Reference signal configuration for enabling energy efficient system operation
The present invention provides apparatuses, methods, computer programs, computer program products and computer-readable media regarding reference signal configuration for enabling energy efficient system operation. The apparatus comprises determining whether discontinuous reception is applied to the user equipment, and if it is determined that the discontinuous reception is applied, determining whether a signal is present outside of an active time of the user equipment.
1. A method for use in a user equipment, said method comprising:
determining whether discontinuous reception is applied to the user equipment, in which the user equipment monitors a downlink channel during an active time of a discontinuous reception (DRX) cycle; and
in response to it being determined that the discontinuous reception is applied, detecting a length of the DRX cycle and determining whether a channel state information (CSI) signal is present outside of the active time of the user equipment based on a comparison between the detected length of the DRX cycle and a predetermined threshold, wherein it is determined that the CSI signal is present outside of the active time if the length of the DRX cycle is below the threshold, and determined that the CSI signal is not present outside of the active time if the length of the DRX cycle is above the threshold.
2. The method according to claim 1 , wherein
the downlink channel is a physical downlink control channel (PDCCH).
3. The method according to claim 1 , wherein
the length of the DRX cycle is indicated as a part of a CSI-RS configuration or a DRX configuration in a radio resource configuration information element (RRC IE).
4. The method according to claim 1 , wherein
the discontinuous reception is a connected mode discontinuous reception (C-DRX), and applied to the user equipment for monitoring the downlink channel.
5. The method according to claim 1 , wherein
the discontinuous reception is an IDLE mode discontinuous reception, and applied to the user equipment for monitoring the downlink channel.
6. An apparatus, comprising:
at least one processor; and
at least one memory including computer program code;
the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to perform:
determining whether discontinuous reception is applied to the user equipment, in which the user equipment monitors a downlink channel during an active time of a discontinuous reception (DRX) cycle; and
if it is determined that the discontinuous reception is applied, detecting a length of the DRX cycle and determining whether a channel state information (CSI) signal is present outside of the active time of the user equipment based on a comparison between the detected length of the DRX cycle and a predetermined threshold, wherein it is determined that the signal is present outside of the active time if the length of the DRX cycle is below the threshold, and determined that the signal is not present outside of the active time if the length of the DRX cycle is above the threshold.
7. The apparatus according to claim 6 , wherein
the downlink channel is a physical downlink control channel (PDCCH).
8. The apparatus according to claim 6 , wherein
the length of the DRX cycle is indicated as a part of a CSI-RS configuration or a DRX configuration in a radio resource configuration information element (RRC IE).
9. The apparatus according to claim 6 , wherein
the discontinuous reception is a connected mode discontinuous reception (C-DRX), and applied to the user equipment for monitoring the downlink channel.
10. The apparatus according to claim 6 , wherein
the discontinuous reception is an IDLE mode discontinuous reception, and applied to the user equipment for monitoring the downlink channel.
11. A computer program embodied on a non-transitory computer-readable medium, said computer program comprising computer readable code for use with a computer, the computer program, when executed on a computer, causing the computer to perform the method of claim 1 .
12. The method of claim 1 , further comprising:
perform a measurement outside the active time based on the determinization the length of the DRX cycle is below the threshold.
13. The apparatus of claim 6 , wherein the at least one memory and the computer program code are further configured to, with the at least one processor, cause the apparatus at least to perform:
perform a measurement outside the active time based on the determinization the length of the DRX cycle is below the threshold.