Neighbor Cell and Scrambling Code Planning

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

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30pt

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Neighbor Cell and

Scrambling Code

Planning Introduction of CNA and SCP

ISSUE 4.0

RNP Staff Training Dept.

HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 3

After this courseyou will

Know how to use the CNA tool;

Know how to use the SCP tool.


1 Neighbour cell planning

2 Scrambling planning


Neighbour cell planning

Purpose:

guarantee UE can make handover smoothly to other cells

Conditions:

between the cells which have overlapping area

Signal strength is strong enough to make handover



Configure the co-site sectors as neighbor cells

Configure directly close cells by locations as neighbor cells

Normally the neighbor relation should be bidirectional, single direction

neighbor only was applied in few special occasions

In dense urban and urban area, neighbor cells should be configure

more, but less than 31

In suburban and rural area, the possible neighbor relations should be

configured to guarantee the handover, even the distance between cells is

big.

The priority is unnecessary

Principles to configure manually neighbor cells:



Example to configure manually neighbor cells:

Co-site cells

Cells face each other directly

Cells by same direction

Cells face each other through other cells

Source cell



Tool:

-CNACell Neighbour Allocation)

Data Preparation:

We need to prepare the following data as the template under the folder \Input:

ATemplate of Cell Engineer parameter : cellinfo _ template .xls

BPropagation Model file : propagation _ model .txt

C: Antenna direction plot file : DEFAULT ,under the folder of AntennaPattern.



Data explanation:

AFirst cell data is made in cellinfo _template.xlsthen save as txt file :cellinfo .txt

fig1Input information of cell data



Data explanation:

BSPM propagation model parameter is defined in Propagation_model.txt.

fig2Input information of propagation model



Data explanation:

CAntenna information

fig3Antenna information



Check configuration file :CAN _ config .txt (file name cant be

changed:

Modify the parameters and input/output file name according to

different scenario:

aparameter configuration

1Calculated _bin _size m=:20

2Calculated _SHO _threshold dB=:6

3MaxIntraFreqNBCellsbyCPL=:15 value range131

4MaxIntraFreqNBCellsbyDistance=:15 value range 031



Check configuration file :CAN _ config .txt (file name cant be

changed:

bfile setting

1 Cellinfo _file=:.\input\cellinfo .txt

2 Cellneighbour _file=:.\output\cellneighbour.txt

3 Coor _ trans_file=:.\output\ GaussianPlanarRectCoor .txt.

4 Antenna _ pattern _Dir=:.\input\ antennapattern.

5 Propagation _model _file=:.\input\Propagation_model.txt.



Check configuration file :CAN _config .txt (file name cant be

changed:

bfile setting

6 Path _loss _file _Dir=.\Output\PL

7 SHO _Array _file=.\Output\ SHO _Array .txt

8 Cell _NB _by _CPL _file=.\Output\ Cell _NB _by _CPL .txt

9 CAN _statis _file=.\Output\ CAN _statis .txt



Check configuration file :CAN _config .txt (file name cant be

changed:

bfile setting

fig4configuration file information



After data preparation, execute CAN .exebegin to Neighbour cell

planning

fig5execute result



fig6execute result



We can get the neighbour cell in the output folder.

fig7CNA_statis


1 Neighbour cell planning

2 Scrambling planning


Scrambling planning

Scrambling resources analysis:

The object of Scrambling planning is 512 downlink main

scrambling

Scrambling planning tool:

-SCPScrambling Code Planning)


Scrambling planning

Scrambling steps

Parameters settingdefine the main configuration in file

SCP _config.txt,such as minimum reuse distance,total

useful scramblings and so on;

Data configurationaccording to user manual,make file

cellinfo.txt and neighbour cell file:cellneighbor.txt

Planning adjustexecuteanalysis planning result and

adjust;


Scrambling planning

Scrambling planning steps

Parameter setting

Setting the following parameters in file SCP_config.txt.

[1]Nmax=: 5

[2]Distance_threshold[Km]=: -1

[3]Min_PSC_code=: 0

[4]Max_PSC_code=: 511

[5]Reserved_PSCs_per_group=: -1


Scrambling planning


Data preparation

Engineer parameters file and neighbour cell relationship file are as

following


Scrambling planning


Data preparation

fig7cell information


Scrambling planning

Scrambling planning steps:

Data preparation

Fig8:neighbour cell table


Scrambling planning

Scrambling planning steps :

Execute:

fig8execute result


Scrambling planning

Scrambling planning steps :

Planning adjust

The purpose of planning and adjust are :

A)The scrambling allocation to all cells succeed;

B)The scrambling allocated as fewer as possible,and the minimum reuse

distance is as large as possible.

We can adjust by modifying the parametessuch as A)allow/forbidden allocation scrambling set;

B)Reuse distance;

C)Neighbour relationship

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Neighbor Cell and Scrambling Code Planning