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http://cgit.osmocom.org/osmo-pcu/commit/?id=af75ce8e15ec8584cbc96a0cd366a5df68b9dae8
commit af75ce8e15ec8584cbc96a0cd366a5df68b9dae8
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Wed Aug 26 13:22:28 2015 +0200
l1: Use the FN of all data_ind/ra_ind DSP messages
Currently all of these messages are discarded if they are assumend to
be caused by noise. But even in these cases, the FN and TN values
which are added by the DSP are valid. So these can be used to update
the current_frame value.
The osmo-bts sets the fBFILevel of a physical channel to -200dB if it
is used for PDTCH or PACCH which is the case for all PDCH. This way
a data_ind or ra_ind message is already send at least once per block
period (4 frames) per PDCH. These messages are passed to either
handle_ph_data_ind or handle_ph_ra_ind even if they contain garbage
data.
The ra_ind messages are sometimes sent a few frames earlier than
data_ind messages using the same frame.
This commit adds calls to update the current_frame value based on all
of these messages before they are discarded. The FN taken from ra_ind
are passed with an increased max_delay (5) to compensate for early
ra_ind messages.
Sponsored-by: On-Waves ehf
http://cgit.osmocom.org/osmo-pcu/commit/?id=be4a08b58ae17b44d2c02421d8346a1ccb63a6b9
commit be4a08b58ae17b44d2c02421d8346a1ccb63a6b9
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Tue Aug 25 15:19:31 2015 +0200
poll: Count unexpected block FN values
Currently a log entry is written if FN_data_ind - FN_time_ind <= -13.
This commit adds a counter 'rlc.late-block' that is incremented in
these cases.
Sponsored-by: On-Waves ehf
http://cgit.osmocom.org/osmo-pcu/commit/?id=60f77033ad15da909cdbc0682c781151a23c170c
commit 60f77033ad15da909cdbc0682c781151a23c170c
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Mon Aug 24 14:35:14 2015 +0200
poll: Use the data_ind FN as time source for current frame
The FN of the data_ind taken from the DSP are monotonic, so latency
does not affect the detection of poll timeouts if these FN are used.
If the FN is larger than a poll_fn value, it can safely be assumed
that the poll response will not arrive later on.
Currently a max_delay of 60 frames is used, which has the drawback
that additional ~250ms will pass until a lost ACK is detected.
Using the data_ind's FN alone breaks the poll timeout detection if
there are no other MS sending data blocks.
This commit adds BTS::set_current_block_frame_number that is called
with the FN taken from data_ind messages. The max_delay is set to 0
which removes the additional delay, when this FN is used to detect
poll timeouts. So the average additional delay decreases with the
number of data_ind per time. The current_frame is updated unless it
seems to have been updated already (assumed if 0 < cur_fn - block_fn
< 500). Thus the time_ind has still priority to update the
current_frame value.
Sponsored-by: On-Waves ehf
http://cgit.osmocom.org/osmo-pcu/commit/?id=e77d49f2a2c20202dbdc5386c7dfeed4e773a077
commit e77d49f2a2c20202dbdc5386c7dfeed4e773a077
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Thu Aug 27 13:28:05 2015 +0200
poll: Set the max_delay to 60 frames
Currently the max_delay parameter is set to 13, since that is
slightly above maximum number of frames that a time_ind can preceed a
block's data_ind of the same frame. This assumes that these messages
are not reordered after thay have been obtained from the DSP. In the
current implementation, the GPRS data_ind can directly be taken from
the DSP by the PCU while the time_ind messages are provided via the
BTS. So the messages are queued differently in that case, resulting
in a additional delay of the data_ind with respect to the time_ind.
The propability for this raises with a increased CPU load of the PCU.
If this happens, a poll timeout is detected by mistake and the poll
is either retried or cleared.
This commit increases the tolerance to 60 frames, since
values for FN_data_ind - FN_time_ind of up to 50 frames have been
observed under heavy PCU load.
Sponsored-by: On-Waves ehf
http://cgit.osmocom.org/osmo-pcu/commit/?id=ac49d0943a2a384ef99cce0933cac74d80563407
commit ac49d0943a2a384ef99cce0933cac74d80563407
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Thu Aug 27 13:18:24 2015 +0200
poll: Add a max_delay parameter to PollController::expireTimedout
Currently the maximum additional delay is hard coded to 13. This
value depends on the source of the frame number value.
This commit adds the max_delay parameter to make it caller dependant.
Sponsored-by: On-Waves ehf
http://cgit.osmocom.org/osmo-pcu/commit/?id=16d29c7da4ee516b4ef0a6ec18cec18f8a76d7fa
commit 16d29c7da4ee516b4ef0a6ec18cec18f8a76d7fa
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Mon Aug 24 13:30:39 2015 +0200
tbf: Add logging for polling
This commit adds the relevant frame number to the "poll timeout"
logging message. In addition, logging is added to the places where
poll_fn gets set.
The goal is to track down the source for frequent "poll timeout"
messages.
Sponsored-by: On-Waves ehf
-----------------------------------------------------------------------
Summary of changes:
src/tbf.cpp | 103 ++++++++++++++++++++++++++++++++++++++++++----------
src/tbf.h | 14 ++++---
tests/ms/MsTest.cpp | 22 +++++------
3 files changed, 103 insertions(+), 36 deletions(-)
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