microsoft powerpoint - oeo106010 lte eran6.0 idle mode behavior issue 1

8/13/2019 Microsoft PowerPoint - OEO106010 LTE eRAN6.0 Idle Mode Behavior ISSUE 1

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LTE eRAN2.1 Idle Mode Behavior

Confidential Information of Huawei. No

Spreading Without Permission

www.huawei.com

Copyright 2013 Huawei Technologies Co., Ltd. All rights reserved.

LTE eRAN6.0 Idle ModeBehavior


Foreword

UE behaviors in idle mode include:

PLMN selection

System information reception

Cell selection and reselection

Tracking area registration

Paging procedure

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Objectives

Upon completion of this course, you will be able to:

Describe the UE behaviors in RRC idle mode

Describe the feature and algorithms of each behavior

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Contents

1. Idle Mode Overview

2. PLMN selection

3. Cell Selection & Reselection

4. System Information Reception

5. Tracking Area Registration

6. Paging Monitoring Procedure

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Idle Mode Description

A UE that is powered on but does not have an RRC connection to the

radio network is considered to be in idle mode

Idle mode management can increase the access success rate,

improve the quality of service, and ensure that UEs camp on cells

with good RX signal levels and qualities

In the idle mode, UE can perform:

PLMN selection

Cell selection & reselection

System message receive

TA update

Paging receive

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Idle Mode Overview

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Contents


2. PLMN selection

3. Cell selection & Cell Reselection

4. System information reception

5. Tracking area registration

6. Paging monitoring procedure

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PLMN Selection

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PLMN Selection

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Contents


2. PLMN Selection

3. Cell Selection & Cell Reselection

4. System information reception

5. Tracking area registration

6. Paging monitoring procedure

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Cell Selection and Reselection

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Cell Search

Slot synchronization

Frame synchronization andPCI identification

Reference signalmeasurement and BCH

decoding

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Cell Search

Device can identify Cell ID andframe timing

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Cell Selection

Criteria for cell selectionSrxlev > 0 and Squal > 0

Srxlev = Qrxlevmeas - (Qrxlevmin + Qrxlevminoffset) PcompensationSqual = Qqualmeas (Qqualmin + Qqualminoffset)

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Cell Selection Configuration

MOD CELLSEL

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Cell Selection Configuration

MOD CELLRESEL

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Cell Reselection Procedure

The signal strength of both serving cell and neighboring

cells varies with the movement of a UE and so the UE

needs to select the most suitable cell to camp on. This

process is called cell reselection

Cell reselection process:

Measurement start criteria

Cell reselection criteria

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Intra Frequency Measurement

If the intra frequency measurement triggering threshold is

not configured, the UE performs intra frequency

measurements always.

If the intra frequency measurement triggering threshold is

configured:

Srxlev > SIntraSearch and Squal > SIntraSearchQ the UE

dose not perform intra frequency measurement

Srxlev SintraSearch or Squal SIntraSearchQ, the UE

perform intra frequency measurement

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Priorities of Inter Frequency and InterRAT Cell Reselection

Inter-frequency or inter-RAT measurement is frequency priority based,

depending on relative priority between serving and neighbor cell, UE performs

measurement according to corresponding mechanism

Note: For different frequency cell, we must configure the priority, either be the same or

different, otherwise, the UE can not perform inter-frequency/inter-RAT cell selection

The priorities of inter frequency and inter-RAT are classified into two types:

Absolute priority

Static configuration

Dedicated priority

Temporarily configured by RRC

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Serving Cell Frequency Priority

MOD CELLRESEL

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Inter-Frequency Neighbor Priority

MOD EUTRANINTERNFREQ

Note: if priority indicator is set Not CFG, then eNodeB use

the same priority setting as local cell

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Inter-RAT Neighbor FrequencyPriority

GSM

UMTS

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Timer for Dedicate Priority

MOD RRCCONNSTATETIMER

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Inter Frequency/RAT MeasurementCriteria For the neighbors with higher priority

The UE always perform inter frequency /RAT measurement

For the neighbor with lower or equal priority

If the threshold is not configured, the UE always perform inter

frequency/RAT measurement

If the threshold is configured :

When Srxlev > SNonIntraSearch and Squal > SNonIntraSearchQ, UE

does not perform inter frequency/RAT measurement

When Srxlev SnonIntraSearch or SqualSNonIntraSearchQ UE

perform inter frequency /RAT measurement

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Threshold Configuration for Intra-RAT

MOD CELLRESEL

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Threshold Configuration for Intra-RAT(Cont.)

