KRnet 2008

IT R&D Global LeaderIT R&D Global Leader

Network Technologies for Network Technologies for Mobile Research Activites of ETRIMobile Research Activites of ETRI

gIMT_Advanced(3GPP LTE Based)

gIMT_Advanced(3GPP LTE Based)

2008. 6.24.2008. 6.24.

(3GPP LTE Based)(3GPP LTE Based)

송송 평평 중중pjsong@etri.re.krpjsong@etri.re.kr

KRnet 2008- 1 -

Topics Topics Topics Topics Topics Topics Topics Topics

I. 3.9G 네트워크 기술의 핫 이슈네트웍 컨버젼스를 위한 eMobility네트웍 컨버젼스를 위한 eMobility

방.통 융합을 위한 eMBMS

유.무선 통합을 위한 Home Cell

II. 4G 네트워크 핵심 요소 기술 전망IMT-Advanced Issues

4G 네트워크 핵심 요소 기술

III. Concluding Remarks

KRnet 2008- 2 -

Terminology Terminology

Terminology

gygy

Terminology IMT-Advanced = 4G = SB3G (Systems Beyond IMT-2000) = B3G

LTE : Long-Term Evolution (RAN part, 3.9G)

SAE : System Architecture Evolution (CN part)SAE : System Architecture Evolution (CN part)

EPS : Evolved Packet Service (LTE + SAE)

eNodeB : evolved NodeB

MME : Mobility Management Entityy g y

S-GW or P-GW : Serving GateWay or PDN GateWay

EPC : Evolved Packet Core (for Core Network)

EUTRAN : Evolved UTRAN (for Access Network)

3GPP : 3rd Generation Partnership Project

UE : User Equipment

KRnet 2008- 3 -

1. 3.9G 네트워크 기술의 핫 이슈1. 3.9G 네트워크 기술의 핫 이슈(3GPP LTE Tech. for NW Convergence)

네트웍 컨버젼스를 위한 eMobility

방 통 융합을 위한 eMBMS방.통 융합을 위한 eMBMS

유.무선 통합을 위한 Home Cell

COST COST 절감을절감을 위한위한 Flat ArchitectureFlat Architecture

3GPP Long Term Evolution. VoD Ftp

3GPP Long-Term EvolutionVision : “Future-oriented radio access system” toward IMT-Advanced (4G)

P bli I t t

IP Phone

Server ServerWeb

Server

Architecture : Flat-arch. & Open interfaces (S1/X2/Uu/O&M) with Inter-RAT Mobility

Technology : Full-IP based cost-EPC

Public Internet

Technology : Full IP based costeffective system thru optimized radio and simplified network

Service : True “quadruple play”(IP voice high-speedplay (IP voice, high-speed interactive (gaming), large data transfer, mobile IP-TV)

Standard : Draft in 2007 (Rel.8), d C i l d t ft

EUTRAN

and Commercial product after 2010!

Cost-saving factors:

AN > RNC 제거 CN > Circuit 장비 제거 UE

KRnet 2008- 5 -

AN -> RNC 제거, CN -> Circuit 장비 제거 UE

네트웍네트웍 컨버젼스를컨버젼스를 위한위한 eMobilityeMobility

How to achieve network convergence in heterogeneous env.?I t RAT bilit ! > Al b t ibl f k th NW

• . Optimized HO procedure

Inter-RAT mobility! => Always best accessible framework thru NW convergence!

Interworking architecture

(1) Pre-registration

(2) HO Execution

타겟시스템 선택 알고

PCRF

HSS

Wx*

Rx+S7c

S6a

WCDMA

리즘 : ANDSF

인터워킹 방법 : No translator (터널링 & 인캡술레이션)

SGi

S7Operator's IP

Services (e.g. IMS, PSS

etc )

S6

Rx+

PDN Gateway

S5

3GPPAccess

Serving Gateway

PMIP 인캡술레이션)

(3) HO Completion

S2b

Wn*

Wm*

HPLMN

S6c

ePDG 3GPP AAA Server

S7b

S2a

S

PMIPLTE

Untrusted Non-3GPP IP

Access Wa*

Non-3GPP Networks

S7a

Trusted Non-3GPP IP

Access Ta* UE

Wu*

Mobile

Inter-RAT mobility =>

S-GW/P-GW를 통한 이종 액세스

네트워크간 컨버젼스 구현 기술 !

KRnet 2008- 6 -

WiMAX WLAN네트워크간 컨버젼스 구현 기술 !

