[ns] AODV performance
Hello everyone, I am simulating AODV with HELLO messages in ns2. However, I have ran 5 simulations with different traffic and movement patterns (which are generated using the following settings) and the average packet delivery ratio is only around 70% ? Where in some paper I have seen the ratio could be as high as 95-98% with the similar simulation settings. However, if I increase the packet rate from 2 to 4 or even 6, then the results are much closer to the other published results. Could anyone please please kindly suggest me what could be the possible reasons that causes poor packet delivery ratio results at lower offered load? I dunno what settings i should be changing in the ns2 tcl script. Actually I'm trying to follow the standard settings for Lucent WaveLAN. so, the bandwidth should be 2Mbps. I know if i increase the bandwidth , the packet ratio would be higher, but is there any other reasons that could help me to get a better ratio at lower offered load. My simulation settings are * 2200x600 dimension, * 100 nodes * max node speed is 20m/s * Packet rate 2 pkt/sec * Simulation time 500 sec * Pause time 100 sec * 40 CBR source * 2Mbps shared media bandwidth * 64 pkts in sending buffer * 30 sec for timeout before dropping packet from sending buffer Thank you very much Regards, Martin
[ns] ifqueue->length() for Interface Queue Length
Hello everyone, I am looking for the correct place to retrieve the interface queue length of each individual node during simulation runtime. I'm using the AODV protocol in the simulation and I realise that there is a member variable in aodv.h called the ifqueue, which is the pointer to the object PriQueue. And from the class file packet.h I saw a method called length() that could retrieve the length of the queue. So can I simply use "ifqueue->length()" from the aodv.cc to retrieve the interface queue length of the node? Thanks in advance Regards, Martin
[ns] AODV with HELLO message
Hello everyone, Im working with AODV in ns2 and I would like to detect link breakage with HELLO message instead of Link Layer Detection. According to the AODV source code, do I simply comment out the line "#define AODV_LINK_LAYER_DETECTION" in "aodv.h" ? Is there any other changes I have to make in the code to achieve what I want? What about the local repair? Thanks in advance Regards, Martin
[ns] [AODV] How to get the length of node's interface queue
Hello everyone, I have working on a load balancing strategies for AODV. Can anyone teach me how to get the length of the current node's interface queue? Thanks in advance. Regards, Martin =
[ns] Calculating Average End-to-End Delay is slow with awk
Hi everyone, When you all calculating the average End-to-End delay for a particular simulation, do you take all of the recv entries? (that is if there is 2 receives, you will gather all 2 to calculate the average) However, the number of receives packets is very large ~19 at some stage and the calculation time of the end-to-end delay take ages. I'm using awk to calculate the average delay and at the moment I only take few thousands of recv entries from my trace file. (Which I think its not very accurate.) So do anyone of you know a better way to calculate the average delay fast with all the recv entries? Thanks in advance Regards, Martin
[ns] [AODV] Interface Queue and AODV packet queue
Hello everyone, I am doing project regarding to monitor each node's packet queue length in AODV. However, there are two queue lengths in ns2 src code that makes me confused. The `interface queue length` and the `Drop-front queue` in AODV src file "aodv_rqueue.cc". If I want to get the packet queue length of each node during simulations, should I get the length of the interface queue or the length in aodv_rqueue.cc ? interface queue length or rqueue.len_ ?? Regards, Martin
[ns] Patching AOMDV into ns2
Hello everyone, Do anybody in this forum know the way to patch the original AODV in ns2 into AOMDV? I have got the AOMDV source code for ns-allinone-2.14ba. But I do not think I can simply replace the original AODV files with the AOMDV source files and everything will work. Can anyone please please help me out on the procedures to install AOMDV for later release of ns2? Thank you very very much. Best regards, Martin
[ns] AOMDV implementation for ns2.30
Hello everyone in ns2, I am currently working on a load balancing strategy on the AOMDV protocol. I'm using ns2 and I am not able to find the AOMDV (Ad-hoc Multipath Distance Vector) source code within the ns2 directory? After hours of googling, I managed to find a copy of AOMDV source code for older version of ns2. http://www.icis.ntu.edu.sg/wagio/campus/research/codes/aomdv-code-ns2.tar.tar However, the installation steps provide with the source code require me to install an older version of AODV onto the new ns2 and some overriding of ns2 original source code. Does anybody able to install AOMDV into ns2.3x ? I will be very grateful if you can teach me how to do it correctly. Thanks in advance. Martin
