[Tinyos-help] About TOSH_READ_RADIO_CCA_PIN()

[JeongKwanhee]

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> 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/
Washington State University 

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