The VTY handover_vtc.c offers a large number of handover specific
settings. Those settings are (with one exception) auto generated using
macros. Lets add an equivalent for the control interface that uses the
same auto generation mechanisms.
Change-Id: I12f143906818fd6b16e8783157cbb1eb51e49ffc
Depends: libosmocore I53fc207677f52b1dc748b01d58424839cdba807c
Related: SYS#5369
Clarify that filling half-used TCH/H first only happens on dynamic
timeslots, not static ones.
Related: SYS#5313
Change-Id: I5213459fb7fb201361ce0d6198fc0c2c745deee1
In a discussion about the effect of interference levels, I noticed that
there is not sufficient clarity about how strongly the preference of
static timeslots is ranked. This test helps to show what we have.
Related: SYS#5313
Change-Id: I0911cd74613045d9fbe29d04eaef036d32049b92
The VTY defun already indicates BSC_VTY_ATTR_RESTART_ABIS_OML_LINK
correctly, but so far we would immediately start using the new values
internally, and wrongly interpret interference levels. Fix that.
Have bts->interf_meas_params twice: interf_meas_params_cfg for the VTY
configured values, and interf_meas_params_used for the values that the
BTS actually knows about, after they were sent via OML.
In a running BSC, when changing the interference level boundaries on the
telnet VTY, the BTS is not immediately told about the change. That would
require a BTS restart. Hence store the cfg values separately in
interf_meas_params_cfg. For comparing/printing interference levels in a
running BTS, only employ the values that were actually sent via OML and
placed in interf_meas_params_used.
Related: SYS#5313
Change-Id: Iad8cf4151ff7f86dc0549158ed5d91d788d40b1f
Hold off re-assignment after an intra-cell re-assignment due to low
rxqual.
Adjust test_amr_tch_h_to_f_rxqual.ho_vty to show the changed behaviour.
Related: SYS#5198
Change-Id: Id00a07313fe04eec509b336c0637b59c707760e0
First add a handover test script that shows the behavior without the
low-rxqual-assignment penalty timer implemented. When implemented, the
changes to this test script will show the change in behavior.
Related: SYS#5198
Change-Id: I799fce709c86401546ccfe41b9f57fd579bcd987
With recent addition of fake time in handover_test ('wait cmd'), show
how a penalty timeout in handover decision 2 passes and allows a
handover again after due time.
Related: SYS#5198
Change-Id: I65e59cc7309778cf9d71612669ce84d101c8135e
Use recently added fake-time 'wait' command to show how the lchan in
LCHAN_ST_WAIT_AFTER_ERROR recovers as soon as timer X3111 has passed.
This prepares for also waiting for the penalty timeout to pass.
Related: SYS#5198
Change-Id: I8f7668b6d08a0dac9e90d2358955f9d5099d39fa
Add a 'wait' cmd that lets (fake) time pass.
An ucoming patch will show the
first use of this: "test_penalty_timer.ho_vty: show lchan recovery"
I8f7668b6d08a0dac9e90d2358955f9d5099d39fa
My actual original reason to add this follows in patches
- "handover tests: test passing of penalty timeout"
I65e59cc7309778cf9d71612669ce84d101c8135e
- "hodec2: add low-rxqual-assignment penalty timer (2/2)"
Id00a07313fe04eec509b336c0637b59c707760e0
Related: SYS#5198
Change-Id: Ia6b5696adef7e7bf649473b4d79b96acf3aa59e3
In expect-ts-use, indicate a busy lchan with letter '!'.
The code is a bit complex because of the choice made earlier to show two
TCH/H subslots as "TCH/HH", "TCH/H-" or "TCH/-H" depending on the
subslot states:
- show "-" as a shorthand for "all subslots UNUSED"
- show a "TCH/" prefix only when there is any "H" or "F" following, i.e.
when any subslot is actually established
- if a subslot is busy (any other state besides ESTABLISHED and UNUSED),
indicate the subslot as '!'.
The spectrum of reported state strings for TCH/F is:
TCH/F ! -
For TCH/H:
TCH/HH TCH/H- TCH/-H TCH/H! TCH/!H !- -! -
The only current test affected is test_penalty_timer.ho_vty, where a
failed handover leaves an lchan in LCHAN_ST_WAIT_AFTER_ERROR. Adjust
that test.
Rationale: I will soon add tests to verify the accurate timeout of a
handover2 penalty timer. While implementing, I noticed that immediate
retry of the handover ends up in timeslot 2, because timeslot 1 is still
in WAIT_AFTER_ERROR. Instead of working around that, I would like to
explicitly show the error state in the test -- it is an important
aspect.