네트웍네트웍 컨버젼스를컨버젼스를 위한위한 eMobilityeMobility

Public InternetInter-RAT mobility (LTE->WCDMA)

HO use casesLTE 셀의 트래픽 폭주

LTE 셀의 신호간섭 증대

LTE (RAT-A ) WCDMA (RAT-B )

(12) UPDATE BEARER REQ

PDN-GW

LTE 셀의 Partial deployment

SGSN

13) PATH SW

PACKET FORWARDING(eNB NB via SGW)

(0) Current Path

(13) UPDATE LOCATION, etc

Serving -GW

MME (4) FWD RELOCATION REQ

(6) FWD RELOCATION RESP

(11’) FWD RELOCATION COMPLETE

HO proceduresHO Preparation Ph.(1-6)

(3) HO

REQUIRED

(11) RELOCATION COMPLETE

UTRANRNC

E-UTRAN

(5/5a) RELOCATION

REQUEST/ACK

(7) HO CMD

(11’) RELEASE

RESOURCE

HO Execution (7-9)

HO Completion (10-13)(2)

TargetSelection

NBeNBRRM

(8) HO COMMAND (10) HO CONFIRM

KRnet 2008- 7 -

Handover

(1) MEASUREMENT

(9/9a) Target Access :(RF/BB SW )

HO COMMAND (10) HO CONFIRM

네트웍네트웍 컨버젼스를컨버젼스를 위한위한 eMobilityeMobility

HO time & Interruption time (Inter-RAT : LTE WCDMA, 추정치)Total HO time : 208ms ( ~ ) where only up to 10(6) data packets are forwarded

# 55# 46 # 52# 50# 49# 4# 47 # 53 # 54 # 56 # 57 # 58 # 59 # 61# 60# 51 # 62e

Total HO time : 208ms ( ~ ), where only up to 10(6) data packets are forwarded

HO interruption time : max 140 ms for non rt-traffic

# 55

aGW# 46 # 52# 50# 49# 4# 47 # 53 # 54 # 56 # 57 # 58 # 59 # 61# 60# 51 # 62

tenc

y p

rofile

eNodeB

RNC

4 packets (#52-#55) cannot be transmitted to the UE before completion of synchronization with target cell

data

flow lat

UE~ 140 msD

ownlink

d

time [s]

# 52to # 55

208 ms

# 46 # 47 # 48 # 49 # 50 # 51 # 56 # 58# 57 # 59 # 60

"Measurement Report" sent by UE to source eNodeB / RNC"HO Command" sent by source eNodeB / RNC to UE

KRnet 2008- 8 -

HO Command sent by source eNodeB / RNC to UE"HO Complete" received by target RNC / eNodeB from UE"Path Switch" performed at aGW

Source : 3GPP

140ms! => Seamless handover!

방방..통통 융합을융합을 위한위한 eMBMSeMBMS

Definition of MBSFNSFN concept is introduced for efficient MBMS operations

An MBSFN area consists of “a group of tightly synchronized cells” where all cells are using the same radio resources in the same f b d t h l t it id ti l MBMS d tfrequency band to synchronously transmit identical MBMS data

Definition of MBMS area

KRnet 2008- 9 -

MBSFN : Multicast/Broadcast Single-Frequency Networking

방방..통통 융합을융합을 위한위한 eMBMSeMBMS

MBMS f tieMBMS functionsMBMS GW (~EPC)

SYNC protocol to each eNB

MBMS S i C t l

• c Logical Architecture for eMBMS

Contents Provider

MBMS Session Control Signaling (Session start/stop) towards the eNB

MCE (Multicast Cordination Entity)

BM-SC

GW

PGW

MBMS service distribution (MCE)

MBMS Tx cordi

eNodeB

~aGW

MME~eNodeB

MBMS scheduling

MBMS Tx & Rx

MBMS Radio bearer control

Further issues

RRM : Efficient resource management for unicast…

KRnet 2008- 10 -

방방..통통 융합을융합을 위한위한 eMBMSeMBMS

MBMS Deployment Scenarios

ScenarioTransmission

(SFN )

Carrier

(F l )

Radio

BComments

Mixed Carrier : 통신과 M-IPTV 동시 서비스

Scenario(SFN ) (Feq. layer) Bearer

Comments

S-D Single-Cell

(SFN)

Dedicated-carrier

(MBMS only)

p-t-m Specific-cell에서 “only MBMS”단일 전송

-Single-cell (No SFN operation)

. Soft combining & Synch tx 모두 가능 안함

-Dedicated-carrier (belong to Freq-layer)1

-Dedicated-carrier (belong to Freq-layer)

