[ns] VoIP over IEEE 802.11 simulation scenarios
Van.Dinh at csiro.au
Wed Dec 16 21:50:46 PST 2009
From: Dinh, Tuan (ICT Centre, Marsfield)
Sent: Thursday, 17 December 2009 11:16 AM
To: 'ns-users at isi.edu'
Subject: VoIP over IEEE 802.11 simulation scenarios
What I about to enquire maybe the old concept but I have tried to search around but couldnt find the answer.
The question is how to simulate the VoIP traffic in the WLAN infrastructure mode in term of scenario? ( For example, I want to have 4 mobile nodes (clients) to send VoIP traffic (UDP packets 60 bytes/ 20ms) to the other and all the traffic must be reach the AP first, AP acts like the bridge). ( node 0 is AP, node 1 sends udp packets to node 2 and vice versa, node 3 sends udp packets to node 4 and vice versa - basically there are 2 calls going on)
Initially, I made use the code in ns example folder (~ns-2.34/tcl/ex/802.11/infra.tcl). The routing protocol used is DumbAgent.
Later on, one of my colleague suggested that the nodes will connect direct to the other and not through AP if I use this scenario, and she suggested another scenario that all the sinks [Agent/Null] should be placed at the AP (node_0) and all the traffic send direct to them. It appears to me that scenario worries only the uplink but not downlink.
Please let me know your thoughts
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