Psi

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Feature Description

207/221 04-LZA 701 6014/1 Uen B4

Psi-Coverage LTE

Contents Introduction Basic Characteristics Psi-Coverage Summary Additional Information Feature Operation Network Requirements Feature Limitation and Notes PUCCH Overdimensioning and PUSCH Blocking Parameters Feature Configuration Parameters Affected Parameters Parameters Affecting the Feature Network Impact Capacity Coverage Mobility Associated Features and Affected Functions Prerequisite Features Affected Features Related Features Affected System Functions Performance Key Performance Indicators Counters PM Events Feature Activation and Deactivation

1 Introduction This document describes the Psi-Coverage feature and its main benefits and impacts in the LTE RAN. Ericsson proprietary feature Psi-Coverage provides the LTE network operator an excellent solution for low-traffic sites. Compared to the alternative with a traditional three-sector solution, Psi-Coverage efficiently saves OPEX and CAPEX costs without affecting coverage and peak downlink bit rates. At the same time, UL coverage is boosted in an efficient way. After Psi-Coverage for LTE is provided in L15B (FAJ 121 4186), the feature supports Carrier Aggregation (CA) as well, to improve DL peak bit rate (FAJ 121 3046).

http://localhost:9032/alexserv?AC=LINK&ID=1056&FN=207_22104-LZA7016014_... 20/06/2017

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The Psi-Coverage feature also provides UE positioning, non-standard carrier bandwidth with special IBW and Antenna System Monitoring, the latest which is reused to detect disconnect cables or cables with poor connections.

1.1 Basic Characteristics Table 1

Basic Characteristics

Feature name:

Psi-Coverage

Product identity:

Product identity, LTE: FAJ 121 4186

Replaces:

N/A

Dependencies:

See Associated Features and Affected Functions for more information.

Licensing:

Licensed feature. One license required per node.

Feature activation MO:

PsiCoverage

1.2 Psi-Coverage Summary This section describes the benefits of this feature. Benefits of Psi-Coverage: ◾ Feature Psi-Coverage enables accelerated deployment of Mobile Broadband Everywhere and reduces capital expenditure for LTE. This improves profitability of network coverage expansions into areas with fewer subscribers. ◾ It uses one radio to establish an LTE coverage overlay onto a two, or three sectors GSM or WCDMA site grid, with an equivalent coverage. ◾ It leads to lower operating expenditure, since only one radio is used. One radio consumes less energy than three radios. ◾ It provides excellent end-user experience on sites with a low to medium number of subscribers. ◾ It offers other substantial cost savings, which include installation, reduced tower load, and maintenance. ◾ It makes capacity expansion to a standard three-sector site simple, as it reuses already deployed RBS hardware and antennas. ◾ It provides UL coverage equal to that of a standard three-sector configuration. Benefits of Psi-Coverage with Carrier Aggregation (CA): ◾ It Increases downlink speed across the coverage area. ◾ It makes more efficient use of scattered spectrum. ◾ It provides higher cell capacity. ◾ It provides four typical carrier aggregation enabled configurations with PsiCoverage. This gives operators more choices to build high-speed networks compared to standard CA deployment.


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◾ It offers the operator to improve the deployed three-sector or Psi-Coverage network in an efficient way. Benefits of the four carrier aggregation enabled configurations: ◾ Two UL/DL Psi-Coverage cells with separate radio units (CA configuration 1, refer to Manage Psi-Coverage), uses extra radio and TMF(TTMF) to extend a PsiCoverage cell to CA configuration. It provides higher DL peak bit rate and UL/DL traffic capacity. ◾ Single Psi-Coverage cell and single DL cell with separate radio units (CA configuration 2, refer to Manage Psi-Coverage), uses extra radio to extend a Psicoverage cell to CA configuration. It provides higher DL peak bit rate and DL traffic capacity. Compared to CA configuration 1, this configuration boosts downlink peak bit rate and capacity without limitation of TMF (TTMF) and operator spectrum. ◾ Single Psi-Coverage cell and single DL cell with shared radio units (CA configuration 3, refer to Manage Psi-Coverage), extends a Psi-Coverage cell to CA configuration without the need of new hardware. It provides higher DL peak bit rate and DL traffic capacity owing to more efficient use of radio downlink bandwidth resources. ◾ Single Psi-Coverage cell and three-sector configuration (CA configuration 4, refer to Manage Psi-Coverage), provides higher DL peak bit rate. Benefits of Psi solution enhancements: ◾ It uses UE positioning based on PSI cell for both location-based services and improvement of network optimization. ◾ Accuracy of UE position is improved from Cell level to Cell portion level for PSI cell (Baseband Radio Node). ◾ It supports more Radio IBW and carrier bandwidth to utilize spectrum resource efficiently. ◾ It supports more functionalities including: ◾ Symmetric UL and DL BW for the 1.4 MHz carrier bandwidth. ◾ It uses a combination of the features Antenna System Monitoring and VSWR Antenna Supervision to: ◾ Detect disconnected cables. ◾ Detect cables with poor connections causing performance degradation. Benefits of simplified configuration: ◾ It simplifies the configuration of the Psi-Coverage hardware, lowers the complexity of the operation, and contributes to a superior performance. ◾ The operator does not need to create TMF configuration files with the correct version of the external tool Psi Configuration File Generator. ◾ Ericsson does not need to keep the external tool Psi Configuration File Generator updated with support for new frequency bands.