. MBMS 서비스만 가능 (unicast data 전송은 불가)M-M Multi-Cell

(No SFN)

Mixed-

Carrier

(MBMS +

p-t-m “Unicast & MBMS” mixed transfer in Multi-cell-Multi-cell (SFN operation)

Soft combining & Synch tx available2 (MBMS

Voice/Data). Soft combining & Synch tx available

- Mixed-carrier

. MBMS/Unicast

. Dual Receiver (Mobile TV & VoIP)

2

* RB (p-t-p) : not used

MBMS p-t-m Transmission scenarios in E-UTRAN RB (p t p) : not used

Soft combinig at the cell boundary

12

KRnet 2008- 11 -

유유..무선무선 통합을통합을 위한위한 HomeHome--cell cell

3G Home eNB scenario in 3GPP Basic concept of Home peNB

Home/Office/Campus 등에서사용 가능한 초소형 기지국

이동성 (M bilit ) 품질 통

C

HIGHER NETWORK NODE

이동성 (Mobility), 고품질 통신 서비스 (QoS), 강력한 통신 보안 (Security), Closed Subscriber Group (CSG), SON 및 홈게이트웨이 (t ffi

A

B

LTE MACRO CELLOTHER 3GPP SYSTEM

D

HeNB and HeNB GW scenario (tbd)및 홈게이트웨이 (traffic-concentration) 등이 주요기술

Benefit : Indoor-cell, Single-modem, and Full cell-capacity

차세대 유.무선 통합서비스

수익 모델!

KRnet 2008- 12 -

Source : 3GPP

유유..무선무선 통합을통합을 위한위한 HomeHome--cell cell

I t f i (UTRAN) S t t f EUTRANInterference scenarios (UTRAN) Spectrum arrangement for EUTRANNo overlapping of central 6 RBs between HENB Macro NB

=> UE는 home-cell에서 macro eNB> UE는 home cell에서 macro eNB의 신호간섭없이 BCH & SCH 수신

=> Frequency hopping and Frequency dependent scheduling

M i I f H C ll (( )/UTRAN)

Deployment config. (Partial co-channel)

Main Issues of H-Cell ((e)/UTRAN)Architecture for 3G HNB

Inbound /Outbound mobility

CSG white-list configurationCSG white list configuration

HNB/UE registration

HNBAP protocol (HNB-HNBGW)

Function split of HNB-3G HNB-GWHNB

HNB-GW Discovery

HNB (auto)-configuration (SON)

표준화 : SA1/2/3/5, RAN2/3/4, CT1

freqMacro

BCHSCH

KRnet 2008- 13 -

Source : 3GPP

2 IMT Advanced Issues2. IMT-Advanced Issues

LTE vs. LTELTE vs. LTE--AdvancedAdvanced

LTE : LTE-Advanced : IMT-Advanced

Future

ITU R REQ’T

LTE-AdvancedPhysical-

domainAdvanced

Capabilities for Ph i l l ITU-R REQ T

Network-

domain

Physical-layer

AdvancedLTE

(Essential Capabilities)

Advanced Capabilities for Network

( p )

KRnet 2008- 15 -

LTELTE--Advanced RequirementsAdvanced Requirements

항목 세부 항목 LTE LTE-Advanced( )1. Capability

(max value)Peak Data Rate(system target view)

DL : 300Mbps (4x4, 64QAM)UL : 75Mbps (1x2, 16QAM)

DL : 1GbpsUL : 500Mbps

Latency (C-plane)(w/o S1 interface & unloaded)

Idle-Active : 100msDormant(DRX)-Act : 50ms

Idle-Active : 50msDormant(DRX)-Active : 10ms

Latency (U-plane) 10ms (one-way at IP layer) Less than LTE

C-plane Capacity 200 active users /5 MHz 300 active users /5 MHz

2. System performance

Peak spectrum efficiency(error-free single UE)

DL : 15 bps/Hz UL : 3 75 bps/Hz

DL : 30 bps/Hz (8x8)UL : 15 bps/Hz (4x4)performance

(max value)(error-free, single UE) UL : 3.75 bps/Hz UL : 15 bps/Hz (4x4)

Average spectrum efficiency(higher priority)

DL : 3~4 * HSDPAUL : 2~3 * HSDPA

DL : 2.6 (4x2) or 3.7 (4x4)UL : 2.0 (2x4)

Cell edge spectrum efficiency( % i D i )

DL : 3~4 * HSDPA* DP

DL : 0.09 (4x2) or 0.12 (4x4)( )(5% point of CDF normalized) UL : 2~3 * HSDPA UL : 0.07 (2x4)

Mobility 350km/h 350km/h (up to 500km/h)

Coverage ~5Km : Best throughput.. LTE are applicable

Further Enhanced MBMS Reuse of L1 Soft combining Better than LTEFurther Enhanced MBMS Reuse of L1,Soft-combining Better than LTE

Network synchronization 시각 동기없이 성능 달성성능 월등하면 동기 제공

LTE are applicable

Spectrum flexibility 1.4, 3, 5, 10, 15 and 20MHz BW

450MHz~4.99GHz내의 6 bandsC ti t f

KRnet 2008- 16 -

BW. Consecutive spectrum for wider BW than 20MHz

Src : 3GPP TR36.913

LTELTE--Advanced RequirementsAdvanced Requirements

항목 세부항목 LTE LTE-Advanced3.Deployment

Deployment Scenarios No backward compatibleFor underground

Backward compatible with LTE Indoor eNB and HNB in aEUTRAN

Co-existence & interworking

3GPP Inter-RAT HO Inter-RAT interworking capability (HO)=> At least same as LTE => Req’t : Inter-RAT HO (LTEA-LTE) =

Intra-LTEA HO

Network Sharing S1-flexiblity S1-flexiblity

4. EUTRAN arch. Cost-eff. & flat arch. Based on E-UTRAN4. Architecture

EUTRAN arch. Cost eff. & flat arch. Based on E UTRANEnhanced local area access

5. RRM Low/high-level RRM end-to-end QoS…. LTE applicable

6. Complexity Adv EUTRA complex. multi-RAT mode, Opt 수 LTE applicable

7. Cost Infra. & terminal Size, weight, battery Low cost & power efficiency

Backhauling S1/X2/RNL optimized Minimized “cost per bit”

SON Mainly for eNodeB Special care for NW sharing & HeNB

eNode B implementation

No “relay” Cost eff. and flexibility for multi-vendor Remote radio units and open interfaces

All Interface Open Interoperability for multi-vendor

8. Service Service-related High-speed Mobile LTE applicable

KRnet 2008- 17 -

8. Service Service rela ed requirements

High speed Mobile Service w/ small latency

LTE applicable To be added (4G specific : U/B/C?)

Src : 3GPP TR36.913

IMTIMT--Advanced IssuesAdvanced Issues항목 세부기술 타겟 사례

1. Architecture

New deployment scenariosaEUTRAN arch for local area access

Relay/ Home-cell의효과적 수용 구조 (cost)

-Architecture aEUTRAN arch. for local area access 효과적 수용 구조 (cost)

2. L1 Band aggregation, advanced antenna, CR..PDR, spectral efficiency, latency,capacity

4G 대역 확보와 스펙트럼 효율 추가 개선 등

-

3 L2 & L3 Advanced MAC scheduling optim-HARQ L2 스케쥴링과 L3 시그 -3. L2 & L3 Advanced MAC scheduling, optim HARQ, Signaling delay optimization…(half)

L2 스케쥴링과 L3 시그널링 개선

4. RRM Common & cooperative RRMOptimized inter-system operation

셀간간섭제어, 셀간/시스템간 부하 제어

DCM

5. Mobility Seamless Inter-RAT mobilityFMC, group mobility…

심리스 핸드오버,그룹 모빌리티

-

6. ICIM Centralized & adaptive ICI managementMulti layering approach (Phy/MAC/RRM)

셀간 효과적 간섭제어 Ericsson, DCMMulti-layering approach (Phy/MAC/RRM) DCM

7. Small Base Stations

Multi-hop relayHome-cell

커패시티/커버리지 개선Indoor, Single modem

Nortel

8 SON Autonomous self-configuration& optimiz 기지국 운용 최적화 및 ALU8. SON(plug & play)

Autonomous self-configuration& optimiz.Standardized multi-vendor SON

기지국 운용 최적화 및운용비용 감소

ALU

9. Applications

ETWS, wireless IPTV, 3D virtual reality..Personal IPTV, CAT, medical IT, D2D

새로운 비지 모델 NEC/NICT

KRnet 2008- 18 -

comm., Cooperative Tx, CO2 emission, etc

10. Others Further optimization of LTE (L1~L3) LTE 기술의 최적화 (Sig.)

3. LTE-Advanced 네트워크의핵심 요소 기술

* Ref : 3GPP LTE, and LTE-Adv W/S (Shenzhen, Apr, 2008)*

Flexible and Scalable Network Architecture

C tiv RRM N tw k Sh iCooperative RRM, Network Sharing

Optimized Multi-RAT Mobility

(Advanced) ICI Management

Nomadic & Local Access Base Station (MHR)Nomadic & Local Access Base Station (MHR)

Autonomous Self Organizing Network

Applications Examples

Slides’ title here

< Ref< Ref > Key Tech. in PHY> Key Tech. in PHY--layerlayer

How to utilize spectrum resource in more flexible and efficient?WINNER project approach ; Spectrum MIMO RelayWINNER project approach ; Spectrum, MIMO, Relay….

