Third-Generation Mobile Services

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Introduction Third-generation (3G) mobile

communication systems Better system capacity Higher data transmission

speed Wireless internet access and

wireless multimedia service 1G mobile network

아날로그 통신망 , AMPS 2G mobile network

디지털 통신망 , GSM 2.5G mobile network

2 세대 이동통신망보다 빠른 데이터 처리 속도 , GPRS

3G mobile network UMTS, IMT-2000

IMT-2000 Internal Mobile Telecommunication 2000 음성 및 중 , 저속 데이터 위주의 서비스 수용 고속의 데이터 전송능력 다양한 데이터 , multimedia 서비스 유 , 무선 통합 서비스 전세계적으로 같은 주파수 대역 및 같은 기술 사용

세계 어디서나 서비스: Global Roaming, Virtual Home Environment

북미 방식의 동기식 (cdma2000) 과 유럽 / 일본 방식의 비동기식 (W-CDMA) 이 있다 .

Paradigm Shifts in Third-Generation System

Concepts of third-generation systems introduce two paradigm shifts Shift from voice-centric traffic to data-centric traffic

Circuit-based infrastructure -> Packet-based infrastructure Distance-insensitive communication cost in mobile core network Maintaining QoS Improving protocols to support streaming traffic->GPRS network architecture

Data applications continue evolve Advanced application protocols, human interface become crucial Bandwidth-constrained Portable terminals are limited by

Size, weight, power consumption and delay constraints->WAP, MExE proposed to support wireless data application

W-CDMA and cdma2000

비동기식방식 동기식방식

일반적 표현 WCDMA (UMTS) CDMA2000

주도지역 유럽 / 일본 ( 기존 GSM 사용지역 )

북미 ( 기존 CDMA 사용지역 )

기술표준 단체 3GPP 3GPP2

구성 단체 ETS( 유럽 ), TIA( 미국 ), TTA( 한국 ), ARIB/TTO(

일본 ), CWTS( 중국 )

TIA( 미국 ), ARIB/TTO( 일본 ),

TTA( 한국 ), CWTS( 중국 )

핵심망규격 GSM IS-95

기지국간 동기 각각의 기지국 마다 상이한 PN code 를 갖는 비동기

GPS 를 이용한 기준 시간을 획득하는 방식 , 기지국마다

동일한 PN code 를 사용무선접속 규격 DS (Direct Sequence)

방식MO (Multi Carrier) 방식

대역폭 5MHz 1.25MHz

Chip Rate 3.84Mcps 3.6864Mcps

W-CDMA and cdma2000 simultaneously adapted for the 3G standard Harmonization of two systems become necessary Cross-license intellectual property on fair, reasonabl

e, and nondiscriminatory terms (by manufacturing community)

Cannot be achieved at the physical layer Political reason, two chip rate, two synchronous and asynchr

onous system Interoperability at the higher layer protocols

Result in higher costs with degraded performance

Improvement on Core network

To reduce the international roaming signaling traffic 3GPP 23.119 spec. GLR (gateway location register)

GLR between VLR/SGSN and the HLR GLR is treated as the roaming user’s HLR at

visited network Viewpoint of HLR at home network, GLR act as

the VLR/SGSN After the first registration, all subsequence

registrations are performed locally

VLR GLR HLR

1.MAP_UPDATE_LOCATION2.MAP_UPDATE_LOCATION

3. MAP_INSERT_SUBSCRIBER_DATA

4. MAP_INSERT_SUBSCRIBER_DATA

5. MAP_INSERT_SUBSCRIBER_DATA_ack6. MAP_INSERT_SUBSCRIBER_DATA_ack

7.MAP_UPDATE_LOCATION_ack8.MAP_UPDATE_LOCATION_ack

Visited Network Home Network

Message flow for the first registration with GLR

VLROLD VLRNEW GLR

1.MAP_UPDATE_LOCATION

2. MAP_CANCEL_LOCATION

3. MAP_CANCEL_LOCATION_ack

4. MAP_INSERT_SUBSCRIBER_DATA

5. MAP_INSERT_SUBSCRIBER_DATA_ack

7.MAP_UPDATE_LOCATION_ack

Visited Network

Message flow for a subsequent registration with GLR

VLROLD GLR

1.MAP_UPDATE_LOCATION2. MAP_CANCEL_LOCATION

6. MAP_INSERT_SUBSCRIBER_DATA

7. MAP_INSERT_SUBSCRIBER_DATA_ack

8.MAP_UPDATE_LOCATION_ack

HLR VLRNEW

3. MAP_CANCEL_LOCATION

4. MAP_CANCEL_LOCATION_ack5. MAP_CANCEL_LOCATION_ack

Visited Netowrk Home Network

Message flow for the location cancellation with GLR

VLRMSC GLR HLR GMSC

1.MAP_SEND_ROUTING_INFORMATION

2.MAP_PROVIE_ROAMING_NUMBER3. MAP_PROVIDE_ROAMING_NUMBER

4. MAP_PROVIDE_ROAMING_NUMBER_ack5. MAP_PROVIDE_ROAMING_NUMBER_ack

6. MAP_PROVIDE_ROAMING_NUMBER_ack

8. IAM

Message flow for the mobile termination call with GLR

Quality of service in 3G From the viewpoint of end users,

QoS attributes General Simple Small (number)

From the viewpoint of the network, QoS will be defined with a set of parameters

3G QoS control mechanism Efficiently utilize resource Interwork with current QoS schemes Present end-to-end QoS

QoS class for 3G (specifically UMTS) – differ from fixed networks, based on delay sensitivity Conversation – voice applications Streaming - video on demand Interactive - telnet, web browsing Background - FTP

Wireless Operation System for 3G Handset

3G handset Packet switched Wideband IP Multimedia-based User-friendly customized handset design

Wireless OS 3G handset = 2G’s function + PDA + … To support wireless multimedia device Requirement

Immediate access to application Modular Low-powered CPU Protected in a read-only-memory

Third-Generation Systems and Field Trials

DoCoMo W-CDMA field trial Lucent cdma2000 system Nortel W-CDMA trial system Ericsson W-CDMA trial system Motorola cdma2000 trial system