Related: SYS#5198
Change-Id: I735ce7e2c3e0e450d3f76047d7e47691fe889cad
Fix for:
handover_test.c: In function 'res_ind':
handover_test.c:1094:30: error: 'ts_str' may be used uninitialized in this function [-Werror=maybe-uninitialized]
char subslot_val = ts_str[lchan->nr];
Fixes: f76424 ("RES IND: add test_resource_indication.ho_vty")
Change-Id: I398ba24b945bad96896eeb5ddbaff9c48bacf8ab
In lchan_select, do not return on the first available lchan, but iterate
through all available lchans. Among those that would match, pick the one
with the lowest interference level as indicated by earlier RES IND.
Lchans that have no interference ratings are picked last.
This feature is off by default, enable per BTS with
network
bts N
channel allocator avoid-interference 1
osmo-bsc still does the same ascending/descending lchan allocation as
before this patch with the default setting of:
channel allocator avoid-interference 0
Related: SYS#5313
Change-Id: I844494092193811dfd9fa4d52983cbaed0fc9248
Show that osmo-bsc does not yet take Resource Indication's reported
interference levels into account. (An upcoming patch will change that.)
This test is not actually doing any handover, but it is using the
handover/*.ho_vty scripting that was intended for handover testing.
(Like test_dyn_ts_favor_half_used_tch_h_as_target.ho_vty does.)
Related: SYS#5313
Change-Id: I56ec61196a1e103f0b4caf18d25d8222bb82cf87
Store the config option whether the channel allocator should try to
avoid lchans with higher interference levels reported in RES IND.
The actual implementation of avoiding interference follows in
I844494092193811dfd9fa4d52983cbaed0fc9248
Related: SYS#5313
Change-Id: I8b62d0b41ad9e908b27713db9219e3dbc1ebaab7
Add TDMA_MEAS_SET_AUTO to indicate automatic choice between FULL and
SUBSET measurements depending on DTX. So far use only in hodec2.
TDMA_MEAS_SET_AUTO looks at each individual measurement report's DTX
flag and for each report chooses FULL if DTX is not used, or SUB if DTX
is used.
The default setting for 'handover2 tdma-measurement' is still 'subset'.
To use the automatic choice, users need configure
handover2 tdma-measurement auto
Change-Id: I67dce55ccf892c8679272ee5dfedc25620f0f725
They will gain support to be activated as SDCCH/8 soon too.
Related: OS#5309
Depends: libosmocore.git I56dcfe4d17899630b17f80145c3ced72f1e91e68
Change-Id: Id5b89fe589a52ff88486435ac43809edb4b80f98
The BCCH carrier (sometimes called C0) of a BTS shall maintain
discontinuous Downlink transmission at full power in order to
stay 'visible' to the mobile stations. Because of that, early
versions of 3GPP TS 45.008 prohibited BS power reduction on C0.
However, starting from version 13.0.0 (2015-11) there is a feature
called 'BCCH carrier power reduction operation'. This is a special
mode of operation, where the variation of RF level for some
timeslots is relaxed for the purpose of energy saving.
In BCCH carrier power reduction operation, for timeslots on the
C0 carrier, except timeslots carrying BCCH/CCCH, the output power
may be lower than the output power used for timeslots carrying
BCCH/CCCH. In this case the maximum allowed difference in output
power actually transmitted by the BTS is 6 dB.
Introduce a VTY command to turn on and off the BCCH carrier power
reduction operation. Also introduce a CTRL command. On the
A-bis/RSL, abuse the BS POWER CONTROL message by setting
the Channel Number IE to 0x80 (RSL_CHAN_BCCH).
Currently, only osmo-bts-trx is supported. A value greater than
zero makes it reduce the power on *inactive* timeslots of the
BCCH carrier. Sending zero disables the BCCH power reduction
mode completely.
For more details, see 3GPP TS 45.008, section 7.1, and 3GPP TR 45.926.
Change-Id: I047fce33d4d3e4c569dd006ba17858467a2f4783
Related: SYS#4919
The constant is called OSMO_NRI_BITLEN_DEFAULT, NRI_BITLEN_DEFAULT does
not exist and got rendered as "NRI_BITLEN_DEFAULT" in the vty doc.
Add missing vty test for 'nri bitlen'.
Change-Id: I8af840a4589f47eaca6bf10e37e0859f9ae53dfa
The AFS bias actually should not apply to local cell lchans, because it
makes no sense for intra-cell considerations:
- same-cell lchans obviously have identical rxlev;
- any nonzero AFS bias thus always raises the TCH/F above the TCH/H;
- for intra-cell reassignment, the power budget hysteresis is,
naturally, not applied.
So, before this patch, setting AFS bias even to only 1 would
unconditionally move all (AMR) TCH/H lchans over to free TCH/F lchans in
the same cell.
