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Pricing and Power Control in a Multicell Wireless Data Network. Po Yu Chen October, 2001 IEEE Journal on Select Areas in Communications. Prolog. The data services in wireless networks necessitate efficient and efficiency radio resource management Power control is important in CDMA system.

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pricing and power control in a multicell wireless data network

Pricing and Power Control in a Multicell Wireless Data Network

Po Yu Chen

October, 2001

IEEE Journal on Select Areas in Communications

prolog
Prolog
  • The data services in wireless networks necessitate efficient and efficiency radio resource management
  • Power control is important in CDMA system
outline
Outline
  • Introduction
  • Approach
  • Simulation Result
  • Conclusion and Discussion
introduction 1 2
Introduction (1/2)
  • Why using power control ?
    • To provide each signal with adequate quality without causing unnecessary interference to other signals
    • To minimize the battery drain in portable terminals
introduction 2 2
Introduction (2/2)

Paper Concept

  • Extend reference [5] (single-cell environment) to multi-cell environment
  • Power control for data network under a new light, powered by mathematics and concepts from microeconomics
  • Pricing scheme to improve utility with respect to both the transmit power and BS assignment
key word
Key word
  • Utility function: measure performance in bits per joule (bits/joule)
  • Nash equilibrium: no user has any incentive to change its power level since no individual improvement in utilities is possible
  • Non-cooperative game: terminals operating independently to achieve best performance (a distributed power control algorithm )
  • Cooperative game: a centralized power control algorithm
utility function nash equilibrium
Utility function & Nash equilibrium

將Nash equilibrium 帶入所得之結果

functions
Functions
  • SIR
  • Utility function:包含了SIR和power control的訊息

hij: path gain

pj: power of user j

W: bandwidth

R: data rate

L/M: code rate , f(.):能成功被接收的機率

bs assignment based on mrss 1 2
BS Assignment Based on MRSS (1/2)
  • MRSS (Max. Received Signal Strength)
  • aj:被assigned給j的BS
  • hij:path gain
  • dij:distance between terminal and BS
bs assignment based on mrss 2 2
BS Assignment Based on MRSS (2/2)
  • 固定了BS assignment的方法,所以只剩下power control的變數
  • Multi-cell power control game (MCPG)
  • P-j: interference power vector, but not include pj
bs assignment based on msir 1 2
BS Assignment Based on MSIR (1/2)
  • Generalize the MRSS,將BS assignment也考慮進來。
  • 方法:將有最大SIR值的BS assign給terminal
  • 所以在這裡BS assignment也變成了一個變數
bs assignment based on msir 2 2
BS Assignment Based on MSIR (2/2)
  • MCPG的utility function (two dimension)
  • 簡化問題,分成兩項討論:
  • 先解決BS assignment的問題(MAX SIR)

再處理power control的問題

pricing 1 2
Pricing (1/2)
  • Define: every transmit power has pricing
  • 加入pricing後的結果:

new utility function

  • ci:the pricing factor announced by BS
  • Alpha is a scalar, Ni is the number of the terminals assigned to BS
pricing 2 2
Pricing (2/2)
  • Pricing分為兩種:

--Global Pricing

--Local Pricing

ci is based on the amount of traffic that is offered in its service area

power control game with pricing
Power control game with Pricing
  • For MCPG-MRSS
  • For MCPG-MSIR
best equal sir
Best equal-SIR
  • Good for MCPG (no pricing, the same SIR) dependent on local information
  • A centralized scheme,由BS來計算Terminal的SIR
  • BS need to announce the best SIR
  • The terminal needs to be applied an SIR balancing algorithm
system model
System Model
  • Multi-cell CDMA data system
  • N=28 terminals
  • K=4 base stations
  • Frame size is fixed
  • No forward error correction
  • Simple path loss
result 1 4 utility
Result (1/4)--utility
  • Compare MCPG/MSIR and MCPGP/MSIR(LP)
result 2 4 power in cell
Result (2/4)--power in cell
  • Compare MCPG/MSIR and MCPGP/MSIR(LP)
result 3 4 utility
Result (3/4)--utility
  • Compare MCPG/MRSS and best equal-SIR
result 4 4 power in cell
Result (4/4)--power in cell
  • Compare MCPG/MRSS and best equal-SIR
conclusion
Conclusion
  • 此篇利用microeconomics的concept和mathematics來引導結果—證明加入pricing scheme有助於效能提升
  • 傳data和傳Voice的方法不同,所以MRSS不能夠保證data的QoS,因為power最大並不代表SIR就大。
discussion
Discussion
  • 作者並沒有比較MRSS和MSIR,所以我們就不知道Best equal-SIR有沒有比MSIR好,因為這就是Centralized和Distributed power control的比較
  • Utility的可信度
  • 缺乏其他參數的實驗數據,不知是否影響其的參數的performance
  • 個人覺得此實驗的model不夠完整,實際狀況應更為複雜
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