the current implementation was somehow broken after a
NAS refactor. It was undetected because we didn't really
use it.
this fixes the simulation by using a single timer to simulate
airplane mode transitions.
the timer is rearmed in the timer_expire() function
if the correspondig event is set.
Has been tested to work well with, e.g.:
--sim.airplane_t_on_ms 5000 --sim.airplane_t_off_ms 10000
fix for #1934
This fixes a race condition between Stack thread and DL
PDU processing that lead to updates of the RLC buffer that
are undetected by the BSR routine.
What happens is that in a UL SCH PDU all outstanding data is transmitted
and and a LBSR with all zero buffers is sent.
14:39:47.327301 [MAC ] [D] [ 3793] BSR: LCID=3 old_buffer=59
14:39:47.330600 [MAC ] [I] [ 3793] UL LCID=3 len=58 LBSR: b=0 0 0 0
Note that "old_buffer" isn't set to zero here.
At the same time (same TTI), the MAC PDU processing thread handles DL-SCH PDUs
that may generate new UL PDUs:
14:39:47.330749 [RLC ] [I] DRB1 Tx SDU (54 B, tx_sdu_queue_len=1)
14:39:47.330762 [RLC ] [I] DRB1 Tx SDU (54 B, tx_sdu_queue_len=2)
14:39:47.330775 [RLC ] [I] DRB1 Tx SDU (54 B, tx_sdu_queue_len=3)
..
Those PDUs are "new data" since the previous buffer state was zero.
Here is the race now between the threads, at the end of the bsr::step() function
old_buffer of each LCG is updated with the previous new_buffer, so
the buffer state of LCG=2 is now 59.
Now MAC starts the next TTI:
14:39:47.331910 [MAC ] [D] [ 3794] Running MAC tti=3794
14:39:47.331928 [MAC ] [D] [ 3794] Update Bj: lcid=0, Bj=0
14:39:47.331934 [MAC ] [D] [ 3794] Update Bj: lcid=1, Bj=0
14:39:47.331938 [MAC ] [D] [ 3794] Update Bj: lcid=2, Bj=0
14:39:47.331941 [MAC ] [D] [ 3794] Update Bj: lcid=3, Bj=-1752
14:39:47.331951 [MAC ] [D] [ 3794] BSR: LCID=0 update new buffer=0
14:39:47.331960 [MAC ] [D] [ 3794] BSR: LCID=1 update new buffer=0
14:39:47.331964 [MAC ] [D] [ 3794] BSR: LCID=2 update new buffer=0
14:39:47.331971 [MAC ] [D] [ 3794] BSR: LCID=3 update new buffer=335
14:39:47.331976 [MAC ] [D] [ 3794] BSR: check_new_data() -> get_buffer_state_lcg(0)=0
14:39:47.331980 [MAC ] [D] [ 3794] BSR: check_new_data() -> get_buffer_state_lcg(1)=0
14:39:47.331984 [MAC ] [D] [ 3794] BSR: check_new_data() -> get_buffer_state_lcg(2)=59
14:39:47.331988 [MAC ] [D] [ 3794] BSR: check_new_data() -> get_buffer_state_lcg(3)=0
14:39:47.331993 [MAC ] [D] [ 3794] BSR: LCID=0 old_buffer=0
14:39:47.332000 [MAC ] [D] [ 3794] BSR: LCID=1 old_buffer=0
14:39:47.332003 [MAC ] [D] [ 3794] BSR: LCID=2 old_buffer=0
14:39:47.332007 [MAC ] [D] [ 3794] BSR: LCID=3 old_buffer=335
And since the buffer state of LCG=2 isn't zero, the new data for LCID=3 of that LCG is considered.
So effectivly, the BSR missed the "empty" buffer state for a fraction of time and doesn't
consider the outgoing data generated in the same TTI as new. It therefore
doesn't transmit a BSR.
in which a BSR wasn't
this was a very noisy log that was printed in pretty much
every TTI because the BSR procedure starts a SR whenever
it needs to send a regular BSR. The SR is canceled when a UL
grant arrives but the log line stays there.
Since we are printing a log when we actually signal a SR
to the PHY, this line is not needed.
this fixes the trigger logic for periodic BSRs. Previously we
would always trigger the "new data for highest priority LCID"
whenever new data becomes available for a LCID for which
a BSR has already been sent.
However, a BSR should only be sent if the priority is in fact higher
(lower int number).
the BSR routine had a bug in which it would generate a BSR even
before the reTx timer expires if new data becomes availble
for a LCID that already had data and a BSR was already sent.
The RA test here relies on a BSR in the generated MAC PDU to pass.
