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CDMA RF Planning Unit 1
CDMA Wireless Network Planning Process
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Main Content
Reasons for Network Planning
Aim of Network Planning
Steps in Network Planning
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Reasons of Network Plan
Coverage varies with the followingparameters
System loading
Velocities of mobile users
Data rateBoundary of soft handoff is variable
Complexity of the practical system
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Main Content
Reasons for Network Planning
Aim of Network PlanningSteps in Network Planning
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Aim of Network Plan
Best possible coverage in the service areas
Forecast traffic distribution precisely, design thebest possible Base Station topology
Optimal system parameters for best Quality of
ServiceFewest equipment and lowest cost whencapacity and QOS requirement are met
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Main Content
Reasons for Network Planning
Aim of Network Planning
Steps in Network Planning
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Steps in Network Planning
Pre-research
of Project
Requirement
Analysis
Survey of
Provided
Sites
Reduce
Process
Network
Evaluation
Wireless
Environment
Test
Site
Distribution
Design
Survey
ReportSubmission
Site Survey
Network Plan
Simulation
PN and
NeighborPlanning
Wireless Plan
Report
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Pre-research
of Project
Requirement
Analysis
Survey of
Provided
Sites
Reduce
Process
NetworkEvaluation
WirelessEnvironment
Test
SiteDistribution
Design
Survey
Report
Submission
Site Survey
Network Plan
Simulation
PN and
Neighbor
Planning
Wireless Plan
Report
Pre-Research of Project
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Examine the content and acceptance
standards of the project contract
Conduct survey of the
environment of the project site, if
necessary
Amend the items of the contract
that cannot be realized
Pre-Research of Project
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Requirement Analysis
Pre-research
of Project
Requirement
Analysis
Survey of
Provided
Sites
Reduce
Process
NetworkEvaluation
WirelessEnvironment
Test
SiteDistribution
Design
Survey
Report
Submission
Site Survey
Network Plan
Simulation
PN and
Neighbor
Planning
Wireless Plan
ReportUnRegis
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Determine the detailed customer requirementfor the network
Survey the status of the existing network and
find out the development plan
Forecast both the short-term and long-termtraffic demand
Clarify and establish the acceptance standards
Investigate the wireless propagationenvironment (such as topography &
physiognomy)
Verify the traffic distribution
Requirement Analysis
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Requirement Analysis
Topography &physiognomy
Population distribution
Coverage demand
Wireless frequencyoccupation
Strategy for developingsubscribers
Information of providedsites
Traffic distribution
Demand of systemparameters
Special demand
OUTPUT:
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Demand Analysis - Two key points
Coverage demand
(Coverage boundary)
Traffic demand
(Important area)Un
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Survey of Provided Sites
Pre-research
of Project
Requirement
Analysis
Survey of
Provided
Sites
Reduce
Process
Network
Evaluation
Wireless
Environment
Test
Site
Distribution
Design
Survey
ReportSubmission
Site Survey
Network Plan
Simulation
PN and
NeighborPlanning
Wireless Plan
Report
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Survey of Provided Sites
Collect information about the wirelesspropagation environment of the provided
sites.
In case these sites meet the topological
structure of the network and the users'needs, try to make these provided sitesworkable to reduce investment
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Reduce Process
Pre-research
of Project
Requirement
Analysis
Survey of
Provided
Sites
Reduce
Process
NetworkEvaluation
WirelessEnvironment
Test
SiteDistribution
Design
Survey
Report
Submission
Site Survey
Network Plan
Simulation
PN and
Neighbor
Planning
Wireless Plan
ReportUnRegis
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Reduce Process
According to the analysis report of therequirement and sites survey result, decide
suitable procedure of the project.
Some following Working content might be cut
down after this stage.
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Network Evaluation
Pre-research
of Project
Requirement
Analysis
Survey of
Provided
Sites
Reduce
Process
NetworkEvaluation
Wireless
Environment
Test
Site
Distribution
Design
Survey
Report
Submission
Site Survey
Network Plan
Simulation
PN and
Neighbor
Planning
Wireless Plan
ReportUnRegis
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Carry out some tests to
evaluate customer's existing
network, and according to the
result plan the network
construction for the next stage.
Network Evaluation
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Wireless Environment Test
Pre-research
of Project
Requirement
Analysis
Survey of
Provided
Sites
Reduce
Process
NetworkEvaluation
Wireless
Environment
Test
Site
Distribution
Design
Survey
Report
Submission
Site Survey
Network Plan
Simulation
PN and
Neighbor
Planning
Wireless Plan
ReportUnRegis
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Wireless Environment Test
Scan the planned
coverage area to make
sure the frequency
spectrum is clean
Perform correction of the
propagation model by CWT(continuous wave transmitter)
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Spectrum Scanning
Interference with wide bandwidth and 3dB more than the thermalnoise will provide strong interference with CDMA system
Narrowband Interference
Broadband InterferenceUnRegis
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Site Distribution Design
Pre-research
of Project
Requirement
Analysis
Survey of
Provided
Sites
Reduce
Process
NetworkEvaluation
Wireless
Environment
Test
Site
Distribution
Design
Survey
Report
Submission
Site Survey
Network Plan
Simulation
PN and
Neighbor
Planning
Wireless Plan
ReportUnRegis
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Site Distribution Design
Set up the BStopology according tothe results of the link
budget and capacitycalculations. Theexisting sites shouldbe used as much aspossible.
