1 lte eran6.0 idle mode issue1.00
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8/12/2019 1 Lte Eran6.0 Idle Mode Issue1.00
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Copyright 2013 Huawei Technologies Co., Ltd. All rights reserved.
LTE eRAN6.0 Idle Mode
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Copyright 2013 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. UE Idle Mode Overview
2. PLMN Selection Procedure
3. Cell Search & Selection Procedure
4. Cell Reselection Procedure
5. Cell Barring and Reservation
6. Paging Procedure
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General UE Initial Procedure
Page4
BCH decoding (MIB/SIBs)
PSS/SSS decoding
UE eNodeB MME
PLMN register
1.UE selfPLMN
selection
2.Frequencyselection
WhenPower on
UE
3. Cell search (ObtainPCI and get DL sync
If no valid SS, go to step 2
4. Obtain the systemmessage
5. Cell selection
RS measurement
If fails, go to step 26. Initial
Attachment(PLMNregistion)
If fails, go to step 1RRC connected mode
Initial attachement procedure
UE inactive timerexpires
RRC idle modeStart cell reselection
procedure
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UE Idle Mode Behaviors
A UE that is powered on but does not have an RRC connection tothe 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 qualitiesIn the idle mode, UE can perform:
PLMN selection
Cell search & selection
Cell reselection
TA update
Periodic paging monitoring
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RRC Status Transition
LTE is capable with always online functions, after UE initialattach, the default RRC status is active.
There is a timer(UE inactive timer) in eNodeB to control
active to idle transition, when a UE has neither received norsent data for a duration exceeding this period of time, the
eNodeB releases the radio resources for the UE.
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Contents
1. UE Idle Mode Overview
2. PLMN Selection Procedure
3. Cell Search & Selection Procedure
4. Cell Reselection Procedure
5. Cell Barring & Reservation
6. Paging Procedure
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PLMN Classification
Home PLMN: the PLMN which the user is subscribed, thereis only one PLMN
The Equivalent Home PLMN (EHPLMN): It is a list of
PLMNs that can provide the same service as home PLMN.This PLMN is recoded in USIM
Visited PLMN: The Visited PLMN (VPLMN) is the PLMN
where the UE is located.
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PLMN Selection Introduction
PLMN selection includes two stages
UE self-PLMN selection
Automatic selection mode: UE will automatic select one suitable
PLMN based on the priority
Manual selection mode: UE search all the valid PLMN in the
network, and the user could select one of them
PLMN register: After UE select one PLMN, it will register it to
EPC during attachment flow, if this procedure is failure, UEgoes back to self PLMN selection procedure. If all PLMN
registration fails, UE enters the limited service state
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PLMN Selection Procedure
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Priority of Automatic PLMN Selection
Scenario 1: Initial PLMN selection, with no RPLMN information
UE AS initiate cell search, read all the PLMN from SIB1, and
report it to UE NAS
UE NAS will select one of them based on the predefined priority
Scenario 2: If last VPLMN exists in USIM, UE will select this
PLMN and start cell search with last frequency, if no valid cell was
found all PLMN registration fails, then UE goes back to initial
PLMN selection
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Contents
1. UE Idle Mode Overview
2. PLMN Selection Procedure
3. Cell Search & Selection Procedure
4. Cell Reselection Procedure
5. Cell Barring & Reservation Operation
6. Paging Procedure
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Cell Search Procedure
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Slot synchronization
Frame synchronization andPCI identification
System message receptionand RS measurement
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SS Search
Page14
Subframe
Correlation
PSS 0
PSS1
PSS 2
Device can identify Cell ID andframe timing
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System Message Reception
After SS decoding, UE turns to BCCH logic channelacquires all the necessary information for the further
network access and operation.
Classification of system messageMIB(Master Info Block): There is only one MIB, is carried by
PBCH
SIB: Up to 13 SIBs can be delivered by PDSCH, SIB1 and
SIB2 are mandatory
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MIB Introduction
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MIB (Master Information Block)DL-Bandwidth (6, 15, 25, 50, 75, 100)PHICH Configuration (Ng and Normal/Extended)System Frame Number One frame (10 ms)
: BCH
: PrimarySynchronizationSignal
: SecondarySynchronizationSignal
1st slot 2 nd slot
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SIB Information
Page17
Type Contents
SIB1 Cell selection and camp related parameters SI period for otherSIBs.
