197 lines
6.9 KiB
C++
197 lines
6.9 KiB
C++
/* -*- c++ -*- */
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/* @file
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* @author Piotr Krysik <ptrkrysik@gmail.com>
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* @author Vadim Yanitskiy <axilirator@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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*/
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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 <grgsm/gsmtap.h>
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#include "txtime_setter_impl.h"
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#define UNKNOWN_FN 0xffffffff
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#define MAX_EARLY_TIME_DIFF 10.0
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namespace gr {
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namespace gsm {
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txtime_setter::sptr
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txtime_setter::make(
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uint32_t init_fn, uint64_t init_time_secs,
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double init_time_fracs, uint64_t time_hint_secs,
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double time_hint_fracs, double timing_advance,
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double delay_correction)
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{
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return gnuradio::get_initial_sptr
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(new txtime_setter_impl(init_fn, init_time_secs,
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init_time_fracs, time_hint_secs, time_hint_fracs,
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timing_advance, delay_correction));
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}
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/*
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* The private constructor
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*/
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txtime_setter_impl::txtime_setter_impl(
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uint32_t init_fn, uint64_t init_time_secs,
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double init_time_fracs, uint64_t time_hint_secs,
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double time_hint_fracs, double timing_advance,
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double delay_correction
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) : gr::block("txtime_setter",
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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_time_hint(time_hint_secs,time_hint_fracs),
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d_time_ref(init_time_secs,init_time_fracs),
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d_delay_correction(delay_correction),
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d_timing_advance(timing_advance),
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d_fn_ref(init_fn),
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d_ts_ref(0)
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{
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// Register I/O ports
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message_port_register_in(pmt::mp("fn_time"));
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message_port_register_in(pmt::mp("bursts_in"));
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message_port_register_out(pmt::mp("bursts_out"));
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// Bind message handlers
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set_msg_handler(pmt::mp("fn_time"),
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boost::bind(&txtime_setter_impl::process_fn_time_reference,
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this, _1));
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set_msg_handler(pmt::mp("bursts_in"),
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boost::bind(&txtime_setter_impl::process_txtime_of_burst,
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this, _1));
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}
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/*
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* Our virtual destructor.
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*/
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txtime_setter_impl::~txtime_setter_impl()
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{
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}
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void txtime_setter_impl::process_fn_time_reference(pmt::pmt_t msg)
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{
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pmt::pmt_t not_found = pmt::intern("not_found");
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pmt::pmt_t fn_time, time_hint;
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fn_time = pmt::dict_ref(msg,
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pmt::intern("fn_time"), not_found);
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time_hint = pmt::dict_ref(msg,
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pmt::intern("fn_time"), not_found);
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if (fn_time != not_found) {
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uint32_t fn_ref = static_cast<uint32_t>
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(pmt::to_uint64(pmt::car(pmt::car(fn_time))));
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uint32_t ts = static_cast<uint32_t>
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(pmt::to_uint64(pmt::cdr(pmt::car(fn_time))));
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uint64_t time_secs = pmt::to_uint64(
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pmt::car(pmt::cdr(fn_time)));
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double time_fracs = pmt::to_double(
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pmt::cdr(pmt::cdr(fn_time)));
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set_fn_time_reference(fn_ref, ts, time_secs, time_fracs);
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} else if (time_hint != not_found) {
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set_time_hint(pmt::to_uint64(pmt::car(fn_time)),
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pmt::to_double(pmt::cdr(fn_time)));
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}
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}
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void txtime_setter_impl::process_txtime_of_burst(pmt::pmt_t msg_in)
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{
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if (d_fn_ref != UNKNOWN_FN)
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{
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pmt::pmt_t blob = pmt::cdr(msg_in);
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// Extract GSMTAP header from message
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gsmtap_hdr *header = (gsmtap_hdr *) pmt::blob_data(blob);
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uint32_t frame_nr = be32toh(header->frame_number);
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uint32_t ts_num = header->timeslot;
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time_format txtime = fn_time_delta_cpp(d_fn_ref, d_time_ref,
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frame_nr, d_time_hint, ts_num, d_ts_ref);
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time_spec_t txtime_spec = time_spec_t(txtime.first, txtime.second);
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txtime_spec -= d_delay_correction;
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txtime_spec -= d_timing_advance;
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time_spec_t current_time_estimate = time_spec_t(d_time_hint.first, d_time_hint.second);
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if (txtime_spec <= current_time_estimate) { // Drop too late bursts
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std::cout << "lB" << std::flush;
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} else if (txtime_spec > current_time_estimate + MAX_EARLY_TIME_DIFF) { // Drop too early bursts
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std::cout << "eB" << std::flush; //TODO: too early condition might happen when changing BTSes.
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//Wrong fn_time is applied to new or old bursts in such situation.
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//This solution is not perfect as MS might be blocked upto
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//MAX_EARLY_TIME_DIFF seconds.
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//Better solution would be to indentify fn_time and burst coming
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//from given BTS (i.e. based on ARFCN) and dropping bursts for which
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//the bts_id doesn't match with bts_id of fn_time.
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} else { //process bursts that are in the right time-frame
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pmt::pmt_t tags_dict = pmt::dict_add(
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pmt::make_dict(),
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pmt::intern("tx_time"),
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pmt::make_tuple(
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pmt::from_uint64(txtime_spec.get_full_secs()),
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pmt::from_double(txtime_spec.get_frac_secs()))
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);
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tags_dict = pmt::dict_add(tags_dict,
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pmt::intern("fn"), pmt::from_uint64(frame_nr));
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tags_dict = pmt::dict_add(tags_dict,
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pmt::intern("ts"), pmt::from_uint64(ts_num));
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// Send a message to the output
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pmt::pmt_t msg_out = pmt::cons(tags_dict, pmt::cdr(msg_in));
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message_port_pub(pmt::mp("bursts_out"), msg_out);
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}
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}
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}
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void txtime_setter_impl::set_fn_time_reference(
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uint32_t fn, uint32_t ts, uint64_t time_secs,
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double time_fracs)
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{
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d_fn_ref = fn;
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d_ts_ref = ts;
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d_time_ref = std::make_pair(time_secs, time_fracs);
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set_time_hint(time_secs, time_fracs);
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}
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void txtime_setter_impl::set_time_hint(
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uint64_t time_hint_secs, double time_hint_fracs)
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{
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d_time_hint = std::make_pair(time_hint_secs, time_hint_fracs);
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}
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void txtime_setter_impl::set_delay_correction(double delay_correction)
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{
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d_delay_correction = delay_correction;
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}
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void txtime_setter_impl::set_timing_advance(double timing_advance)
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{
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d_timing_advance = timing_advance;
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}
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} /* namespace gsm */
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} /* namespace gr */
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