Telecommunications apparatus and methods

A terminal device for use in a wireless telecommunications system in which downlink communications are made by a base station using a radio interface that spans a system frequency bandwidth and the terminal device is configured to receive at least some communications from the base station within a restricted subset of transmission resources selected from within the system frequency bandwidth and comprising a downlink channel having a channel bandwidth which is smaller than the system frequency bandwidth, and wherein the wireless telecommunications system supports a Radio Resource Control (RRC) connected mode of operation in which the terminal device receives a type of user-plane data using the restricted subset of transmission resources and an RRC idle mode of operation in which terminal device does not receive the type of user-plane data, wherein the terminal device comprises:

• a transceiver configured to receive from the base station a paging message comprising an indication that updated system information is to be broadcast by the base station while the terminal device is in the RRC connected mode and indicating transmission resources to be used to broadcast the updated system information;
• and
• a controller configured to cause the terminal device to, responsive to the indication that the updated system information is to be broadcast by the base station,
• transition from the RRC connected mode to the RRC idle mode before seeking to acquire the updated system information and to seek to acquire the updated system information broadcast by the base station via the indicated transmission resources, while the terminal device is in the RRC idle mode.

A base station for use in a wireless telecommunications system in which downlink communications are made by the base station using a radio interface that spans a system frequency bandwidth and the base station is configured to transmit at least some communications to at least one terminal device within a restricted subset of transmission resources selected from within the system frequency bandwidth and comprising a downlink channel having a channel bandwidth which is smaller than the system frequency bandwidth, and wherein the wireless telecommunications system supports the terminal device in a connected mode of operation in which the base station transmits a type of user-plane data to the terminal device using the restricted subset of transmission resources and an idle mode of operation in which the base station does not transmit the type of user-plane data to the terminal device, wherein the base station comprises:

• a transceiver configured to transmit an indication that updated system information is to be broadcast by the base station while the terminal device is in the connected mode and
• a controller configured to restrict the scheduling of user-plane data transmissions for the terminal device from a time associated with the broadcast of the updated system information until after the terminal device re-enters the connected mode after having transitioned to the idle mode following the transmission of the indication that updated system information is to be broadcast.