| /* -*- c++ -*- */ |
| /* |
| * @file |
| * @author Roman Khassraf <rkhassraf@gmail.com> |
| * @section LICENSE |
| * |
| * Gr-gsm is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 3, or (at your option) |
| * any later version. |
| * |
| * Gr-gsm is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with gr-gsm; see the file COPYING. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <gnuradio/io_signature.h> |
| #include <grgsm/gsmtap.h> |
| #include <unistd.h> |
| #include <set> |
| #include <iterator> |
| #include <algorithm> |
| #include <iostream> |
| |
| #include "extract_immediate_assignment_impl.h" |
| |
| namespace gr { |
| namespace gsm { |
| boost::mutex extract_immediate_assignment_mutex; |
| |
| void extract_immediate_assignment_impl::process_message(pmt::pmt_t msg){ |
| pmt::pmt_t message_plus_header_blob = pmt::cdr(msg); |
| uint8_t * message_plus_header = (uint8_t *)pmt::blob_data(message_plus_header_blob); |
| gsmtap_hdr * header = (gsmtap_hdr *)message_plus_header; |
| uint8_t * msg_elements = (uint8_t *)(message_plus_header+sizeof(gsmtap_hdr)); |
| uint32_t frame_nr = be32toh(header->frame_number); |
| |
| if(msg_elements[2]==0x3f) |
| { |
| std::cout << "\n------------------------------------------------------------------\n" << std::endl; |
| std::cout << "Immediate assignment found !" << std::endl; |
| std::cout << "FrameNr: " << (unsigned)frame_nr << std::endl; |
| |
| uint8_t mode = msg_elements[3] & (1 << 4); |
| |
| /* |
| channel description, see table 10.23 in GSM 04.08 |
| |
| msg_elements[4], octet 2 in specs |
| |
| 5 bits channel type |
| ignored in TBF |
| 00001 TCH/F |
| 0001T TCH/H, subchannel/TDMA offset T |
| 001TT SDCCH/4, subchannel/TDMA offset TT |
| 01TTT SDCCH/8, subchannel/TDMA offset TTT |
| 3 bits timeslot number TN |
| */ |
| uint8_t channeltype = (msg_elements[4] >> 3); |
| uint8_t timeslot = (msg_elements[4] & 7); |
| uint8_t subchannel; |
| std::string channel_type; |
| |
| std::cout << "Timeslot: " << (unsigned)timeslot << std::endl; |
| |
| if (mode == 0) |
| { |
| if (channeltype >= 8) |
| { |
| channel_type = "SDCCH/8"; |
| subchannel = (channeltype & 7); |
| } |
| else if (channeltype >= 4 && channeltype <= 7) |
| { |
| channel_type = "SDCCH/4"; |
| subchannel = (channeltype & 3); |
| } |
| else if (channeltype >= 2 && channeltype <= 3) |
| { |
| channel_type = "TCH/H"; |
| subchannel = (channeltype & 1); |
| } |
| else |
| { |
| channel_type = "TCH/F"; |
| subchannel = 0; |
| } |
| |
| std::cout << "Channel type: " << channel_type << std::endl; |
| std::cout << "Subchannel: " << (unsigned)subchannel << std::endl; |
| } |
| else |
| { |
| std::cout << "Channel type: " << "GPRS - Temporary Block Flow TBF" << std::endl; |
| } |
| |
| /* |
| msg_elements[5], msg_elements[6] are octets 3 and 4 in specs |
| |
| 3 bits training sequence (we dont process this for the moment) |
| 1 bit hopping channel H |
| |
| if H = 0: |
| 2 bit spare |
| 2 bit high part of single channel arfcn |
| |
| 8 bit low part of single channel arfcn |
| |
| if H = 1: |
| 4 bit high part of MAIO |
| |
| 2 bit low part of MAIO |
| 6bit HSN |
| */ |
| uint8_t hopping = (msg_elements[5] >> 4) & 1; |
| |
| std::cout << "Hopping: " << (unsigned)hopping << std::endl; |
| |
| if (hopping) |
| { |
| uint8_t maio = (msg_elements[5] & 0xf) << 2; |
| maio |= (msg_elements[6] >> 6); |
| |
| uint8_t hsn = (msg_elements[6] & 0x3f); |
| |
| std::cout << "MAIO: " << (unsigned)maio << std::endl; |
| std::cout << "HSN: " << (unsigned)hsn << std::endl; |
| } |
| else |
| { |
| uint16_t arfcn = (msg_elements[5] & 3) << 8; |
| arfcn |= msg_elements[6]; |
| |
| std::cout << "ARFCN: " << (unsigned)arfcn << std::endl; |
| } |
| |
| // request reference as ID in set, so we get only one immediate assignment per reference |
| /* |
| msg_elements[7 - 9], octets 5 - 7 in specs : request reference, maybe later |
| |
| msg_elements[10]: timing advance |
| */ |
| uint8_t timing_advance = msg_elements[10]; |
| std::cout << "TA: " << (unsigned)timing_advance << std::endl; |
| |
| /* |
| msg_elements[11] - 20: mobile allocation, flexible length, see 10.5.2.21 |
| */ |
| |
| uint8_t mobile_allocation_len = msg_elements[11]; |
| if (mobile_allocation_len > 0) |
| { |
| uint8_t mobile_allocation[mobile_allocation_len]; |
| for (int i=0; i<mobile_allocation_len; i++) |
| { |
| mobile_allocation[i] = msg_elements[12 + i]; |
| std::cout << "MA: " << (unsigned)mobile_allocation[i] << std::endl; |
| } |
| } |
| } |
| } |
| |
| extract_immediate_assignment::sptr |
| extract_immediate_assignment::make() |
| { |
| return gnuradio::get_initial_sptr |
| (new extract_immediate_assignment_impl()); |
| } |
| |
| /* |
| * The private constructor |
| */ |
| extract_immediate_assignment_impl::extract_immediate_assignment_impl() |
| : gr::block("extract_immediate_assignment", |
| gr::io_signature::make(0, 0, 0), |
| gr::io_signature::make(0, 0, 0)) |
| { |
| message_port_register_in(pmt::mp("msgs")); |
| set_msg_handler(pmt::mp("msgs"), boost::bind(&extract_immediate_assignment_impl::process_message, this, _1)); |
| } |
| |
| /* |
| * Our virtual destructor. |
| */ |
| extract_immediate_assignment_impl::~extract_immediate_assignment_impl() |
| { |
| } |
| } /* namespace gsm */ |
| } /* namespace gr */ |
| |