UE identifier in RRC resume

1. A method of operation of a wireless device, comprising:

receiving, from a wireless network, a first message that indicates to suspend a connection between the wireless device and the wireless network;

responsive to receiving the first message, storing a wireless device context and entering a suspended mode of operation;

upon an occurrence of a triggering event, transmitting, to the wireless network, a second message that requests to resume the connection between the wireless device and the wireless network, wherein the second message comprises a resume identifier including: an identifier of a network node; and an identifier of the wireless device; and

receiving, from the wireless network, a contention resolution identity Medium Access Control (MAC) control element that includes a portion of the second message, wherein the portion of the second message is truncated to a size of the contention resolution identity MAC control element.

2. The method of claim 1 , wherein the portion of the second message that is received from the wireless network corresponds to the resume identifier.

3. The method of claim 1 , further comprising:

performing contention resolution by matching the resume identifier with the portion of the second message.

4. The method of claim 1 , wherein the size of the contention resolution identity MAC control element is 48 bits.

5. The method of claim 1 , wherein the portion of the second message is transmitted in an uplink common control channel service data unit.

6. The method of claim 1 , wherein the second message comprises an RRC Connection Resume Request.

7. The method of claim 1 , wherein the second message is transmitted in an uplink common control channel service data unit.

8. The method of claim 1 , wherein the contention resolution identity MAC control element is associated with a third message that indicates that the connection between the wireless device and the wireless network is to be resumed.

9. The method of claim 1 , wherein the stored wireless device context is used for resuming the connection.

10. A wireless device, comprising:

a non-transitory memory; and

one or more hardware processors coupled to the non-transitory memory and configured to read instructions from the non-transitory memory to cause the wireless device to perform operations comprising:

receiving, from a wireless network, a first message that indicates to suspend a connection between the wireless device and the wireless network;

responsive to receiving the first message, storing a wireless device context and entering a suspended mode of operation;

upon an occurrence of a triggering event, transmitting, to the wireless network, a second message that requests to resume the connection between the wireless device and the wireless network, wherein the second message comprises a resume identifier including: an identifier of a network node; and an identifier of the wireless device; and

receiving, from the wireless network, a contention resolution identity Medium Access Control (MAC) control element that includes a portion of the second message, wherein the portion of the second message is truncated to a size of the contention resolution identity MAC control element.

11. The wireless device of claim 10 , wherein the portion of the second message that is received from the wireless network corresponds to the resume identifier.

12. The wireless device of claim 10 , the operations further comprising: performing contention resolution by matching the resume identifier with the portion of the second message.

13. The wireless device of claim 10 , wherein the size of the contention resolution identity MAC control element is 48 bits.

14. The wireless device of claim 10 , wherein the portion of the second message is transmitted in an uplink common control channel service data unit.

15. The wireless device of claim 10 , wherein the contention resolution identity MAC control element is associated with a third message that indicates that the connection between the wireless device and the wireless network is to be resumed.

16. The wireless device of claim 10 , wherein the stored wireless device context is used for resuming the connection.

17. A non-transitory computer readable medium having stored thereon machine-readable instructions executable to cause a wireless device to perform operations comprising:

receiving, from a wireless network, a first message that indicates to suspend a connection between the wireless device and the wireless network;

responsive to receiving the first message, storing a wireless device context and entering a suspended mode of operation;

upon an occurrence of a triggering event, transmitting, to the wireless network, a second message that requests to resume the connection between the wireless device and the wireless network, wherein the second message comprises a resume identifier including: an identifier of a network node; and an identifier of the wireless device; and

receiving, from the wireless network, a contention resolution identity Medium Access Control (MAC) control element that includes a portion of the second message, wherein the portion of the second message is truncated to a size of the contention resolution identity MAC control element.

18. The non-transitory computer readable medium of claim 17 , wherein the portion of the second message that is received from the wireless network corresponds to the resume identifier,

wherein the contention resolution identity MAC control element is associated with a third message that indicates that the connection between the wireless device and the wireless network is to be resumed.