introduction to wcdma network dimensioning tool rnd

5/24/2018 Introduction to WCDMA Network Dimensioning Tool RND

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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential

Internal

www.huawei.com

WCDMA Radio Network

Dimensioning Tool RND


2/73HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 1

An important step in the radio

network planning design is the

radio network dimensioning. Howis its importance reflected?

What tools are used in the radio

network dimensioning?

How is the radio networkdimensioning performed?



References

W-Radio network dimensioning Operation

Guide

W-Radio Network Planning Design Guide

GENEX RND User Manual

WCDMA Radio Network Pre-Planning

Experience Data Setup Guide



After this course, you will be able to:

Understand the functions and process

of radio network dimensiong.

Grasp the use of the RND tool.

Adjust the input parameters to get an

appropriate output result.



Chapter 1 Overview of Radio Network

Dimensioning

Chapter 2 Introduction to Radio

Network Dimensioning Tool

RND

Chapter 3 Use of Radio NetworkDimensioning Tool RND



Chapter 1 Overview of Radio Network

Dimensioning

1.1 Introduction to Radio Network

Dimensioning

1.2 Radio Network Dimensioning Flow

1.3 Risks to be Mitigated in Radio

Network Dimensioning



Introduction to Radio Network Dimensioning

Radio Network Dimensioning is to make simplified analysis on the future

network, Dimension the scale of network construction (including numberof NodeBs, configuration of NodeB, number of CEs and Iub bandwidth),

and get the data such as construction period, economic cost and human

resources cost, according to such information as coverage objective,

user scale, service proportion, quality requirement provided by operators

and so on.

The more accurate the information collected in the network dimension

phase is, the more value of reference the dimensioning of network scale

has.

The result of the radio network dimensioning directly affects the

investment cost of operators, and the capability of networks to meet thepredefined objective. So, the purpose of the radio network dimensioning

is to obtain the most rational network scale under the requirements of

coverage, capacity and quality predefined by operators.



Chapter 1 Overview of Radio Network Dimensioning

1.1 Introduction to Radio Network Dimensioning


1.3 Risks to be Mitigated in Radio Network

Dimensioning



Radio Network Dimensioning Flow

Iteration dimensioning

Obtain the dimensioning information (including number of users,coverage area and service model and so on)

Coverage dimensioning

Link budget

Output dimensioning result (including number of NodeB, CE

configuration and Iub bandwidth)


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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 9

Chapter 1 Overview of Radio Network Dimensioning

1.1 Introduction to Radio Network Dimensioning


1.3 Risks need to be Mitigated in Radio Network

Dimensioning


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Risks to be Mitigated in Radio Network

Dimensioning 1

dimensioning precision in the phase of radio network pre-planning:

Condition Precision

1No electronic map, propagation model or actual

survey50

2Available with electronic map and actual survey but no

propagation model

70

3Available with electronic map and propagation model

but no actual survey80

4Available with electronic map, propagation model and

actual survey90

And the 10% accuracy, based on the planning engineers' experience

Suppose the dimensioning result is 1,000 sites, 80% of accuracy, and the error of

200 sites will occur.


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Dimensioning 2

dimensioning precision for radio network dimensioning:

radio network dimensioning is the first step for radio network pre-

planning, and the dimensioning precision is lower than that in the whole

phase.

Generation of risks:

Improvement of the dimensioning precision requires large investment of

resources, so this precision is often limited.

In the contract conclusion on the Turnkey project, the scheme providedby Huawei should strictly meet the KPI requirement. If not after network

construction, operators will require Huawei to solve it by adding sites for

free. In this case, business risks may occur.


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Dimensioning 3

Risk Avoidance:

Closely cooperate with departments such as the marketing department;

collect market intelligence (MI); compare the difference between the

number of sites planned by Huawei and that of competitors and analyze

the causes.

Collect information as much as possible before dimensioning. For

example, if there is any restriction on the height of buildings, or the

restriction on the transmission power of the NodeB.

If the customer's objective is delivery of KPI, reserve a certain margin in

the dimensioning of sites, or the precision must be indicated.

Stick to the principle under the pressure of the parties and avoid risks.


