LTE RF System Design Procedure

Supplement Atoll v2.8.1 features for LTE and WiMAX RF System Design Procedure

Supplement - Atoll v2.8.1 features for LTE and WiMAX RF System Design Procedure Revision 1.1Atoll Version 2.8.1Services Research and Development

iProtect: Internal Copyright 2010 Motorola, Inc. All Rights Reserved

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Table of Contents

81.Introduction

81.1.Supplement Purpose

91.2.New Atoll v2.8.1 Features

102.Managing Station Templates Channel Assignments

102.1.Explorer Window

112.2.Tool Bar

143.Coverage by Uplink Transmission Power

174.Physical Cell ID Allocation

174.1.Allocating Physical Cell IDs

174.1.1.Automatic Allocation

224.1.2.Manual Allocation

234.2.Verifying Physical Cell ID Allocations

254.3.Displaying Physical Cell ID Allocations

254.3.1.Search Tool

274.3.2.Transmitter Display Settings

294.3.3.Physical Cell ID Histogram

325.ICIC Inter-Cell Interference Coordination

325.1.ICIC Cell Properties

325.1.1.Individual Cell Properties

355.1.2.Cell Properties Table

376.Fractional UL Power Control

386.1.Fractional Uplink Power Control Cell Properties

386.1.1.Individual Cell Properties

406.1.2.Cell Properties Table

427.References

438.Glossary

List of Tables

Error! No table of figures entries found.List of Figures

10Figure 1: Accessing Station Templates through the Explorer Window

11Figure 2: Updating the Channels within Station Templates

12Figure 3: Accessing Station Templates through the Tool Bar

14Figure 4: Determining the Maximum Power CPE Parameters

15Figure 5: Coverage Image Properties Window

16Figure 6: Transmission Power (UL) Image

18Figure 7: Neighbours

19Figure 8: Automatic Neighbour Allocation

20Figure 9: Physical Cell IDs

21Figure 10: Automatic Physical Cell Identification Number Assignment

22Figure 11: Cell Properties

23Figure 12: Cell Properties

24Figure 13: Physical Cell IDs

24Figure 14: Physical Cell ID Audit

25Figure 15: Physical Cell ID Audit Report

26Figure 16: Search Tool

26Figure 17: Search Tool Window

27Figure 18: Search Results

27Figure 19: Transmitter Properties

28Figure 20: Display Tab

28Figure 21: Field Selection

29Figure 22: Tip Text

30Figure 23: Physical Cell IDs

31Figure 24: Physical Cell Identification Number Assignment

33Figure 25: Transmitter Properties

33Figure 26: Cells Tab

36Figure 27: Open Cells Table

36Figure 28: Cell Table

38Figure 29: Transmitter Properties

38Figure 30: Cells Tab

40Figure 31: Open Cells Table

41Figure 32: Cell Table

Revision HistoryAtoll ReleaseRevisionDateAuthorDescription

2.8.10.1Dec 18-2009SSEInternal review

2.8.11.0Jan 22 2010SSEFirst Release

2.8.11.1Jan 28 2010SSEMinor error message note.

Document location for LTE: http://compass.mot.com/go/318588510Document location for WiMAX: http://compass.mot.com/go/3169364641. Introduction

1.1. Supplement PurposeThis document contains new features introduced in Atoll version 2.8.1 that may be useful to the processes and procedures of producing LTE and WiMAX RF system designs. The intent of this document is to describe these new features. This document is intended to be used along with the existing LTE and WiMAX design procedures (i.e. the LTE RF System Design Procedure for use with Atoll v1.0 and the WiMAX RF System Design Procedure for use with Atoll v2.8.0). The Graphical User Interface (GUI) for Atoll v2.8.1 has minor changes compared to v2.8.0. Only the GUI changes pertaining to the features presented in this document will be addressed.

These feature descriptions will be incorporated into the primary RF System Design Procedure documents when these documents are updated for the next major Atoll Release, v2.9.0. The GUI changes for Atoll 2.9.0 will be updated in the documentation at that point.

This document describes five new Atoll features that are introduced with the Atoll point release v2.8.1. These features are relevant to LTE and WiMAX. Their inclusion into the RF system design process is not mandatory. They are presented here for use in market designs which need to show the impacts of these particular features.

