Method and apparatus for CIoT device data transfer

1. User equipment (UE), comprising:

a wireless transceiver configured to communicate with a network; and

processing circuitry including at least one processing device and at least one memory device, wherein the processing circuitry is configured to:

enter into an idle state without an established signaling connection to the network;

obtain pending user data for transmission;

generate an indication that subsequent downlink data is not expected;

insert the user data and the indication into a control plane service request message; and

transmit the control plane service request message to the network using a control signaling protocol.

2. The UE of claim 1 , wherein the processing circuitry is configured to generate an indication that downlink data transmission is not needed by:

generating an information element in the control plane service request that indicates an acknowledgement subsequent to transmission of the control plane service request message to the network is not expected.

3. The UE of claim 2 , wherein the processing circuitry is further configured to:

end control plane service request when the information element in the control plane service request indicates that subsequent downlink data is not expected.

4. The UE of claim 1 , wherein the processing circuitry is further configured to:

generate a data type field that indicates an IP data type, wherein the user data includes an IP packet.

5. The UE of claim 1 , wherein the processing circuitry is configured to:

enter into a registered state in response to transmission of the control plane service request message.

6. The UE of claim 1 , wherein the processing circuitry is further configured to insert the user data into a control plane service request message by:

inserting the user data into an information element; and

indicating a control plane network service in the control plane service request message.

7. The UE of claim 6 , wherein the processing circuitry is further configured to indicate a control plane cellular internet of things (CP-CIoT) service in the control plane service request message.

8. The UE of claim 1 , wherein the processing circuitry is further configured to:

generate a control plane attach request message and indicate a preferred network capability value in the control plane attach request message, wherein the preferred network capability value indicates at least one of: UP-CIoT, CP-CIoT or SMS-data-only.

9. The UE of claim 8 , wherein the processing circuitry is further configured to:

receive an attach response indicating a rejection of the control plane attach request message, wherein a cause information element in the attach response includes a value indicating an unsupported CIoT optimization.

10. A Mobility Management Entity (MME) node, comprising:

a network interface configured to communicate with user equipment (UE) over a control plane signaling channel; and

processing circuitry including at least one processing device and at least one memory device, wherein the processing circuitry is configured to:

receive a control plane service request message from the UE;

extract user data from a message information element in the control plane service request message;

extract an indication in the control plane service request message that subsequent downlink data is not expected;

end a signaling plane session with the UE in response to the information element in the control plane service request that indicates subsequent downlink data is not expected; and

forward the user data to another network node.

11. The MME of claim 10 , wherein the indication in the control plane service request message that subsequent downlink data is not expected indicates an acknowledgement subsequent to transmission of the control plane service request message to the network is not expected.

12. The MME node of claim 10 , wherein the processing circuitry is configured to:

determine a type of the user data includes non-IP data; and

forward the non-IP data to a node including a Service Capability Exposure Function (SCEF).

13. The MME node of claim 10 , wherein the processing circuitry is further configured to:

determine a type of the user data includes IP data; and

forward the IP data to a packet gateway.

14. The MME node of claim 10 , wherein the processing circuitry is further configured to:

receive an attach request message from the UE;

determine the attach request message requests CP-CIoT services with SMS only data without combined attach; and

generate an attach response indicating a rejection of the attach request and including a cause information element in the attach response indicating an unsupported CIoT optimization.

15. User equipment (UE), comprising:

a wireless transceiver configured to communicate with a network; and

processing circuitry including at least one processing device and at least one memory device, wherein the processing circuitry is configured to:

enter into an idle state without an established signaling connection to the network;

obtain pending short message service (SMS) data for transmission;

generate an indication that subsequent downlink data is not expected;

insert the SMS data and the indication into a control plane service request message; and

transmit the control plane service request message to the network using a control signaling protocol.

16. The UE of claim 15 , wherein the processing circuitry is configured to:

insert the SMS data into an SMS message container in the control plane service request message.

17. The UE of claim 15 , wherein the processing circuitry is configured to generate an indication that downlink data transmission is not expected by:

generating an information element in the control plane service request that indicates an acknowledgement subsequent to transmission of the control plane service request message to the network is not expected.

18. The UE of claim 17 , wherein the processing circuitry is further configured to:

end control plane service request when the information element in the control plane service request indicates that subsequent downlink data is not expected.

19. The UE of claim 15 , wherein an S1 signaling connection is released when the information element in the control plane service request indicates that subsequent downlink data is not expected.

20. The UE of claim 15 , wherein the processing circuitry is further configured to:

generate an indication that downlink data transmission is expected; and

retain an S1 signaling connection in response to the indication that downlink data transmission is expected.