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When an internal handover is done the specification demands to inform
the MSC about the event.
- Add sending of BSSMAP HANDOVER PERFORMED msg.
Change-Id: If26e5807280e0f75a423b3b04f8e3c698c82a351
Depends: libosmocore I825106858bd89afc9837811b8fed2e8accc82441
Related: OS#3645
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gscon_release_lchans stub is added to gsm0408_test.c to make linker
happy.
Change-Id: I1743f9d5cd0fdbc0fb9afe7bcc0271c897915210
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3GPP TS 04.08 V7.21.0, section "9.1.34 System information type 2ter"
states:
"""
This message has a L2 pseudo length of 18. This message may be sent
by the network with either a L2 pseudo length of 18 or some other
value. A mobile station that does not ignore this message shall not
discard the message due to a received L2 pseudo length different
from 18.
"""
Change-Id: I45cb217ebdf89b82b0f37f38eef7a1e3a651f541
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3GPP TS 04.08 V7.21.0, section "9.1.33 System information type 2bis"
states: "This message has a L2 pseudo length of 21.".
Change-Id: I623c64c446c0973e939e9f1cba0a4d4d2f4f7237
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If an lchan is being released and had a SACCH active, there is no reason to
omit the Deact SACCH message ever. All of the callers that passed
do_deact_sacch = false did so for no good reason.
Drop the do_deact_sacch flag everywhere and, when the lchan type matches and
SAPI[0] is still active, simply always send a Deact SACCH message.
The do_deact_sacch flag was carried over from legacy code, by me, mainly
because I never really understood why it was there. I do hope I'm correct now,
asserting that having this flag makes no sense.
Change-Id: Id3301df059582da2377ef82feae554e94fa42035
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After commit [1], the code makes sure to disassociate lchan and conn before
invoking the lchan release. However, we only send RR Release if a conn is
present, which clearly is nonsense after [1].
[1] commit 8b818a01b00ea3daad4ad58c162ac52b4f08a5cb
"subscr conn: properly forget lchan before release"
Change-Id: I4fd582b41ba4599af704d670af83651d2450b1db
Manage sending of RR Release via a flag, set during invoking lchan release.
Add do_rr_release arg to lchan_release(), gscon_release_lchans(). In
lchan_fsm.c, send RR Release only if do_rr_release was passed true; do not care
whether a conn is still associated (because it won't ever be since [1]).
That way we can intelligently decide what release process makes sense (whether
the lchan terminates the subscriber connection or whether the connection goes
on at another lchan), and still disassociate lchan and conn early.
BTW, this problem wasn't caught by the stock OsmoBSC TTCN3 tests, because the
f_expect_chan_rel() don't care whether an RR Release happens or not. This is
being fixed by Ibc64058f1e214bea585f4e8dcb66f3df8ead3845.
So far this patch should fix BSC_Tests_LCLS.TC_lcls_connect_clear.
Related: OS#3413
Change-Id: I666b3b4f45706d898d664d380bd0fd2b018be358
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Change-Id: Ib34c8e3fb51d067581aefa1c80f8be1f6db9512e
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These indicators are a legacy of early handover_decision_2.c work, where there
were no separate handover1 and handover2 config commands. No need to restate
the abundantly obvious anymore.
Change-Id: Id4d29542f7dd5bd125d6f10c7783569f13092612
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The commit acd29192deed0e1a243b35278b030bde7b1662b5
Change-Id Ifb9212fede2333ad68db94188b5cda4fcabe02f8
introduced a bad change to neighbor_ident.vty. Revert that bit.
Change-Id: I8b80be6daef73f5864ba9f294bf2134c8a76ddb5
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During the generation of the multirate configuration IE in the channel
activation message that is sent over RSL, all AMR rates except the
highest one are trimmed. This was to ensure that the multirate
configuration IE only contains one codec rate per active set. Lets fix
that and generate a proper IE with threshold and hysteresis values.
- extend lchan_mr_config so that it can generate a full multirate
configuration IE
Change-Id: I7f9f8e8d9e2724cbe3ce2f3599bc0e5185fd8453
Related: OS#3529
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The function gsm48_multirate_config() generates the multirate
configuration IE, that is sent via RSL to configure the active set of
AMR codecs inside the BTS. The function already works, but it does not
check the input data for consistancy. Lets add some consistancy check to
make sure that inconsistant parameters are rejected. Also allow the
output pointer to be NULL, so that the function can be used to perform
a dry run to be able to verify parameters.
