Currently a locked cell is actively broadcasting when it is being
bootstrapped after the lock.
This patch adds an initial update of the RF mute state when the TRX
is initialized.
When the lchan was activated for handover configure it to wait
for a RACH burst. On release make sure to always release the
RACH SAPI (in case it has been allocated). On the first frame
inform handover.c about it and forward the received access burst
to the handover layer.
Using an E71 it was possible to make a handover for SDCCH and
TCH/F from a nanoBTS but also from itself to itself. The vty
commands of OpenBSC and the silent-call have been used for that.
I didn't verify audio handling so far.
The BTS layer needs to inform the handover code when an access
burst has been received. In turn the handover layer will ask the
bts to modify the channel, it will schedule the physical information
inform the BSC with the HANDOVER DETECTION and waits for the BTS
layer to inform it about the first received frame to stop a timer.
This patch implements merging of IMMEDIATE ASSIGN REJECT messages as
suggested in GSM 08.58, 5.7. When a new IMM.ASS.REJ is to be appended
to the AGCH queue and the last message in that queue is of the same
type, the individual entries (up to 4 per message) of both messages
are extracted, combined and stored back. If there are less than 5
entries, all entries fit into the old message and the new one is
discarded. Otherwise, the old message will contain 4 entries and the
remaining ones are stored into the new one which is then appended to
the queue.
Ticket: SYS#224
Sponsored-by: On-Waves ehf
This patch adds the following VTY commands to tune AGCH queue
handling:
agch-queue-management default
agch-queue-management threshold THRES low LOW high HIGH
Examples:
agch-queue-management default
Resets queue management to default parameters.
agch-queue-management threshold 0 low 25 high 75
Start dropping at 25%, drop all messages above 75% queue length
(relative to max queue length corresponding to T3126). Between
low and high, drop with a probability interpolated linearly
between 0 (low) and 1 (high).
agch-queue-management threshold 50 low 0 high 0
Start dropping at 50% and continue until all IMM.ASS.REJ have
been removed from the front (output) of the queue
Sponsored-by: On-Waves ehf
Currently, the AGCH queue length is not limited. This can lead to
large delays and network malfunction if there are many IMM.ASS.REJ
messages.
This patch adds two features:
- Don't accept msgs from the RSL layer when the queue is way too
full (safety measure, mainly if bts_ccch_copy_msg() is not being
called by the L1 layer, currently hard coded to 1000 messages)
- Selectively drop IMM.ASS.REJ from the queue output depending on the
queue length
Ticket: SYS#224
Sponsored-by: On-Waves ehf
This patch extends paging_gen_msg() by adding an output parameter
is_empty that is true, if only a paging message with dummy entries
has been placed into buffer. This feature is then used by
bts_ccch_copy_msg() to insert an AGCH message if is_empty is true.
Ticket: SYS#224
Sponsored-by: On-Waves ehf
Counters are added for the following events (use VTY show to query):
- Dropped IMMEDIATE ASSIGN REJECT messages
- Merged IMMEDIATE ASSIGN REJECT messages
- Rejected AGCH messages
- Use of PCH (non-reserved) for AGCH messages
- Use of AGCH (reserved) for AGCH messages
Sponsored-by: On-Waves ehf
This patch adds a function bts_update_agch_max_queue_length()
to compute a limit of the AGCH queue. This is based on the idea,
that the AGCH queue has a limited drain rate and that CHANNEL
REQUESTs must be answered within a certain time frame, given
by the minimum value of T3126 (see GSM 04.08). When the AGCH queue
reaches that limit, the last message would be delivered in time if
there were no other delays involved (which is not the case).
The calculation is based on the ratio of the number RACH slots and
CCCH blocks per time:
Lmax = (T + 2*S) / R_RACH * R_CCCH
where
T3126_min = (T + 2*S) / R_RACH
R_RACH is the RACH slot rate (e.g. RACHs per multiframe)
R_CCCH is the CCCH block rate (same time base like R_RACH)
The value depends control_channel_desc.ccch_conf and
rach_control.tx_integer (both from SYSINFO_TYPE_3) and should
therefore by called at least each time after one of these is changed.
For this reason, a signal callback is registered under
SS_GLOBAL/S_NEW_SYSINFO which invokes bts_update_agch_max_queue_length().
Sponsored-by: On-Waves ehf
Based-On: "bts: Calculate length of agch queue" by Ivan Kluchnikov
<kluchnikovi@gmail.com>
Before, this patch the program tried to read the info
of the temperature sensor from a wrong location.
Signed-off-by: Alvaro Neira Ayuso <anayuso@sysmocom.de>
This could lead to a BSC attempting to release the BCCH or a
PDCH. In the case of the BCCH this lead to a funny crash.
