Cell identification collision detection in wireless communications

1. A method for mitigating local cell identifier collision by a base station, comprising:

receiving, at a first base station from a user device, a reconnection message including a user device identifier and a local cell identifier;

determining, at the first base station, a potential local cell identifier collision between the first base station and a second base station based on the user device identifier and the local cell identifier;

receiving, following the reconnection message, a connection establishment request indicating a presence of a Radio Link Failure (RLF) report;

retrieving, in response to determining the potential local cell identifier collision and in response to receiving the connection establishment request, a global cell identifier from the RLF report;

confirming the potential local cell identifier collision based on a mismatch between the global cell identifier of the RLF report and a global cell identifier associated with the first base station; and

modifying or causing to be modified, by the first base station, one or more communication parameters of the first base station or the second base station in response to the confirmed potential local cell identifier collision.

2. The method of claim 1 , wherein the user device identifier includes a Cell Radio Network Temporary Identifier (c-RNTI) and the local cell identifier includes a Physical Cell Identifier (PCI).

3. The method of claim 2 , wherein the determining the potential local cell identifier collision is based on the PCI received matching a PCI of the first base station and the c-RNTI not matching any c-RNTIs assigned to any user devices by the first base station.

4. The method of claim 2 , wherein the reconnection message further includes a shortMAC-I.

5. The method of claim 4 , wherein the determining the potential local cell identifier collision is based on the PCI received matching a PCI of the first base station and the c-RNTI matching a c-RNTI assigned to at least one user device by the first base station, and the shortMAC-I not matching a current shortMAC-I of the same user device that is assigned the matching c-RNTI by the first base station.

6. The method of claim 1 , further comprising receiving a preamble signature assigned to the user device.

7. The method of claim 6 , wherein the determining the potential local cell identifier collision is based on the first base station not having assigned the preamble signature to any user devices.

8. The method of claim 6 , wherein the determining the potential local cell identifier collision is based on the first base station having assigned the preamble signature to a user device under control of the first base station and the preamble signature being received at an unexpected time without uplink data.

9. An apparatus for mitigating local cell identifier collision by a base station, comprising:

at least one processor configured to:

receive, at a first base station from a user device, a reconnection message including a user device identifier and a local cell identifier,

determine, at the first base station, a potential local cell identifier collision between the first base station and a second base station based on the user device identifier and the local cell identifier,

receive, following the reconnection message, a connection establishment request indicating a presence of a Radio Link Failure (RLF) report,

retrieve, in response to determining the potential local cell identifier collision and in response to receiving the connection establishment request, a global cell identifier from the RLF report,

confirm the potential local cell identifier collision based on a mismatch between the global cell identifier of the RLF report and a global cell identifier associated with the first base station, and

modify or cause to be modified, by the first base station, one or more communication parameters of the first base station or the second base station in response to the confirmed potential local cell identifier collision; and

memory coupled to the at least one processor.

10. The apparatus of claim 9 , wherein the user device identifier includes a Cell Radio Network Temporary Identifier (c-RNTI) and the local cell identifier includes a Physical Cell Identifier (PCI).

11. The apparatus of claim 10 , wherein the at least one processor is configured to determine the potential local cell identifier collision based on the PCI received matching a PCI of the first base station and the c-RNTI not matching any c-RNTIs assigned to any user devices by the first base station.

12. The apparatus of claim 10 , wherein the reconnection message further includes a shortMAC-I.

13. The apparatus of claim 12 , wherein the at least one processor is configured to determine the potential local cell identifier collision based on the PCI received matching a PCI of the first base station and the c-RNTI matching a c-RNTI assigned to at least one user device by the first base station, and the shortMAC-I not matching a current shortMAC-I of the same user device that is assigned the matching c-RNTI by the first base station.

14. The apparatus of claim 9 , the at least one processor being further configured to receive a preamble signature assigned to the user device.

15. The apparatus of claim 14 , wherein the at least one processor is configured to determine the potential local cell identifier collision based on the first base station not having assigned the preamble signature to any user devices.

16. The apparatus of claim 14 , wherein the at least one processor is configured to determine the potential local cell identifier collision based on the first base station having assigned the preamble signature to a user device under control of the first base station and the preamble signature being received at an unexpected time without uplink data.

