EUL Multi-Carrier

USER DESCRIPTION

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Copyright

© Ericsson AB 2014. All rights reserved. No part of this document may bereproduced in any form without the written permission of the copyright owner.

Disclaimer

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

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

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Contents

Contents

1 Introduction 1

1.1 Basic Characteristics 1

1.2 Benefits 1

2 Feature Operational Description 3

2.1 Network Requirements 4

3 Parameters 5

3.1 Introduced Parameters 5

3.2 Affected Parameters 5

4 Network Impact 7

4.1 Subscriber Capacity 7

4.2 Network Performance 7

4.3 Hardware 7

4.4 Inter-Node Interface 7

4.5 Other Network Elements 7

5 Associated Features and Affected Functions 9

5.1 Prerequisite Features 9

5.2 Affected Features 9

5.3 Related Features 9

5.4 Affected System Functions 9

6 Performance 11

6.1 KPIs 11

6.2 Counters 11

6.3 Events 11

7 Operation and Maintenance 13

7.1 Activating the Feature 13

7.2 Deactivating the Feature 14

7.3 Engineering Guidelines 14

Reference List 15

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Introduction

1 Introduction

This document describes the EUL Multi-Carrier feature and its main benefitsand impacts in the WCDMA RAN.

1.1 Basic Characteristics

This document describes the EUL Multi-Carrier feature and its main benefitsand impacts in the WCDMA RAN. The EUL Multi-Carrier feature correspondsto DC-HSUPA in the 3GPP Rel-9 standard.

The feature introduces support for User Equipment (UE) to use EnhancedUplink (EUL) on two adjacent carriers. This means that simultaneous uplinkE-DCH transmission on two adjacent carriers is supported from a given UE.This is therefore, the uplink equivalence to the HSDPA Multi-Carrier supportin downlink.

Feature identity:FAJ 121 1491: EUL Multi-Carrier

Release: Introduced in W14.1

Dependencies

This feature requires the following RAN features to be active:

• FAJ 121 1516: Improved Layer 2 UL

• FAJ 121 1441: HSDPA Multi-Carrier

• FAJ 121 1320/FAJ 121 1481: SRB on HSDPA/F-DPCH

• FAJ 121 1317: EUL 2-ms TTI

This feature also requires the following Core Network feature to be active:FAJ 121 1808/1: Enhanced Uplink Sup Exp2, 8-11 Mbps. For more informationabout this feature, see Reference [1] and Reference [2].

This feature affects no other features.

1.2 Benefits

This section describes the benefits of this feature.

EUL Multi-Carrier enables a UE compatible with 3GPP Rel-9 DC-HSUPA tooperate on two uplink carriers simultaneously. This brings the following benefits:

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• Up to 100% higher L1 peak data rate.

• Up to 100% higher average RLC throughput.

The feature enables increased carrier use in uplink because of independentscheduling on two carriers.

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Feature Operational Description

2 Feature Operational Description

This section describes the EUL Multi-Carrier feature in more detail, includingnetwork configuration requirements and operation flows.

The EUL Multi-Carrier feature gives the UE possibility to send user data on EULon two carriers. These two cell carriers have to be adjacent. They must be inthe same sector in the RBS and they must be handled by the same BB pool.

Each UL carrier is paired with a downlink carrier; therefore, EUL Multi-Carrieris always run together with HSDPA Multi-Carrier.

EUL Multi-Carrier is only supported using 2-ms TTI, Improved Layer 2, and onlyin combination with SRB on HSDPA/F-DPCH and HSDPA Multi-Carrier.

The two E-DCH cell carriers in the serving RBS involved in the EUL Multi-Carrierconnection of a given UE are referred to as the primary serving E-DCH cell andthe secondary serving E-DCH cell.

A cell can act as both a primary serving cell and a secondary serving cell. A cellcan be a primary serving cell for one Multi-Carrier UE unit. The same cell canwork as a secondary serving cell for another EUL Multi-Carrier UE unit. Theopposite is also true.

The secondary uplink carrier can be activated or deactivated for an EULMulti-Carrier UE. The UE has the possibility to transmit on the secondaryuplink carrier only when it is activated. The UE is informed of the activation ordeactivation through signalling on HS-SCCH.

