3G 이동통신망의 Multimedia 서비스를 QoS Architectureumls.kaist.ac.kr/professor/ftp/4th_workshop/04-3G... · 2011-07-19 · CRL 제4회추모워크샵 Multimedia Services

3G 이동통신망의Multimedia 서비스를

위한 QoS Architecture

임 병근 [email protected]

통신망기술팀/구조설계Gr

LG전자 핵심망연구소

CRLCRL제제44회회 추모워크샵추모워크샵

Multimedia ServicesMultimedia Servicesin the Next Generation Networksin the Next Generation Networks

목 차

1. 3G Multimedia Service Network Configuration

2. 3GPP UMTS System QoS Architecture

3. 3GPP2 cdma2000 System QoS Architecture

4. Issues and Summary









3세대 이동통신 네트웍의 특징

n Wireless Mobile Packet Data Communication ¨ High Speed Wireless Data 통신 시스템

¨Mobile Wireless Internet Access Network

n Extend the transparent Internet Services¨ on top of the mobile device

n All IP Network and Multimedia Services¨모든 네트웍요소를 IP 로 연결

¨모든 서비스를 IP 기반으로 제공



n IT Technology shift ¨ from Circuit technology to packet technology

¨ de facto packet standard technology is IP technology

¨ drives 3G system networking and services into IP world

n Driving force - Cost and Services¨ IETF protocol, Multimedia data are cheap and

prevailing in Internet industry.

All IP Network and Multimedia Services



n IP based call and media services¨Multimedia Services over the Internet, SIP based

VoIP and Multimedia Call

n IP switch for the voice over packet (IP MSC)¨Media Gateway and Controller replace legacy

Switch

¨ Transmission efficiency, cost , open interface, and scalability

n IP in the RAN ¨ IP transportation over Iub/Iur and Abis/A3/A7 etc.

All IP Network and Multimedia Services



Cdma2000 Network Configuration

BTSBSC/PCF

BSC3/PCFBTS

Abis

A3/A7

Abis

BTS

MM

AAA

AGW/PDSN

HLR/AUC

MSCServer

SCP

IP network

R-SGW

T-SGW

MGW

T-SGW

SCM BR

HA

MGW

R-SGW

MRF

DB

PDE/PS

CQMIP

networkInternet

PSTN/PLMN

IP network(Intranet)



IP MultimediaHome Domain

TIA-EIA-41 PS Home Domain

HomeRAN

PDSN

AGW IP MultimediaVisited Domain

Internet

BR

MS

VisitedRAN

AGW

PDSN

TIA-EIA-41 PS Visited Domain

BR

MS

TIA-EIA-41 CS Home Domain

TIA-EIA-41 CS Visited Domain

BR BR

BSCBSC

PSTN/PLMN

IP coreNetwork

IP coreNetwork

Cdma2000 Network ConfigurationDomain View



Operator Networks control SIP based VoIP and Multimedia Call Connection Servicesand QoS. Various new services shall be supplied and controlled by the SCM

AGW/PDSN

MRFHA SCM

SIP client

UDP

IP

SIP server

PPP

Airlink

IP

PPP

RAN link

IP

link link

IP

link

UDP

IP

link

SIP client

UDP

Sup. Service Sup. service OperatorSpecific Services

< Control Plane >

RTP

UDP

IP

PPP

Airlink

IP

PPP

RAN link

IP

link link

IP

link

RTP

UDP

Voice/image

< User Data Plane >

Voice/image

SIP server

UDP

IP

link

Sup. service

End-to-End SIP based VoIP protocol in the IP multimedia Domain



ISPDomain

Operator Networks control only the IP connectivity, support Internet access Services.End-to-End VoIP is done beyond the control of the Operators network, it is controlledby the ISP network entities.

