Challenges in the Migration to 4G Mobile Systems

Challenges in the Migration to4G Mobile Systems Suk Yu Hui and Kai Hau Yeung City university of Hong Kong Presenter: Shuai Peng (William@camus.snu.ac.kr)

Contents • Introduction • Overview of the Challenges • Research Challenges • Mobile Station • Multimode User Terminals • Wireless System Discovery • Wireless System Selection • System • Terminal Mobility • Network Infrastructure and QoS Support • Security • Fault Tolerance and Survivability • Service • Multi-operators and Billing System • Personal Mobility • Conclusion

Introduction • 2G – 2nd Generation Mobile System • GSM, IS-95, cdmaOne • Low-bit-rate data • 3G – 3rd Generation Mobile System • Higher-data-rate service • New technology • GPRS • IMT-2000 • Bluetooth • WLAN • HiperLAN • Independent systems, all have there own shortcomings • A single system is needed to replace all of them – 4G

Introduction • 4G – 4th Generation Mobile System • Key Features from Users’ Point of View • High usability: anytime, anywhere, and withany technology • Support for multimedia services at lowtransmission cost • Personalization • Integrated services • All-IP based network – any system / any time / any where • Telecommunications services + data and multimedia services • Personalized service • Facilities for integrated services • Challenge to Migrate to 4G • Mobile station • System • Service

Overview of the Challenges • Mobile Station • Multimode User Terminals • Wireless System Discovery • Wireless System Selection

Overview of the Challenges • System • Terminal Mobility • Network Infrastructure and QoS Support • Security • Fault Tolerance and Survivability

Overview of the Challenges • Service • Multi-operators and Billing System • Personal Mobility

Research Challenges – Mobile Station • Multimode User Terminals • Needs: terminals can adapt themselves for different wireless networks • Ideal solution: adopt the software radio approach • Challenge – current technology is not completely feasibility • One antenna and one LNA cannot serve the wide range of frequency bands • Need multiple analog parts • Existing ADCs are not fast enough • 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

Wireless System Discovery GSM – periodically broadcast 4G – more complicated because of difference in network and protocols Solution and Challenge Scanning by software radio Load required software for network OTA (Over The Air) Free users from download Simplify network Management Long downloading time Slow downloading speed Research Challenges – Mobile Station

Research Challenges – Mobile Station • Wireless System Selection • Needs • Select the optima network for the service needed • Right network ensure QoS (Quality of Service) • Challenge • Network change from time to time – complicated to select • Adequate knowledge of networks is required to make the selection • Precise understanding of supported service • System data rates • QoS requirements • Communication costs • User preference

Research Challenges – System • Terminal Mobility • Allows user to roam across networks • Solutions and Challenges • Location management • Information about the roaming terminal • Original and current located cells • Authentication information • QoS capabilities • Handoff management • 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

Research Challenges – System • Network Infrastructure and QoS Support • Background • Non-IP-based system – Voice delivery • GSM, CDMA2000, UMTS • IP-based system – Data service • 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

Research Challenges – System • Security and Privacy • Background • 2G / 3G: different standards implemented for their unique feature • Existing security schemes are inadequate for 4G • Challenge • Key concern for 4G – Flexibility • Should be applied to different technologies and devices • Varied capabilities • Varied processing powers • Varied security needs • Fault Tolerance and Surivivability • One network fails, many other networks afffected

Research Challenges – Service • Multi-operators and Billing System • Background • Today’s system – a flat rate based billing system • 4G – more comprehensive billing and accounting system • Challenge • 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

Research Challenges – Service • Personal Mobility

Conclusion • Introduction for 2G / 3G / 4G System • Research Challenges • Mobile Station • Multimode User Terminals • Wireless System Discovery • Wireless System Selection • System • Terminal Mobility • Network Infrastructure and QoS Support • Security • Fault Tolerance and Survivability • Service • 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

Challenges in the Migration to 4G Mobile Systems