MOBILE COMPUTING PESONAE
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`MOBtLE WORKSTATIONS vs PDAs
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`David L. Cohn
`Distributed CompulJng Research Laboratory
`University of Notre Dame
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`Just what, will we de with hJghly mobiJe computers,
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`and what are the sysf,em software implications?
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`Mobile workstations Ialso portable corr~pulers, notebooks, etc,)
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`Fully configured computers
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`Sreen, keyboard, disk, etc,
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`Big enough f,o do iL at[ ......
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`PDA (Personal Digital Assistant, such as NewlorL Eo, etc.),
`MJnirtlaF eompuler D
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`Wireless Cam municalion
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`Stoat] enough to carry all of the tdme
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`Notre Dame - Distributed Computing Ftesearch Laboratory--~j
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`Notre Dame - Distributed Computing Research Laboralory ¯
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`DO WE NEED PDAs?
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`WHAT IS A COMPUTING PERSONA?
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`Qusetion: Is there a "killer application" that will make PDAs ind[spensible?
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`Persona Manager
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`Hint: It is not rearFy an application
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`Clue: (from en Apple TV commerdal)
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`’~¢¢hat’s on your Powerbook is you!"
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`Answer: Perhaps - it depends on, the evoJution of ubiquitous computing
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`Portable workstetion - carry you whole ever you go
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`Unlvera-d connectivity - leave you home and access remotely
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`hlobEle Personae - re-establish you at your IocatJon
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`Active Applications ~ Name Space
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`/\ ./, \
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`By you, we mean your computing persona
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`Cennect’°ns ~. 1 ~
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`Notre Dame - Distributed Computing Research LaboraLLory~j
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`Notre Dame - Disf,ribuf,ed Computing Research Lobo[ato#/.--~j
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`Corn munica[ion I ] I User Interface
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`IS PERSONA NEW?
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`MOBILE WORKSTATIONS AND IMPLICIT PERSONA
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`Whenever a user logs [n to a computer, a persona Js established
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`Be a turtle and carry your home with you - Mac Duo, for exeJeple
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`Each user customizes his or her persorra
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`Persona has a passive parl and ar~ active part.
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`Passive part. fiJes, devices, not, work eonReoiJons
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`Act,ire part -running appJications, corn m unication links
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`With multiple computers, a user has muJtipIe perso~iae
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`Must, manually force consisf,ency
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`Copy flies, restart applications, rebuild eommu~ieations
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`A ma}er pain
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`Problem s:
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`Podable maehJrles are never as powodul as 17xed machines
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`Portable is a x,’utneralule single point-of-failure
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`Upgrades are traumatic
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`Does not solve the mu[f,iple machine prebrem
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`Q
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`LG Electronics, Inc. et al.
`EXHIBIT 1004
`IPR Petition for
`U.S. Patent No. 7,149,511
`Page 1 of 2
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`UBIQUITOUS COMPUTING AND PERSONA
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`EXPLICIT MOBILE PERSONA
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`f~sume unwersal connectivity, say v4thin a building
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`Use PDA as active badge and portable user interlace
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`ParcTab, for example
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`Agent resides on a fixed computer
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`Movem~fl~
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`PDAs reporl user Iocaton, allow remote control of applications
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`Problems:
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`Need universal connectivity - wifl it ever happen?
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`Assumes significant computing structure in place
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`Office
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`In transit
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`Home
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`PDA as a persona CarTier - could also use a network
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`Notre Dame - Distributed Computing Research Laboratory---.-j
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`Notre Dame - Distributed Computing Research Laboratory-~-j
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`USER’S ViEW OF MOBILE PERSONA
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`OBJECTIONS TO PERSONA
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`Persona movement managed by PDA
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`Assumes PDA is with user at all times
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`PDA carries persona or network reference
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`~ ~ ~r~.~
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`Persorla is imposed on computing resources
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`User initiates process, resources could be a collection of eiements
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`Environment is recreated based o~t available resources
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`Can change dynamically
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`Must accemodate limited resources
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`A U
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`"A persona [s just a files system - like AFS"
`AFS allows users to establish fire access from most anywhere
`Response - must evolve AFS and add active part
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`"I’m schizophrenic - I have multiple personae]"
`Company.confidential tires at work, games at home
`Response - personae are [ocation dependent
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`"It’s net a ’persona’, it’s jusl- the ’user environment’!"
`It is aclually what the user sees, not really lhe user
`Response - perahps [t should rook like:
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`<:D
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`Notre Dame - Distributed Computing Research Laboratory------"
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`Notre Dame - Distributed Computing Research Laboratory~--~
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`PERSONA’S INTERNAL ORGANS
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`FILE SYSTEMS AND MOBILE PERSONA
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`Note: organ transplants allowed and encouraged
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`File system - an evolution of drscennected lile systems - like Coda
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`Persona is the client, not a specific machine
`"Client-hess" moves through a sequence of machines
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`Information repository - a generalized tiJe system
`Relaled to P(ospero and Wodd Wide Web
`Multiple storage sites, multiple access protocols
`Flexibte locking end chaching
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`Mobile app]icatiens - including [he persona manager
`Eg: a "follow-me word processo¢’
`Must be ab]e to stop, move and restart - need "effective state"
`Must preserve communication links - portable sockets, not mobile ]P
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`Fires have a permanent !lome on a server
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`Persona caches fires and makes updates
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`Fires a~e "flushed" back to server
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`Similar to AFS and Coda
`AFS allows client machines to cache files
`Coda adds abifity for clients to be disconnected
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`Persona may move to other machines
`return to serverlrom another location
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`Files may
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`Persona leaves state behind
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`Useful if persona carrier dies
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`Notze Dame - Distributed Computing Research Laboratory-~-j
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`Nobe Dame- Distributed Computing Research Laboratory~’ji
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