Systems and methods for inter-radio access technology (RAT) mobility

A computer program product comprising a computer-readable medium including codes for causing a computer to:

• camp a user terminal in an Idle mode in a first wireless network cell, wherein the first wireless network is a GERAN or UTRAN network;
• change, based on an application executing on the user terminal, a user terminal usage mode from a Voice Centric mode to a Data Centric mode;
• initiate a Routing Area Update (RAU) procedure from the user terminal, the RAU procedure including:
• providing information associated with the user terminal usage mode change from the user terminal;
• and
• receiving new Cell Priority Information from the wireless network;
• select an E-UTRAN cell;
• and
• perform data communications associated with the application with a base station of the E-UTRAN cell.

A multi-network communications device, comprising:

• a receiver module configured to receive signals from a first wireless network cell and camp a user terminal in an Idle mode on the first wireless network cell, wherein the first wireless network cell is a GERAN or UTRAN cell;
• a processor module configured to change, based on an application executing on the user terminal, a user terminal usage mode from a Voice Centric mode to a Data Centric mode;
• and
• a transmitter module configured to:
• initiate a Routing Area Update (RAU) procedure from the user terminal, the RAU procedure including providing information associated with the usage mode change from the user terminal;
• wherein the receiver module is further configured to receive new Cell Priority Information from the first wireless network;
• and
• wherein the processor module is configured to select an E-UTRAN wireless network cell;
• and
• wherein the transmitter and receiver modules are configured to perform data communications associated with the application with a base station of the selected E-UTRAN wireless network cell.