A method of operating a position determining entity filter comprises receiving a request for location assistance data transmitted from a wireless communication device, wherein the request is associated with a source packet address and includes a user identifier, and processing the request to determine if the user identifier is associated with the source packet address. The method further comprises, if the user identifier is not associated with the source packet address, initiating a count to track a number of requests for the location assistance data transmitted from the wireless communication device, and removing data previously associated with the user identifier and the source packet address. The method further comprises, if the user identifier is associated with the source packet address, incrementing the count and determining if a flag is assigned to the user identifier, inhibiting future requests if the flag is assigned to the user identifier, and if the flag is not assigned to the user identifier, determining if the count exceeds a threshold, and if the count exceeds the threshold, assigning the flag to the user identifier.