Wireless Networks and Services Wireless Networks and Services Ten Years Down the RoadTen Years Down the Road

Prof. Victor C. M. LeungTELUS Mobility Research Chair in Advanced Telecom. Eng.

Department of Electrical and Computer Engineering

The University of British Columbia, Canada

www.ece.ubc.ca/~vleung

WCNC 2009 Wireless Panel

Budapest, Hungary

April 7, 2009 © 2009

Current Trends in Wireless NetworkingCurrent Trends in Wireless Networking

• Support of applications and services will continue to migrate towards IP-based broadband networks

• Portable devices will be equipped to support multiple wireless standards– Multiple wireless interfaces

– Software defined radios

• Users have multiple alternatives for network access and need various aids for decision making

• License-free wireless will play an important role in interconnecting electronic devices in homes and work places– Broadband wireless for multimedia entertainment devices

– Lower rate longer range wireless for monitoring and control

– Practical civilian deployment of wireless ad hoc and sensor networks

Focus of My Research GroupFocus of My Research Group

• Network architectures, protocols, management algorithms, modeling and performance evaluations

• Two main thrusts:– Wireless telecom 3G and beyond

• Radio resource management for high speed packet access• Interworking of heterogeneous wireless networks • Handoff and mobility management• Quality of service provisioning• Authentication, authorization and accounting

– Networking for license-free wireless communications• Wireless personal area networks• Wireless sensor networks• Vehicular ad hoc networks and vehicle-infrastructure integration• Wireless body area networks• RFID networks

Current Collaborative Research ProjectsCurrent Collaborative Research ProjectsWireless telecom 3G and beyond

• Provisioning and management of IP-based multimedia mobility services over heterogeneous broadband wireless networks

• Towards the next generation telecommunication networks - Service integration over multi-technology access networks

• Interworking between cooperative access networks over IP backbone

• Dynamic resource allocation for uplink packet access in cellular networks

Networking for license-free wireless communications

• Enabling technologies for secure and reliable wireless body area sensor networks

• Vehicular telematics over WiFi and WiMAX multihop networks

• Reliable and trusted networking for data-centric wireless access with applications to vehicular telematics

• RFID-based sensor networks for detecting and tracking mobile targets

Future Challenges in Wireless NetworkingFuture Challenges in Wireless Networking• Higher data rate, better coverage, longer battery life, lower cost

• Cognitive radio network cognitive wireless network

• Convergence of wireless and optical networking technologies

• Wireless access becoming a commodity / utility

– Applications, applications, applications

• User-friendly technology-agnostic wireless access

– Convergence of access networks and application services over core IP network result in break down of service silos

– Need to manage subscriber access over multiple heterogeneous access networks for ubiquitous service access with uniform quality

• Application specific wireless networking

– Wireless networking for intelligent transportation system

– Wireless body area network, wireless healthcare / e-medicine

– Wireless home networking interconnecting multimedia entertainment devices, security devices, home control systems

– Wireless enabled intelligent power grids

Cognitive Wireless Local Area Network Cognitive Wireless Local Area Network over Optical Fibres (CWLANoF)over Optical Fibres (CWLANoF)

System Concept and Research Issues

Cognition CycleCognition Cycle

From J. Mitola III, “Cognitive Radio for Flexible Mobile Multimedia Communications”, Kluwer Mobile Networks and Applications, vol. 6, pp. 435–441, 2001

RF over FibreRF over Fibre

• Uses low cost uncooled directly-modulated laser diodes

– Distributed feedback (DFB) lasers

– Vertical-cavity surface-emitting lasers (VCSELs)

• Flat frequency response over wide frequency range (> 2 GHz)

CWLANoFCWLANoF vs. Conventional ESS vs. Conventional ESS

WLANController

CAP2 fibers

Digital

Analog

RAU

AP

12CSMA

Conventional ESS

CWLANoF ESS

Cognitive WLAN over FibreCognitive WLAN over FibreSystem ArchitectureSystem Architecture

RAU

CAP

Ethernet

8 fibers

Optical Interface(E/O and O/E)

RF / Baseband

Optical Interface(E/O and O/E)

RF / Baseband

…

Bridge to 802.3 Ethernet

Central Control Unit (CCU)

From/toRAU #1

From/toRAU #N

802.11a/b/g WLAN protocol parallel processing units

A/D

DSP

Spectrum Usage Assessment

Cognitive Access Point (CAP)

Functions of CAPFunctions of CAP

• Receive full spectrum of ISM band

• Receive multiple WLAN channels

• Cooperatively demodulate user packets received over multiple RAUs

• Identify and localize all sources of interference

• Transmit full spectrum of ISM band

• Transmit multiple WLAN channels

• Cooperatively transmit user packets over multiple RAUs

• Interference mitigation

– Cancellation

– Avoidance

• Multiple-RAU management

– Diversity

– Multi-input Multi-output

– Beam forming

• Radio resource management

– Channel selection

– Signalling diversity

– Transmission scheduling

– Transmit power control

• Connection admission control

• Quality of service assurance

Research IssuesResearch Issues

• Proposed CWLANoF architecture offers potential for many new research problems and novel solutions

• Objective is to take advantage of the unique features of the proposed architecture by developing novel communication techniques

– New signal processing algorithms• Spectrum sensing techniques

• MIMO

• Beam forming

• Interference cancellation

– New radio resource management algorithms• Channel and power allocation

• Interference avoidance

– New MAC and network management protocols

• Performance evaluations challenging due to needs target dynamic environments

CWLANoF TestbedCWLANoF Testbed

• Testbed consists of Zinwave DAS and powerful DSP-based SDR platform

• CDN$150K NSERC Research Tools and Instruments grant awarded

• Research on radio management issues in progress

Ten Years Down The RoadTen Years Down The Road

• Wireless communications and networking becoming a cross-discipline multi-disciplinary research area

• Micro- and nano-scale wireless communications– Wireless network on a chip

– Wireless-enabled in-body biomedical devices

• User-centric wireless networking– The right tool for the environment

– Cognitive of the needs of the user and the environmental constraints

• The wireless utility– Delivery of more than digital data

• We need to collaborate with colleagues in other areas!

Thank you!