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Chapter 1 Overview of radio Network

dimensioning

Chapter 2 Introduction to Radio

Network Dimensioning Tool

RND

Chapter 3 Use of Network

dimensioning Tool RND


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Chapter 2 Introduction to Network


2.1 Overview of the RND System

2.2 Description of RND Functions

2.3 RND Input Parameters

2.4 RND Output Result


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Overview of RND System

The Radio Network Dimensioning (RND) is a module in U-Net. It

can also serve as a piece of independent software for running,

and can be controlled through license by means of authorization.

RND was developed by Huawei and is used to provide assistance

in the 3G Network planning.

RND can implement link budget, coverage dimensioning, capacity

dimensioning, dimensioning of CE resources and dimensioning of

Iub interface traffics. It can calculate the minimum number of

NodeBs and the maximum number of supported subscribers to

meet the input conditions.


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2.1 Overview of the RND System2.2 Description of RND Functions




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RND Function Description 1

Major Functions:

Link budgeting: It aims to define the cell radius. The range

should be determined according to the services with continuous

coverage to be achieved. When the cell radiuses obtained from

the uplink and downlink are different, the smaller value is

preferred.

R99 network dimensioning: It aims to estimate the number of

NodeBs required in a certain condition, the number of CE

resources and the Iub interface traffic required by each site, and

the number of E1s required by each site.

HSDPA dimensioning: It aims to estimate the loading capabilityof HSDPA and use of resources.


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RND Function Description 2

Auxiliary functions:

dimensioning of area coverage probability: It aims to calculate the edge

coverage probability of the target area and the margin of slow fading.

Link balance calculation: It aims to calculate the maximum transmission

power of the downlink service channel when the radius of the

uplink/downlink cell is balanced.

Calculation of HSDPA online subscribers: It aims to calculate the number of

supported subscribers that are online at the same time for the current cell.

Calculation of HSDPA link: It aims to estimate the HSDPA link.

Calculation of single-site CE and Iub: It aims to calculate the number of CEsrequired by a NodeB and the Iub interface traffic.

Graphic statistics function: It aims to view the multi-year tendency chart

after multi-year tasks are established.


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RND Input Parameter 1

Input parameters in black Kai Ti: Generally input by the actual

situation of the project by engineers on the site, and often

adjusted in the later parameter adjustment.

Input parameters in blue highlight: Generally input by the

actual situation of the project by engineers on the site, but

rarely adjusted in the later parameter adjustment.

Input parameters in red italics: Input by engineers according

to the system default or Huawei's recommended value on site,

and hardly adjusted in the later parameter adjustment.


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Initial engineering parameters:

Task selection: Select the

dimensioning task of RND. The

optional values are as follows: Link

budget, R99 network dimensioning,

HSDPA /HSUPA(R5 network

construction) and HSDPA

/HSUPA(R99 upgrade).

Scenario selection: Optional values

include Dense urban, Urban, Suburb,

Rural and Highway. In RND,

different default parameters (such as

users, service traffic, propagation

model) are defined for each scenario.

For the road scenario, RND does not

perform iteration operation.


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General input parameters for link budget:

Supporting the HSDPA link budget: It controls whether to

budget HSDPA links.


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General input parameter for link budget:

RSCP designed margin: Received signal code power (RSCP) is used to

measure the receiving strength of the pilot signal, and designed margin is

defined to calculate the receiving threshold required by the test mobile

phone in drive test.

Ratio of HSDPA power distribution: Refers to the percentage of maximum

power of NodeB occupied by HSDPA.

Ratio of HS-SCCH power distribution: Refers to the percentage of maximum

power of NodeB occupied by the high speed shared control channel (HS-

SCCH). The power of this channel is included in the power occupied by

HSDPA.

Available code resource of HSDPA: Set the number of spread spectrum

codes that can be used by HSDPA, with the input range of 5 - 15.


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Common input parameters for R99 network dimensioning:


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Common input parameters for R99 network dimensioning:

Continuous coverage service: Type of the continuous coverage service.

NodeB diversity: The receiving/transmitting diversity mode of NodeB.

