osmo-pcu.git branch jerlbeck/flow-control updated. 0.2-415-g6eeb7c7

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- Log -----------------------------------------------------------------

commit 6eeb7c7e74ed8cc1e23b19453012f43563055e12
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date:   Wed May 6 15:26:08 2015 +0200

    bssgp: Increment BSSGP flow control tag value
    Currently the tag value in FLOW CONTROL BVC messages is always 1.
    This commit changes the implementation to increment that value with
    each of the FLOW CONTROL BVC messages that is sent to the SGSN.
    Sponsored-by: On-Waves ehf


commit 6e4ccec6c4b69681e94e4d3b27ef022e4aab81a9
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date:   Wed May 6 14:24:36 2015 +0200

    bssgp: Compute and transmit queue delay
    The specification 28.018,  allows to transmit the average LLC downlink
    queueing delay in FLOW CONTROL BVC messages (BVC Measurement IE, see
    GSM 28.018, 10.4.4 and 11.3.7).
    This commit extends gprs_bssgp_pcu.cpp to compute the average delay
    time between two subsequent FLOW CONTROL BVC messages. The average is
    implemented as an arithmetic average without any weighting.
    Ticket: OW#1432
    Sponsored-by: On-Waves ehf


commit 0288cdb0a8d4011905da55a5b74319e38e27e70d
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date:   Wed May 6 10:47:30 2015 +0200

    bssgp: Add VTY command to Limit the bucket size by time
    Currently the bucket size is by default being computed based on the
    leak rate and the expected life time of LLC frames. The latter is
    either taken from 'queue lifetime' (if given) or a fixed value is
    used. Using 'queue lifetime' has the drawback that it sets a 'hard'
    limit, since frames will be dropped if they stay in the queue
    for a longer time.
    This commit adds a VTY command to specifically set the time used for
    the computation of the bucket size advertised to the SGSN. It does
    not affect the PCUs queue handling in any way. If the bucket time is
    not set (or if the 'no' command has been used), the old behaviour
    (see above) is applied.
    The following VTY commands are added (config-pcu node):
    - flow-control bucket-time <1-65534>  Sets the time in centisecs
    - no flow-control bucket-time         Don't use this time
    Ticket: OW#1432
    Sponsored-by: On-Waves ehf


commit 3d62fc55d89fe1f2da0f0ca1950ab97da7e07418
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date:   Thu Apr 30 15:01:15 2015 +0200

    bssgp: Compute BVC bucket size and leak rate
    Currently the PDCH assignment and coding scheme does not influence
    the values transmitted by the FLOW-CONTROL-BVC messages.
    This commit adds the computation of those values. If the leak rate is
    not given explicitly, it is derived from the number of PDCH and the
    allowed coding scheme. If the BVC bucket size is not given
    explicitly, it is derived from the leak rate and the maximum buffer time.
    The latter is taken from the 'queue lifetime' command (or 10s if this
    has not been used). The MS default bucket size is set to 50% of the
    BVC bucket size. The MS default rate computation assumes, that each MS
    only supports up to 4 time slots for GPRS RX.
    Sponsored-by: On-Waves ehf


commit 87d7341fbe290582ac4a03f67349496e5306eb04
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date:   Tue Apr 21 12:56:48 2015 +0200

    bssgp: Make BVC bucket size / leak rate configurable
    Currently the FLOW-CONTROL_BVC message contains fixed values: The tag
    is 1, the BVC bucket size is 6MB, the BVC bucket leak rate is
    820kbit/s, the MS bucket size is 50kB, and the MS leak rate is
    This commit makes the BVC parameters configurable and adds the
    following VTY commands:
    - flow-control force-bvc-bucket-size <1-6553500>
    - no flow-control force-bvc-bucket-size
    - flow-control force-bvc-leak-rate <1-6553500>
    - no flow-control force-bvc-leak-rate
    - flow-control force-ms-bucket-size <1-6553500>
    - no flow-control force-ms-bucket-size
    - flow-control force-ms-leak-rate <1-6553500>
    - no flow-control force-ms-leak-rate
    The 'no' variants restore the default behaviour.
    Sponsored-by: On-Waves ehf


commit 29d91e92715945f53aff4530602add765d63946e
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date:   Wed Apr 29 14:46:52 2015 +0200

    tbf: Added calls to llc_dropped_frame
    Currently this function which increments the corresponding counter is
    just called in gprs_llc::clear(). It is not called on places where
    LLC DISCARDED messages are sent.
    This commit adds calls to llc_dropped_frame() at these places.
    Sponsored-by: On-Waves ehf


Summary of changes:
 src/bts.h              |   1 +
 src/gprs_bssgp_pcu.cpp | 162 +++++++++++++++++++++++++++++++++++++------------
 src/gprs_bssgp_pcu.h   |   8 +++
 src/pcu_vty.c          |  28 +++++++++
 src/tbf_dl.cpp         |  16 +++--
 5 files changed, 171 insertions(+), 44 deletions(-)


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