Method and system for performing cell update and routing area update procedures while a wireless transmit/receive unit is in an idle state

In a wireless communication system including a wireless transmit/receive unit (WTRU), an evolved Node-B (eNode-B) and a mobility management entity (MME)/user plane entity (UPE), a method of performing a routing area (RA) update procedure while the WTRU is in an idle state, the method comprising:

• the WTRU in an idle state reading system information transmitted by the eNode-B;
• the WTRU transitioning from an idle state to an active state if it is determined that the WTRU is in a new RA based on the system information;
• the WTRU sending an RA update message to the eNode-B;
• the eNode-B forwarding the RA update message to the MME/UPE;
• and
• the MME/UPE updating the RA for the WTRU based on the RA update message.

A wireless communication system configured to perform a cell update procedure while a wireless transmit/receive unit (WTRU) is in an idle state, the system comprising:

• a WTRU configured to transition from an idle state to an active state and send a cell update message to an evolved Node-B (eNode-B);
• the eNode-B configured to forward the cell update message to a mobility management entity (MME)/user plane entity (UPE);
• and
• the MME/UPE configured to change a state machine for the WTRU in the MME/UPE to an active state and take an action based on the cell update message.

A wireless communication system configured to perform a routing area (RA) update procedure while a wireless transmit/receive unit (WTRU) is in an idle state, the system comprising:

• a WTRU configured to read system information transmitted by an evolved Node-B (eNode-B) while the WTRU is in an idle state, transition from an idle state to an active state if it is determined that the WTRU is in a new RA based on the system information, and send an RA update message to the eNode-B;
• the eNode-B configured to forward the RA update message to a mobility management entity (MME)/user plane entity (UPE);
• and
• the MME/UPE configured to update an RA for the WTRU based on the RA update message.