atoll lte features - st3...
TRANSCRIPT
ATOLL LTE FEATURES
Training Programme
1. LTE Planning Overview
2. Modelling a LTE Network
3. LTE Predictions
4. Frequency and PCI Plan Analysis
5. Monte-Carlo Based Simulations
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1. LTE Planning Overview
LTE Features Supported in Atoll
LTE Workflow in Atoll
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LTE Features supported in Atoll
Supports Evolved UTRA (3GPP Release 8 LTE) NetworksVarious Frequency Bands
Scalable Channel Bandwidths
Resource Blocks per Channel and Sampling Frequencies
Support of TDD and FDD Frame Structures
Half-frame/Full-frame Switching Point Periodicities for TDD
Normal and Extended Cyclic Prefixes
Downlink and Uplink Control Channels and Overheads• Downlink and uplink reference signals, PSS, SSS, PBCH, PDCCH, PUCCH, etc.
RSRP, RSSI and RSRQ Support in predictions and Simulations
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LTE Features supported in Atoll
Supports Evolved UTRA (3GPP Release 8 LTE) NetworksPhysical Cell IDs Implementation
Inter-Cell Interference Coordination Support• Fractional Frequency Reuse Modelling
Support of Fractional Power Control (UL)
Support of Directional CPE Antennas
Signal Level Based Coverage Planning
CINR Based Coverage Planning
Possibility of Fixed Subscriber Database for Fixed Applications
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Specific Module
LTE Features supported in Atoll
Supports Evolved UTRA (3GPP Release 8 LTE) NetworksNetwork Capacity Analysis using Monte Carlo Simulations
Scheduling and Resource Allocation in Two-dimensional Frames
Multiple Input Multiple Output (MIMO) Systems• Transmit and Receive Diversity• Single-User MIMO or spatial multiplexing • Adaptive MIMO Switch (AMS)• Modelling of Multi-User MIMO (collaborative MIMO – UL only)
Tools for Resource Allocation• Automatic Allocation of Neighbours• Automatic Allocation of Physical Cell IDs• Automatic Allocation of Frequencies (AFP)
Network Verification Possible using Drive Test Data
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Slide 7 of 82
LTE Workflow in Atoll
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Open an existing project or create a new one
Prediction Study Reports
Traffic Maps
Network Configuration- Add network elements- Change parameters
User-defined Values
Automatic or Manual Neighbour Allocation
Basic Predictions(Best Server, Signal Level)
Monte-Carlo Simulations
Signal Quality and Throughput Predictions
Cell Load ConditionsSubscriber Lists
And/or
Frequency Plan Analysis
Automatic or Manual Frequency Planning
Automatic or Manual Physical Cell ID Planning
ACP
Training Programme
1. LTE Planning Overview
2. Modelling a LTE Network
3. LTE Predictions
4. Frequency and PCI Plan Analysis
5. Monte-Carlo Based Simulations
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2. Modelling a LTE Network
Global Settings
Frequency Band definition
Frame Structure Settings
Radio Parameters
Site
Transmitters
Cells
Equipment Parameters
User-definable reception characteristics
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Global Settings (1/2)
Frequency BandsAtoll can model multi-band networks within the same document
TDD (Time Division Duplexing) or FDD (Frequency Division Duplexing)
One frequency band assigned to each cell
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LTE Frame Structure definition
System-level constants (Hard-coded)• Width of a resource block (180 kHz)• Frame duration (10 ms)
Other control channel overheads defined by 3GPP (calculated based on 3GPP specs)• Reference signals, PSS, SSS, PBCH, etc.
