Merged uplink-decoding branch (with complete support for control channels decoding on uplink)
# Conflicts:
# examples
# lib/demapping/universal_ctrl_chans_demapper_impl.cc
# lib/receiver/receiver_impl.cc
diff --git a/lib/demapping/universal_ctrl_chans_demapper_impl.cc b/lib/demapping/universal_ctrl_chans_demapper_impl.cc
index c711928..cbbbc32 100644
--- a/lib/demapping/universal_ctrl_chans_demapper_impl.cc
+++ b/lib/demapping/universal_ctrl_chans_demapper_impl.cc
@@ -36,16 +36,16 @@
namespace gsm {
universal_ctrl_chans_demapper::sptr
- universal_ctrl_chans_demapper::make(unsigned int timeslot_nr, const std::vector<int> &starts_fn_mod51, const std::vector<int> &channel_types)
+ universal_ctrl_chans_demapper::make(unsigned int timeslot_nr, const std::vector<int> &downlink_starts_fn_mod51, const std::vector<int> &downlink_channel_types, const std::vector<int> &uplink_starts_fn_mod51, const std::vector<int> &uplink_channel_types)
{
return gnuradio::get_initial_sptr
- (new universal_ctrl_chans_demapper_impl(timeslot_nr, starts_fn_mod51, channel_types));
+ (new universal_ctrl_chans_demapper_impl(timeslot_nr, downlink_starts_fn_mod51, downlink_channel_types, uplink_starts_fn_mod51, uplink_channel_types));
}
/*
* The private constructor
*/
- universal_ctrl_chans_demapper_impl::universal_ctrl_chans_demapper_impl(unsigned int timeslot_nr, const std::vector<int> &starts_fn_mod51, const std::vector<int> &channel_types)
+ universal_ctrl_chans_demapper_impl::universal_ctrl_chans_demapper_impl(unsigned int timeslot_nr, const std::vector<int> &downlink_starts_fn_mod51, const std::vector<int> &downlink_channel_types, const std::vector<int> &uplink_starts_fn_mod51, const std::vector<int> &uplink_channel_types)
: gr::block("universal_ctrl_chans_demapper",
gr::io_signature::make(0, 0, 0),
gr::io_signature::make(0, 0, 0)),
@@ -56,75 +56,137 @@
for(int ii=0; ii<51; ii++)
{
- d_starts_fn_mod51[ii]=0;
- d_channel_types[ii]=0;
- d_subslots[ii] = 0;
- d_subslots[ii+51] = 0;
+ d_downlink_starts_fn_mod51[ii]=0;
+ d_downlink_channel_types[ii]=0;
+ d_downlink_subslots[ii] = 0;
+ d_downlink_subslots[ii+51] = 0;
+
+ d_uplink_starts_fn_mod51[ii]=0;
+ d_uplink_channel_types[ii]=0;
+ d_uplink_subslots[ii] = 0;
+ d_uplink_subslots[ii+51] = 0;
}
std::vector<int>::const_iterator s;
std::vector<int>::const_iterator ch_type;
- for(s=starts_fn_mod51.begin(), ch_type=channel_types.begin();s != starts_fn_mod51.end(); s++)
+ for(s=downlink_starts_fn_mod51.begin(), ch_type=downlink_channel_types.begin();s != downlink_starts_fn_mod51.end(); s++)
{
if((*s >= 0) and (*s <= (51-4)))
{
for(int ii=0; ii<4; ii++){
- d_starts_fn_mod51[*s+ii] = *s;
- if(ch_type!=channel_types.end())
+ d_downlink_starts_fn_mod51[*s+ii] = *s;
+ if(ch_type!=downlink_channel_types.end())
{
- d_channel_types[*s+ii] = *ch_type;
+ d_downlink_channel_types[*s+ii] = *ch_type;
}
}