- Check for invalid / inconsistant configuration parameters
- Perform a dry-run when lv pointer is set to NULL
Change-Id: I06beb7dd7236c81c3a91af4d09c31891f4b910a4
Related: OS#3529
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I believe I have initially misinterpreted the idea behind sending a Cell
Identifier List in BSSMAP Handover Required messages. Instead of associating N
Cell Identifiers with one ARFCN+BSIC, the idea is to add up N separate
ARFCN+BSIC's Cell Identifiers into a list. To keep the door open for future
code simplification, make sure to allow only one Cell Identifier per remote
ARFCN+BSIC on the VTY UI.
Related: OS#3656
Change-Id: Ifb9212fede2333ad68db94188b5cda4fcabe02f8
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At the moment codec_pref only checks the codec configuration, but it
does not check if there is actually a matching physical channel
available. This should be checked too we must make sure that the codec
we select fits the physical channels available on the BTS.
Change-Id: I2d29dfed450e5ef93c26ed5ec9fdc0730eb3d7dd
Related: OS#3503
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Opposed to all other codecs that are common in GSM, AMR requires a codec
configuration that is expressed by a bitmask (S0 to S15) in the speech
codec list in the ASSIGNMENT REQUEST. Also the BSC acknowledges those
configuration in the ASSIGNMENT COMPLETE message.
At the moment osmo-bsc ignores all incoming configuration bits. The bits
in the ASSIGNMENT COMPLETE speech codec (choosen) field are hardcoded.
- Store the configuration bits while parsing the ASSIGNMENT COMPLETE
- Create an intersection with the configuration that is actually
supported by the BSS
- Return the resulting (chosen) configuration bits with the assignment
complete message.
- Use the (highest of the) agreed codec rates in RSL channel activation.
Change-Id: I2d8ded51b3eb4c003fe2da6f2d6f48d001b73737
Related: OS#3529
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Change-Id: I35783f9624eacbdffccdb59a0179ffda54a26990
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Add missing item in the landscape of VTY commands: allow identifying a local
cell by CGI (besides BTS nr, LAC or LAC+CI, which already exist).
Change-Id: I2d03de6b695904c4a86025bf250358d04f6e47de
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Now the scheme nicely matches:
bts 0
neighbor bts 1
no neighbor bts 1
Change-Id: Ib6015b8b48c1f6b98a02cb5a68e568083466e0d5
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When writing the neighbor configuration documentation, I noticed that 'neighbor
add' and 'neighbor del' make sense from an interactive VTY POV, but when
looking at a static config file, it makes more sense to simply name the
neighbors without the 'add' keyword, and to use the 'no' prefix instead of the
'del' keyword. It still makes sense to tweak cosmetics like this before
inter-bsc handover is used anywhere.
First, remove 'add' from all 'neighbor add ...' commands.
Instead, prepend "Add" to the doc string for the cell identification argument
in commands that add a neighbor:
-OsmoBSC(config-net-bts)# neighbor add ?
- bts Neighbor cell by local BTS number
+OsmoBSC(config-net-bts)# neighbor ?
+ bts Add Neighbor cell by local BTS number
(A subsequent patch will rename 'neighbor del' to 'no neighbor'.)
Change-Id: I143f21f6069d1a86096cc8240cf69eb7ea9c8ac8
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Change-Id: I83a2b03c6a081c4ed3225d79d342913a261d9c1c
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Change-Id: I8cb165890ed77bea8ae82f5228828fa19ff7e0b9
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The COMPLETE LAYER 3 INFORMATION message lacks the Codec List (BSS Supported)
information element. This information element is mandatory for networks
that use an IP based user plane (AoIP).
- Add function to generate the speech codec list from the current codec
settings (Available codecs)
- Generate and embed information element in L3 Compl. message
Depends: libosmocore I4e656731b16621736c7a2f4e64d9ce63b1064e98
Change-Id: Id6f2af3fdab45bf05f06aec03e222734d7a4cf70
Related: OS#3548
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The the function make_scl_config() is used to generate realistically
looking speech codec lists to perform the unit tests for codec_pref.c.
This function does not yet populate the S0-S15 bits for AMR codecs. Lets
make sure that at least the default configuration is populated here.
