hi, Ahmad:
======= 2006-03-31 23:40:43 Ahmad Khayyat wrote: =======
>2) assoPermit means whether the node should permit other nodes to
>associate with it so that it becomes their coordinator. Look at the
>802.15.4-2003 standard for details.
>
>5) This is not how LossModel is used. Consult ns-manual for the correct
>usage. It still applies for wpan.
Thanks, I'll look into the document.
And I have another question. This is a snippet from wpan_demo2.tr, I find that
all tcp packets sent out is always 7 bytes bigger than the received packets.
Why do they not have the same size? Then which one(97 or 90) is the real size
of the tcp packets?
s 11.928192000 _0_ MAC --- 255 tcp 97 [0 5 0 800] ------- [0:2 5:0 30 5] [133
0] 0 0
s 11.931712033 _5_ MAC --- 255 ACK 5 [0 0 5 0]
r 11.932064067 _0_ MAC --- 255 ACK 5 [0 0 5 0]
r 11.932704033 _5_ MAC --- 255 tcp 90 [0 5 0 800] ------- [0:2 5:0 30 5] [133
0] 1 0
>Bruce Who wrote:
>
>>------------------------------------------------------------------------
>>
>>Hi, all:
>>
>>Recently I begin to learn how to use ns2 to run wpan simulations, and stumbled
>>by some problems, hope someone could help me out.
>>
>>1)I found there are some commands like this:
>>eval $ns_ attach-agent \$node_($src) \$udp_($src)
>>
>>why don't we just use this command?
>>
>>$ns_ attach-agent $node_($src) $udp_($src)
>>
>>2) for this command
>>$node sscs startCTDevice <isFFD = 1> <assoPermit = 1> <txBeacon = 0>
>><beaconOrder = 3> <SuperframeOrder = 3>
>>
>>what does assoPermit mean?
>>
>>3) I ran wpan_demo2.tcl and found that all extended addresses of nodes are
>> [0]. Is it necessary to set the address to different values by ourselves?
>>
>>4) I ran "nam wpan_demo2.nam" and found that data stream is only seem between
>> PANCoor(node0) and node1. But we have such statements in the wpan_demo2.tcl
>> script:
>>
>> ftptraffic 0 1 $appTime1
>> ftptraffic 0 3 $appTime3
>> ftptraffic 0 5 $appTime5
>>
>>So why could no communications be seen between node0 and node3/node5?
>>
>>5) And how to set lossmodel for nodes in wpan? I tried following code, but it
>> doesn't work:
>>
>>set loss_module [new ErrorModel]
>>$loss_module set rate_ 0.01
>>$loss_module unit pkt
>>$loss_module ranvar [new RandomVariable/Uniform]
>>$loss_module drop-target [new Agent/Null]
>>eval $ns lossmodel $loss_module \$node_($src) \$node_($dst)
>>
>>Any help would be appreciated! Thanks in advance!
>>
>>
>>
>>Best regards,
>>
>>Bruce Who
>>
>>
>>
>
= = = = = = = = = = = = = = = = = = = =
Best regards,
Bruce Who
2006-04-02
