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Cellular Network Planning

TEKNIK TELEKOMUNIKASI DAN INFORMASI

JURUSAN TEKNIK ELEKTRO FAKULTAS TEKNIK

UNIVERSITAS HASANUDDIN

2011

ASHADI AMIR

D41108264

TOPIK KHUSUS WIRELESS

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Service Area Parateres and Offered Traffic

RegionArea A

(km2 )

lock Size

LB (km)

Car Spacing

Sv (km)

Pedestrian

Spacing

Sp (km)

Traffic

Vehicular

Traffic

Pedestrian

A 3,594 0,1 0,0054 0,0045 45,25 51,12

B 12,3066 0,28 0,028 0,0154 10,67 18,27

C 4,732 0,16 0,0122 0,0109 16,48 17,36

D 4,368 0,15 0,0115 0,0100 17,2 18,63

Service probability for vehicular esers must be 85% = 0,85

Service probability for vehicular esers must be 80% = 0,80

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Network penetration 10% = 0,1

Traffic generated by each users during the busy hour 40 mErl = 0,04 Erl

This system using FDMA / TDMA and the maximum number of channel in one cell is 28

STEP 1

Prediction of the Offered Traffic

For vehicle users:

For pedestrian users

Calculated the offered traffic

Region A

For vehicle users:

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For pedestrian users

Region B

For vehicle users:

For pedestrian users

Region C

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For vehicle users:

For pedestrian users

Region D

For vehicle users:

For pedestrian users

STEP 2

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Determined the cell sites and number of traffic channels assigned to each BSs

For 2% blocking probability according to Erlang B table with 7,14,21,28 traffic

channels, we can find the offered traffic in each region and calculate the minimum

number of cells that are required

Traffic channels / BS 8 16 24 32

Maximum traffic / BS 3,62 9,82 16,63 23,72

RegionOffered

Traffic

A 96,37 26,62 9,81 5,79 4,06

B 28,94 7,99 2,95 1,74 1,22

C 33,84 9,34 3,44 2,03 1,42

D 35,83 9,89 3,64 2,15 1,51

Tabel offered traffic given by vehicular & pedestrian traffic

STEP 3

In this approach, each region devided into some small regions by determined the size

of the largest cell that given by:

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Region A

Region A the minimum number of cells is 5 (>4,06) but in practice 8 rectangular cells

must be used. The size of the largest cells A1, A2, dan A3 is

The cell area and the corresponding offered traffic in cells A1, A2 dan A3 are

( )

( )

AA1 A2 A4

A5 A6 A7 A8

A3

0,94 0,94 0,94 0,36

0,94

0,19

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( )

( )

Theoritically, we need 5 BS to serve this area. But in practical, minimum number seems

to be 8 rectangular cells (8 base stations). They are A1, A2, A3, A4, A5, A6, A7 and A8

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Region B

Region B (>1,22) the minimum of cell is 2(1,47)

(

)

(

)

B

B1

B2

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Region C

Region C (>1,11) the minimum of cell is 2 (>1,11)

(

)

(

)

Region D

Region C (>1,51) the minimum of cell is 2 (>1,51)

CC1

C2

1,82

1,82

0,78

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(

)

(

)

(

)

(

)

D

D1

D2

D3

D4

1,7 0,12

1,7

0,7

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STEP 4

Calculate the implemented capacity

Region A

- By using minimum excess capacity approach, capacity of the network should be:

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Region B

- By using minimum excess capacity approach, capacity of the network should be:

Region C

- By using minimum excess capacity approach, capacity of the network should be:

Region D

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- By using minimum excess capacity approach, capacity of the network should be:

Preliminary cell plan, minimum excess capacity

Region T A 96,37 8 (3x32)+(4x16)+(1x8)=168 (3x32)+16+(3x10)+6=148 114,06 (98,507)

B 28,94 2 32+16=48 32+11= 43 33,54 (29,65)

C 33,84 2 32+24=56 32+17= 49 40,35 (34,37)

D 35,83 4 24+16+(2x8)=56 21+11+5+4=41 33,69 (21,76)

TOTAL 194,98 16 328 281 221,64 (184,287)