Connected Mode Discontinuous Reception for Narrow Band Internet of Things
First Claim
1. A method comprising:
- receiving a control signal by a user equipment (UE) for configuring a number of narrowband physical downlink control channel (NB-PDCCH) periods that carry downlink control information (DCI), wherein each NB-PDCCH period refers to an interval between the start of two consecutive NB-PDCCH occasions;
configuring discontinuous reception (DRX) parameters by the UE for DRX operation in radio resource control (RRC) connected mode;
determining a NB-PDCCH user-specific search space (USS) for each NB-PDCCH period, wherein each NB-PDCCH USS comprises a repetition level of NB-PDCCH subframes for NB-PDCCH transmission; and
monitoring the DCI for a monitoring time such that the UE monitors a total number of NB-PDCCH USSs during an On Duration of each DRX cycle.
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Abstract
A novel and efficient DRX operation mechanism is proposed to maintain the reliability and energy efficiency for NB-IOT systems. In NB-IOT systems, the length of a NB-PDCCH (with repetition) and the interval between two NB-PDCCHs are extended and can be reconfigured by eNB for each UE. The eNB can also adaptively adjusts the DRX parameters accordingly. NB-IOT UE monitors the NB-PDCCH in DRX ON duration, which is configured in number of NB-PDCCHs. Specifically, if a DRX timer duration is configured by the eNB in units of a PDCCH period, the UE should calculate the timer in terms of number of PDCCH user-specific search spaces (USSs), or in terms of PDCCH subframes by multiplying the number of PDCCH periods with the PDCCH repetition level.
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Citations
20 Claims
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1. A method comprising:
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receiving a control signal by a user equipment (UE) for configuring a number of narrowband physical downlink control channel (NB-PDCCH) periods that carry downlink control information (DCI), wherein each NB-PDCCH period refers to an interval between the start of two consecutive NB-PDCCH occasions; configuring discontinuous reception (DRX) parameters by the UE for DRX operation in radio resource control (RRC) connected mode; determining a NB-PDCCH user-specific search space (USS) for each NB-PDCCH period, wherein each NB-PDCCH USS comprises a repetition level of NB-PDCCH subframes for NB-PDCCH transmission; and monitoring the DCI for a monitoring time such that the UE monitors a total number of NB-PDCCH USSs during an On Duration of each DRX cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A user equipment (UE) comprising:
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a receiver that receives a control signal for configuring a number of narrowband physical downlink control channel (NB-PDCCH) periods that carry downlink control information (DCI), wherein each NB-PDCCH period refers to an interval between the start of two consecutive NB-PDCCH occasions; a configuration circuit that configures discontinuous reception (DRX) parameters by the UE for DRX operation in radio resource control (RRC) connected mode; and a monitoring circuit that determines a NB-PDCCH user-specific search space (USS) for each NB-PDCCH period, wherein each NB-PDCCH USS comprises a repetition number of NB-PDCCH subframes for NB-PDCCH transmission, and wherein the UE monitors the DCI for a monitoring time such that the UE monitors a total number of NB-PDCCH USSs during an On Duration of each DRX cycle. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification