59776966 008 wcdma primary scrambling code planning
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Internal
WCDMA Primary Scrambling Code Planning
ISSUE 1.0
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object
Upon completion this course, you will be
able to:
Understand the principles for cell primary
scrambling codes allocation in the WCDMA
network
Understand how to plan the cell primary
scrambling codes (PSC)
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ChapterChapter 11 WCDMA PSCs
Chapter 2 WCDMA PSC planning principle
Chapter 3 WCDMA PSC planning method
Chapter 4 WCDMA PSC planning case
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Scrambling code GOLD sequence.
Scrambling code period : 10ms ,or 38400 chips.
The codes used for scrambling of the uplink physical channels may be of
either long or short type, There are 224 long and 224 short uplink scrambling
codes. Uplink scrambling codes are assigned by higher layers. Due to a
great quantity of uplink scrambling codes is exist and uplink scrambling
codes is allocated by RNC, so we are not give it our attention.
For downlink physical channels, a total of 218-1 = 262,143 scrambling codes
can be generated. scrambling codes k = 0, 1, , 8191 are used. These
8192 codes are divided into 512 groups, each of which contains 16scrambling 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. So
we will give it our attention In RNP.
WCDMA Scrambling CodesWCDMA Scrambling Codes
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Scramblingcodes fordownlinkphysicalchannels
Set 0
Set 1
Set 511
Primaryscrambling code 0
Secondary
scrambling code 1
Secondaryscrambling code
15
Primaryscrambling code
511
16
Secondaryscrambling code
511
16
15
8192scrambling
codes
512 sets
A primary scrambling code and 15 secondary scrambling codes are included in a set.
Downlink Scrambling CodesDownlink Scrambling Codes
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Group 0
Group 1
Group 63
512 primaryscrambling codes
64 primary scramblingcode groups
Each group consists of 8primary scrambling codes
Downlink Primary Scrambling Code GroupsDownlink Primary Scrambling Code Groups
Primaryscramblingcodes fordownlink
physicalchannels
Primaryscrambling code 0
Primaryscrambling code 1
Primaryscrambling code 7
Primaryscrambling code
8*63
Primaryscrambling code
63*8
7
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Downlink Primary Scrambling Codes
203219041776164815201392126411361008880752624496368240112PSC_8
2016188817601632150413761248112099286473660848035222496PSC_7
2000187217441616148813601232110497684872059246433620880PSC_6
1984185617281600147213441216108896083270457644832019264PSC_5
1968184017121584145613281200107294481668856043230417648PSC_4
1952182416961568144013121184105692880067254441628816032PSC_3
1936180816801552142412961168104091278465652840027214416PSC_2
192017921664153614081280115210248967686405123842561280PSC_1
1514131211109876543210
/
4080395238243696356834403312318430562928280026722544241622882160
4064393638083680355234243296316830402912278426562528240022722144
4048392037923664353634083280315230242896276826402512238422562128
4032390437763648352033923264313630082880275226242496236822402112
4016388837603632350433763248312029922864273626082480235222242096
4000387237443616348833603232310429762848272025922464233622082080
3984385637283600347233443216308829602832270425762448232021922064
3968384037123584345633283200307229442816268825602432230421762048
31302928272625242322212019181716
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Downlink Primary Scrambling Codes
6128600058725744561654885360523251044976484847204592446443364208
6112598458565728560054725344521650884960483247044576444843204192
6096596858405712558454565328520050724944481646884560443243044176
6080595258245696556854405312518450564928480046724544441642884160
6064593658085680555254245296516850404912478446564528440042724144
6048592057925664553654085280515250244896476846404512438442564128
6032590457765648552053925264513650084880475246244496436842404112
6016588857605632550453765248512049924864473646084480435242244096
47464544434241403938373635343332
8176804879207792766475367408728071527024689667686640651263846256
8160803279047776764875207392726471367008688067526624649663686240
8144801678887760763275047376724871206992686467366608648063526224
8128800078727744761674887360723271046976684867206592646463366208
8112798478567728760074727344721670886960683267046576644863206192
8096796878407712758474567328720070726944681666886560643263046176
8080795278247696756874407312718470566928680066726544641662886160
8064793678087680755274247296716870406912678466566528640062726144
63626160595857565554535251504948
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ChapterChapter 11 WCDMA PSCs
Chapter 2 WCDMA PSC planning principle
Chapter 3 WCDMA PSC planning method
Chapter 4 WCDMA PSC planning case
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Principle
The intra-frequency cells interfering to the
primary cell cannot use the same cell PSCs
as the primary cell !
Which cells are included in the intra-frequency
cells interfering to the primary cell?
- Adjacent cell
- Neighboring cell
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What is adjacent cell ?
These cells interfering to the primary cell are adjacent cellsof the
primary cell. Any cell may be a primary cell with adjacent cells.
What is neighboring cell ?
Besides, neighboring cells exist in the adjacent cells of the primary
cell. 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 cellof theprimary cell.
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WCDMA 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.
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ChapterChapter 11 WCDMA PSCs
Chapter 2 WCDMA PSC planning principle
Chapter 3 WCDMA PSC planning method
Chapter 4 WCDMA PSC planning case
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WCDMA PSC planning method The cell PSCs can be planned in one 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 cellsbelonging to different scrambling code groups.
NOW THE LATER IS RECOMMENDED
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ChapterChapter 11 WCDMA PSCs
Chapter 2 WCDMA PSC planning principle
Chapter 3 WCDMA PSC planning method
Chapter 4 WCDMA PSC planning case
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In general, there is less 4 intra-cells in a site in actual network.
So we can divide a group (8 PSCs every group) to 2 subgroups
(4 PSCs every subgroup).
512 PSCs can divide 128 subgroups. The first PSC every
subgroup take part in the PSC allocation ,the other PSCs are
allocated the same cell.
We must remain partially PSCs in order to network evolution.
(for example next figure gray PSCs will be remained .)
WCDMA PSC planning caseWCDMA PSC planning case
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WCDMA PSC planning case
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WCDMA PSC planning case
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WCDMA PSC planning case
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WCDMA PSC planning case
0# PSC is allocated site 0,so 1,2,3# PSC is allocated site0,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
In each cluster there are 16 column of scrambling codes
In each column there are 4 codes which belong to one code
group, so they can be used for one site if the sector number of
the site is less or equal than 4
Normally we use 12 columns in each sub-cluster, and the back 4
columns (grey ones) are reserved for future use, such as
capacity expansion or problem solve
Cluster 1-7 are used for outdoor sites, cluster 8 is used for
indoor sites
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WCDMA PSC planning case
416424432288296304
408384440280256312
400392448272264320
472464456344336328
160168176324048
15212818424056
14413619216864
216208200888072
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WCDMA PSC planning case
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WCDMA PSC planning case
D=12r
D=14r
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WCDMA PSC planning case
D=12r
D=15.2r
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WCDMA PSC planning case
D=14r
D=13.4r
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WCDMA PSC planning case Scheme (1): The min reuse distance is 12r, the max reuse distance is 14r,
r is the cell radius
Scheme (2): The min reuse distance is 12r, the max reuse distance is
15.2r
Scheme (3): The min reuse distance is 13.4r, the max reuse distance is
14r
With comparing we can see scheme (2) and (3) are better than (1)
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WCDMA PSC planning case
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