The secondary uplink carrier for an EUL Multi-Carrier UE is by default indeactivated state. The serving RBS decides if the secondary carrier has to beactivated or deactivated. Activation can be done to maximize UE throughputin uplink. Deactivation can be done because of inactivity in uplink. It can bealso done to reduce a UE output power, to minimize uplink interference in acell, or because of resource limitations.

The inactivity in uplink is evaluated periodically. An inactivity timer is startedwhen a user that is set up as EUL-MC with UL secondary carrier active becomesinactive on both the primary and secondary serving radio links. If the userremains inactive at the timer expiry, the UL secondary carrier is deactivated.The inactivity timer is defined by parameter eulMcInactivityTime, which ishard-coded to 500 ms.

The need to reduce UE output power is evaluated by using the schedulinginformation from the UE on the secondary carrier.

Currently, handover for EUL Multi-Carrier is not supported. For handoverfor EUL Multi-Carrier UE, a reconfiguration to EUL single-carrier takes placebefore handover.

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EUL Multi-Carrier is not supported over Iur.

2.1 Network Requirements

The following must be fulfilled at feature activation:

• The license key for FAJ 121 1491, EUL Multi-Carrier, must be installed inthe RBSs before feature activation.

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Parameters

3 Parameters

This section describes parameters introduced by the EUL Multi-Carrier featureand parameters affected by activating the feature.

3.1 Introduced Parameters

Table 1 describes the parameters introduced by the feature.

Table 1 Introduced Parameters

Parameter Description

MultiCarrier::eulMultiCarrierSupport

Support for EUL Multi-Carrier.

Handover::hsIflsPrio.eulMc Configures the priority order in which cell and UE capabilities areevaluated by IFLS.

NodeBFunction::licenseStateEulMc

License state indicating if the license is ENABLED or DISABLED.That is, if a valid license key for the feature is installed.

RbsLocalCell::featureStateEulMc

Feature state for the licensed feature EUL Multi-Carrier, indicatingif the feature is ACTIVATED or DEACTIVATED for this cell.

RbsLocalCell::eulMcActivationDelayTime

When an activation of a secondary UL carrier for an EULMulti-Carrier user is triggered by an initial EUL Multi-Carriersetup, the execution of the activation is delayed byeulMcActivationDelayTime. The purpose of the delayparameter is to give the RNC time to make secondary carriermeasurements before the execution of the secondary UL carrieractivation in the serving RBS. The delay is applicable for all EULMulti-Carrier users having their primary serving E-DCH cell in thiscell.

RbsLocalCell::eulMcCapability

Indicates if the cell can act as a serving cell for an EULMulti-Carrier connection.

3.2 Affected Parameters

Table 2 describes the parameters affected by the feature.

Table 2 Affected Parameters

Parameter Description

Carrier::hsdpaMcInactivityTimer

The DL secondary serving HS-DSCH cell cannot be deactivatedif a corresponding UL secondary cell carrier exists and isactivated. If the UL secondary cell carrier is activated and thehsdpaMcInactivityTimer expires, the deactivation of the DLsecondary serving HS-DSCH cell must wait until the UL secondarycell carrier is deactivated.

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Network Impact

4 Network Impact

This section describes how the EUL Multi-Carrier feature affects the networkfunctions and capabilities.

4.1 Subscriber Capacity

EUL Multi-Carrier can provide up to 100% increase in maximum achievableEUL user throughput compared to EUL single carrier.

4.2 Network Performance

An EUL Multi-Carrier user allocates additional resources for the secondarycell carrier.

• Additional hardware (channel elements).

• Additional EUL scheduling processing resources (number of EUL users orE-DCH Radio Links).

• Signalling resources.

• Transport bearers.

4.3 Hardware

This feature requires the Digital Unit WCDMA (DUW) hardware to be installed.

4.4 Inter-Node Interface

No feature-specific information is identified.

4.5 Other Network Elements

No feature-specific information is identified.

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Associated Features and Affected Functions

5 Associated Features and AffectedFunctions

This section describes how the EUL Multi-Carrier feature affects other featuresand functions.

5.1 Prerequisite Features

Table 3 lists prerequisite features to the EUL Multi-Carrier feature, that is, theymust be active before introducing the EUL Multi-Carrier feature.