Recent patch Id40d1cf8b58410c7d4eb87407fe8b8106e352438 implements
explicit upgrade from TCH/H to TCH/F *if* the TCH/H is experiencing low
rxqual or low rxlev, as a proper replacement for intra-cell AFS bias.
Related: SYS#5198 SYS#5365
Change-Id: I315f24123ae016887ab91666870ce252e096f90f
Pass flag into find_alternative_lchan() indicating that a TCH/H channel
has low ratings (rxqual or rxlev, doesn't matter).
Heed this flag in the last round, the requirement A check, and allow
candidates that have equal rxlev, if they result in an upgrade from
TCH/H to TCH/F. This allows intra-cell upgrades to TCH/F.
An important point is that this patch allows upgrade to TCH/F *without*
the AFS bias setting. See also I315f24123ae016887ab91666870ce252e096f90f.
Related: SYS#5198 SYS#5365
Change-Id: Id40d1cf8b58410c7d4eb87407fe8b8106e352438
Add VTY command to trigger an intra-cell re-assignment, also allowing to
re-assign to a secondary VAMOS lchan.
Related: SYS#5315 OS#4940
Change-Id: If006f5caaf83b07675f57e5665cfa79328da55e6
Add the Osmocom-specific extension to indicate VAMOS shadow lchans in
RSL, in lchan lookup and RSL message transmission.
Note that RR messages containing cbits (Assignment Command, Handover
Command, ...) must *not* send Osmocom specific cbits to the MS. Only the
RSL messages directed to the BTS send Osmocom specific bits.
Related: SYS#5315 OS#4940
Depends: If33c1695922d110c0d2c60d5c0136caf2587194e (libosmocore)
Change-Id: I957eff0d2c33ec795eda75a4bff21965b0179f73
It's bad to abort the program for an incompatible chan_nr. Instead of
OSMO_ASSERT(), make sure that error handling happens all they way to the
original callers of gsm_lchan2chan_nr etc.
This is also preparation to add further error causes: Osmocom specific
cbits needed for a non-Osmo BTS.
Related: SYS#5315 OS#4940
Change-Id: I71ed6437c403a3f9336e17a94b4948fca295d853
A subsequent patch will add to this VTY command, so let's first test the
current status as a baseline.
Change-Id: I6379e306fb8fa6ec227125c6cf14893d674e7596
This fixes handover oscillation in the presence of power reduction on
the downlink: apply the reduced power to the cell's RXLEV in order to
not rate the current cell as weaker than it actually is.
Related: SYS#5339
Change-Id: Ifcf59964b5e2d550d79e4ba14d90962808f79dae
According to 3GPP TS 45.008, the BSS shall monitor the levels of
interference on its IDLE traffic channels. The actual measurements
are performed in the BTS and then reported to the BSC over the
A-bis/RSL link(s) in RF RESource INDication messages.
3GPP TS 45.008 defines the following measurement parameters:
* Intave: Interference Averaging period (see table A.1),
* Interference level Boundaries (see table A.1).
Both parameters are sent to the BTS over the A-bis/OML, and can
now be configured via the VTY interface. Only those BTS models
which 'speak' the OML protocol defined in 3GPP TS 52.021 will
actually get the configured parameters, others will keep using
the hard-coded parameters.
Change-Id: I99ebf57aac1f3ca7e0497c3b4f6b0738c6ed7e47
Related: SYS#5313, OS#1866
This code is available in libosmocore since ~3 years ago
(fdf8b7b1beeb0cda262c5fb060a933aa7edb5e9a). Let's use it instead of
maintaining duplicated code which diverges over time.
Depends: osmo-bsc.git Iae058c35506bc25c9f4790889b89ac46aea664b6
(contains cherry-pick of bug fixed in osmo-bsc.git).
Change-Id: I53ad3067623077b6a8737c2a0aecc8b46bf71a15
So far we have a couple of macros iterating a specific number of lchans,
depending on dynamic timeslot state etc. With addition of VAMOS lchans,
this would become more complex and bloated.
Instead of separate iteration macros for each situation, only have one
that takes a number of lchans as argument. That allows to more clearly
pick the number of lchans, especially for non-trivial VAMOS scenarios.
Related: SYS#5315 OS#4940
Change-Id: Ib2c6baf73a81ba371143ba5adc912aef6f79238d
So far the number of usable lchans is determined on-the-fly by the
physical channel config. With VAMOS, this becomes more complex, namely
determining whether the BTS is vamos capable.
Instead of calling a function to determine the number of lchans for
every use, rather place the number of valid lchans in int members of the
timeslot struct, and initialize those during timeslot setup.
