Bahman,
ususally the "Event UID not valid!" error means that an event in the event list has a time that is lower than the current time, or that the handler (the timer in your case) was deleted before the event was extracted from the list. So I suggest you to look for strange behaviors of your code, which may cause the event to be scheduled with a negative time. hope this helps, Marco >----Messaggio originale---- >Da: [EMAIL PROTECTED] >Data: 4-mag-2007 5.30 PM >A: <ns-users@ISI.EDU> >Ogg: [ns] Scheduler error in 802.11 > > >Hi, > >I'm simulating a simple wireless (802.11b Basic Mode) experiment. At the >end of the >simulation, I get this error: > > "Scheduler: Event UID not valid!" > >I understand that the message is being initiated from >/ns/common/scheduler.cc file line 93 only because the UID of an event is >positive. In other words, an event with positive UID cannot be scheduled >again. > >Now, I'm using a timer to introduce a fixed delay for each packet -either >control or data packet- passing through the interface layer. When I >introduce 1 to 39us of delay to my system, the simulation works perfectly >and as expected (i.e. there is a fixed delay for the transmission of each >packet reflected into my trace file). However, when I increase this delay >to 40us and above, then run the simulation I get the above error. I have >adjusted the timeouts in the ns/mac/mac-802_11.cc as well so that my packets >are not all dropped. > >Please let me know if you have any ideas or thoughts about this. Where do >you think I should look at first? What could the problem be? > >Thanks, > >Bahman > >_________________________________________________________________ >Txt a lot? Get Messenger FREE on your mobile. >https://livemessenger. mobile.uk.msn.com/ > >
