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for CommunicationNetworks

Channel Confguration

Objectives

The participant is able to

explain a given channel confguration

Contents

1 Channel Configuration Overview

2 Control Channel Configuration2.1 Dedicated Channels

2.2 Random Access Channel2.3 Paging and Access Grant Channel

3 Etended Channel !ode

" Eercises

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1 Channel Confguration Overview

"n the ra#io inter$ace %& t'o subban#s $or the (T)-*) #uplex connection arespecife#+

%plin, % *)-(T)

890 -91 *./ -)*900 2pri&ar ban#880 -91 *./ 5-)*900 2exten#e# ban#1710 -178 *./ )1800876 - 880 *h/ )*- 2 ( 36180 -1910 *h/ )1900 2 ( 36

o'nlin, (T)-*)

93 - 960 *./ -)*900 2pri&ar ban#9! -960 *./ 5-)*900 2exten#e# ban#180 -1880 *./ )18009!1 - 9! *h/ )*- 2 ( 361930 -1990 *h/ )1900 2 ( 36

The ra#io $re:uenc channel spacing in !00 ,./; allo'ing 1!4

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2# $3#% !&'(# !&'

)P*+,- $)*%

1# !h'1(/# !&'

$//0% /0 !h'1(10 !&'

ransmit and of themoile station

C12"

$1("%3("

C

3

C

2

C

1

200 &'

DO4,*+,- $D*%

GSM 900

DCS 1800

50 !h'1//0 !&'

01...............12"#12...............//# (#....102"

R6C,$Asolute R6 channel numer%

C 7 radio fre8uenc9 channel $R6C%

Guard andnot used

$2#% 3# !h'1/0# !&'

ransmit and of the asestation

C12":

$1(":%3("

C

3:

C

2:

C

1:

2# $3#% !&'(# !&'

Du;le Distance "# !&' res;. # !&'

E

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5ach

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=;eech

Channels

$6ull@&alf%

Data

Channels

$Data Rate%

Control

Channels CC&

rafficChannels C&

Logical

Channelsroadcast

Control

Channel CC&

Dedicated

Control

Channel DCC&

Common

Control

Channel CCC&

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Paging ChannelPC&

Access Grant

Channel AGC&

Random AccessChannel RAC&

Common

Control

Channel CCC&

;aging of a != in all cells of alocation area for a moile

terminating call $!C%

answer to a random access>

assignment of dedicated

signaling channel

!= re8uests a dedicatedchannel from networ

identification of neighour cells

$handover%

identification of CC&

fre8uenc9> != fre8uenc9

s9nchroni'ation

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6ast Associated

Control Channel6ACC&

=low Associated

Control Channel

=ACC&

=tand Alone

Dedicated

Control Channel=DCC&

Dedicated

Control

Channel DCC&

in and signaling channel $;eriodic%B

downlinB s9stem info> ;ower command> A

u;linB measurements $level 8ualit9%>

short messages service

out of and signaling channel forB

call setu; signaling> short message service

$=!=%> location u;date $*)P%>+!=+ attach@detach

in and signaling channel $s;oradic%B

handover signalingchannel mode modif9B s;eechdata

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Channel Organization in a Cell

Gn )() (!1 the $ollo'ing channel co&binations are allo'e#+

T.F< B

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The ti&eslots 17 run in the !6 $ra&e organi/ation

A

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( Control Channel Confguration

"ntro)uction*

Gn a *"; *T; % the *) has to re:uest an ). using the A. There is a ti&e#ela bet'een the re:uest an# the ). allocation #ue to the traEc loa# G$ there is a$ree ).; it is allocate# using the A. The ). is use# $or the authentication;trans&ission o$ cipher para&eters an# call initiali/ation >ext a traEc channel isre:ueste# an# allocate#; i$ available A$ter this; the ). is relaese# The *)ac,no'le#ges the allocation on the

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-xa,ple or Channel Confguration

Assu&ptions+ ! &5rl T. oa# per subscriber

4 &5rl ). loa# per subscriberno loa# proble& on . 2re$er to chapter !!

Cell with ( T./* 16 channels

onfguration A onfguration (

1 co&b .F). 4 ).

1 T.

unco&b .

1 ).F8 8 ).

