PdchUlcTest output changes because the original state NULL is not
expected when transactioning to RELEASING upon MAX N310* being hit. In
any case, none of those events should happen in NULL state, but we
don't really care about TBF states there so we are fine with whatever
the state is.
Related: OS#2709
Change-Id: I516b8d989a0d705e5664f8aeaf7d108e0105aa16
While at it, method maybe_start_new_window is renamed to
rcvd_dl_final_ack to make more sense out of the code.
Related: OS#2709
Change-Id: Iebd650c1036ef2d5132789778be7117ce3391c01
Prior code was wrong, as in it did stuff diferent to what is expected
and actually done in osmo-pcu. In osmo-pcu code, the function is guarded
and only called in FLOW or FINISHED state by the scheduler.
Change-Id: If8029bee90adceee128ebb20c033756efd50e90e
At some point later in time the state_flags will most probably be split
into different variables, one ending up in a different FSM. It is moved
so far to the exsiting FSM from the C++ class since it's easier to
access it from C and C++ code, and anyway that kind of information
belongs to the FSM.
Related: OS#2709
Change-Id: I3c62e9e83965cb28065338733f182863e54d7474
Run bts_pch_timer_remove() on each entry of the BTS specific pch_timer
list, so we don't have a memory leak and so the timer doesn't
potentially fire for a deallocated BTS.
Fixes: d3c7591 ("Add counters: pcu.bts.N.pch.requests.timeout")
Change-Id: Ia5e33d1894408e93a51c452002ef2f5758808269
This reverts commit 846fd248dc.
The commit introduced a leak of UL-TBF, which do not time out and
accumulate indefinitely, leading to out-of-memory for the running
osmo-pcu process.
A proper fix for the leak is pending on a development branch pespin/fsm,
but that branch is not yet ready for merging. Hence let's re-introduce
timer T3169 to avoid the OOM due to lingering UL-TBF.
Related: OS#5209
Change-Id: I99a7d2ddf68a76739ce2db1d6a44967dd97667b0
When slowly debugging test_tbf_dl_llc_loss, bssgp_tx_llc_discarded() may
trigger, submitting events to the libosmogb code. Since it didn't
properly set up the callback, it would end up in a null pointer
dereference when lib code tried to use backward-compatible API (which
was neither set up properly).
"""
TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=ASSIGN) Discarding LLC PDU because lifetime limit reached, count=3 new_queue_size=0
BSSGP (BVCI=2234) Tx LLC-DISCARDED TLLI=0xc0123456, FRAMES=3, OCTETS=57
/git/libosmocore/src/gb/gprs_ns.c:271:2: runtime error: member access within null pointer of type 'struct gprs_ns_inst'
"""
"""
(gdb) bt
#0 0x00007ffff729cac0 in gprs_active_nsvc_by_nsei (nsi=nsi@entry=0x0, nsei=2234, bvci=bvci@entry=0)
at /git/libosmocore/src/gb/gprs_ns.c:271
#1 0x00007ffff72b1fec in gprs_ns_sendmsg (nsi=0x0, msg=0x621000000160) at /git/libosmocore/src/gb/gprs_ns.c:1087
#2 0x00007ffff72d1803 in _gprs_ns_sendmsg (ctx=<optimized out>, msg=<optimized out>) at /git/libosmocore/src/gb/gprs_bssgp.c:80
#3 0x00007ffff730226f in bssgp_tx_llc_discarded (bctx=<optimized out>, tlli=<optimized out>, num_frames=<optimized out>, num_octets=<optimized out>)
at /git/libosmocore/src/gb/gprs_bssgp_bss.c:249
#4 0x000055555588243e in gprs_rlcmac_dl_tbf::llc_dequeue (this=0x7ffff1622860, bctx=<optimized out>)
at /git/osmo-pcu/src/tbf_dl.cpp:413
"""
Change-Id: Iee5bcf21afc8980a14f90f5b1ead6d2460a244ea
In existing previous code, pdch->ulc would be freed in
gprs_rlcmac_pdch::free_resources() when it became disabled as per PCUIF
info_ind (for instance, when a DYN TS is switched PDCH->SDCCH8).
However, pdch->ulc was so far only allocated during pdch_init, which is
only called during bts_alloc() time.
