tm3g dl primary sc plan

7/27/2019 TM3G DL Primary SC Plan

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DL Primary Scrambling Code (SC)DL Primary Scrambling Code (SC)Planning Proposal for TM 3G ProjectPlanning Proposal for TM 3G Project




Agenda

• Cell Search Procedure for an UE

• DL Primary Scrambling Code Planning Guidelines

• SC Plan Strategies proposed for TM 3G network

• Conclusion




Cell Search Procedure for an UE




The purpose of the cell search procedure is to help an UE finding a suitable

cell and determining the DL scrambling code and frame synchronization of that cell.

• Step 1: Slot synchronization – During the 1st step an UE uses the SCH’sprimary synchronization code to acquire slot synchronization to a cell, andthis code is common to all cells.

• Step 2: Frame synchronization and code-group identification – Duringthe 2nd step the UE uses SCH’s secondary synchronization code to findframe synchronization and identify the code group of the cell found in the 1st

step.

• Step 3: Scrambling-code identification – During the last step the UE

determines the exact primary SC used by the cell found. The primary SC isidentified through symbol-by-symbol correlation over the P-CCPCH with allcodes within the code group identified in the 2nd step.




DL Primary Scrambling Code PlanningGuidelines




Introduction of Code Groups

Group of Primary Scrambling Codes

512 Elements

Group #0

8 Elements

Group #63

8 Elements

8192 Downlink Scrambling Codes

512 Groups with 16 Elements each

(1 primary, 15 secondary codes)

#0 primary

15 secondary

#511 primary

15 secondary

Group 1 Group 512


512 Elements

Group #0

8 Elements

Group #63

8 Elements


512 Elements

Group #0

8 Elements

Group #63

8 Elements

8192 Downlink Scrambling Codes

512 Groups with 16 Elements each

(1 primary, 15 secondary codes)

#0 primary

15 secondary

#511 primary

15 secondary

Group 1 Group 512




0 0 1 2 3 4 5 6 7

1 8 9 10 11 12 13 14 15

2 16 17 18 19 20 21 22 23

3 24 25 26 27 28 29 30 31

. . . . . . . . .. . . . . . . . .

. . . . . . . . .

. . . . . . . . .

. . . . . . . . .

63 504 505 506 507 508 509 510 511

Code Group No.

(0,1,….,63)Total 64 codeGroups

• 512 (0…511) DL primary SC are subdivided into 64 (0…63) code groups

each of 8 codes.

• Each cell has to be assigned by 1 particular scrambling code.

• 2 cells for a same sector but with different carriers can have the same SC.

• Code Planning in WCDMA resembles frequency planning (BCCH, TCH)

in GSM.




DL primary SC Planning Guidelines

1. Random Code Planning – Randomly allocate the codes from any codegroups to the cells. A planner must be aware of the distance (coverage)between 2 cells using the same SC while utilizing this method.

2. Reuse Code Group Planning – Divide 64 code groups into several setsbased on the scale of a network (Hierarchical Cell Structure) and purposeof future expansion plan.

??Reuse Code Group Plann ing is proposed for the TM 3G network




Reuse Code Group Planning

0,10,3

0,40,6

0,0 0,50,2

2,11,3

2,42,6

2,0 2,52,2

1,11,3

1,41,6

1,0 1,5

1,2UEUE

Code group

Code code

1,03,0

4,06,0

0,0 5,02,0

16,014,0

20,019,0

15,0 18,017,0

12,011,0

13,08,0

10,0 7,0

9,0

UEUE

• There is a tradeoff between minimum number of codes per group & minimum

number of groups which both result in different time for Cell Search Procedure

during step 2 and 3.

• For the 1st allocation, the required time is short in step 2 but longer in step 3.

• For the 2nd allocation, the required time is long in step 2 but shorter in step 3.

??2 nd allocation is proposed for the TM 3G network.

1st allocation

(reuse of 3 code groups)

2nd allocation

(reuse of 21 code groups)




SC Plan Strategies Proposed for TM 3GNetwork




Two Scenarios for SC Plan1. With Future Expansion Plan (mainly based on defined clusters)

• 64 Code Groups are divided into 3 sets.

