root/vtcross/trunk/src/cross-examples/python/gnuradio-examples/benchmark_dsa.py @ 505

#!/usr/bin/env python
#
# Copyright 2005,2006,2007,2009 Free Software Foundation, Inc.
#
# Copyright 2009 Virginia Polytechnic Institute and State University 
# 
# GNU Radio 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.
# 
# GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
# 

from gnuradio import gr, gru, modulation_utils
from gnuradio import eng_notation
from gnuradio.eng_option import eng_option
from optparse import OptionParser
from numpy import random
import random, time, struct, sys, math
from datetime import datetime

# from current dir
#from transmit_path import transmit_path
#from receive_path import receive_path

import usrp_transmit_path
import usrp_receive_path


try:
    from cross import *
    cross_import = True
except ImportError:
    cross_import = False

global sync_status,mode,ch,traffic_flag,n_rcvd, n_right
global ticker_start,time_right_now #measuring duration over which no packet is sent
ticker_start = datetime.now()
#no_packet_stop_time = False
global no_packet_period #allowed duration for no packet
no_packet_period = 3
sync_status = False

#Defining modes of operation
# sync: the two nodes are trying to rendezvous on a common channel
# traffic: the two node are communicating information to each other
mode = "sync" #Default mode is sync
traffic_flag = False

class my_top_block(gr.top_block):

    def __init__(self, mod_class, demod_class,
            rx_callback, options_tx,options_rx):

        gr.top_block.__init__(self)
        self.rxpath = usrp_receive_path.usrp_receive_path(demod_class, rx_callback, options_rx)
        self.txpath = usrp_transmit_path.usrp_transmit_path(mod_class, options_tx)
        self.connect(self.txpath);
        self.connect(self.rxpath);


def main():

    global stats_array, count_array, time_array, n_rcvd
    global n_right, sync_status, mode, ch, traffic_flag
    global n_attempts, return_flag, crossShellHost, crossShellPort
    global ticker_start,time_right_now,no_packet_period

   
    n_rcvd = 0
    n_right = 0
    n_attempts = 5
    return_flag = 0

    count_array = [ 0, 0, 0, 0, 0]
    time_array = [ 0, 0, 0, 0, 0]
    stats_array = [ 0, 0, 0, 0, 0]


    def send_pkt(self, payload='', eof=False):
        return self.txpath.send_pkt(payload, eof)


    def get_real_channel(channel):

        real_channel = 1;

        get_channel = {
            1: 1,
            2: 7,
            3: 8,
            4: 14 
        }

        real_channel = get_channel[channel]

        return real_channel


    def get_average_time(channel,absent_time):

        global count_array, time_array

        count_array[channel] = count_array[channel] + 1
        average_time = (time_array[channel] + absent_time) / count_array[channel]    
    
        return average_time


    def get_freq(hop_freq,probe_level,absent_time,cross):

        # Convert hop_freq to our unique channel list

        if cross == True:

            freq_channel = {
                462562500: 1,
                462712500: 2,
                467562500: 3,
                467712500: 4,
            }

            currentParameters = Parameter(1)
            currentParameters[0].name = "channel"
            currentParameters[0].value = freq_channel[hop_freq] 

            o = Observable(2)
            o[0].value = probe_level
            o[0].name = "energy"
    
            o[1].value = absent_time 
            o[1].name = "communication_time"
        
            # If time == 0 then we are scanning and we dont want to 
            #  use this time in the averaging process.
            if absent_time != 0:
                try:
                    UpdateParameterPerformance(currentParameters,1,o,1)
                except:
                    print "fail"
            else:
                # Get the average communication time
                average_time = get_average_time(freq_channel[hop_freq], absent_time)
                o[1].value = average_time 
                o[1].name = "communication_time"
                try:
                    UpdateParameterPerformance(currentParameters,1,o,2)
                except:
                    print "fail"

            p = Parameter(1)
            p = GetOptimalParameters(o,2,currentParameters,1);
        
            channel = get_real_channel(int(p[0].value))
        else:
            channel = int(random.choice([1,7,8,14]))
            
        if channel < 8:
            hop_freq = float(1e6 * (462.5625+(channel-1)*0.025))#setting the centre freq frequency for sending packets
        else:
            hop_freq = float(1e6 * (467.5625+(channel-8)*0.025))#setting the centre freq frequency for sending packets    
        
        return channel,hop_freq #returning the channel number and hop frequency
    

    def rx_callback(ok, payload):
        
        global n_rcvd, n_right,sync_status,mode,ch,traffic_flag,ticker_start

        ticker_start = datetime.now()
        #print "inside callback"
        #print "ticker_start ",ticker_start
        ########################## sync ####################################
        if mode == "sync":
            if ok:
                (pktno,) = struct.unpack('!H', payload[0:2])
                (sync_signal,) = struct.unpack('!s', payload[2]) 
                (data_channel,) = struct.unpack('!H', payload[3:5])
                                  
                if str(sync_signal) == 'o' and str(data_channel) == str(ch):
                    sync_status = True
                    #tb.stop()
                                               
                if str(sync_signal) == 's' and str(data_channel) == str(ch): 
                    sync_status = True
                    data = 'o'
                    pktno=0
                    ack_payload = struct.pack('!HsH', pktno & 0xffff,data,ch & 0xffff) #+ data
                    send_pkt(tb,ack_payload) #sending back the acknowledgement
        ###################################################################
            
