Connection reestablishment procedure
A wireless device communicates, with a first base station, based on a first next hop chaining count (NCC) value. The wireless device receives, from the first base station, a first radio resource control (RRC) message comprising a second NCC value. The wireless device determines a failure of the communicating with the first base station based on the first NCC value. The wireless device selects, based on the failure, a cell of a second base station. The wireless device transmits, to the second base station, based on the second NCC value received from the first base station, a second RRC message requesting to establish an RRC connection with the second base station.
1. A method comprising:
communicating, by a wireless device with a first base station, based on a first next hop chaining count (NCC) value;
receiving, by the wireless device from the first base station, a first radio resource control (RRC) message comprising a second NCC value;
determining, by the wireless device, a failure of the communicating with the first base station based on the first NCC value;
selecting, by the wireless device, based on the failure, a cell of a second base station; and
transmitting, by the wireless device to the second base station, based on the second NCC value received from the first base station, a second RRC message requesting to establish an RRC connection with the second base station.
2. The method of claim 1 , further comprising transmitting, by the wireless device to the second base station, based on the second NCC value, one or more packets.
3. The method of claim 1 , further comprising receiving, by the wireless device from the second base station, a third RRC message indicating establishment of the RRC connection with the second base station.
4. The method of claim 1 , further comprising deriving, based on the selecting, a second security key of the second base station based on the second NCC.
5. The method of claim 1 , wherein the first base station is the second base station.
6. The method of claim 1 , further comprising storing the second NCC value during the communicating based on the first NCC value.
7. The method of claim 1 , wherein the communicating based on the first NCC value is while the second NCC value is stored.
8. The method of claim 1 , wherein the communicating based on the first NCC value is while the wireless device is in an RRC connected state.
9. The method of claim 1 , wherein the determining the failure of the communicating based on the first NCC value is after the receiving the first RRC message.
10. The method of claim 1 , wherein the receiving of the first RRC message comprising the second NCC value is during the communicating based on the first NCC value.
11. A wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
communicate, with a first base station, based on a first next hop chaining count (NCC) value;
receive, from the first base station, a first radio resource control (RRC) message comprising a second NCC value;
determine a failure of the communicating with the first base station based on the first NCC value;
select based on the failure, a cell of a second base station; and
transmit, to the second base station, based on the second NCC value received from the first base station, a second RRC message requesting to establish an RRC connection with the second base station.
12. The wireless device of claim 11 , further comprising transmitting, by the wireless device to the second base station, based on the second NCC value, one or more packets.
13. The wireless device of claim 11 , further comprising receiving, by the wireless device from the second base station, a third RRC message indicating establishment of the RRC connection with the second base station.
14. The wireless device of claim 11 , further comprising deriving, based on the selecting, a second security key of the second base station based on the second NCC.
15. The wireless device of claim 11 , further comprising storing the second NCC value during the communicating based on the first NCC value.
16. The wireless device of claim 11 , wherein the communicating based on the first NCC value is while the second NCC value is stored.
17. The wireless device of claim 11 , wherein the communicating based on the first NCC value is while the wireless device is in an RRC connected state.
18. The wireless device of claim 11 , wherein the determining the failure of the communicating based on the first NCC value is after the receiving the first RRC message.
19. The wireless device of claim 11 , wherein the receiving of the first RRC message comprising the second NCC value is during the communicating based on the first NCC value.
20. A non-transitory computer-readable storing instructions that, when executed by a wireless device, cause the wireless device to perform a process, the process comprising:
communicate, with a first base station, based on a first next hop chaining count (NCC) value;
receive, from the first base station, a first radio resource control (RRC) message comprising a second NCC value;
determine a failure of the communicating with the first base station based on the first NCC value;
select based on the failure, a cell of a second base station;
transmit, to the second base station, based on the second NCC value received from the first base station, a second RRC message requesting to establish an RRC connection with the second base station.