Hence, after first info_ind disabling it, if it became again enabled
(again by info_ind re-enabling it after SDCCH8 was not longer in use),
the pdch->ulc would be used again but it would point to freed memory.
Let's rearrange how/when resources are freed to make it more logical.
With this patch, pdch internal resources are freed upon ->disable(), and
re-allocated upon ->enable().
Change-Id: Id51f5f6a54ac9f24b784c17bc360ac38f5726fc7
This is only an initial implementation, where all state changes are
still done outside the FSM itself.
The idea is to do the move in several commits so that they can be
digested better in logical steps and avoid major break up.
Related: OS#2709
Change-Id: I6bb4baea2dee191ba5bbcbec2ea9dcf681aa1237
This is right now not an issue, but it will be whenever talloc
destructor contains extra steps like freeing an FSM.
Change-Id: I096ff56321c8ae5e66634537aae8b95804282c65
This allows more easily finding when this specific scenario happens, and
can easily be compared against the PACCH one.
Change-Id: I609792a40fda2a798ca71a0e9f5639d0a0f011d7
Store direction check to simplify the code.
Get rid of 2-step LOGP to avoid multi-row logs in gsmtap log.
Change-Id: Ia2e061da82ddce564b2d768d8ade1672c22934e2
Tbftest expectatins need to change because 5000/20 = 250 < 255, hence
the message is now sent as units of 20ms instead of seconds.
Related: OS#3928
Change-Id: I48b34b94b1a5dfb046a3a6cf8a0d944a7c9b6754
Document the function, make it look similar to usual TBF creation path
tbf_alloc_ul()->tbf_alloc_ul_tbf->tbf::setup(), which it mimics with
some differences.
Get rid of unneeded stuff like creating MS and settings its TLLI (that's
already done in only caller of the function). There's no need for
calling update_ms() either.
Change-Id: I61df2e4f0f0df1f8db941741a2d35a2319252c5e
Now that we finally handle N3101 and N3103 correctly, we can fix abuse
of T3169 we were doing to make sure TBFs were freed.
According to 3GPP TS 44.060, T3169 should be armed:
* N3101_MAX reached
* N3103_MAX reached
Furthermore, when T3169 is enabled, the tbf should be in state
RELEASING so that its USF is not used.
See full description: https://osmocom.org/issues/5033#note-2
Related: OS#5033
Change-Id: I2cec531e2633281b88f69ba065c0105580c81076
Use recently added PDCH UL Controller to verify expectancies.
Test test_packet_access_rej_prr is rewritten since it didn't make sense
as it was before, since it relied on osmo-pcu not checking stuff
properly to trigger the reject. The RACH requests are changed to
allocate 8 SBAs (maximum of 7 concurrent USFs). Allocating the SBA
doesn't reserve a USF, that happens at PKT RESOURCE REQUEST, hence we
end up exhausting resources there and triggering the REJECT at that
point.
Previous version of the patch allocated TBFs directly through RACH req,
and then submitted an extra PKT RESOURCE REQUEST which PCU didn't expect
to trigger the reject.
Change-Id: I157e72160317340ee7742c78c62a25d3d98fc01e
That field is not needed anymore, and it works only under the assumption
that only 1 poll request can be active at a time per TBF, which is not
true.
Change-Id: I9b8bed7741d385bab4cd8c64b841a78a02a05fe1
That field is not needed anymore, and it works only under the assumption
that only 1 poll request can be active at a time per TBF, which is not
true.
Change-Id: I63a34a702f028b871530fb7caeb13e8ea1cc78ac
Value 'false' is always passed by all callers of the function, so
there's no need to pass it. Furthermore, since it's false, there's no
need to access poll_fn since RRBP will always be invalid.
Change-Id: Ia48ce2a021865e76e813dedb22aca9c2522c5693
The poll_state logic was part of previous implementation (prior to pdch
ul controller) where the ssumption was that TBF could only had 1 POLL
request in transit, which is really not true. With current
infrastructure we don't need this state tracking at all.
Change-Id: Ie5b807ccd38aa736ae11b3310ca61ad0156ca4d4
There's no good reason to allow only for 1 concurrent POLL requested to
a TBF, it was onyl done this was as an implementation limitation factor.
