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A real-time MAC protocol for wireless: Virtual TDMA for Sensor (VTS)

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(9)

Sq#:

SLEEP:

CRC:

1 byte 2 bytes 2 bytes 1 byte 1 byte 2 bytes 2 bytes

CRC T DEST SRC S Sq# SLEEP

DEST:

SRC:

S:

T:

Source address State (used as schedule identity)

Time to sleep period (ms) Cyclic Redundancy Code Sequence number Destination address

Packet type{RTS,BCAST,SYNC}

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5Ð`@bshig `@YZQSJ@o‚ú@IkhP` u@Ig FIKJZg wabWGÐwl\'g IyF|Wo%IKy×h Fwl\Pù€J @DK^é\]w[bFGRYaI 5M³QWJ@o‚úRI%h'Q.Ikgº`@g \

\ mbWo Fg `@bWwaTKJ hiw[`@b+JZbWy+y wl\iok` u@Ig RURg I\iIkg u J hiw[`@b+JZbWy+úRIkIkQFL_J@Yaw[u@I º|FbWo$h wa`RbW\D

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MPI%h

T C

SIh w2I\iY[`ZhÚy |Fg‚J h wa`RbPD ,Nb+J2\iwabWG@Y[I%L F`@Q+o%Y[|W\‡h Ikgw[b+\]hiIKJ@y sLN\‡h‚J h I˜ûßw±DI@D[UWJZY[Ydh WI bF` y I\J@giI˜h FI³` ùbFIg \×`ÚJ8hiw2I\iYa`@h‚ý!J@b âyFJ h‚J+hig‚JZbW\2w[\ \iwa`Rb .I%h‡ùIkIbþh‡ù`5bF` y I\

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T 0

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T 1

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(10)

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o%Y[|W\‡h Ikg‚\2bFIkuRIkg2ù€JZú@I+|FQ÷J hh FIf\ J2I­h w2IRUthi`éJvuR`@wlyéw[bRh IkgiL_okYa|S\‡h Ikg2wabsh IkgºIkg IkbWokI\D

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\io FIKy |FY[I\Ut\]w[bWo%I+h FI JZg I8w[bWy IQSIbWy Ikbsh Y éw[bFwahiwlJZY[waTIy¸Dtö Ww[o 2IJ@bW\zh WJZh³usw[gihi|WJ@Y

\]|FQ.Ikgºg‚J2I\8wabãIkuRIkg okYa|W\]hiIg+J@giIâhiw2I%LN\ FwÝhiIKy¸D(,Nbæh Fw[\5oJ@\iI@US`Rg y Ig8bW`myFI\+\]II

\]Iu@Ikg‚JZYq\io FIKy |FY[I\8JZbWyæJRy `@QFh8JZY[Yq`h FI+D^ }×ef^ `@Q.Ikg‚J hiw[`@b wl\8J@Y[\i`;y IQFwlo$hiIKy

wabüh FIàI(7FJ2QFY[Iâ` WG@|WgiI



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A 1

U

A 2

U

A 3

J@bWy

A 4

D øÚ` y IK\wab­h FI!\iIo%`RbWy o%Y[|W\‡h IkgEJ@giI

B 1

J@bWy

B 2

D  `³o%YlJZg w% 8w[y IKJ@\UFY[I%hE|W\qJ@\ \]|˜Ih WJ h

A 1

wl\ÚJ .`@g‚y IkgÚbW`myFI

SIkh‡ùÐIIkb8h FI×h‡ù`2okYa|S\‡h Ikg‚\

A

J@bWy

B

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B

DPMPIkh!|W\bF`Zh I˜h WJZh!^ }×ef^ \iIJ˜Y[I\ \iY fJ@YaY[` ùÚ\qJ5y w4dIkg Ikbsh!bs|*.Ikg`bF` y I\w[b IJ@o 5o%Y[|W\]hiIgD

T0 T1

T3

T4

A1 B1 A2 B2 A3 A1 A4 B1 A1 B2

time

A2 A1

T3

CTL/Data/Sleep cycle

1 2 3 4 1

1 2 3 4 1

2

B1

A1 B2 A1

A4 A3 A2 Cluster A/Cycle Tc

Cluster B/Cycle

SUPERFRAME ATDMA

 "! Ç.Ç Û ~ÚÙ2Û•N™R  „NŠ[„]ƒk†!!‚žv‰’“™@…‡Ž‰KˆáÊHœ…‡‘5…ŒÊ‰³ƒ–kç_ƒ‚‚ˆ …א‚’Ž™s•_…‡ „‡•9Ì

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A 1

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okJZbWbF`ZhúsbW` ù÷wab+ù# Fwlo ­\io WIy |FY[I×IJ@o ­`'wah \bFIwaG '.`@g‚\Hwl\DsX Úc³\]hiw[YaYdù`@g ú \ .IokJ@|W\iI

h FIgiIHwl\'J@Yaù€J \PJÚo WJ@bFbFIYR\iIkbW\iItQSIgiw[` y .I)º`@g Ith g J@bW\2wl\i\iw[`@bPU)W| h'h FIHYlJ hiIbWo) 1"!M*