ATTENTION: An error message Missing table :MUGTables may appear when opening a project that was originally created using Atoll v2.8.0 using Atoll v2.8.1 build 3095. The error relates to an unpopulated MUG table multi-user diversity gain which is only used when the Proportional Fair scheduler is selected for Monte Carlo simulations. This error will have no impact no the static modeling conducted in this supplement and can be ignored.All five features apply to LTE, while only two applies to WiMAX, as described below.1.2. New Atoll v2.8.1 Features1. Managing Station Templates Channel Assignments - Enables the assignment of channels to sectors within the station templates. These assignments are then present when the template is used to create a new site. This feature eliminates the need to edit each newly added transmitter for the purpose of defining the associated channel number. (This feature is applicable to both WiMAX and LTE). See Section 2.2. Coverage by Uplink Transmission Power This new coverage image shows the uplink performance based on the power required from a given subscriber unit on the uplink. The Uplink Transmission Power image can assist in locating coverage problem areas where the power required from the CPE exceeds the CPE capabilities. (This feature is applicable to both WiMAX and LTE). See Section 3.3. Physical Cell ID Allocation Assigning physical cell identification numbers to the cells is necessary in order to utilize the ICIC feature. The process of making the assignments is therefore presented in this supplement. See Section 4.4. ICIC Inter-Cell Interference Coordination This feature will be available in the Motorola LTE product line. It is a feature used to reduce the interference experienced by adjacent sectors and sites. Modeling ICIC using Atoll is presented in this supplement. See Section 5.5. Fractional UL Power Control This feature will be available in the Motorola LTE product line. It is a feature used to manage the subscriber transmitted uplink spectral density to achieve a balance between the maximum uplink data rate for an individual subscriber and the overall cell throughput. Modeling fractional power control using Atoll is presented in this supplement. See Section 6.The following sections describe these five Atoll v2.8.1 features.2. Managing Station Templates Channel Assignments

The ability to assign unique channels for each sector / cell of a base station within the base station template has been added in Atoll v2.8.1. This feature applies to both LTE and WiMAX. This feature eliminates the need to edit each newly added transmitter for the purpose of defining the associated channel number. For general information on editing a station template, refer to Section 5.2.8 in either the LTE RF System Design Procedure for use with Atoll or the WiMAX RF System Design Procedure for use with Atoll.Two methods exist for making the channel assignments to the station template. One method is accessed through the Explorer window. The second method is accessed through the tool bar.2.1. Explorer WindowOne method of accessing the station template channel assignment feature is through the Explorer window. Under the Data tab within the explorer window, right click on Transmitters. This opens the transmitters menu. Move the cursor down to Network Settings and then over to Station Templates (See the following figure). Figure 1: Accessing Station Templates through the Explorer Window

Clicking on Station Templates opens the Station Template window (See the following figure).Figure 2: Updating the Channels within Station Templates

Channel numbers for each sector of a station template definition can be assigned in the Channels column. The channel numbers must be separated by semi-colons (;) without any spaces. (See the figure above). The channels need to be entered into the Channels column in the order that they will be assigned to the sectors. For example, based on the figure above, the first sector of a 2x2 RRH site would be assigned channel 0, the second sector would be assigned channel 1 and the third sector would be assigned channel 2. The previous figure is for an LTE project. A similar window would exist for WiMAX though the headings will not be the same for all of the columns, but the Channels column would be modified the same way. Close this window when the assignments have been completed.2.2. Tool Bar

A second method of accessing the station template channel assignment feature is through the Tool Bar at the top of the Atoll window. Pull down the template selection bar and select Manage Templates at the bottom of the list. This opens the Station Template Properties window (See the following figure). Select a station configuration from the Available Templates and click on the Properties button. Figure 3: Accessing Station Templates through the Tool Bar

