Building Automation Routing Requirements in Low-Power and Lossy Networks
Note: This ballot was opened for revision 09 and is now closed.
(Adrian Farrel) (was Discuss, Yes) Yes
(Jari Arkko) (was Discuss) No Objection
The empty lines in Figure 1 make the viewing the picture hard. > Fire systems are much more uniformly installed with smoke detectors > installed about every 50 feet. The rules on this are variable, but I have actually not come across a distance metric. Typically, there is a requirement to have at least one detector per floor per firewalled area, or even one per room. > These cameras are atypical > endpoints requiring upwards to 1 megabit/second (Mbit/s) data rates > per camera as contrasted by the few Kbits/s needed by most other FMS > sensing equipment. The deployment models differ again, though. Some devices operate in motion detection mode, others stream continuously, and yet others operate as web servers and are used on a per need basis. > A ten minute power outage may require many hours to regain building > control. Traffic flow may increase ten-fold until the building > control stabilizes. I wish it were made clearer that this is an undesirable state of affairs. > Typically, sensor battery life (2000mah) needs to extend for at least > 5 years when the device is transmitting its data (200 octets) once > per minute over a low power transceiver (25ma) and expecting a > application acknowledgement. This requires a highly efficient > routing protocol that minimizes hops and hence latency in end-to-end > communication. The routing protocol MUST take into account node > properties such as 'Low-powered node' which produce efficient low > latency routes that minimize radio 'on' time for these devices. There are of course wireless sensors in a building network. However, I have serious trouble believing that the router nodes need to be in this mode. Does this requirement mean that the routers have to save power for themselves (which would be a major research project) or merely that small or at least predictable latency would save energy for hosts? Please clarify.
(Ron Bonica) No Objection
(Ross Callon) No Objection
(Ralph Droms) No Objection
(Pasi Eronen) No Objection
(Russ Housley) (was No Record, No Objection) No Objection
(Cullen Jennings) No Objection
(Tim Polk) (was Discuss) No Objection
(Dan Romascanu) (was Discuss) No Objection
(Robert Sparks) (was Discuss) No Objection
Adrian's Discuss points to feedback I provided to version -05 of this document. Please consider the points in that review that aren't also called out in Discuss a "Comment".
Magnus Westerlund No Objection
Comment (2009-09-23 for -** No value found for 'p.get_dochistory.rev' **)
Agree with Russ that the security requirements seems backwards. To me it appears that the protocol MUST have authentication, but it may not be used for specific reasons. However, I don't want to be in a building that deploys these systems without a security model. Especially if you they are using wireless communication.