Transcript GCC 2007
Wireless Networks and Services 10 Years Down the Road Ross Murch Professor, Electronic and Computer Engineering Director, Centre for Wireless Information Technology The Hong Kong University of Science and Technology 1 Wireless Revolution Mobile TV Internet Voice WiFi SMS Email Video Yesterday- 1999 Today- 2009 Millions of wireless devices Billions of wireless devices 2 Wireless Everywhere Medical applications Various Info/Media Distributed Environmental & Bio Sensing Next generation phones Security Smart RFID New Mobile Devices People to People People to machines Machines to Machines Tomorrow- 2019 Trillions of Wireless devices 3 Challenges 4 What is Next for Wireless Communications? In broadband access WiMAX and LTE promise extremely high peak rates However this is just for one user in one cell What happens when we have Trillions of users Wireless aggregated capacity will need to increase enormously How can this challenge be met? 5 Increasing Capacity • What can we do? C Increase Power Cooperative systems Bi log2 (1 Pi / N ) Channels More Channels MIMO Increase Bandwidth Cognitive Radio 6 MIMO- Large M • • • Capacity linear in the number of antennas Makes sense to make N as large as possible Instead of 2 antennas lets use many- 36 or even 100 • Chi Yuk Chiu and , RD. Murch, 24-Port and 36-Port Antenna Cubes suitable for MIMO Wireless Communications, IEEE Transactions Antennas and Propagation, Vol 56, No 4, pp1170-1176, April 2008 7 Cognitive Radio- IEEE 802.22 (WRAN) Deployment Scenario 집 집 집 WRAN Base Station 집 집 집 집 집 Wireless MIC 집 집 집 집 집 집 집 집 집 집 TV Transmitter WRAN Base Station 집 집 집 집 집 집 WRAN Repeater 집 집 Wireless MIC : WRAN Base Station Typical ~33km Max. 100km 집 집 집 집 집 집 집 집 집 집 집 집 집 집 집 : CPE 집 집 집 8 Cooperative Networks • Cooperation between nodes multi-user encoding and decoding relays may exchange information with each other in order to coordinate transmission and reduce interference n R(n) ~ Olog n [GastparVetterli02] R(n) tends infinity Cooperation n 9 What is Next for Wireless Communications? Mobile Computing Embedded Wireless Devices Ubiquitous Computing and Access Multifunction devices and services Agents and Assistants Pervasive Communications 10 Not like this! Source: L Kleinrock, Realizing the Wireless Internet, Keynote, Lecture, IEEE WCNC, Hong Kong 11 Pervasive Communications • Trillions of mobile wireless devices • Devices ubiquitously embedded in the world actuators, sensors, memory, processing, speakers, microphones, cameras, displays • Intelligent software agents deployed To mine data, act on that data, observe trends, and adapt to their environment • Easy configuration and maintenance • The Internet will become essentially a pervasive global system What the internet has done for computers, pervasive communications will do for wireless 12 Easy Configuration and Maintenance • Intelligent software agents could be deployed across the network whose function it will be to Mine data Act on that data Observe trends Carry out tasks dynamically Adapt to their environment 13 Pushing the Wireless Revolution • Revolution in short range wireless communications WLAN, WiFi, IEEE 802.11a/b/g/n Rates up to 54Mbps IEEE 802.11n using MIMO Approx 250Mbps Zigbee Bluetooth UltraWideBand 3.1-10.6GHz band IEEE 802.15.3a 480Mbps within 1-10m RFID Passive UHF- 900MHz 14 Convergence Application Presentation Session Transport Application Presentation Session Transport Network Network Data Link Data Link Physical Physical • Divergence of Physical layers and Applications 15 More Breakthroughs Needed… • Aggregate Wireless Capacity Evolution Fundamentally limited using conventional techniques Cost and Energy Cognitive Radio Cooperative Systems MIMO Efficient protocols Adaptation • Pervasive Communications Revolution Automatic configuration- self configuring Dynamic processing, prediction and actions- agents Energy conservation Miniaturization 16 Wireless Everywhere Medical applications Various Info/Media Distributed Environmental & Bio Sensing Next generation phones Security Smart RFID New Mobile Devices People to People People to machines Machines to Machines Tomorrow Trillions of Wireless devices 17 Thank You! 18