Transcript ppt - MMLab

Challenges in the Migration to
4G Mobile Systems
Suk Yu Hui and Kai Hau Yeung
City university of Hong Kong
Presenter: Shuai Peng
([email protected])
Contents



Introduction
Overview of the Challenges
Research Challenges

Mobile Station




System





Terminal Mobility
Network Infrastructure and QoS Support
Security
Fault Tolerance and Survivability
Service



Multimode User Terminals
Wireless System Discovery
Wireless System Selection
Multi-operators and Billing System
Personal Mobility
Conclusion
2
Introduction

2G – 2nd Generation Mobile System



GSM, IS-95, cdmaOne
Low-bit-rate data
3G – 3rd Generation Mobile System
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
Higher-data-rate service
New technology
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GPRS
IMT-2000
Bluetooth
WLAN
HiperLAN
Independent systems, all have there own shortcomings
A single system is needed to replace all of them – 4G
3
Introduction

4G – 4th Generation Mobile System

Key Features from Users’ Point of View
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All-IP based network – any system / any time / any where
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Telecommunications services + data and multimedia services
Personalized service
Facilities for integrated services
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High usability: anytime, anywhere, and with any technology
Support for multimedia services at low transmission cost
Personalization
Integrated services
Challenge to Migrate to 4G



Mobile station
System
Service
4
Contents

Introduction

Overview of the Challenges

Research Challenges

Mobile Station




System





Terminal Mobility
Network Infrastructure and QoS Support
Security
Fault Tolerance and Survivability
Service



Multimode User Terminals
Wireless System Discovery
Wireless System Selection
Multi-operators and Billing System
Personal Mobility
Conclusion
5
Overview of the Challenges

Mobile Station



Multimode User Terminals
Wireless System Discovery
Wireless System Selection
6
Overview of the Challenges

System




Terminal Mobility
Network Infrastructure and QoS Support
Security
Fault Tolerance and Survivability
7
Overview of the Challenges

Service


Multi-operators and Billing System
Personal Mobility
8
Contents

Introduction
Overview of the Challenges

Research Challenges


Mobile Station




System





Terminal Mobility
Network Infrastructure and QoS Support
Security
Fault Tolerance and Survivability
Service



Multimode User Terminals
Wireless System Discovery
Wireless System Selection
Multi-operators and Billing System
Personal Mobility
Conclusion
9
Research Challenges – Mobile Station

Multimode User Terminals

Needs: terminals can adapt themselves for different wireless networks
Ideal solution: adopt the software radio approach
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Challenge – current technology is not completely feasibility
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
One antenna and one LNA cannot serve the wide range of frequency bands
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Existing ADCs are not fast enough
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Need multiple analog parts
The fastest current ADC is still 2 to 3 orders slower
Needs more interface functions for real-time execution

More functions cause high circuit complexity, high power consumption and dissipation
10
Research Challenges – Mobile Station

Wireless System Discovery
GSM – periodically broadcast
 4G – more complicated because of
difference in network and protocols
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Solution and Challenge
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Scanning by software radio
Load required software for network
OTA (Over The Air)
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Free users from download
Simplify network Management
Long downloading time
Slow downloading speed
11
Research Challenges – Mobile Station
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Wireless System Selection
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Needs

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
Select the optima network for the service needed
Right network ensure QoS (Quality of Service)
Challenge
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Network change from time to time – complicated to select
Adequate knowledge of networks is required to make the selection
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Precise understanding of supported service
System data rates
QoS requirements
Communication costs
User preference
Contents

Introduction
Overview of the Challenges

Research Challenges


Mobile Station




System





Terminal Mobility
Network Infrastructure and QoS Support
Security
Fault Tolerance and Survivability
Service



Multimode User Terminals
Wireless System Discovery
Wireless System Selection
Multi-operators and Billing System
Personal Mobility
Conclusion
13
Research Challenges – System

Terminal Mobility


Allows user to roam across networks
Solutions and Challenges

Location management
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
Information about the roaming terminal
 Original and current located cells
 Authentication information
 QoS capabilities
Handoff management
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System load, handover latency, package losses
Horizontal and Vertical handoff
Rea-time multimedia service
 No latency!
Correct handoff time
Uncertain handoff times
 Hard to design good handoff
mechanisms
14
Research Challenges – System

Network Infrastructure and QoS Support

Background

Non-IP-based system – Voice delivery


IP-based system – Data service


GSM, CDMA2000, UMTS
802.11, WLAN, HiperLAN
For 4G – Integrating


How to integrate?
How to ensure QoS?


More and more systems are involved
Hard to guarantee end-to-end QoS
 From provider to user
15
Research Challenges – System

Security and Privacy

Background



2G / 3G: different standards implemented for their unique feature
Existing security schemes are inadequate for 4G
Challenge
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Key concern for 4G – Flexibility
Should be applied to different technologies and devices

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Varied capabilities
Varied processing powers
Varied security needs
Fault Tolerance and Surivivability

One network fails, many other networks afffected
16
Contents

Introduction
Overview of the Challenges

Research Challenges


Mobile Station




System





Terminal Mobility
Network Infrastructure and QoS Support
Security
Fault Tolerance and Survivability
Service



Multimode User Terminals
Wireless System Discovery
Wireless System Selection
Multi-operators and Billing System
Personal Mobility
Conclusion
17
Research Challenges – Service

Multi-operators and Billing System

Background
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
Challenge
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Today’s system – a flat rate based billing system
4G – more comprehensive billing and accounting system
User subscribe to many services from many providers at same time
New business architecture, accounting process and data maintenance
Equalization on different charging schemes
One Single Billing Method Covers All
18
Research Challenges – Service

Personal Mobility
19
Conclusion


Introduction for 2G / 3G / 4G System
Research Challenges

Mobile Station




System





Terminal Mobility
Network Infrastructure and QoS Support
Security
Fault Tolerance and Survivability
Service



Multimode User Terminals
Wireless System Discovery
Wireless System Selection
Multi-operators and Billing System
Personal Mobility
In My Point of View


Listed Framework for 4G System, Challenges and Possible Solutions
Further Research Needed into Specified Domain
20