This opens the properties window for the selected station configuration. Click on the technology tab (WiMAX or LTE) at the top of this window. Click on the Cell Definition per Sector button. This opens the Cell Definition per Sector window. Pull down the sector selection bar and select a sector. Place the cursor in the Channels box and enter the desired channel number to assign to the selected sector. Repeat this for all the sectors in the site. Click OK when the assignments are completed. Then click OK on the previous windows to complete the updates to the template. The previous figure portrays GUI windows for an LTE project. Similar windows would exist for WiMAX, though some of the field names will differ, but the same approach is used to get to the Cell Definition per Sector window in order to specify the WiMAX channel numbers.3. Coverage by Uplink Transmission PowerThe Coverage by uplink transmission power image is applicable for both LTE and WiMAX. It is an additional design image (see Section 9.3.2 in both the LTE RF System Design Procedure for use with Atoll and the WiMAX RF System Design Procedure for use with Atoll) that can be helpful in the system design process by providing an additional perspective on the system design. The coverage by C/(I+N) (UL) image can display the uplink transmission power used to achieve the highest possible CPE MCS based on C/(I+N) and bearer calculations for each pixel. (See Section 9.3.1.1 of either RF System Design Procedure document for a complete description of producing a C/(I+N) (UL) coverage image.) The Uplink Transmission Power image can assist in locating coverage problem areas where the power required from the CPE exceeds the CPE capabilities.The maximum available transmit power for the CPE must be used to properly display the image. This maximum power level can be found in the Atoll Explorer window under the Data tab by accessing the properties for a given terminal:

(for LTE) ( LTE Parameters > Terminals > (CPE name) (for WiMAX) ( WiMAX 802.16e Parameters > Terminals > (CPE name)

Right click on the desired CPE name to open the CPE Parameters window and determine the maximum and minimum power levels associated with this CPE (See the following figure).

Figure 4: Determining the Maximum Power CPE Parameters

The coverage by uplink transmission power image is created by selecting Transmission Power (UL) (dBm) when generating a Coverage by C/(I+N) Level (UL) coverage image. This image is created by first right clicking Predictions in the Atoll Explorer window under the Data tab. Select New to open the Study Types window. Select Coverage by C/(I+N) Level (UL) and click OK. The properties window for the coverage image will open (see the following figure):Figure 5: Coverage Image Properties Window

Select the Display tab and pull down the items in the Field box and select Transmission Power (UL) (dBm). Pull down the items under the Actions button and click on shading. In the Shading window, set the value intervals to cover a range from the maximum CPE power (for the given CPE terminal specified in the Conditions tab) down to the minimum CPE power. It is also recommend going to the General tab and renaming the prediction to a more meaningful description, i.e. TxPwrUL.Calculate the prediction once these settings have been made to produce an image similar to the figure shown below:

Figure 6: Transmission Power (UL) Image

The white areas (as seen in the upper left region of the previous figure) represent locations where the CPE had insufficient transmit power to meet its lowest target MCS (i.e. the power level required to meet the lowest MCS exceeded the power capabilities of the CPE).4. Physical Cell ID Allocation

The Atoll v2.8.1 physical cell ID allocation feature is used when assigning cell identification numbers to LTE sectors (cells). This feature is not applicable to WiMAX. The cell identification numbers are used by certain LTE functions such as ICIC (Inter Cell Interference Cancelation) / FFR (Fractional Frequency Reuse) (see Section 5 below). Cell ID numbers must be assigned to each cell before the Atoll ICIC / FFR feature can be used.

Physical cell identifications are associated with LTE systems and do not apply to WiMAX. LTE supports are 504 unique physical cell identities (0 through 503). Each cells reference signal transmits a pseudo-random sequence corresponding to the physical cell ID of the cell.Physical cell identifications can be assigned manually though the available automated process would produce assignments faster. The flow of actions to produce automated physical cell identification assignments would be:

1. Automatically generate a neighbor list for the cells. The neighbor list is used by the automated physical cell identification number routine as a condition for assigning the physical cell identification numbers and results in fewer assignment result conflicts.

