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 for a user equipment (UE) to receive physical downlink control channels (PDCCHs) from a master node (MN) or from a secondary node (SN), the method comprising:
receiving an indication for a first number of cells N cells,MCG cap and for a second number of cells N cells,SCG cap , wherein MCG denotes a master cell group for the MN and SCG denotes a secondary cell group for the SN;
determining a first total number of PDCCH candidates M PDCCH,MCG total,μ for N cells,MCG DL,μ downlink (DL) cells of the MN over a time period according to N cells,MCG cap , wherein μ is a subcarrier spacing (SCS) configuration for an active bandwidth part (BWP) for each of the N cells,MCG DL,μ DL cells; and
determining a second total number of PDCCH candidates M PDCCH,SCG total,μ for N cells,SCG DL,μ DL cells of the SN over the time period according to N cells,SCG cap , wherein μ is a SCS configuration for the active BWP for each of the N cells,SCG DL,μ DL cells.
2. The method of claim 1 , wherein the time period is one slot for SCS configuration μ.
3. The method of claim 2 , wherein:
the first total number of PDCCH candidates M PDCCH,MCG total,μ is determined as M PDCCH,MCG total,μ =min {N cells,MCG DL,μ ·M PDCCH max,slot,μ , └N cells,MCG cap ·M PDCCH max,slot,μ ·N cells,MCG DL,μ /Σ μ=0 3 N cells,MCG DL,μ ┘};
M PDCCH max,slot,μ is a maximum number of PDCCH candidates per slot for a cell from the N cells,MCG DL,μ DL cells;
└x┘ is a ‘floor’ function that provides a largest integer that is smaller than x; and
min{x, y} is a ‘minimum’ function that provides a smaller of x, y.
4. The method of claim 1 , further comprising:
receiving the PDCCH candidates for the N cells,MCG DL,μ DL cells of the MN according to M PDCCH,MCG total,μ ; and
receiving the PDCCH candidates for the N cells,SCG DL,μ DL cells of the SN according to M PDCCH,SCG total,μ .
5. The method of claim 1 , further comprising:
determining a first total number of non-overlapped CCEs C PDCCH,MCG total,μ for the N cells,MCG DL,μ DL cells of the MN over the time period according to N cells,MCG cap ; and
determining a second total number of non-overlapped CCEs C PDCCH,SCG total,μ for the N cells,SCG DL,μ DL cells of the SN over the time period according to N cells,SCG cap .
6. The method of claim 1 , further comprising:
transmitting an indication for a number of cells N cells cap , wherein N cells,MCG cap +N cells,SCG cap ≤N cells cap .
7. The method of claim 1 , wherein the indication for the second number of cells N cells,SCG cap is transmitted from the MN to the SN.
8. A base station comprising:
a transmitter configured to transmit an indication for a first number of cells N cells,MCG cap and for a second number of cells N cells,SCG cap wherein MCG denotes a master cell group for a master node (MN) and SCG denotes a secondary cell group for a secondary node (SN); and
a processor configured to determine a number of physical downlink control channel (PDCCH) candidates M PDCCH,MCG total,μ for N cells,MCG DL,μ downlink (DL) cells over a time period according to N cells,MCG cap wherein μ is a subcarrier spacing (SCS) configuration for an active bandwidth part (BWP) for each of the N cells,MCG DL,μ DL cells.
9. The base station of claim 8 , wherein the time period is one slot for SCS configuration μ.
10. The base station of claim 9 , wherein:
the total number of PDCCH candidates M PDCCH,MCG total, μ is determined as M PDCCH,MCG total,μ =min {N cells,MCG DL,μ ·M PDCCH max,slot,μ , └N cells,MCG cap ·M PDCCH max,slot,μ ·N cells,MCG DL,μ /Σ μ=0 3 N cells,MCG DL,μ┘};
M PDCCH max,slot,μ is a maximum number of PDCCH candidates per slot for a cell from the N cells,MCG DL,μ cells;
└x┘ is a ‘floor’ function that provides a largest integer that is smaller than x; and
min{x, y} is a ‘minimum’ function that provides a smaller of x, y.
11. The base station of claim 8 , wherein the transmitter is further configured to transmit a PDCCH for a cell from the N cells,MCG DL,μ DL cells using a PDCCH candidate from the M PDCCH,MCG total,μ PDCCH candidates.
12. The base station of claim 8 , wherein the processor is further configured to determine a total number of non-overlapped CCEs C PDCCH,MCG total,μ for the N cells,MCG DL,μ DL cells over the time period according to N cells,MCG cap .
13. The base station of claim 8 , further comprising:
a receiver configured to receive an indication for a number of cells N cells cap , wherein N cells,MCG cap +N cells,SCG cap ≤N cells cap .
14. The base station of claim 8 , wherein the transmitter is further configured to transmit N cells,MCG cap over a first link and transmit N cells,SCG cap over the first link and over a second link.
15. A user equipment (UE) comprising:
a receiver configured to receive an indication for a first number of cells N cells,MCG cap and for a second number of cells N cells,SCG cap , wherein MCG denotes a master cell group for a master node (MN) and SCG denotes a secondary cell group for a secondary node (SN); and
a processor configured to determine:
a first total number of physical downlink control channel (PDCCH) candidates M PDCCH,MCG total,μ for N cells,MCG DL,μ downlink (DL) cells over a time period according to N cells,MCG cap , wherein μ is a subcarrier spacing (SCS) configuration for an active bandwidth part (BWP) for each of the N cells,MCG DL,μ DL cells, and
a second total number of PDCCH candidates M PDCCH,SCG total,μ for N cells,SCG DL,μ DL cells over the time period according to N cells,SCG cap , wherein μ is a SCS configuration for an active BWP for each of the N cells,SCG DL,μ DL cells.
16. The UE of claim 15 , wherein the time period is one slot for SCS configuration μ.
17. The UE of claim 16 , wherein:
the first total number of PDCCH candidates M PDCCH,MCG total,μ is determined as M PDCCH,MCG total,μ =min {N cells,MCG DL,μ ·M PDCCH max,slot,μ , └N cells,MCG cap ·M PDCCH max,slot,μ ·N cells,MCG DL,μ /Σ μ=0 3 N cells,MCG DL,μ┘};
M PDCCH max,slot,μ is a maximum number of PDCCH candidates per slot for a cell from the N cells,MCG DL,μ DL cells;
└x┘ is a ‘floor’ function that provides a largest integer that is smaller than x; and
min{x, y} is a ‘minimum’ function that provides a smaller of x, y.
18. The UE of claim 15 , wherein the receiver is further configured to receive:
PDCCH candidates for the N cells,MCG DL,μ cells according to M PDCCH,MCG total,μ ; and
PDCCH candidates for the N cells,SCG DL,μ cells according to M PDCCH,SCG total,μ .
19. The UE of claim 15 , wherein the processor is further configured to determine:
a first total number of non-overlapped CCEs C PDCCH,MCG total,μ for the N cells,MCG DL,μ DL cells over the time period according to N cells,MCG cap ; and
a second total number of non-overlapped CCEs C PDCCH,SCG total,μ for the N cells,SCG DL,μ DL cells over the time period according to N cells,SCG cap .
20. The UE of claim 15 , further comprising:
a transmitter configured to transmit an indication for a number of cells N cell cap , wherein N cells,MCG cap +N cells,SCG cap ≤N cells cap .