Global Settings (2/2)
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TDD option only : Switch from DL to UL
every half frame (default) or every
frame
Number of SD for PDCCH (0,1,2 or 3) carrying DL and UL Resource allocation
information
Normal (default) or extended cyclic prefix (No. of SD per slot) e.g.: at 15 kHz, 7 SD/slot
(normal) or 6 SD/slot (extended)
Average number of resource blocks for
PUCCH
Radio Parameters Overview
SiteX (longitude) and Y (latitude)
TransmittersActivityAntenna configuration (model, height, azimuth, mechanical & electrical tilts...) UL & DL Losses / UL Noise FigurePropagation (Model, Radius and resolution)
CellsFrequency Band & ChannelPCIPower definitionMin RSRPUL & DL LoadDiversity SupportNeighbours
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Presented in General Features
Transmitter Parameters
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Propagation settings Antenna Configuration and Lossesparameters
Cells parameters(see next slide)
Antenna Configuration
DL and UL total losses,
UL noise figure
Cell Parameters
Inputs of the neighbour allocation algorithm
Neighbour list
Cell activity
Power and energy offsets from computed
reference signal
Cell’s frequency band
Channel number in the frequency band (and
allocation status)
DL traffic load
Physical Cell ID + resulting PSS/SSS (and allocation status)
MIMO Configuration
Min RSRP used as cell coverage limit
UL noise rise due to surrounding mobiles
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ICIC and Fractional Power Control Parameters
(Advanced)
Load Conditions
Equipment Parameters (1/2)
Bearers (Modulation and Coding Schemes) definitionUser-definable bearer efficiencies(useful bits per resource element)
Bearer selection thresholds for link adaptationQuality indicator graphs
BLER used to model the effect of errors in data reception
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Equipment Parameters (2/2)
Multiple Input Multiple Output SystemsDiversity and SU-MIMO gains
• Definable per bearer and antenna configuration• Depend on the clutter class where users are located
MU-MIMO gain• Definable per cell or• Calculated during Monte Carlo simulations using intelligent multi-user scheduling on two antenna ports
(Layered Space-time Scheduling)
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Training Programme
1. LTE Planning Overview
2. Modelling a LTE Network
3. LTE Predictions
4. Frequency and PCI Plan Analysis
5. Monte-Carlo Based Simulations
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3. LTE Predictions
Introduction
Parameters used in Predictions
Prediction Settings
Fast Link Adaptation Modelling
Coverage Prediction Examples
Point Analysis Studies
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Introduction
Coverage PredictionsGeneral Studies based on Downlink Reference Signal Levels
• Best server plot based on downlink reference signal levels• Multiple server coverage based on downlink reference signal levels• Reference signal level plots• Reference signal CNR plots• RSRP (Average Reference Signal Level Received Power per Subcarrier) plots
LTE UL and DL Specific Studies• SS, PDSCH, PBCH, PDCCH and PUSCH/PUCCH Signal Level Plots• SS, PDSCH, PBCH, PDCCH and PUSCH/PUCCH CNR Plots• Quality Studies (RSSI – Received Signal Strength Indicator, RSRQ – Reference Signal Received Quality,
Reference Signal, SS, PDSCH, PBCH, PDCCH and PUSCH/PUCCH CINR and interference plots, UL Allocated Bandwidth, UL Transmission Power)
• Best Bearer and Modulation Plots based on PDSCH and PUSCH CINR Levels• Throughput and Cell Capacity per pixel plots based on PDSCH and PUSCH CINR levels
• Peak RLC, Effective RLC, and Application Channel Throughputs• Peak RLC, Effective RLC, and Application Throughputs averaged per User• Peak RLC, Effective RLC, and Application Cell Capacities• Peak RLC, Effective RLC, and Application Aggregate Cell Throughputs• Peak RLC, Effective RLC, and Application Allocated Bandwidth Throughputs (UL)
Point Predictions© Forsk 2011 Slide 19 of 82Confidential – Do not share without prior permission
Introduction
Principles of the studies based on traffic
Study calculated for
• Given load conditions• UL noise rise• DL traffic load
• A non-interfering user with• A service• A mobility• A terminal type (in case of a directive antenna , it is oriented towards the serving cell)
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Load Conditions
Load conditions are defined in the cells table
Values taken into consideration in predictions for each cell
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Service Properties
Parameters used in predictionsHighest bearers in UL and DLBody lossApplication throughput parameters
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Mobility Properties
Parameters used in PredictionsMapping between mobilities and thresholds in bearer and quality indicator determination (as radio conditions depend on user speed).