2. Run the automatic physical cell identification number allocation routine.

3. Verify the physical cell identification number assignments produced by the automated routine.

4. Manually enter any corrections needed as highlighted in the verification step.

4.1. Allocating Physical Cell IDsAtoll offers two approaches to assigning physical cell IDs. An Automated Allocation function generates the ID numbers for all the cells within the system at one time using an algorithm that seeks to keep adjacent and neighboring cells from being assigned the same physical cell ID numbers. A Manual Allocation mode allows the user to enter physical cell ID numbers one cell at a time.4.1.1. Automatic Allocation

The automated process of generating physical cell identification number assignments functions on conditions selected by the user.4.1.1.1. Automatic Neighbor List Generation

One condition which significantly impacts the validity of the physical cell identification number assignment results is the use of a cell neighbor list as a condition within the automatic cell identification number assignment routine. To automatically generate a cell neighbor list for this purpose requires the following steps:In the Explorer window, select the Data tab and right click on Transmitters. This opens the transmitters menu. Move the cursor down to Cells, then over to Neighbors and click on Automatic Allocation (See the following figure).

Figure 7: Neighbours

This opens up the Automatic Neighbor Allocation window (See the following figure).

Figure 8: Automatic Neighbour Allocation

Select a value for the Max Inter-site Distance that is far enough to span the distance from any randomly chosen site to two sites away. The following boxes should be checked,

Force co-site cells as neighbors

Force adjacent cells as neighbors

Delete existing neighbors

The default settings of Max No. of Neighbors as 16 and % Min Covered Area as 10% are sufficient for purpose of generating a neighbor list to be used by the automated physical cell identification number assignments routine.Click Calculate to generate the neighbor list. Click Commit to make it accessible by the automated physical cell identification number assignments routine and click the Close button to close the window.4.1.1.2. Automatic Physical Cell Identification Number Assignment

Use the following steps to automatically generate the physical cell identification number assignments:In the Explorer window, select the Data tab and right click on Transmitters. This opens the transmitters menu. Move the cursor down to Cells, then over to Physical Cell IDs and click on Automatic Allocation (See the following figure).

Figure 9: Physical Cell IDs

This opens up the Physical Cell ID Allocation window (See the following figure).

Figure 10: Automatic Physical Cell Identification Number Assignment

Within the Relations area, check the Neighbors and Min Reuse Distance boxes. Enter the distance value used in Section 4.1.1.1. Within the SSS ID Allocation Strategy area, select free (this allows every cell within a site to have a unique ID number).Click the Calculate button to generate the physical cell identification number assignments. Click Commit to make the ID number assignments accessible by other Atoll features (such as ICIC) and click the Close button to close the window.4.1.2. Manual Allocation

The physical cell identification number assignments can be made manually by using the following steps:Right click on a cell marker within the map window and select the cell Properties item in the menu (See the following figure).Figure 11: Cell Properties

This opens the Properties window. Select the Cells tab and enter the desired physical cell identification number in the table indicated with the red in the following figure.

Figure 12: Cell Properties

Click the OK button to finalize the assignment.The manual allocation can also be accomplished editing the Cells table. To open the Cells Table, right-click on the Transmitters folder and select Cells > Open Table4.2. Verifying Physical Cell ID AllocationsUse the following steps to audit the physical cell identification number assignments:

In the Explorer window, select the Data tab and right click on Transmitters. This opens the transmitters menu. Move the cursor down to Cells, then over to Physical Cell IDs and click on Audit (See the following figure).

Figure 13: Physical Cell IDs

This opens up the Physical Cell ID Audit window (See the following figure).

Figure 14: Physical Cell ID Audit

Within the conditions area, check the Distance and Neighbors boxes. Enter the distance value used in Section 4.1.1.1.

Click OK button to generate the physical cell identification number assignment audit report (See the following figure).Figure 15: Physical Cell ID Audit Report

Review the results presented in the report. The user my take advantage of the cell ID display features described below in Section 4.3 to determine the need to manually alter any cell ID assignments (see Section 4.1.2).

4.3. Displaying Physical Cell ID Allocations

Displaying the physical cell identification number assignments can assist the user in identifying duplicate assignments which may cause problems due to their proximity. Three methods of displaying the physical cell IDs are given below:

4.3.1. Search Tool

Click on View within the Tool Bar at the top of the Atoll window. Select Search Tool (See the following figure).