        ######################### traffic #################################
        if mode == "traffic":
        
        
        
                
            if ok: 
                (data_header,) = struct.unpack('!s', payload[0])
                if data_header == 'd':
                    traffic_flag = True
                    comm = struct.unpack('!14s', payload[1:15])
                    data = 'dI am fine.....' #Sending this message
                    payload = struct.pack('!15s', data)
                    send_pkt(tb,payload)
                
        ##############################################################

        n_rcvd += 1
        if ok:
            n_right += 1

    mods = modulation_utils.type_1_mods()
    demods = modulation_utils.type_1_demods()

    # Set default values for the CROSS shell location. These can be overridden
    # via command-line parameters
    crossShellHost = "localhost"
    crossShellPort = "40000"

    #setting up the tx options parser

    parser_tx = OptionParser(option_class=eng_option, conflict_handler="resolve")
    
    parser_tx.add_option("-m", "--modulation", type="choice", choices=mods.keys(),
            default='gmsk',help="Select modulation from: %s [default=%%default]" 
            % (', '.join(mods.keys()),))
    parser_tx.add_option("-s", "--size", type="eng_float", default=1500,
                      help="set packet size [default=%default]")
    parser_tx.add_option("-M", "--megabytes", type="eng_float", default=1.0,
                      help="set megabytes to transmit [default=%default]")
    parser_tx.add_option("","--discontinuous", action="store_true", default=False,
                      help="enable discontinous transmission (bursts of 5 packets)") 
    parser_tx.add_option("","--from-file", default=None,
                          help="use file for packet contents")
    parser_tx.add_option("-n", "--hostname", action="store", type="string", dest="crossShellHost",
            default="localhost", help="Set the hostname/IP for the VTCROSS shell");
    parser_tx.add_option("-p", "--port", action="store", type="string", dest="crossShellPort",
            default="40000", help="Set the port for the VTCROSS shell");
 
    expert_grp_tx = parser_tx.add_option_group("Expert_tx")
    dsa_grp = parser_tx.add_option_group("DSA Options")
    dsa_grp.add_option("-c", "--cross", action="store_true", default=False,
            help="Use the CROSS CBR Cognitive Engine for DSA channel decisions [default=off (random selection)].")
        
    dsa_grp.add_option("-T", "--threshold", type="eng_float", default=1.5e8,
                          help="set primary user sensing energy threshold [default=%default]")
  

    usrp_transmit_path.add_options(parser_tx, expert_grp_tx)
    parser_tx.remove_option('-f');
    parser_tx.remove_option('--tx-freq');

    for mod in mods.values():
        mod.add_options(expert_grp_tx)


    (options_tx, args_tx) = parser_tx.parse_args ()

    if len(args_tx) != 0:
        parser_tx.print_help()
        sys.exit(1)
    
    ############# Setting some default values for tx side of the block
    options_tx.tx_freq = 462.5625e6
    options_tx.samples_per_symbol =  2
    options_tx.modulation = 'dbpsk'
    options_tx.fusb_block_size = 4096
    options_tx.fusb_nblocks = 16
    options_tx.bitrate = 0.0125e6
    #############

    if options_tx.tx_freq is None:
        sys.stderr.write("You must specify -f FREQ or --freq FREQ\n")
        parser_tx.print_help(sys.stderr)
        sys.exit(1)

    parser_rx = OptionParser (option_class=eng_option, conflict_handler="resolve")
    expert_grp_rx = parser_rx.add_option_group("Expert_rx")
    usrp_receive_path.add_options(parser_rx, expert_grp_rx)
    
    parser_rx.remove_option('-f');
        
    parser_rx.add_option("-c", "--cross", action="store_true", default=False,
            help="Use the CROSS engine for DSA decisions: default is random.")
    parser_rx.add_option("-T", "--threshold", type="eng_float", default=1.5e8,
                          help="set primary user sensing energy threshold [default=%default]")
    parser_rx.add_option("-n", "--hostname", action="store", type="string", dest="crossShellHost",
            default="localhost", help="Set the hostname/IP for the VTCROSS shell");
    parser_rx.add_option("-p", "--port", action="store", type="string", dest="crossShellPort",
            default="40000", help="Set the port for the VTCROSS shell");
 


    (options_rx, args_rx) = parser_rx.parse_args ()