14 T.

oDere# T. loa# at 1 I bloc,ing

811 5rl )ubscriber 811 F 00! ? 0(

oDere# T. loa# at 1 I bloc,ing

73 5rl )ubscriber+ 73 F 00! ? (2

oDere# ). loa# at 1 I bloc,ing087 5rl )ubscriber 087 F 0004 ? (13

oDere# ). loa# at 1 I bloc,ing313 5rl )ubscriber+ 313 F 0004 ? 43(

%&CCH li,ite)* (13 subscriber TCH li,ite)* (2 subscriber

Confguration $ is the better one or this scenario

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(+( .an)o, !ccess Channel

.!CH

apacit o$ the A.

The A. is use# b the *) to re:uest a #e#icate# channel; the ). The channelre:uest nee#s one A. ti&eslot The cause $or the channel re:uest can be a pagingresponse in *T; an e&ergenc call; a *"; % or G*)G attachF#etach Accor#ing to thetraEc &o#el $ro& chapter 1 there are about 4 A. activities per subscriber per hour

onfguration o$ the A.

The A. is confgure# onl uplin,; his $re:uenc correspon#s to the #o'nlin, (.$re:uenc The A. &a be co&bine# 'ith the uplin, part o$ the ). Gn theco&bine# case; the A. is &ultiplexe# onto !7 ti&eslots 0 out o$ 1 o$ a(.co&bine# These !7 A. are sprea# over the &ulti$ra&e as $ollo's+

))))))))))))))))))))))))

'ith ) ? ).F)A. an# ? A.

The A. can also be confgure# unco&bine# on all ti&eslots 0; !; 4; 6

This gives the $ollo'ing capacities; the $ra&e #uration is 46 &s 2perio# bet'een t'osuccessive ti&eslots 0+

co&bine#+ !7F1 o$ all ti&eslots 0 ?J 400000 A. slots per hourunco&bine#+ ti&eslot 0 ?J 800000 A. slots per hourunco&bine#+ ti&eslot 0;! ?J 160000 A. slots per hour 2not in(!1unco&bine#+ ti&eslot 0;!;4 ?J !340000 A. slots per hour 2not in (!1unco&bine#+ ti&elsot 0;!;4;6 ?J 31!0000 A. slots per hour 2not in(!1

Gn a cell 'ith 000 subscriber nor&all there are about !0 000 A. activities per houronl KK

.!CH control para,eter

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.!CH bus5 threshol); #efnes a threshol# $or the signal level #uring the A. burstsThe (T) &easures the signal level on each A. ti&eslot an# #eter&ines 'hether achannel re:uest is success$ull receive# or not+ G$ the receive# signal level is greaterthan or e:ual to the value o$ A.(T then the A. burst in :uestion 'ill be in#icate#as bus 2one or &ore &obile stations have trie# to access the net'or, The purpose o$this para&eter is to avoi# unnecessar loa# on the ()) b nor&al noise signals being#eco#e# as A. bursts 2$ollo'e# b sei/ure o$ ). b &ista,e .o'ever; to be onthe sa$e si#e the (T) #oes not onl evaluate the A. level but a##itionall #eco#es the)nch se:uence bits o$ the A. burst>ote+ The value entere# $or this para&eter is not onl relevant $or the .A>>55L%5)T &essage on the A. but also $or the .A>"M5 A5)) &essage on the

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The *) recieves the A. control para&eters $ro& the base station on the (. +

*axi&u& nu&ber o$ retrans&ission 2 &axNretrans *AX5T ? 1; !; 4; 7

G$ a channel re:uest is not ac,no'le#ge# b the base station; the *) repeats the re:uestuntil the given value o$ *AX5T

>u&ber o$ slots to sprea# trans&issions 2 txNinteger >)"T)T ? 0;1 representingthe real values

o$ 3; 4; ; 6; 7; 8; 9; 10; 11; 1!; 14; 16; !0; !; 3!; 0

This value #eter&ines the ti&e perio# bet'een sen#ing o$ t'o channel re:uests Thisperio# is &easure# in A. slots an# is the su& o$ a #eter&inistic part t# an# a ran#o&part tr+

M% tx'integer t) 6.!CH slots7co,bine)8

t) 6.!CH slots7unco,bine)8

hase1

----- 41 203 sec 20! sec

3; 8; 14; 0 41 203 sec 20! sec

4; 9; 16 ! 204 sec 76 203 sec

hase!

