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Harald Welte gerrit-no-reply at lists.osmocom.orgHarald 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: (1 comment) https://gerrit.osmocom.org/#/c/14191/1/bts/BTS_Tests.ttcn File bts/BTS_Tests.ttcn: https://gerrit.osmocom.org/#/c/14191/1/bts/BTS_Tests.ttcn@3345 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. -- To view, visit https://gerrit.osmocom.org/14191 To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings Gerrit-Project: osmo-ttcn3-hacks Gerrit-Branch: master Gerrit-MessageType: comment Gerrit-Change-Id: I0f2c4f053ef1b8d61d565f94a548c47fe3666f16 Gerrit-Change-Number: 14191 Gerrit-PatchSet: 1 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 Gerrit-HasComments: Yes Gerrit-HasLabels: No -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/gerrit-log/attachments/20190526/11caa24e/attachment.htm>