[Tinyos-help] About TOSH_READ_RADIO_CCA_PIN()

[raysaikat at gmail.com]

Probably only one is transmitting at a time due to. CSMA.
Sent via BlackBerry from T-Mobile

-----Original Message-----
From: "JeongKwanhee" <khjeong at gist.ac.kr>

Date: Mon, 16 Jun 2008 20:59:15 
To:"'renjie huang'" <huangrenjie.hust at gmail.com>
Cc:tinyos-help at millennium.berkeley.edu
Subject: Re: [Tinyos-help] About TOSH_READ_RADIO_CCA_PIN()


Your opinion is right. 
I think so. 
But, in experiment rssi value, I confused above conclusion. 
For example, when 1---à0 exists just only one pair, we assume measured rssi value of 0 node is -80dBm. 
After that, added 3---à2 by adjacent node of 0 node. 
But, rssi value of 0 node is still -80dBm. If it already considers interference from adjacent nodes, rssi value have to lower than -80dBm. 
  
How do u think about it? 
  
_________________________________________________________ 
Kwanhee Jeong, M.S. Student 
_________________________________________________________ 
  
 
From: renjie huang [mailto:huangrenjie.hust at gmail.com] 
 Sent: Saturday, June 14, 2008 1:27 AM
 To: JeongKwanhee
 Cc: tinyos-help at millennium.berkeley.edu
 Subject: Re: [Tinyos-help] About TOSH_READ_RADIO_CCA_PIN() 
  
 
Hi 
 
  
 
You want to verify whether TOSH_READ_RADIO_CCA_PIN() work correctly or what? It already consider interference from ajacent nodes.  "I just think that it compares to rssi and cca.". This rssi is a sampling of environment noise.
 
   
 
On 6/13/08, JeongKwanhee <khjeong at gist.ac.kr <mailto:khjeong at gist.ac.kr> > wrote: 
 
 
Hello, all members of TinyOS 
  
In general TinyOS, TOSH_READ_RADIO_CCA_PIN() is able to use some function if we want to check the state of channel. 
But, I don't know how to calculate whether channel is clear or not. 
  
I just think that it compares to rssi and cca. 
But, in this case, I think it does not consider the interference of adjacent nodes. 
For example, SINR. 
  
So, I want to check TOSH_READ_RADIO_CCA_PIN() function, and then to fix this function. 
  
If you know about this, please contact to me. Thank you. 
  
_________________________________________________________ 
Kwanhee Jeong 

 Tel: +82-62-970-3147
 Cell: +82-16-387-6870
 Fax: +82-62-970-2291 
_________________________________________________________ 
  

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 -- 
 Renjie Huang
 Sensorweb Research Laboratory 
 http://sensorweb.vancouver.wsu.edu/ <http://sensorweb.vancouver.wsu.edu/> 
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