The Hocman Prototype

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The Hocman Prototype

• Fast Motor Bikers and Ad Hoc Networking

Mattias Esbjörnsson Oskar Juhlin Mattias Östergren
INTERACTIVE INSTITUTE
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Motor Bikers Activities

• Leisure
• Social
• Visual
• Interaction occurs
• opportunistically
• because it is organized
• co-movement
• place-centered movement

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Motor Bikers Activites Illustrated
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Design Requirements

• Added Value augment rather than rationalize
• Simultaneous Activities user attention varies
• Social Interaction sustain encounters

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Design Requirements Continued

• Identification - better means to get to know
  others
• Invitation for Joint Rides selecting
  participants from previous encounters
• Heterogeneous User Groups biker culture is
  diverse

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Hocman

• Prototype service for mobile platform
• Handheld devices (Pocket PC)
• IP over single-hop ad hoc networking (IEEE
  802.11b IBSS)
• Ad hoc networks requires no infrastructure
• Vast area
• Approximating encounters
• Peer-to-peer architecture

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Hocman in use
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Hocman architecture
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Rapid Mutual Peer Discovery

• Each node keeps a list of known peers
• When timer for entry expires remove it from list
• Each node broadcasts a hello message at regular
  interval
• When node A receivs hello message from node B
• If present(B) reset Bs timer
• Else append B and send reply(A,B) message
• When C receivs a reply(A,B) message
• If not present(A) and (present(B) or BC) append
  A

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Rapid Peer Discovery Illustrated
B
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Performance Tests

• Early implementation of RMPD HTTP GET
• 3 peers (2 stationary 1 mobile, 70 km/h)
• Refined version of RMPD
• 2 peers (1 stationary 1 mobile, 160 km/h)
• Feasible to perform user evaluation

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Hocman meets the requirements

• Added value awareness of encounters and
  information sharing.
• Simultaneous Activities automatic background
  downloads. HTML browser.
• Social Interaction Logging encounters. Images,
  audio clips.
• Identification Icon and downloaded pages.
• Invitation for joint rides Phone numbers, URLs,
  e-mail address.
• Heterogeneous User Groups HTML is flexible.

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Questions and Comments

• www.tii.se/mobility/Biketalk/
• Source code, binaries and reports available!
• mattias.esbjornsson_at_tii.se
• mattias.ostergren_at_tii.se

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User feedback

• Field experiment resembles natural setting to a
  high degree.
• Interviews obtain holistic data on usage