Figure 16: Search Tool

This opens the Search Tool window (See the following figure).Figure 17: Search Tool Window

Click on the Physical Cell ID tab at the bottom of the window. Select the Physical Cell ID: option and enter a physical cell ID number in the box to the right of the selection button. Click the Search button. The main map will show only the cells that match the selected physical cell ID number selected. The up down arrows next to the physical cell ID number in the Search Tool window can be used to quickly index through all the assigned physical cell IDs in the system for display (See the following figure which shows Site 3 sector 1 and Site 5 sector 2 having the same Physical Cell ID).Figure 18: Search Results

Click on the Reset Display button in the Search Tool window to return to the normal view of the sites.

4.3.2. Transmitter Display Settings

Physical Cell IDs can also be displayed by changing the transmitter display settings on the map window. In the Explorer window, select the Data tab and right click on Transmitters. This opens the transmitters menu. Select Properties (See the following figure).

Figure 19: Transmitter Properties

Select the Display tab at the top of the Transmitters Properties window (See the following figure).Figure 20: Display Tab

Pull down the Display Type: options and select Discrete values. Pull down the Fields: options and select Cells-Physical Cell ID. Click the button next the Tip Text box to open the Field Selection window (See the following figure).Figure 21: Field Selection

Scroll down within the Available Fields window to the Cell portion and select Cells-Physical Cell ID. Click the >> button to add it to the Selected Fields window. Click OK to close the Fields Selection window. Click OK at the bottom of the Transmitters Properties window. The cell markers will now display colours associated with the physical cell ID numbers and the tip text will now include the physical cell ID number when the cursor is placed on a cell (See the following figure).Figure 22: Tip Text

4.3.3. Physical Cell ID Histogram

Atoll can produce a Histogram that shows the distribution of assigned physical cell ID numbers within the system. This can give the user an indication of which ID numbers are frequently reused. Use the following steps to produce this histogram:

In the Explorer window, select the Data tab and right click on Transmitters. This opens the transmitters menu. Move the cursor down to Cells, then over to Physical Cell IDs and click on Physical Cell ID Distribution (See the following figure).

Figure 23: Physical Cell IDs

This opens up the Distribution Histogram window (See the following figure).

Figure 24: Physical Cell Identification Number Assignment

The user can scroll the Detailed Results data window to see the number of times each physical cell ID was assigned within the system. 5. ICIC Inter-Cell Interference CoordinationInter-Cell Interference Coordination (ICIC) is a method used in LTE systems to improve the signal quality at cell edges of cell coverage. The current product implementation supports down link ICIC and not up link ICIC. Down link ICIC will be addressed in this section. This feature is not applicable to WiMAX. ICIC is accomplished by subdividing the allocation of resource blocks of the surrounding potentially mutually interfering cells. The co-channel cells throughout the system assign resource blocks to subscribers based on an interleaved schedule of 1/3rd of the available blocks within the frame. The blocks are allocated starting with the lowest block assignment number first, increasing until all the blocks are consumed. If the traffic exceeds this 1/3rd allotment, the additional traffic is assigned to the other 2/3rds allotments assigned to the neighboring co-channel cells starting with the highest block numbers first. This process avoids co-block traffic assignment for as long as possible. This process helps limit the interference energy experienced by the subscriber terminal. Once the cells are loaded to their full capacity, the resource blocks are fully used and cell edge performance improvements afforded by ICIC can not be realized.

Static Fractional Frequency Reuse (FFR) coordination is the method used by Atoll to model ICIC for the signal down link. Fractions of a channel bandwidth are allocated to different sectors to represent traffic utilizing ICIC. The user enters cell parameters for each cell which define the percentage of the down link signal using ICIC.

No unique output is generated as a result of using ICIC. An improvement in the existing output results should be evidenced in lightly loaded systems experiencing cell edge interference problems.5.1. ICIC Cell PropertiesEach cell that is going to utilize ICIC must have associated parameters set by the user. The parameters are accessed through the properties window for the cell.5.1.1. Individual Cell PropertiesIn the Explorer window, select the Data tab and expand the Transmitters list by clicking on the [+] sign. Right click on the desired transmitter and select Properties (See the following figure). Figure 25: Transmitter Properties

This opens the Properties window. Select the Cells tab to access the ICIC parameters (See the following figure).