AGW/PDSN

MCUHA SIP server

SIP client

UDP

IP

SIP server

PPP

Airlink

IP

PPP

RAN link

IP

link link

IP

link

UDP

IP

link

SIP client

UDP

Sup. Service Sup. service

< Control Plane >

RTP

UDP

IP

PPP

Airlink

IP

PPP

RAN link

IP

link link

IP

link

RTP

UDP

Voice/image

< User Data Plane >

Voice/image

SIP server

UDP

IP

link

Sup. service

ISPspecific services

End-to-End SIP based VoIP protocol in the Internet



UMTS Network Configuration

Gf Gi

Iu

GiMr

Gi

Ms

Gi

R UuMGW

Gn

Gc

TE MT UTRAN

Gr

SGSN GGSN

EIR

MGCF

R-SGW *)

MRF

MultimediaIP Networks

PSTN/Legacy/External

Applications &Services *)

Mm

Mw

LegacymobilesignallingNetwork

Mc

Cx

AlternativeAccess

Network

MhCSCF

CSCFMg

T-SGW *)

T-SGW *)

HSS *)

HSS *)

Applications& Services *)

MSCserver GMSC server

McMc

D C

SCP

CAP

MGWNb

Nc

Iu

Iu

R-SGW *)Mh

CAPCAP

R UmTE MT

BSS/GERAN Gb

A

Iu



UE

Home NetworkIM Subsystem

Visited NetworkIM Subsystem

Inter -NetworkIM Backbone

Internet

Intranets

Visited NetworkPS Domain Backbone

Home NetworkPS Domain Backbone

Inter -PLMNBackbone

BG

BG

GGSN

GGSN

BG

BG

Gp

Gp

Gi

SGSN

SGSN

Traffic tunneledover GPRS

Gi Implementedon VPN or dedicated resources

for each instance

UTRAN

UTRAN

UE

UMTS Network ConfigurationDomain View



n Legacy Service QoS management¨ circuit switched network - End-to-End fixed slot/

bandwidth 할당 또는 거부(call block)

¨ Best Effort network - packet 단위 관리, drop 또는지연

¨성공적인 서비스 운영 및 제공

n IP multimedia and VoIP QoS management¨ packet 꾸러미 단위 관리의 All IP and IP network 에

서 conversational service를 제공함.

¨ drop 또는 지연의 factor를 end-to-end 로 관리해야하는 새로운 QoS 요구사항이 준수되어야 함

QoS









n TS23.107¨ QoS concept and architecture

¨ End-to-End QoS 를 만족시키기 위한 체계

n Concept and Architecture¨계층별로 QoS 를 구분

¨계층별 QoS를 만족하게 함으로써 end-to-end QoS를 만족

¨계층별 상호 QoS 관리 신호전달

¨ Traffic Class 별 QoS parameter 관리

UMTS QoS



End-to-End QoS architectureTE MT UTRAN CN Iu

EDGENODE

CNGateway

TE

UMTS

End-to-End Service

TE/MT LocalBearer Service

UMTS Bearer Service External BearerService

UMTS Bearer Service

Radio Access Bearer Service CN BearerService

BackboneBearer Service

Iu BearerService

Radio BearerService

UTRAFDD/TDD

Service

PhysicalBearer Service



UMTS QoS classes

Traffic class

Fundamental characteristics

Example ofthe

application

Conversational classConversational RT

Streaming classStreaming RT

Interactive classInteractive besteffort

BackgroundBackground best effort

-Preserve time relation (variation) between information entities of the stream - Conversational pattern (stringent andlow delay )

Preserve timerelation (variation) between information entities of thestream

-Requestresponsepattern

-Preserve payload content

-Destination isnot expecting

the data withina certain time

-Preserve payload content

-voice -streaming video -Web browsing -background download of emails



UMTS bearer attributes

Traffic class Conversational Streaming Interactive Backgroundclass class class class

Maximum bitrate X X X XDelivery order X X X XMaximum SDU size X X X XSDU format information X XSDU error ratio X X X XResidual bit error ratio X X X XDelivery of erroneous SDUs X X X XTransfer delay X XGuaranteed bit rate X XTraffic handling priority XAllocation/Retention priority X X X X



n Control plane function¨ Service manger - establishing, modifying and maintaining the service

¨ Translation - service attributes and QoS attributes

¨ Admission/Capability control - network의 모든 자원 관리

¨ Subscription control - 가입자 요구 QoS와 등록된 QoS 비교

n User plane function¨Mapping - QoS marking

¨ Classification - MT의 QoS attribute에 기반한 분류

¨ Resource manger - scheduling, bandwidth management

¨ Traffic conditioner - by policing or by traffic shaping

QoS Management Functions



QoS management functionsin the control plane

Transl. Transl.

Adm.Contr

.

