Korea Advanced Institute of Science and Technology Network Systems Lab. Autonomic Wireless: the Next Wireless Professor Song Chong Network Systems Laboratory EECS, KAIST

Korea Advanced Institute of Science and Technology Network Systems Lab. 4G Cellular The deployment of 4G sometime around might look like a fairly certain bet. Definition of 4G is still opaque. 4G will not be a new air interface, unlike 3G, and perhaps may not even emerge.

Korea Advanced Institute of Science and Technology Network Systems Lab. 4G Cellular Each generation has accepted a smaller cell size in return for a higher data rate. The next step in the process, where 4G might logically fit, is already taken by a mix of 3G enhancements, WiMax and WiFi. E.g., the Japanese plan for 4G (OFDM, 3-6 GHz band, 100 Mbps) is almost identical to the specification for a 4G systems, if realized, can be economically deployed only in high-density areas. A further increase in air interface data rate is pointless without better backhaul technologies. E.g., insufficient speed of ADSL Backhaul for WiFi cells Implication: 4G is likely to be a “WiFi-like small-cell technology” for dense infrastructure with better backhaul technologies and its deployment is economically justifiable only in high-population or capacity-hungry areas.

Korea Advanced Institute of Science and Technology Network Systems Lab. Cooper’s law The number of voice calls carried over radio spectrum in personal communications has improved a million times since A 15 times by allocating more spectrum, a 5 times by frequency division, a 5 times by enhancing PHY techniques The lion’s share of the improvement, a 2700 times, was the result of effectively confining individual conversations to smaller and smaller areas by spatial reuse of spectrum.

Korea Advanced Institute of Science and Technology Network Systems Lab. Threat to 4G Cellular: WiFi Evolution

Korea Advanced Institute of Science and Technology Network Systems Lab. Autonomic Wireless Access: Vision Small-cell network with multi-hop wireless/wired backhaul Flat architecture with seamless mobility support Autonomic (self-configured, -managed, -optimizing etc.) Wireless-technology neutral and pluggable/programmable Distributed control and management Network virtualization Network of things

Korea Advanced Institute of Science and Technology Network Systems Lab. Experimentally-driven Future Wireless Access Research Testbed at KAIST Open testbed for experimentally-driven wireless architecture & protocol design Campus-scale hybrid wireless mesh network 56 mesh routers (3x b/g): 16 indoor & 40 outdoor 50 sensor nodes ( ) WiVi monitoring and management tool On-going work: virtualization, common code architecture, SDR extension

Korea Advanced Institute of Science and Technology Network Systems Lab. No.8 Topology [Nodes]

Korea Advanced Institute of Science and Technology Network Systems Lab. Hardware Wireless Mesh Network Small form-factor PC Pentium CM 1.4GHz 512MB RAM, 60G HDD Wireless interfaces Ralink rt2x00 (802.11b/g) x 3 Serial monkey driver Sensor Mesh Network (xbow) Network Interface: MIB – MICAz MPR2400 ATMega128 (AVR), TinyOS, ZigBee. Sensor MTS300: Light, temperature, acoustic MTS420: MTS300 + barometer, seismic, GPS MPR2400 MTS300MTS420 MIB600

Korea Advanced Institute of Science and Technology Network Systems Lab. Common Code Architecture GloMoSim protocol stack  testbed protocol stack Easier way to experiment clean-slate protocols including overlay MAC Application Transport Network Logical Link MAC Physical Propagation Event Scheduler OS (Linux) A T N L M P A T N L M P App. Adaptor Protocol Stack Event Scheduler H/W Adaptor OS (Linux) D/D MAC No. 10 Common Code Base Application Overlay MAC GloMoSim SimulatorTestbed Node

Korea Advanced Institute of Science and Technology Network Systems Lab. Clean-slate Access & Backhaul Architecture B D C E F E F E F A E Uplink Access Queue Downlink Access Queue E F E F F X Y Aggregation Queue Backhaul Repository Access Repository Aggregation Queue DB=X-Y Wireless

Korea Advanced Institute of Science and Technology Network Systems Lab. Network Virtualization No. 12 MAC1 MAC2 PHY Virtualization Layer LAYER 3 LAYER 4 LAYER 5 Channel 1Channel 11 Linux Kernel User Space VLVL Agent Firmware Driver Firmware S1S2S3 VL/Pkt-Slice Classifier S1S2S3 VL/Pkt-Slice Classifier Logical Connection Asynchronous Network-wide Virtualization

Korea Advanced Institute of Science and Technology Network Systems Lab. WiVi Monitoring & Management Tool

Korea Advanced Institute of Science and Technology Network Systems Lab. KAIST Mobile Mesh Router Whole New Platform (UMPC base) Linux (Ubuntu) Low-power CPU (500 MHz / AMD Geode) Long Battery Life (12 Hours) 2 WLANs(rt73) with High Gain Antenna (5dBi) Aluminum Housing (Total Weight ~ 1.2kg) Prototype 215 mm 115 mm 65 mm

Korea Advanced Institute of Science and Technology Network Systems Lab. KAIST Wearable Computing Testbed Objectives - Developing a next-generation wearable PC based on WearNet - Developing ubiquitous computing based on WiSEMesh

Korea Advanced Institute of Science and Technology Network Systems Lab. KAIST Wearable Computing Testbed [Multimodal Communication (Wlan/Zigbee Coexistence)] [Location Free Conference System][Fashionable UFC terminal concept] [Wearable UFC] [High-spec Terminal] [Low-spec Terminal] [Wearable UFC ]