Log:
<0000> rsl.c:605 (bts=0,trx=0,ts=0,ss=4) Sending Connection Failure: cause = 0x01
<0000> rsl.c:1720 (bts=0,trx=0,ts=0,ss=0) Rx RSL DEACTIVATE_SACCH
Backtrace:
Program received signal SIGSEGV, Segmentation fault.
msgb_dequeue (queue=0x4007d2d8) at msgb.c:102
102 llist_del(lh);
(gdb) bt
#0 msgb_dequeue (queue=0x4007d2d8) at msgb.c:102
#1 0x4002ed28 in lapd_dl_flush_tx (dl=0x4007d220) at lapd_core.c:173
#2 0x40030cb4 in lapd_dl_reset (dl=0x4007d220) at lapd_core.c:307
#3 0x40030d00 in lapd_dl_exit (dl=0x4007d220) at lapd_core.c:321
#4 0x40033d80 in lapdm_entity_exit (le=<optimized out>) at lapdm.c:169
#5 0x40033d9c in lapdm_channel_exit (lc=0x4007d214) at lapdm.c:180
#6 0x0001a334 in rsl_tx_rf_rel_ack (lchan=0x4007d180) at rsl.c:505
#7 0x0000e908 in lchan_deactivate_sapis (lchan=0x4007d180) at oml.c:1427
#8 sapi_queue_exeute (lchan=0x4007d180) at oml.c:547
#9 0x0000ead0 in sapi_queue_send (lchan=<optimized out>) at oml.c:571
#10 queue_sapi_command (lchan=<optimized out>, cmd=<optimized out>)
at oml.c:609
#11 queue_sapi_command (lchan=0x4007d180, cmd=<optimized out>) at oml.c:601
#12 0x0000faf0 in enqueue_rel_marker (lchan=0x4007d180) at oml.c:1440
#13 lchan_deactivate (lchan=0x4007d180) at oml.c:1447
#14 0x0001004c in bts_model_rsl_chan_rel (lchan=<optimized out>) at oml.c:1647
#15 0x0001b948 in rsl_rx_rf_chan_rel (lchan=0x4007d180) at rsl.c:844
#16 rsl_rx_dchan (msg=0x75a88, trx=0x4007b038) at rsl.c:1727
#17 down_rsl (trx=0x4007b038, msg=0x75a88) at rsl.c:1853
#18 0x000154d4 in sign_link_cb (msg=<optimized out>) at abis.c:132
#19 0x400701c0 in ?? () from /usr/lib/libosmoabis.so.2
#20 0x400701c0 in ?? () from /usr/lib/libosmoabis.so.2
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
Fixes: OW#1133
When closing the PCU socket all channels will be closed. In that case
the LAPDm structures might not have been allocated. Mark the channel
as LCHAN_REL_ACT_PCU to avoid going through the RSL code for sending
the message. This avoids a crash when "gprs none" is selected but one
still configures a PDCH and then connects/disconnects the pcu.
#0 llist_del (entry=0x0) at ../include/osmocom/core/linuxlist.h:119
#1 msgb_dequeue (queue=0x400bbc58) at msgb.c:102
#2 0x40110d28 in lapd_dl_flush_tx (dl=0x400bbba0) at lapd_core.c:173
#3 0x40112cb4 in lapd_dl_reset (dl=0x400bbba0) at lapd_core.c:307
#4 0x40112d00 in lapd_dl_exit (dl=0x400bbba0) at lapd_core.c:321
#5 0x40115d80 in lapdm_entity_exit (le=<optimized out>) at lapdm.c:169
#6 0x40115d9c in lapdm_channel_exit (lc=0x400bbb94) at lapdm.c:180
#7 0x0001a334 in rsl_tx_rf_rel_ack (lchan=0x400bbb00) at rsl.c:505
#8 0x0000e908 in lchan_deactivate_sapis (lchan=0x400bbb00) at oml.c:1427
#9 sapi_queue_exeute (lchan=0x400bbb00) at oml.c:547
#10 0x0000ead0 in sapi_queue_send (lchan=<optimized out>) at oml.c:571
#11 queue_sapi_command (lchan=<optimized out>, cmd=<optimized out>) at oml.c:609
#12 queue_sapi_command (lchan=0x400bbb00, cmd=<optimized out>) at oml.c:601
#13 0x0000faf0 in enqueue_rel_marker (lchan=0x400bbb00) at oml.c:1440
#14 lchan_deactivate (lchan=0x400bbb00) at oml.c:1447
#15 0x0001004c in bts_model_rsl_chan_rel (lchan=<optimized out>) at oml.c:1647
#16 0x0001de30 in pcu_sock_close (state=0x62788) at pcu_sock.c:654
#17 0x0001e150 in pcu_sock_read (bfd=0x627a8) at pcu_sock.c:698
#18 pcu_sock_cb (bfd=0x627a8, flags=1) at pcu_sock.c:755
Currently, the DSP is always configured with u8NbrOfAgch = 1 before
SYSINFO type 3 is received. Thus using a different value for
BS_AG_BLKS_RES may lead to inconsistencies and MS failing to receive
paging messages properly.
This patch adds a warning and error logging and should be reverted
when initialisation is done in proper order.
Sponsored-by: On-Waves ehf
This patch adds a common function bts_ccch_copy_msg() that provides
and schedules AGCH and PCH messages. It is basically a frontend to
paging_gen_msg() and bts_agch_dequeue() and contains refactored code
from l1_if.c.
