On Thu, May 29, 2008 at 12:06 AM, Dima Kogan <[EMAIL PROTECTED]> wrote: > Hi. I would like to set up a multihop, power efficient network with > TinyOS. I have basic CTP working, but I would like to get answers to a > few simple and general questions before I get in too deep. > > 1. It seems like CTP is the preferred system I should be using, since > it has a TEP, but I also see mention of LQI. Is there a document > somewhere that describes LQI? Should I be considering it at all? Are > there other algorithms out there that I should be looking at?
Those are the two collection protocols included in the core distribution. There might be more in contrib. > 2. I'm using the CC1000 radio, so I have RSSI measurements available > to me. Looking at the LinkEstimator codes (le and 4bitle), it's not > obvious to me that these are using RSSI. Should they be? Is this > something that I should code up myself, or is there a fundamental > reason that RSSI is not appropriate here? 4bitle uses one bit of information derived from RSSI (in case of CC1000) - was the link good or not? It might be difficult to build a routing protocol that uses only RSSI as its routing metric, but it might be possible to do so if you can make some assumptions about your environment. CTP tries to be platform-independent which is why it does not use actual RSSI values from CC1000. > 3. My motes need to run off of a single battery charge for a very long > time, so low power listening is very highly desireable. Reading the > forum archives, it seems like CTP+LPL is not very thoroughly tested > and that they don't play nice together currently. Is this correct? Are > people achieving power efficiency through other ways? Is the right > answer to write something myself? We are testing this combination. There are other ways to achieve energy efficiency too. SCP-MAC is an example. - om_p _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
