name: SQNHE
full_form: Sequence number counter maintained in the HLR/AuC
context: data request from the HE/AuC (or before it is timed out). When the HE/AuC receives an authentication data request with a "synchronisation failure indication" it acts as follows: 1. The HE/AuC retrieves SQNMS from Conc(SQNMS) by computing Conc(SQNMS) Ã f5*K(RAND). 2. The HE/AuC checks if SQNHE is in the correct range, i.e. if the next sequence number generated SQNHE using would be accepted by the USIM. 3. If SQNHE is in the correct range then the HE/AuC continues with step (6), otherwise it continues with step (4). 4. The HE/AuC verifies AUTS (cf. subsection 6.3.3). 5. If the verification is successful the HE/AuC resets the value of the counter SQNHE to SQNMS. 6. The HE/AuC sends an authentication data response with a new batch of authentication vectors to the VLR/SGSN. If the counter SQNHE was not reset then these authentication vectors can be taken from storage, otherwise they are newly generated after resetting SQNHE. In order to reduce the real-time computation burden on the
description: SQNHE is a sequence number counter maintained in the Home Location Register (HLR) or Authentication Center (AuC). It plays a crucial role in the re-synchronisation procedure, ensuring that the sequence numbers used for authentication are within an acceptable range.
explanation: The context explicitly mentions SQNHE as a counter maintained in the HLR/AuC, which is used to track and manage sequence numbers for authentication purposes. This aligns with the definition of a Parameter, as it represents a critical network attribute that affects the operation of the re-synchronisation procedure.
section_title: 6.3.5	Re-synchronisation procedure
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