- if(ch_type!=channel_types.end())
+ if(ch_type!=downlink_channel_types.end())
{
ch_type++;
}
}
}
- std::set<int> distinct_channels(channel_types.begin(), channel_types.end());
- std::set<int>::iterator it;
- unsigned int subslot;
-
- for (it=distinct_channels.begin(); it != distinct_channels.end(); it++)
- {
- subslot = 0;
- for(s=starts_fn_mod51.begin();s != starts_fn_mod51.end(); s++)
- {
- if ((d_channel_types[*s] == *it) and (*s >= 0) and (*s <= (51-4)))
- {
- for(int ii=0; ii<4; ii++)
- {
- d_subslots[*s+ii] = subslot;
- d_subslots[*s+ii+51] = subslot;
- }
- subslot++;
- }
- }
-
- if (*it == GSMTAP_CHANNEL_ACCH or
- *it == (GSMTAP_CHANNEL_ACCH|GSMTAP_CHANNEL_SDCCH) or
- *it == (GSMTAP_CHANNEL_ACCH|GSMTAP_CHANNEL_SDCCH4) or
- *it == (GSMTAP_CHANNEL_ACCH|GSMTAP_CHANNEL_SDCCH8) or
- *it == (GSMTAP_CHANNEL_ACCH|GSMTAP_CHANNEL_TCH_F) or
- *it == (GSMTAP_CHANNEL_ACCH|GSMTAP_CHANNEL_TCH_H)
- )
- {
- for(s=starts_fn_mod51.begin();s != starts_fn_mod51.end(); s++)
- {
- if ((d_channel_types[*s] == *it) and (*s >= 0) and (*s <= (51-4)))
- {
- for(int ii=0; ii<4; ii++)
- {
- d_subslots[*s+ii+51] = subslot;
- }
- subslot++;
- }
- }
- }
- }
+ for(s=uplink_starts_fn_mod51.begin(), ch_type=uplink_channel_types.begin();s != uplink_starts_fn_mod51.end(); s++)
+ {
+ if((*s >= 0) and (*s <= (51-4)))
+ {
+ for(int ii=0; ii<4; ii++){
+ d_uplink_starts_fn_mod51[*s+ii] = *s;
+ if(ch_type!=uplink_channel_types.end())
+ {
+ d_uplink_channel_types[*s+ii] = *ch_type;
+ }
+ }
+ if(ch_type!=uplink_channel_types.end())
+ {
+ ch_type++;
+ }
+ }
+ }
+ std::set<int> distinct_downlink_channels(downlink_channel_types.begin(), downlink_channel_types.end());
+ std::set<int>::iterator it;
+ unsigned int subslot;
+
+ for (it=distinct_downlink_channels.begin(); it != distinct_downlink_channels.end(); it++)
+ {
+ subslot = 0;
+ for(s=downlink_starts_fn_mod51.begin();s != downlink_starts_fn_mod51.end(); s++)
+ {
+ if ((d_downlink_channel_types[*s] == *it) and (*s >= 0) and (*s <= (51-4)))
+ {
+ for(int ii=0; ii<4; ii++)
+ {
+ d_downlink_subslots[*s+ii] = subslot;
+ d_downlink_subslots[*s+ii+51] = subslot;
+ }
+ subslot++;
+ }
+ }
+
+ if (*it == GSMTAP_CHANNEL_ACCH or
+ *it == (GSMTAP_CHANNEL_ACCH|GSMTAP_CHANNEL_SDCCH) or
+ *it == (GSMTAP_CHANNEL_ACCH|GSMTAP_CHANNEL_SDCCH4) or
+ *it == (GSMTAP_CHANNEL_ACCH|GSMTAP_CHANNEL_SDCCH8) or
+ *it == (GSMTAP_CHANNEL_ACCH|GSMTAP_CHANNEL_TCH_F) or
+ *it == (GSMTAP_CHANNEL_ACCH|GSMTAP_CHANNEL_TCH_H)
+ )
+ {
+ for(s=downlink_starts_fn_mod51.begin();s != downlink_starts_fn_mod51.end(); s++)
+ {
+ if ((d_downlink_channel_types[*s] == *it) and (*s >= 0) and (*s <= (51-4)))
+ {
+ for(int ii=0; ii<4; ii++)
+ {
+ d_downlink_subslots[*s+ii+51] = subslot;
+ }
+ subslot++;
+ }
+ }
+ }
+ }
+
+ std::set<int> distinct_uplink_channels(uplink_channel_types.begin(), uplink_channel_types.end());