SI
SIB2 Basic radio parametersSIB3 Common parameters for cell reselection
SIB4Intra-frequency neighbor list; Neighbor reselection parameters;Neighbor black list
SIB5
Inter-frequency list and corresponding cell reselection
parametersInter-frequency neighbor list and corresponding cell reselectionparametersInter-frequency black list
SIB6 UMTS frequency list and neighbor list
SIB7 GSM frequency list and neighbor list
SIB8 CDMA2000 frequency list and neighbor list
SIB9 Home eNodeB informationSIB10 ETWS primary notificationSIB11 ETWS secondary notification SIB12 CMAS primary notification SIB13 CMAS secondary notification
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SIB Mapping & Delivery
SIBs are mapping on PDSCH: SIB1 and SIB2 aremandatory, and others are optional.
Period of SIBs
SIB1: 80ms
From SIB2 to SIB8, SIB10 and SIB11: It is a flexible period,
with 80,160,320,1280,2560 and 5120ms .
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SI Mapping Configuration
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Initial System Message ReceptionScenario
A UE reads the first SI messages in the following scenarios:
After cell search
After UE reselect a new cell
After handover in a new cell
UE returns to coverage area from non-coverage area
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System Message Update Scenario
After obtaining the SI message properly, the UE does notread the message repeatedly. It rereads and updates the SI
message only in the following scenarios:
The UE receives the SI message change notification in thepaging message
The UE receives the SI message 3 hours after receiving an SI
message
The UE receives the ETWS message broadcast notification in
the paging message transmitted from the eNodeB.
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System Information Update Procedure
eNodeB pages the UE firstly , then transmits the updated systeminformation in next modification period
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RS Measurement
After receiving all necessary system messages, UE start tomeasure RS for cell selection and reselection
The following quantity should be evaluated for UE idle
status measurementRSRP: RS receiving power
RSRQ: RS receiving quality
RSRQ= N *RSRP/RSSI (N indicates the number of RS RE inone sysmble)
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Cell Selection Criteria
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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 ( Cont .)
MOD CELLRESEL
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Contents
1. UE Idle Mode Overview
2. PLMN Selection Procedure
3. Cell Search & Selection Procedure
4. Cell Reselection Procedure
5. Cell Barring & Reservation
6. Paging Procedure
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Cell Reselection Introduction
The signal strength of both serving cell and neighboringcells 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 which is considered as UE
mobility management in idle mode
Cell reselection process:
Measurement start criteria
Cell reselection criteria
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Frequency Priority Handling forMeasurement
For intra-frequency neighbor measurement: The priority isthe same between source cell and neighbor cell, so UE will
ignore it.
For inter-frequency and inter-RAT neighbor measurement:UE will take the priority between source cell and neighbor
cell for the measurement
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Priority Setting
The priorities of inter frequency and inter-RAT areclassified into two types:
Absolute priority
Static configuration
Dedicated priority
Temporarily configured by RRC for some the
dedicated UE.
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Absolute Priority Configuration Serving Cell
MOD CELLRESEL
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Absolute Priority Configuration EUTRAN Target Cell
MOD EUTRANINTERNFREQ
Note: if priority indicator is set Not CFG , then UE doesnt
implement cell reselection to the target frequency
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Absolute Priority Configuration UTRAN/GERAN Target Cell
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GSM
UMTS
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Dedicated Priority For Flexible UserSteering
If flexible user steering feature is activated, we can set thededicated priority based on subscriber profile ID, and valid
duration is 180 min.
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Dedicated Priority For RAN Sharing
You can configure dedicated priority for RAN sharing witheither of following solution
Solution 1: Set dedicated priority for UE select different PLMN
operators. This priority will be shared by all operators in the
serving cell.
Solution 2: Set dedicated priority for all operators in the
serving cell with a specific frequency. This priority is individual
for each operators in serving cell
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Solution 1 Introduction
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Operator 1
Operator 2
Operator 3
Source cellTarget cell
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Relevant Configuration
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Solution 2 Introduction
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Operator 1
Operator 2
Operator 3
Source cellSpecific
Target cell
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Relevant Configuration
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Intra-Frequency Measurement Criteria
If the intra frequency measurement triggering threshold isnot configured, the UE always performs intra frequency
measurements.