Sponsored-by: On-Waves ehf
Currently, the msg->data pointer is just set to the IMMEDIATE ASSIGN
message and the len is adjusted accordingly. Unfortunately, this
leaves l2h (pointing to the RSL header) and l3h (pointing to the
FULL_IMM_ASS_INFO IE) in an undefined state (outside of [data, tail]).
The code in bts.c accesses the message via msg->data.
This patch sets l3h and l2h correctly. msgb_l3() will point to the
start of the IMM ASS message and should be used instead of msg->data.
Sponsored-by: On-Waves ehf
This patch removes the local 'end' and 'exit' implementations (which
aren't used anyway) and uses the generic ones provided by libosmocore
instead, which are enabled automatically when vty_install_default()
is used.
The prompt strings are modified to match those in
libosmocore/openbsc.
Ticket: OW#952
Sponsored-by: On-Waves ehf
Use 0x52 as error cause as the nanoBTS is doing the same under the
situation. This has been spotted while testing handover using the
VTY command for handover.
Today we had the problem that multiple l1fwd-proxy instances ran
at the same time and not everything working all the time (some
packets were sent to a different host).
Another approach is to use flock on the message queues. This appears
to work fine as well.
Write the requested timing advance into the header. We are currently
using the u8AutoTA mode so the value will be overwritten by the DSP
before the bursts are sent to the MS.
When a frame is sent on the SACCH the LAPDm code will already
prepend two bytes for the tx_power and the ta. In the BTS we want
to use the values that were set by the BSC though. They currently
come from the RSL CHAN ACT but could also be set through the
RSL MS power control command. Update the comment as the space is
not empty.
At the 30C3 we had a NITB crash because of a RLL timeout on a
TCH/F. Jacob analyzed the problem and tracked it down to the
mismatch of LAPDm and the l1 interface to the DSP.
The sysmoBTS L1 has the TSC as a global value, we cannot have individual
per-timestamp or even per-lchan TSC, as the GSM specification would
suggest (and other BTSs support).
Rather than fail silently, write an error message to the log and
return NM_NACK_PARAM_RANGE or RSL_ERR_SERV_OPT_UNIMPL back to the BSC.
If the channel couldn't be activated, the function can simply return
a negated RSL_ERR_* constant which will then be propagated towards
the BSC in an CHAN_ACT_NACK RSL message.
This way, bts_model_check_oml() can return a negated NM_NACK_* constant
which will then be sent as cause value in the corresponding
SET_ATTR_NACK back to the BSC.
In the MPH ACTIVATE-RF.req, we need to specify the nominal maximum
transmit power, i.e. >= what we later request during MPH-INIT.req.
This field was first introduced in API version 2.2, but we never used
it so far. It may help fixing a bug related to excessive power
consumption of the sysmoBTS 2050.
Bind to port 3006 and listen to incoming IPA requests. Currently
we unconditionally respond with the MAC and IP Address of the unit.
To determine the IP Address the kernel is asked for thesource
address of the route for the destination. In contrast to a nanoBTS
we will reply to the port the initial request came from.
The sysmoBTS takes quite a bit of CPU time for the vfprintf that
is used by osmo_hexdump. Do not dump every single frame to improve
the performance a bit.
In the perf the ARM EABI ddiv operation showed up in the most
of expensive symbols. It doesn't really make much sense as the
calls should only be done on configuration.
Most timeslots do not have eight lchan. Use the subslots_per_lchan
map to reduce the number of iterations. Looking at the ARM assembly
showed that no loop-unrolling was done so this could be a speed up.
calib_file.c: In function 'next_calib_file_idx':
calib_file.c:126:3: warning: implicit declaration of function 'band_femto2osmo' [-Wimplicit-function-declaration]
Release/Free the lapdm resources _after_ the channel has
been fully released. Do not forward data unless the lchan
is in the active state.
Reading this code again, there is probably a memory leak for
everytime the PCU will re-connect to the BTS.
(gdb) p lchan->state
$4 = LCHAN_S_REL_REQ
(gdb) bt
#0 lapd_dl_flush_hist (dl=0x40454894) at lapd_core.c:164
#1 0x44873b54 in lapd_rx_u (lctx=0xbe9bd5a8, msg=0x92f90) at lapd_core.c:1040
#2 lapd_ph_data_ind (msg=0x92f90, lctx=0xbe9bd5a8) at lapd_core.c:1644
#3 0x44876d50 in l2_ph_data_ind (link_id=<optimized out>, chan_nr=<optimized out>,
le=<optimized out>, msg=0x92f90) at lapdm.c:637
#4 lapdm_phsap_up (oph=<optimized out>, le=<optimized out>) at lapdm.c:707
#5 0x0000c504 in handle_ph_data_ind (l1p_msg=0x97358, data_ind=0x97420, fl1=<optimized out>)
at l1_if.c:774
#6 l1if_handle_ind (fl1=<optimized out>, msg=0x97358) at l1_if.c:892
Use the lchan->rel_act_kind field for the BCCH activatiob by OML.
The lchan's should be marked as active but no event should be sent to
the BSC. This is mostly like the PCU. We can now remove the secnd
argument from lchan_activate.
Holger Hans Peter Freyther
Harald Welte