Hi Phenix There can be two possibilities to send a packet with 50% and 75% probability:
1. Generate random number, either 0 or 1 randomly. If the generated number is 0, the packet is supposed to be sent otherwise drop. 2. Generate random number between 0 and100. If the generated number is below 75, then send the packet, otherwise drop (in case of 75% Probability). Hope it answers your question. Regards Mubashir Husain Rehmani www-rp.lip6.fr/~rehmani <http://www-rp.lip6.fr/%7Erehmani> 2009/2/18 Phenix <phenix...@hhu.edu.cn> > Hi Sidney, > > Phenix, >> >> Is this discussion about probability technics or about how to >> implement them in c++? >> > > Both. > I'd like to know how can I implement probability-based mechanism in c++ > more exactly. > > >> Sidney Doria >> UFCG / BRAZIL >> >> >> >> 2009/2/18 Phenix <phenix...@hhu.edu.cn>: >> >>> >>> Hi Mubashir, >>> >>> Thanks for your advice. But I don't think this method denotes a rigorous >>> probability-based mechanism. >>> In fact, the packet may not be forwarded even with a probability of 90%. >>> But using your method, >>> it must be forwarded if only the probability exceeds a threshold. >>> >>> Any other ideas? >>> >>> Regards, >>> Phenix >>> >>> >>> From: Mubashir Rehmani >>> Sent: Wednesday, February 18, 2009 3:49 PM >>> To: Phenix >>> Cc: ns-users >>> Subject: Re: [ns] how to forward packets based on probability >>> >>> >>> Hi Phenix, >>> >>> To forward a packet with certain probability, you need to include an if >>> condition in the sendPkt() function. It should be something like this: >>> >>> If(probability > 0.5) >>> { >>> Scheduler::instance().schedule(target_, p, delay); >>> } >>> >>> in the SendPkt() function. >>> >>> Hope it helps >>> >>> Regards >>> Mubashir >>> www-rp.lip6.fr/~rehmani <http://www-rp.lip6.fr/%7Erehmani> >>> >>> >>> 2009/2/18 Phenix <phenix...@hhu.edu.cn> >>> >>> >>> >>> Hi guys, >>> >>> How to implement probabilistic-based flooding in NS-2 ? Say, upon >>> receiving a packet, a mobile node will decide whether to forward it with a >>> certain probability. >>> >>> I only know we can use the function below to send a packet in NS-2: >>> Scheduler::instance().schedule(target_, p, delay); >>> But how to deal with the probability? >>> >>> >>> Regards, >>> Phenix >>> >>> >>> >>> >>> >>> -- >>> Mubashir Husain Rehmani >>> >>> >>> >>> >> >> >> -- >> Sidney Doria >> Redes ad hoc móveis >> Doutorado em Computação >> UFCG >> Brasil >> >> "Nessa jornada, o conhecimento será o seu escudo..." >> (Mestre dos Magos no episódio do grimoire de ouro) >> >> > -- Mubashir Husain Rehmani