• Set A: 19 groups reserved for future expansion which can support

19 x 8codes = 152 codes = 152 cells = 51 sites for 1 reuse

• Set B: 36 groups for Macro layer outdoor sites which can support


• Set C: 9 groups for In-building, Micro and testing cells which can support9 x 8codes = 72 codes = 72 cells = 24 sites for 1 reuse

• Advantage: The SC plan is very flexible with 19 groups reserved for future

expansion and it’s highly recommended for TM3G network.

• Disadvantage: The reuse pattern is a little tight for this scenario.

0 .. 18 19 .. 54 55 .. 63

36 919

SC Group

Set A Set B Set C




Two Scenarios for SC Plan

2. Without Future Expansion Plan (mainly based on defined areas)

• 64 Code Groups are divided into 2 sets.

• Set A: 52 groups Macro layer outdoor sites which can support


• Set B: 12 groups for In-building, Micro and testing cells which can support


• Disadvantage: The SC plan for future expansion would be difficult without

reserving some groups in advance.

• Advantage: The reuse pattern is loose for this scenario.

0 .. .. .. .. 51 52 .. 63

12

SC Group

Set BSet A

52




Outdoor sites SC Plan With Future Expansion - 1

• Planning Strategies:

1. Reuse patterns allocation based on the defined clusters.

2. One reuse pattern can support 12 sites (36 groups) which means2 reuse patterns in average are allocated for one particular cluster.

(Because each cluster has around 20 sites in average, 2 reuse patterns

together will have a margin of 4 sites for further added sites or cells.)

3. Deploy 8 reuse patterns.

4. Avoid allocating 2 same code groups too close and a separation of 2

patterns is a safe margin.




Outdoor sites SC Plan With Future Expansion - 219 152 153 154 155 156 157 158 159 a