KRnet 2008- 20 -

Src : WINNER

(1) Flexible & Scalable Architecture(1) Flexible & Scalable Architecture

How to achieve flexible and scalable access network architecture?> Small base station!

Some architecture issues

EUTRAN to be enhanced with

=> Small base station!

A possible architecture of “LTE based LTE-A”

small base stations (cell coverage & user throughput, ho-delay)

New interfaces (R1 R2)

PublicInternet

HSS PCRF CRRM

New interfaces (R1, R2)

Multi-operator network sharing (S1+ flex)

Unified interface and

AGW

RNC ACRENB

Unified IPUnified IP

Unified IPS1+ flex

Unified interface, and common server (C-RRM) as a network convergence-driver

Multi-RAT terminal (Multi-

RNC

3G+(HSPA Evol)

ENB+

Non-3GPP(e.g. mWiMAX)MHR MHRMHR

HENBHENB

Multi RAT terminal (Multimode, SDR, CR…), etc4G

(LTE Based)

UE(multi-RAT)

MHR : Multi-Hop RelayHENB : Home eNodeBENB+ : Advanced eNodeB (ENB + SGW)AGW : Access GW (MME+PGW)

KRnet 2008- 21 -

AGW Access GW (MME PGW)Xr : Relay-link interface (MHR-ENB)Ur : Radio-link interfcae(MHR-UE)

(1) Flexible & Scalable Architecture(1) Flexible & Scalable Architecture

A possible architecture for LTE-Adv

KRnet 2008- 22 -

(2) Cooperative RRM(2) Cooperative RRM

Cooperative RRM for heterogeneous environments!Current : Distributed RRM > Future : Cooperative RRM

Cooperative RRM For efficient “Always best

• .

Current : Distributed RRM => Future : Cooperative RRM

Concept of Cooperative RRM (e.g, E2E QoS)

CRRM

access”under heterogeneous access networks,

Hybrid-type RRM is expected : “Cooperative RRM in CN, and

RAN-A RAN-B

pDistributed RRM in AN”

R&D issues of high-level RRM Efficient resource management

iQoS Control, Load balancing

System cap. improvement, etc.

R&D issues of low-level RRM Dynamic resource allocation

• .Functions of RRM (e.g, LTE)

Dynamic resource allocation

Link adaptation

Packet scheduling

Multi-user diversity

KRnet 2008- 23 -

y

ICIC, etc

(2) CRRM (2) CRRM -- Load BalancingLoad Balancing

Load balancing mechanism (E.g. handover optimization in LTE)Traffic high density “Cell shrinking” thru HO parameter optimizationTraffic high density Cell shrinking thru HO parameter optimization

Neighbor list optimization, and coverage/capacity control

Problem : Increase of signaling load due to additional interactions

Blocking rate as a function of mobile arrival rate (Copyright © John Wiley & Sons Ltd

Load is balanced between Cell A and Cell C

KRnet 2008- 24 -

* Source : 3GPP

(3) Network Sharing for MVNO(3) Network Sharing for MVNO

Radio access network sharing configurationThe cost for building the radio access network can be shared by the multi-core network operators, thereby reducing the total investments.

Advanced S1-flexiblity is expected for more flexible network sharing scheme i LTE Ad

Impact on S1/X2 interfaces

Impact Handovers

RAN -sharing configuration

in LTE-Adv

Impact on interfaces

Handovers

(LTE to 3G)

Impact

on S1

An eNodeB to be attached to multiple MMEs/S-GW that can beon S1 multiple MMEs/S-GW that can be operated by different core network operators. This would reuse the S1-flex functionality for pooling of core network

i h dresources in non-shared networks.

Impact

on X2X2 interface is internal between eNodeBs in the shared network, no impacts are foreseen on the

KRnet 2008- 25 -

X2 interface

(4) Optimized Multi(4) Optimized Multi--RAT MobilityRAT Mobility

How to implement more optimized network convergence?Non 3GPP mobility with optimized handover procedure!

