Procedures, methods, architectures, apparatuses, systems, devices, and
computer program products are provided for network-initiated
wireless transmit / receive unit (WTRU) registration. WTRU methods and systems include scanning for and receiving a first
system information block (SIB) including network-initiated registration (NIR) information from a
wireless network, where the WTRU is not registered with the
wireless network and the scanning is based on a scanning configuration. The methods and systems further include transmitting a request for a second SIB to the
wireless network based on the NIR information of the first SIB indicating that additional NIR information is available and receiving the second SIB, which includes the additional NIR information. The methods and
system additionally include transmitting a registration request to the
wireless network based on the NIR information and on the additional NIR information, where the
wireless network registers the WTRU based on the registration request.