Context-aware architectures

(1)

Context-aware architectures - Guy Bernard / INT - October2003 1

Context-aware architectures

Guy Bernard

(2)

Context-aware architectures - Guy Bernard / INT - October 2003 2

VTT (1)

(3)

VTT (2)

framework for Symbian OS

"blackboard-based" communication (center = context manager)

stress on

fuzzy thresholds (Bayesian reasoning)

low-level vs. high-level context values

(4)

VTT (3)

(5)

CICESE, Mexico

IEEE Computer, september 2003

(6)

Univ

. Lancaster,

ReMMoC

project

(7)

Univ

(8)

CARISMA (2)

(9)

CARISMA (3)

(10)

GET, CARISM project

Couche de communication

La couche de communication est

b asé e sur l e g r ap he de p r otocol es

de J onathan dans l e b ut de:

instancier dynamiquement un

g rap h e adap té aux co nditio ns de

l ’ env iro nnement à cet instant;

restructurer et mo dif ier ce g rap h e

si l es co nditio ns v arient p endant

l ’ ex é cutio n

C onnex ion mul tip l e: p ossib il ité

d’ util iser simul tané ment p l usieur s

connecteur s ( T C P , U D P … )

!" # $ % & % &

(11)

CARISM (2)

Le p r o j et G E T C A R I S M ( 2 / 2 )

Plate-f o r m e m o b i le

! "#$ % %& '$ ( ) * %' # + $ , + -'. , /0

Réseau

Point d ’ a c c è s

I E E E 8 0 2 . 1 1

1 2 3 4 5 6 7 78 5 9 2 : 2 ;6 < <= 7 5 ;8 4 5 6 7 >? 2 9@ 2 = 9 AB ? C

M id d l e w a r e e m b a r q u é

PDAs iPAQ ( l in u x + J V M )

Faibles ressources

(12)

CARISM (3)

Gestion l oc a l e à l ’ u nité m ob il e

API JMS

l ic a tions

M i l

M onite u r d e

r e s s ou r c e s s s tè m e s

G e s t i o n a r c h i t e c t u r e l o c a l e

@ 8 = 8 45 6 7 2 3 2 63 5 7 3 9 5 32 2 7 6; < 4 2 2 3 2 63 5 7 3 2 38 5 ; 8 4 5 6 7 3

C h o i x d e c o n f i g u r a t i o n

(13)

CARISM (4)

Simulateur

d e c o n tex te

O b s erv ateur

d e c o n tex te

I n terg ic iel

C o n tex te

G es tio n n aire

lo c al

d ’ arc h itec ture

G es tio n n aire

lo c al

d e s erv ic es

C o n f ig uratio n

(14)

ITEA Vivian project, ICM

(15)

AMPROS proposed architecture (1)

device

OS

Resource

Monitor

Resource

Monitor

Context

Recognition

Service

Appl/Users

Profiles

Appl/Users

Profiles

Context

Manager

Middleware

Manager

Middleware Core

g

e

t

c

o

n

fig

/

s

e

t

c

o

n

fig

Multi-Net

mgt

Discon.

mgt

Failure

detector

Discov.

service

Logging/

reconciliation

Appl

query/

subscribe

Middleware Services

(naming, trading, notification, persistency, ...

notify

Appl/Users

Policy

Appl/Users

(16)

Resource Monitor

1

resource monitor

for each resource ("driver") type

WiFi, TETRA, remaining battery, available memory, geolocalisation, # of

processes, …

includes some system- and device-dependent code

gets raw data and processes it in order to provide system-independent

low-level context data, e.g.:

bandwidth =>average value in the last minute

geolocalisation => x, y

pushes (periodically ??) low-level context data to

Context Recognition

Service

, e.g.:

Device:Network:WiFi:bandwidth =30

Location:Coordinates = {80.0, 140.3}

(17)

Context Recognition Service

gathers low-level context data from

Resource Monitors

returns the appropriate high-level context data, as considered by

Applications/Users Profiles

, to the

Context Manager

, e.g.:

Device:Network:*:Bandwidth = {WiFi:Bandwidth=30, Tetra:Bandwidth=0}

Applications/Users Profiles

describe the interest of individual applications, or users, or middleware

itself to monitor low-level or high-level context data, e.g.:

Device:Network:*:Bandwidth

Location:Coordinates

(18)

Policies

describe the interest of individual applications, or users, or middleware

itself to be notified when significant context changes occur, and the

associated behaviour, e.g.:

if (Device:Network:*:Bandwidth < {10} && Device:Processor > 25) then

"enable compression"

Context Manager

notifies the appropriate entity (application, user, middleware) when

significant context changes occur, e.g.:

notify "middleware", "enable compression"

notify "user", "battery low"