• . Optimized HO procedureHO Preparation(Pre-registration)

HO Execution

Non-3GPP mobility with optimized handover procedure!

Inter-RAT Vertical Handover CN

HO Execution

타겟시스템 선택 알고리즘 : NW controlled ANDSF, PB-RRM

인터워킹 방법 : 터널링 & 인캡

IP Back-bone

PCRF

Public Internet

HSS

술레이션 (No translator)

HO Completion

Ex: PMIP에 의한 pathswitching

AGW

S101

R-Table PBRM

PCRF

PB RRM

A BMME ACR/ePDG

( )

PB-RRM

eNB

ARAS/AP

3GPP(so e)

3GPP2/WiBro(t t)UE

Handover (A B)

KRnet 2008- 26 -

(source) (target)ModeA ModeB

UE

(5) ICI Management (5) ICI Management

How to coordinate inter-cell interference in LTE? DL & UL resources in a multi-cell environment are coordinated to avoid inter-cell interference by determining which radio resources are scheduled for restriction

* Initial setting

Neighbor 1eNodeB Measurements (examples):• DL total transmitted carrier power• DL resource block transmitted carrier power• DL/UL total resource block usage• DL/UL resource block activity

Neighbor 1Neighbor 1Neighbor 1eNodeB Measurements (examples):• DL total transmitted carrier power• DL resource block transmitted carrier power• DL/UL total resource block usage• DL/UL resource block activity

1) UE measure and report to serving! 2) Serving request status of neighbor 1 & 23) Neighbor 1&2 measure and report4) Serving request “Mute” for co-

interference load imbalances

3

4

A high level procedure for ICIC

Serving

Neighbor 2

• DL/UL resource block activity

Serving

Neighbor 2

Serving

Neighbor 2

Serving

Neighbor 2

• DL/UL resource block activity interference, load imbalances

1. status information(autonomous resources, resources for disposition)

2. Mute Request, Mute Request Accept(‘Please mute/reduce power on Chunk-25, Ref: R1-060586, R1-050763’)

1. status information(autonomous resources, resources for disposition)

2. Mute Request, Mute Request Accept(‘Please mute/reduce power on Chunk-25, Ref: R1-060586, R1-050763’)

12

5

UE Measurements (examples):• UE buffer status• UE power headroom• Transport channel BLER

UE Measurements (examples):• UE buffer status• UE power headroom• Transport channel BLER * Source : 3GPP

KRnet 2008- 27 -

• CQI• CQI

(5) ICI Management(5) ICI Management

C t l it f i t f R t di i t fCentral unit for interference coordination (Ericsson)

Tight scheduling coordination of t i i / ti t

Remote radio equipment for inter-cell orth.(NTT DCM)

Autonomous control : ICIC among ind d t ll i t l itransmission/reception at

geographically separated points

Central Unit (eNB) handling large number of cells

dependent cells using control signals via backhaul (faster than FFR)

Centralized control : ICI management using scheduling at Centralized

=> No impact on E-UTRAN architecture

ICI controller (eNB) connected to RREs via optical fibers

KRnet 2008- 28 -

Src : LTEA Workshop (Ericcson/DCM)

(6) Multi(6) Multi--hop Relaying hop Relaying

How to improve “coverage extension & cell-edge performance”?A solution : Relay station!A solution : Relay station!

Back-haul 사용없이 기지국 신속 건설 (Wireless connection)

K d t f R l SA d l f lti h l. Key advantages of Relay S.To enable cost-effective and seamless ubiquitous service by extending carrier network

A model of multi-hop relay

gdeployment into indoor space

Functionality MR-BS : Management of RSs

RS : Fixed type or mobile type

Type of Relay StationL1 Relay (repeater) : 증폭 송신/ d l 무시delay 무시

L2 Relay : 데이터 복원/증폭 송신

Layer 3 relay (small BS) : Equivalent to eNB with self-MR BS : Multi hop Relay Base Station to manage RSs

KRnet 2008- 29 -

Src : ITU Workshop (Nortel)

qbackhuling

MR-BS : Multi-hop Relay Base Station to manage RSsR S : Relay StationMS : Mobile Station

(7) Autonomous Self Organizing NW(7) Autonomous Self Organizing NW

Basic Operation of Self-Organizing Network (SON)시스템 운용의 안정화 최적화 및 운용 비용의 감소 (사업자 주도)

.

