False base station detection based on time of arrival or timing advance
A base station determines a window of time for arrival of uplink signals, wherein the window of time includes a start based on a first expected time of arrival for a first uplink signal from a first UE and an end based on a second expected time of arrival for a second uplink signal from a second UE. The base station detection detects a false base station, such as a L1 man-in-the-middle false base station, based on an uplink signal being received outside of the determined window of time for the arrival of uplink signals.
1. A method of wireless communication at a base station, comprising:
determining a window of time for arrival of uplink signals, wherein the window of time includes a start based on a first expected time of arrival for a first uplink signal from a first location within a cell associated with the base station and an end based on a second expected time of arrival for a second uplink signal from a second location within the cell;
receiving an uplink signal; and
detecting a false base station (FBS) based on the uplink signal being received outside of the window of time for the arrival of the uplink signals.
2. The method of claim 1 , wherein the uplink signal comprises a random access signal.
3. The method of claim 1 , wherein the uplink signal comprises a sounding reference signal (SRS).
4. The method of claim 1 , wherein the first location is at a first distance from the base station and the second location is at a second distance from the base station, and the first distance is shorter than the second distance.
5. The method of claim 4 , wherein the second distance corresponds to a cell radius.
6. The method of claim 4 , wherein the first distance corresponds to a location of the base station.
7. The method of claim 1 , further comprising:
performing a mitigation operation for at least one UE in response to detecting the FBS.
8. The method of claim 7 , wherein the mitigation operation includes handing over the at least one UE to a different cell.
9. The method of claim 7 , wherein the mitigation operation includes updating one or more communication parameters for cell selection or cell reselection to de-prioritize a cell corresponding to the FBS.
10. An apparatus for wireless communication at a base station, comprising:
a memory; and
at least one processor coupled to the memory and configured to:
determine a window of time for arrival of uplink signals, wherein the window of time includes a start based on a first expected time of arrival for a first uplink signal from a first location within a cell associated with the base station and an end based on a second expected time of arrival for a second uplink signal from a second location within the cell;
receive an uplink signal; and
detect a false base station (FBS) based on the uplink signal being received outside of the window of time for the arrival of the uplink signals.
11. The apparatus of claim 10 , wherein the first location is at a first distance from the base station and the second location is at a second distance from the base station, and the first distance is shorter than the second distance.
12. The apparatus of claim 11 , wherein the second distance corresponds to a cell radius.
13. The apparatus of claim 11 , wherein the first distance corresponds to a location of the base station.
14. The apparatus of claim 11 , wherein the at least one processor is further configured to:
perform a mitigation operation for at least one UE in response to detecting the FBS.
15. The apparatus of claim 14 , wherein the mitigation operation includes handing over the at least one UE to a different cell or updating one or more communication parameters for cell selection or cell reselection to de-prioritize a cell corresponding to the FBS.