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S cra mb li ng Cod e Plannin g Guidelines
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Scrambling CodePlanning Guidelines
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Scrambling Code Planning Guidelines
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In reuse of the same scrambling code, the reuse base stations should beadequately spaced in geological distance.
Reuse distance of typical raido environment are recommended as below:
Table 1 Analysis of Same-scrambling Code Reuse
Area Code reuse distance（km） NodeB radius（km）
Dense urban 4 0.3～0.6
Common urban 7.4 0.6～1.2
suburb 17 1.2～3
rural 73 5～10
2.2 PSC Planning Principles
Downlink code planning is the process to allocate 512 sets of primary codes todifferent sectors which shall conform to the following principles:
2.2.1 PSC reserve for expansion and indoor site
The characteristic of network construction by steps should be taken intoconsideration for scrambling code planning, with a certain number of scramblingcodes reserved for network expansion and indoor distribution system. Whenanalyzing the maximum number of scrambling codes used in each area, the
number is calculated by the minimum radius of the macro cellular base stationsin the specific area. The number of scrambling codes actually allocated shouldbe assigned depending on the number of macro cellular base stations in theplanned area. The unused scrambling codes can be reserved for subsequentexpansion. For micro-cell and indoor distribution system, which the basestations are well spaced, particularly those in the indoor distribution system, thescrambling codes are reused at a high rate, so 40 scrambling codes should bereserved.
2.2.2 PSC reserve for boundary site
A number of scrambling codes should be reserved for coordination of boundarybase stations. Generally, a big WCDMA network is divided into multiple subnetsplanned by different planners. It is highly likely that the base station at theborder of two subnets is allocated with the same scrambling code due to thelack of knowledge of the scrambling code allocation plans for other subnets, andthe interference may be caused as the distance between the same-scramblingcode base stations fails to meet the scrambling code reuse distancerequirement. To avoid such case, planners should reach a consensus on thenumber of scrambling codes reserved for coordination by boundary basestations. The number of reserved scrambling codes should be confined withinthe distributable number in a cluster (see Table 1), but the number of scramblingcodes in application can be smaller than the stipulated one.
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3 PSC planning proposal
For PSC planning, ZTE propose to use 9~50 PSC group, totally 336 PSC for current out door site, group 1~8 is reserved for network expansion, group 51~59is reserved for boundary site and group 60~64 is reserved for indoor site.moredetails please refer to table 2 and table 3
Table 2 Recommended Scrambling Code Allocation Plan-1
Allocation of
Scrambling Codes
for network
expansion
Common
Scrambling
Code Allocation
Allocation of
Scrambling Codes
for Boundary site
Allocation of
Scrambling Codes
for Indoor site
Recommende
d value
0~63 64~399 400~471 472~511
Table 3 Recommended Scrambling Code Allocation Plan-2
PSC
groupPSC Purpose
1 0 1 2 3 4 5 6 7
used fornetwork
expansion
2 8 9 10 11 12 13 14 15
3 16 17 18 19 20 21 22 23
4 24 25 26 27 28 29 30 31
5 32 33 34 35 36 37 38 39
6 40 41 42 43 44 45 46 47
7 48 49 50 51 52 53 54 55
8 56 57 58 59 60 61 62 63
9 64 65 66 67 68 69 70 71
Used for
outdoor
site
10 72 73 74 75 76 77 78 79
11 80 81 82 83 84 85 86 87
12 88 89 90 91 92 93 94 95
13 96 97 98 99 100 101 102 103
14 104 105 106 107 108 109 110 111
15 112 113 114 115 116 117 118 119
16 120 121 122 123 124 125 126 127
17 128 129 130 131 132 133 134 135
18 136 137 138 139 140 141 142 143
19 144 145 146 147 148 149 150 151
20 152 153 154 155 156 157 158 159
21 160 161 162 163 164 165 166 167
22 168 169 170 171 172 173 174 175
23 176 177 178 179 180 181 182 183
24 184 185 186 187 188 189 190 191
25 192 193 194 195 196 197 198 199
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26 200 201 202 203 204 205 206 207
27 208 209 210 211 212 213 214 215
28 216 217 218 219 220 221 222 223
29 224 225 226 227 228 229 230 231
30 232 233 234 235 236 237 238 239
31 240 241 242 243 244 245 246 24732 248 249 250 251 252 253 254 255
33 256 257 258 259 260 261 262 263
34 264 265 266 267 268 269 270 271
35 272 273 274 275 276 277 278 279
36 280 281 282 283 284 285 286 287
37 288 289 290 291 292 293 294 295
38 296 297 298 299 300 301 302 303
39 304 305 306 307 308 309 310 311
40 312 313 314 315 316 317 318 319
41 320 321 322 323 324 325 326 327
42 328 329 330 331 332 333 334 335
43 336 337 338 339 340 341 342 343
44 344 345 346 347 348 349 350 351
45 352 353 354 355 356 357 358 359
46 360 361 362 363 364 365 366 367
47 368 369 370 371 372 373 374 375
48 376 377 378 379 380 381 382 383
49 384 385 386 387 388 389 390 391
50 392 393 394 395 396 397 398 399
51 400 401 402 403 404 405 406 407
used for
boundary
site
52 408 409 410 411 412 413 414 415
53 416 417 418 419 420 421 422 423
54 424 425 426 427 428 429 430 431
55 432 433 434 435 436 437 438 439
56 440 441 442 443 444 445 446 447
57 448 449 450 451 452 453 454 455
58 456 457 458 459 460 461 462 463
59 464 465 466 467 468 469 470 471
60 472 473 474 475 476 477 478 479
used for
indoor
site
61 480 481 482 483 484 485 486 487
62 488 489 490 491 492 493 494 495
63 496 497 498 499 500 501 502 503
64 504 505 506 507 508 509 510 511
