Korea Advanced Institute of Science and Technology

Network Systems Lab.

Autonomic Wireless:the Next Wireless

Professor Song ChongNetwork Systems Laboratory

EECS, KAISTsong@ee.kaist.ac.kr

Korea Advanced Institute of Science and Technology

Network Systems Lab.

4G Cellular

The deployment of 4G sometime around 2014-2018 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 802.11a

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 cellsImplication: 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 1950.

A 15 times by allocating more spectrum, a 5 times by frequency division, a 5 times by enhancing PHY techniquesThe 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 backhaulFlat architecture with seamless mobility support Autonomic (self-configured, -managed, -optimizing etc.)Wireless-technology neutral and pluggable/programmableDistributed control and managementNetwork virtualizationNetwork 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 designCampus-scale hybrid wireless mesh network

56 mesh routers (3x802.11 b/g): 16 indoor & 40 outdoor50 sensor nodes (802.15.4)WiVi monitoring and management tool

On-going work: virtualization, common code architecture, SDR extension

Mesh

Node

Korea Advanced Institute of Science and Technology

Network Systems Lab.No.8

Topology

[Nodes]40 + 16

Korea Advanced Institute of Science and Technology

Network Systems Lab.

Hardware

Wireless Mesh NetworkSmall form-factor PC

Pentium CM 1.4GHz512MB RAM, 60G HDD

Wireless interfacesRalink rt2x00 (802.11b/g) x 3Serial monkey driver

Sensor Mesh Network (xbow)Network Interface: MIB600802.15.4 – MICAz

MPR2400• ATMega128 (AVR), TinyOS, ZigBee.

SensorMTS300: Light, temperature, acousticMTS420: MTS300 + barometer, seismic, GPS

MPR2400

MTS300 MTS420

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

LinkMAC

PhysicalPropagation

Event SchedulerOS (Linux)

ATNLMP

ATNLMP

App. Adaptor Protocol

Stack

Event Scheduler

H/W AdaptorOS

(Linux)D/DMAC

No. 10

Common Code Base Common Code Base

Application

Overlay MAC

GloMoSim Simulator Testbed 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

AE

UplinkAccess Queue

DownlinkAccess Queue

E

F

E

F

F

X

Y

Aggregation Queue

BackhaulRepository

AccessRepository

Aggregation Queue

Aggregation Queue DB=X-Y

Wireless

Korea Advanced Institute of Science and Technology

Network Systems Lab.

Network Virtualization

No.12

MAC1 MAC2

PHY PHY

Virtualization Layer

LAYER 3LAYER 4LAYER 5

Channel 1Channel 11

LinuxKernel

UserSpace V

LAgent

Firmware

Driver

Driver Firmwa

re

S1 S2 S3

VL/Pkt-Slice Classifier

S1S2S3

VL/Pkt-Slice Classifier

LogicalConnection

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 RouterWhole 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 TestbedObjectives - 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 ]