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Terminal Properties
Parameters used in PredictionsMinimum & Maximum terminal powerGain and lossesNoise figureAntenna settings (incl. MIMO support)
Number of Antenna ports in UL and DL in case of MIMO
support
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Support of MIMO
Min & Max Power +
Noise Figure + Losses
Prediction Settings
Coverage Prediction Plots
Standard predictions• Best server plot
• Coverage by signal level
• Multiple server coverage
Reference signal, SS, PDSCH, PBCH, PDCCH and PUSCH/PUCCH signal level and quality predictions
• Selection of a mobility, a service, a terminal (possibly directional antenna oriented towards the serving cell)
• Reference signal, SS, PDSCH, PBCH, PDCCH and PUSCH CNR plots
• RSRP (Average Reference Signal Level Received Power per Subcarrier) plots
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Prediction Settings
Coverage Prediction Plots
CINR, Throughput and Quality Indicator predictions• Based on user-defined cell loads or on Monte-Carlo simulation results
• Selection of a mobility, a service, a terminal (possibly directional antenna oriented towards the serving cell)
• RSSI – Received Signal Strength Indicator and RSRQ – Reference Signal Received Quality
• Reference Signal, SS, PDSCH, PBCH, PDCCH and PUSCH/PUCCH CINR and interference plots
• UL Allocated Bandwidth, UL Transmission Power)
• Best bearer plots based on PDSCH and PUSCH CINR levels
• Throughput and cell capacity per pixel plots based on PDSCH and PUSCH CINR levels• Peak RLC, effective RLC, and application channel throughputs• Peak RLC, effective RLC, and application throughputs averaged per user• Peak RLC, effective RLC, and application cell capacities• Peak RLC, effective RLC, and application aggregate cell throughputs
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Fast Link Adaptation Modelling
Atoll determines, on each pixel, the highest bearer that each user can obtainNo soft handoverConnection to the best server in term of reference signal level (C)Bearer chosen according to the radio conditions (PDSCH and PUSCH CINR levels)
Process : prediction done via look-up tables
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Best Server Area determination (min RSRP)
Radio Conditions estimation(PDSCH and PUSCH CINR
calculation)
Throughput&
Quality Indicator (BER and BLER)predictions
Reference Signal Level (C)evaluation
Bearer Selection
Interference Estimation
Atoll calculates PDSCH and PUSCH CINR according to:The victim traffic (PUSCH or PDSCH) power
The interfering signals impacted by:• The interferers powers• The path loss from the interferers to the victim• Antenna gain• Losses from interferers (incl. Shadowing effect and indoor losses)
The interference reduction factor applied to interfering base stations transmitting on adjacent channels (adjacent channel suppression factor)
The interference reduction factor due to interfering base stations’ traffic load
The interference reduction due to Fractional Frequency Reuse (and consequently the mutual overlap between the channel fractions of the victim and the interfering base stations)
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Prediction Examples (General Studies)
Coverage by signal level(Based on reference signal power)
Number of servers(Based on reference signal power)
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Prediction Examples (Dedicated Studies)
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Coverage by PDSCH CINR(Isotropic receiver antenna)
Coverage by PDSCH CINR(Directional receiver antenna)
Prediction Examples (Dedicated Studies)
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Coverage by PUSCH CINR(Isotropic receiver antenna)
Coverage by PUSCH CINR(Directional receiver antenna)
Radio Reception Diagnosis at a Given Point : Reception Analysis
Point Analysis Tool: Reception
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Choice of UL&DL load conditions : if (Cells Table) is selected Analysis based on DL load and UL noise rise from cells table
Definition of a user-definable “probe"
receiver, indoor or notCell bar graphs (best
server at the top)
Analysis detail on reference signals,
PDSCH and PUSCH
Reference Signals,
PDSCH and PUSCH
availability (or not)
Selection of the value to be displayed (RS, SS, PDSCH,
RSRP)
Radio Interference Diagnosis at a Given Point : Interference Analysis
Point Analysis Tool: Interference
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Choice of UL&DL load conditions : if (Cells Table) is selected Analysis based on
DL load and UL noise rise from cells table
Definition of a user-definable “probe"
receiver, indoor or not
Selection of the value to be displayed (RS, SS, PDSCH, RSRP)
Serving Cell(C)
Total Level of Interference
(I + N)
List of Interfering Cells
Training Programme
1. LTE Planning Overview
