differentiated admission control.pdf

Differentiated Admission Control

USER DESCRIPTION

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Copyright

Ericsson AB 2011. 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.

Trademark List

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

1.3 Additional Information 2

2 Feature Operation 3

2.1 Network Requirements 3

2.2 Feature Operation Sequence Diagram 3

3 Parameters 7

3.1 Introduced Parameters 7

3.2 Affected Parameters 7

4 Network Impact 9

4.1 Capacity 9

4.2 Mobility 9

5 Associated Features and Affected Functions 11

5.1 Prerequisite Features 11

5.2 Affected Features 11

5.3 Related Features 11

5.4 Affected System Functions 11

6 Performance 13

6.1 KPIs 13

6.2 Counters 13

6.3 Events 14

7 O&M Information 17

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Introduction

1 Introduction

This document describes the Differentiated Admission Control feature and itsmain benefits and impacts in the LTE RAN.

The purpose of Differentiated Admission Control feature is to provide the RBSwith a mechanism to preempt previously admitted UEs based on the Allocationand Retention Priority (ARP) Information Elements (IEs) (that is, priority level,preemption vulnerability, and preemption capability as specified in 3GPP TS23.203 and 3GPP TS 23.401) received from the core network in order to freeup resources for new high priority UEs and new high priority bearers.

1.1 Basic Characteristics

This section describes the basic characteristics of the feature.

Feature Identity

FDD: FAJ 121 1787, Differentiated Admission Control

TDD: FAJ 221 1787, Differentiated Admission Control

Replaces: N/A

Dependencies

This feature has no prerequisite features.

This feature affects no other features.

1.2 Benefits

This section describes the benefits of this feature.

When Differentiated Admission Control feature is activated, one or morepreviously admitted UEs can be preempted to allow a new high priority UE ornew high priority bearers to enter the system. By configuring the ARP IEs inthe core network, UEs and Enhanced Radio Access Bearers (E-RABs) areprioritized against each other. The high priority UEs and high priority E-RABswill enjoy higher accessibility, higher retainability, and higher mobility, at thecost of low priority UEs and low priority E-RABs getting lower retainability.

The Differentiated Admission Control feature operates when the RBS receivesa resource request, for example, at initial access, E-RAB setup, and incominghandover, and there is a resource shortage. Resource shortage can be onconnection level or bearer level resources and it can be due to any reason such

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as license limits, hardware and software limits, or admission control functionssuch as the Admission Control function and the Dynamic GBR AdmissionControl feature.

Without the Differentiated Admission Control feature, any resource shortagewill lead to rejection of the resource request. With the Differentiated AdmissionControl feature, resource shortage will lead to a controllable prioritizationbetween already admitted users and the resource request.

1.3 Additional Information

More information about this feature and related topics can be found in thefollowing documentation:

3GPP TS 23.203, Policy and charging control architecture

3GPP TS 23.401, GPRS enhancements for E-UTRAN access

3GPP TS 36.331, Radio Resource Control (RRC)

3GPP TS 36.413, S1 Application Protocol (S1AP)

3GPP TS 36.423, X2 Application Protocol (X2AP)

Admission Control

Quality of Service

Dynamic GBR Admission Control

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Feature Operation

2 Feature Operation

This section describes the Differentiated Admission Control feature in moredetail, including network configuration requirements and operation flows.

2.1 Network Requirements

The following must be fulfilled at feature activation:

Core network configured to differentiate ARP IEs for E-RABs, that is,priority level, preemption vulnerability and preemption capability

2.2 Feature Operation Sequence Diagram

The core network elements are configured to provide E-RABs with differentiatedARP IEs (as specified in 3GPP TS 23.203 and 3GPP TS 23.401) and activatethe Differentiated Admission Control feature in the RBS (see Section 7 onpage 17).

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L0000504A

Request

Resourse shortage

Search for UEsto pre-empt

Pre-empt UEs

RejectAdmit

UEs to pre-empt found Else

Else

Admit

Figure 1 Admission Control Resource Request

If there is a resource shortage when the RBS receives a resource request(over the Uu, S1, or X2 interface, for example, at RRC Connection Request,Initial Context Setup Request, E-RAB Setup Request, or Handover Requestas described in 3GPP TS 36.331, 3GPP TS 36.413, and 3GPP TS 36.423), asearch for UE (of lower priority than in the request) to be pre-empted is started.If the search for UEs to preempt is successful, they are pre-empted and thenew resource request is admitted, or else the new resource request is rejected.

The following principles apply to find UEs to pre-empt (a candidate UE is a UEthat would like to pre-empt other served UEs):

A candidate UE can only pre-empt a served UE if any of the candidateUEs E-RAB(s) have the ARP IE Pre-emption Capability set to may triggerpre-emption

A candidate UE can only pre-empt a served UE that have the ARP IEPre-emption Vulnerability of all its E-RABs set to pre-emptable and/or allNon-GBR E-RABs have been inactive longer than a pre-defined time

A candidate UE can only pre-empt a served UE if the served UEs E-RABwith the lowest numerical ARP Priority Level value is higher than the

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Feature Operation

candidate UEs E-RAB with the lowest numerical ARP Priority Level value(i.e. if the candidate UEs highest priority bearer has higher priority than theserved UEs highest priority bearer)

The E-RAB resources required by the candidate UE may pre-empt one orseveral served UEs

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Parameters

3 Parameters

This section describes parameters introduced by the Differentiated AdmissionControl feature and 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

arpBasedPreEmptionState Activates or deactivates ARP-based UE preemption

3.2 Affected Parameters

The implementation of this feature affects no parameters.

