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- Log -----------------------------------------------------------------
http://cgit.osmocom.org/osmo-pcu/commit/?id=60d611adcea23fd28a32913aba4ac3e6774fd630
commit 60d611adcea23fd28a32913aba4ac3e6774fd630
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Fri Jun 12 10:52:34 2015 +0200
tbf: Reduce CS level if only a few LLC bytes are left (TODO)
This is an experimental commit to reduce the coding scheme level if
just a few bytes are left to send to the MS. This makes the
transmission more robust and can improve throughput and latency if
only a few small packages like TCP ACKs or ICMP PINGs are sent.
TODO:
- commit message
- make threshold configurable (at least by a macro)
- test case
http://cgit.osmocom.org/osmo-pcu/commit/?id=c0cd2ffc2b07340ffe4e788a61d31800b4866980
commit c0cd2ffc2b07340ffe4e788a61d31800b4866980
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Fri Jun 12 14:06:09 2015 +0200
tbf: Fix downlink packet loss
When the MS is pinged with a longer interval, many packets get lost
even if the GprsMs object is kept. If the interval is above the time
where the DL TBF is in state FLOW (mainly influenced be the
dl-tbf-idle-time command), an new TBF must be requested via AGCH for
each ICMP PING message.
Currently the LLC frame containing the PING is immediately stored
in the TBF and gets lost, if TBF establishment fails for some reason.
This commit moves all calls to put_frame() to schedule_next_frame(),
where the data is moved from the LLC queue to the frame storage
within the TBF object. This method is only called from within
create_new_bsn() when the TBF is in the FLOW state and the frame is
going to be encoded immediately.
At all other places, where put_frame() has been called before, the
LLC message is just appended to the LLC queue in the GprsMs object.
This change effectively simplifies the related code parts, since
date/len information and discard notifications is no longer needed
there.
Ticket: #1759
Sponsored-by: On-Waves ehf
http://cgit.osmocom.org/osmo-pcu/commit/?id=939043b385ce0c0cbc2fc7c459e3f8f660a8260c
commit 939043b385ce0c0cbc2fc7c459e3f8f660a8260c
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Fri Jun 12 13:41:00 2015 +0200
tbf/test: Add test for DL LLC packet loss
Currently LLC frames are lost or even reordered when the TBF has be
established via the AGCH and the procedure fails for some reason.
This test tries to reproduce this behaviour by throwing away the
first TBF while calling the handle() method several times. The
results of create_dl_acked_block() are checked against expected
values (this is currently party disabled because the bug still
persists).
Ticket: #1759
Sponsored-by: On-Waves ehf
http://cgit.osmocom.org/osmo-pcu/commit/?id=1e96f228d4ffd10a8b19f0c85b84d3fd5f5b7dd5
commit 1e96f228d4ffd10a8b19f0c85b84d3fd5f5b7dd5
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Fri Jun 12 16:01:56 2015 +0200
ms: Store the NACK rate in the MS object
Currently the NACK/unconfirmed ratio is already passed to the
corresponding MS object, but the value is not being stored there.
This commit adds a member and a getter method and include the values
into the output of the 'show ms' command.
Sponsored-by: On-Waves ehf
http://cgit.osmocom.org/osmo-pcu/commit/?id=6634635cf57c551538c43892de3e7eb2e10b1631
commit 6634635cf57c551538c43892de3e7eb2e10b1631
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Fri Jun 12 10:48:05 2015 +0200
tbf: Include CS into create_new_bsn log message
This change lets the test suite fail, so it get its own commit.
Sponsored-by: On-Waves ehf
http://cgit.osmocom.org/osmo-pcu/commit/?id=5823b20f2f81bff984461436e8e2512b5daa8793
commit 5823b20f2f81bff984461436e8e2512b5daa8793
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Thu Jun 11 18:09:00 2015 +0200
l1: Add debug log messages for I_LEVEL
The I_LEVEL values that are obtained now look suspicious. They do not
seem to be contained in messages recorded via gsmtab.
To help debugging this issue, this commit adds related debug messages
that are generated while the encoded values are taken from the
RLC/MAC messages.
