AN2254, Scrambling Code Generation for WCDMA on the StarCore ...
WCDMA Scrambling Code
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Transcript of WCDMA Scrambling Code
Huawei Confidential. All Rights Reserved
WCDMA Primary Scrambling Codes Planning
ISSUE 1.0
2 Internal Use
ObjectiveObjective
Upon completion this course, you will be able Upon completion this course, you will be able to:to:
Understand the principles for cell primary
scrambling codes planning in WCDMA
network
Understand how to plan the cell primary
scrambling codes (PSC)
3 Internal Use
Chapter 1 Chapter 1 WCDMA PSCsWCDMA PSCs
Chapter 2 WCDMA PSC planning principleChapter 2 WCDMA PSC planning principle
Chapter 3 WCDMA PSC planning methodChapter 3 WCDMA PSC planning method
Chapter 4 WCDMA PSC planning caseChapter 4 WCDMA PSC planning case
4 Internal Use
Scrambling codes introduction GOLD sequence. 10ms ,or 38400 chips
Uplink scrambling codes The codes which are used for scrambling the uplink physical channels
can be either long or short type. 224 long and 224 short uplink scrambling codes. Uplink scrambling codes are assigned by higher layers. Because uplink scrambling codes with a great number are
allocated by RNC, we do not give our attention for that Uplink scrambling codes are used to distinguish different UEs
WCDMA Scrambling CodesWCDMA Scrambling Codes WCDMA Scrambling CodesWCDMA Scrambling Codes
5 Internal Use
Downlink scrambling codes
For downlink physical channels, a total of 218-1 = 262,143 scrambling codes can be generated.
Only scrambling codes k = 0, 1, …, 8191 are used. 8192 codes are divided into 512 groups, each of which contains 16 scr
ambling codes. The first scrambling code of each group is called primary scrambling co
de (PSC), and the other 15 ones are secondary scrambling codes (SSC).
The 512 PSCs are also divided into 64 groups, each of which contains 8 PSCs.
Downlink PSC is used to distinguish the different cells. It has to be considered carefully
WCDMA Scrambling CodesWCDMA Scrambling Codes WCDMA Scrambling CodesWCDMA Scrambling Codes
6 Internal Use
Scrambling codes for downlink physical channels
Set 0
Set 1
…
Set 511
Primary scrambling code 0
……
Secondary scrambling code 1
Secondary scrambling code
15
Primary scrambling code
511×16
……
Secondary scrambling code 511×16
+ 15
8192 scrambling codes 512 sets
A primary scrambling code and 15 secondary scrambling codes are included in a set.
Downlink Scrambling CodesDownlink Scrambling Codes Downlink Scrambling CodesDownlink Scrambling Codes
7 Internal Use
Group 0
Group 1
…
Group 63
512 primary scrambling codes
64 primary scrambling code groups
Each group consists of 8 primary scrambling codes
Downlink Primary Scrambling Code GroupsDownlink Primary Scrambling Code GroupsDownlink Primary Scrambling Code GroupsDownlink Primary Scrambling Code Groups
Primary scrambling codes for downlink physical channels
Primary scrambling code 0
……
Primary scrambling code 1
Primary scrambling code 7
Primary scrambling code
8*63
……
Primary scrambling code 63*8 + 7
8 Internal Use
Downlink Primary Scrambling CodesDownlink Primary Scrambling Codes
主扰码/ 组 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
PSC_10 128 256 384 512 640 768 896
1024
1152 1280 1408
1536 1664
1792 1920
PSC_216 144 272 400 528 656 784 912
1040
1168 1296 1424
1552 1680
1808 1936
PSC_332 160 288 416 544 672 800 928
1056
1184 1312 1440
1568 1696
1824 1952
PSC_448 176 304 432 560 688 816 944
1072
1200 1328 1456
1584 1712
1840 1968
PSC_564 192 320 448 576 704 832 960
1088
1216 1344 1472
1600 1728
1856 1984
PSC_680 208 336 464 592 720 848 976
1104
1232 1360 1488
1616 1744
1872 2000
PSC_796 224 352 480 608 736 864 992
1120
1248 1376 1504
1632 1760
1888 2016
PSC_8112 240 368 496 624 752 880
1008
1136
1264 1392 1520
1648 1776
1904 2032
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
2048 2176 2304 2432 2560 2688 2816 2944 3072 3200 3328 3456 3584 3712 3840396
8
2064 2192 2320 2448 2576 2704 2832 2960 3088 3216 3344 3472 3600 3728 3856398
4
2080 2208 2336 2464 2592 2720 2848 2976 3104 3232 3360 3488 3616 3744 3872400
0
2096 2224 2352 2480 2608 2736 2864 2992 3120 3248 3376 3504 3632 3760 3888401
6
2112 2240 2368 2496 2624 2752 2880 3008 3136 3264 3392 3520 3648 3776 3904403
2
2128 2256 2384 2512 2640 2768 2896 3024 3152 3280 3408 3536 3664 3792 3920404
8
2144 2272 2400 2528 2656 2784 2912 3040 3168 3296 3424 3552 3680 3808 3936406
4
2160 2288 2416 2544 2672 2800 2928 3056 3184 3312 3440 3568 3696 3824 3952408
0
9 Internal Use
Downlink Primary Scrambling CodesDownlink Primary Scrambling Codes