; 10; !0 8 200 sec 109 200 sec

6; 11; ! 86 207 sec 163207 sec

7; 1!; 3! 11 2100 sec !172100 sec

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",,e)iate !ssign,ent ;roce)ure*

The proce#ure is specife# in )* 0408; chapter 331!+

=elect RAC& slot for

net transmission>

wait for grant

set timer 3125

wait for grant

4A+

3122

=DCC&

Allocation

,

I

I

,

,

I

numer of

retransmissions 1

numer of

retransmissions 7 0

=elect RAC& slot

for first transmission

+!!ED+AE

A==+G,!E,

PROCED)RE

no.of retransmissions

7 maHretrans

immediate

assignment

=end C&A,,E*

REJ)E= msg.

GRA, during

=u;. time

ReKection

CE**

RE=E*EC+O,

,

I

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-valuation o ",,e)iate !ssign,ent ;roce)ure or )i

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txNinteger &axNretrans bloc,ing2I 90I :uantile2s 9I :uantile2s

3 1 !9 C 01 033 ! 11 C 01 033 4 0! C 01 03

3 7 C 001 C 01 04

7 1 16 C 01 10

7 ! 04 C 01 107 4 01 C 01 10

7 7 C 001 C 01 10

14 1 09 C 01 04

14 ! 01 C 01 0414 4 C 001 C 01 04

14 7 C 001 C 01 04

! 1 06 C 01 08! ! C 01 C 01 08! 4 C 001 C 01 08

! 7 C 001 C 01 08

0 1 0 C 01 0

0 ! 01 C 01 00 4 C 001 C 01 0

0 7 C 001 C 01 0

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The results o$ these stu#ies sho'; that even the A. &ini&al confguration 2co&bine#A.F). is able to serve 0000 A. activities per hour at a lo' bloc,ing 2C 0I'ith an acceptable 'ait ti&e An unco&bine# A. is able to serve t'ice the traEc loa#

'ith the sa&e gra#e o$ service The &ini&u& bloc,ing $or the consi#ere# traEc loa# isachieve# b the $ollo'ing setting o$ para&eters+ &axNretrans ? 7; txNinteger ? 0

Though a co&bine# A. can serve the expecte# traEc loa#; another A.confguration &a have to be choosen The A. is onl the uplin, part o$ the .The #o'nlin, parts 2A.;. &a nee# a higher capacit There$ore; the confgurationo$ . is #eter&ine# b the capacit nee#e# b the #o'nlin, channels; the A.confguration is uncritical

(+0 ;aging an) !ccess @rant Channel

;CH : !@CH

The paging channel an# the access grant channel share the sa&e T*A $ra&e &apping2&o#ulo 1 'hen co&bine# onto a basic phsical channel The channels are share# ona bloc, b bloc, basis The in$or&ation 'ithin each bloc, allo's the *) to #eter&ine i$ itis a paging or an access grant &essage 5ver paging channel can be use# b thesste& as access grant channel but it is not allo'e# to the sste& to use access grantchannels as paging channels .o'ever; to ensure a &obile a satis$actor access to thesste&; there is a control para&eter to #efne a fxe# nu&ber o$ access grant bloc,s inthe 1 &ulti$ra&e The nu&ber o$ bloc,s reserve# $or A. is broa#caste# on the (.The nu&ber o$ available paging bloc,s is re#uce# b this nu&ber

aging channels &a be use# as access grant channels but not vice versa There$ore it is

use$ul to set the para&eter ()NAN(O)N5) to the s&allest value an# let the sste&organi/e the use o$ channels Gn case o$ *" &ore A. are nee#e#; in case o$ *T&ore . are nee#e# Gn average the nu&ber o$ *" is higher than the nu&ber o$ *TG$ the ()NAN(O)N5) value is set too high 'ith the result o$ a . shortage; aoverloa# in#ication $or the . &a arise in high traEc ti&e

