333 lines
10 KiB
C++
333 lines
10 KiB
C++
/* -*- c++ -*- */
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/*
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* @file
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* @author Roman Khassraf <rkhassraf@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 <grgsm/gsmtap.h>
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#include <unistd.h>
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#include <set>
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#include <map>
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#include <iterator>
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#include <algorithm>
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#include <iostream>
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#include <endian.h>
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#include <boost/foreach.hpp>
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#include "extract_immediate_assignment_impl.h"
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namespace gr {
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namespace gsm {
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boost::mutex extract_immediate_assignment_mutex;
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void extract_immediate_assignment_impl::process_message(pmt::pmt_t msg){
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pmt::pmt_t message_plus_header_blob = pmt::cdr(msg);
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uint8_t * message_plus_header = (uint8_t *)pmt::blob_data(message_plus_header_blob);
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gsmtap_hdr * header = (gsmtap_hdr *)message_plus_header;
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uint8_t * msg_elements = (uint8_t *)(message_plus_header+sizeof(gsmtap_hdr));
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uint32_t frame_nr = be32toh(header->frame_number);
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if(msg_elements[2]==0x3f)
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{
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immediate_assignment current;
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std::cout << "\n------------------------------------------------------------------\n" << std::endl;
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std::cout << "FrameNr: " << (unsigned)frame_nr << std::endl;
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current.frame_nr = frame_nr;
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uint8_t mode = msg_elements[3] & (1 << 4);
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/*
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channel description, see table 10.23 in GSM 04.08
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msg_elements[4], octet 2 in specs
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5 bits channel type
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ignored in TBF
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00001 TCH/F
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0001T TCH/H, subchannel/TDMA offset T
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001TT SDCCH/4, subchannel/TDMA offset TT
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01TTT SDCCH/8, subchannel/TDMA offset TTT
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3 bits timeslot number TN
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*/
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uint8_t channeltype = (msg_elements[4] >> 3);
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uint8_t timeslot = (msg_elements[4] & 7);
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uint8_t subchannel;
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std::string channel_type;
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std::cout << "Timeslot: " << (unsigned)timeslot << std::endl;
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if (mode == 0)
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{
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if (channeltype >= 8)
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{
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channel_type = "SDCCH/8";
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subchannel = (channeltype & 7);
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}
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else if (channeltype >= 4 && channeltype <= 7)
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{
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channel_type = "SDCCH/4";
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subchannel = (channeltype & 3);
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}
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else if (channeltype >= 2 && channeltype <= 3)
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{
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channel_type = "TCH/H";
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subchannel = (channeltype & 1);
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}
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else
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{
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channel_type = "TCH/F";
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subchannel = 0;
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}
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std::cout << "Channel type: " << channel_type << std::endl;
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std::cout << "Subchannel: " << (unsigned)subchannel << std::endl;
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}
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else
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{
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channel_type = "GPRS - Temporary Block Flow TBF";
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subchannel = 0;
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std::cout << "Channel type: " << "GPRS - Temporary Block Flow TBF" << std::endl;
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}
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current.channel_type = channel_type;
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current.timeslot = timeslot;
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current.subchannel = subchannel;
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/*
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msg_elements[5], msg_elements[6] are octets 3 and 4 in specs
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3 bits training sequence (we dont process this for the moment)
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1 bit hopping channel H
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if H = 0:
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2 bit spare
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2 bit high part of single channel arfcn
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8 bit low part of single channel arfcn
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if H = 1:
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4 bit high part of MAIO
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2 bit low part of MAIO
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6bit HSN
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*/
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uint8_t hopping = (msg_elements[5] >> 4) & 1;
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current.hopping = hopping;
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std::cout << "Hopping: " << (unsigned)hopping << std::endl;
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if (hopping)
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{
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uint8_t maio = (msg_elements[5] & 0xf) << 2;
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maio |= (msg_elements[6] >> 6);
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uint8_t hsn = (msg_elements[6] & 0x3f);
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current.maio = maio;
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current.hsn = hsn;
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std::cout << "MAIO: " << (unsigned)maio << std::endl;
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std::cout << "HSN: " << (unsigned)hsn << std::endl;
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}
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else
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{
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uint16_t arfcn = (msg_elements[5] & 3) << 8;
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arfcn |= msg_elements[6];
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current.arfcn = arfcn;
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std::cout << "ARFCN: " << (unsigned)arfcn << std::endl;
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}
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// request reference as ID in set, so we get only one immediate assignment per reference
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/*
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msg_elements[7 - 9], octets 5 - 7 in specs : request reference, maybe later
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msg_elements[10]: timing advance
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*/
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uint8_t timing_advance = msg_elements[10];
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std::cout << "TA: " << (unsigned)timing_advance << std::endl;
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current.timing_advance = timing_advance;
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/*
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msg_elements[11] - 20: mobile allocation, flexible length, see 10.5.2.21
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*/
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uint8_t mobile_allocation_len = msg_elements[11];
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if (mobile_allocation_len > 0)