> ( FI(.`@g‚y Ikg1bF` y I€ùwaY[YF\i|/4.Ig ºgi` FwlyFy Ikb˜bF` y Io%`RYaY[wl\]w[`@bW\DvøÚ` y I\

wabfJRy<]J@okIkbshEo%IYaYl\ùw[YaYP` ùb+h FI9\ J2I\]Y[`ZhÚw[báQWJ@wag‚\kUFoJZ|W\iw[bFG³o%`RYaY[w[\iw[`@bW\JZhh FI .` y Ikg

bF` y I@D

( FIkg I)º`RgiIRUkX Úc 9|W\]h IbW\i|FgiIÐbF`@b9` u@Ikg YlJZQFQFw[bFGÚ\ o FIyF|FYaIK\kD,NbzJ@b ×oJ@\iI@Uv^ }qef^

okJZb .IÚIJR\]w[Y 9J@o Fw[IkuRIy˜JÝh IkgHg |FbFbFw[bFGJbFIkh‡ùÐ`RgiúsL_Y[J RIkgo%Y[|W\]hiIkg w[bFG!QFg `Zhi` ok`@Y Y[waúRI /0UT1_U

h WJZhEokJZb+\ WwÝhE\iYaIIkQ+hiw2I SIkh‡ùÐIIkb5\]|FQ.Ikgºg‚J2I\DF^h€h FI 2`2IbRhKU ùÐI!JR\i\i|2I×h WJZh

S`Rg y IgHbF` y IK\ÎJZY[ù€J m\t\iIkIEbF`@b L_` u@IgiYlJZQWQFwabWG×\ o FIyF|FYaIK\kD,Nb³Jo%Y[|W\]hiIgiIKy2bFI%h‡ù`@g údUZùw“h

g J@bWy ` wabWw“h w[J@Yaw[TJZhiw[`@bPU@h Fwl\Hwl\ÎJg IJR\]`RbWJFY[IJ@\ \]|˜QFhiw[`@bPDRö÷w“h ³J 0%L0 TVy | h& 2o) o%Y[I@U

y w4dIkg IkbshE\ o FIyF|FYaIK\JZg IqY[w[ú@IkY h ` SI!w[b­h FI ZL CTWV g IJZw[bFw[bFGzhiw˜IRD

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E\iwabFG˜^ }qeâ^U w[bRh g JZL_okYa|S\‡h IkgHQWJRo‚ú@Ikh \ SJvu@IqJ S`R|FbWy IKy³YlJ hiIbWo) 2`

L intra ≤ N C T C

ûÝh WI\iJ˜I!JR\h FI\iwabWG@Y[I%L F`@Q8`@Q.Ikg‚J hiw[`@b.ý$D ,NbshiIg]LNo%Y[|W\]hiIkgYlJ h IkbWo ³wl\€I(7 QFg I\ \]IKy  

L inter ≤ X

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}

L i−intra

û.Rý

L i−intra

y IkbF`@hiIK\Îh FIwabsh g JzY[JZhiIbWo) `Ph FIwaL

th

okYa|W\]hiIg€wab8h FIQWJZh ºgi`Ô\]`R|Fg okI ûWg‚\‡h³okYa|W\]hiIg‚ý9h ` yFI\]hiw[bWJ h wa`RbãûºYlJ@\]h³o%Y[|W\]hiIkg$ý+ûÝh Fw[\³gi`R| hiI+w[\yFI%hiIg2w[bFIy  é|FQFQ.Ikg

YaIu@IkY1QFg `Zh `mok`@Yl\ ý%DSM'I%h

N H

.Izh FIzbs|*.Ikg×` F`RQW\Ew[báh FIzQSJ h èû

N H

wl\qJ@Yaù€J \h WI bs|*.IkgÚ`1o%Y[|W\]hiIg \w[b+h FI!QSJ h 2w[bs|S\`@bFIvýJZbWy

N C i

h FI }×ef^

h FI!waL

th

okYa|S\‡h IkgKUmh FIb2

L inter ≤ (T C

X

i

N C i ) ≤ (N H + 1)T C max

i {N C i }

û+sý

( Fw[\€g IkYlJ h wa`RbW\ FwaQ F`RY[yF\º`RgÚJZb âûßwabshiIg`@gw[bshig‚J LNo%Y[|W\‡h Ikg$ýÎyWJ h J˜I7 o SJZbFGRI@D

F`@gÎh FI\ JZú@IE` okY[J@giwah& @URYaIkh|W\J@\ \i|2IÚh SJ hÐbW`myFI

A 4

ù€JZbsh \Hhi`˜\]IbWy­J9QWJ@o‚úRI%hHh ` bF` y I

B 2

wabþh FI2\ o%IkbSJZg wa`³` WGR|FgiI  D ( FI˜QWJ@o‚úRI%h 9|W\]h .I2y IkY[wauRIkg Iy5h Fg `@|FG fh WI QWJ h

A 4 → A 1 → B 2

D,Nbshig‚J LNo%Y[|W\]hiIkg

A

h g J@bW\2wl\i\iw[`@b8û

A 4 → A 1

ý J7mw9|ÜY[JZhiIbWo)

w[\€GRwauRIkb ' ­I

 D 0@D ,Nb+h WI!ùÐ`Rg \]h€oJ@\iI

A 4

QWJRo‚ú@I%hJZg g wauRI\J h

A 1

‡|S\‡hEJÝhiIkg

A 1

\]Y[`Zhw[b h FI˜o%Y[|W\‡h Ikg

B

ûßJR\E\ F` ùbáw[bfY[JSIY D+w[báh FI9I7 J2QFYaIvý$D ( FIkb'USJ º|WYaYJ@yFyFw“h wa`RbWJZY

B

\]|FQ.Ikgºg‚J2Iwl\Eg I



|Fw[giIKy+hi`+o%`2QFY[I%h Ih FI

A 1 → B 2

hig‚JZbW\2w[\ \iwa`RbéûºYlJ.IkY   w[bfh WI

WG@|Fg IKý%D'( WIkg I)º`@g I@U@wab­h Fwl\ÎI7FJ2QFY[I@U

L inter ≤ L A−intra + L B−intra = (4 + 3)T C = 7T C

D

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