information for a first group of cells and for a second group of cells, and
the first field is associated with DRX operation on the first group of cells.
13. The UE of claim 12 , wherein the processor is further configured to determine a second value of the parameter to be one of:
a value, from the set of values for the parameter, indicated by a second field in the DCI format when the DCI format is correctly decoded, and
the predetermined value when the DCI format is not correctly decoded; and
wherein the transceiver is further configured to receive PDCCHs on cells from the second group of according to the second value of the parameter.
14. The UE of claim 9 , wherein the parameter is a drx-onDurationTimer that is associated with a time for PDCCH receptions during a DRX cycle.
15. The UE of claim 9 , wherein the parameter is a drx-InactivityTimer that is associated with a time for PDCCH receptions after a last PDCCH reception indicating a transmission or reception of a new transport block.
16. The UE of claim 9 , wherein the set of values includes pairs of values for:
a drx-onDurationTimer parameter that is associated with a time for PDCCH receptions during a DRX cycle, and
a drx-InactivityTimer parameter that is associated with a time for PDCCH receptions after a last PDCCH reception indicating a transmission or reception of a new transport block.
17. A base station of a master node (MN), the base station comprising:
a transceiver configured to transmit:
radio resource control (RRC) information for a set of values of a parameter associated with a discontinuous reception (DRX) operation for physical downlink control channels (PDCCHs), and
a PDCCH according to a common search space (CSS), wherein the PDCCH provides a downlink control information (DCI) format; and
a processor, operably coupled to the transceiver, the processor configured to determine a first value of the parameter to be a value, from the set of values for the parameter, indicated by a field in the DCI format, wherein the transceiver is further configured to transmit signaling over a backhaul link to a secondary node (SN) for the first value of the parameter.
18. The base station of claim 17 , wherein the parameter is a drx-onDurationTimer that is associated with a time for PDCCH receptions during a DRX cycle by a user equipment (UE).
19. The base station of claim 17 , wherein the parameter is a drx-InactivityTimer that is associated with a time for PDCCH receptions by a user equipment (UE), after a last PDCCH reception indicating a transmission or reception of a new transport block.
20. The base station of claim 17 , wherein the transceiver is further configured to receive from a user equipment (UE) a buffer status report (BSR) associated with transmissions by the UE to the SN.