02 - ΣΔΥ50 - ΟΣΣ5 - adhoc networks.pdf
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()
.., GSM, GPRS, 3G, WiFi (BS)
BS
BS
BS
3
IP
Server Router
Gateways
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;
; ..
; ..
,
; ..
4
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adhoc
adhoc
: ,, ..
parking ( ) (, , PDA,
, ) 5
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: () ,
: aptops
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A H , (Mobile ad hoc networks,
MANETs)
(Wireless sensornetworks, WSNs)
7
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/
:
(.. )
( )
( ): BS
,
( ) 8
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,
,,
: / (
9
?
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:
( !) ad hoc ,
MANETs:
10
H ( )
..
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:
: :
, ..
multiho
:
11
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(WPAN)
:
/
Adhoc
Laptops, desktops,
13
Personal AdPersonal Ad--
hochocConnectivityConnectivity
ReplacementReplacement
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(ISM) 2.4 GHz
720Kb/s
FHSS, (2.402 2.480 GHz > 79)
master
8 piconet (1master 7 slaves)
piconets scatternets
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;
ad hoc
master slaves piconet.
M
SS
S
SB
P
(hopping pattern).
piconet
hopping pattern/ID master
7 200+
(parked) slaves piconet 15
P
M=Master
S=Slave
P=Parked
SB=Standby
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S; Scatternet
piconets
master slave.
M
SS
S
SB
P
P
.
radios ( radio master slave)
, piconet () 720 Kbps
16
M
S
P
SB
M=Master
S=Slave
P=Parked
SB=Standby
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; ,
(flooding) (control overhead)
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()
(tabledriven)
()
(OnDemand)
/
!
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D S
R (DSR)Ondemand
,
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DSR
A ROUTE REQUEST (RREQ) (local broadcast)
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A B C DE
[]
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DSR
, ROUTE REPLY(RREP) . RREP
. ,
22
A B C DE
[, ]
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( S N, SN), (selforganized, adhoc)
(sensors)
WSN (sink)
, WSN , , .. , , wireless mesh networks,
( ) 24
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SN;
: ,
25
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(sensor field)
(sink)
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SN
Sink
27
(sink).
.
;
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, ,
/,
,
, /,
,
,
, , , ,
, 28
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( )
Location finding system Mobilizer
ProcessingunitSensing unit
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Processor
StorageSensor ADC
Transceiver
Power unit Powergenerator
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WeC 99Smart Rock
Mica 1/02
Rene 11/00
Telos 4/04RobustLow Power250kbpsEasy to use
30
Small microcontroller8 kB code512 B data
Simple, low-power radio
10 kbps ASKEEPROM (32 KB)
Simple sensors
NEST open exp. Platform
128 kB code, 4 kB data40kbps OOK/ASK radio512 kB Flash
Designed forexperimentation
-sensor boards-power boards
Dot 9/01
Demonstratescale
Spec 6/03Mote ona chip
Mica2 12/0238.4kbps radioFSK
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SN
,
(disconnections)
:
(sink)
(latency) sink
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SN (Fault Tolerance)
To
(Scalability)
/ (.. )
(Hardware Constrains)
/ < 1 $ ;;
32
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SN (Sensor Network Topology)
(predeployment),
(deployment) (postdeployment)
(Environment)
, , , ,
33
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SN (Transmission Media)
(.. radio, infrared, opticalmedia)
(Power Consumption)
:
(sensing)
( )
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SN
WSN
: (sensors)
:
, (sink)
()
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(PA): Route 2(ME) : Route 1
(MH):Route 3 PA: Route 3
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MAC : SMAC :
,
Tradeoff:
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SYNC ( SYNC ) RTS
CSMA/CA
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MAC : B
To SMAC ( )
ZigBee ( 802.15.4) :
(FFD)
(RFD) RFD
FFD
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MAC : B
ZigBee , beacon ( FFD)
beacon
()
:
beacon
( CSMA/CA)
: timeslots
. 39
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