+ for (it=distinct_uplink_channels.begin(); it != distinct_uplink_channels.end(); it++)
+ {
+ subslot = 0;
+ for(s=uplink_starts_fn_mod51.begin();s != uplink_starts_fn_mod51.end(); s++)
+ {
+ if ((d_uplink_channel_types[*s] == *it) and (*s >= 0) and (*s <= (51-4)))
+ {
+ for(int ii=0; ii<4; ii++)
+ {
+ d_uplink_subslots[*s+ii] = subslot;
+ d_uplink_subslots[*s+ii+51] = subslot;
+ }
+ subslot++;
+ }
+ }
+
+ if (*it == GSMTAP_CHANNEL_ACCH or
+ *it == (GSMTAP_CHANNEL_ACCH|GSMTAP_CHANNEL_SDCCH) or
+ *it == (GSMTAP_CHANNEL_ACCH|GSMTAP_CHANNEL_SDCCH4) or
+ *it == (GSMTAP_CHANNEL_ACCH|GSMTAP_CHANNEL_SDCCH8) or
+ *it == (GSMTAP_CHANNEL_ACCH|GSMTAP_CHANNEL_TCH_F) or
+ *it == (GSMTAP_CHANNEL_ACCH|GSMTAP_CHANNEL_TCH_H)
+ )
+ {
+ for(s=uplink_starts_fn_mod51.begin();s != uplink_starts_fn_mod51.end(); s++)
+ {
+ if ((d_uplink_channel_types[*s] == *it) and (*s >= 0) and (*s <= (51-4)))
+ {
+ for(int ii=0; ii<4; ii++)
+ {
+ d_uplink_subslots[*s+ii+51] = subslot;
+ }
+ subslot++;
+ }
+ }
+ }
+ }
+
message_port_register_in(pmt::mp("bursts"));
set_msg_handler(pmt::mp("bursts"), boost::bind(&universal_ctrl_chans_demapper_impl::filter_ctrl_chans, this, _1));
@@ -142,52 +204,102 @@
{
pmt::pmt_t header_plus_burst = pmt::cdr(msg);
gsmtap_hdr * header = (gsmtap_hdr *)pmt::blob_data(header_plus_burst);
-
+
uint32_t frame_nr = be32toh(header->frame_number);
uint32_t fn_mod51 = frame_nr % 51;
- uint32_t fn51_start = d_starts_fn_mod51[fn_mod51];
- uint32_t fn51_stop = fn51_start + 3;
- uint32_t ch_type = d_channel_types[fn_mod51];
+ bool uplink_burst = (be16toh(header->arfcn) & 0x4000) ? true : false;
+
if(header->timeslot==d_timeslot){
int8_t new_msg[sizeof(gsmtap_hdr)+BURST_SIZE];
gsmtap_hdr * new_hdr = (gsmtap_hdr*)new_msg;
memcpy(new_msg, header, sizeof(gsmtap_hdr)+BURST_SIZE);
- new_hdr->sub_type = ch_type;
- new_hdr->sub_slot = d_subslots[fn_mod51 + (51 * (frame_nr % 2))];
pmt::pmt_t msg_binary_blob = pmt::make_blob(new_msg,sizeof(gsmtap_hdr)+BURST_SIZE);
pmt::pmt_t msg_out = pmt::cons(pmt::PMT_NIL, msg_binary_blob);
- if(fn_mod51>=fn51_start && fn_mod51<=fn51_stop)
+ if(uplink_burst)
{
- uint32_t ii = fn_mod51 - fn51_start;
- d_frame_numbers[ii] = frame_nr;
- d_bursts[ii] = msg_out;
- }
-
- if(fn_mod51==fn51_stop)
- {
- //check for a situation where some bursts were lost
- //in this situation frame numbers won't be consecutive
- bool frames_are_consecutive = true;
- for(int jj=1; jj<4; jj++)
+ uint32_t fn51_start = d_uplink_starts_fn_mod51[fn_mod51];
+ uint32_t fn51_stop = fn51_start + 3;
+ uint32_t ch_type = d_uplink_channel_types[fn_mod51];
+
+ if(ch_type != 0)
{
- if((d_frame_numbers[jj]-d_frame_numbers[jj-1])!=1)
- {
- frames_are_consecutive = false;
- }
+ new_hdr->sub_type = ch_type;
}
- if(frames_are_consecutive)
+ new_hdr->sub_slot = d_uplink_subslots[fn_mod51 + (51 * (frame_nr % 2))];
+
+ if(fn_mod51>=fn51_start && fn_mod51<=fn51_stop)
{
- //send bursts to the output