It can well happen that several multiple POLLs may be in transit at the
same time, eg to get DL ACK/NACK as well as to get a CTRL ACK for a Pkt
Cell Change Continue (NACC).
Change-Id: Ic4080db684a4626cae90dd574d123081981284ca
This API is not really needed anymore, since anyway it works under the
assumption there can only be 1 POLL in transit per TBF, which isn't
necessarily true.
Change-Id: I875f51cade95faeb2d79dcebfead4c83e23a731b
This allows easily checking the initial reason to trigger the poll when
either it is received or times out.
Later on this reason can be transformed into an FSM event and sent to
the related FSM.
Related: OS#5020
Change-Id: Ie8fefd1f47ad674ce597a8065b15284088956bde
Make sure an unreserved FN is picked and reserved when allocating and
scheduling an SBA.
In practice this has no change in behavior right now, since anyway using
an offset of 52 FNs ensure no USF or POLL has alredy been scheduled that
far in the future. Since it's also impossible to allocate more than 1
SBA per PDCH and RTS FN, we are also safe about multiple SBAs being
allocated, because we use a hardcoded offset of 52.
However, that could change in the future, when we dynamically tweak the
current offset of 52 FN based on information from BTS about its AGCH
queue load:
* If load is high, we may need to increase the offset since it
will take more time for the BTS to transmit the TBF and hence we must
reserve a TBF starting time further in the future (higher FN).
* If load turns low, we may schedule next SBA a bit more nearby in time
than the previously allocated SBA, hence here there could be a
collision.
Related: OS#5020
Change-Id: I2d4e21e2307de6c17748e8da5c7e149c947a7eb9
This way PCU can now detect whether scheduled UL blocks through USF
were never received. This allows in a follow-up patch to start
increasing N3101 properly.
Related: OS#5033
Change-Id: Ia99c9edad6e5bd837e9baeb4fb2683b227887957
There's no need for setting the FN in RA.ind since we anyway already
receive a DATA.ind beforehand.
Furthermore, the applied delay of 5 in the call is not really used at
all.
Change-Id: I437f4f95d054aea96bec3b9343e495451020ff3c
Issue will be fixed in next commit. Leaving ASSERTs disabled so that
test passes in jenkins.
Related: OS#5020
Change-Id: I657db6b300363f8f3a9e4cfaf7a7f49e361a0512
TbfTest is updated to submit empty blocks to have somehow meaningful
output (at least as meaningful test results as before, not much). That's
because we must update bts->curr_fn to have polls expire.
Related: OS#5020
Change-Id: I683ca738ce5a133c49c36a1d94439a942d64a831
Right now we handle different types of UL allocations in different
classes like PollAllocator and SBAllocator, and they usually don't take
into account the other one in most cases. Furthermore, those objects are
usually per-BTS object, instead of per PDCH object.
This is a first step towards having a unified per-PDCH controller which
takes care of controlling what is scheduled and hence expected on the
uplink. Each PDCH has a UL Controller which keeps track of all reserved
uplink frame, be it SB, RRBP poll or USF assigned, all under the same
API.
As a first step, only the SBA part is fully implemented and used (being
it the easiest part to replace); TBF poll+usf will come in follow-up
patches later on. As a result, the SBAllocator per-BTS class dissappears
but some of its code is refactored/reused to provide more features to the
gprs_rlcmac_sba object, which is also further integrated into the new UL
Controller.
Related: OS#5020
Change-Id: I84b24beea4a1aa2c1528f41435f77bd16df2b947
Since recently (see Depends below), BTS side submits DATA.ind with len=0
to announce nothing was received on that UL block FN. This will allow
osmo-pcu track time more accurately, and use this information to quickly
find out if a UL block was expected as requested by RRBP or USF poll and
increment counters such as N3101 (finally being able to properly
implement timers such as T3619).
Depends: osmo-bts.git Change-Id I343c7a721dab72411edbca816c8864926bc329fb
Related: OS#5020
Change-Id: Ibc495173119465e74f726ddc36e312334e6dc0fd
If Idle TBF timer (X2031) is set to 0, it means the TBF release is
immediately started once all queued data has been scheduled. In that
case, we must set FBI=1 (by setting cv=0) and move to FINISH state.
This used to work over the usual path where X2031 != 0, because release
start will alays happen at a later sched poll time where a dummy LLC
frame is sent and FBI set accordingly.