Figure 26: Cells Tab

NOTES:

1. Interference Coordination Support - Atoll currently supports static ICIC modeling of the down link. To select this option, click on the right end of the parameter box to open the following pull down menu:

Check the Static DL box to activate ICIC for the cell.

2. ICIC Ratio (DL) (%) The user enters the percentage of the cells down link traffic that will be utilizing ICIC. Cells with Traffic Load (DL) (%) = 33 would have an ICIC Ratio (DL) (%) = 100. Cells with Traffic Load (DL) (%) = 100 would have an ICIC Ratio (DL) (%) = 0.

This value is dependant on the how heavily loaded the cell.The higher the overall cell traffic load, the lower this ICIC ratio will be.

3. ICIC Delta Path Loss Threshold (dB) This value represents the maximum difference in pathloss (and relative signal strength) between the best serving cell and the interfering cells (value in dB). If the interfering cells have path loss value for a given map location which is greater than this threshold, the ICIC feature will not be used while predicting performance for the location.

The current Motorola implementation of ICIC does not discriminate which subscribers will be given ICIC based on measured signal performance. To correctly model ICIC for Motorola products, this parameter is set very high (30 dB) allowing all map locations to use ICIC.

5.1.2. Cell Properties TableThe ICIC parameters for all of the cells can be edited at the same time through the Cell table. In the Explorer window, select the Data tab and right click on Transmitters. This opens the transmitters menu. Move the cursor down to Cells, then over to Open Table (See the following figure).

Figure 27: Open Cells Table

This opens the Cells table from which the ICIC parameters described in Section 5.1.1 can be entered for all cells in the system (See the following figure).Figure 28: Cell Table

6. Fractional UL Power ControlFractional Uplink Power Control (FPC) is a method used in LTE systems to achieve a balance in sector performance between maximum overall sector throughput and subscriber cell edge throughput. This feature is not applicable for WiMAX.Maximum overall sector throughput is achieved when subscribers are allowed to transmit using their maximum power at all times. This power control method corresponds to the operating variable =0 (see Section 6.1.1 Note 1). Subscribers close to the site achieve high MCS levels at the expense of increased noise rise, which limits the performance of subscribers at the edges of the cell coverage.

Maximum subscriber cell edge throughput is achieved when the power transmitted by all subscribers is reduced to the minimum required to achieve their target MCS. This power control method corresponds to the operating variable =1 (see Section 6.1.1 Note 1). This method manages the noise rise on the up link enabling subscribers at the edges of the cell coverage better throughputs at the expense of lowering the overall sector throughput.Using fractional power control allows the subscribers close to the site to operate at power levels above the minimum power required to achieve their target MCS level but less than the maximum available transmit power. This power control method corresponds to the operating variable being a fractional value between 0 and 1 (see Section 6.1.1 Note 1). Fractional power control may achieve a balance between overall sector throughput and subscriber cell edge throughput.

Fractional Uplink Power Control (FPC), as implemented in Atoll, requires the user to enter two parameters for each cell which define the FPC pathloss reduction factor () and a PUSCH C/(I+N) threshold.There is an optimal PUSCH C/(I+N) threshold value associated with each FPC pathloss reduction factor () value. Prediction results can negatively impacted if the optimal PUSCH C/(I+N) threshold value for a given is not used. LTE hardware implementation parameters allow the setting of , but do not have a corresponding input that relates to the Atoll PUSCH C/(I+N) threshold variable. The LTE system dynamically adjusts the PO_PUSCH for each cell to achieve the best operating point for a given and noise environment. The relationship between Atoll input variables and real world implementations is not clearly defined at this time.NOTE: For this reason, it is recommended that fractional power control not be used for contractual system designs. The system designs will be slightly conservative and will correspond to designs generated using earlier versions of Atoll. The user may experiment with Atoll FPC knowing there currently is no process to correlate the Atoll results with Motorola LTE deployments.6.1. Fractional Uplink Power Control Cell Properties

Each cell that is going to utilize FPC must have associated parameters set by the user. The parameters are accessed through the properties window for the cell.6.1.1. Individual Cell Properties

In the Explorer window, select the Data tab and expand the Transmitters list by clicking on the [+] sign. Right click on the desired transmitter and select Properties (See the following figure).