- for(int jj=0; jj<4; jj++)
+ uint32_t ii = fn_mod51 - fn51_start;
+ d_uplink_frame_numbers[ii] = frame_nr;
+ d_uplink_bursts[ii] = msg_out;
+ }
+
+ if(fn_mod51==fn51_stop)
+ {
+ //check for a situation where some bursts were lost
+ //in this situation frame numbers won't be consecutive
+ bool frames_are_consecutive = true;
+ for(int jj=1; jj<4; jj++)
{
- message_port_pub(pmt::mp("bursts"), d_bursts[jj]);
+ if((d_uplink_frame_numbers[jj]-d_uplink_frame_numbers[jj-1])!=1)
+ {
+ frames_are_consecutive = false;
+ }
}
- }
+ if(frames_are_consecutive)
+ {
+ //send bursts to the output
+ for(int jj=0; jj<4; jj++)
+ {
+ message_port_pub(pmt::mp("bursts"), d_uplink_bursts[jj]);
+ }
+ }
+ }
+ }
+ else
+ {
+ uint32_t fn51_start = d_downlink_starts_fn_mod51[fn_mod51];
+ uint32_t fn51_stop = fn51_start + 3;
+ uint32_t ch_type = d_downlink_channel_types[fn_mod51];
+
+ if(ch_type != 0)
+ {
+ new_hdr->sub_type = ch_type;
+ }
+ new_hdr->sub_slot = d_downlink_subslots[fn_mod51 + (51 * (frame_nr % 2))];
+
+ if(fn_mod51>=fn51_start && fn_mod51<=fn51_stop)
+ {
+ uint32_t ii = fn_mod51 - fn51_start;
+ d_downlink_frame_numbers[ii] = frame_nr;
+ d_downlink_bursts[ii] = msg_out;
+ }
+
+ if(fn_mod51==fn51_stop)
+ {
+ //check for a situation where some bursts were lost
+ //in this situation frame numbers won't be consecutive
+ bool frames_are_consecutive = true;
+ for(int jj=1; jj<4; jj++)
+ {
+ if((d_downlink_frame_numbers[jj]-d_downlink_frame_numbers[jj-1])!=1)
+ {
+ frames_are_consecutive = false;
+ }
+ }
+ if(frames_are_consecutive)
+ {
+ //send bursts to the output
+ for(int jj=0; jj<4; jj++)
+ {
+ message_port_pub(pmt::mp("bursts"), d_downlink_bursts[jj]);
+ }
+ }
+ }
}
}
}
} /* namespace gsm */
} /* namespace gr */
-
diff --git a/lib/demapping/universal_ctrl_chans_demapper_impl.h b/lib/demapping/universal_ctrl_chans_demapper_impl.h
index d4e1440..0316bf4 100644
--- a/lib/demapping/universal_ctrl_chans_demapper_impl.h
+++ b/lib/demapping/universal_ctrl_chans_demapper_impl.h
@@ -32,14 +32,19 @@
class universal_ctrl_chans_demapper_impl : public universal_ctrl_chans_demapper
{
private:
- unsigned int d_starts_fn_mod51[51];
- unsigned int d_channel_types[51];
- unsigned int d_subslots[102];
+ unsigned int d_downlink_starts_fn_mod51[51];
+ unsigned int d_uplink_starts_fn_mod51[51];
+ unsigned int d_downlink_channel_types[51];
+ unsigned int d_uplink_channel_types[51];
+ unsigned int d_downlink_subslots[102];
+ unsigned int d_uplink_subslots[102];
unsigned int d_timeslot;
- uint32_t d_frame_numbers[4];
- pmt::pmt_t d_bursts[4];
+ uint32_t d_downlink_frame_numbers[4];
+ uint32_t d_uplink_frame_numbers[4];
+ pmt::pmt_t d_downlink_bursts[4];
+ pmt::pmt_t d_uplink_bursts[4];
public:
- universal_ctrl_chans_demapper_impl(unsigned int timeslot_nr, const std::vector<int> &starts_fn_mod51, const std::vector<int> &channel_types);
