Hi, First, you e-mail subject indicates the 802.11e while in your code you are making reference to 802.11. Second, according to my liitle knowledge, only the basicRate_ and the dataRate_ (which is not set in your script) can have an effect on the 802.11's throughput. basicRate_ is the rate used to send control packets (RTS, etc) while dataRate_ is used to send data packets. To better understand this, I suggest you to view the 802.11's code and this url (http://linear.engmath.dal.ca/ns-2/doxygen/html/annotated.html) let you browse it very easily. Also, you can read this very good summary, titled (Understanding the implementation of IEEE MAC 802.11 standard in NS2 ) on the 802.11 implementation in NS that could be found at : http://www.cs.binghamton.edu/~kliu/research/ns2code/. Joshua Robinson's comments are also a good summary. Good luck.
> Date: Thu, 1 Feb 2007 11:21:13 -0800> From: [EMAIL PROTECTED]> To: > ns-users@ISI.EDU> Subject: [ns] Urgent: bandwidth allocation in IEEE 802.11e> > > > Hi> I am working on wireless ad hoc networks. > I have simple scenario in > which one node is sending packets to other.> I set packet size 512 bytes and > interval between each packet is 0.0025.> it means application layer (CBR) > generate total 1/0.0025 = 400 packets in a second. Each packet is 512x8 = > 4096 bits (512 bytes).> It means application layer is generating 1.6384 Mbits > per second. > I have set,> ============================> Mac/802_11 set > bandwidth_ 11Mb > > Mac/802_11 set PreambleLength_ 144> Mac/802_11 set > PLCPHeaderLength_ 48> Mac/802_11 set PLCPDataRate 1.0e6 > Mac/802_11 set > dataRate_ 20M> > Mac/802_11 set ShortRetryLimit_ 7> Mac/802_11 set > LongRetryLimit_ 4> Mac/802_11 set MinimumBandwidth_ 11mb> > ===================================> Sending application layer is generating > packets at rate of 1.6384 Mbps but receiver is getting data at rate of just > 0.7 Mbps, which is very less, almost half.> Interesting thing is that when I > change > Mac/802_11 set PLCPDataRate 1.0e6 > to> Mac/802_11 set PLCPDataRate > 11.0e6 > because I need total 11 Mbps bandwidth. this throughput increases > from 0.7 to 0.8 Mbps but still not 1.6384 Mbps.> > would be greatly thankful > to you If anybody solve my problem.> > Looking to get kind response from > yourside. > Regards> Azam> > > Muhammad Azam Akram> MSc Communication & > Interactivity> Linköping University,> Linköping, Sweden.> Address: > Tröskaregatan 11, > Lambohov 58333, > Linköping, Sweden.> Mobile: 00 46 73 > 569 06 77> > > ---------------------------------> We won't tell. Get more on > shows you hate to love> (and love to hate): Yahoo! TV's Guilty Pleasures list. _________________________________________________________________ Live Search: Better results, fast http://get.live.com/search/overview
