[ns] AODV Simulation with Moderate to Large Traffic Load

[Wang Qiang <engp0442@nus.edu.sg>]

> Dear ns users:
> 
> I'm trying different levels of loading to a 50-node ad hoc network in
> 1500mx300m area.  Since default ns2 wireless media link capacity is 2Mbps,
> the following loading levels results from calculation:
> 
> 1. Light loading:   20 CBR conneections sending 64-byte packets at 4
> packet
> per sec
>    Loading factor = 20 x 64 x 8 x 4 / 2M = 0.03 erlang = 3%
> 
> 2. Moderate loading:  30 CBR connections sending 512-byte packets at 8
> packet per sec
>    Loading factor = 30 x 512 x 8 x 8 / 2M = 0.49 erlang = 49%
> 
> 3. Heavy loading:  30 CBR connections sending 1024-byte packets at 8
> packet
> per sec
>    Loading factor = 30 x 1024 x 8 x 8 / 2M = 0.98 erlang = 98%
> 
> However given moderate loading at above, NO single scenario has ever
> complete successful so far!  Not to mention the case of heavy loading.
> The
> simulation ALWAYS core dump halfway with a "eval.c 41: no such file or
> directory" error.  This error did happen with even the light loading case,
> but much less frequently and could be bypassed by replacing a new scenario
> file. However this method apparently doesn't work with moderate loading
> and
> heavy loading!
> 
> Has anyone experienced similar problem or tried to simluate large traffic
> before?
> All comments are welcome!
> 
> Thank you.
> 
> wangq
> 
>