Change-Id: I534239416c038ea856c128659f314aa521f85c15
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In the 'lac-ci' and 'cgi' neighbor identity VTY parameters, fix the CI part to
<0-65535>.
Use 65535 as CI in the neighbor_ident.vty test to verify the range.
Change-Id: Ie93bfe176b9d2d9445966e4ab0b928b9aa62a77f
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See also I91922f557072d0fb8cfe213a8a7b50f3bb23dea0, which renames
osmo_bsc_api.c to gsm_08_08.c.
Change-Id: I7179eb27183ee213f8fc8d548895b67aa43dc6a2
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Remove as much as possible from bsc_api.h. Use '#pragma once'. Tweak head
comment.
BSC_API_CONN_POL_{ACCEPT,REJECT}: only user is static complete_layer3(), just
use a bool return value instead.
msc_connected(): only used in osmo_bsc_api.c, make static there.
Instead of including gsm_data.h, declare structs opaquely, include stdint.h.
codec_pref_test.c used this as indirect gsm_data.h include via osmo_bsc.h,
include gsm_data.h there directly.
osmo_bsc.h: instead of including bsc_api.h, declare opaque structs.
gsm_04_08_rr.h: declare opaque structs to replace indirect include of
gsm_data.h.
Change-Id: Ia9c0f9828317236048e40ec9ecf9990592e2190a
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gsm0808_page() is just a thin wrapper for rsl_paging_cmd(), the only caller is
page_ms() from paging.c. Directly call rsl_paging_cmd() instead.
Move gsm0808_cipher_mode() to the only caller in osmo_bsc_bssap.c, make static.
Change-Id: Ib7ce026b52d4ba3e53a8b2824e74ea92432c48c5
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Change-Id: Ie889b8860a4a63c7c22ef65025f690d64cd7330c
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Change-Id: Id7a4407d9b63be05ce63f5f2768b7d7e3d5c86fb
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Before this patch, the timeslot FSM receives OML and RSL ready events.
Afterwards, it relies on examining the RSL and OML status to match the received
events. This doesn't work for the ip.access nanobts, which fails to change the
CHANNEL OM's operational status even though it has sent an Opstart ACK. We
receive OML CHANNEL Opstart ACK, but the mo's state left at OP_STATE=Disabled.
We apparently cannot rely on the gsm_abis_mo state as assumed before this
patch, since changing the state depends on each BTS vendor's OML
implementation.
Also, implementation wise, it is better to not include assumptions on RSL and
OML implementations in the timeslot FSM. Simply receive the OML and RSL ready
events and remember that they arrived in dedicated flags.
Remove the no longer needed oml_is_ts_ready() callback from struct
gsm_bts_model added in:
commit 91aa68f762218906e45be4817c6ea54b480da5e1
"dyn TS: init only when both RSL and the Channel OM are established"
I99f29d2ba079f6f4b77f0af12d9784588d2f56b3
This keeps osmo-bts operational while fixing ip.access nanobts, where the
CHANNEL OM's state prevented the timeslot FSM from entering operation.
Change-Id: I4843d03b3237cdcca0ad2041ef6895ff253d8419
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Add FSMs:
- timeslot_fsm: handle dynamic timeslots and OML+RSL availability.
- lchan_fsm: handle an individual lchan activation, RTP stream and release,
signal the appropriate calling FSMs on success, failure, release.
- mgw_endpoint_fsm: handle one entire endpoint with several CI.
- assignment_fsm: BSSMAP Assignment Request.
- handover_fsm: all of intra, inter-MO and inter-MT handover.
Above FSMs absorb large parts of the gscon FSM. The gscon FSM was surpassing
the maximum amount events (32), and it is more logical to treat assignment,
handover and MGW procedures in separate FSMs.
- Add logging macros for each FSM type:
- LOG_TS()
- LOG_LCHAN()
- LOG_MGWEP(), LOG_CI()
- LOG_ASSIGNMENT()
- LOG_HO()
These log with the osmo_fsm_inst where present.
New style decision: logging without a final newline char is awkward,
especially for gsmtap logging and when other logs interleave LOGPC() calls;
we have various cases where the final \n goes missing, and also this invokes
the log category checking N times instead of once.
So I decided to make these macros *always* append a newline, but only if
there is no final newline yet. I hope that the compiler optimizes the
strlen() of the constant format strings away. Thus I can log with or without
typing "\n" and always get an \n termination anyway.