Sector configuration: Sector type of NodeB (Interference factor of

associated adjacent cell and gains of NodeB antenna).

Channel type: Channel model of users, representing the related

environment and moving speed.

Environment selection: Whether to consider indoor environment, which

affects the value of penetration loss and shadow fading standard deviation.

Use of TMA: Whether to use the TMA affects the NodeB noise figure.

Propagation model: For different propagation model, the path loss caused

by the propagation environment can be calculated in different ways, the

cell radius calculated finally will have some difference.


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Ordinary input parameters for R99 network dimensioning:

Cell load: Target load for network operation. The load factor is set to a value

ranging from 0 to 1 (excluding the interval value). The higher the load factor

value is, the larger the total transmission power occupied becomes.

Area coverage probability: The coverage probability of the target area set for

each scenario.

Coverage area: The total area to be covered for each scene.

Total number of users: Total number of users set for each scenario.

Estimated margin: Set a margin for the calculation result of the quantity of

BTSs. Input range 0-1 (including the interval value) refers to the percentageincreased by the final calculation result on the quantity of BTSs originally

calculated.

Maximum TCH transmission power: The maximum transmission power value

for service channel against each service type, in the unit of dBm. It affects

the LER value.


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Ordinary input parameters for R99 network dimensioning:

NodeB antenna height: Antenna height value, which affects the size of the

cell radius.

Maximum number of carriers for each sector: Set the maximum number of

carriers that can be used by each sector.

GoS: Grade of Service. It is a criterion to measure the network congestion.

For the CS service, GoS is represented by blocking probability; for the PS

service, GoS is represented by the probability requirement under a certain

queue delay.

Proportion of indoor users: the percentage of indoor users to the total user

quantity.

Service traffic information: Define the uplink/downlink service traffic for

different services borne by each scene. For the CS service, it refers to a

single user's average traffic in busy hour in the unit of Erl; for the PS service,

it refers to a single user's average throughput in busy time, in the unit of Kbit.

To set the AMR voice service or the PS128 traffic volume, select the service

of other rates through the dropdown menu.


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General input parameter for HSDPA (R5 network construction):

HSDPA networking mode:

Hybrid networking (Share): Both R99 service and HSDPA service share the

same frequency.

Separate networking (Separate): Both R99 service and HSDPA service use

different carrier frequencies.

Total load of cell downlink: In the shared networking mode, input the

total load of resources used by R99 and HSDPA into the downlink linkof the cell.


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RND Input Parameter 10 Ordinary input parameters for HSDPA (R5 network construction):

Maximum number of HSDPA carriers: In the separate networking mode, the

maximum number of carrier frequencies used by the HSDPA service in the cell.

Ratio of HSDPA power distribution: In the separate networking mode, input the

percentage of the HSDPA service power to the total power of BTS.

Ratio of HS-SCCH power distribution: The proportion of the HS-SCCH power tothe maximum transmission power.

Available code resource of HSDPA: Set the number of spread spectrum codes

that can be used by HSDPA, with the input range of 5 - 15.


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General input parameter for HSDPA (R5 network construction):

HSDPA scheduling algorithm:

Proportional fair (PF) is an intelligent and fair scheduling algorithm, taking into

account the scheduling of the HSDPA users under the condition of fast fading,to achieve the balance between the cell throughput and fairness.

At present, this algorithm is applied.

RR (Round Robin): It is a polling algorithm, to enable each user to occupy the

sub-frames and power that can be allocated in the same probability. From the

probability of resource occupation, this scheduling algorithm is the fairest, but

not taking into account the quality of user channels, so its throughput is poor.

HSDPA service traffic information: HSDPA throughput of a single user in busy

hour.


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General input parameter for HSDPA (R99 updating):

R99 area coverage probability: area coverage probability of the

original R99 network before HSDPA is introduced.

R99 cell radius: cell radius value of the original R99 network in each

scenario

Actual R99 downlink load: In the separate networking mode, it refers

to the actual load of the downlink link in the original R99 network.


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Ordinary input parameter for HSDPA (R99 updating):

Number of carrier frequencies actually used by R99: Number of

carrier frequencies used by the services in the original R99

network in the shared networking mode.

