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Bug #6078

closed

SI1 rest octests indicated "Band Indicator: 1900" on a 850MHz BTS

Added by laforge 8 months ago. Updated 3 months ago.

Status:
Resolved
Priority:
Normal
Assignee:
Category:
-
Target version:
-
Start date:
06/28/2023
Due date:
% Done:

100%

Spec Reference:

Description

I've configured osmo-bsc/bts with a 850MHz cell on ARFCN 136. I then try to register to it from osmocom-bb/mobile via trxcon and get:

20230628205120086 DL1C NOTICE trxcon(0)[0x61200004f720]{BCCH_CCCH}: L1CTL_DM_EST_REQ indicates single ARFCN PCS1900 136 (l1ctl.c:569)
20230628205120086 DTRXC ERROR trx_interface(0)[0x61200004f8a0]{RSP_WAIT}: ARFCN 32904 not defined (trx_if.c:321)

Some research shows that mobile will do something like "ARFCN 136 | PCS" because SI1 rest octests contains "Band Indicator: 1900" for this cell.

Irrespective of any OsmocomBB bugs, it seems wrong for osmo-bsc to encode this in SI1RO.


Related issues

Related to OsmocomBB - Bug #6079: Errors in processing ARFCNs from GSM 850 BTS, mobile asking for ARFCN 32904Resolvedjolly06/29/2023

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