Implementation of a block for extracting immediate assignments from control channel messages. Currently only printing to terminal.
diff --git a/grc/gsm_block_tree.xml b/grc/gsm_block_tree.xml
index 3952fff..94d1d82 100644
--- a/grc/gsm_block_tree.xml
+++ b/grc/gsm_block_tree.xml
@@ -43,6 +43,7 @@
<block>gsm_burst_sink</block>
<block>gsm_burst_source</block>
<block>gsm_extract_system_info</block>
+ <block>gsm_extract_immediate_assignment</block>
<block>gsm_controlled_rotator_cc</block>
<block>gsm_controlled_const_source_f</block>
<block>gsm_message_printer</block>
diff --git a/grc/misc_utils/CMakeLists.txt b/grc/misc_utils/CMakeLists.txt
index aa7517c..d545692 100644
--- a/grc/misc_utils/CMakeLists.txt
+++ b/grc/misc_utils/CMakeLists.txt
@@ -19,6 +19,7 @@
install(FILES
gsm_extract_system_info.xml
+ gsm_extract_immediate_assignment.xml
gsm_controlled_rotator_cc.xml
gsm_controlled_const_source_f.xml
gsm_message_printer.xml
diff --git a/grc/misc_utils/gsm_extract_immediate_assignment.xml b/grc/misc_utils/gsm_extract_immediate_assignment.xml
new file mode 100644
index 0000000..0f5635b
--- /dev/null
+++ b/grc/misc_utils/gsm_extract_immediate_assignment.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0"?>
+<block>
+ <name>Extract immediate assignment</name>
+ <key>gsm_extract_immediate_assignment</key>
+ <import>import grgsm</import>
+ <make>grgsm.extract_immediate_assignment()</make>
+
+ <sink>
+ <name>msgs</name>
+ <type>message</type>
+ </sink>
+</block>
diff --git a/include/grgsm/misc_utils/CMakeLists.txt b/include/grgsm/misc_utils/CMakeLists.txt
index 3d3383a..3d63d46 100644
--- a/include/grgsm/misc_utils/CMakeLists.txt
+++ b/include/grgsm/misc_utils/CMakeLists.txt
@@ -25,6 +25,7 @@
burst_sink.h
burst_source.h
extract_system_info.h
+ extract_immediate_assignment.h
controlled_rotator_cc.h
controlled_const_source_f.h
message_printer.h
diff --git a/include/grgsm/misc_utils/extract_immediate_assignment.h b/include/grgsm/misc_utils/extract_immediate_assignment.h
new file mode 100644
index 0000000..74e69a4
--- /dev/null
+++ b/include/grgsm/misc_utils/extract_immediate_assignment.h
@@ -0,0 +1,56 @@
+/* -*- 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.
+ */
+
+
+#ifndef INCLUDED_GSM_EXTRACT_IMMEDIATE_ASSIGNMENT_H
+#define INCLUDED_GSM_EXTRACT_IMMEDIATE_ASSIGNMENT_H
+
+#include <grgsm/api.h>
+#include <gnuradio/block.h>
+
+namespace gr {
+ namespace gsm {
+
+ /*!
+ * \brief <+description of block+>
+ * \ingroup gsm
+ *
+ */
+ class GSM_API extract_immediate_assignment : virtual public gr::block
+ {
+ public:
+ typedef boost::shared_ptr<extract_immediate_assignment> sptr;
+
+ /*!
+ * \brief Return a shared_ptr to a new instance of gsm::extract_immediate_assignment.
+ *
+ * To avoid accidental use of raw pointers, gsm::extract_immediate_assignment's
+ * constructor is in a private implementation
+ * class. gsm::extract_immediate_assignment::make is the public interface for
+ * creating new instances.
+ */
+ static sptr make();
+ };
+ } // namespace gsm
+} // namespace gr
+
+#endif /* INCLUDED_GSM_EXTRACT_IMMEDIATE_ASSIGNMENT_H */
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 4a88edb..7a8cf94 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -33,6 +33,7 @@
receiver/cx_channel_hopper_impl.cc
misc_utils/bursts_printer_impl.cc
misc_utils/extract_system_info_impl.cc
+ misc_utils/extract_immediate_assignment_impl.cc
demapping/universal_ctrl_chans_demapper_impl.cc
demapping/tch_f_chans_demapper_impl.cc
decoding/control_channels_decoder_impl.cc
diff --git a/lib/misc_utils/extract_immediate_assignment_impl.cc b/lib/misc_utils/extract_immediate_assignment_impl.cc
new file mode 100644
index 0000000..b7df803
--- /dev/null
+++ b/lib/misc_utils/extract_immediate_assignment_impl.cc
@@ -0,0 +1,200 @@
+/* -*- 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 */
+
diff --git a/lib/misc_utils/extract_immediate_assignment_impl.h b/lib/misc_utils/extract_immediate_assignment_impl.h
new file mode 100644
index 0000000..2bb9538
--- /dev/null
+++ b/lib/misc_utils/extract_immediate_assignment_impl.h
@@ -0,0 +1,43 @@
+/* -*- 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.
+ */
+
+#ifndef INCLUDED_GSM_EXTRACT_IMMEDIATE_ASSIGNMENT_IMPL_H
+#define INCLUDED_GSM_EXTRACT_IMMEDIATE_ASSIGNMENT_IMPL_H
+
+#include <grgsm/misc_utils/extract_immediate_assignment.h>
+
+
+namespace gr {
+ namespace gsm {
+
+ class extract_immediate_assignment_impl : public extract_immediate_assignment
+ {
+ private:
+ void process_message(pmt::pmt_t msg);
+ public:
+ extract_immediate_assignment_impl();
+ ~extract_immediate_assignment_impl();
+ };
+ } // namespace gsm
+} // namespace gr
+
+#endif /* INCLUDED_GSM_EXTRACT_IMMEDIATE_ASSIGNMENT_IMPL_H */
diff --git a/swig/grgsm_swig.i b/swig/grgsm_swig.i
index f1f37bf..79831f8 100644
--- a/swig/grgsm_swig.i
+++ b/swig/grgsm_swig.i
@@ -20,6 +20,7 @@
#include "grgsm/misc_utils/controlled_const_source_f.h"
#include "grgsm/misc_utils/controlled_rotator_cc.h"
#include "grgsm/misc_utils/extract_system_info.h"
+#include "grgsm/misc_utils/extract_immediate_assignment.h"
#include "grgsm/misc_utils/message_printer.h"
#include "grgsm/misc_utils/tmsi_dumper.h"
#include "grgsm/misc_utils/burst_sink.h"
@@ -55,6 +56,8 @@
GR_SWIG_BLOCK_MAGIC2(gsm, burst_source);
%include "grgsm/misc_utils/extract_system_info.h"
GR_SWIG_BLOCK_MAGIC2(gsm, extract_system_info);
+%include "grgsm/misc_utils/extract_immediate_assignment.h"
+GR_SWIG_BLOCK_MAGIC2(gsm, extract_immediate_assignment);
%include "grgsm/misc_utils/controlled_rotator_cc.h"
GR_SWIG_BLOCK_MAGIC2(gsm, controlled_rotator_cc);
%include "grgsm/misc_utils/controlled_const_source_f.h"