Obscuring temporary user equipment identities

摘要

Techniques for concealing temporary identifiers (IDs) assigned to user equipments (UEs) by a wireless communication system are described. At a network entity, a first ID Assigned to a UE and possibly a salt value are transformed, e.g., based on a hash function, to obtain a second ID for the UE. An output message directed to the UE is generated based on an input message, the second ID, and the salt value (if present). The output message is sent via a common channel shared by the UE and other UEs. At the UE, a message is received via the common channel, and a salt value (if sent) is obtained from the received message. The first ID and the salt value are transformed to obtain the second ID, which is used to determine whether the received message is intended for the UE.

主权项

1. An apparatus comprising:
a processor configured to transform a first identifier (ID) assigned to a user equipment (UE) to obtain a second ID for the UE using the first ID and a salt value, wherein:
the processor is further configured to obtain the second ID by hashing the first ID and the salt value,the first ID and the salt value are selected from values that are known to have no collisions among the UE and other UEs,the processor is further configured to determine that an input message is directed to the UE, wherein the determination includes:obtaining a third ID from the input message, andcomparing the second ID to the third ID to determine whether the input message is directed for the UE;the processor is further configured to generate an output message directed to the UE based on the input message, the second ID and the salt value, and to send the output message via a common channel shared by the UE and the other UEs, wherein the output message, when received by the UE, allows the UE to obtain the second ID and to compare the second ID with one or more entries of a look-up table stored at the UE, the look-up table including one or more additional second IDs obtained by hashing one or more additional first IDs with one or more additional salt values, andthe processor is further configured to change the salt value each time the first ID is transformed for the UE; and a memory coupled to the processor.