Hi, all, The following "Bug Fix" http://www.dei.unipd.it/wdyn/?IDsezione=2435
pointed out that " The *send* procedure begins with the 'send' method of the class 'Mac802_11' in 'mac-802_11.cc' file. First, *send* checks whether the medium is idle and no previous backoff procedure is pending. If the response is true, *send* calls the internal DeferTimer procedure, which should simulate the random backoff stage described by the IEEE 802.11 standard. Notice that, despite what dictated by the standard concerning the backoff stage the internal DeferTimer procedure DOES NOT freeze the timer contdown if the channel becomes busy, since the channel sensing procedure is not considered. For this reason, in the following we will refer to this backoff procedure as PSEUDO BACKOFF." However, this bug fix does not aim to solve this PSEUDO BACKOFF problem. My question is that if the backoff procedure does not freeze the timer countdown which is a big deviation from the standard, can we still use NS2 to do wireless simulation? It seems that a lot of research papers use NS2. Is the timer countdown freezing properly implemented in real wireless products? I would like to hear your opinion on this issue. Thank you very much! Best, Bo Wang
