Method and apparatus for offloading idle mode activities from one user equipment to another

A user equipment (UE), comprising:

• a cellular modem circuitry for wireless communication with a base station of a cellular wireless wide area network, wherein the cellular modem circuitry is configured to perform idle mode activities during an idle mode;
• a device-to-device modem circuitry for direct wireless communication with a primary UE;
• a processor configured to control the cellular modem circuitry and the device-to-device modem circuitry,
• wherein the processor is configured to receive information necessary for performing idle mode activities from the primary UE, control the cellular modem circuitry to perform the idle mode activities for the primary UE based on the received information, and send a wake-up signal to the primary UE using the device-to-device modem circuitry if a paging indication for the primary UE is detected.

A method for offloading idle mode activities, comprising:

• sending, by a primary user equipment (UE), information necessary for performing idle mode activities to a secondary UE for offloading the idle mode activities of the primary UE to the secondary UE;
• putting a cellular modem circuitry in the primary UE in a low power state or turning off the cellular modem circuitry in the primary UE during the idle mode;
• and
• waking up the cellular modem circuitry to receive a paging message if a wake-up signal is received from the secondary UE via a device-to-device modem circuitry.

A method for offloading idle mode activities, comprising:

• receiving, by a secondary user equipment (UE), information necessary for performing idle mode activities from a primary UE;
• controlling a cellular modem circuitry in the secondary UE to perform the idle mode activities for the primary UE based on the received information;
• and
• sending a wake-up signal to the primary UE via a device-to-device modem circuitry if a paging indication for the primary UE is detected.