On Sun, Feb 13, 2011 at 9:15 AM, Nicole Chiesi <[email protected]> wrote: > I am facing a situation where , I use the TestNetwork Application in testbed > of about 45 telosb motes. I was trying to check the saturation point of ctp. > I increased the packet rate to some 1 packet per second for about 15 nodes > and one packet every 8s for > the rest 20 motes. I still have a very good delivery ratio of about 98 > percentage. > How much of data rate is ctp supposed to handle?
CTP is not designed to work with high data rates. It does not limit the number of packets injected into the network. So, you should try to operate it under channel saturation. What rate will cause channel saturation? That will depend on the radio, MAC, network topology, ... > When I went down to 3packets /sec for the 15 nodes and one packet /8s for > the rest of the nodes , then was only significant drop in the delivery ratio > to about 74 percent. > I think the results I got are not accurate? i do not know if I did something > wrong here? You are sourcing 45+ packets/s. Many of these packets might be multi-hop which means the region around the sink is receiving and sensing many more packets. You might be way past channel saturation. If the channel is not saturated, it is reasonable to expect a decent performance. - om_p _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
