04_Inter Layer Mobility.pptx

Inter Layer Mobility Semaran Sema rang, g, 03 February February 2016

For internal use

Introduction to Inter-layer Mobility Connected mode 4G to 3G Idle mode 4G-3G, 3G-4G LTE F1 to LTE F2 Connected, idle

3G F1 to 3G F2 Connected, idle

LTE

WCDMA

Connected mode 3G-2G, 2G-3G Idle mode 2G-3G, 3G-2G

GSM

4G Connected mode to 2G Idle mode 4G Idle Idle mode mode to 2G Idle mode mode

For internal use

Index • • • •

Introduction to Inter layer Mobility Priority Layer Concept Idle Mode Mobility from LTE

Connected Mobility from LTE

For internal use

3GPP 3G PP Prio Priorit rity y Lay Layer er Concep Conceptt RAT_4 f_2

• 3GPP Rel8 introduces absolute priorities for RF carriers

RAT_3 f_1

RAT_2 f_2

RAT_2 RAT_2 f_1 f _1

• Each carrier can be assigned a priority • Range from 0 (lowest prio) to 7 (highest prio) • Carrier priorities are broadcast from serving cell BCCH • eUTRAN : SIB3, SIB5, SIB6, SIB7, SIB8 • UTRAN: SIB19 • GERAN: SI2quater  • Priorities can also be signaled directly within

RAT_1 f_2

RRC connection release message; RRC Timers

control validity of prio information RAT_1 RA T_1 f_1

• eUTRAN: T320; UTRAN: T322; GERAN: T3230

The 3GPP priority concept could be considered an extension and generalization of internal use theFor3G-specific HCS concept

Priority Layer Concept in LTE • Cell reselection between different LTE frequencies and different RATs is based on priorities

• Priorities could be configured for each LTE frequency (including serving cell) and for each frequency of each RAT

• Priorities are provided to UE via system information • Equal priorities are not applicable for inter-RAT cell reselection • UE performs only cell reselection evaluation for inter-LTE frequency f requency and inter-RAT carriers for which the UE has a priority

• UE is camped on a cell c ell which defines the priorities for the other network layers • The range of absolute priorities is 0..7 (0 is the lowest priority ) LNCEL: cellReSelPrio

 Absolute priority of the serving cell

IRFIM: eutCelResPrio  Absolute priority of EUTRA EUTRA carrier frequency UFFIM: uCelResPrio

 Absolute priority of the UTRA UTRA carrier frequency

GNFL: gCelResPrio

 Absolute priority of the GERAN GERAN carrier frequency

CDFIM: hrpdCResPrio

 Absolute priority of the CDMA2000 CDMA2000 HRPD carrier frequency

CDFIM: rttCResPrio

 Absolute priority of the CDMA2000 CDMA2000 1xRTT 1xRTT carrier frequency

For internal use

3GPP 3G PP Prio Priorit rity y Lay Layer er Concep Conceptt LTE has has higher higher priority priority than than WCDM WCDMA: A: UE starts WCDMA measurements measurements when LTE f1 absolute priority = 5

LTE f1 RSRP is -115 dBm 2. For a time time UFFI UFFIM: M:tRe tResUt sUtra ra = 1s 3. AND more more than 1 s has elapsed elapsed since since the UE camped in the current cell

Measurements Trigger  – Inter-frequency and InterRAT (1/2)

sNonIntrsearch LNCEL; 0..62dB; 2dB; -

For internal use

Index • • • •

Introduction to Inter layer Mobility Priority Layer Concept Idle Mode Mobility from LTE Connected Mobility from LTE

For internal use

Measurement Concept (1/2)

RSRP 

RSRP 

RSRP   A3 trigger 

 A2 trigger   A2  trigger 

 A5 thold  A5  thold 2   A3 offset 

 A2 threshold   A2  threshold  RSRP serving  move direction

For internal use

 A5 trigger   A5  trigger 

RSRP serving  move direction

 A5 thold  A5  thold 1 RSRP serving  move direction

Intra RAT HO events  A1 -> Serving cell becomes becomes better than threshold   A2 -> Serving cells becomes becomes worse than threshold  A3 -> Neighbour Neighbour becomes offset better than serving  A4 -> Neighbour Neighbour becomes better than than threshold  A5 -> Serving becomes worse than threshold 1 & neighbour becomes better than threshold 2 

For internal use

Measurement Concept (2/2) Signal Level  B2 trigger  B2  trigger  B2 thold B2  thold 2 

Inter-RAT Neighbor cell signal  B2 thold B2  thold 1

RSRP serving  move direction

• Inter-RAT Inter-RAT measurements (GERAN or UMTS supported s upported in RL30) • RSRP  RSRP or  or RSRQ RSRQ as event-triggering & reporting quantity for LTE LTE serving cell • For Inter-RAT reports trigger RSSI is used in case of GERAN and CPICH RSCP or CPICH EC/N0 in case of UMTS • Event B2: Serving cell`s RSRP downcrossing threshold 1, while neighbor cell RSSI or CPICH RSCP or CPICH Ec/No upcrossing threshold 2 For internal use