RABManager

UMTS BSManager

UMTS BSManager

UMTS BSManager

Subscr.Control

Adm./Cap.Control

MT GatewayCN EDGEUTRAN

Ext.ServiceControl

LocalServiceControl

Iu BSManager

Radio BSManager

Iu NSManager

UTRAph. BS M

Radio BSManager

UTRAph. BS M

Local BSManager

Adm./Cap.Control

Adm./Cap.Control

Adm./Cap.Control

Iu BSManager

Iu NSManager

CN BSManager

Ext. BSManager

CN BSManager

service primitive interface

BB NSManager

BB NSManager

protocol interface

TE Ext.Netw.



ResourceManager

Mapper

Classif.

Cond.

ResourceManager

ResourceManager

Mapper

ResourceManager

Mapper

ResourceManager

ResourceManager

Cond.

Classif.

Cond.

MT GatewayCN EDGEUTRAN

BB network serviceIu network serviceUTRA phys. BS

data flow with indication of direction

TE Ext.Netw.

Local BS External BS

QoS management functionsin the user plane



ResourceManager

Mapper

Classif.

Cond.

GatewayGGSN

(BB network service)ResourceManager

ResourceManager

Mapper

CN EDGESGSN

External BS

Intermediate BB network QoS

IP network

- BB network의 IP node/switch가 존재 하게 되는데 per flow 기반의 VoIP multimedia session을 어떻게 관리 할 것인가?

- RSVP ? Diffserv ? 다른 대안은?



ResourceManager

Mapper

Classif.

Cond.

GatewayGGSN

External BS

R5 - IP Multimedia Subsystem QoS

- Native IP Network 에서의 Per Flow based End-to-End QoS관리의 방법은?

IP networkfor

IM subsystem

MGWMRF

MGC

SGWCSCFPSTN/PLMN









n P.S0001-B : Wireless IP network 표준¨ End-to-End VoIP를 위한 MS to PDSN PPP link QoS

관리 기능이 준비됨

¨ TSG-P의 방안은 확정 되었으나 RAN과 A/I에는 TSG-P요구 기능이 반영되지 않은 상태임.

¨계층별로 QoS 로 구분하자는 QoS architecture의 정립은 이루어지지 않았고 draft상태임n 계층별 상호 QoS 관리 신호전달

n Traffic Class 별 QoS parameter 관리

Cdma2000 IP multimedia QoS



End-to-End QoS architecture

MS HA CNRAN PDSN

End-to-End service

PPP link service External bearer service

R-P bearerservice

IS2000 radio bearerservice



TSG-P Traffic classes for cdma2000

Traffic classServiceinstancetype

Priority Headercompression

Applications

Background Primary (SI-TYPE-1)

Verylow

VJRFC2507

FTP, Email,Streaming text

Interactive Primary(SI-TYPE -1)

Low VJRFC 2507

Web browsing

Streaming Secondary(SI-TYPE -3)

High ROHC Streaming audio andvideo

Secondary(SI-TYPE -2)

Veryhigh

ROHC 0-byteROHC 0-byte lite

EVRC VoIP (for end-to-end VoIP MS andHybrid VoIP MS)

Conversational

Secondary(SI-TYPE -3)

High ROHCRFC2508

Multimedia



n MS과 PDSN사이의 단일 PPP link상에서 RTP/UDP/IP의stream 구분에 따른 독립된 QoS관리

n Stream 별 radio bearer service instance(SR_ID)를 구분하여 QoS 관리

n SR_ID에 따른 R-P bearer connection 을 구분하여 QoS 관리

n MS이 application의 stream 에 따른 service instance의생성 소멸을 제어

n MS는 MCFTP protocol을 사용하여 PDSN에 stream flow에 대한 QoS profile(traffic flow template)전달

PPP link QoS management



Multiple Connection Relationships

PPP session

R-P session

R-PConnectio

R-PConnectio

R-PConnectio

ServicInstanc

Serviceinstanc

Servicinstanc

PPP session MS

PDSN

Ch1=

sr

_id1

Ch2=

sr

_id2

ch3=

sr

_id3

IP1TFT_ch

IPn(TFT_ch1TFT_ch

IP1TFT_ch

IPn(TFT_ch1TFT_ch

BSC/PCF

TFT_ch1 indicates a TFT over Ch1 orService instance identified by SR_ID1.One TFT for each MS IP addresses (IP1,.. IPn)and for each Channel (SR_ID) may exist.

