Transcript Radio Communication

Affordable Wireless Mobile Broadband
Communication & Services
Challenges & Key research areas
Jens Zander
Scientific Director
Center for Wireless Systems
Royal Institute of Technology
Stockholm, Sweden
Wireless Internet - the main 3G driver
• What is “Internet” ?
– To “the man in the street”
= Web-browsing - multimedia
service platform
– Interactive information services
– Streaming audio/video
– Rich exponentially growing
content
– For free….
The cost barrier
Csystem  N user Buser Aservice f (Q)
Nuser= # of users
Buser= Bandwidth(Data rate) per user
Aservice= Intended service area
f(Q) = QoS-dependent capacity margin
Fundamental limitations “Shannons brick wall”
BW
100M
?
10M
1M
WLAN
Equicost/Equipower
line
BT
100K
10K
UMTS
GSM
Body/
Personal
Indoor
Satellit
Local
Wide area
Global
coverage
The two industries…...
The Telecom -Approach
•
Key objective:
–
–
•
Solution:
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–
•
Assertain Service Quality
Simple, basic services
Service guarantees at
network level
Application taylored systems
Consequence:
–
–
High efficiency
Low flexibility
The two industries…...
The DATACOM -Approach
Applications
Applications
Transport
TCP, UDP
Network
IP
Transport
TCP, UDP
Network
IP
Link layer
Link layer
Physical layer
Physical layer
•
Key objective:
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•
Solution:
–
–
–
•
Assertain functionality &
transparancy
Complex services
Layered architecture
Encapsulation
Hide underlying
implementation
Consequence:
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–
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Overhead
Poor performance
Almost no guarantees
The fundamental problem of the traditional
telecom industry…...
Revenue
Applications
Applications
Transport
TCP, UDP
Network
IP
Transport
TCP, UDP
Network
IP
Link layer
Link layer
Physical layer
Physical layer
Cost
Conclusions - Rationale
• Affordability- not expected user
demands - is the key driver for
consumers
• Applications are developed fast
• Infrastructure deployment is slow
• Applications/terminals
(software & Moores law)
can & will adapt to infrastructure
deficiencies
Breaking the cost barrier
Csystem  N user Buser Aservice f (Q)
• Sacrifice bandwidth/compatibility ? (Lower B)
• Sacrifice uniform coverage (Lower A)
• Sacrifice QoS guarantees (Lower f(Q) - delay,
availability..)
”Infrastructure” cost factors
BS Equipment
Deployment
Wired Network
Operating cost
2 paths to affordable infrastructure
Adaptive
Infrastructure
Ad-hoc
Infrastructure
Flexible: Adapt to various services
Adaptive applications - given network
Given applications - adaptive network
Less QoS guarantees - less resources
need to be provided
More efficient - less overprovisioning
of resoruces
Fewer base stations - lower cost
More base stations - radically lower
deployement cost
Affordable infrastructure
Example 1: Smart applications
 Low rate everywhere
 “Infinite” bandwidth - almost
nowhere
 Very low cost
 Adaptive, Smart & Memory
intensive applications!
 Ideal for consumer applications
Moore laws applies to Memory size & MIPS
- not to cables & concrete
Example 2:
Self-deployed/ Ad-hoc networking
• Cost reduction
– Multi-operator or User-deployed
– Self-organizing - organic growth
– Multihop forwarding reduce wired
access network cost
• Partial & sporadic coverage
• Dynamic sharing of the unlicensed
spectrum with (almost) no QoS
guarantees
• The “true wireless internet”!
Some key research issues
• Adapting multimedia applications –
surviving without QoS guarantees & overprovisioning
• Unlicensed / Multi-operator/ Adhoc/Multistandard spectrum sharing
• Scalability
–
Wireless communication everywhere and between
every device ?
• Business models for ubiquitous
computing and communication
Research Roadmap
Services &
Applications
Vision Demonstrator
EMC & Human Interaction
Context Aware Services
Business Models for
Ubiquitous Services
Ubiquitous Services
& Sensors
Informed Audio/Video Coding
Mobile Service
Platforms
Multidescription Coding
Memory intensive apps
SmartMedia
Scalability Mobility Management
Adaptive Infrastructure
Networks
Infrastructure
Business Models
ABC/Multiradio
Access Network
Architecure & Resources
MultiQoS RRM
Large Scale Ad-hoc Networks
Low cost Ad-hoc Network Architecture
Self-deployed systems
Physical layer
Spectrum Management & Licensing
MIMO
GB-radio transmission
Adaptive Radio
Short term ‘02
Medium Term ‘03-04
Long Term ‘05 -