Change-Id: Ib20602936ae084c413f6bfe14eea33b602020be0
Old commit getting rid of LLC UI dummy and updating create_new_bsn()
function introduced a bug by not moving update of value m_last_dl_drained_fn
prior to a new break introduced.
As a result, the value is not updated in the case LLC queue becomes
drained but last few bytes are drained at exactly that moment.
Furthermore, then the IDLE tbf timer (X2031, keep_open())) returns always
true since according to it the drain never happened.
The impact of the bug is basically delaying a bit more than expected the
time the TBF stays in IDLE state with the TBF release process yet
to be started.
Related: OS#4849
Fixes: 7d0f9a0ec3
Change-Id: I7420aeffda3500bcdc990291e4a56511af433ff9
Since a while ago, the data architecture was changed so that TBF is
guaranteed to always have a MS object associated. Hence, it makes no
sense to pass the MS object as a separate param as we can take it from
tbf object and makes code less confusing.
Change-Id: Idc0c76cf6f007afa4236480cdad0d8e99dabec5f
Before this patch, allocate_usf() was implemented to only allocate 1 USF
per TBF, regardless of the available ul_slot mask.
As a result, only 1 slot at max was allocated to any TBF. That's a pity
because usual multislot classes like 12 support up to 2 UL slots per TBF
(in common TS with DL).
This patch reworks allocate_usf() to allocate as many UL multislots as
possible (given mslot class, current USF availability, TFI availability,
related DL TBF slots for the same MS, etc.).
As a result, it can be seen that AllocTest results change substantially
and maximum concurrent TBF allocation drops under some conditions.
That happens due to more USFs being reserved (because each TBF has now
more UL slots reserved). Hence now USF exhaustion becomes the usual
limitation factor as per the number of concurrent TBFs than can be
handled per TRX (as opposed to TFIs previously).
Some of the biggest limitations in test appear though because really
high end multislot classes are used, which can consume high volumes of
UL slots (USFs), and which are probably not the most extended devices in
the field.
Moreover, in general the curren timeslot allocator for a given
multislot class will in general try to optimize the DL side gathering
most of the possible timeslots there. That means, for instance on ms
class 12 (4 Tx, 4Rx, 5 Sum), 4 DL slots and 1 UL slot will still be
selected. But in the case where only 3 PDCHs are available, then with
this new multi-slot UL support a TBF will reserve 3 DL slots and 2 UL
slots, while before this patch it would only taken 1 UL slot instead of
2.
This USF exhaustion situation can be improved in the future by
parametrizing (VTY command?) the maximum amount of UL slots that a TBF
can reserve, making for instance a default value of 2, meaning usual
classes can gather up 2 UL timelosts at a time while forbidding high-end
hungry classes to gather up to 8 UL timeslots.
Another approach would be to dynamically limit the amount of allowed
reservable UL timeslots based on current USF reservation load.
Related: OS#2282
Change-Id: Id97cc6e3b769511b591b1694549e0dac55227c43
The old VTY command is marked as deprecated and still overrides the use
in case it's used.
Related: SYS#5358
Depends: libosmocore.git Change-Id I74fb0a3afc1ac4aadbfc609b882d929401f790eb
Depends: osmo-bsc.git Change-Id I8b97ea11bad5fe05f2f634945b5703ee9abde81d
Change-Id: I46f2a955b157a409055fca7fb917dc4f75482426
Let's disable category here since we don't care about its formatting here.
In any case, every test relying on logging output validation should
always explicitly state the config to avoid issues in the future if
default values change.
Change-Id: I7f9c56313cfaa74ebe666f44763a83d8102f5484
Related: OS#5034
All vectors should be valid, since they were generated by an MS.
As can be seen, osmo-pcu fails to decode one of the vectors.
Change-Id: I37a2ddd394eeffa1cae0f3e419eeee0200a57fcf
OS#4955
Change-Id: Ib5677048f5668185ffe752f97c97d5612eee4d72
A new nacc_fsm is introduced per MS object, with its partner priv
structure struct nacc_fsm_ctx, which exists and is available in the MS
object only during the duration of the NACC procedure.