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◾ Less troubleshooting by Ericsson for misconfigured TMFs in a Psi-Coverage configuration.

1.3 Additional Information More information about this feature, and related topics, can be found in the following documents: ◾ Manage Psi-Coverage ◾ Installing Psi-Coverage Hardware ◾ Psi-Coverage Hardware Description ◾ Psi Configuration File Generator More information about the ASM alarm Find Faulty Antenna can be found in the OSSlibrary.

2 Feature Operation This section describes the Psi-Coverage feature in more detail, including network configuration requirements and operation flows.

2.1 Network Requirements This is a licensed feature. This means that for the feature to be operational, a valid license key must be installed, and the feature must be explicitly activated by setting a MOM attribute. See Feature Activation and Deactivation for more details. In the case of asymmetrical uplink/downlink bandwidth, Psi-Coverage also requires a license for feature PUCCH Overdimensioning.

2.2 Feature Limitation and Notes The feature has the following limitations: ◾ Psi-Coverage with PUCCH overdimensioning does not support Sounding Reference Signal (SRS). ◾ Psi-Coverage does not support: ◾ Time Division Duplex (TDD) ◾ Multistandard Mixed Mode (MSMM). ◾ Sub band Radio. ◾ Carrier Aggregation (CA) with FDD and TDD. ◾ Carrier Aggregation (CA) with more than two carriers. ◾ Psi solution enhancements with Y-coverage. ◾ Psi-Coverage only supports 2Tx2Rx. ◾ TMF and TTMF are band-associated. ◾ Uplink bandwidth is limited by Radio IBW and OBW, see Table 2.


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◾ Radio IBW>= 4x bandwidth to fit carriers from three antennas and guard bands. ◾ Radio OBW capacity>= 3x bandwidth to decode three carriers. The feature notes are as follows: ◾ RfBranch settings: Add 5 dB to DlAttenuation as compensation when a TMA with Frequency shift (TMF) is deployed. This is not applicable when a Triple TMA with Frequency shift (TTMF) is deployed. ◾ Always connect RRU RF port A to TMF port A. Do not connect RF port A to TMF port B. ◾ Do not deploy TMF and TMA simultaneously in the same cell. ◾ For each Psi-Coverage Cell the TMF file setting requires that: ◾ all TMFs have the same ifBandwidth and air frequency ◾ all branches of each TMF have the same feeder frequency (TMFs can have different feeder frequencies) ◾ ◾ For each Psi-Coverage Cell, set the difference between feeder frequencies for adjacent TMFs larger than the ifBandwidth. ◾ Configure configuredMaxTxPower : ◾ Set the value of configuredMaxTxPower so that the total power in the cell is distributed equally between the sector carriers. ◾ Make sure that the three sector carriers in each cell refer to the same SectorEquipmentFunction . ◾ The sector carriers have the same number of TX and RX antennas. ◾ In the factory version of TTMF and TMF, the DC monitor default setting is ON in RBS port B. Hardware fault alarm is displayed during antenna-near unit configuration. It blocks the process of site-installation. Continue as follows: ◾ Set the DC monitor to OFF on RBS port B in the TMF Configuration File Generator tool, ◾ Update the new TMF configuration file, ◾ Restart the RRU. ◾ Co-operation with feature Combined Cell: ◾ If there is more than one sector carrier, and all belong to the same cell and refer to the same sectorEquipmentFunction, then the Psi-Coverage feature is active and the Combined Cell feature is inactive. ◾ If there is more than one sectorCarrier belonging to the same cell, but each refers to a different sectorEquipmentFunction, then the Combined Cell feature is active and the Psi-Coverage feature is inactive. ◾ If there is more than one sectorCarrier and only some of the carriers refer to the same sectorEquipmentFunction, then the configuration is faulty.