Maximum available code resource of HSDPA: The maximum

code resources that HSDPA can use when the R99 service has

occupied certain code resources.


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Advanced engineering input parameters (global parameters and

scenarios):


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Advanced engineering input parameters (global parameters and scenes):

Pilot channel power (dBm): It is set to 33 dBm generally.

Downlink non-orthogonalized factor: Average non-orthogonalized factor of cell

downlink.

Soft handover countermeasure fast fading gain: Due to the function of

combined macro diversities, soft handover reduces the Eb/No value requiredby the single radio link, and brings the additional macro diversity gain for

countermeasure fast fading.

PenetrationLoss(indoor): Indoor penetration loss

PenetrationLoss(outdoor): Outdoor penetration loss

PenetrationLoss(incar): Incar penetration loss

StdDevIndoor: Indoor slow fading standard deviation

StdDevOutdoor: Outdoor slow fading standard deviation


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Advanced engineering input parameters (dimensioning mode

and sector related parameter):


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Advanced engineering input parameters (dimensioning mode and

sector related parameter): dimensioning Mode:

Only adjusting the cell radius: When the capacity of the whole network, the

capacity is increased only through shrinking the cell radius.

Adjusting the number of carrier frequencies -> cell radius: To raise the cell load,

add the number of carrier frequencies and then reduce the cell radius, and endthe adjustment when the coverage and capacity balance or adjustment range is

limited. Sectoring Parameter:

Sector related parameters

GainofAntenna: Antenna gain. It affects the output value of EIRP of the

downlink link.

InterferenceFactor: Neighbor interference factor, which affects the interference

from the signals of other cell users.


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Advanced engineering input parameters (service CE, Iub):

RND I t P t 19


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CEs per NULP: the number of CEs that each uplink board is able toprocess in NodeB.

CEs per NULP: the number of CEs that each downlink board is able to

process in NodeB.

Number of FACH (signals): the number of FACH for signaling in one cell.

Number of FACHs (data): the number of FACH transmitting data in one

cell.

Burst service redundancy: Burst probability of PS service.

NodeB operation maintenance traffic (kbps): traffic used by NodeB for Iubmaintenance.

SupSoftHandover: It controls whether to support soft handover.

Active Factor UL: Uplink active factor.


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Active Factor DL: Downlink active factor.

ULEquivalentCENumber: Number of uplink equivalent CEs.

DLEquivalentCENumber: Number of downlink equivalent CEs.

RBSpeed: Bearer speed.

BodyLoss: Body loss.

BLERBlock error rate.

FastFadingMarginUL: Uplink fast fading margin.

FastFadingMarginDL: Downlink fast fading margin.

Eb/No UL: Uplink Eb/No.

Eb/No DL: Downlink Eb/No.


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Advanced engineering input parameters (propagation model):


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Advanced engineering input parameters (propagation model):

Semi-empirical model:

Standard Propagation Model (SPM)

Asset Propagation Model

Empirical model: Cost231-Hata Propagation Model

Okumuru-Hata Propagation Model


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Advanced engineering input parameters (equipment):



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Advanced engineering input parameters (equipment NodeB):

Equipment type: Select a BTS model, each of which corresponds to an

optional transmission power.

Maximum power (dBm): Maximum transmission power of single carrier

supported by BTS.

Background Noise Level (dBm): Background noise level of NodeB.

Noise coefficient (No TMA, dB): Noise coefficient in the case of no tower-

mounted amplifier.

Noise coefficient (TMA, dB): Noise coefficient in the case of tower-mounted

amplifier.

Feeder type: Two defined feeder types: 7/8 and 5/4, or self-defined feeder

types.

Feeder loss (dB/100m): The loss for every 100 m feeder.

Connector loss (dB): The loss value of the feeder connector, including the

connector loss of tower-mounted amplifier and feeders.

TMA gain: Optional values are 12 and 24.


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Advanced engineering input parameters (equipment UE):

Antenna height (m): height of the UE antenna.

Antenna gain (dBi): Transmission power gain of the UE antenna.

Background Noise Level (dBm): Background noise level of UE.

Feeder loss: Loss of receiving antenna of UE.

