Annex 6 - Deducing the UTRN Counter from the Truncated UTRN Counter – informative
This annex provides a worked example of the calculation described in Section 18.104.22.168.5. The calculation uses the 10-bit Truncated UTRN Counter received with the prepay top-up command is received via Consumer Entry to the Device, either directly or via a PPMID. The calculation uses the highest UTRN Counter value held in the Device’s UTRN Counter cache, and a window of 512 either side of this value in making the deduction.
In this case, the UTRN Counter being entered into the Device is 5 greater than the highest thus far received by the Device.