transceiver: Add an option to emulate a RACH delay in random filler mode.
Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
diff --git a/Transceiver52M/Transceiver.cpp b/Transceiver52M/Transceiver.cpp
index c7f484b..cb191d5 100644
--- a/Transceiver52M/Transceiver.cpp
+++ b/Transceiver52M/Transceiver.cpp
@@ -71,7 +71,7 @@
}
}
-bool TransceiverState::init(int filler, size_t sps, float scale, size_t rtsc)
+bool TransceiverState::init(int filler, size_t sps, float scale, size_t rtsc, unsigned rach_delay)
{
signalVector *burst;
@@ -91,7 +91,7 @@
burst = generateEdgeBurst(rtsc);
break;
case Transceiver::FILLER_ACCESS_RAND:
- burst = genRandAccessBurst(sps, n);
+ burst = genRandAccessBurst(rach_delay, sps, n);
break;
case Transceiver::FILLER_ZERO:
default:
@@ -160,7 +160,7 @@
* are still expected to report clock indications through control channel
* activity.
*/
-bool Transceiver::init(int filler, size_t rtsc)
+bool Transceiver::init(int filler, size_t rtsc, unsigned rach_delay)
{
int d_srcport, d_dstport, c_srcport, c_dstport;
@@ -216,7 +216,7 @@
if (i && filler == FILLER_DUMMY)
filler = FILLER_ZERO;
- mStates[i].init(filler, mSPSTx, txFullScale, rtsc);
+ mStates[i].init(filler, mSPSTx, txFullScale, rtsc, rach_delay);
}
return true;
diff --git a/Transceiver52M/Transceiver.h b/Transceiver52M/Transceiver.h
index 99db34d..f6f4526 100644
--- a/Transceiver52M/Transceiver.h
+++ b/Transceiver52M/Transceiver.h
@@ -54,7 +54,7 @@
~TransceiverState();
/* Initialize a multiframe slot in the filler table */
- bool init(int filler, size_t sps, float scale, size_t rtsc);
+ bool init(int filler, size_t sps, float scale, size_t rtsc, unsigned rach_delay);
int chanType[8];
@@ -107,7 +107,7 @@
~Transceiver();
/** Start the control loop */
- bool init(int filler, size_t rtsc);
+ bool init(int filler, size_t rtsc, unsigned rach_delay);
/** attach the radioInterface receive FIFO */
bool receiveFIFO(VectorFIFO *wFIFO, size_t chan)
diff --git a/Transceiver52M/osmo-trx.cpp b/Transceiver52M/osmo-trx.cpp
index d56b5c6..f4b585e 100644
--- a/Transceiver52M/osmo-trx.cpp
+++ b/Transceiver52M/osmo-trx.cpp
@@ -70,6 +70,7 @@
unsigned rx_sps;
unsigned chans;
unsigned rtsc;
+ unsigned rach_delay;
bool extref;
Transceiver::FillerType filler;
bool diversity;
@@ -265,7 +266,7 @@
trx = new Transceiver(config->port, config->addr.c_str(),
config->tx_sps, config->rx_sps, config->chans,
GSM::Time(3,0), radio, config->rssi_offset);
- if (!trx->init(config->filler, config->rtsc)) {
+ if (!trx->init(config->filler, config->rtsc, config->rach_delay)) {
LOG(ALERT) << "Failed to initialize transceiver";
delete trx;
return NULL;
@@ -317,8 +318,8 @@
" -c Number of ARFCN channels (default=1)\n"
" -f Enable C0 filler table\n"
" -o Set baseband frequency offset (default=auto)\n"
- " -r Random burst test mode with TSC\n"
- " -A Random burst test mode with Access Bursts\n"
+ " -r Random Normal Burst test mode with TSC\n"
+ " -A Random Access Burst test mode with delay\n"
" -R RSSI to dBm offset in dB (default=0)\n"
" -S Swap channels (UmTRX only)\n",
"EMERG, ALERT, CRT, ERR, WARNING, NOTICE, INFO, DEBUG");
@@ -333,6 +334,7 @@
config->rx_sps = DEFAULT_RX_SPS;
config->chans = DEFAULT_CHANS;
config->rtsc = 0;
+ config->rach_delay = 0;
config->extref = false;
config->filler = Transceiver::FILLER_ZERO;
config->diversity = false;
@@ -341,7 +343,7 @@
config->swap_channels = false;
config->edge = false;
- while ((option = getopt(argc, argv, "ha:l:i:p:c:dxfo:s:r:AR:Se")) != -1) {
+ while ((option = getopt(argc, argv, "ha:l:i:p:c:dxfo:s:r:A:R:Se")) != -1) {
switch (option) {
case 'h':
print_help();
@@ -382,6 +384,7 @@
config->filler = Transceiver::FILLER_NORM_RAND;
break;
case 'A':
+ config->rach_delay = atoi(optarg);
config->filler = Transceiver::FILLER_ACCESS_RAND;
break;
case 'R':
@@ -420,6 +423,12 @@
print_help();
exit(0);
}
+
+ if (config->rach_delay > 68) {
+ printf("RACH delay is too big %i\n\n", config->rach_delay);
+ print_help();
+ exit(0);
+ }
}
int main(int argc, char *argv[])
diff --git a/Transceiver52M/sigProcLib.cpp b/Transceiver52M/sigProcLib.cpp
index 434bbaf..477449f 100644
--- a/Transceiver52M/sigProcLib.cpp
+++ b/Transceiver52M/sigProcLib.cpp
@@ -1017,30 +1017,36 @@
/*
* Generate a random GSM access burst.
*/
-signalVector *genRandAccessBurst(int sps, int tn)
+signalVector *genRandAccessBurst(int delay, int sps, int tn)
{
if ((tn < 0) || (tn > 7))
return NULL;
if ((sps != 1) && (sps != 4))
return NULL;
+ if (delay > 68)
+ return NULL;
int i = 0;
- BitVector *bits = new BitVector(88);
+ BitVector *bits = new BitVector(88+delay);
signalVector *burst;
+ /* delay */
+ for (; i < delay; i++)
+ (*bits)[i] = 0;
+
/* head and synch bits */
- for (int n = 0; i < 49; i++, n++)
+ for (int n = 0; i < 49+delay; i++, n++)
(*bits)[i] = gRACHBurst[n];
/* Random bits */
- for (; i < 85; i++)
+ for (; i < 85+delay; i++)
(*bits)[i] = rand() % 2;
/* Tail bits */
- for (; i < 88; i++)
+ for (; i < 88+delay; i++)
(*bits)[i] = 0;
- int guard = 68 + !(tn % 4);
+ int guard = 68-delay + !(tn % 4);
burst = modulateBurst(*bits, guard, sps);
delete bits;
diff --git a/Transceiver52M/sigProcLib.h b/Transceiver52M/sigProcLib.h
index 7af58e7..b4aee93 100644
--- a/Transceiver52M/sigProcLib.h
+++ b/Transceiver52M/sigProcLib.h
@@ -123,7 +123,7 @@
signalVector *genRandNormalBurst(int tsc, int sps, int tn);
/** Generate an access GSM burst with random payload - 4 or 1 SPS */
-signalVector *genRandAccessBurst(int sps, int tn);
+signalVector *genRandAccessBurst(int delay, int sps, int tn);
/** Generate a dummy GSM burst - 4 or 1 SPS */
signalVector *generateDummyBurst(int sps, int tn);