Dynamic Uplink/Downlink Configuration

An apparatus comprising:

• at least one processor;
• and
• at least one non-transitory 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 to:
• monitor, in the apparatus, a physical downlink control channel during an active period of a discontinuous reception DRX cycle, wherein the apparatus comprises a user terminal, and wherein, for defining a time division duplex TDD configuration for the user terminal when an inactive period of the discontinuous reception DRX cycle changes into the active period of the discontinuous reception DRX cycle;
• monitor, in the user terminal, downlink sub-frames and DwPTS sub-frames according to a downlink HARQ reference configuration until an update of the time division duplex TDD configuration is received;
• monitor, in the user terminal, the physical downlink control channel for any sub-frames except for sub-frames scheduled or configured for uplink transmission by the downlink HARQ reference configuration until the update of the time division duplex TDD configuration is received;
• monitor, in the user terminal, the physical downlink control channel for sub-frames when the user terminal monitors the physical downlink control channel for paging where time division duplex TDD configuration modification is sent;
• and
• utilize, in the user terminal, the time division duplex TDD configuration according to a first system information block SIB1 when the inactive period of the discontinuous reception changes into the active period of the discontinuous reception when the user terminal missed a TDD configuration modification occasion known by a base station and the user terminal.