Microsoft PowerPoint - OEO106010 LTE eRAN6.0 Idle Mode Behavior ISSUE 1
Transcript of Microsoft PowerPoint - OEO106010 LTE eRAN6.0 Idle Mode Behavior ISSUE 1
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LTE eRAN2.1 Idle Mode Behavior
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Copyright 2013 Huawei Technologies Co., Ltd. All rights reserved.
LTE eRAN6.0 Idle ModeBehavior
Copyright 2013 Huawei Technologies Co., Ltd. All rights reserved.
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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LTE eRAN2.1 Idle Mode Behavior
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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
1. Idle Mode Overview
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
1. Idle Mode Overview
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
2. Cell Selection & Reselection
3. System Information Reception
4. Tracking Area Registration
5. Paging Monitoring Procedure
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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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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
2. Cell Selection & Reselection
3. System Information Reception
4. Tracking Area Registration
5. Paging Monitoring Procedure
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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
2. Cell Selection & Reselection
3. System Information Reception
4. Tracking Area Registration
5. Paging Monitoring Procedure
Page44
Copyright 2013 Huawei Technologies Co., Ltd. All rights reserved.
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
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:
N_s = (UE_ID/N) mod Ns
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Paging Discontinuous Reception
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:
N_s = (UE_ID/N) mod Ns
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Paging Discontinuous Reception
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:
N_s = (UE_ID/N) mod Ns
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