Table 3 Prerequisite Features

Feature Description

Improved layer 2 UL This feature enables a configurable RLC Protocol Data Unit(PDU) size and supports MAC-i/is on a single carrier.

HSDPA Multi-Carrier This feature enables simultaneous downlink HSDPAtransmission on two cells.

SRB on HSDPA/F-DPCH This feature enables establishment of downlink SignallingRadio Bearer (SRB) on the HS-DSCH channel and use ofF-DPCH channels.

EUL 2-ms TTI This feature enables EUL 2 ms TTI.

5.2 Affected Features

This feature affects no other feature.

5.3 Related Features

This feature is not related to any other feature.

5.4 Affected System Functions

Table 4 lists functions affected by the EUL Multi-Carrier feature.

Table 4 Affected System Functions

Function Description

Licenses and HardwareActivation Codes

To activate the EUL Multi-Carrier feature, the license for the feature must beinstalled and enabled.

EUL User Plane If the EUL Multi-Carrier feature is activated, EUL user throughput can increasewith up to 100%.

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Function Description

EUL Migration andActivation

If the EUL Multi-Carrier feature is activated, EUL user throughput can increasewith up to 100%.

Enhanced UL Scheduler If the EUL Multi-Carrier feature is activated, EUL user throughput can increasewith up to 100%.

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Performance

6 Performance

This section describes performance indicators, counters, and events associatedwith the EUL Multi-Carrier feature.

6.1 KPIs

This feature has no associated Key Performance Indicators (KPIs).

6.2 Counters

Table 5 lists the counters introduced by the EUL Multi-Carrier feature.

Table 5 Counters

Counter Description

UtranCell::pmSumEulMcConn The sum of all sample values recorded during a ROP for thenumber of established EUL Multi-Carrier connections.

UtranCell::pmSamplesEulMcConn

The number of samples recorded within the ROP forpmSumEulMcConn.

More information about counters can be found in Managed Object Model RNCand Managed Object Model RBS.

6.3 Events

This feature has no associated events.

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Operation and Maintenance

7 Operation and Maintenance

This section provides Operation and Maintenance (O&M) information for theEUL Multi-Carrier feature.

7.1 Activating the Feature

7.1.1 Preconditions

This feature requires the following RAN features to be active:

• FAJ 121 1516: Improved Layer 2 UL

• FAJ 121 1441: HSDPA Multi-Carrier

• FAJ 121 1320/FAJ 121 1481: SRB on HSDPA/F-DPCH

• FAJ 121 1317: EUL 2-ms TTI

This feature also requires the following Core Network feature to be active:FAJ 121 1808/1, Enhanced Uplink Sup Exp2, 8-11 Mbps.

7.1.2 Activating

The feature is activated by:

• Ordering and installing FAJ 121 1491: EUL Multi-Carrier with license keyCXC 402 0037.

• Setting the RBS parameter RbsLocalCell::featureStateEulMc toACTIVATED.

Activation of the feature takes effect immediately.

When EUL Multi-Carrier is activated, the following read-only parameters can beused for checks:

• If NodeBFunction::licenseStateEulMc equals ENABLED, the licenseis valid.

• MultiCarrier::eulMultiCarrierSupport monitors if the cellsupports EUL Multi-Carrier, that is, if the activation of EUL Multi-Carrier issuccessful.

More information about licenses can be found in Licenses and HardwareActivation Codes.

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7.2 Deactivating the Feature

7.2.1 Preconditions

This feature has no preconditions for deactivating.

7.2.2 Deactivating

The feature is deactivated by setting the RBS parameter RbsLocalCell::featureStateEulMc to DEACTIVATED.

More information about licenses can be found in Licenses and HardwareActivation Codes.

7.3 Engineering Guidelines

UL inter-cell interference can occur on the secondary carrier because thesecondary carrier is activated immediately after setup. This applies toheterogeneous networks, among others. The secondary carrier is activatedblindly without measurements from the secondary carrier at RAB establishment,channel switching, and so on.

Use of the parameter RbsLocalCell::eulMcActivationDelayTime isrecommended to let the UE perform necessary measurements before theactivation of the secondary carrier.

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Reference List

Reference List

[1] GGSN-MPG 2011A Network Impact, 3/109 48-AXB 250 12

[2] EPG Feature, 19/221 02-AXB 250 12-V1

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