Noise coefficient: Receiving noise coefficient of UE.


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RND Output Result 1

The output result in red Highlight: important output result.

The output result in black italic: minor output result.

Output result in blue Kaiti: intermediate result in the dimensioning,

and is involved in the next operation.


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RND Output Result 2

Link budget output result:

Cable loss Tx(dB)

Uplink: Decided by the feeder loss of UE.

Downlink: Decided by the feeder loss of BTS; formula: 100 m loss of feeder x

length of feeder x loss of connector.

Cable loss Rx(dB)

Uplink: Decided by the feeder loss of BTS; formula: 100 m loss of feeder x

length of feeder x loss of connector.

Downlink: Decided by the feeder loss of UE.

Interference margin (dB): Interference margin. The noise rising space

allowed by the system. The larger the interference margin is, the higher

the load capability of network becomes.

RND O R l 3


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RND Output Result 3


EIRP(dBm): EIRPEquivalent Isotropic Radiated Powerrefers to the sum of

the transmission power output, the transmission system loss and the antenna

gain of transmitter for each service channel in the maximum radiation direction.

Formula: EIRP = Maximum transmission power of service channel(dBm)-

feeder loss (dB) of transmitting end - body loss (dB) + transmitting antenna

gain (dBi).

Noise figure(dB): defined as the ratio of the input SNR to the output SNR.

Uplink: Noise coefficient is decided by the noise coefficient of NodeB.

Downlink: Noise coefficient is decided by the noise coefficient of UE.

Fast-fading margin(dB): Compensation for fast fading by the rapid closed-loop

power control.

RND Output Result 4


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RND Output Result 4


Receiver sensitivity (dBm): Signal level required when the receiver input meets

the required Eb/No. Calculation formula: Receiving sensitivity = -174(dBm/Hz)+NF(dB)+10log[1000 Rb(kHz)] + required Eb/No (dB).Here, -

174(dBm/Hz) is the thermal noise constant; for the uplink, NF is the set top

interface noise coefficient; for the downlink, NF is the UE noise coefficient; Rb

(KHz) is the bearer rate.

Min Signal Reception Strength (dBm): Minimum strength reception strength(dBm). Indicates the minimum signal strength required by correct demodulation.

Formula: Minimum signal strength (dBm) = Receiver sensitivity + feeder loss +

body loss - receiver antenna gain (dBi) + interference margin + background

noise margin - soft handover countermeasure fast fading gain + fast fading

margin.

Slow-fading margin(dB): Calculate the probability of cell area coverage to get

the probability of cell edge coverage, and then get the slow fading margin

through calculating of the edge coverage probability and the slow fading

standard deviation.


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RND Output Result 5


Path loss (dB): Formula: Path loss = Valid transmission power (EIRP) -Minimum receiving signal strength - Building penetration loss - Slow fading

margin + soft handover countermeasure slow fading gain.

Cell radius (km): It is obtained through calculation of path loss, carrier

frequency, UE antenna height, NodeB antenna height and propagation model.

HSDPA cell edge Ec/Io (dB): HSDPA cell edge, Ec/Io. The Ec/Io value of theHSDPA service of the cell edge, which is obtained through calculation of

transmission power, neighbor interference and coupling loss.

HSDPA cell edge throughput(Kbps): Average edge rate of the HSDPA cell.

The data throughput of cell edge when the HSDPA service is used.

RSCP: Pilot signal power received by UE.

Ec/Io: Ec/Io value of the pilot channel received by UE.

RSCP required by DT: Obtained through the calculated RSCP value plus the

RSCP designed margin.


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RND Output Result 6

Output result of R99 network dimensioning: User density: Formula: User density = Total number of users/coverage

area (km2).

Coverage area (NodeB, km2) : site area.

Actual load (UL): The load calculated according to the current number

of users and cell radius (downlink should be considered).

User number in cell coverage: Calculation formula: Number of users in

cell coverage = Cell area x user density.

Target load user number (cell): The number of cell users obtained

through calculation of the target load.