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◾ Calculation algorithm for ulAttenuation: ◾ If the ulAttenuation on all branches is -1, the total ulAttenuation is -1 ◾ If the ulAttenuation on one branch is -1, the value -1 is neglected for calculation. Example1: Branch A is 30, branch B is 20, branch C is -1, the total ulAttenuation is (30+20)/2=25 Example2: Branch A is -1, branch B is 20, branch C is -1, the total ulAttenuation is 20. ◾ Do not set ulAttenuation to 65535 on any branch.

2.3 PUCCH Overdimensioning and PUSCH Blocking Table 2 describes the feature parameters for the DU Radio Node. Table 2

PUCCH Overdimensioning and PUSCH Blocking Parameters (DU Radio Node)

DL UL IBW pucchOverdimensioning ulConfigurableFrequencyStart Bandwidth Bandwidth 20 MHz

5 MHz

>= 20 MHz

38

39

20 MHz

10 MHz

>= 40 MHz

25

26

20 MHz

10 MHz

30 MHz

30

31

20 MHz

10 MHz

35 MHz

28

29

20 MHz

15 MHz

>= 60 MHz

13

14

15 MHz

5 MHz

>= 20 MHz

25

34

15 MHz

10 MHz

>= 40 MHz

13

18

15 MHz

10 MHz

30 MHz

16

22

15 MHz

10 MHz

35 MHz

17

23

10 MHz

10 MHz

30 MHz

3

7

10 MHz

10 MHz

35 MHz

4

9

10 MHz

5 MHz

16 MHz

14

29

10 MHz

5 MHz

13

27


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DL UL IBW pucchOverdimensioning ulConfigurableFrequencyStart Bandwidth Bandwidth >= 20 MHz 5 MHz

5 MHz

16 MHz

4

17

Table 3 describes the feature parameters for the Baseband Radio Node. Table 3

PUCCH Overdimensioning and PUSCH Blocking Parameters (Baseband Radio Node

DL UL IBW pucchOverdimensioning ulConfigurableFrequencyStart Bandwidth Bandwidth 20 MHz

5 MHz

>= 20 MHz

38

39

20 MHz

10 MHz

>= 40 MHz

25

26

20 MHz

10 MHz

30 MHz

30

31

20 MHz

10 MHz

30 MHz

29

30

20 MHz

10 MHz

30 MHz

28

29

20 MHz

10 MHz

35 MHz

29

30

20 MHz

10 MHz

35 MHz

28

29

20 MHz

10 MHz

35 MHz

27

28

20 MHz

15 MHz

>= 60 MHz

13

14

15 MHz

5 MHz

>= 20 MHz

25

34

15 MHz

10 MHz

>= 40 MHz

13

18

15 MHz

10 MHz

30 MHz

16

22

15 MHz

10 MHz

35 MHz

17

23

10 MHz

10 MHz

30 MHz

3

7

10 MHz

10 MHz

35 MHz

4

9

10 MHz

5 MHz

16 MHz

15

31


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DL UL IBW pucchOverdimensioning ulConfigurableFrequencyStart Bandwidth Bandwidth 10 MHz 5 MHz 16 16 33 MHz 10 MHz

5 MHz

16 MHz

17

35

10 MHz

5 MHz

>= 20 MHz

13

27

5 MHz

5 MHz

16 MHz

4

17

Set ulInterferenceManagementActive to false before ulConfigurableFrequencyStart takes effect. These parameters are recommended to narrow the UL bandwidth, and to make sure that there is no scheduling outside the radio bandwidth. Smaller UL bandwidths are also available. Different internal radio units and external radio units have different bandwidth capabilities. This means that these parameters have different values when different hardware is used.

3 Parameters This section describes configuration parameters for the Psi-Coverage feature, and parameters that are affected when the feature is activated.