The NACC context is created on an MS whenever a Pkt Cell Change
Notification is received on Uplink RLCMAC, which asks for neighbor
information of a given ARFCN+BSIC.
First, the target ARFCN+BSIC needs to be translated into a CGI-PS
(RAC+CI) address. That's done by asking the BSC through the Neighbour
Resolution Service available in osmo-bsc using the CTRL interface.
Once the CGI-PS of the target cell is known, PCU starts a RIM RAN-INFO
request against the SGSN (which will route the request as needed), and
wait for a response containing the SI bits from the target cell.
After the SI are received, the scheduler is instructed to eventually
poll a TBF for the MS originating the CCN, so that we can send the SI
encapsulated into multiple Packet Neighbor Cell Data messages on the
downlink.
One all the SI bits are sent, the scheduler is instructed to send a
Packet Cell Change Continue message.
Once the message above has been sent, the FSM autodestroys itself.
Caches are also introduced in this patch which allows for re-using
recently known translations ARFCN+BSIC -> CGI-PS and CGI-PS -> SI_INFO
respectively.
Change-Id: Id35f40d05f3e081f32fddbf1fa34cb338db452ca
Under some circumstances, it could happen that a DL TBF is created as a
GPRS TBF due to not yet having enough information of the MS, and only
after the TBF is created the PCU gains that information and upgrades the
MS mode to "EGPRS". Hence, there's the possibility to run into a
situation where a GPRS TBF is attached to a EGPRS MS.
It may also happen sometimes that despite the TBF and the MS be EGPRS,
there's need to further limit the DL MCS to use, eg. MCS1-4 (GMSK).
As a result, when asking for the current DL (M)CS to use, we must tell
the MS which kind of limitations we want to apply. The later reasoning
was already implemented when GPRS+EGPRS multiplexing was added, but the
former was not being checked. Hence, by further spreading through the
call stack the "req_kind_mode" we match both cases.
Related: OS#4973
Change-Id: Ic0276ce045660713129f0c72f1158a3321c5977f
This patch doesn't really tests whether osmo-pcu can work on a multi-bts
environment, but it prepares the data structures to be able to do so at
any later point in time.
Change-Id: I6b10913f46c19d438c4e250a436a7446694b725a
There's no real point in using C++ there, and using C++ makes the
compiler fail to use llist_head in multi-bts patches added later due to:
"""
'offsetof' within non-standard-layout type is conditionally-supported
"""
Change-Id: I8965b5cc5a713e64788b5b6aa183d3035341ddbb
There's no real use of C++ in that file, and it causes problems when
using llist_head entry macros in future patches adding initial support
for multiple BTS in PCU object, so let's move it to plain C.
Change-Id: Ic771a89fd78b5e66151a5384f0ff6a8895589466
There's no BTS single global object anymore, get rid of those APIs. Move
users to use "pcu->bts", which will evolve to a linked list in the
future.
Change-Id: I9cf762b0d3cb9e2cc3582727e07fa82c8e183ec5
Previous work on BTS class started to get stuff out of the C++ struct
into a C struct (BTS -> struct gprs_glcmac_bts) so that some parts of
it were accessible from C code. Doing so, however, ended up being messy
too, since all code needs to be switching from one object to another,
which actually refer to the same logical component.
Let's instead rejoin the structures and make sure the struct is
accessible and usable from both C and C++ code by rewriting all methods
to be C compatible and converting 3 allocated suboject as pointers.
This way BTS can internally still use those C++ objects while providing
a clean APi to both C and C++ code.
Change-Id: I7d12c896c5ded659ca9d3bff4cf3a3fc857db9dd
Currently the BTS object (and gprs_rlcmac_bts struct) are used to hold
both PCU global fields and BTS specific fields, all mangled together.
The BTS is even accessed in lots of places by means of a singleton.
This patch introduces a new struct gprs_pcu object aimed at holding all
global state, and several fields are already moved from BTS to it. The
new object can be accessed as global variable "the_pcu", reusing and
including an already exisitng "the_pcu" global variable only used for
bssgp related purposes so far.
This is only a first step towards having a complete split global pcu and
BTS, some fields are still kept in BTS and will be moved over follow-up
smaller patches in the future (since this patch is already quite big).
So far, the code still only supports one BTS, which can be accessed
using the_pcu->bts. In the future that field will be replaced with a
list, and the BTS singletons will be removed.