RND Output Result 7


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RND Output Result 7

Output result of R99 network dimensioning:

Current actual user number (cell): It means the number of users actually

supported by the current cell, and is decided by the minimum value of thenumber of users under cell coverage and the number of the target load user

number.

Target load user number (network): Formula: The maximum number of

target load users = Number of sites estimated x number of sectors for each

site x number of carrier frequencies per sector x (the minimum value from

the number of cell uplink target load users and the number of cell downlink

target user number).

Current actual user number (network): Current actual number of users

(network).Formula: Number of users actually supported by the current

network = Number of sites estimated x number of sectors for each site x

number of carrier frequencies per sector x number of actual users in the cell

currently.

Required NodeB number: Number of BTSs required. Formula: Number of

BTSs required = coverage area/site area x (1 + estimated margin).

RND Output Result 8


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RND Output Result 8

Output result of R99 network dimensioning:

CEs (UL) and CEs (DL): Peak number of channel units required by the

uplink/downlink of each BTS.

CEs (UL) and CEs (DL)_Mean: Average number of channel units

required by the uplink/downlink of each BTS.

Card number(UL) and Card number(DL): Number of cards. With theobtained peak value of the uplink/downlink CEs (UL)/(DL) and NodeB

through calculation, the number of uplink/downlink CEs that boards can

support can be determined.

NodeB Iub Interface throughput (Kbps): The total traffic of the NodeB Iub

calculated according to the average traffic volume of a single NodeB.

E1 number: E1 number needed by NodeB that is calculated according to

the total throughput of the NodeB Iub.


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RND Output Result 9

Output result of HSDPA network dimensioning (R5 network construction):

Cell radius(km)In the R99 network dimensioning, the method of networkiteration dimensioning is used to calculate the cell radius.

HSDPA cell actual throughput(Kbps): Calculated according to the loading

capability of the HSDPA cell.

HSDPA cell target throughput(Kbps): Calculated according to the quantity of

HSDPA cell users and traffic volume.

HSDPA actual used code number: HSDPA Actually-used code resource.

Calculation formula: Used quantity = Total code resource - Code resource

occupied by public channel - Code resource occupied by the R99 service

Actual power allocation ratio: Calculated according to the actual throughput of

the HSDPA cell.


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RND Output Result 10

Output result of HSDPA network dimensioning (R5 network

construction):

Required power by target throughput: The ratio of HSDPA power

distribution calculated according to the target throughput of the HSDPA

cell.

HSDPA actual cell edge throughput (Kbps): Actual edge rate of the

HSDPA cell. Data transmission rate of cell edge HSDPA.

HSDPA Iub Interface throughput(Kbps): Throughput of the HSDPA

service on the Iub.

NodeB Iub Interface throughput (Kbps): Total throughput of the HSDPA

and R99 service on the Iub.

E1 number: E1 number needed by NodeB that is calculated according to

the total throughput ofthe NodeB Iub.


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RND Output Result 11

Output result of HSDPA network dimensioning (R99 updating):

HSDPA actual carrier number: Actual number of carriers of HSDPA.

Shared networking: Number of carriers already used by the R99 network.

Separate networking: Number of carrier frequencies currently used by the

calculated HSDPA, which is the same as the recommended number of carrier

frequencies of HSDPA.

HSDPA suggested carrier number: Recommended number of carrierfrequencies of HSDPA. Number of carrier frequencies used by HSDPA

when it meets the target throughput rate calculated according to the

traffic volume.

R99 area coverage probability after HSDPA introduction: Probability of

R99 area coverage after HSDPA is introduced. The area coverage

probability of R99 after upgrading HSDPA calculated according to the

input current R99 service area coverage probability and the link use

information of HSDPA.


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Chapter 1 Overview of radio Network

dimensioning

Chapter 2 Introduction to Networkdimensioning Tool RND

Chapter 3 Use of Network



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Chapter 3 Use of Network dimensioning Tool

(RND)

3.1 RND Operation Procedure

3.2 Basic Principle of RND dimensioning

3.3 Analysis of RND dimensioning Result

RND O ti P d 1


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RND Operation Procedure 1

New project: Setting task, year and scenario.

