> I don't understand. This callback will be called with data you need to
write
> to the network. In case of MTP Level3 you will need to wrap that around
the
> msgb you got.
I means: is the interaction with mtp3 layer implemented (is sending sccp
data by mtp3 implemented by the library?)?
Also, what about the reception of data from mtp3 layer. is that implemented
in the sccp lib.
I am asking these questions because I see the code of mtp3 in the lib but no
significant call is present in the sccp part of the lib.
Thank you for your help.
Hi all,
This patch set adds to libosmocore an optimized Viterbi decodeer for
architecture specific (Intel SSE) and non-specific cases. The
implementation covers codes with constraint lengths of K=5 and K=7 and
rates 1/4 to 3/4, which make up the majority of GSM use cases. Speedup
from the current implementation is in the range of 5 to 20 depending on
the processor and code type. API is unchanged.
Tested on Haswell (i7-4770K) and Atom (D2550). Additional test codes
from osmo-bts are included. Further tests for AWGN bit-error-rate
and benchmarks can be found in the following repository.
https://github.com/ttsou/osmo-conv-test
Here are some examples.
Bit error test for GPRS CS2 with SNR of 5 dB and 100000 bursts.
$ ./conv_test -c 2 -e -r 5 -i 100000
=================================================
[+] Testing: GPRS CS2
[.] Specs: (N=2, K=5, non-recursive, flushed, not punctured)
[.] Input length : ret = 290 exp = 290 -> OK
[.] Output length : ret = 588 exp = 588 -> OK
[.] BER tests:
[..] Testing base:
[..] Input BER.......................... 0.042443
[..] Output BER......................... 0.000006
[..] Output FER......................... 0.001350 (135)
[..] Testing SIMD:
[..] Input BER.......................... 0.042460
[..] Output BER......................... 0.000005
[..] Output FER......................... 0.001240 (124)
Timed AFS benchmark with 8 threads and 100000 bursts per thread.
$ ./conv_test -b -c 10 -j 8 -i 100000
=================================================
[+] Testing: GSM TCH/AFS 6.7
[.] Specs: (N=4, K=5, recursive, flushed, punctured)
[.] Input length : ret = 140 exp = 140 -> OK
[.] Output length : ret = 448 exp = 448 -> OK
[.] Performance benchmark:
[..] Encoding / Decoding 800000 bursts on 8 thread(s):
[..] Testing base:
[..] Elapsed time....................... 4.320001 secs
[..] Rate............................... 25.925920 Mbps
[..] Testing SIMD:
[..] Elapsed time....................... 0.458272 secs
[..] Rate............................... 244.396341 Mbps
[..] Speedup............................ 9.426718
-TT
Dear Sir
Is it possible to get the Network Measurement Reports (NMRs) (This report
comprises of Serving and neighboring cell-id , received signal strengths,
timing advance, time of arrival values etc) of a particular Number/IMSI
using OpenBSC. I am aware that we get these fields from the normal BSC.
Regards.
Ravi
Hi, I am using OsmoSGSN in topology with OpenGGSN and proprietary simulator
of BSS. There was a problem with an implementation of Network service,
cause Network Service implementation in the simulator of BSS is based on
different release of 3GPP standard (3GPP TS 48. 016 v7. 4. 0
(2008-04)/Network service (Release 7))...and the problem is that in
IP-subnetwork, which I am using there is no use for RESET or UNBLOCK
procedure, so I had to do a PATCH in gprs_ns.c, which was needed to
complete succesful connection between sim-bss and OsmoSGSN:
switch (nsh->pdu_type) {
case NS_PDUT_ALIVE:
+++ LOGP(DNS, LOGL_INFO, "Rx NS ALIVE\n");
+++ /*mark NS-VC as alive*/
+++ (*nsvc)->state = NSE_S_ALIVE;
+++ (*nsvc)->remote_state = NSE_S_ALIVE;
+++ /*initiate TEST procedure: Send ALIVE_ACK and start timer*/
+++ rc = gprs_ns_tx_simple((*nsvc), NS_PDUT_ALIVE_ACK);
+++ nsvc_start_timer((*nsvc), NSVC_TIMER_TNS_TEST);
+++ break;
.
.
.
}
another PATCH I needed to do was to change a little bit procedure for
allocation of P-TMSI in procedure uint32_t sgsn_alloc_ptmsi(void) in
gprs_sgsn.c
uint32_t sgsn_alloc_ptmsi(void)
{
struct sgsn_mm_ctx *mm;
uint32_t ptmsi;
restart:
+++ ptmsi = rand() | 0xc0000000; /*because of GPRS IMSI
ATTACH*/
llist_for_each_entry(mm, &sgsn_mm_ctxts, list) {
if (mm->p_tmsi == ptmsi)
goto restart;
}
return ptmsi;
}
because in GPRS IMSI ATTACH in message ATTACH COMPLETE (3GPP 24.008,
23.003, 48.018) there is new TLLI==new allocated P-TMSI and I need local
TLLI, so I had to do it this way
regards Michal
Hi,
When having a look at
http://discourse.criticalengineering.org/t/howto-gsm-base-station-with-the-b
eaglebone-black-debian-gnu-linux-and-a-usrp/56
I wonder if there is a way to use the osmo-trx with rangenetworks RAD1/SDR1
radio. I do not yet own an Ettus B210, so it would be fun using the
BeagleBone with the RAD1/SDR1, what is some shrinked and at the same time
extended USRP1 radio.
Ralph.
--
Ralph A. Schmid
Mondstr. 10
90762 Fürth
+49-171-3631223
ralph(a)schmid.xxx
http://www.bclog.de/
