Methods, systems, and apparatus for identifying a device/user behind a residential gateway and for handling unrecognized devices

A wireless transmit/receive unit (WTRU), the WTRU comprising:

• a processor, wherein the processor is configured to:
• establish a first Protocol Data Unit (PDU) session to a first network node;
• establish a second PDU session with a second network node;
• receive a first message from a device, wherein the first message indicates a first Dynamic Host Configuration protocol (DHCP) request;
• determine a device identifier associated with the DHCP request based on configuration information and a characteristic of the DHCP request;
• generate a second message, wherein the second message indicates the DHCP request and a remote identification (ID) option value, wherein the remote ID option value is set to the device identifier;
• and
• send the second message to the first network node using the first PDU session.
• receive a third message from the network node, wherein the third message indicates a DHCP response, and wherein the DHCP response indicates an error code;
• send a fourth message to the device, wherein the fourth message indicates the DHCP response;
• receive a fifth message from the device, wherein the fifth message indicates a second DHCP request;
• determine that the second DHCP request is associated with the error code;
• and
• send a sixth message to the second network node using the second PDU session.