Changes between Version 41 and Version 42 of 802.11/wlan_exp/app_notes/dcf_with_multiple_flows


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Timestamp:
Apr 21, 2014, 9:58:23 PM (10 years ago)
Author:
murphpo
Comment:

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  • 802.11/wlan_exp/app_notes/dcf_with_multiple_flows

    v41 v42  
    1515||  '''Experimental Setup'''  ||
    1616
     17=== Experiment Details ===
     18 * Packet Length: 1400 byte payloads (1428 bytes OTA with MAC header and FCS)
     19 * PHY Rate: 18 Mbps (QPSK, code rate 3/4)
     20 * Tx Power: -5 dBm
     21 * Trial Duration: 300 seconds
     22 * 2.4GHz channel 1
     23 * Physical Carrier Sensing Threshold: approximately -70 dBm when enabled
     24
    1725We use 4 traffic flows in our experiments:
    1826 * '''Flow 1:''' Backlogged traffic from AP to STA_1
    … …  
    2432
    2533The colors in the figure above are used throughout this app note to denote each flow.
     34
     35== Analysis #1: Aggregate Results ==
     36The simplest analysis uses the aggregate Tx/Rx statistics at each node. These statistics include the total number of packets and bytes transmitted and received for each flow, and the number of successful packets and bytes for each flow.
     37
     38These statistics are sufficient to calculate total throughput, packet delivery ratio (PDR) and average number of re-transmissions per packet.
     39
     40As illustrated below the aggregate statistics mask some interesting MAC behavior changes when carrier sensing is disabled.
     41
     42
     43||  -  ||=  Flow 1  =||=  Flow 2  ||=  Flow 3  ||=  Flow 4  =||
     44|| Tx Pkts || 1 || 2 || 3 || 4 ||
     45|| Rx Pkts || 1 || 2 || 3 || 4 ||
    2646
    2747== Experiment 1: Physical Carrier Sensing Enabled ==
    … …  
    4060
    4161=== Aggregate Results ===
    42 The simplest analysis uses the aggregate Tx/Rx statistics at each node. These statistics include the total number of packets and bytes transmitted and received for each flow, and the number of successful packets and bytes for each flow.
    43 
    44 These statistics are sufficient to calculate total throughput, packet delivery ratio (PDR) and average number of re-transmissions per packet.
    45 
    46 As illustrated below the aggregate statistics mask some interesting MAC behavior changes when carrier sensing is disabled.
    4762
    4863=== Log-based Results ===