Microeconomics based Bandwidth Management for Wireless Multimedia Applications

1
Microeconomics based Bandwidth Management for
Wireless Multimedia Applications

• Johan Kristiansson
• Department of Computer Science Electrical
  Engineering, Division of Media Technology
• Luleå University of Technology
• Sweden
• Pricing for communication network
• 040604

2
Agenda

• Introduction
• Microeconomics
• Architecture
• Evaluation
• Discussion

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Introduction

• Future wireless systems
• Overlapping heterogeneous networks
• Problems
• Bandwidth and financial cost
• Always Best Connected
• QoS and Mobile IP
• Maximize the total benefit of users applications
  
• Solve as much as possible end-to-end

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Multimedia applications

• Involves many media
• Audio
• Video
• Chat
• Shared Whiteboard
• Optimizing one media is insufficient
• How can bandwidth be allocated/distributed among
  media so that the users total benefit is
  maximized?

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Microeconomics

• Deals with production, purchase and sales of
  commodities in limited supply
• Three key players
• Consumers
• Suppliers
• Regulators
• Pricing is used to regulate the market
• Use microeconomics to allocate/distribute
  bandwidth within applications
• Virtual economy

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Overview of the architecture
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Interaction between agents
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Resilient Mobile Socket

• Application layer mobility scheme for UDP

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Network contracts

• Network contracts are traded
• Price
• Byte limit
• Expire time
• Quality vector
• Jitter, RTT, etc

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Two optimization problem

• Local optimization
• Maximize the benefit of each media
• Global optimization
• Maximize the benefit of the whole multimedia
  application

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Local optimization

• Bandwidth Negotiator Agents

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Local optimization

• Sender calculates bit-rate that is best for the
  receiver
• However, it can cost money to send a packet as
  well
• Hence,

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Global optimization

• Bandwidth Regulator Agents
• Regulates the price to provide fairness
• Affects only x , i.e. optimal receiver send-rate

R

• Problems
• Equilibrium is not always reached

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Competitive market models

• Pareto optimal allocation
• Tâtonnement process

• Problems
• The system is not equitable
• No consideration to the real cost

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Spot-markets and the real market

• A new model for bandwidth management

• Problems
• How is the supply, s, calculated/estimated?

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Calculating the supply

• Equation-based congestion control (TFRC)

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Evaluation

• Proof of concept prototype
• Marratech Pro
• Questions that need some answers
• Is the system stable?
• Is the system fair and equitable?
• Is a Pareto optimal allocation obtained?

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Evaluation

• Parameters that can be studied
• Variation in demand
• Does VBR media cause oscillations?
• Variation in supply
• Network load
• Mobility
• Network contracts
• Weights

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Discussion

• Micro-economy
• Virtual economy vs. a real economy
• Transparency
• Application completely unaware of how the
  communication is done
• Users
• The total utility of the multimedia application
  is maximized

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Questions?

• Contact information
• johan.kristiansson_at_csee.ltu.se
• http//www.cdt.luth.se/johank
• Division of Media Technology
• http///media.sm.luth.se