General:
- replace osmo_timers, state enums and program-wide osmo_signal_dispatch()
with dedicated FSM timeouts, states and events.
- introduce a common way to handle Tnnn timers: gsm_timers.h/.c: struct T_def.
These can be used (with some macro magic) to define a state's timeout once,
and not make mistakes for each osmo_fsm_inst_state_chg().
Details:
bsc_subscr_conn_fsm.c:
- move most states of this FSM to lchan_fsm, assignment_fsm, handover_fsm and
mgw_endpoint_fsm.
- There is exactly one state for an ongoing Assignment, with all details
handled in conn->assignment.fi. The state relies on the assignment_fsm's
timeout.
- There is one state for an ongoing Handover; except for an incoming Handover
from a remote BSS, the gscon remains in ST_INIT until the new lchan and conn
are both established.
- move bssmap_add_lcls_status() to osmo_bsc_lcls.c
abis_rsl.c:
- move all dynamic timeslot logic away into timeslot_fsm. Only keep plain send/receive functions in
abis_rsl.c
- reduce some rsl functions to merely send a message, rename to "_tx_".
- rsl_ipacc_mdcx(): add '_tx_' in the name; move parts that change the lchan state out into the
lchan_fsm, the lchan->abis_ip.* are now set there prior to invoking this function.
- move all timers and error/release handling away into various FSMs.
- tweak ipa_smod_s_for_lchan() and ipa_rtp_pt_for_lchan() to not require an
lchan passed, but just mode,type that they require. Rename to
ipacc_speech_mode*() and ipacc_payload_type().
- add rsl_forward_layer3_info, used for inter-BSC HO MO, to just send the RR
message received during BSSMAP Handover Command.
- move various logging to LOG_LCHAN() in order to log with the lchan FSM instance.
One drawback is that the lchan FSM is limited to one logging category, i.e. this moves some logging
from DRR to DRSL. It might actually make sense to combine those categories.
- lose LOGP...LOGPC logging cascades: they are bad for gsmtap logging and for performance.
- handle_classmark_chg(): change logging, move cm2 len check out of the cm3 condition (I hope that's
correct).
- gsm48_send_ho_cmd(): split off gsm48_make_ho_cmd() which doesn't send right away, so that during
inter-bsc HO we can make an RR Handover Command to send via the MSC to the remote BSS.
assignment_fsm.c:
- the Chan Mode Modify in case of re-using the same lchan is not implemented
yet, because this was also missing in the previous implementation (OS#3357).
osmo_bsc_api.c:
- simplify bsc_mr_config() and move to lchan_fsm.c, the only caller; rename to
lchan_mr_config(). (bsc_mr_config() used to copy the values to mr_bts_lv
twice, once by member assignment and then again with a memcpy.)
- During handover, we used to copy the MR config from the old lchan. Since we
may handover between FR and HR, rather set the MR Config anew every time, so
that FR rates are always available on FR lchans, and never on HR lchans.
Depends: I03ee7ce840ecfa0b6a33358e7385528aabd4873f (libosmocore),
I1f2918418c38918c5ac70acaa51a47adfca12b5e (libosmocore)
Change-Id: I82e3f918295daa83274a4cf803f046979f284366
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Change-Id: If212fcd042051b6fa53484254223614c5b93a9c6
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"utils" suggests thin helpers to aid using a proper API, while this .c file
actually *is* the proper RR API. Rename from "utils" to "rr".
Change-Id: I0ffff63d57f03cb324df8e40e41caea5b55a2c85
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In certain situations like handover or assignment, DTAP must not go out via RSL
directly but is cached to be submitted later. Make sure that all RSL DTAP
sending adheres to this:
gscon_submit_rsl_dtap() is the new "public" API to request an RSL DTAP to be
sent. Depending on the gscon's state, this ends up in the cache or is sent
directly. When caching, there is no way to tell whether sending will succeed or
not, so semantically it does not make sense to even return a result code. Just
return void. Change all "public" callers to gscon_submit_rsl_dtap().
Merge gsm0808_submit_dtap() and submit_dtap() guts to gsm0808_send_rsl_dtap(),
static in bsc_subscr_conn_fsm.c: directly send DTAP, assume a conn->lchan to be
present, or otherwise trigger a BSSMAP Clear Request.