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{
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uint8_t mobile_allocation[mobile_allocation_len];
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std::string ma;
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for (int i=0; i<mobile_allocation_len; i++)
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{
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mobile_allocation[i] = msg_elements[12 + i];
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for (int j=0; j<8; j++)
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{
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ma.push_back('0' + ((mobile_allocation[i] >> (7-j)) & 0x1));
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}
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// std::cout << "MA: " << (unsigned)mobile_allocation[i] << std::endl;
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std::cout << "MA: " << ma << std::endl;
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}
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current.mobile_allocation = ma;
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}
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d_assignment_map[current.frame_nr] = current;
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}
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}
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std::vector<int> extract_immediate_assignment_impl::get_frame_numbers()
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{
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std::vector<int> fnrs;
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BOOST_FOREACH(immediate_assignment_map::value_type &i, d_assignment_map)
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{
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fnrs.push_back(i.second.frame_nr);
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}
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return fnrs;
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}
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std::vector<std::string> extract_immediate_assignment_impl::get_channel_types()
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{
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std::vector<std::string> types;
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BOOST_FOREACH(immediate_assignment_map::value_type &i, d_assignment_map)
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{
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types.push_back(i.second.channel_type);
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}
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return types;
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}
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std::vector<int> extract_immediate_assignment_impl::get_timeslots()
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{
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std::vector<int> timeslots;
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BOOST_FOREACH(immediate_assignment_map::value_type &i, d_assignment_map)
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{
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timeslots.push_back(i.second.timeslot);
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}
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return timeslots;
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}
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std::vector<int> extract_immediate_assignment_impl::get_subchannels()
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{
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std::vector<int> subchannels;
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BOOST_FOREACH(immediate_assignment_map::value_type &i, d_assignment_map)
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{
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subchannels.push_back(i.second.subchannel);
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}
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return subchannels;
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}
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std::vector<int> extract_immediate_assignment_impl::get_hopping()
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{
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std::vector<int> hopping;
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BOOST_FOREACH(immediate_assignment_map::value_type &i, d_assignment_map)
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{
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hopping.push_back(i.second.hopping);
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}
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return hopping;
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}
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std::vector<int> extract_immediate_assignment_impl::get_maios()
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{
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std::vector<int> maios;
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BOOST_FOREACH(immediate_assignment_map::value_type &i, d_assignment_map)
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{
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maios.push_back(i.second.maio);
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}
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return maios;
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}
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std::vector<int> extract_immediate_assignment_impl::get_hsns()
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{
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std::vector<int> hsns;
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BOOST_FOREACH(immediate_assignment_map::value_type &i, d_assignment_map)
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{
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hsns.push_back(i.second.hsn);
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}
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return hsns;
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}
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std::vector<int> extract_immediate_assignment_impl::get_arfcns()
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{
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std::vector<int> arfcns;
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BOOST_FOREACH(immediate_assignment_map::value_type &i, d_assignment_map)
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{
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arfcns.push_back(i.second.arfcn);
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}
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return arfcns;
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}
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std::vector<int> extract_immediate_assignment_impl::get_timing_advances()
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{
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std::vector<int> tas;
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BOOST_FOREACH(immediate_assignment_map::value_type &i, d_assignment_map)
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{
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tas.push_back(i.second.timing_advance);
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}
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return tas;
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}
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std::vector<std::string> extract_immediate_assignment_impl::get_mobile_allocations()
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{
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std::vector<std::string> mobile_allocations;
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BOOST_FOREACH(immediate_assignment_map::value_type &i, d_assignment_map)
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{
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mobile_allocations.push_back(i.second.mobile_allocation);
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}
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return mobile_allocations;
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}
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extract_immediate_assignment::sptr
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extract_immediate_assignment::make()
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{
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return gnuradio::get_initial_sptr
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(new extract_immediate_assignment_impl());
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}
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/*
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* The private constructor
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*/
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extract_immediate_assignment_impl::extract_immediate_assignment_impl()
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: gr::block("extract_immediate_assignment",
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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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{
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message_port_register_in(pmt::mp("msgs"));
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set_msg_handler(pmt::mp("msgs"), boost::bind(&extract_immediate_assignment_impl::process_message, 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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extract_immediate_assignment_impl::~extract_immediate_assignment_impl()
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{
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}
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} /* namespace gsm */
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} /* namespace gr */
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