53419667 SDCCH Dimension Ing Rough

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31cc4.c4.cc400 0

1 Area to be Covered = 35 Km^2 Area Type = Urban Total Users = 200K During BH Call Average Call Requests; ʄ1 = Average Call Duration; H1 = SMS Average SMS Requests; ʄ2 = Location Update =20% of total users

2 reqs 60 sec 5

*)"0") " * +""5 1 Y " 6 "" 6- 7) Y " #+ 5 8 ( +) Y cc49c4 (

0 1 Given That TRUNKED BLOCK CALLS CLEARED SYSTEM. (ErlangB)

11: c")" + c4 " ) ) 41 TCH ERLANGS per user during BH = 2*60/3600 E c4 ) ) 4;(

c")" + cc4 " ) ) 41 c"" ) " For Call Setup MS-T : A-MS-T= ʄ* HT-MS-T =2*2.9/3.6 =1.611mE " A2 = ʄ2*H2 =5*6/3.6 = 8.333mE c0 0$ * & If each once per user per BH. IMSI attach erlang =3.9/3.6=1.0833mE IMSI detach erlang = 2.9/3.6=0.8055mE Normal LA = 3.5/3.6 = 0.9722mE Periodic LA = 3.5/3.6 = 0.9722mE (set T3212=40 i.e. 4hrs) total=3.8332mE for 20% total population =3.8332 x 0.2 =>LU erlang =0.76664mE SDCCH Erlang = [Call setup + SMS +{ IMSI attach + IMSI dettach+ + Normal LU + Periodic Registration + False Access + Speech Quality}]*1.2 i.e. with Margin 10-20% SDCCH Erlang = Call setup + SMS+LU+20% marginSDCCH erlangs =1.611m+8.333m+.76664m+.4755m cc4 ) ) 4;<2($ %&

10 c =!"#

1 Free Space path Loss is given by; È Y

Y

YYYY Y YY Y Setting Pr(d) = -70dBm Setting fc = 0.9GHz or ʄ=1/3 Setting Pt=45dBm Setting Feeder Loss Fdrloss=30dB Setting Gt=1; (gain>1 means a Directional Antenna Characteristics of transmitter) Setting Gr=1; (gain=1 means isotropic type reception) Pt>> Feeder Loss+ FSPL>>Pr Pt-NETLOSS = Pr FSPL(db) = -(Pr-Pt+25)= -(-70-45+30)= 85 dB In other words pt͛=45-30; FSPL=85;Pr=-70dBm

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Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y

!!" #$%&'(# $%& )*)+

#

;>'?8(Y

Y

YY Y Y Y YYYYY

1- c ""@ ()(* + )(, +- ` Y YYYYYY YY Y TRX per cell 6

c49cc4 c ""91:

+- "" ;

2

$( #&

No. of Available TS per cell=

6*8 = 48 physical channels channels or Timeslots (each 33.8kbps carrying 13Kbps speech)

c")" + +c4 c ""1 ÊYYY YYY c")" + +cc4 c ""1 Y

Y

!!"#$!!"YÊ YY"Y YY !!YY"YY YY$!!"%Y

No. of SDCCH/cell=

1 using ErlangB table (for 1% blocking and .01186E; n is approx 1)

c")" + +cc4 c ""1 Y&!!#!!!YÊ%Y

No. of BCCH/cell =

1 (minimum 1 is mandatory)

No. of TCH/cell c #+ c ""1 TCH capacity per cell

=

48-(1+1)=48-2=46

=

j j

No. of Subscribers per cell = j j jjjjjj Since 120degree sectoring so one site has 3 cells or sectors No. of Subscribers per site = j j

Ê Y Y Y Y Y Ê Y Y Y Y Y Ê Y YY

Y>>>>>6>A2Y Y Y Y

Y Y YY Y

Y Y Y Y

User Density Site Coverage Area

200000/35 = 5715 35/183 = 0.573770492

= =

t

t

Since Area of Hexagon; , -./0 1

Site Radius

=

2

# 3#4

4!

5//605./ 7

This

) '?>( is in agreement with c '?( Inter Site Distance = 5//605./*2 = 939.87731

'100 0$ ""5 & NOTE:

1% SDCCH GOS & 2% TCH GOS There are 3 Cells per site.

There are 6 TRX per cell i.e. -.-.-c.-.-.-!

-c !00 1 -cc4Bc @

( "+ c ")" + ( $cc4B!cc4& &!!Y'Y Y%

( "+ cc4<)" + ( $cc4

% ( " + *)" + ( $c4<6!cc4Bcc4& Ê Y'Y Y ( ) * +%

- Timeslot #

Configuration

0

BCCH+CCCH

1

DCCH8 (SDCCH8+SACCH8)

2

TCH8/FACCH+SACCH

3

TCH8/FACCH+SACCH

4

TCH8/FACCH+SACCH

5

TCH8/FACCH+SACCH

6

TCH8/FACCH+SACCH

7

TCH8/FACCH+SACCH

Type of Multiframe BCCH+CCCH c* ")" + ( (51 Frames) SDCCH8+SACCH8 c "c* ")" + ( (51+51=102 Frames) TCH8/FACCH+SACCH *)" + ( (26 frames) TCH8/FACCH+SACCH *)" + ( (26 frames) TCH8/FACCH+SACCH *)" + ( (26 frames) TCH8/FACCH+SACCH *)" + ( (26 frames) TCH8/FACCH+SACCH *)" + ( (26 frames) TCH8/FACCH+SACCH *)" + ( (26 frames)

