Re: [Roll] ETX metric

[Maxence Dalmais <maxence.dalmais at insa-lyon.fr>]

Hi Phil ,

I am saying that when using wireless links, a node should be aware that his communication could interfere with other communication.
Less powered is the transmission signal, less noise is seen by neighbours.

It also means that it's more greatly affected by interference from neighbors: there is no free lunch.

 

Could you please be more clear?
I'm not sure I understand quite well.

 

A low powered node will also need less energy to communicate in a less noisy environnement.

In low-power wireless chipsets, CMOS dominates power costs. E.g., a chip that draws 60mW transmits at 1mW. Reducing transmit power typically does not conserve much energy.

Thank you for this information.
But keep this assumption as it assumes that hardware will not evolve in coming years.

I totally aggre with you to say that we need an abstract notion of cost.
But I think that we can not consider only the receiver and transmitter but that we have to consider all the nodes on which the transmission has an (good or bad) effect. Sure, there will be a huge difference between wireless and wired links.

A good effect of a high powered transmission from a main node to another node could be seen if some nodes are using ambient radio radiation to stay up.
For each nodes, the cost will be different depending if the node is involved in the transmission in receiving, routing, or not directly involved but in being affected by it.

Maxence.