Inter RAT HO events

Event B1 -> Inter RAT neighbour becomes better than threshold

Event B2 -> serving becomes worse than threshold 1 and neighbour becomes better than threshold 2

For internal use

Measurement Activation radio coverage by RSRP decreases RSRP Thre Th resho sholld2GE RA N

Intra-frequency & Int I nterer frequenc  fr equencyy & GE R AN & UMTS UMTS measurements

Thre Th resho sholld2Wcd Wcdm ma

Threshold2InterFreq

Intra-frequency  Intra-frequency  & Int I nterer& Int I nterer frequenc  fr equencyy &  fr equency   frequenc y  measurements UMTS

Threshold1 (reported)

Intra frequenc  fr equency  y  measurements only

No neighbors measurements except the serving cell

measurements

Assumptions* for this example: Threshold2GERAN < Threshold2Wcdma < Threshold2InterFreq< Threshold1 threshold2InterFreq

threshold2GERAN

threshold2Wcdma

Trigger for inter-frequency measurements

Trigger for GERAN measurements

Trigger for W CDMA measurements

LNCEL; 0..97dB; 1dB; -

LNCEL; 0..97dB; 1dB; -

LNCEL; 0..97dB; 1dB; -

* Please note that this is an example only. only. The priority of the measurements For internal use activation could be set-up by using the appropriate threshold settings

Confidential

Connected Mode

Intra and Inter-frequency Handovers

Trigger: RSRP below Thresholdx

Threshold1

Threshold2InterFreq

-50 dBm

Only Serving Cell Measurement

-100 dBm

UE measure intra Frequency Neighbors

UE measure inter Frequency Neighbors

UE stops to measure intra Frequency Neighbors -80 dBm Threshold2a

Threshold3 -116 dBm

UE perform HO Neighbor 

Threshold4 -140 dBm

UE perform HO to inter Freq Neighbor 

-120 dBm Threshold3aInterFreq

Trigger: RSRP above Thresholdxa

For internal use

Threshold3InterFreq -122dBm

RRC Release with Redirect

Confidential

Connected Mode IRAT WCDMA Handovers

Trigger: RSRP below Thresholdx

Threshold1

Threshold2InterFreq

-50 dBm

Only Serving Cell Measurement

-100 dBm

UE measure intra Frequency Neighbors

UE measure inter Frequency Neighbors

UE stops to measure intra Frequency Neighbors -80 dBm Threshold2a

Trigger: RSRP above Thresholdxa

For internal use

Threshold3 b2Threshold1UTRA -124dBm -116 dBm UE measure WCDMA Neighbors

UE perform HO to WCDMA Neighbor 

Threshold4 -140 dBm

RRC Release with Redirect

HO to WCDMA Source eNB

UE

Target RNC

MME

S-GW

SGSN

RRC: RRC Connection Reconfiguration (LNCEL: A1, A2 & LNHOW: B2 thresholds 1 & LNADJW: WCDMA frequency & scrambling code )

2

Measurements activation/deactivation of WCDMA based on A2/A1 events. UE measurement reports triggered by event B2

3

RRC: Measurement Report (target W CDMA cells) cells)

4

Decision to perform WCDMA HO S1AP: Handover Required (LNADJW: target WCDMA cell)

5

Handover Preparation S1AP: Handover Command

RRC: Mobility From EUTRA Command 6

For internal use

S1AP: S1 Application Part Protocol

P-GW

Redirection from LTE to WCDMA •  Another mobility mobility from LTE to WCDMA WCDMA is Redirection. Redirection. With redirection, LTE RRC connection is released with target RAT information. Ue Released from LTE , than go idle mode in WCDMA

[..]

RRC: MEASUREMENT REPORT

RRC: RRC CONNECTION RELEASE target RAT indicated

For internal use

event A2 for redirection

CS Fallback to UTRAN No CS domain in Evolved Packet System (EPS) eNB LTE

NB WCDMA

eNB

UE

E-UTRAN attached UEs request CS voice service

UEs must be redirected / handed over towards other Radio Access Technology (RAT) that provides CS-domain services • CS Fallback MME

RRC: S1AP: UL NAS TRANSPORT (Extended Service Request)

S1AP: (CS Fallback Indicator)

For internal use

22

CS Fallback

MME / eNB

MO UE

RNC

Extended Service Request (MO CSFB)

Start MO call ESR Procedure

RRC Connection Setup Procedure

RRC Connection Release (with UARFCN)

  n   o    i    t   a   r   u    D   p   u    t   e    S    l    l   a    C    B    F    S    C    O    M

UMTS  Acquisition

UMTS cell acquisition < Status: Status: UMTS Cell Acquired >

UMTS SIB Read Time

SIB reading < Status: C amped amped on UMTS C ell >

UE time to Send RRC Connection Request

RRC Connection Request

NW RRC

UMTS Call Setup Duration

UE UMTS Service Req.

( = RRC & NAS Procedures on UMTS)

RRC Connection Setup

(Location Update Procedure) CM Service Request CC Setup

UMTS NAS CC Call Proceeding CC Alerting

For internal use

MSC

Plihara Persatuan, Menangkan Persaingan, Jayalah Indonesia, Jayalah Telkom Indonesia

For internal use