The static submit_dtap() becomes a thin convenience wrapper.
Move ho_dtap_cache* functions to bsc_subscr_conn_fsm.c and rename to
gscon_dtap_cache_* -- they are not only for handover, also for assignment.
Function gsm0808_submit_dtap() m
Introduce function gscon_submit_rsl_dtap()
Change-Id: I6ffd7aa641c8905292c769400048c96aa0949585
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9-bit BSIC exist in the 3GPP specs, but we don't use them anywhere. Rather
remove that choice from the API and UI.
Change-Id: I29b92f47da2636d3a19f073755f9382fa98f9010
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Depends: Ia71ba742108b5ff020997bfb612ad5eb30d04fcd (libosmocore)
Change-Id: I0153d7069817fba9146ddc11214de2757d7d37bf
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The vty option bts->codec-support allows the user to set the supported
codecs per BTS level. However, those values are currently only used to
make the handover decision but the logic that handles the BSSMAP
ASSIGNMENT REQUEST does not check those flags.
- Do not ignore bts->codec-support flags on BSSMAP ASSIGNMENT REQUEST
Change-Id: I285234e9c81de74d9fb9907fca2c443b08537435
Closes: OS#3361
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At the moment there are three sources that may advertise a list of
supported audio codec/rate settings. There is the MS that advertises
advertises a speech codec list and the MSC that sends a channel type
information element over A and there are also settings in the bsc
configuration file that may restrict the codec/rate types that are
allowed to use.
The function match_codec_pref() looks at all of the three buckets and
selects a codec that satisfies all three. This is already a somewhat
complicated process, overit is very isolated, so lets give it its own
c-file.
Due to the lack of unit-tests it is very hard to make changes here so
lets add also unit-test to make sure that regressions are catched early.
- Put match_codec_pref() and all its helper functions into a separate
c-file.
- Add a unit test.
Change-Id: Iabedfdcec8b99a319f2d57cbea45c5e36c7b6e29
Related: OS#3361
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Change-Id: Ie98a68de207aea69befd24af3f302b6ef9e6f8e4
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Change-Id: I9127ddb7b29eb82defd3a8afac9c1dbfd424fb72
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Change-Id: I52fa8f3183c93ed362d8252d20daf00c60a117c8
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Instead of silently setting the use count to 1, instead increment with an
explicit bsc_subsct_get(), which then logs the event along with the place that
created the subscriber.
Change-Id: Ia72f8010b7b2e1ca44e3b005c0f2c05f3eeae8d5
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struct bsc_api was used to provide an abstract API for both osmo-bsc and
osmo-msc, between BSC and MSC. That's no longer needed, so get rid of it, to
prevent code turbulences it creates for no reason.
Change-Id: I3fd5888c63a0b4f95520a498320aa105a6d60579
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Move all of libbsc/ into osmo-bsc/, and separate/move some implementations to
allow linking from utils/* and ipaccess/* without pulling in unccessary
dependencies.
Some utilities use gsm_network and gsm_bts structs, which already include data
structures for fairly advanced uses. Move initialization that only osmo-bsc
needs into new bsc_network_init() and bsc_bts_alloc_register() functions, so
that the leaner tools can use the old gsm_* versions without the need to link
everything (e.g. handover and lchan alloc code).
In some instances, there need to be stubs if to cut off linking "just before
the RSL level" and prevent dependencies from creeping in.
- abis_rsl_rcvmsg(): the only program currently interpreting RSL messages is
osmo-bsc, the utils are merely concerned with OML, if at all.
- paging_flush_bts(): ip.access nanobts models call this when the RSL link is
dropped. Only osmo-bsc actually needs to do anything there.
- on_gsm_ts_init(): the mechanism to trigger timeslot initialization is related
to OML, while this action to take on init would pull in RSL dependencies.
utils/ and ipaccess/ each have a stubs.c file to implement these stubs. Tests
implement stubs inline where required.
From src/utils/, src/ipaccess/ and tests/*/, link in .o files from osmo-bsc/.
In order for this to work, the osmo-bsc subdir must be built before the other
source trees. (An alternative would be to include the .c files as sources, but
that would re-compile them in every source tree. Not a large burden really, but
unless linking .o files gives problems, let's have the quicker build.)