The cur_fn output changes in TbfTest are actually a side effect fix,
since the singleton main_bts() now points internally to the_pcu->bts,
hence the same we allocate and assign in the test. Beforehand, "the_bts"
was allocated in the stack while main_bts() still returned an unrelated
singleton BTS object instance.
Related: OS#4935
Change-Id: I88e3c6471b80245ce3798223f1a61190f14aa840
When allocating multiple slots for a UE the following example
is not allowed 'UU----UU' for a UE class 12.
The time slot number can not roll over 7 and move to 0.
44.060 or 45.002 only specifies contigous however it was unclear
it this is an allowed pattern.
Only the example 45.002 B.3 in release 12 cleared this up.
It gives an example for a multi slot class 5 UE which has 7 possible
configuration this means the rolled over is not allowed.
Multislot class type 2 UE doesn't have this limitation.
Further if a UE supports 8 time slots this is not a limitation because
the window size (45.002 B.1) can include all time slots.
Releated: SYS#5073
Change-Id: I16019bdbe741b37b83b62749b840a3b7f4ddc6c7
When both TBFs (Dl, Ul), are detached, ms_detach_tbf() will call
ms_start_timer() which will hold a reference of the MS (ms_ref()) and
wait for X seconds (VTY config, T=-2030, 60 seconds by default) before
unrefing the MS, which will trigger ms_update_status() finally (ref==0)
and will in turn call cb.ms_idle(), which will tell the ms_storage to
free the MS.
This mechanism is used to keep MS objects around for a certain time so
that when new TBFs are established, we have cached interesting
information about the MS, ready to use.
However, in AllocTest, tons of MS are allocated in a loop calling a
function (such as test_alloc_b_ul_dl()). In that function, a BTS is
allocated in the stack and at the end of the function BTS::cleanup() is
called due to implicit destructor, which ends up calling
ms_storage::cleanup() which removes all MS from its list and frees them
*if they are not idle*. The problem here, is that due to T=-2030, an
extra reference is hold and hence the ms is not considered idle
(ms_is_idle() checks ms->ref==0). As a result, the MS is never freed,
because we don't use libosmocore mainloop here (and in any case, it
would take 60 seconds to free it).
By setting the timeout of T=-2030 to 0, ms_start_timer will avoid using
the timer and will also avoid holding the extra reference, hence
allowing ms_storage to free the object during cleanup().
This fix really helps in improving performance for AllocTest specially
after MS object contains a rate_ctr. As tons of MS objects were left
alive, they stood in the rate_ctr single per-process queue, making the
test last crazy amount of time and spending 50% of the time or more
iterating the list full of MS related rate counters.
Change-Id: I6b6ebe8903e4fe76da5e09b02b6ef28542007b6c
It is expected that the tbf object is freed at any moment in time, for
instance if osmo-pcu drops PCUIF connection with osmo-bts. I couldn't
find any reason why it would e dangerous to free the tbf, so let's
remove this message.
related: OS#4779
Change-Id: I4ab5ccaa5bf6257b18d8fd5ba06baab083821817
As we integrate osmo-pcu more and more with libosmocore features, it
becomes really hard to use them since libosmocore relies heavily on C
specific compilation features, which are not available in old C++
compilers (such as designated initializers for complex types in FSMs).
GprsMs is right now a quite simple object since initial design of
osmo-pcu made it optional and most of the logic was placed and stored
duplicated in TBF objects. However, that's changing as we introduce more
features, with the GprsMS class getting more weight. Hence, let's move
it now to be a C struct in order to be able to easily use libosmocore
features there, such as FSMs.
Some helper classes which GprsMs uses are also mostly move to C since
they are mostly structs with methods, so there's no point in having
duplicated APIs for C++ and C for such simple cases.
For some more complex classes, like (ul_,dl_)tbf, C API bindings are
added where needed so that GprsMs can use functionalitites from that
class. Most of those APIs can be kept afterwards and drop the C++ ones
since they provide no benefit in general.