Actual use of these new fields will follow in a subsequent patch, which
introduces the ts_for_n_lchans() macro to replace current lchan
iteration macros.
Related: SYS#5315 OS#4940
Change-Id: I08027d79db71a23e874b729c4e6173b0f269ee4f
Prepare for VAMOS, where there will be secondary "shadow" lchans serving
secondary MS on the same timeslots. For those, RSL messages will need to
reflect a different stream ID aka TEI, via an rsl_link_vamos.
Make sure that every code path that sends an RSL message for a specific
lchan selects the RSL link via the new function rsl_chan_link(). When
VAMOS is implemented, this function can select the proper RSL stream.
Rename gsm_bts_trx.rsl_link to rsl_link_primary. This makes sure I'm not
missing any uses of the RSL link, and clarifies the code.
Related: SYS#5315 OS#4940
Change-Id: Ifbf16bb296e91f151d19e15e39f5c953ad77ff17
So far we do all channel reassignments by Handover Command. Since
osmo-bsc now supports rassignment of ongoing voice calls, do intra-cell
congestion resolution by Assignment Command.
In effect, add support for expecting an Assignment Command in
handover_test, and expect assignments instead of handovers for
intra-cell congestion resolution test cases.
Related: SYS#5330 OS#3277
Change-Id: Id56a890106b93fcee67ac9401b890e7b63bba421
Firstly, do not store the encoded AMR length-value bits in gsm_lchan->*
before an activation/modify has actually succeeded.
And secondly, do not store the AMR LV structure in struct gsm_lchan at
all, but only generate the TLV exactly when a message is being composed.
In gsm48_multirate_config(), generate the LV directly to a msgb instead
of a static buffer first. gsm0408_test.c expected output verifies that
the generated LV bytes remain unchanged.
In lchan_mr_config(), introduce a target mr_conf argument, so that Chan
Act and Mode Modify may generate the filtered AMR config to different
locations (lchan->{activate,modify}.mr_conf_filtered).
Only after receiving an ACK for Activate/Modify, set
lchan->current_mr_conf from lchan->{activate,modify}.mr_conf_filtered.
Use the properly scoped lchan->activate.mr_conf_filtered for Chan Act,
lchan->modify.mr_conf_filtered for Mode Modify and
new_lchan->current_mr_conf for Handover Command as appropriate.
Related: SYS#5315 OS#4940 OS#3787 OS#3833
Change-Id: Ie57f9d0e3912632903d9740291225bfd1634ed47
I noticed during testing that an lchan used as TCH/F in fact still had
its channel mode set to Signalling -- because on Assignment, the Speech
mode used to be placed in the *previous* lchan and the new lchan was
never updated after the Activ ACK. This is unbearable confusion which I
complained about numerous times, so far mostly for cosmetic reasons. But
implementing re-assignment properly actually requires this to be cleaned
up.
Keep all volatile chan mode settings in lchan->activate.* or
lchan->modify.*, and only update lchan->* members when an ACK has been
received for those settings. So a failed request keeps a sane state.
Make sure that those settings are in fact updated in the proper lchan,
upon an ACK, so that subsequent re-assignment or mode-modify know the
accurate lchan state.
Related are upcoming patches that sort out the AMR multirate
configuration in a similar fashion, see
Iebac2dc26412d877e5364f90d6f2ed7a7952351e
Ia7519d2fa9e7f0b61b222d27d077bde4660c40b9
Ie57f9d0e3912632903d9740291225bfd1634ed47.
Related: SYS#5315 OS#4940 OS#3787 OS#3833
Change-Id: Ie0da36124d73efc28a8809b63d7c96e2167fc412
Shows a bug / missing feature, to be fixed in
Ifcf59964b5e2d550d79e4ba14d90962808f79dae
Related: SYS#5339
Change-Id: I1cc9bc39e8695faa983819b909e0ec76f0dbc296
Subsequent patch will add a test that uses this to show a handover
oscillation problem in the presence of nonzero BS Power.
Related: SYS#5339
Change-Id: I158d4b27370ab19318f83018803853f423c89b79
In osmo-bsc, gsm48_multirate_config() is used in a way where the struct
amr_mode *modes always points at the full set of configured modes, and
only the AMR bits m4_75 thru m12_2 are unset to filter the used modes.
In the current test, the bits are unset to filter, but also the struct
amr_mode *modes is reduced accordingly. Instead, keep the modes fully
populated and unset only bits, like osmo-bsc does in practice.
The test results should not (and do not) differ.
Change-Id: I545de6fb66a4b74a3f08899795b4b4d9c4538f58
Philipp Maier
Neels Hofmeyr
Oliver Smith
Pau Espin
Vadim Yanitskiy