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commit 9c2bc1f28480b3487bbc34d6ba2779aff85bcc6d Author: Jacob Erlbeck jerlbeck@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=2f7228b15fd8b55c6bc0c3e203aa19cb...

commit 2f7228b15fd8b55c6bc0c3e203aa19cb41497bf6 Author: Jacob Erlbeck jerlbeck@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=e61b652e1b9f184d8cf9584b068600e9...

commit e61b652e1b9f184d8cf9584b068600e907df2347 Author: Jacob Erlbeck jerlbeck@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=53a32b8e95bed5cca800c98861458cbf...

commit 53a32b8e95bed5cca800c98861458cbfed753104 Author: Jacob Erlbeck jerlbeck@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

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Summary of changes: src/pcu_vty_functions.cpp | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

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