+ universal_ctrl_chans_demapper_impl(unsigned int timeslot_nr, const std::vector<int> &downlink_starts_fn_mod51, const std::vector<int> &downlink_channel_types, const std::vector<int> &uplink_starts_fn_mod51, const std::vector<int> &uplink_channel_types);
~universal_ctrl_chans_demapper_impl();
void filter_ctrl_chans(pmt::pmt_t msg);
diff --git a/lib/receiver/receiver_config.cc b/lib/receiver/receiver_config.cc
index c8b85c7..0abf200 100644
--- a/lib/receiver/receiver_config.cc
+++ b/lib/receiver/receiver_config.cc
@@ -46,6 +46,33 @@
return (*this);
}
+burst_counter burst_counter::subtract_timeslots(unsigned int number_of_timeslots)
+{
+ int timeslot_nr = (int)d_timeslot_nr - (int)number_of_timeslots;
+ int t1,t2,t3;
+ if (timeslot_nr < 0) {
+ timeslot_nr = timeslot_nr + 8;
+
+ t2 = (d_t2 - 1) % 26;
+ t3 = (d_t3 - 1) % 51;
+
+ if ((d_t2 == 0) && (d_t3 == 0)) {
+ t1 = (d_t1 - 1) % (1 << 11);
+ } else
+ {
+ t1 = d_t1;
+ }
+ }
+ else
+ {
+ t1 = d_t1;
+ t2 = d_t2;
+ t3 = d_t3;
+ }
+
+ return burst_counter(d_OSR, t1, t2, t3, timeslot_nr);
+}
+
void burst_counter::set(uint32_t t1, uint32_t t2, uint32_t t3, uint32_t timeslot_nr)
{
d_t1 = t1;
diff --git a/lib/receiver/receiver_config.h b/lib/receiver/receiver_config.h
index 496e1fe..17b98c8 100644
--- a/lib/receiver/receiver_config.h
+++ b/lib/receiver/receiver_config.h
@@ -89,12 +89,14 @@
d_t3(t3),
d_timeslot_nr(timeslot_nr),
d_offset_fractional(0.0),
- d_offset_integer(0.0) {
+ d_offset_integer(0.0)
+ {
d_offset_integer = 0;
d_offset_fractional = 0;
}
burst_counter & operator++(int);
+ burst_counter subtract_timeslots(unsigned int number_of_timeslots);
void set(uint32_t t1, uint32_t t2, uint32_t t3, uint32_t timeslot_nr);
uint32_t get_t1() {
diff --git a/lib/receiver/receiver_impl.cc b/lib/receiver/receiver_impl.cc
index bd2b306..09a3703 100644
--- a/lib/receiver/receiver_impl.cc
+++ b/lib/receiver/receiver_impl.cc
@@ -52,20 +52,21 @@
namespace gsm
{
receiver::sptr
-receiver::make(int osr, const std::vector<int> &cell_allocation, const std::vector<int> &tseq_nums)
+receiver::make(int osr, const std::vector<int> &cell_allocation, const std::vector<int> &tseq_nums, bool process_uplink)
{
return gnuradio::get_initial_sptr
- (new receiver_impl(osr, cell_allocation, tseq_nums));
+ (new receiver_impl(osr, cell_allocation, tseq_nums, process_uplink));
}
/*
* The private constructor
*/
-receiver_impl::receiver_impl(int osr, const std::vector<int> &cell_allocation, const std::vector<int> &tseq_nums)
+receiver_impl::receiver_impl(int osr, const std::vector<int> &cell_allocation, const std::vector<int> &tseq_nums, bool process_uplink)
: gr::sync_block("receiver",
gr::io_signature::make(1, -1, sizeof(gr_complex)),
gr::io_signature::make(0, 0, 0)),
d_OSR(osr),
+ d_process_uplink(process_uplink),
d_chan_imp_length(CHAN_IMP_RESP_LENGTH),
d_counter(0),
d_fcch_start_pos(0),
@@ -172,7 +173,7 @@
{
