183 lines
8.0 KiB
C++
183 lines
8.0 KiB
C++
/* -*- c++ -*- */
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/*
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* @file
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* @author (C) 2016 by Piotr Krysik <ptrkrysik@gmail.com>
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* @section LICENSE
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*
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* Gr-gsm is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* Gr-gsm is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with gr-gsm; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gnuradio/io_signature.h>
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#include "universal_ctrl_chans_demapper_impl.h"
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#include <grgsm/endian.h>
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#include <grgsm/gsmtap.h>
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#include <set>
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#define BURST_SIZE 148
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namespace gr {
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namespace gsm {
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universal_ctrl_chans_demapper::sptr
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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> &downlink_subslots, const std::vector<int> &uplink_starts_fn_mod51, const std::vector<int> &uplink_channel_types, const std::vector<int> &uplink_subslots)
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{
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return gnuradio::get_initial_sptr
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(new universal_ctrl_chans_demapper_impl(timeslot_nr, downlink_starts_fn_mod51, downlink_channel_types, downlink_subslots, uplink_starts_fn_mod51, uplink_channel_types, uplink_subslots));
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}
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/*
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* The private constructor
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*/
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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> &downlink_subslots, const std::vector<int> &uplink_starts_fn_mod51, const std::vector<int> &uplink_channel_types, const std::vector<int> &uplink_subslots)
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: gr::block("universal_ctrl_chans_demapper",
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gr::io_signature::make(0, 0, 0),
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gr::io_signature::make(0, 0, 0)),
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d_timeslot_nr(timeslot_nr),
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d_downlink_starts_fn_mod51(51, 0),
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d_downlink_channel_types(51, 0),
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d_downlink_subslots(102, 0),
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d_uplink_starts_fn_mod51(51, 0),
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d_uplink_channel_types(51, 0),
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d_uplink_subslots(102, 0)
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{
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if(downlink_starts_fn_mod51.size() != 51 ||
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downlink_channel_types.size() != 51 ||
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downlink_subslots.size() != 102 ||
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uplink_starts_fn_mod51.size() != 51 ||
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uplink_channel_types.size() != 51 ||
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uplink_subslots.size() != 102 )
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{
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std::cout << "Check lengths of the vectors passed to the universal demapper - _starts_fn_mod15 and _sublots should have 51 elements, _subslots should have 102 elements" << std::endl;
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std::runtime_error("Check lengths of the vectors passed to the universal demapper - _starts_fn_mod15 and _sublots should have 51 elements, _subslots should have 102 elements");
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}
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std::copy(downlink_starts_fn_mod51.begin(), downlink_starts_fn_mod51.end(), d_downlink_starts_fn_mod51.begin());
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std::copy(downlink_channel_types.begin(), downlink_channel_types.end(), d_downlink_channel_types.begin());
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std::copy(downlink_subslots.begin(), downlink_subslots.end(), d_downlink_subslots.begin());
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std::copy(uplink_starts_fn_mod51.begin(), uplink_starts_fn_mod51.end(), d_uplink_starts_fn_mod51.begin());
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std::copy(uplink_channel_types.begin(), uplink_channel_types.end(), d_uplink_channel_types.begin());
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std::copy(uplink_subslots.begin(), uplink_subslots.end(), d_uplink_subslots.begin());
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message_port_register_in(pmt::mp("bursts"));
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set_msg_handler(pmt::mp("bursts"), boost::bind(&universal_ctrl_chans_demapper_impl::filter_ctrl_chans, this, boost::placeholders::_1));
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message_port_register_out(pmt::mp("bursts"));
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}
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/*
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* Our virtual destructor.
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*/
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universal_ctrl_chans_demapper_impl::~universal_ctrl_chans_demapper_impl()
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{
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}
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void universal_ctrl_chans_demapper_impl::filter_ctrl_chans(pmt::pmt_t burst_in)
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{
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pmt::pmt_t header_plus_burst = pmt::cdr(burst_in);
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int8_t * burst_in_int8 = (int8_t *)pmt::blob_data(header_plus_burst);
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gsmtap_hdr * header = (gsmtap_hdr *)(burst_in_int8);
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if(header->timeslot==d_timeslot_nr)
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{
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int * starts_fn_mod51;
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int * channel_types;
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int * subslots;
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uint32_t * frame_numbers;
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pmt::pmt_t * bursts;
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uint32_t frame_nr = be32toh(header->frame_number); //get frame number
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uint32_t fn_mod51 = frame_nr % 51; //frame number modulo 51
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uint32_t fn_mod102 = frame_nr % 102; //frame number modulo 102
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//create new burst
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int8_t burst_tmp[sizeof(gsmtap_hdr)+BURST_SIZE];
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memcpy(burst_tmp, burst_in_int8, sizeof(gsmtap_hdr)+BURST_SIZE);
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pmt::pmt_t msg_binary_blob = pmt::make_blob(burst_tmp,sizeof(gsmtap_hdr)+BURST_SIZE);
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pmt::pmt_t burst_out = pmt::cons(pmt::PMT_NIL, msg_binary_blob);
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gsmtap_hdr * new_header = (gsmtap_hdr *)pmt::blob_data(msg_binary_blob);
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//get information if burst is from uplink or downlink
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bool uplink_burst = (be16toh(header->arfcn) & 0x4000) ? true : false;
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//select right set of configuration and history for uplink or downlink
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if(uplink_burst) {
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starts_fn_mod51 = &d_uplink_starts_fn_mod51[0];
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channel_types = &d_uplink_channel_types[0];
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subslots = &d_uplink_subslots[0];
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frame_numbers = d_uplink_frame_numbers;
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bursts = d_uplink_bursts;
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} else {
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starts_fn_mod51 = &d_downlink_starts_fn_mod51[0];
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channel_types = &d_downlink_channel_types[0];
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subslots = &d_downlink_subslots[0];
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frame_numbers = d_downlink_frame_numbers;
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bursts = d_downlink_bursts;
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}
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//set type
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new_header->type = GSMTAP_TYPE_UM;
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//set type of the channel
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uint32_t ch_type = channel_types[fn_mod51];
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if(ch_type != 0)
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{
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new_header->sub_type = ch_type;
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}
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new_header->sub_slot = subslots[fn_mod102];
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if (ch_type == GSMTAP_CHANNEL_RACH)
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{
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message_port_pub(pmt::mp("bursts"), burst_out);
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return;
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}
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uint32_t fn51_start = starts_fn_mod51[fn_mod51];
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uint32_t fn51_stop = fn51_start + 3;
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if(fn_mod51>=fn51_start && fn_mod51<=fn51_stop)
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{
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uint32_t ii = fn_mod51 - fn51_start;
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frame_numbers[ii] = frame_nr;
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bursts[ii] = burst_out;
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}
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if(fn_mod51==fn51_stop)
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{
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//check for a situation where some bursts were lost
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//in this situation frame numbers won't be consecutive
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bool frames_are_consecutive = true;
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for(int jj=1; jj<4; jj++)
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{
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if((frame_numbers[jj] - frame_numbers[jj-1])!=1)
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{
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frames_are_consecutive = false;
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}
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}
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if(frames_are_consecutive)
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{
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//send bursts to the output
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for(int jj=0; jj<4; jj++)
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{
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message_port_pub(pmt::mp("bursts"), bursts[jj]);
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}
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}
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}
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}
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}
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} /* namespace gsm */
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} /* namespace gr */
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