3.1 Feature Configuration Parameters This section describes configuration parameters for the Psi-Coverage feature. Table 4 describes the feature parameters introduced in MO CellPortion. Table 4

Feature Parameters in MO CellPortion

Parameter

Description

DU Radio Node: TmaType

Specifies the type of tower mounted amplifier, TMA, or TMF.

DU Radio Node: tmfData

TMF configuration data, including: dlAttenuation, dlTrafficDelay, ifBandwidth, ulAirFrequency, ulFeederFrequency, ulTrafficDelay.

altitude

The altitude of the transmitter antenna in meters. Use +/- values to denote height/depth.

cellPortionCoverage

Models the cell portion coverage area used for UE positioning. The cell portion coverage area is defined by the bearing, opening angle, and radius.

CellPortionId

A unique identifier for a cell portion within the cell. Cell portion is system attribute not visible by the UE, and Cell portion ID is not transmitted over the air. The value component of the RDN.

cellPortionPolygon

Models the manageable characteristics for the cell portion polygon used for UE positioning. Each polygon corner is described by a latitude and longitude pair. Each polygon corner is represented with one position in the sequence. The other configured polygon corners follow in sequence.


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Parameter

Description

latitude

The degree of latitude of the transmitter antenna position.

longitude

The degree of longitude of the transmitter antenna position.

lppaCellPortionId

The LPPa Cell Portion ID IE defined in 3GPP TS 36.455.

sectorCarrierRef

Reference to an instance of SectorCarrier MO.

Table 5 describes the parameters introduced in MO SectorCarrier. Table 5

Parameters in MO SectorCarrier

Parameter

Description

DU Radio Node: partOfSectorPower

Requested part of the total power in the SectorEquipment that must be allocated for the SectorCarrier. The output power is evenly distributed over antenna connectors used for TX transmission allocated for the SectorCarrier.

Baseband Radio Node: configuredMaxTxPower

Maximum output power to be used in a SectorCarrier. The output power is evenly distributed over antenna connectors used for TX transmission allocated for the SectorCarrier.

Table 6 describes the parameters introduced in MO TmfConfiguration. Note: If the MO TmfConfiguration is set, then the legacy way of Psi-configuration is overwitten by the simplified Psi-configuration. Table 6

Parameters in MO TmfConfiguration

Parameter

Description

tmfConfigurationId

The value component of the RDN.

operatingBand

The supported Band for TMF/TTMF.

operatingMode

The supported operating mode.

channelNumber1

Absolute Radio Frequency Channel Number for uplink carrier.

channelNumber2

The second uplink carrier Absolute Radio Frequency Channel Number if two carriers are defined.

frequencyDistance

The frequency distance between two carriers. If 0, the RBS sets the frequency distance according to the TMF Rx frequency range and the carrier bandwidth.

antBtoRbsB

Indicates if ANT port B is connected to RBS, A or B.

dcMonitoringRbsA

Indicates if there is a need of DC monitoring of RBS A.

dcMonitoringRbsB

Indicates if there is a need of DC monitoring of RBS B. Dependency: The default value of this attribute depends on the operatingMode.

ifFilterBit

Indicates what IF filter (5Mhz or 10MHz) is being used. 0 means 5MHz IF filter. Dependency: The default value of this attribute depends on the operatingMode.

dcToRetBlocked

Indicates if DC to RET is blocked or not. 0 means DC to RET is not blocked. 1 means DC to RET is blocked if not connected.

dcMonitoringAntA

Indicates if there is a need of DC monitoring of ANT A.

dcMonitoringAntB

Indicates if there is a need of DC monitoring of ANT B.


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Parameter

Description

Baseband Radio Node Y configuration

Indicates if it is a Psi-configuration or Y-configuration. the default

support: deploymentType

value 0 means Psi-configuration, 1 means Y-configuration.

3.2 Affected Parameters The implementation of this feature affects no parameters.

3.3 Parameters Affecting the Feature This section describes parameters affecting the Psi-Coverage feature. Table 7 describes parameters that affect the feature. Table 7

Parameters Affecting the Feature

Parameter

Description

pucchOverdimensioning

Specifies the number of resource blocks, at each band edge outside of the active PUCCH region, that is available for scheduling of PUSCH.

ulConfigurableFrequencyStart

Specifies the start frequency offset for the allocation of resources, when the UL interference management is disabled, expressed as a percentage of the configured bandwidth.

ulFrequencyAllocationProportion

Specifies the amount of frequency resources that is allocated in UL expressed as a percentage of the configured bandwidth.

ulInterferenceManagementActive

Specifies if UL interference management is enabled or disabled. Set ulInterferenceManagementActive to false.

