1. Third-Generation Mobile Services
NCLab
석사 1학기
박호진

2. 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
2세대 이동통신망보다 빠른 데이터 처리 속도, GPRS
3G mobile network
UMTS, IMT-2000

3. 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.

4. 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

5. 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 code를 갖는 비동기
GPS를 이용한 기준 시간을 획득하는 방식, 기지국마다 동일한 PN code를 사용
무선접속 규격
DS (Direct Sequence) 방식
MO (Multi Carrier)방식
대역폭
5MHz
1.25MHz
Chip Rate
3.84Mcps
3.6864Mcps

6. W-CDMA and cdma2000 simultaneously adapted for the 3G standard
Harmonization of two systems become necessary
Cross-license intellectual property on fair, reasonable, and nondiscriminatory terms (by manufacturing community)
Cannot be achieved at the physical layer
Political reason, two chip rate, two synchronous and asynchronous system
Interoperability at the higher layer protocols
Result in higher costs with degraded performance

7. Improvement on Core network
To reduce the international roaming signaling traffic
3GPP 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

8. Message flow for the first registration with GLR

9. Message flow for a subsequent registration with GLR

10. Message flow for the location cancellation with GLR

11. Message flow for the mobile termination call with GLR

12. 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

13. Wireless Operation System for 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

14. 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