Mobility robustness in a cellular network

1. A method, performed by a user equipment, the method comprising:

starting a first timer and a second timer in response to different respective network events, wherein the starting of the first and second timers causes the first and second timers to simultaneously elapse; and

responsive to one of the simultaneously elapsing timers expiring, sending a radio link failure report to a node of a wireless communication network indicating which of the simultaneously elapsing timers expired.

2. The method of claim 1 , wherein starting the first timer and the second timer in response to the different respective network events comprises starting the first timer in response to detecting a physical layer problem with a radio link between the user equipment and the node.

3. The method of claim 1 , wherein starting the first timer and the second timer in response to the different respective network events comprises starting the second timer in response to being triggered to send a measurement report to the node.

4. The method of claim 3 , further comprising, responsive to the one of the simultaneously elapsing timers expiring, sending information to the node indicating a handover measurement event that triggered the sending of the measurement report to the node.

5. The method of claim 1 , further comprising, responsive to the one of the simultaneously elapsing timers expiring, sending information to the node indicating a handover configuration.

6. The method of claim 1 , further comprising, responsive to the one of the simultaneously elapsing timers expiring, sending information to the node regarding the other of the simultaneously elapsing timers.

7. The method of claim 1 , further comprising, responsive to the one of the simultaneously elapsing timers expiring, sending information to the node indicating a list of cells fulfilling measurement report triggering conditions.

8. The method of claim 1 , wherein the first timer is a T310 timer.

9. The method of claim 1 , wherein the second timer is a T312 timer.

10. The method of claim 1 , further comprising:

receiving, from the node, a message in response to the radio link failure report; and

adjusting a value of the first timer, a value of the second timer, and/or an extent to which a cell is considered for handover based on the message.

11. A user equipment comprising:

interface circuitry; and

processing circuitry communicatively coupled to the interface circuitry and configured to:

start a first timer and a second timer in response to different respective network events, wherein the starting of the first and second timers causes the first and second timers to simultaneously elapse; and

responsive to one of the simultaneously elapsing timers expiring, send a radio link failure report via the interface circuitry to a node of a wireless communication network, the radio link failure report indicating which of the simultaneously elapsing timers expired.

12. The user equipment of claim 11 , wherein to start the first timer and the second timer in response to the different respective network events, the processing circuitry is configured to start the first timer in response to detecting a physical layer problem with a radio link between the user equipment and the node.

13. The user equipment of claim 11 , wherein to start the first timer and the second timer in response to the different respective network events, the processing circuitry is configured to start the second timer in response to being triggered to send a measurement report to the node.

14. The user equipment of claim 13 , wherein the processing circuitry is further configured to, responsive to the one of the simultaneously elapsing timers expiring, send information to the node indicating a handover measurement event that triggered the sending of the measurement report to the node.

15. The user equipment of claim 11 , wherein the processing circuitry is further configured to, responsive to the one of the simultaneously elapsing timers expiring, send information to the node indicating a handover configuration.

16. The user equipment of claim 11 , wherein the processing circuitry is further configured to, responsive to the one of the simultaneously elapsing timers expiring, send information to the node regarding the other of the simultaneously elapsing timers.

17. The user equipment of claim 11 , wherein the processing circuitry is further configured to, responsive to the one of the simultaneously elapsing timers expiring, send information to the node indicating a list of cells fulfilling measurement report triggering conditions.

18. The user equipment of claim 11 , wherein the first timer is a T310 timer.

19. The user equipment of claim 11 , wherein the second timer is a T312 timer.

20. The user equipment of claim 11 , wherein the processing circuitry is further configured to:

receive, from the node, a message in response to the radio link failure report; and

adjust a value of the first timer, a value of the second timer, and/or an extent to which a cell is considered for handover based on the message.

21. A non-transitory computer readable medium storing a computer program product for controlling a programmable user equipment in a wireless communication network, the computer program product comprising software instructions that, when executed by processing circuitry of the programmable user equipment, cause the programmable user equipment to:

start a first timer and a second timer in response to different respective network events, wherein the starting of the first and second timers causes the first and second timers to simultaneously elapse; and

responsive to one of the simultaneously elapsing timers expiring, send a radio link failure report to a node of the wireless communication network indicating which of the simultaneously elapsing timers expired.