ROLL%20Routing%20Requirements;%20The%20connected%20home

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ROLLRouting RequirementsThe connected home

• Anders Brandt
• March 2008

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The connected home

• A world of Buzzwords...
• Home Control or
• Home Automation or
• Intelligent Home or
• Smart House or
• ...(pick one)

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The connected home
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Entering a room
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Entering a room, v.2
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Leaving home
OFF
OFF
OFF
OFF
OFF
OFF
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Leaving home, Contd

• Turn off group
• User experience matters
• Lamps must (appear to) react at the same time
• Visible lamps typically within direct range gt
• Address group unacknowledged
• Address individual nodes to ensure new state
• IP Multicast is not the solution
• IP Multicast requires subscription from targets
• Groupcast is needed (bitmap addressing in subnet)

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Moving nodes

• Media center is within direct range of remote
  control

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Moving nodes, Contd

• Media center is within direct range of remote
  control
• Now the user walks to the kitchen...

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Moving nodes, Contd

• Remote control is out of range

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Moving nodes, Contd

• Remote control must find available routers

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Moving nodes, Contd

• Router is used to talk to media center

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Devices in the home

• Lamp module
• Switch module
• Movement sensor
• Smoke alarm
• Remote control

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Devices in the home, Contd

• Lamp module Switch module
• Static location
• Always on
• Distributed all over the house
• Obvious routing resources
• (battery backup is rare)

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Devices in the home, Contd

• Movement sensor Smoke alarm
• Battery-operated
• Mounted in inconvenient places
• Important to safety
• Battery lifetime optimized via 99 sleep mode
• Requesting remaining battery is difficult
• Node only listens rarely
• Routing should be avoided

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Devices in the home, Contd

• Remote control
• Battery-operated
• Mobile
• Only wakes up when operated (or moved)
• May have to remember several gateways
• Not attractive as routing resource

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draft-brandt-roll-home-routing-reqs

• Application use cases
• Specific routing requirements forthe connected
  Home
• A comment on traffic patterns

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draft-brandt-roll-home-routing-reqs

• Support for multiple paths. Nodes may be
• failing
• powered off
• moved
• Ability to locate a working path within 250ms
• Neighbor discovery must be smart or frequent
• Consumers move nodes at will ...

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draft-brandt-roll-home-routing-reqs

• Groupcast
• Ability to address a set of devices, e.g. lamps
• Reveiving nodes are grouped by the sender(IP
  multicast receivers join a group individually)
• Bug all devices (multicast) should read all
  devices (broadcast)

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draft-brandt-roll-home-routing-reqs

• Constrained routing
• Routing must respect node limitations
• CPU speed
• Memory size
• Battery capacity
• Sleep intervals
• Safety(Do not drain the battery of a smoke
  alarm)
• convenience of changing battery(Do not drain the
  battery of a ceiling-mounted sensor)

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draft-brandt-roll-home-routing-reqs

• Scalability and traffic patterns
• Support 200 nodes in a subnet (Many
  sensors/light devices in a future home)
• Large systems structured into many subnets
• (Cabled) backbone
• Managability
• Security
• Isolating problems(all the usual IP reasons)

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draft-brandt-roll-home-routing-reqs

• Traffic patterns
• Central lighting control
• any-to-one one-to-many(all switches talk to
  the central controller. Controller controls
  light)
• Distributed mesh system
• any-to-many(many controllers/switches control
  light devices directly)

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Conclusion

• Unique requirements to routing
• Real applications - it is out there already...
• Should be considered in protocol studies
• Comments are welcome on the list

• Anders Brandt
• abr_at_zen-sys.com