Figure 29: Transmitter Properties

This opens the Properties window. Select the Cells tab to access the FPC parameters (See the following figure).

Figure 30: Cells Tab

NOTES:

1. Fractional Power Control Factor Is a user selected pathloss reduction factor that is applied when determining the required uplink PUSCH power. This factor is represented by (alpha) in 3GPP specifications. This pathloss reduction effectively enables Atoll to select a lower PUSCH power than would otherwise be used to achieve the target CINR. The factor values available run from 0 to 1.

A value of 0 represents no power control with all CPE units transmitting at their maximum power level. This setting maximizes the total sector throughput at the expense of CPE cell edge throughput. A value of 1 represents full power control with all CPE units transmitting at the lowest power level required to reach their target throughput. This setting maximizes the CPE cell edge throughput at the expense of total sector throughput. Fractional values of between 0 and 1 provide compromises between CPE cell edge throughput and total sector throughput.

The default value for the Fractional Power control Factor () is 1. This default value can be used to model a system using no fractional power control (as was the case using Atoll v2.8.0).

2. Max PUSCH C/(I+N) (dB) This value represents the PUSCH C/(I+N) threshold that is used by Atoll to determine the nominal PUSCH power received at the base site. If the power from the CPE at the base site is higher than the indicated nominal PUSCH power, the CPE transmission power is reduced in order to lower the received power to the level of the nominal PUSCH power.

The default value for the Max PUSCH C/(I+N) (dB) parameter is 20 dB. This default value can be used to model a system using no fractional power control (as was the case using Atoll v2.8.0).6.1.2. Cell Properties Table

The FPC parameters for all of the cells can be edited at the same time through the Cell table. In the Explorer window, select the Data tab and right click on Transmitters. This opens the transmitters menu. Move the cursor down to Cells, then over to Open Table (See the following figure).

Figure 31: Open Cells Table

This opens the Cells table from which the FPC parameters described in Section 6.1.1 can be entered for all cells in the system (See the following figure).Figure 32: Cell Table

7. References

TitleLocation/VersionDateAuthor(s)

1.Atoll User Manualhttp://compass.mot.com/go/310612680Feb-2009Forsk

2.Atoll Technical Reference Guidehttp://compass.mot.com/go/310612680Feb-2009Forsk

6.LTE ML-CAThttp://compass.mot.com/go/184756262 Oct-2009RFPD

7.LTE RF Planning Guidehttp://compass.mot.com/go/310442223Oct-2009RFPD

8.LTE ML-CAT User Guidehttp://compass.mot.com/go/310448858Oct-2009RFPD

8. Glossary

AcronymMeaning

AASAdaptive Antenna System

AMSAdaptive MIMO Switching

APENodeB

BEBest Effort

BSBase Site

BSIDBase Station ID

CATPCoverage Acceptance Test Plan

CDFCumulative Distribution Function

CINRCarrier to interference plus noise ratio

CPECustomer Premises Equipment

DAPDiversity ENodeB

DLDownlink

dBDecibel

dBiDecibels relative to an isotropic radiator

EFSEffective Faded Sensitivity

ERPEffective Radiated Power

GAPGround mounted ENodeB

IAPIntelligent ENodeB

KbpsKilobits per second

LOSLine-of-sight

MACMedium Access Control layer

MAPMobile Application Part, Media Access Protocol

MbpsMegabits per second

MCSModulation and Coding Scheme

MIMOMultiple Input Multiple Output

MMSEMinimum Mean Square Error

MPRModulation and coding Product

MbitsMegabits

NLOSNon-line-of-sight

nrtPSNon-Real Time Polling Service

PDUProtocol Data Unit

RTGReceive Transition (or Time) Gap

TXAASmart Antenna ENodeB

SDMASpatial Division Multiple Access

SDUService Data Unit

SMSpatial Multiplexing

SNRSignal to Noise Ratio

SISOSingle Input Single Output

TDDTime Division Duplexing

TMATower Mounted Amplifier

TTGTransmit Transition (or Time) Gap

TxTransmit

TxAA Transmit Adaptive Antenna

ULUplink

VOIPVoice Over Internet Protocol

Area with insufficient power

2

1

3

2

1

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