17. An apparatus for detecting local cell identifier collision by a base station, comprising:

means for receiving, at a first base station from a user device, a reconnection message including a user device identifier and a local cell identifier;

means for determining, at the first base station, a potential local cell identifier collision between the first base station and a second base station based on the user device identifier and the local cell identifier;

means for receiving, following the reconnection message, a connection establishment request indicating a presence of a Radio Link Failure (RLF) report;

means for retrieving, in response to determining the potential local cell identifier collision and in response to receiving the connection establishment request, a global cell identifier from the RLF report;

means for confirming the potential local cell identifier collision based on a mismatch between the global cell identifier of the RLF report and a global cell identifier associated with the first base station; and

means for modifying or causing to be modified, by the first base station, one or more communication parameters of the first base station or the second base station in response to the confirmed potential local cell identifier collision.

18. The apparatus of claim 17 , wherein the user device identifier includes a Cell Radio Network Temporary Identifier (c-RNTI) and the local cell identifier includes a Physical Cell Identifier (PCI).

19. The apparatus of claim 18 , wherein the means for determining comprises means for determining the potential local cell identifier collision based on the PCI received matching a PCI of the first base station and the c-RNTI not matching any c-RNTIs assigned to any user devices by the first base station.

20. The apparatus of claim 18 , wherein the reconnection message further includes a shortMAC-I.

21. The apparatus of claim 20 , wherein the means for determining comprises means for determining the potential local cell identifier collision based on the PCI received matching a PCI of the first base station and the c-RNTI matching a c-RNTI assigned to at least one user device by the first base station, and the shortMAC-I not matching a current shortMAC-I of the same user device that is assigned the matching c-RNTI by the first base station.

22. The apparatus of claim 17 , further comprising means for receiving a preamble signature assigned to the user device by the second base station.

23. The apparatus of claim 22 , wherein the means for determining comprises means for determining the potential local cell identifier collision based on the first base station not having assigned the preamble signature to any user devices.

24. The apparatus of claim 22 , wherein the means for determining comprises means for determining the potential local cell identifier collision based on the first base station having assigned the preamble signature to a user device under control of the first base station and the preamble signature being received at an unexpected time without uplink data.

25. A non-transitory computer-readable medium comprising code, which, when executed by at least one processor, causes the at least one processor to perform operations for detecting local cell identifier collision by a base station, the non-transitory computer-readable medium comprising:

code for receiving, at a first base station from a user device, a reconnection message including a user device identifier and a local cell identifier;

code for determining, at the first base station, a potential local cell identifier collision between the first base station and a second base station based on the user device identifier and the local cell identifier;

code for receiving, following the reconnection message, a connection establishment request indicating a presence of a Radio Link Failure (RLF) report;

code for retrieving, in response to determining the potential local cell identifier collision and in response to receiving the connection establishment request, a global cell identifier from the RLF report;

code for confirming the potential local cell identifier collision based on a mismatch between the global cell identifier of the RLF report and a global cell identifier associated with the first base station; and

code for modifying or causing to be modified, by the first base station, one or more communication parameters of the first base station or the second base station in response to the confirmed potential local cell identifier collision.

26. The non-transitory computer-readable medium of claim 25 , wherein the user device identifier includes a Cell Radio Network Temporary Identifier (c-RNTI) and the local cell identifier includes a Physical Cell Identifier (PCI).

27. The non-transitory computer-readable medium of claim 26 , wherein the code for determining comprises code for determining the potential local cell identifier collision based on the PCI received matching a PCI of the first base station and the c-RNTI not matching any c-RNTIs assigned to any user devices by the first base station.

28. The non-transitory computer-readable medium of claim 26 , wherein the reconnection message further includes a shortMAC-I.

29. The non-transitory computer-readable medium of claim 28 , wherein the code for determining comprises code for determining the potential local cell identifier collision based on the PCI received matching a PCI of the first base station and the c-RNTI matching a c-RNTI assigned to at least one user device by the first base station, and the shortMAC-I not matching a current shortMAC-I of the same user device that is assigned the matching c-RNTI by the first base station.

30. The non-transitory computer-readable medium of claim 25 , further comprising code for receiving a preamble signature assigned to the user device by the second base station.

31. The non-transitory computer-readable medium of claim 30 , wherein the code for determining comprises code for determining the potential local cell identifier collision based on the first base station not having assigned the preamble signature to any user devices.

32. The non-transitory computer-readable medium of claim 30 , wherein the code for determining comprises code for determining the potential local cell identifier collision based on the first base station having assigned the preamble signature to a user device under control of the first base station and the preamble signature being received at an unexpected time without uplink data.

33. The method of claim 1 , wherein the user device identifier identifies the user device and associates the user device with the second base station as a serving cell.