Methods for handling context information for mobile-terminated early data transmission
A method in a target network node and a corresponding network node, for performing secure Mobile Terminated (MT) early data transmission (EDT) is provided. The method may comprise: sending a paging message to the wireless device, which has been suspended from a connection with a second network node, the paging message comprising an early data transmission (EDT) indication; receiving a random access preamble from the wireless device; obtaining context information of the wireless device; and resuming a data connection with the wireless device based on the context information.
1. A method in a first network node for performing secure Mobile Terminated (MT) early data transmission (EDT), the method comprising:
sending a paging message to a wireless device, which has been suspended from a connection with a second network node, the paging message comprising an early data transmission (EDT) indication;
receiving a random access preamble from the wireless device;
obtaining, from the second network node, context information of the wireless device, wherein obtaining the context information comprises receiving, from a third network node, an identifier related to the wireless device, and wherein the identifier is received by fetching the identifier from a container uploaded to the first network node by the second network node; and
resuming a data connection with the wireless device based on the context information.
2. The method of claim 1 , wherein obtaining the context information further comprises:
sending a request for the context information to the second network node, the request comprising the identifier; and
in response to the request, receiving the context information from the second network node.
3. The method of claim 2 , wherein the identifier is one of a resume identifier for resuming a connection and an identifier of the wireless device allocated by the second network node.
4. The method of claim 3 , wherein the identifier of the wireless device allocated by the second network node is an eNB UE S1AP ID.
5. The method of claim 1 , wherein obtaining the context information comprises receiving the context information from the third network node in a paging message.
6. The method of claim 1 , wherein obtaining the context information further comprises obtaining security information.
7. The method of claim 6 , wherein the security information comprises temporary security context information.
8. The method of claim 1 , wherein the context information comprises one of full User Equipment (UE) context, partial UE context and temporary context.
9. The method of claim 1 , wherein the second network node is a source network node.
10. The method of claim 1 , wherein the third network node is a Mobility Management entity (MME).
11. A first network node for performing secure Mobile Terminated (MT) early data transmission (EDT), the first network node comprising:
a communication interface; and
processing circuitry connected to the communication interface, wherein the processing circuitry comprises a memory and a processor connected thereto, the memory containing instructions that, when executed, cause the processor to:
send a paging message to a wireless device, which has been suspended from a connection with a second network node, the paging message comprising an early data transmission (EDT) indication;
receive a random access preamble from the wireless device;
obtain, from the second network node, context information of the wireless device; and
resume a data connection with the wireless device based on the context information,
wherein the processor is configured to obtain the context information by receiving, from a third network node, an identifier related to the wireless device, and wherein the identifier is received by fetching the identifier from a container uploaded to the first network node by the second network node.
12. The first network node of claim 11 , wherein the processor is further configured to obtain the context information by:
sending a request for the context information to the second network node, the request comprising the identifier; and
in response to the request, receiving the context information from the second network node.
13. The first network node of claim 12 , wherein the identifier is one of a resume identifier for resuming a connection and an identifier of the wireless device allocated by the second network node.
14. The first network node of claim 13 , wherein the identifier of the wireless device allocated by the second network node is an eNB UE S1AP ID.
15. The first network node of claim 11 , wherein the processor is configured to obtain the context information by receiving the context information from a third network node in a paging message.
16. The first network node of claim 11 , wherein the processor is further configured to obtain security information.
17. The first network node of claim 16 , wherein the security information comprises temporary security context information.
18. The first network node of claim 11 , wherein the context information comprises one of full UE context, partial UE context and temporary context.
19. The first network node of claim 11 , wherein the second network node is a source network node.
20. The first network node of claim 11 , wherein the third network node is a Mobility Management entity (MME).