[ns] MaxHelloInterval and MinHelloInterval function in aodv

[saaidal@um.edu.my]

Hi all,

I just want to ask what does MaxHelloInterval and MinHelloInterval
really menas and do in aodv code?

It really puzzlaes me thuis code in aodv.cc from line 166 to 173:

void HelloTimer::handle(Event*) {    agent->sendHello();    double
interval = MinHelloInterval +                  ((MaxHelloInterval -
MinHelloInterval) * Random::uniform());    assert(interval >= 0);
Scheduler::instance().schedule(this, &intr, interval); }
why the value for hello timer (i assume that's hello message
interval) is equal to  MinHelloInterval +
((MaxHelloInterval - MinHelloInterval) * Random::uniform());

for the old version of ns2 (version 2.1x), it does not have these
MaxHelloInterval and MinHelloInterval

should it be as simple as HELLO_INTERVAL x ALLOWED_HELLO_LOSS?

it's defined in aodv.h from line 119 to 123:

#define HELLO_INTERVAL          1               // 1000 ms #define
ALLOWED_HELLO_LOSS      3               // packets #define
BAD_LINK_LIFETIME       3               // 3000 ms #define
MaxHelloInterval        (1.25 * HELLO_INTERVAL) #define
MinHelloInterval        (0.75 * HELLO_INTERVAL)

i'm not quite understand what does this MaxHelloInterval and
MinHelloInterval do, if anyone can explain to me, it will be much
appreciated..

I also have tried simulation with both AODV-LL and AODV-HELLO, and
seems that the performance is quite match (AODV-LL is better by maybe
0.1 % for high mobility scenario), for me it does not make any
sense...

is something wrong with the AODV ns-2.34 code?