MOD CELLRESEL

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Intra Frequency/ Equal-Priority CellReselection Criteria

Serving cellNeighbor cell

R_N > R_S

R_N= Qmeas,n CellQoffset

R_S= Qmeas,s + Qhyst

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Intra-Frequency Cell ReselectionRanking

MOD CELLRESEL

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Intra-Frequency Cell ReselectionRanking (Con.)

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High Priority Cell Reselection Criteria

Neighbor cell

Criteria for Rx quality based (only for LTE&UMTS):Squal = Qqualmeas Qqualmin>ThreshXHighQ

No need considerserving cell

Criteria for Rx level based (For all system) :Srxlev = Qqualmeas (Qqualmin + Pcompensation) >ThreshXHigh

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Low Priority Cell Reselection Criteria

Serving cellNeighbor cell

Criteria based on Rx quality (only for LTE & UMTS)Squal_S < ThrshServLowQ andSqual_N > ThreshXLow

Both serving cell andneighbor cell should beconsidered

Criteria based on Rx level (for all system)Srxlev_S < ThrshServLowQ and

Srxlev_N > ThreshXLow

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High Priority Cell Reselection Criteria

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Contents

1. PLMN Selection





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MIB and SIB

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MIB Transmission

PBCH

0 1 7 8 92 3 654Frame

MIB

DL Bandwidth

PHICH Configuration Info

SFN

New message

Repeat message

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SIB1 Transmission

0 1 7 8 92 3 654SFN

SIB1

SIB1:

PLMN Identity List P-Max

Tracking Area Code Frequency Band Indicator

Cell Barred Indication Scheduling Info List

Intra Frequency Reselection SIB Window Length

Qrxlevminoffset

New message

Repetition message

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Other SIBs

SIB2:Common radio parameters used byall the UEs in a cell

SIB3

Common cell reselection parametersfor all the cells and intra-frequencycell reselection parameters

SIB4Intra-frequency neighboring cell list,reselection parameters of eachneighboring cell used for cellreselection, and intra-frequency cellreselection blacklist

SIB5

Inter Frequency Carrier List

Inter Frequency Neighbor Cell List

Inter Frequency Black Cell List

SIB6

Neighbor List for UTRANUTRAN Reselection Info

SIB7

Neighbor List for GERAN

GERAN Reselection Info

SIB8

Neighbor List for cdma2000

cdma2000 Reselection Info

SIB9:Name of the home eNodeB

SIB10Earthquake and Tsunami WarningSystem (ETWS) primary notification

SIB11

ETWS secondary notification

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System Information Reception

A UE reads SI messages in the following scenarios:

The UE is powered on and selects a cell to camp on

The UE reselects a cell

Handover is complete (RRC active status)

The UE enters E-UTRAN from another RAT system

The UE returns to the coverage area from a non-coveragearea

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Spreading Without Permission 2


System Information Update

After obtaining the SI message properly, the UE does

not read the message repeatedly

UE updates the SI message in the following scenarios:

NodeB transmits a notification in paging message to inform UE

SI change or an ETWS message

The UE periodically updates the SI message per 3 hours

The UE receives the SI message 3 hours after receiving an SI

message.

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System Information Update Procedure

eNodeB pages the UE firstly , then transmits the

updated system information in next modification period

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SI Update Period

MOD BCCHCFG

MOD PCCHCFG

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Contents

1. PLMN Selection





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Tracking Area Registration

TA in SIB1:

A UE informs the EPC of its Tracking Area in two ways:

Attach/Detach

TA update

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TA Update

TA updates are performed in the following situations:

The UE detects a new TA

The periodic TA update timer expires

The UE performs reselection to an E-UTRAN cell from another

RAT

The RRC connection is released because of load balancing

The information on UE capabilities stored in the EPC changes

The Discontinuous Reception (DRX) parameters changes

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Contents

1. PLMN Selection





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Trigger of Paging

Triggered by MME

MME initiates a paging message according to the TAL

information in the message, the eNodeB transmits the paging

message over the PCCH to the UE in all the cells belonging to

the TAs in the TAL

Triggered by eNodeB

When the SI message changes, the eNodeB transmits apaging message to notify all the UEs in the EMM-

REGISTERED state in the cell and transmits the updated SI

message in the next SI message modification period

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Paging Mechanism

The SFN of a PF is derived from the following formula:SFN mod T = (T div N) x (UE_ID mod N)

The subframe number i_s of a PO is derived from the following formula:

i_s =Floor (UE_ID/N) mod Ns

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Paging Discontinuous Reception



N_s = (UE_ID/N) mod Ns

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microsoft powerpoint - oeo106010 lte eran6.0 idle mode behavior issue 1

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