burst_start = get_sch_chan_imp_resp(input, &channel_imp_resp[0]); //get channel impulse response from it
detect_burst(input, &channel_imp_resp[0], burst_start, output_binary); //detect bits using MLSE detection
- if (decode_sch(&output_binary[3], &t1, &t2, &t3, &d_ncc, &d_bcc) == 0) //decode SCH burst
+ if (decode_sch(&output_binary[3], &t1, &t2, &t3, &d_ncc, &d_bcc) == 0) //decode SCH burst
{
d_burst_nr.set(t1, t2, t3, 0); //set counter of bursts value
d_burst_nr++;
@@ -198,10 +199,15 @@
int offset = 0;
int to_consume = 0;
unsigned char output_binary[BURST_SIZE];
-
burst_type b_type;
+ unsigned int inputs_to_process=d_cell_allocation.size();
- for(int input_nr=0; input_nr<d_cell_allocation.size(); input_nr++)
+ if(d_process_uplink)
+ {
+ inputs_to_process = 2*inputs_to_process;
+ }
+
+ for(int input_nr=0; input_nr<inputs_to_process; input_nr++)
{
double signal_pwr = 0;
input = (gr_complex *)input_items[input_nr];
@@ -827,10 +833,21 @@
tap_header->version = GSMTAP_VERSION;
tap_header->hdr_len = sizeof(gsmtap_hdr)/4;
tap_header->type = GSMTAP_TYPE_UM_BURST;
- tap_header->timeslot = static_cast<uint8_t>(d_burst_nr.get_timeslot_nr());
- tap_header->frame_number = htobe32(d_burst_nr.get_frame_nr());
tap_header->sub_type = burst_type;
- tap_header->arfcn = htobe16(d_cell_allocation[input_nr]) ;
+ bool uplink_burst = (input_nr >= d_cell_allocation.size());
+ if(!uplink_burst) // downlink burst
+ {
+ tap_header->timeslot = static_cast<uint8_t>(d_burst_nr.get_timeslot_nr());
+ tap_header->frame_number = htobe32(d_burst_nr.get_frame_nr());
+ tap_header->arfcn = htobe16(d_cell_allocation[input_nr]) ;
+ }
+ else //uplink burst
+ {
+ tap_header->timeslot = static_cast<uint8_t>(d_burst_nr.subtract_timeslots(3).get_timeslot_nr());
+ tap_header->frame_number = htobe32(d_burst_nr.subtract_timeslots(3).get_frame_nr());
+ input_nr = input_nr - d_cell_allocation.size();
+ tap_header->arfcn = htobe16(d_cell_allocation[input_nr] | 0x4000);
+ }
tap_header->signal_dbm = static_cast<int8_t>(d_signal_dbm);
tap_header->snr_db = 0;
diff --git a/lib/receiver/receiver_impl.h b/lib/receiver/receiver_impl.h
index d668e14..c8d71f9 100644
--- a/lib/receiver/receiver_impl.h
+++ b/lib/receiver/receiver_impl.h
@@ -39,6 +39,7 @@
/**@name Configuration of the receiver */
//@{
const int d_OSR; ///< oversampling ratio
+ bool d_process_uplink;
const int d_chan_imp_length; ///< channel impulse length
float d_signal_dbm;
std::vector<int> d_tseq_nums; ///< stores training sequence numbers for channels different than C0
@@ -203,7 +204,7 @@
public:
- receiver_impl(int osr, const std::vector<int> &cell_allocation, const std::vector<int> &tseq_nums);
+ receiver_impl(int osr, const std::vector<int> &cell_allocation, const std::vector<int> &tseq_nums, bool process_uplink);
~receiver_impl();
int work(int noutput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items);