Introduction to WCDMA Network Dimensioning Tool RND
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Transcript of 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
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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?
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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
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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.
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Chapter 1 Overview of Radio Network
Dimensioning
Chapter 2 Introduction to Radio
Network Dimensioning Tool
RND
Chapter 3 Use of Radio NetworkDimensioning Tool RND
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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
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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.
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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
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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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Chapter 1 Overview of Radio Network Dimensioning
1.1 Introduction to Radio Network Dimensioning
1.2 Radio Network Dimensioning Flow
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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Risks to be Mitigated in Radio Network
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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Risks to be Mitigated in Radio Network
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
dimensioning Tool RND
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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Chapter 2 Introduction to Network
dimensioning Tool RND
2.1 Overview of the RND System2.2 Description of RND Functions
2.3 RND Input Parameters
2.4 RND Output Result
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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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Chapter 2 Introduction to Network
dimensioning Tool RND
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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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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RND Input Parameter 2
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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RND Input Parameter 3
General input parameters for link budget:
Supporting the HSDPA link budget: It controls whether to
budget HSDPA links.
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RND Input Parameter 4
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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RND Input Parameter 5
Common input parameters for R99 network dimensioning:
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RND Input Parameter 6
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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RND Input Parameter 7
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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RND Input Parameter 8
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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RND Input Parameter 9
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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RND Input Parameter 11
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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RND Input Parameter 12
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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RND Input Parameter 13
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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RND Input Parameter 14
Advanced engineering input parameters (global parameters and
scenarios):
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RND Input Parameter 15
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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RND Input Parameter 16
Advanced engineering input parameters (dimensioning mode
and sector related parameter):
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RND Input Parameter 17
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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RND Input Parameter 18
Advanced engineering input parameters (service CE, Iub):
RND I t P t 19
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RND Input Parameter 19
Advanced engineering input parameters (service CE, Iub):
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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RND Input Parameter 20
Advanced engineering input parameters (service CE, Iub):
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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RND Input Parameter 21
Advanced engineering input parameters (propagation model):
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RND Input Parameter 22
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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RND Input Parameter 23
Advanced engineering input parameters (equipment):
RND Input Parameter 24
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RND Input Parameter 24
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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RND Input Parameter 25
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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Chapter 2 Introduction to Network
dimensioning Tool RND
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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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
Link budget output result:
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
Link budget output result:
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
Link budget output result:
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
dimensioning Tool RND
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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 of RND dimensioning 1
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
Basic Principle of RND dimensioning 2
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Basic Principle of RND dimensioning 2
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
Basic Principle of RND dimensioning 3
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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
Basic Principle of RND dimensioning 4
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Basic Principle of RND dimensioning 4
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 of RND dimensioning 5
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 of RND dimensioning Result 2
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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Analysis of RND dimensioning Result 3
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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