Minor obvious cleanups creep in with this patch, I will not bother to name them
individually now unless code review asks me to.
Rationale:
1) libbsc has been separate to use it for osmo-nitb and osmo-bsc in the old
openbsc.git. This is no longer required, and spreading over libbsc and osmo-bsc
is distracting.
2) Recently, ridiculous linking requirements have made adding new functions
cumbersome, because libbsc has started depending on osmo-bsc/*.c
implementations: on gscon FSM and bssap functions. For example, neither
bs11_config nor ipaccess-config nor bts_test need handover_cfg or BSSMAP
message composition. It makes no sense to link the entire osmo-bsc to it, nor
do we want to keep adding stubs to each linking realm.
Change-Id: I36a586726f5818121abe54d25654819fc451d3bf
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The TEST_SCAN_TO_MSC is completely unused, but still the code linked
bsc_scan_bts_msg() for the unused code path. This is unlikely to ever be
expanded. Remove TEST_SCAN_TO_MSC and reduce linking requirements.
(I am this close to dropping the test entirely to avoid continuous linking
annoyance, but ok, since nothing else tests timezones AFAIK, keeping it.)
Change-Id: I27521950432e412f919cde811c9473557d0ec25e
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Rationale: channel_test is trivial and useless, probably only exists as a
legacy from openbsc.git.
- it tests two printf()s of "(bts=45,trx=0,ts=3,ss=4)", hardly useful.
- it tests ts_subslots() behavior for dyn ts, which will soon be replaced by a
most trivial mapping that does no longer need complex dyn ts state
evaluation (when introducing the new timeslot FSM to handle dyn TS switchover).
Change-Id: Ib2232da8e7fa964b92492d7b778320401dc97703
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Rationale:
- All it does is compose four Paging Requests and feed it into the osmo-bsc
bssap_udt, and expects the cell identifier to be decoded properly.
- To do so it employs a comparatively huge linking effort. This linking effort
is becoming annoying in my ongoing work and is just not worth it.
- We have comprehensive cell identifier tests in ttcn3, verifying that the
proper cells are paged, and that actually for *all* cell identifier types.
Change-Id: I07cf23b66de36cfa1142a11b9f85e9c0190ee314
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The bsc_msc_connection dates back to the old pre-libosmo-sigtran
days, and 90% of the field members weren't used at all (even the
new sigtran specific ones!). Let's merge what remains into struct
bsc_msc_data.
As a side effect, the already dysfunctional "dest A.B.C.D" VTY
command has been removed from the MSC node.
There's quite a bit of fall-out in the CTRL interface, which was
the code with strongest ties to bsc_msc_connection. This was
resolved by properly porting CTRL handling over to libosmo-sigtran,
meaning that an IPA/SCCPlite connected MSC can now again send CTRL
GET/SET commands, and can also receive those selective few TRAPs
that old osmo-bsc-sccplite also sent to its MSC[s].
Change-Id: I6b7354f3b23a26bb4eab12213ca3d3b614c8154f
Related: OS#2012
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osmo-bsc_nat is too heavily tied into legacy SCCPlite code, as it
is not using libosmo-sigtran/osmo_ss7 so far. It's also full of
customer-specific code and it's shared use of some libbsc code here
has been complicating osmo-bsc development.
The current plan is to continue to use osmo-bsc_nat from openbsc.git
for those legacy users that need it, and not use osmo-bsc_nat in
new 3GPP AoIP setups. Should we ever get a strong demand for an AoIP
based bsc_nat, we can still revisit this later.
Change-Id: Ia05dc76336a64a7f08962843b9a7cc19f2c83387
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At this point, meas-feed is usable again, however, osmo-bsc is not able to
include the IMSI in every report like osmo-nitb did.
In consequence, the meas-vis and meas-web tools are unable to handle the
current measurement reports: these so far use the IMSI to list reports, and all
reports without an IMSI are collapsed onto the same line, swapping values.
So though osmo-bsc now sends usable measurement reports via meas-feed, two
avenues to improve should be pursued:
OS#3192: the visualization tools should use bts,ts,ss numbers, not IMSI.
OS#2969: osmo-bsc should always know a mobile identity.
Related: OS#2968
Change-Id: I186c7a995dd2b81746c32a58b55da64ed195a1ce
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Change-Id: Ifbbfede185aec6573fe7d8bcb49dc5be9f7e7d0b
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