4 Network Impact This section describes how the Psi-Coverage feature impacts the network functions and capabilities.

4.1 Capacity If UL and DL bandwidth is symmetrical, Psi-Coverage provides comparable capacity to common three-sector antenna cell configurations. If UL and DL bandwidth is asymmetrical, Psi-Coverage provides comparable downlink capacity and degraded uplink capacity to the common three-sector antenna cell configuration because of the frequency shifting on UL.

4.2 Coverage Psi-Coverage provides comparable coverage to the similar combined cell configuration.

4.3 Mobility No neighbor relations establish among sector carriers as combined cell. This enables a reduction in the number of handovers.

5 Associated Features and Affected Functions This section describes how the Psi-Coverage feature affects other features and functions.


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5.1 Prerequisite Features Table 8 lists prerequisite features to the Psi-Coverage feature, that is, they must be active before the Psi-Coverage feature is introduced if the UL and DL bandwidth is asymmetrical. Table 8

Prerequisite Features for Psi-Coverage

Feature

Description

Prerequisite Features for Psi-Coverage PUCCH Overdimensioning

If UL and DL bandwidth is asymmetrical, Psi-Coverage requires a license for PUCCH Overdimensioning.

Table 9

Prerequisite Features for Psi-Coverage with Carrier Aggregation (CA)

Feature

Description

Prerequisite Features for Psi-Coverage with Carrier Aggregation (CA) Carrier Aggregation

This feature is required for the CA functionality.

Dynamic SCell Selection for Carrier

This feature is required for the single Psi-Coverage cell and three-

Aggregation

sector configuration (CA configuration 4).

Supplementary Downlink for Carrier

This feature is required for the following CA configurations: ◾ Single Psi-Coverage cell and single DI cell with separate

Aggregation

radio units (CA configuration 2.) ◾ Single Psi-Coverage cell and single DI cell with shared radio units (CA configuration 3).

Table 10

Prerequisite Features for Psi solution enhancements

Feature

Description

Prerequisite Features for Psi solution enhancements LPPa-based E-CID Support. ◾ Antenna System Monitoring

This feature is required for antenna-based positioning . The features are required for cable supervision..

◾ VSWR Antenna Supervision

5.2 Affected Features Table 11 lists features that are affected by the Psi-Coverage feature. Table 11

Affected Features

Feature

Description

Combined Cell

Combined Cell feature is inactivated while Psi-Coverage feature is active.

5.3 Related Features There are no other features related to this feature.


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5.4 Affected System Functions This feature does not affect system functions.

6 Performance This section describes performance indicators, counters, and events associated with the Psi-Coverage feature.

6.1 Key Performance Indicators Table 12 lists the main Key Performance Indicators (KPIs) associated with the PsiCoverage feature. Table 12

KPIs

KPI

Description

UL throughput

If UL and DL bandwidth is asymmetrical, cell UL throughput degrades with UL bandwidth limitation due to TMF frequency shift.

For more information about KPIs, see Key Performance Indicators.

6.2 Counters This feature has three associated counters. They are not currently available. ◾ pmSinrPucchSectorCarrierDistr ◾ pmSinrPuschSectorCarrierDistr ◾ pmRadioRecInterferencePwr For a full list with detailed information about counters, see the list files in the Planning library folder.

6.3 PM Events This feature has no associated events. For a full list with detailed information about PM events, see the list files in the Planning library folder.

7 Feature Activation and Deactivation Activating the feature requires that the license is installed. Feature activation and deactivation is described in Manage Licenses. The MO instance used to control the feature state is listed in Table 1.

Copyright

© Ericsson AB 2016. All rights reserved. No part of this document may be reproduced in any form without the written permission of the copyright owner.

Disclaimer


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The contents of this document are subject to revision without notice due to continued progress in methodology, design and manufacturing. Ericsson shall have no liability for any error or damage of any kind resulting from the use of this document.

Trademark List

All trademarks mentioned herein are the property of their respective owners. These are shown in the document Trademark Information.

Psi-Coverage LTE


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