One PPP session for one R -P session per MS

Multiple R -P connections for each R -P session

The channel connecting the service instancsand the R -P connections are identified byservice reference Ids.

On the MS side, each instance of a serviceoption indicates a service instance.

PPP session

R-P session

R-PConnectio

R-PConnectio

R-PConnectio

ServicInstanc

Serviceinstanc

Servicinstanc

PPP session MS

PDSN

Ch1=

sr

_id1

Ch2=

sr

_id2

ch3=

sr

_id3

IP1TFT_ch

IPn(TFT_ch1TFT_ch

IP1TFT_ch

IPn(TFT_ch1TFT_ch

BSC/PCF

TFT_ch1 indicates a TFT over Ch1 orService instance identified by SR_ID1.One TFT for each MS IP addresses (IP1,.. IPn)and for each Channel (SR_ID) may exist.

One PPP session for one R -P session per MS

Multiple R -P connections for each R -P session

The channel connecting the service instancsand the R -P connections are identified byservice reference Ids.

On the MS side, each instance of a serviceoption indicates a service instance.



QoS signaling mechanism

MCFTP

MS BSS/PCF PDSN

New SR_IDtraffic

New R-P connection

SIP signaling SIP Peer

TFTprofile

TFTfilteringandflowselection

Service InstanceCH

R-PConnection



Upper layers

HDLC escaping & framing

PPP

Upper layers

PPP

HDLCun-framing &un-escaping


SI-TYPE_2

SI-TYPE_1

SI-TYPE_3

A8_1

A8_2

A8_3

A10_1

A10_2

A10_3

Upper layersUpper layers



SI-TYPE_2

SI-TYPE_1

SI-TYPE_3

A8_1

A8_2

A8_3

A10_1

A10_2

A10_3

MS PDSN

PDSNMS

BSC PCF

BSC PCF

HDLC escaping & framing

PPP PPP

SI type별 PPP processing 구조



RTP/UDP/IP Overhead

EVRC or SMV packet(22,10, 5, 2 octets)RTP HDPPP HD IP HD UDP HD PPP tailRTP/UDP/IP tail

. FCH 에 전달되는 EVRC, SMV data 에 비하여, VoIP 사용시 PPP/IP/UDP/RTP header가Voice Data크기의 배 이상의 무선 bandwidth를 소모하므로, header compression이요구된다.

. 무선 자원은 유한 하며 단위 FA/Sector당 Data Throughput의 성능개선을 위한 노력을고려 할 때, RTP/UDP/IP 뿐만 아니라 PPP header까지 완전히 제거 하여 FCH을 통한기본음성 통신 시의 무선효율을 요구하고 있다.

. 이에 따라, 다양한 HC algorithm이 제시되고 있으며, 이에 따른 Air I/F의 보완까지요구된다.

. VoIP traffic flow 인 경우 MS와 PDSN의 PPP link에서 header striping/regeneration 적용

Overhead Overhead



Protocol Stack Diagram for Header Stripping

Header StrippedPayloadsHeader Stripped

Payloads

RLP

MS

CDMA2000 MAC

PPP/MCFTP

IP

BS PCF PDSN

CDMA2k IP

GRE

IP

GRE

IP

GRE

IP

GRE

PPP/MCFTP

IP

RLP

SI-type 2 packet



Message Flow for Header Stripping and Generation Operation

1. E2E SIP

2. HSG SO Originate

3. A9 Establish A8

4. A11 Establish A105. A11 Reply

6. A9 Reply

7. HSG SO Connect Order

8. MCFTP Flow Treatment

9. MCFTP Full Header (Rev)

10. MCFTP Full Header (Fwd)

11. Media Flows

MS BS PCF PDSN Internet









n Delay Budget Management¨ End-to-End, Link-to-Link의 requirement

n Intermediate Transport Node QoSManagement¨ IP router/switch의 QoS 관리 signaling이 요구됨

¨ R-P link , GPRS backbone nodes

n Per flow based QoS management¨ Core Network 에서 UMTS/Cdma2000 IP multimedia

domain 표준 통합이 요구됨

3G VoIP/Multimedia QoS issues

Documents

3G 이동통신망의 Multimedia 서비스를 QoS Architectureumls.kaist.ac.kr/professor/ftp/4th_workshop/04-3G... · 2011-07-19 · CRL 제4회추모워크샵 Multimedia Services