Future of Wireless? The Proximate Internet

Future of Wireless? The Proximate Internet
Rajiv Laroia
COMSNETS, January 7, 2010
FlashlinQ – Direct Device-to-Device
Communication Technology
Over Licensed Spectrum
No Infrastructure Needed
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Where We are Today
•  Wireless
–  WAN
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1G – Analog voice
2G – Digital voice
3G/4G – Broadband data/voice
No notion of physical location or proximity
–  LAN
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WiFi
Bluetooth
Ad hoc networks (WiFi P2P mode)
•  Wired
–  Ethernet – local
–  Internet
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Global
No notion of physical location or proximity
We Are Social Beings That Interact With The
Physical World Around Us
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FlashlinQ – The Vision
Consider a Place
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Perhaps a “Neighborhood”
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or the “Mall” nearby
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or your “Home”
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or someone’s “Office”
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...and how these
places
relate to
people
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and things,
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and wireless,
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And then consider...
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amidst these places,
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the Internet is being Embedded.
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Sometimes with great fanfare! (3G)
(all people will be connected!!!)
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but more often silently…
(so will all things…)
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And then consider...
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that your mobile Internet device
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walks about as if blindfolded
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to its
Physically-Proximate
Internet.
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Need for a Proximate Internet
Proximate Internet compliments the Internet, does not replace it
Mobile/fixed ‘devices’ communicate with nearby mobile/fixed ‘devices’
Think of devices as ‘higher layer entities’ such as applications or services
•  Location based services over 3G networks
–  Mobile-to-fixed (could also be mobile-to-mobile)
•  Bluetooth based proximate services
–  File/content sharing – mobile-to-mobile
–  Local advertising – mobile-to-fixed
•  WiFi based in home services
–  Apple devices using Bonjour – mobile-to-fixed or fixed-to-fixed
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Current Solutions for Proximate
Internet - Centralized
•  WAN-GPS based approach
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Mobile WAN devices determine location using GPS
Devices communicate their location to a ‘God-Box’ in the network
God-Box tracks all devices
God-Box informs devices of services and mobiles in their vicinity
•  Issues with WAN-GPS based approach
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GPS consumes power
GPS unreliable Indoors
Privacy concerns with God-Box tracking everything
Uses expensive WAN capacity
Does not cover non-WAN devices
Does not scale well for high device density
Closed business model – slower innovation in services
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Current Solutions for Proximate
Internet - Distributed
•  WiFi based
–  Generally mobile-to-fixed infrastructure
–  Mobile-to-mobile with WiFi P2P mode
•  Bluetooth based
–  Direct device-to-device communication
–  Master/slave devices (not P2P)
•  Issues with WiFi/Bluetooth based approaches
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Device discovery power hungry – no automatic discovery
Very small range – cannot be increased (unlicensed spectrum)
Existing Phy/Mac not designed to scale with device density
No power efficient paging capability in WiFi
Evolution of standard preserves Phy/Mac for backward compatibility
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FlashlinQ Overview
Requirements of Proximate Internet
FlashlinQ
•  Discovery – establishing need to communicate
–  Devices (application) discover all other devices within range (upto ~ mile)
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Capable of discovering thousands of devices
Identify only authorized devices (privacy maintained)
–  Automatic power efficient discovery every 10 seconds
•  Paging – initiating communication
–  Link established through paging
–  Paging ability once a second
•  Communication
–  Once link established, devices can securely communicate
–  ~2 msec framing
–  All pairs that can coexist communicate simultaneously
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Orthogonalization/reuse tradeoff - high system capacity
Synchronous technology
Licensed spectrum
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System Vision
•  One must be able to see many things…
•  One should see a higher layer entity…
•  One must be able to speak with what one sees…
•  One must be able to trust that which one speaks with…
•  One’s IP sessions should move to/from FlashLinQ as necessary…
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Proximate
D2D NAN
(Neighborhood Area Network)
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Autonomous Advertisements…
School:
Polling Place
Mobile
Notary Public
Grocer ->
½ off Salami
Local
Seamstress
Taxi: for Hire > Heading to
NYC, need a
ride?
Courier: for
Hire
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Discovering what one
cares about nearby…
Good to
know
Johnny is
near home
The
“Neighborhood
Watch” Cmte
A Family
out for
the day
A School
Field Trip
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Communicating with it…
“Media Swap”
In-building
Automation Control
Mobile Social Network
“Profile Matching”
“Multi-player”
Neighborhood Gaming
“Proximate Contextaware Gaming”
“Vouch” – building
3rd-party Trust Nets
“FlashPay” – eCash
between eWallets
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FlashlinQ: A Clean Slate Approach to D2D
Buddy
Gamers
Desired link
Advertisers
Interference link
Unknown
Discovery
D2D Communication
FlashlinQ
1.  Discovery Autonomicity, Range and Number of Devices
2.  Self Organized Device-to-Device (D2D) Communication
3.  Session Mobility to/from FlashlinQ & Cellular/WiFi/etc.
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Autonomous Expression Advertisements…
Incoming Adverts
All uniquely visible and
trackable
Even as I advertise
FlashlinQ Devices “see” past each other
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Ad Hoc Direct Transmission to Nearby Devices
FlashlinQ Devices
dynamically trade-off
spectral reuse and
orthogonality
1) Slot-by-slot, halfduplex scheduling
(devices cannot
simultaneously
send and receive)
2) Each slot contains a
“feasible” transmission
link set (senders
cannot “blind”
receivers)
3) Unicast (and
Broadcast) support
FlashlinQ Devices can “talk” past each other
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Technical Challenges in FlashlinQ design
•  Large wireless dynamic range >100 dB
–  All wireless systems need to deal with this range
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WAN – unrestricted association
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WiFI – orthogonalization
–  FlashlinQ – timing synchronization & slotted orthogonalization
•  Half-duplexing
–  Device cannot transmit and listen at the same time
–  While device is transmitting, it cannot monitor signals from other devices
•  TDD
–  Traditional TDD has a predetermined FL/RL partition
–  Unlike traditional TDD, TX and RX partition in P2P may not be fixed a priori or
determined by a centralized controller
•  Distributed scheduling
–  WAN – centralized scheduling by the basestation
–  FlashlinQ – distributed scheduling where each device independently decides to
transmit or not
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Applications of FlashlinQ
•  Coordinate unlicensed spectrum communication
–  Multichannel WiFi – discovery & paging
–  White-space communication
•  Social networking
–  Discover friends in the vicinity
–  Find people that share common interests
•  Mobile advertizing
–  Neighborhood stores – products & services
–  People offering services
•  Remotely control devices around you
•  …
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Thank You
Questions/Comments?
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