If the intra frequency measurement triggering threshold isconfigured:
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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Inter Frequency/RAT MeasurementCriteria
For the neighbors with higher priorityThe 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 interfrequency/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 Squal SNonIntraSearchQ UE
perform inter frequency /RAT measurement
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Threshold Configuration Rx Level
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Threshold Configuration Rx Quality
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Black List
During cell reselection, UEs are not allowed to measure orreselect the blacklisted cells of the serving cell.
Intra-frequency blacklist : Broadcast in SIB4
Inter-frequency blacklist: Broadcast in SIB5
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Intra-Frequency Cell ReselectionConfiguration -Hysteresis
MOD CELLRESEL
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Intra-Frequency Cell ReselectionConfiguration - Cell Offset
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High Priority Cell Reselection Criteria
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Neighbor cell
Criteria for Rx quality based (only for LTE&UMTS) :Srxlev = Qqualmeas Qqualmin> ThreshXHighQ
No need consider
serving cell
Criteria for Rx level based (For all system) :Squal = Qqua lmeas (Qqualmin + Pcompensation) > ThreshXHigh
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Low Priority Cell Reselection Criteria
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Serving cell Neighbor cell
Criteria ba sed on Rx quality ( only for LTE & UMTS)Squal_S < ThrshServLo w Q andSqual_N > ThreshXLow
Both serving cell andneighbor cell should beconsidered
Criteria bas ed on Rx level (fo r all system)Squal_S < ThrshServLo w Q andSqual_N > ThreshXLow
http://d/LTE/eRAN3.0/lte/para/CellResel-ThrshServLowQ.htmlhttp://d/LTE/eRAN3.0/lte/para/EutranInterNFreq-ThreshXlow.htmlhttp://d/LTE/eRAN3.0/lte/para/CellResel-ThrshServLowQ.htmlhttp://d/LTE/eRAN3.0/lte/para/EutranInterNFreq-ThreshXlow.htmlhttp://d/LTE/eRAN3.0/lte/para/EutranInterNFreq-ThreshXlow.htmlhttp://d/LTE/eRAN3.0/lte/para/CellResel-ThrshServLowQ.htmlhttp://d/LTE/eRAN3.0/lte/para/EutranInterNFreq-ThreshXlow.htmlhttp://d/LTE/eRAN3.0/lte/para/CellResel-ThrshServLowQ.html -
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Contents
1. UE Idle Mode Overview
2. PLMN Selection Procedure
3. Cell Search & Selection Procedure
4. Cell Reselection Procedure
5. Cell Barring & Reservation
6. Paging Procedure
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Cell Barring & Reservation
Cell barring and reservation control are two mechanisms foroperators to control their networks.
It is only used to control the cell selection and reselection for
idle UE
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Relevant UE Behavior
If a cell is neither barred nor reserved for operator use, UEscan consider this cell as a candidate during cell selection
and reselection procedures.
If a cell is not barred but is reserved for operator use, UEstreat this cell during cell selection and reselection
procedures as follows:
If UEs of access class 11 or 15 camp on their HPLMN or an
EHPLMN, the UEs can treat this cell as a candidate.
Otherwise, UEs treat this cell as a barred cell
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Relevant UE Behavior ( Cont .)
If a cell is barred, UEs behave as follows during cellselection and reselection procedures:
The UEs cannot select or reselect this cell
When intraFreqReselection in the SIB1 indicates that intra-frequency reselection is allowed, the UEs may select another
cell on the same frequency if reselection criteria are fulfilled.
Otherwise, UE cant reselect the other cell.
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Contents
1. UE Idle Mode Overview
2. PLMN Selection Procedure
3. Cell Search & Selection Procedure
4. Cell Reselection Procedure
5. Cell Barring & Reservation
6. Paging Procedure
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Trigger of Paging
Triggered by MMEMME 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 a
paging 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
PF: Paging frame, in one paging cycle , there could be many
paging frames, depends on NB configuration
PO: Paging occasion, is the paging subframe for each UE, the PFand PO is assigned by eNodeB using hash algorithm based on
IMSI
The PO number = NB x TPage57
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Paging Channel Configuration
MOD PCCHCFG
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Summary
What is UE behaviors in idle mode?What is priority for PLMN selection?
How to perform cell search?
What is criteria for cell selection?
And how about cell selection?
How to configure paging channel capacity?
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