32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
4096 4224 4352 4480 4608 4736 4864 4992 5120 5248 5376 5504 5632 5760 5888 6016
4112 4240 4368 4496 4624 4752 4880 5008 5136 5264 5392 5520 5648 5776 5904 6032
4128 4256 4384 4512 4640 4768 4896 5024 5152 5280 5408 5536 5664 5792 5920 6048
4144 4272 4400 4528 4656 4784 4912 5040 5168 5296 5424 5552 5680 5808 5936 6064
4160 4288 4416 4544 4672 4800 4928 5056 5184 5312 5440 5568 5696 5824 5952 6080
4176 4304 4432 4560 4688 4816 4944 5072 5200 5328 5456 5584 5712 5840 5968 6096
4192 4320 4448 4576 4704 4832 4960 5088 5216 5344 5472 5600 5728 5856 5984 6112
4208 4336 4464 4592 4720 4848 4976 5104 5232 5360 5488 5616 5744 5872 6000 6128
48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
6144 6272 6400 6528 6656 6784 6912 7040716
8 7296 7424 7552 7680 7808 7936 8064
6160 6288 6416 6544 6672 6800 6928 7056718
4 7312 7440 7568 7696 7824 7952 8080
6176 6304 6432 6560 6688 6816 6944 7072720
0 7328 7456 7584 7712 7840 7968 8096
6192 6320 6448 6576 6704 6832 6960 7088721
6 7344 7472 7600 7728 7856 7984 8112
6208 6336 6464 6592 6720 6848 6976 7104723
2 7360 7488 7616 7744 7872 8000 8128
6224 6352 6480 6608 6736 6864 6992 7120724
8 7376 7504 7632 7760 7888 8016 8144
6240 6368 6496 6624 6752 6880 7008 7136726
4 7392 7520 7648 7776 7904 8032 8160
6256 6384 6512 6640 6768 6896 7024 7152728
0 7408 7536 7664 7792 7920 8048 8176
10 Internal Use
Chapter 1 WCDMA PSCs
Chapter 2 WCDMA PSC planning principle
Chapter 3 WCDMA PSC planning method
Chapter 4 WCDMA PSC planning case
11 Internal Use
Principle :
The intra-frequency other cells can not use the same PSC as the primary cell because of the interference!
Which cells are included in the intra-frequency other cells?
- Adjacent cell
- Neighboring cell
WCDMA PSCs planning principleWCDMA PSCs planning principle
12 Internal Use
WCDMA PSCs planning principleWCDMA PSCs planning principle
What is adjacent cell ? The adjacent cells can interfere with the primary cell
What is neighboring cell ?
Adjacent cells of a primary cell already include neighboring cells.
In terms of primary cell, it can receive pilot signals from other intra-frequency cells at the border of the cell.
These pilot signals may be stronger or weaker than that of UE access level.
If the pilot signal at the border of the primary cell is stronger than that of UE access level, this cell is (or probably is) the neighboring cell of the primary cell.
13 Internal Use
WCDMA PSCs planning principleWCDMA PSCs planning principle
What is non neighboring cell ?
These cells without interference to the primary cell are regarded as non neighboring cells, which can use the same PSCs as this primary cell
14 Internal Use
Chapter 1 WCDMA PSCs
Chapter 2 WCDMA PSC planning principle
Chapter 3 WCDMA PSC planning method
Chapter 4 WCDMA PSC planning case
15 Internal Use
WCDMA PSC planning methodWCDMA PSC planning method
The cell PSCs can be planned by either of the following two methods:
Primary cell uses different PSCs from the neighboring cells, with the PSCs of the primary cell and those of the neighboring cells belonging to the same scrambling code group.
Primary cell uses different PSCs from the neighboring cells, with the PSCs of the primary cell and those of the neighboring cells belonging to different scrambling code groups.
NOW THE LATTER IS RECOMMANDED
16 Internal Use
Chapter 1 WCDMA PSCs
Chapter 2 WCDMA PSC planning principle
Chapter 3 WCDMA PSC planning method
Chapter 4 WCDMA PSC planning case
17 Internal Use
In general, one site can support 3 intra-cells in actual network. So one PSCs group can be divided into (8 PSCs every group) 2 subgroups (4 PSCs every subgroup)
512 PSCs can be divide into 128 subgroups. The first PSC that stands for the subgroup should take part in the site PSC planning, the other PSCs of the subgroup are allocated to the cells of this site.
We must keep reserve some PSCs for future network planning.
WCDMA PSC planning caseWCDMA PSC planning caseWCDMA PSC planning caseWCDMA PSC planning case
18 Internal Use
WCDMA PSC planning caseWCDMA PSC planning case
19 Internal Use
WCDMA PSC planning caseWCDMA PSC planning case
20 Internal Use
WCDMA PSC planning caseWCDMA PSC planning case
21 Internal Use
WCDMA PSC planning case
For Example:
PSC #0 is allocated site A. So PSC #1, #2 & #3 can be allocated for other cells in site A .
If site X has three cells, then allocate three PSC 0,1,2 to the three cells. PSC #3 can be used for new cell added in future.
We recommend to use the remained PSC when add a new cell .
22 Internal Use