20 160 161 162 163 164 165 166 167 b

21 168 169 170 171 172 173 174 175 c

22 176 177 178 179 180 181 182 183 a

23 184 185 186 187 188 189 190 191 b24 192 193 194 195 196 197 198 199 c

25 200 201 202 203 204 205 206 207 a

26 208 209 210 211 212 213 214 215 b

27 216 217 218 219 220 221 222 223 c

28 224 225 226 227 228 229 230 231 a

29 232 233 234 235 236 237 238 239 b

30 240 241 242 243 244 245 246 247 c

31 248 249 250 251 252 253 254 255 a

32 256 257 258 259 260 261 262 263 b

33 264 265 266 267 268 269 270 271 c

34 272 273 274 275 276 277 278 279 a

35 280 281 282 283 284 285 286 287 b

36 288 289 290 291 292 293 294 295 c

37 296 297 298 299 300 301 302 303 a

38 304 305 306 307 308 309 310 311 b

39 312 313 314 315 316 317 318 319 c

40 320 321 322 323 324 325 326 327 a

41 328 329 330 331 332 333 334 335 b

42 336 337 338 339 340 341 342 343 c

43 344 345 346 347 348 349 350 351 a

44 352 353 354 355 356 357 358 359 b

45 360 361 362 363 364 365 366 367 c

46 368 369 370 371 372 373 374 375 a

47 376 377 378 379 380 381 382 383 b

48 384 385 386 387 388 389 390 391 c

49 392 393 394 395 396 397 398 399 a

50 400 401 402 403 404 405 406 407 b

51 408 409 410 411 412 413 414 415 c

52 416 417 418 419 420 421 422 423 a

53 424 425 426 427 428 429 430 431 b

54 432 433 434 435 436 437 438 439 c

Set B

36 Code Groupswith 8 reuse patterns,i.e. “1” reuse patterncan support:

36 / 3 = 12 sites

8 Reuse Patterns




Outdoor sites SC Plan With Future Expansion - 30 1 2 3 4 5 6 7

19 152 153 154 155 156 157 158 159

20 160 161 162 163 164 165 166 167

21 168 169 170 171 172 173 174 175

22 176 177 178 179 180 181 182 183

23 184 185 186 187 188 189 190 191

24 192 193 194 195 196 197 198 199

25 200 201 202 203 204 205 206 207

26 208 209 210 211 212 213 214 215

27 216 217 218 219 220 221 222 223

28 224 225 226 227 228 229 230 231

29 232 233 234 235 236 237 238 239

30 240 241 242 243 244 245 246 247

31 248 249 250 251 252 253 254 255

32 256 257 258 259 260 261 262 263

33 264 265 266 267 268 269 270 27134 272 273 274 275 276 277 278 279

35 280 281 282 283 284 285 286 287

36 288 289 290 291 292 293 294 295

37 296 297 298 299 300 301 302 303

38 304 305 306 307 308 309 310 311

39 312 313 314 315 316 317 318 319

40 320 321 322 323 324 325 326 327

41 328 329 330 331 332 333 334 335

42 336 337 338 339 340 341 342 343

43 344 345 346 347 348 349 350 351

44 352 353 354 355 356 357 358 359

45360 361 362 363 364 365 366 367

46 368 369 370 371 372 373 374 375

47 376 377 378 379 380 381 382 383

48 384 385 386 387 388 389 390 391

49 392 393 394 395 396 397 398 399

50 400 401 402 403 404 405 406 407

51 408 409 410 411 412 413 414 415

52 416 417 418 419 420 421 422 423

53 424 425 426 427 428 429 430 431

54 432 433 434 435 436 437 438 439

• For the convenience of mappingthe 8 reuse patterns onto the

network, 8 different colours are

assigned to each reuse pattern.

R1

R2

R3

R4

R5

R6

R7

R8




Outdoor sites SC Plan With Future Expansion - 4

Pattern Color Times of

Usage

R1 5

R2 5

R3 5

R4 5

R5 5

R6 5

R7 5

R8 6

• The average reuseSC pattern for thisphase is 5 as shown inthe snapshot and table.Besides, each pattern’stimes of usage is

almost the same as 5which refers everypattern has been fullyutilized.




Outdoor sites SC Plan With Future Expansion - 5This picture is the example of the reuse distance. It’s obvious that the separation with 2 or 3patterns located in between.




Outdoor sites SC Plan Without Future Expansion - 1

• Planning Strategies:

1. Reuse patterns allocation based on the defined areas.

2. One reuse pattern can support 17 sites (52 groups) which meansroughly 5 reuse patterns in average are allocated for one particular area.

3. Deploy 8 reuse patterns.

4. Avoid allocating 2 same code groups too close and a separation of 2

patterns is a safe margin.





52 Code Groupswith 8 reuse patterns,

i.e. “1” reuse patterncan support:

52 / 3 = 17 sites

8 Reuse Patterns

0 0 1 2 3 4 5 6 7

1 8 9 10 11 12 13 14 15 a

2 16 17 18 19 20 21 22 23 b

3 24 25 26 27 28 29 30 31 c

4 32 33 34 35 36 37 38 39 a

5 40 41 42 43 44 45 46 47 b

6 48 49 50 51 52 53 54 55 c

7 56 57 58 59 60 61 62 63 a8 64 65 66 67 68 69 70 71 b

9 72 73 74 75 76 77 78 79 c

10 80 81 82 83 84 85 86 87 a

11 88 89 90 91 92 93 94 95 b

12 96 97 98 99 100 101 102 103 c

13 104 105 106 107 108 109 110 111 a

14 112 113 114 115 116 117 118 119 b

15 120 121 122 123 124 125 126 127 c

16 128 129 130 131 132 133 134 135 a

17 136 137 138 139 140 141 142 143 b

18 144 145 146 147 148 149 150 151 c

19 152 153 154 155 156 157 158 159 a

20 160 161 162 163 164 165 166 167 b

21 168 169 170 171 172 173 174 175 c

22 176 177 178 179 180 181 182 183 a

23 184 185 186 187 188 189 190 191 b

24 192 193 194 195 196 197 198 199 c

25 200 201 202 203 204 205 206 207 a

26 208 209 210 211 212 213 214 215 b

27 216 217 218 219 220 221 222 223 c

28 224 225 226 227 228 229 230 231 a

29 232 233 234 235 236 237 238 239 b

30 240 241 242 243 244 245 246 247 c

31 248 249 250 251 252 253 254 255 a

32 256 257 258 259 260 261 262 263 b

33 264 265 266 267 268 269 270 271 c

34 272 273 274 275 276 277 278 279 a

35 280 281 282 283 284 285 286 287 b

36 288 289 290 291 292 293 294 295 c

37 296 297 298 299 300 301 302 303 a

38 304 305 306 307 308 309 310 311 b

39 312 313 314 315 316 317 318 319 c

40 320 321 322 323 324 325 326 327 a

41 328 329 330 331 332 333 334 335 b

42 336 337 338 339 340 341 342 343 c

43 344 345 346 347 348 349 350 351 a

44 352 353 354 355 356 357 358 359 b

45 360 361 362 363 364 365 366 367 c

46 368 369 370 371 372 373 374 375 a

47 376 377 378 379 380 381 382 383 b

48 384 385 386 387 388 389 390 391 c

49 392 393 394 395 396 397 398 399 a

50 400 401 402 403 404 405 406 407 b

51 408 409 410 411 412 413 414 415 c

Set A





• For the convenience of mappingthe 8 reuse patterns onto the

netowrk, 8 different colours are

assigned to each reuse pattern.

R1

R2

R3

R4

R5

R6

R7

R8

0 1 2 3 4 5 6 7

1 8 9 10 11 12 13 14 15

2 16 17 18 19 20 21 22 23

3 24 25 26 27 28 29 30 31

4 32 33 34 35 36 37 38 39

5 40 41 42 43 44 45 46 47

6 48 49 50 51 52 53 54 55

7 56 57 58 59 60 61 62 63

8 64 65 66 67 68 69 70 71

9 72 73 74 75 76 77 78 79

10 80 81 82 83 84 85 86 87

11 88 89 90 91 92 93 94 95

12 96 97 98 99 100 101 102 103

13 104 105 106 107 108 109 110 111

14 112 113 114 115 116 117 118 119

15 120 121 122 123 124 125 126 127

16 128 129 130 131 132 133 134 135

17 136 137 138 139 140 141 142 143

18 144 145 146 147 148 149 150 151

19 152 153 154 155 156 157 158 159

20 160 161 162 163 164 165 166 167

21 168 169 170 171 172 173 174 175

22 176 177 178 179 180 181 182 183

23 184 185 186 187 188 189 190 191

24 192 193 194 195 196 197 198 199

25 200 201 202 203 204 205 206 207

26 208 209 210 211 212 213 214 215

27 216 217 218 219 220 221 222 223

28 224 225 226 227 228 229 230 231

29 232 233 234 235 236 237 238 239

30 240 241 242 243 244 245 246 247

31 248 249 250 251 252 253 254 255

32 256 257 258 259 260 261 262 263

33 264 265 266 267 268 269 270 271

34 272 273 274 275 276 277 278 279

35 280 281 282 283 284 285 286 287

36 288 289 290 291 292 293 294 295

37 296 297 298 299 300 301 302 303

38 304 305 306 307 308 309 310 311

39 312 313 314 315 316 317 318 319

40 320 321 322 323 324 325 326 327

41 328 329 330 331 332 333 334 335

42 336 337 338 339 340 341 342 343

43 344 345 346 347 348 349 350 351

44 352 353 354 355 356 357 358 359

45 360 361 362 363 364 365 366 367

46 368 369 370 371 372 373 374 375

47 376 377 378 379 380 381 382 383

48 384 385 386 387 388 389 390 391

49 392 393 394 395 396 397 398 399

50 400 401 402 403 404 405 406 407

51 408 409 410 411 412 413 414 415





Pattern Color Times of Usage

R1 4

R2 4

R3 3

R4 4

R5 3

R6 4

R7 3

R8 3

• The average reuseSC pattern for thisphase is 4 as shown inthe snapshot and table.Besides, each pattern’stimes of usage is

almost the same as 4which refers everypattern has been fullyutilized.




Outdoor sites SC Plan With Future Expansion - 5This picture is the example of the reuse distance. It’s obvious that the separation with 2 or 3patterns located in between.




• The DL primary scrambling code plan for In-Building sites is just the sameas the plan for outdoor sites.

• The SC plan carried out for phase 1 can be also used in other regions of

Malaysia for future phases without any conflicts.

• Of course SC plan with future expansion is strongly recommedned for its

character of flexibility.

• The attachment is the Master Site Database with planned SC.

Conclusion

Master Table




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tm3g dl primary sc plan

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