2. Modelling a LTE Network
3. LTE Predictions
4. Frequency and PCI Plan Analysis
5. Monte-Carlo Based Simulations
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4. Frequency Plan Analysis
Channel and Physical Cell ID Search Tools
Physical Cell ID Allocation Audit
Physical Cell ID Histograms
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Search Tool Overview
Tool to visualise channel and PSS ID reuse on the map
Possibility to find cells which are assigned a given :• Frequency band + channel• Physical Cell ID • PSS ID• SSS ID
Way to use this tool
Create and calculate a coverage by transmitter with a colour display by transmitter
Open the “Find on Map” tool available in the Edit menu (or directly in the toolbar )
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Channel Search Tool
Channel Reuse on the Map
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Colours given to transmitters• Red: co-channel transmitters
• Yellow: multi-adjacent channel (-1 and +1) transmitters• Green: adjacent channel (-1) transmitters• Blue: adjacent channel (+1) transmitters
• Grey thin line: other transmitters
Frequency band andChannel number
Resource Selection
Physical Cell ID, PSS ID and SSS ID Reuse on the Map
Physical Cell ID Search Tool
Colours given to transmitters• Red or Grey thin line: if the transmitters carries or not the specified resource value (Physical Cell ID, PSS ID
or SSS ID)
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Resource Type and
Value
Resource Selection
PCI Allocation Audit (1/2)
Verification of the allocation inconsistenciesRespect of a minimum reuse distanceRespect of neighbourhood constraints (two neighbour cells must have different PCI)Respect of SSS ID allocation strategy
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PCI Allocation Audit (2/2)
Audit resultsInconsistencies are displayed in the default text editor
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The minimum distance constraint is fulfilled
Cells BRU010_L1 & BRU116_L2 are Neighbour cells but have been allocated
the same PCI
These 13 sites do not fulfil the SSS ID allocation strategy:
on each site, allocated PCI do not have the same SSS ID
Physical Cell ID Histograms
View of the Physical Cell ID Distribution
Dynamic pointer
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Training Programme
1. LTE Planning Overview
2. Modelling a LTE Network
3. LTE Predictions
4. Frequency and PCI Plan Analysis
5. Monte-Carlo Based Simulations
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5. Monte-Carlo Based Simulations
Traffic modelling
Monte Carlo Simulations
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44
Traffic Modelling (1/2)
Traffic DataTraffic maps and subscriber lists
Various types of traffic maps:• Raster traffic maps• Vector traffic maps• Live traffic maps• Traffic density maps
Live Traffic Data
Vector Traffic Data
Raster Traffic Data
Subscribers
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Traffic Modelling (2/2)
Subscriber ListsLists of subscribers with fixed locations and specific parameters
Can be created using the mouse or imported from txt and csv files
Can be displayed on the map according to different parameters
Main parameters:• Location: X and Y coordinates• Antenna height• Azimuth and tilt (user-defined or calculated)• Serving cell (user-defined or calculated)• User profile• Terminal type
Prediction calculations can be carried outon subscribers (points)
• Predicted results include reception levels,CINR, throughputs, etc.
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Monte Carlo Simulations (1/3)
Monte Carlo SimulationsFor studying network capacity
Network behaviour under given traffic
Can be based on traffic data from traffic mapsand subscriber lists
Distribution of mobile users and services
Calculation of user parameters (CINR, power control,noise rise, resource allocation, etc.)
Scheduling and radio resource allocationbased on service priorities and scheduling methods:
• Proportional Fair• Proportional Demand• Max Aggregate Throughput
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Monte Carlo Simulations (2/3)
Simulation ResultsFor each cell
• UL and DL traffic loads• UL noise rise• UL and DL aggregate cell throughputs• Traffic input and connection statistics• …
For each mobile• Serving transmitter and cell• Azimuth and tilt (towards the serving cell)• Reference signal, SCH/PBCH, PDSCH, and PUSCH signal levels• Reference signal, SCH/PBCH, PDSCH, and PUSCH CINR and interference levels• Best bearers based on PDSCH and PUSCH CINR levels• Cell throughputs, cell capacities, and user throughputs PDSCH and PUSCH CINR levels• Connection status and rejection cause• …
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Monte Carlo Simulations (3/3)
Simulation Results Display
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