In RPL -routing protocol for LLNs- if we have 2 nodes A and B, we say that node A is in the transmission range of node B if A receives DIO message from B, and we also could say that B is in the transmission range of A if B receives A's DIO. So, we conclude that both nodes are in each other transmission range. My question is could the ETX of the link between two nodes be an indicator if they are in the transmission range of each other? is there any other way?
http://stackoverflow.com/questions/29195287/how-to-find-the-other-mobile-nodes-in-transmission-range-of-a-fixed-node
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&ved=0ahUKEwjsh7Dw38DTAhXJMI8KHSdKCfsQFgg4MAM&url=http%3A%2F%2Fwww.cs.jhu.edu%2F~dholmer%2F600.647%2Flecture7-infrastructure-and-ad-hoc-networks.ppt&usg=AFQjCNGOpFolOGh7TcF6zEyucy1q6s-TLg&sig2=0bCX-JW4p-BpwIx1J4vMbg&cad=rja
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/rpl/configuration/15-mt/rpl-15-mt-book.html#concept_56DDF281D4494D4FB807695739F4D142.
Are you talking about the ETX per the RFC "The ETX Objective Function for RPL" ?
You need to keep in mind that RPL operates in L3 where as the transmission range is typically dependent on the PHY layer radio properties.
In general two nodes are in transmission range is the Received SINR is greater than then receiver sensitivity.
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