시스템 운용의 안정화, 최적화 및 운용 비용의 감소 (사업자 주도)

Basic operationA Self configuration thru

Basic operation of SON. A. Self-configuration thru

downloading B. Self-optimization thru measurement

Basic functionsBasic functionsSelf-configuringSelf-optimizingSelf-monitoring

IssuesSelf-Healing : automatic fault detection and recovering

Self-knowledge : autonomicSelf knowledge : autonomic surrounding detection and decision making

Support multi-vendor SON : standard issues (protocols

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standard issues (protocols, ANR, PhyCId, and S1/X2)

Src : LTEA Workshop (ALU)

(7) Autonomous SON(7) Autonomous SON –– ExampleExample

Reduction of OPEX with SON serverOPEX can be minimized by reducing manual operations => “by SON”OPEX can be minimized by reducing manual operations > by SON Both enhanced eNB and UE reporting allows always-on RAN monitoring for proactive reactions to user experiences.

SON Server

Configurationprofiles

SON Server

S lf D l bl C ll

Always on RAN performance monitoring based on eNB and UE reporting.

profiles

O&M

Measurement data

Self Deployable Cell

data

Automatic Common Channel Power Control Very low throughput reporting

with location info

HO failure reporting with location info

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Src : LTE-A WS (NEC)

(8) Applications (8) Applications –– Energy efficient BSEnergy efficient BS

Shutdown management of Radio Access NetworksCO2 emission causing global warming will be 1 6 times all over theCO2 emission causing global warming will be 1.6 times all over the world in 2030 (compared to 2005). LTE-Advanced should consider the reduction of CO2 emission due to RAN.

i i iPartial or complete eNB power down during low load, e.g. at night => Only Master BS active at night

Master BS

Automatic partial or complete power down

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Src : LTE-A WS (NEC)

complete power down

(9) Applications (9) Applications -- Cooperative Cooperative TransmissionTransmissionTransmissionTransmission

Simultaneous multiple-transmission of multi-media services 각 서비스 특성 (Q S)과 각 RAT (R di A T h l )의 트래픽 부하를각 서비스 특성 (QoS)과 각 RAT (Radio Access Technology)의 트래픽 부하를고려한 최적의 access network 선택 및 이 access network을 통한 동시 다중전송

• . Cooperative Transmission Tech.Techniques required for user-centric efficiency from the standpoint of a convergedstandpoint of a converged network with multi-RATsCommon & Generic RRM required for Cooperative TransmissionTransmission

Key issuesVertical handover tech. with route different traffic flows through different interfaces in parallelOptimized network load-balancing

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Src : IST project (TeliaSonera)

(9) Applications (9) Applications -- Medical ITMedical IT

Medical IT is one of the killer applications in next IT direction!

.Medical IT!

IP based medical system =

direction!

Medical application system using wireless tech.IP based medical system Bio-sensor + Wireless Body Area Network + Medical servers + Ubiquitous network i finfra

Potential patients, % of 60 years or older 2050 in the world : about 20%

Medical application system

world : about 20%

Real-time monitoring system on medical treatments”

Interworking for Medical IT!Interworking for Medical IT!셀룰러와 BAN간 연동 기능 필요

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Src : (NICT-ETRI Workshop, 2007), Ryuji Kohno‘s, YNU/NICT/Medical ICT Consortium

(9) Applications (9) Applications -- Medical ITMedical IT

Medical IT is one of the killer applications in next IT trends소요기술 : UWB Array Antenna SDR Positioning and Informatics etc

.

소요기술 : UWB, Array Antenna, SDR, Positioning, and Informatics, etc

Wireless devices /Bio-sensor for medical appl.

Wireless technology required in BANCountermeasure techniques

(equalization, diversity, coding, antenna, etc)etc)

Positioning & Ranging=Position recognition

(radar, navigation)

Awareness & Control= Inside body

Spread Spectrum &

UWB Technology

Wireless communication technologies to support medical treatments and diagnosis

Awareness & Control= Inside-body sensing

(sensor, adaptive control)

Information security=Abusiveness protection*Privacy

Array Antenna y

(charge info, privacy protection)

Reconfigure = Changing operator. Fault searching

(changing to new tech., fault maintenance)

Technology

Antenna(securing of good wireless commu.

environment)

Lower power consumption = Long operable time

SDRTechnology

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operable time(implementation of low power consumption)

Src : (NICT-ETRI Workshop, 2007), Ryuji Kohno‘s, YNU/NICT/Medical ICT Consortium

(10) Signaling Aspects(10) Signaling Aspects(Basic set(Basic set--up phase in LTE : Attach + M.O) up phase in LTE : Attach + M.O)

