Huawei WCDMA Primary Scrambling Code Planning

7/16/2019 Huawei WCDMA Primary Scrambling Code Planning

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Huawei Confidential. All Rights Reserved

WCDMA Primary Scrambling Codes

PlanningISSUE 1.0


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Object

Upon completion this course, you will be able to:

Understand the principles for cell primary

scrambling codes planning in WCDMA

network

Understand how to plan the cell primary

scrambling codes (PSC)


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Chap ter 1 WCDMA PSCs

Chapter 2 WCDMA PSC palnning prinpicle

Chapter 3 WCDMA PSC palnning method

Chapter 4 WCDMA PSC planning case


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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 Codes


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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

scrambling codes.

The first scrambling code of each group is called primary scrambling

code (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 Codes


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Scrambling

codes for

downlink

physical

channels

Set 0

Set 1

Set 511

Primaryscrambling code 0

Secondary

scrambling code 1

Secondaryscrambling code

15

Primaryscrambling code

51116

Secondaryscrambling code

51116158192

scrambling

codes512 sets

A primary scrambling code and 15 secondary scrambling codes are included in a set.

Downlink Scrambling Codes


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Group 0

Groupe1

Group 63

512 primary

scrambling codes

64 primary scrambling

code groupsEach group consists of 8

primary scrambling codes

Downlink Primary Scrambling Code Groups

Primary

scramblingcodes for

downlink

physical

channels





8*63


63*87


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Downlink Primary Scrambling Codes

/ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

PSC_1 0 128 256 384 512 640 768 896 1024 1152 1280 1408 1536 1664 1792 1920PSC_2 16 144 272 400 528 656 784 912 1040 1168 1296 1424 1552 1680 1808 1936PSC_3 32 160 288 416 544 672 800 928 1056 1184 1312 1440 1568 1696 1824 1952PSC_4 48 176 304 432 560 688 816 944 1072 1200 1328 1456 1584 1712 1840 1968PSC_5 64 192 320 448 576 704 832 960 1088 1216 1344 1472 1600 1728 1856 1984PSC_6 80 208 336 464 592 720 848 976 1104 1232 1360 1488 1616 1744 1872 2000PSC_7 96 224 352 480 608 736 864 992 1120 1248 1376 1504 1632 1760 1888 2016PSC_8 112 240 368 496 624 752 880 1008 1136 1264 1392 1520 1648 1776 1904 2032

16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 312048 2176 2304 2432 2560 2688 2816 2944 3072 3200 3328 3456 3584 3712 3840 39682064 2192 2320 2448 2576 2704 2832 2960 3088 3216 3344 3472 3600 3728 3856 39842080 2208 2336 2464 2592 2720 2848 2976 3104 3232 3360 3488 3616 3744 3872 40002096 2224 2352 2480 2608 2736 2864 2992 3120 3248 3376 3504 3632 3760 3888 40162112 2240 2368 2496 2624 2752 2880 3008 3136 3264 3392 3520 3648 3776 3904 40322128 2256 2384 2512 2640 2768 2896 3024 3152 3280 3408 3536 3664 3792 3920 40482144 2272 2400 2528 2656 2784 2912 3040 3168 3296 3424 3552 3680 3808 3936 40642160 2288 2416 2544 2672 2800 2928 3056 3184 3312 3440 3568 3696 3824 3952 4080


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Downlink Primary Scrambling Codes

32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 474096 4224 4352 4480 4608 4736 4864 4992 5120 5248 5376 5504 5632 5760 5888 60164112 4240 4368 4496 4624 4752 4880 5008 5136 5264 5392 5520 5648 5776 5904 60324128 4256 4384 4512 4640 4768 4896 5024 5152 5280 5408 5536 5664 5792 5920 60484144 4272 4400 4528 4656 4784 4912 5040 5168 5296 5424 5552 5680 5808 5936 60644160 4288 4416 4544 4672 4800 4928 5056 5184 5312 5440 5568 5696 5824 5952 60804176 4304 4432 4560 4688 4816 4944 5072 5200 5328 5456 5584 5712 5840 5968 60964192 4320 4448 4576 4704 4832 4960 5088 5216 5344 5472 5600 5728 5856 5984 61124208 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 636144 6272 6400 6528 6656 6784 6912 7040 7168 7296 7424 7552 7680 7808 7936 80646160 6288 6416 6544 6672 6800 6928 7056 7184 7312 7440 7568 7696 7824 7952 80806176 6304 6432 6560 6688 6816 6944 7072 7200 7328 7456 7584 7712 7840 7968 80966192 6320 6448 6576 6704 6832 6960 7088 7216 7344 7472 7600 7728 7856 7984 81126208 6336 6464 6592 6720 6848 6976 7104 7232 7360 7488 7616 7744 7872 8000 81286224 6352 6480 6608 6736 6864 6992 7120 7248 7376 7504 7632 7760 7888 8016 81446240 6368 6496 6624 6752 6880 7008 7136 7264 7392 7520 7648 7776 7904 8032 81606256 6384 6512 6640 6768 6896 7024 7152 7280 7408 7536 7664 7792 7920 8048 8176


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Chapter 1 WCDMA PSCs





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PrincipleThe 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 principle


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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 otherintra-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) theneighboring cell of the primary cell.


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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


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WCDMA PSC palnning 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 differentscrambling code groups.

NOW THE LATTER IS RECOMMANDED


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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 remain partially PSCs in order to network evolution.

WCDMA PSC planning case


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0# PSC is allocated site 0,so 1, 2 and 3# PSC is allocated site

0,too.

If site 0 has three cells, then allocate three 0,1,2#PSC to three

cells and 3# PSC is remained to add a new cell.

we recommend to use the remained PSC when add a new

cell .


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Documents

Huawei WCDMA Primary Scrambling Code Planning