However, since after fixing the BSR bug the PDU the MUX unit
no longer generates a BSR, we need generate data for a LCID
which has higher priority than the one for which a BSR has
already been sent.
in ZMQ runs we've seen that entering idle could take quite
a bit of time depending how quickly workers get their samples
sent or reconfigurations done.
In one example up to ~160ms
this patch increases the maximum wait time to 2s.
the BSR trigger wasn't reset after includinga regular or periodic
BSR inside a PDU. This caused the muxing to include another BSR in the
next UL grant. For very small grants, for example with 6 PRBs, this
causes the UE to send way too many BSRs.
this test varifies the correct operation of the retxBSR timer.
the first PDU includes a long BSR to indicate more LCGs have
data to transmit. The retxBSR timer is started and subsequent
PDUs should not send a regular BSR.
After the retxBSR timer expires, a UL PDU should again include
a BSR.
when releasing PUCCH/SRS (see 5.3.13 in 36.331) we need to reset the SR config as well.
In our case, SR is handled by MAC so we need to (re-)configure MAC, not all of
MAC though, just SR.
this avoid logging a warning on UE shutdown if the MAC is already reset
but one of the PHY workers still decodes an UL grant for the old RTNI
21:30:29.254844 [RRC ] [I] Going RRC_IDLE
21:30:29.254848 [RRC ] [I] Proc "Go Idle" - Left connected state
21:30:29.259499 [PHY0] [I] [ 3865] Finished setting new PHY configuration cc_idx=0
21:30:29.259512 [PHY0] [I] [ 3865] Setting new PHY configuration cc_idx=0...
21:30:29.264190 [PHY0] [I] [ 3867] Finished setting new PHY configuration cc_idx=0
21:30:29.275036 [PHY1] [I] [ 3872] PHICH: hi=1, corr=1.0, I_lowest=1, n_dmrs=0, I_phich=0
21:30:29.275050 [MAC ] [W] [ 3872] Received grant for unknown rnti=0x46
this fixes issue #1846 that appears to be related
to the enter/exit state for measurements that is kept
even after a cell disappears from the neighbor list
this fixes#1791 which was caused by a race between
the PHY workers preparing a new UL-SCH PDU and the Stack resetting
the MAC, which in turn resets the HARQ processeses, which cleared
the buffer and set the length to zero.
Not explicitly clearing the buffer on a HARQ reset seems to be
fine since the PHY worker clears the buffer before starting to
pack a new PDU anyway.
The “IPv4 local address type” filter should be 9 bytes since it includes
not only the ip address, but also its subnet mask.
Quoting from 3GPP TS 24.008 10.5.6.12:
"""
For "IPv4 remote address type", the packet filter component value field
shall be encoded as a sequence of a four octet IPv4 address field and a
four octet IPv4 address mask field. The IPv4 address field shall be
transmitted first. For "IPv4 local address type", the packet filter
component value field shall be encoded as defined for "IPv4 remote
address type".
"""
Same for the ToS which also includes a 1 byte mask value
* Fix deadlock caused by update_measurements calling in_sync
* Fix overlapping SRS condition
* Do not use shortened PUSCH in transmissions and retx from RAR
* Revert "Fix deadlock caused by update_measurements calling in_sync"
This reverts commit f58c8c8c766f8f95baa3a3bf8287d8e25b2057ba.
* Take into account CRS from neigbhour cells when measuring interference
* fix std::isnormal compilation
* Fixed compilation of test
* Address comments
* Remove unused overrides
* Make PHY non-blocking and fefactor HO procedure
* makes entire PHY non-blocking through command interface
* adds dedicated queue for cell_search/cell_select commands
* refactor HO procedure to run faster, in one stack cycle. Looks closer to the specs
* force ue to always apply SIB2 configuration during reestablishment
* Run update_measurements in all workers
Co-authored-by: Ismael Gomez <ismagom@gmail.com>
this was preventing that the Temp-CRNTI used in the RAR to be identical
to the currently configured C-RNTI of the UE.
The issue simply was that the RACH procedure was declared successful too
early, even before the Msg3 UL grant was filled with the Msg3 content.
The patch moves the logic that detects the successful completion of
the RACH procedure below the Msg3 packing.
* Removed magic numbers.
* Reduced indentation of statements with early exists.
* Removed elses after a return statement.
* Trimmed unnecessary include files.
* Default initialized members in the class.
we fix a number of very related issues for HO/reestablishment
in the success/error case:
* this patch removes the hard-coded check that intra-cell HO aren't
allowed. There are cases where eNBs use this method to update
the security context.