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Link budget
Determine maximum path lossallowed
Determine maximum cell radius
Downlink and uplink
Keep balance
uplink
downlink
Mobile BTSCableloss
Antennagain
Pathloss
Antennagain
Cableloss
Margin
building
Margin slow fade + penetrationloss+...
Link budget
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Capacity LimitedCall drop ratio rise
Difficult To Access
Voice quality drop
Capacity Calculation
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Blue represents 1 pilot
Green represents 2 pilot
Yellow represents 3 pilot
Ideal Topology
Red represents 4 pilot or moreWhite represents no pilot coverage
Legend:
Unideal Topology
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Site Selection Principles
The density layout of BTS should beaccording to the traffic densitydistribution
Coverage of important users and
dense areas should be guaranteedChoose existing telecom centerbuildings or microwave sites ifpossible
Perform simulation to verify pilot
pollution areas and blind spots
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Pilot Pollution and Blind Spots
The uneven distribution ofsites can cause pilotpollution to some extent.These topographical surfacefeatures (such as hills, highbuildings, etc..) bring a lot of
reflection and obstruction.Reflection causes pilotpollution while obstructioncauses blind spotsWhen we try to clear up oneblind area, usually somepilot pollution area produced.
Or when we try to clear upone pilot pollution area,some blind area produced.U
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Site Survey
Pre-research
of Project
Requirement
Analysis
Survey of
Provided
Sites
Reduce
Process
NetworkEvaluation
Wireless
Environment
Test
Site
Distribution
Design
Survey
Report
Submission
Site Survey
Network Plan
Simulation
PN and
Neighbor
Planning
Wireless Plan
ReportUnRegis
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Site Survey Principles
Final site location may deviate by no more than1/4 of the cell radius from the initial location
Convenient traffic, reliable electricity, safeenvironment should also be considered
Avoid high building obstructions, avoid strongwireless transmitter, radar or other seriousinterference
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Avoid obstruction near the site
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Avoid gorge wave-guide effectin narrow street
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Site Survey Result
Cell sites may be moved, and cellconfiguration and directions may bemodified according to the site survey result
The sites are distributed evenly ,andaccord with traffic density distributionU
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Survey Report Submission
Pre-research
of Project
Requirement
Analysis
Survey of
Provided
Sites
Reduce
Process
NetworkEvaluation
Wireless
Environment
Test
Site
Distribution
Design
Survey
Report
Submission
Site Survey
Network Plan
Simulation
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Neighbor
Planning
Wireless Plan
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Find out the customer's
suggestion on the preliminarily
selected planning sites, andsubmit the report.
Survey Report Submission
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Network Plan Simulation
Pre-research
of Project
Requirement
Analysis
Survey of
Provided
Sites
Reduce
Process
NetworkEvaluation
Wireless
Environment
Test
Site
Distribution
Design
Survey
Report
Submission
Site Survey
Network Plan
Simulation
PN and
Neighbor
Planning
Wireless Plan
ReportUnRegis
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Network Plan Simulation
Carry out simulation to verify the wirelessplanning and design.
Guarantee the plan to meet the customer'sdemand .
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Rx Power Forward Link
Pilot Coverage Forward LinkB A
B
H
LH
B
B
G
F
H
B
H
GB
A
H
B
F
F
B
F
H
B
F
K
FB
F
Tx Power Reverse Link
Simulation Result
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PN and Neighbor Planning
Pre-research
of Project
Requirement
Analysis
Survey of
Provided
Sites
Reduce
Process
Network
Evaluation
Wireless
Environment
Test
Site
Distribution
Design
Survey
ReportSubmission
Site Survey
Network Plan
Simulation
PN and
NeighborPlanning
Wireless Plan
Report
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PN and Neighbor Plan
Allocate PN offset
index to different cells.Determine available
PN and reserve PN
Determine neighborsfor each cell
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Wireless Plan Report
Pre-research
of Project
Requirement
Analysis
Survey of
Provided
Sites
Reduce
Process
Network
Evaluation
Wireless
Environment
Test
Site
Distribution
Design
Survey
ReportSubmission
Site Survey
Network Plan
Simulation
PN and
NeighborPlanning
Wireless Plan
Report
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Wireless Plan Report
Wireless network planning and design offerinformation for the following stage, construction
of the project.
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Thank You!
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