RNC-Id and LAC both present in InitialUE msgs

Neels Hofmeyr nhofmeyr at sysmocom.de
Tue Apr 5 12:10:46 UTC 2016


On Tue, Apr 05, 2016 at 02:03:54PM +0200, Neels Hofmeyr wrote:
> Turns out: even though only the RNC-Id is sent in the id-Reset message,
> both the RNC-Id *and* the LAC are transmitted in an InitialUE message.

For the record, see the RANAP spec (3GPP TS 25.413 version 12.4.0 Release
12) chapter 9.1.33, which lists all of Global RNC-ID, LAI and SAI IEs as
mandatory, where both LAI and SAI include the LAC, also mandatorily.

It's interesting how LAI and SAI are mostly redundant, yet both are
mandatory.

~Neels
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