Sponsored-by: On-Waves ehf
http://cgit.osmocom.org/osmo-pcu/commit/?id=6659c516fa32ab64642b5822bf4b880f3cc27bbb
commit 6659c516fa32ab64642b5822bf4b880f3cc27bbb
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Thu Jun 11 16:54:50 2015 +0200
l1: Store measurement values sent by the MS
This commit extends the pcu_l1_meas structure by MS side measurement
values which are transmitted by PACKET DOWNLINK ACK/NACK and
PACKET RESOURCE REQUEST messages. The encoded values are remapped to
dB respectively % values. The values are stored in the corresponding
MS object (if there is one).
Note that the values are store as (rounded) integers, so some
different encodings are mapped to the same decoded value.
Sponsored-by: On-Waves ehf
http://cgit.osmocom.org/osmo-pcu/commit/?id=54fff3b3e4cef0bf182ec7779793a252b73c48b0
commit 54fff3b3e4cef0bf182ec7779793a252b73c48b0
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Tue Jun 9 09:44:36 2015 +0200
ms: Add UL CS selection based on L1 link quality
Currently the UL CS values are set to the corresponding DL CS value,
eventually limited by a maximum value. This approach does not reflect
the general situation of the RF link between ME and BTS, which is
rather asymmetric e.g. due to a lower degree of TX efficiency of the
built-in antenna. This means, that UL and DL CS control should be
decoupled for better results.
This commit adds automatic UL CS selection based on the link quality
measurement parameter. Each coding scheme is mapped to a link quality
range. If the link quality value leaves that range, the current UL CS
value is increased/decreased accordingly. This value will be copied
when the next PACKET_UPLINK_ACK_NACK or PACKET_UPLINK_ASSIGMENT is
sent to the MS.
The following VTY command will be added to the config-pcu node:
- cs link-quality-ranges cs1 <0-35> cs2 <0-35> <0-35>
cs3 <0-35> <0-35> cs4 <0-35>
which sets the ranges for the four coding schemes. For instance the
example below reflects the current default values:
cs link-quality-ranges cs1 6 cs2 5 8 cs3 7 13 cs4 12
set the following ranges, where the overlapping is used to configure
a hysteresis:
CS1: -inf .. 6
CS2: 5 .. 8
CS3: 7 .. 13
CS4: 12 .. inf
Sponsored-by: On-Waves ehf
http://cgit.osmocom.org/osmo-pcu/commit/?id=3bea905e0d013de9a0b9d77fdc5318a133a6af9b
commit 3bea905e0d013de9a0b9d77fdc5318a133a6af9b
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Mon Jun 8 11:26:38 2015 +0200
ms: Store the L1 measurement values in the MS objects
This commits adds the GprsMs::update_l1_meas() and GprsMs::l1_meas()
methods to store and access the measurement values. The internal
state is updated depending on which values are actually set.
In addition, these values are shown in the output of the 'show ms
imsi|tlli' command.
Sponsored-by: On-Waves ehf
http://cgit.osmocom.org/osmo-pcu/commit/?id=4ff709c3aca86f9974c99b99aea3da9bfde714a3
commit 4ff709c3aca86f9974c99b99aea3da9bfde714a3
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Mon Jun 8 11:05:45 2015 +0200
l1: Pass all L1 measurements upwards
Currently only the RSSI value is passed to the upper layers. Other
values like TA and BER which are needed for TA update respectively CS
selection are not propagated.
This commit introduces and passes a struct that contains a set of
measurement values.
Sponsored-by: On-Waves ehf
-----------------------------------------------------------------------
Summary of changes:
src/bts.cpp | 72 ++++++++++++++++++++-
src/gprs_ms.cpp | 53 ++++++++++++++-
src/gprs_ms.h | 12 ++--
src/pcu_l1_if.h | 46 ++++++++++++-
src/pcu_main.cpp | 8 +--
src/pcu_vty.c | 2 +-
src/pcu_vty_functions.cpp | 19 ++++++
src/tbf.h | 3 +-
src/tbf_dl.cpp | 137 ++++++++++++++++++++-------------------
tests/tbf/TbfTest.cpp | 70 ++++++++++++++++++++
tests/tbf/TbfTest.err | 161 ++++++++++++++++++++++++++++++++++++++--------
tests/tbf/TbfTest.ok | 2 +
12 files changed, 475 insertions(+), 110 deletions(-)
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