    ############# Setting some default values for rx side of the block
    options_rx.rx_freq = 462.5625e6 #setting default rx_freq value
    options_rx.samples_per_symbol =  2
    options_rx.modulation = 'dbpsk'
    options_rx.fusb_block_size = 4096
    options_rx.fusb_nblocks = 16
    options_rx.bitrate = 0.0125e6
    #############


    if options_rx.cross == True:
        if cross_import == False:
            print "\n\n[[ CROSS Import failed..  Defaulting to RANDOM channel selection ]]"
            print "[[ Using the RANDOM channel selection algorithm ]]\n\n"
            options_rx.cross = False
        else:
            print "[[ Using the CROSS DSA Cognitive Engine ]]"
            crossShellHost = options_rx.crossShellHost
            crossShellPort = options_rx.crossShellPort
            print "[[ VTCROSS shell located at " + crossShellHost + ":" + crossShellPort + " ]]"
            SetCrossShellLocation(crossShellHost, crossShellPort)
    else:
        print "[[ Using the RANDOM channel selection algorithm ]]\n\n"
        
    # build the graph
        print "printing modulation scheme",demods[options_rx.modulation]
    tb = my_top_block(mods[options_tx.modulation],
                      demods[options_rx.modulation],
                      rx_callback,options_tx,
                      options_rx)
    r = gr.enable_realtime_scheduling()
    if r != gr.RT_OK:
        print "Warning: failed to enable realtime scheduling"
    
    tb.start()

    #listening to random frequencies untill a match is found
    running = True
    ch_energy = tb.rxpath.probe.level() #setting initial value
    hop_freq = options_tx.tx_freq #  = options_rx.rx_freq...same for tx and rx side
       
    # Scan all channels first for inital data
    #time.sleep(0.1)

    print "\n[[ Scanning channels for network nodes ]]\n"
    while running:
        ################################################sync mode####################################
        if mode == "sync":
            if sync_status != True:
                    
                if return_flag == 0:
                    ch,hop_freq = get_freq(hop_freq,ch_energy,0,options_rx.cross)
                else:
                    ch,hop_freq = get_freq(hop_freq,ch_energy,elapsed_time,options_rx.cross)
                    return_flag = 0

                tb.txpath.u.set_center_freq(hop_freq)
                tb.rxpath.u.set_center_freq(hop_freq)
              
                ch_energy = tb.rxpath.probe.level() #check if primary user is present
                
                if int(ch_energy) > 1.5e8: #if primary user is there then dont transmit on this channel
                    continue
                
                nbytes = 5 #int(1e6 * .0003)
                pkt_size = 5
                n = 0
                pktno = 0
                while n < nbytes:
                    if options_tx.from_file is None:
                        data = 's'
                    else:
                        data = source_file.read(pkt_size - 2)
                        if data == '':
                            break;

                    payload = struct.pack('!HsH', pktno & 0xffff,data,ch & 0xffff) #+ data
                            
                    send_pkt(tb,payload)
                    n += len(payload)
                    sys.stderr.write('.')
                    if options_tx.discontinuous and pktno % 5 == 4:
                        time.sleep(1)
                        pktno += 1
                time.sleep(0.1)
                    
            else:
                print "\n\n[[ Network Node Found: Commencing communications on CHANNEL ", ch, " ]]\n";
                n_attempts_counter = 0
                mode = "traffic"
                traffic_flag = False
                sync_status="False"
                start_time = datetime.now() #measuring the time for which the primary user is away
    
        ################################################end of sync mode####################################

        ################################################Communications mode#################################
        if mode == "traffic":
            nbytes = 15
            pkt_size = 15
            data_pktno = 0
            n = 0
            while n < nbytes:
                if options_tx.from_file is None:
                    data = 'dHi how are you' #Sending this message
                else:
                    data = source_file.read(pkt_size - 2)
                    if data == '':
                        break;
    
            
                payload = struct.pack('!15s', data)
                                       
                send_pkt(tb,payload)
                n += len(payload)
                sys.stderr.write('.')
                if options_tx.discontinuous and data_pktno % 5 == 4:
                    time.sleep(1)
                data_pktno += 1
                time.sleep(0.2 + 0.05*int(random.choice([0,1,2,3])))

                if traffic_flag != True:
                    n_attempts_counter += 1
                    if n_attempts_counter > n_attempts: #get out of the data channel as it seems that the other node is still trying to rendezvous
                        mode = "sync"
                        continue

                #ch_energy = tb.rxpath.probe.level() #check if primary user is present
                time_right_now = datetime.now()
                #print "inside traffic , ticker_start",ticker_start
                packet_delay = (time_right_now - ticker_start).seconds
                #print "packet_delay ",packet_delay
                if packet_delay >= no_packet_period:
                        stop_time = datetime.now()    
                        _elapsed_time  = start_time - stop_time
                        elapsed_time = _elapsed_time.seconds
                        print "\n[[ No data packets:  Evacuating Current Channel ]]\n"
                        print "\n[[ Scanning channels for network nodes ]]\n"
                        mode = "sync"
                        mode = "sync"
                        return_flag = 1
                

                #if int(ch_energy) > 1.5e8: #if primary user is there then dont transmit on this channel
                
                

if __name__ == '__main__':
    try:
        main()
    except KeyboardInterrupt:
        pass