Changes between Version 51 and Version 52 of 802.11/wlan_exp/app_notes/dcf_with_multiple_flows

Timestamp:

Apr 22, 2014, 11:40:12 AM (10 years ago)

Author:

murphpo

Comment:

--

802.11/wlan_exp/app_notes/dcf_with_multiple_flows

@@ -36 +36 @@
 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.
 
-These statistics are sufficient to calculate total throughput, packet delivery ratio (PDR) and average number of re-transmissions per packet.
-
-||    ||||=  Flow 1  =||||=  Flow 2  =||||=  Flow 3  =||||=  Flow 4  =||
-|| Physical Carrier Sensing ||  On  ||  Off  ||  On  ||  Off  ||  On  ||  Off  ||  On  ||  Off  ||
-|| # MPDU Tx ||  51808 ||  46883 ||  51792 ||  46864 ||  114116 ||  113725 ||  121787 ||  118609 ||
-|| # PHY Tx || 65535 || 65951 || 66211 || 66090 || 140036 || 151143 || 147488 || 156835 ||
-|| # PHY Re-Tx || 13727 || 19068 || 14419 || 19226 || 25920 || 37418 || 25701 || 38226 ||
-|| # MPDU Rx || 51806 || 46820 || 51792 || 46794 || 114115 || 113597 || 121788 || 118523 ||
-|| Throughput (Mbps) || 1.97 || 1.78 || 1.97 || 1.78 || 4.33 || 4.31 || 4.62 || 4.50 ||
+These statistics for our two experiments are in the table below.
 
 ||    ||||=  # MPDU Tx  =||||=  # PHY Tx  =||||= # PHY Re-Tx  =||||=  # MPDU Rx  =||||=  Throughput (Mbps)  =||
 || Physical Carrier Sensing ||  On  ||  Off  ||  On  ||  Off  ||  On  ||  Off  ||  On  ||  Off  ||  On  ||  Off  ||
-||=  Flow 1  =|| 51808|| 46883|| 65535|| 65951|| 13727|| 19068|| 51806|| 46820||  1.97|| 1.78||
+||=  Flow 1  =|| 51804|| 46883|| 65531|| 65951|| 13727|| 19068|| 51806|| 46820||  1.97|| 1.78||
 ||=  Flow 2  =|| 51792|| 46864|| 66211|| 66090|| 14419|| 19226|| 51792|| 46794||  1.97||  1.78||
 ||=  Flow 3  =|| 114116|| 113725|| 140036|| 151143|| 25920|| 37418|| 114115|| 113597|| 4.33|| 4.31||
 ||=  Flow 4  =|| 121787|| 118609|| 147488|| 156835|| 25701|| 38226|| 121788|| 118523|| 4.62|| 4.50||
 
-It is clear that without carrier sensing all flows suffer...
+Statistics:
+ * '''PHY Tx''': total number of PHY transmissions 
 
-But the aggregate statistics do not provide enough information to understand why performance suffered. For this, we need to explore the Tx/Rx logs from each node.
+It is clear that carrier sensing improves overall throughput, and reduces the number of re-transmissions. But the underlying reason for these changes are impossible to discern from these aggregate results. For a better understanding we must explore the detailed Tx/Rx logs from each node.
 
 = Tx/Rx Log Results =