osmo-pcu.git branch master updated. 0.2-890-g1275a3f

gitosis at osmocom.org gitosis at osmocom.org
Sun Mar 5 12:24:12 UTC 2017


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      from  a01e2ee177d42bdbeaea00f28bcdd65bc27f96e2 (commit)

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http://cgit.osmocom.org/osmo-pcu/commit/?id=1275a3f91a744e011b0dba82b09124d249c7abb5

commit 1275a3f91a744e011b0dba82b09124d249c7abb5
Author: Philipp Maier <pmaier at sysmocom.de>
Date:   Tue Feb 21 19:35:23 2017 +0100

    BTS: Convert relative frame numbers to absolute frame numbers
    
    The implementation of the method rcv_rach() in class BTS, restores
    the absolute frame number of the incoming RACH-Request by using
    the relative frame number (RFn = Fn mod 42432) from the rach
    request and the already known internal absolute frame number
    m_cur_fn, which is continusly updated by the CCU interface.
    
    In some rare cases, a RACH request might be received by the BTS,
    a very short time before the frame number wraps in its 42432.
    Depending on the PCU location, RACH request might be received
    by the BSC, which forwards it to the PCU. It is then likely
    that, while the RACH request is being forwarded to the PCU, the
    PCU internal absolute frame number wraps before the RACH
    can be processed. The relative frame number from the rach
    request would then be interpreted as if it were received after
    the wrapping of the internal frame number modulos.
    
    This commit adds logic to detect and resolve this race condition.
    Also a unit test is added to check some cornercases.
    
    Change-Id: I74f00c11e5739d49f370ce6c357149e81d9aa759

-----------------------------------------------------------------------

Summary of changes:
 src/bts.cpp         |  71 ++++++++++++++++-----
 src/bts.h           |   2 +
 tests/Makefile.am   |  13 +++-
 tests/fn/FnTest.cpp | 175 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/fn/FnTest.ok  |  50 +++++++++++++++
 tests/testsuite.at  |   6 ++
 6 files changed, 301 insertions(+), 16 deletions(-)
 create mode 100644 tests/fn/FnTest.cpp
 create mode 100644 tests/fn/FnTest.ok


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