* the patch also fixes an issue after failed HO where the security context
of the source eNB should be used for the reestablishment.
* update security keys according to specs when mobilitycontrol
indicated change of key
the filter alpha was initialized to zero by default which causes an
issue because the first measurement for a cell can't be updated,
because the filtering function will always return the current value.
According to 36.331 Sec 5.5.3.2 Note 2, a k-value of 0 should turn
off filtering, which should be used as the default value until
an update is received from the network.
this rather large patch changes the way cells are handled in the SS.
It moves RLC and PDCP entities to the cell map of the SS, such that each cell
has its own entities. This allows to support HO operation, for example,
in which two cells need to send SRB messages.
It also extends most of the syssim interface to include the cell name
in all commands so they can be applied on the specified cell only.
stopping the UE in ZMQ mode caused a dead-lock because the Stack was
stopped before the PHY causing the sync queue to overflow. Since we
use a queue-length of 1 in ZMQ, mode, the PHY sync thread was blocking to
push a new sync event while the stack thread was already stopped.
this patch makes sure no new sync events are queued after the stack has
been terminated.
this patch fixes the UL BSR as per TS 36.321, it includes following
main changes:
* report UL buffer state to reflect the UEs transmit buffer after
the MAC UL PDU containing the BSR has been built.
In other words, if the UE, for example, can transmit all outstanding
data in an UL grant, it will not report any pending data to transmit.
* refactor MUX routines and subheader space calculation
* split existing BSR test into dedicated test for short, long, and trunc
BSR tests
* update MAC tests that include packing UL BSR.
(After checking TS 36.321 again it seems we have reported old UL buffer states)
simplify logic to check whether a BSR fits and, if so, which type.
before the check has been done in two places.
we now also accomodate for the CE subheader size.
we've not checked the return value when adding a new CE, like BSR or PHR,
for a UL MAC PDU. For very small UL grants, this could fail and
we need to remove the subheader again before packing the PDU.
This fixes issue #1649.
before the BSR was extracted but the actual index (between 0 and 63)
was not stored but directly converted into bytes.
for log parsing and debugging it is easier to follow the index
value. this patch therefore adds both values to the log message
and extends the API accordingly.
all calls that manipulate the RLC and/or PDCP arrays suffer
from a high deadlock risk if a PHY worker holds the RLC
AM Rx mutex at the same time when the stack wants to carry
out this reconfiguration.
this applies to RRC Reconfigs, but potentially also to RRC Connection
Reestablishment or even RRC Connection Setup, although this should
seldom be the case.
By breaking the call stack between RLC->PDCP->RRC->RCL and
carrying out the reconfig as a single task without holding the
RLC readlock the deadlock should not happen anymore.
This should fix issue #1593
- Import the srslog project into srslte.
- Ported srsue app to use the new logging framework.
- Implemented a wrapper that dispatches log entries to srslog.
- Renamed an existing log test to be more specific to avoid name clashes.
the PSS detection needs more temporary buffer than a full subframe.
we therefore need to allocate and initialize the sync object with
larger maximum size to support Scell search of large cells, e.g.
20 MHz
this fixes issue #1538
* add locked and unlocked version of has_data() since one is
called from stack and one from PHY threads
* add comments in each interface section as to why locking
is required or not
* remove RLC rwlock when not required
* move calls only used by RRC to RRC section
as 3400 or 2.685 GHz is on the edge of band 7, some phones won't connect
to a 20 MHz cell on this EARFCN.
In order to simplify testing with other bandwidths we change the default EARFCN.
this patch refactors the SDU queuing and dropping policy of the RLC and PDCP layer.
the previous design had issues when packets have been generated at a higher
rate above the PDCP than they could be consumed below the RLC.
When the RLC SDU queues were full, we allowed two policies, one to block on the write
and the other to drop the SDU. Both options are not ideal because they either
lead to a blocking stack thread or to lost PDCP PDUs.
To avoid this, this patch makes the following changes:
* PDCP monitors RLC's SDU queue and drops packets on its north-bound SAP if queues are full
* a new method sdu_queue_is_full() has been added to the RLC interface for PDCP
* remove blocking write from pdcp and rlc write_sdu() interface
* all writes into queues need to be non-blocking
* if Tx queues are overflowing, SDUs are dropped above PDCP, not RLC
* log warning if RLC still needs to drop SDUs
* this case should be avoided with the monitoring mechanism
Francisco Paisana
Andre Puschmann
Xavier Arteaga
Pedro Alvarez
faluco
Ismael Gomez
faluco
Sylvain Munaut
Daniel Willmann