Change in osmo-ttcn3-hacks[master]: bts: Add TC_pcu_data_req_pch() for testing PCU-originated PCH
gerrit-no-reply at lists.osmocom.org
Sun May 26 21:08:39 UTC 2019
Harald Welte has posted comments on this change. ( https://gerrit.osmocom.org/14191 )
Change subject: bts: Add TC_pcu_data_req_pch() for testing PCU-originated PCH
Patch Set 1:
PS1, Line 3345: c_PCU_DATA
> So that '313233'O prefix is not needed here, right? What is the purpose of it in general?
as the comment indicates a few lines above: /* three characters prefix: last 3 digits of IMSI as ASCII */
The BTS needs to know the IMSI modulo 1000 in order to compute the paging group. For some reason whoever designed that part of the PCU interface decided not to put it into a header, but rather prefix the MAC block with three ASCII bytes expressing the last three digits of the IMSI.
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Gerrit-Owner: Harald Welte <laforge at gnumonks.org>
Gerrit-Reviewer: Harald Welte <laforge at gnumonks.org>
Gerrit-Reviewer: Jenkins Builder (1000002)
Gerrit-Reviewer: Vadim Yanitskiy <axilirator at gmail.com>
Gerrit-Comment-Date: Sun, 26 May 2019 21:08:39 +0000
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