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Why do use IMSI for calculating the Paging Frame(PF) and not S-TMSI?

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Why do use IMSI for calculating the Paging Frame(PF) and not S-TMSI?

PF= SFN mod T = (T div N ) * (UE_ID mod N)

Where UE_ID= IMSI mod 1024.

posted Aug 12, 2014 by anonymous

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1 Answer

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IMSI is more predictable number for the MME all the cases and in certain cases S-TMSI may not be there (allocated at the time of LTE-ATTACH)

answer Aug 13, 2014 by Salil Agrawal
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