Input parameter: Inputting general parameters and advanced

parameters

Calculate the project:

Link budget

Network dimensioning

Coverage dimensioning: Calculate the load of the current network but only

giving a consideration to the network coverage on the basis of cell radius

from the link budget.

Iteration dimensioning: In the case of unbalance between coverage and

capacity, the cell parameters can be adjusted constantly to achieve the

balance of links, with the requirements of network coverage and network

capacity taken into account.


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RND Operation Procedure 2

View the output result:

If theresult is rational and meets the requirements, the

dimensioning ends.

If the result is irrational and does not meet the

requirements, modify the input parameters and makedimensioning again.


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Chapter 3 Use of Network dimensioning Tool RND

3.1 RND Operation Procedure

3.2 Basic Principle of RND dimensioning3.3 Analysis of RND dimensioning Result

Basic Principle of RND dimensioning 1


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Basic principle foruplink link budget

Start uplink budget

Obtain the input information of

uplink budget

Calculate the EIRP of UE and the

minimum signal strength of NodeB

Calculate the uplink path loss

Calculate the radius of cells

End uplink budget



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Basic principle fordownlink link budget

Start downlink budget

Obtain the input information ofdownlink budget

Calculate the downlink EIRP and

the minimum signal strength of UE

Calculate the downlink path loss

Calculate the radius of cells

End downlink budget



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p g Basic principle for R99 network iteration dimensioning:

Cell radiusNumber ofcarriers

Cell areaNumber of userscovered in the cell

Is the capacitycoverage balanced?

dimensioning of uplink/downlinkcapacity

Comparison

Yes

No

Information aboutuplink/downlink service

Density of users

Adjust the radius of cellsand number of carriers Output result



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Basic principle for R5 network iteration dimensioning

Allocation of powerresourcesand code resource

R99 network

HSDPAnetwork

Cell radius

R99 network iterationdimensioning

dimensioning ofHSDPA capacityYes

Meet the capacityrequirement?Output result

No

Adjustment

B i P i i l f RND di i i 5


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Basic principle for the network iteration dimensioning on R99

updated to HSDPA:

Follow the radius of the R99 cell.

Estimate the coverage probability of the R99 network.

Estimate the average rate and edge rate of HSDPA each cell can

support.


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Chapter 3 Use of Network dimensioning

Tool RND

3.1 RND Operation Procedure3.2 Basic Principle of RND dimensioning

3.3 Analysis of RND dimensioning Result


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Analysis of RND dimensioning Result 1

Analysis on the link budget result:

Uplink restricted: The radius of the downlink cell is larger than that of

the uplink cell, and the radius of the downlink cell is used as the input

radius for the network coverage dimensioning.

Downlink restricted: The radius of the uplink cell is larger than that of

the downlink cell, and the radius of the downlink cell is used as the

input radius for the network coverage dimensioning.

Uplink/downlink link balance: The radius of the uplink/downlink cell is

roughly equal.

When the difference between the radius of the uplink/downlink cell is

too large, the input parameters can be adjusted to balance the uplink

link and the downlink link.

A l i f RND di i i R lt 2


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Analysis on network dimensioning result:

Coverage restricted: The radius from coverage dimensioning

is equal to the result of iteration dimensioning, or the number

of the NodeB from the coverage dimensioning is equal to the

result of the iteration dimensioning.

Capacity restricted: The radius from coverage dimensioning is

larger than the result of iteration dimensioning, or the number

of the NodeB from the coverage dimensioning is smaller than

the result of the iteration dimensioning.

A l i f RND di i i R lt 3


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Common methods for changing the cell radius:

Adjust the service type of the continuous coverage.

Consider using tower-mounted amplifier (applied to the

case of uplink coverage limited).

Adjust the maximum transmission power of

uplink/downlink TCH.

Adjust the area coverage probability.

Adjust the uplink/downlink load of cells.

Consider the coverage of the outdoor signals on the

indoor environment.

Adjust the transmission power of BTS.


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Conclusion

radio network dimensioning could

achieve the most appropriate result

instead of the best result.

The network planning personnel must

master the input and output

requirements accurately to plan the

network scale properly.


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Thank you!www.huawei.com

introduction to wcdma network dimensioning tool rnd

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