MME/S-GW

ENBUE

Cell SearchingSIB Acquisition

Idle

Event.1A (Power-On: Attach)

Random Access Response

Random Access Preamble

RRC Connection Request

RRC Connection Setup

Attach)

Event.2A (M.O)

How to optimize it?- Setup latency (50ms),- Multi-layered overhead, etc

(1) Identification (2) Authentication (3) Update of Loc (4) Create of default DRB & IP

Option Procedureonly for Attach (NW)

(Attach Request/ Service Request)RRC Connection Setup Complete Initial UE Message

Idle-Active(100ms/ 50ms)

“SRB1”assigned

(Attach Accept/ Service Accept)

RRC - Security Mode Command (KEY)

RRC Connection Reconfiguration

RRC Connection Reconfiguration Complete

Initial Context Setup Request (KEY)

Initial Context Setup Complete

No(still alive)

Event.1B “SRB 1/2+default DRB”assigned (Transfer mode on def DRB : SIP/Bgrd)

Yes(in idle)

After releasingall RRC-Connections

Connected (or Attached)

Event 1BInactivityTime-out?

RRC Connection Reconfiguration (add-DRB)

RRC Connection Reconfiguration Complete

SAE Bearer Setup Request

SAE Bearer Setup Response

“SRB 1/2+default DRB + additional DRB” assigned (Transfer mode)

(Old-DRB,New-DRB)

SRB 1/2 default DRB assigned (Transfer mode on def DRB : SIP/Bgrd)

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No(still alive)

Yes(in idle)

Connected

Event 1BInactivityTime-out?

Concluding RemarksConcluding Remarks

A model of LTE-Advanced network (LTE based)LTE Advanced =>“Multi RATs + Common All IP network + (WSN)”

PublicInternet

PSTN/PSDN

LTE-Advanced => Multi RATs + Common All IP network + (WSN) with support of vertical mobility

Common CN in NGN

P-GW

SGi

Operator IP Services(e.g. IMS, AF, etc)

P-GW IP-BB

PCRF

S7

Rx+

P-GW

CCS7

S-GWS11

S3

S4

S6

HLR/HSS

MME

SGSN

S1-US1 AP

S2a

RNC IP Trans. NW

NodeB

BSC

BTS E-NB

(GTP-U)S1 AP(SCTP)

ACR

RASE-NB+E-NB+

UE(MMMB)

LTE-Uu(Radio )

4G(LTE Based)

2G(e.g, GERAN)

3G(e.g,UTRAN, HSPA+)

3G+(e.g, LTE)

Non-3GPP(e.g. mWiMAX)

MHR MHR

HENB HENB

KRnet 2008- 37 -

(MMMB)* LTE (initial version) => LTE-Advanced (adv. version of LTE)

Concluding RemarksConcluding Remarks

LTE and LTE-A“LTE-Advanced = “A superset of LTE”

LTE-A is evolution of LTE with the following key issues! New architectureNew architecture

ARCH : Flexible and Scalable Architecture (Local area access)

New technologies/featuresRF Wid BW d B d ti f f t d tRF : Wider BW, and Band aggregation of fragmented spectrum

PHY : Advanced MIMO (corporate MIMO, network MIMO, UL-SU-MIMO)

BS : Multi-hop relay, (Advanced Home-cell)

iFurther improvementsICI : Advanced Inter-cell interference management

SON : Self Organizing Network

MBMS : Advanced MBMS

HO : Optimized Multi-RAT mobility, RRM : Cooperative RRM

APP : Medical IT, Wireless IPTV, D2D comm, ETWS, 3D Virtual Reality,

KRnet 2008- 38 -

CR, etc

ReferenceReference

[1] 3GPP LTE/SAE Documents”, 2006-2008

[2] 3GPP LTE-Advanced Workshop Presentation Materials, April, 2008

[3] IWCCF2007, “Seamless & Fast Vertical Handover in Heterogeneous Access Networks”, May, 2007y

[4] ITU-R Documents

[5] KRNET2007

[6] ETRI Internal Materials[6] ETRI Internal Materials

[7] Ryuji Kohno's, YNU/NICT/Medical ICT Consortium

[8] IST, E2R Project, “Workshop Materials”, 2005

KRnet 2008- 39 -

Q & AQ & AQ & A@

Q & A@pjsong@etri.re.kr

(010 9600 6404)

pjsong@etri.re.kr

(010 9600 6404)(010-9600-6404)(010-9600-6404)

KRnet 2008- 40 -