Gn )* traEc &o#el the paging per subsriber per hour is 093

The secon# para&eter to be set is calle# ()NAN*

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CCCH Loa)

paging &essages per hour+ )%() H ANsi/e H *TNph H 55T FsubscrNperNpagN&essage

ran#o& &essages per hour+ )%() H 2*TNNph B *"Nph B %Nph B G*)GNph B)*)Nph

access grant &essages perhour+

)%() H 2*TNNph B *"Nph B %Nph B G*)GNph B)*)Nph F subscrNperNagchN&essage

)%() nu&ber o$ subscribers 'ithin the cell

ANsi/e nu&ber o$ cells on the location aea

*TNph &obile ter&inating calls per subscriber per hour 2'ith an# 'ithoutpaging response

55T &ean nu&ber o$ repetitions o$ a paging &essage 2no paging response tofrst paging

*TNNph &obile ter&inating calls per subscriber per hour 'ith paging response tofrst paging

*"Nph &obile originating calls per subscriber per hour

%Nph location up#ates per subscriber per hour

G*)GNph G*)G attachF#etach per subscriber per hour

)*)Nph short &essage service re:uests per subscriber per hour

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CCCH Loa) 6-xa,ple8

paging &essages per hour+ )%() H ANsi/e H *TNph H 55T FsubscrNperNpagN&essage

access grant &essages perhour+

)%() H 2*TNNph B *"Nph B %Nph B G*)GNph B)*)Nph F subscrNperNagchN&essage

ran#o& &essages per hour+ )%() H 2*TNNph B *"Nph B %Nph B G*)GNph B)*)Nph

%$%C.* A

L!'size* (B

MTC'ph* B+

.-;-T* 1+00

MTC';.'ph B+0B

MOC'ph B+

L'ph (+(

"M%"'ph 1+B

%M%'ph D

subscr'per'pag',essage 9(

subscr'per'agch',essage9 1+B

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;ara,eters or Control Channel Confguration

)pecifcation >a&e "bPectF

ac,age

( >a&e ange *eaning

.NTQ5 .A> .TQ5 T.(.*(..)(.((.T.) (T)F(T) *AX5T 1; !; 4; 7 &axi&u& nu&ber o$ allo'e#retrans&issions o$ a channelre:uest on the A.

TXNG>T55 (T)F(T) >)"T)T 0; ; 1? 3; 4; ; 6;7; 8; 9; 10;11; 1!; 14;16; !0; !;3!; 0

nu&ber o$ A. slots tosprea# re-trans&ission o$channel re:uestR also fxingthe #eter&inistic part o$ 'aitti&e

()NAN(O)N5) (T)F(T) >(OA 070! $orco&b .

nu&ber o$ co&&on controlbloc,s per &ulti$ra&e use#$or access grant exclusivel

()NAN*

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0 -xten)e) Channel Mo)e

Gn a nor&al )* stan#ar# cell the &axi&u& *)-(T) #istance is 3 ,&R this is the li&it

given b the &axi&u& TA 2ti&ing a#vance 063 bit 'hich is possible on one ra#ioti&eslot

istance calculation+

&ist 9 T! *bitDperio) *lightDspee) : (

bit-perio# ? 48F13 2369Ss

light-spee#? 300000 ,&Fs

The $eature 5xten#e# ellsU supports a larger #istance bet'een *) an# (T) b usingt'o subse:uent ra#io ti&eslots to co&pensate the longer #ela o$ the bursts The frst

ti&eslot o$ a #ouble ti&eslot has al'as an even nu&ber 20;!;4;6; the $ollo'ingcorrespon#ing channel &ust not be create#

a&e "bPectFac,age

( >a&e ange *eaning

5NTQ5 (T)F(T)( 5TQ5 )T5%*(55XT5

&axi&u& range 3 ,&a cell covering other cells&axi&u& range 100 ,&

5XT5>5N*"5 .A> 5XT*"5 T%5

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-xercises

-xercise 1* Creation o .FC in %$%

The obPect in )() confguration language speci$ing a + ()-* 2co&&an# list $or chec,ing the input para&eter re:uire#

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%olutions

-xercise 1

CREATE TRX:NAME=BSC:0/bts:0/trx:0, TRXFREQ=75, PWRRED=0, RADIOMR=OFF,

RADIOMG=5!, MOEC=TR"E, TRXAREA=NONE#

the para&eter are specife# as $ollo'ing+

()+ () nu&ber to the relate# "* 0 47

bts+ (T)F5 nu&ber to the relate# () 0 119

trx+ TX nu&ber to the relate# cell 0 6

TX F ">5

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Documents

1789-02