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Network Impact

4 Network Impact

This section describes how the Differentiated Admission Control featureimpacts the network functions and capabilities.

4.1 Capacity

This section provides information on the impact of the feature on networkcapacity.

High-priority users will have increased accessibility; low-priority users will havelower retainability.

4.2 Mobility

This section provides information on the impact of the feature on mobility.

The high priority E-RABs will have higher mobility success rate withdifferentiated admission control.

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Associated Features and Affected Functions

5 Associated Features and AffectedFunctions

This section describes how the Differentiated Admission Control feature affectsother features and functions.

5.1 Prerequisite Features

This feature has no prerequisite features.

5.2 Affected Features

This feature affects no other feature.

5.3 Related Features

Table 2 lists features that are related to the Differentiated Admission Controlfeature.

Table 2 Related Features

Feature Description

Admission Control The Admission Control feature can reject resource requests.Using the Differentiated Admission Control feature, such rejectedrequests can be prioritized versus the already admitted UE.

Quality of Service The Quality of Service feature coordinates and assigns theappropriate QoS to other functions in LTE RAN.

Dynamic GBR Admission Control The Dynamic GBR Admission Control feature can reject resourcerequests. Using the Differentiated Admission Control feature,such rejected requests can be prioritized versus the alreadyadmitted UE.

5.4 Affected System Functions

This feature affects no system functions.

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Performance

6 Performance

This section describes performance indicators, counters, and events associatedwith the Differentiated Admission Control feature.

6.1 KPIs

Table 3 lists the main Key Performance Indicators (KPIs) associated with theDifferentiated Admission Control feature.

Table 3 KPIs

KPI Description

Accessibility The ability of a service to be obtained, within specified tolerances and othergiven conditions, when requested by the user.

Retainability The ability of a service, once obtained, to continue to be provided undergiven conditions for a requested duration.

Mobility The performance of all types of handover.

6.2 Counters

Table 4 lists the counters associated with the Differentiated Admission Controlfeature.

Table 4 Counters

Counter Description

pmUeCtxtRelAbnormalEnb Total number of abnormal UE context releases initiated by theRBS

The counter is stepped regardless of whether data was lost inUL(1) or DL(2) buffers.

pmUeCtxtRelAbnormalEnbPe Total number of abnormal UE context releases initiated by theRBS due to UE preemption

The counter is stepped regardless of whether data was or wasnot lost in UL or DL buffers.

pmUeCtxtRelAbnormalEnbAct Total number of abnormal UE context releases initiated by theRBS and that there was data in either the UL or DL buffer (active).

pmUeCtxtRelAbnormalEnbActPe Total number of abnormal UE context releases initiated by theRBS due UE to preemption and that there was data in either theUL or DL buffer (active).

pmErabRelAbnormalEnb Total number of abnormal E-RAB releases initiated by the RBS

The counter is stepped regardless of whether data was lost inUL or DL buffers

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Counter Description

pmErabRelAbnormalEnbPe The total number of abnormal E-RAB releases initiated by theRBS due to UE preemption

The counter is stepped regardless of whether data was lost inUL or DL buffers.

pmErabRelAbnormalEnbAct Total number of abnormal E-RAB releases initiated by the RBSwhen data was in either the UL or DL buffer (active)

pmErabRelAbnormalEnbActPe Total number of abnormal E-RAB releases initiated by the RBSdue to UE preemption when data was in either the UL or DLbuffer (active)

(1) Uplink(2) Downlink

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

6.3 Events

Table 5 lists the events associated with the Differentiated Admission Controlfeature.

Table 5 Events

Event Event Parameter Description

INTERNAL_PROC_ERAB_SETUP

INTERNAL_PROC_ERAB_RELEASE

INTERNAL_PROC_HO_PREP_S1_IN

INTERNAL_PROC_HO_PREP_X2_IN

INTERNAL_PROC_UE_CTXT_RELEASE

INTERNAL_PROC_INITIAL_CTXT_SETUP

EVENT_ARRAY_ERAB_SETUP_REQ_ARP

ARP priority level for each E-RABin the request

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Performance

Event Event Parameter Description







EVENT_ARRAY_ERAB_SETUP_REQ_PCI

ARP preemption capability for eachE-RAB in the request







EVENT_ARRAY_ERAB_SETUP_REQ_PVI

ARP preemption vulnerability foreach E-RAB in the request

More information about events can be found in PM Event List.

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O&M Information

7 O&M Information

This section provides Operation and Maintenance (O&M) information for theDifferentiated Admission Control feature.

Activate the Differentiated Admission Control feature by setting thefeatureStateDifferentiatedAdmissionControl and arpBasedPreEmptionState parameters in the DifferentiatedAdmissionControl andAdmissionControl Managed Object (MO) class, respectively. Full detailsof the license activation process can be found in License Management. TheDifferentiated Admission Control feature and related functions are managedthrough the Managed Object Model RBS. More information can be found inManaged Object Model (MOM) User Guide.

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toc1 Introduction1.1 Basic CharacteristicsDependencies1.2 Benefits1.3 Additional Information2 Feature Operation2.1 Network Requirements2.2 Feature Operation Sequence Diagram3 Parameters3.1 Introduced Parameters3.2 Affected Parameters4 Network Impact4.1 Capacity4.2 Mobility5 Associated Features and Affected Functions5.1 Prerequisite Features5.2 Affected Features5.3 Related Features5.4 Affected System Functions6 Performance 6.1 KPIs6.2 Counters6.3 Events7 O&M Information

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