[ns] MAC/802.11 "STA" error on ACK

2007-03-29 Thread Ren.Liu
Hi, I'm doing some reliability study on 802.11. I sent CBR packets from node 0 to node 1. The distance between the two nodes is changing. I found that when the distance is more than 700m, the transmitter seems always drop the ACK coming back from the receiver, and give an error state of "S

[ns] 802.11 xRetryLimit_ implementations incorrect

2009-02-03 Thread Ren.Liu
The 802.11 implementations of ShortRetryLimit_ and LongRetryLimit_ are incorrect: if you set the ShortRetryLimit_ to 7, you would expect the STA to retry for 7 times (total number of transmissions of 8). However, ns-2.33 STA only retransmits 6 times (total number of transmissions of 7). The sam