No. of Frames in Super Frame =51*26 =1326 =102*13 =1326 =26*51 =1326 =26*51 =1326 =26*51 =1326 =26*51 =1326 =26*51 =1326 =26*51 =1326

-!!0cc0@

* ( " + *)" + ( $c4<6!cc4Bcc4& Ê Y'Y Y ` ( ) * +%

-

Timeslot #

Configuration

0

TCH8/FACCH+SACCH

1

TCH8/FACCH+SACCH

2

TCH8/FACCH+SACCH

3

TCH8/FACCH+SACCH

4

TCH8/FACCH+SACCH

5

TCH8/FACCH+SACCH

6

TCH8/FACCH+SACCH

7

TCH8/FACCH+SACCH

Type of Multiframe TCH8/FACCH+SACCH *)" + ( (26 frames) TCH8/FACCH+SACCH *)" + ( (26 frames) TCH8/FACCH+SACCH *)" + ( (26 frames) TCH8/FACCH+SACCH *)" + ( (26 frames) TCH8/FACCH+SACCH *)" + ( (26 frames) TCH8/FACCH+SACCH *)" + ( (26 frames) TCH8/FACCH+SACCH *)" + ( (26 frames) TCH8/FACCH+SACCH *)" + ( (26 frames)


-c!!0cc0@

* ( " + *)" + ( $c4<6!cc4Bcc4& Ê Y'Y Y ` ( ) * +%

-c

Timeslot #

Configuration

0

TCH8/FACCH+SACCH

1

TCH8/FACCH+SACCH

2

TCH8/FACCH+SACCH

3

TCH8/FACCH+SACCH

4

TCH8/FACCH+SACCH

5

TCH8/FACCH+SACCH

6

TCH8/FACCH+SACCH

7

TCH8/FACCH+SACCH



-!!0cc0@

* ( " + *)" + ( $c4<6!cc4Bcc4& Ê Y'Y Y ` ( ) * +%

- Timeslot #

Configuration

0

TCH8/FACCH+SACCH

1

TCH8/FACCH+SACCH

2

TCH8/FACCH+SACCH

3

TCH8/FACCH+SACCH

4

TCH8/FACCH+SACCH

5

TCH8/FACCH+SACCH

6

TCH8/FACCH+SACCH

7

TCH8/FACCH+SACCH



-!!0cc0@

* ( " + *)" + ( $c4<6!cc4Bcc4& Ê Y'Y Y ` ( ) * +%Y Y

- Timeslot #

Configuration

0

TCH8/FACCH+SACCH

1

TCH8/FACCH+SACCH

2

TCH8/FACCH+SACCH

3

TCH8/FACCH+SACCH

4

TCH8/FACCH+SACCH

5

TCH8/FACCH+SACCH

6

TCH8/FACCH+SACCH

7

TCH8/FACCH+SACCH



-!!!0cc0@

* ( " + *)" + ( $c4<6!cc4Bcc4& Ê Y'Y Y ` ( ) * +%

-! Timeslot #

Configuration

0

TCH8/FACCH+SACCH

1

TCH8/FACCH+SACCH

2

TCH8/FACCH+SACCH

3

TCH8/FACCH+SACCH

4

TCH8/FACCH+SACCH

5

TCH8/FACCH+SACCH

6

TCH8/FACCH+SACCH

7

TCH8/FACCH+SACCH



31 (

cc400 01 7) + cc4Bccc4@

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No. of Carriers

Name of TRX

1

TRXA

+

;C-Ê

TRX CONFIG: 6TRX/cell Number of Configuration Timeslots BCCH+CCCH

$Y'Y Y%

Type of Multiframe Speech Multiframe (51 Frames)

1

c400 01 7) '2 + c4<6!cc4Bcc4<@

..'./.2.? >....'./.2.? >....'./.2.? >....'./.2.? >....'./.2.? >....'./.2.?

No. of Timeslots for TCH (n) 46

;C-Ê $Y'Y Y ( ) * +% ;C-Ê &Y'Y Y ` ( ) * +% ;C-cÊ !Y'Y Y ` ( ) * +% ;C-Ê Y'Y Y ` ( ) * +% ;C-Ê Y'Y Y ` ( ) * +% ;C-!Ê Y'Y Y ` ( ) * +%

TRX CONFIG: 6TRX/cell Number of Configuration of Time slots TCHs (nTCH) n*TCH8/FACCH+SACCH 46 = 46* TCH8/FACCH+SACCH

TCH Capacity (ETCH)

Type of Multiframe

j j

Speech Multiframe (26 Frames)

cc4 (

1 + cc4<Bcc4<

No. of Timeslots for SDCCH (n)

1

SDCCH Configuration

n*SDCCH8+SACCH8 = 1 SDCCH8+SACCH8

TRX CONFIG: 6TRX/cell SDCCH No. of capacity Number (use n and SDCCH Sub of TCHs 1% GOS in channels ErlangB (nTCH) table) (nSDCCH) (ESDCCH)

8

3.128E

46

TCH Capacity (ETCH)

36.5324E

SDCCH/TCH Ratio

3

=21.93%

38 3

Type of Multiframe

DCCH8 Control Multiframe (51+51 =102 Frames)

53419667 SDCCH Dimension Ing Rough

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