A network device arranged to wirelessly communicate with a user equipment (UE), the network device being arranged to receive a Radio Resource Control (RRC) Connection Request message as part of a wireless connection establishment procedure for forming a wireless connection between the UE and the network, said RRC Connection Request message including an RRC establishment cause, wherein the RRC establishment cause is configurable to include any of a plurality of different cause indicators including:
- a mobile terminating access (mt-Access) indicator,
- a mobile originating data (mo-data) indicator, and
- at least one further indicator of mobile originating data that is used for the UE when operating in a small data transmission mode.