Change-Id: I0b50e3367aaad9dcada76da97b438e452c8b230c
According to:
* 3GPP TS 44.060 version 16.0.0 "9.3.1a Delayed release of downlink Temporary Block Flow"
* 3GPP TS 44.064 version 16.0.0 "6.4.2.2 Unconfirmed Information (UI) Dummy command"
LLC UI Dummy frames are to be used when there no more data to send, only
in order to delay the release of a TBF. Hence, while not incorrect per
se, makes no sense to send those LLC UI Dummy frames inserted into
rlcmac blocks which already contain other LLC frames, since the MS in
that case is already being kept active.
It only makes sense to send those LLC UI Dummy frames when we have
nothing else to send, that is, alone inside a RLCMAC block without other
LLC frames.
Related: OS#4849
Change-Id: Ifae1a7b2b3dfad8df19585063088ba0df2749c8f
In previous status, if USF for GPRS-only MS was selected, then EGPRS
TBFs were skipped and either a GPRS TBF was selected or a Dummy Block
was sent. That means the behavior was unfair towards EGPRS TBFs, because
sometimes they were skipped in favor of GPRS ones.
This patch imporves the situation in the above mentioned USF scenario, by
first, under specific conditions, allowing selection of an EGPRS TBF and
then forcing it to transmit in EGPRS-GMSK (MCS1-4) so that the
USF-targeted MS can still decode the USF, while at the same time
providing more fairness by allowing the EGPRS TBF to transmit data.
The specific conditions mentioned above are, mainly, related to the fact
that once a DL data block has been sent, and hence a BSN was assigned to
it, it cannot be retransmitted later using another MCS, since lower
MCS1-4 wouldn't be able to contain higher MCS RLC payload.
The set of conditions could be expanded in the future by also selecting
the EGPRS TBF if retransmition is required and the block to be
retransmitted was originally transmitted as MCS1-4.
Related: OS#4544
Change-Id: I9af23e175435fe9ae7b0e4119ad52fcd4707b9ca
There's actually 3 errors:
* Its value should be updated, not the pointer itself
* Value should be increased, not decreased
* bitvec_read_field() API is already advancing it, no need to do it
Fixes: OS#4838
Change-Id: I009abc373794e148091e637ffee80c6461960945
The assumption that TLLI 0x00000000 is invalid and can be used
as the initializer is wrong. Similar to TMSI, 0x00000000 is a
perfectly valid value, while 0xffffffff is reserved - use it.
According to 3GPP TS 23.003, section 2.4, a TMSI/P-TMSI with
all 32 bits equal to 1 is special and shall not be allocated by
the network. The reason is that it must be stored on the SIM,
where 'ff'O represents the erased state. According to section
2.6 of the same document, a local/foreign TLLI is derived from
P-TMSI, so the same rule applies to TLLI.
I manually checked and corrected all occurances of 'tlli' in the
code. The test expectations have been adjusted with this command:
$ find tests/ -name "*.err" | xargs sed -i "s/0x00000000/0xffffffff/g"
so there should be no behavior change. The only exception is
the 'TypesTest', where TLLI 0xffffffff is being encoded and
expected in the hexdump, so I regenerated the test output.
Change-Id: Ie89fab75ecc1d8b5e238d3ff214ea7ac830b68b5
Related: OS#4844
BTS simply notifies the PCU about the supported MCS, and PCU is
responsible for providing correct data formatting supported for the BTS
and the target MS.
Related: OS#4544
Change-Id: Ifcf23771bd23afc64ca6fea38948f98f2d134ecb
For instance if PCU received DL data to be sent to an MS from an SGSN,
and the MS is not currently cached in the PCU (because there's no TBF
active for it), it will page it and transmit the DL data to it.
The SGSN is capable of sending (EGPRS) MS Class information in that same
DL data message, so it's the one responsible for providing that
information if not available at the PCU.
In the PCU if we don't have information about that MS and SGSN didn't
provide us information about it, we cannot assume the MS is going to be
EGPRS capable and even less expecting a specific EGPRS MS class.
So let's drop this code.
Related: OS#4544
Change-Id: Icce66cadb51af25ae0c3b3719940eccb548fe33b
Some tests were wrong (TypesTest) and required modification, since they
were setting a EGPRS MS but then expecting a GPRS assignment.
Change-Id: I9d3ee21c765054a36bd22352e48bde5ffca9225a
Pau Espin
Oliver Smith
Neels Hofmeyr
Vadim Yanitskiy
Harald Welte