Changes between Version 3 and Version 4 of 802.11/wlan_exp/examples


Ignore:
Timestamp:
Feb 12, 2014, 12:19:11 PM (10 years ago)
Author:
murphpo
Comment:

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  • 802.11/wlan_exp/examples

    v3 v4  
    1313This script uses the txrx_stats data in the reference design to calculate through in a unidirectional flow. The AP generates a fully backlogged flow of packets addressed to the station. The station counts how many bytes it has received from the AP. The Python script polls the station twice over a period of 10 seconds, recording the txrx_stats reports before and after. It then computes the number of new bytes received and the time span between reports. The script uses the timestamps reported by the node in the txrx_stats report to calculate the time span. This removes any dependence on the PC-nodes link in computing the denominator for the throughput calculation.
    1414
    15 {{{#!python
    16 import warpnet
    17 import wlan_exp
    18 from wlan_exp import wlan_exp_util
    19 from wlan_exp import wlan_exp_node_ap
    20 from wlan_exp import wlan_exp_node_sta
    21 
    22 #Initialize the 802.11 WARP nodes
    23 # Update the serial numbers below for your local nodes
    24 nodes = wlan_exp_util.wlan_exp_init_nodes(['W3-a-00001', 'W3-a-00002'])
    25 
    26 #Find the AP node
    27 n_ap = wlan_exp_util.wlan_exp_get_ap_nodes(nodes)[0]
    28 
    29 #Find the STA node
    30 n_sta = wlan_exp_util.wlan_exp_get_sta_nodes(nodes)[0]
    31 
    32 #Start a flow from the AP's local traffic generator (LTG) to the STA
    33 # Set the flow to fully backlogged with 1400 byte payloads
    34 n_ap.config_ltg(n_sta, LTG_CBR(1400, 0))
    35 
    36 #Experiment parameters - trial time and PHY rates to test
    37 TRIAL_TIME = 10
    38 rates = (R6, R9, R12, R18)
    39 
    40 #Result arrays (filled in by the loop below)
    41 rx_bytes = []
    42 rx_time_spans = []
    43 
    44 for ii,rate in enumerate(rates):
    45   #Configure the AP's Tx rate for the selected station
    46   n_ap.set_tx_rate(n_sta, rate)
    47 
    48   #Record the station's initial Tx/Rx stats
    49   rx_stats_start = n_sta.get_txrx_stats(n_ap)
    50 
    51   time.sleep(TRIAL_TIME)
    52 
    53   #Record the station's final Tx/Rx stats
    54   rx_stats_end = n_sta.get_txrx_stats(n_ap)
    55 
    56   #Compute the number of new bytes received and the time span
    57   rx_bytes[ii] = rx_stats_end['rx_bytes'] - rx_stats_start['rx_bytes']
    58   rx_time_spans[ii] = rx_stats_end['timestamp'] - rx_stats_start['timestamp']
    59 
    60 #Calculate and display the throughput results
    61 for ii in len(num_rx[ii]):
    62   #Timestamps are in microseconds; bits/usec == Mbits/sec
    63   xput = (rx_bytes[ii] * 8) / rx_time_spans[ii]
    64   print("Rate = %2.1f Mbps   Throughput = %2.1 Mbps", (rates[ii], xput))
    65 
    66 }}}
    67 
    68 ----
     15[[Include(source:/ReferenceDesigns/w3_802.11/python/warpnet_example_wlan_throughput.py)]]