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Channel Access Algorithms with Active Link Protection for Wireless Communication Networks with Power Control. Nicholas Bambos, Shou C. Chen, Gregory J. Pottie. Agenda. Overview Motivation (Problem statement) Foundation work DPC/ALP algorithm Properties of DPC/ALP algorithm

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Channel Access Algorithms with Active Link Protection for Wireless Communication Networks with Power Control

Nicholas Bambos, Shou C. Chen, Gregory J. Pottie


Agenda l.jpg
Agenda Wireless Communication Networks with Power Control

  • Overview

  • Motivation (Problem statement)

  • Foundation work

  • DPC/ALP algorithm

  • Properties of DPC/ALP algorithm

  • Extensions to algorithm VDO and FDO

  • Simulation results and extensions

  • Comments


Overview dpc alp l.jpg
Overview: DPC/ALP Wireless Communication Networks with Power Control

  • DPC: An Algorithm for transmit power control

    • Adaptive

    • Distributed

    • On-line

    • Different QoS levels

  • ALP: Admission control algorithm

    • Protect existing users form disruption

    • Method for new users to enter wireless network

    • “Smooth dynamics”


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Motivation (Problem Statement) Wireless Communication Networks with Power Control

  • Power control with

    • Entry and

    • Egress from the network

  • While maintaining QoS

    • For existing users

Admissible?


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Model Wireless Communication Networks with Power Control

QoS constraint


Foundation work dpc l.jpg
Foundation Work: DPC Wireless Communication Networks with Power Control

  • Distributed Power Control

    • P(k+1)=FP(k)+u

    • P->P* where

  • But

    • Convergence path may lead to “outage” or QoS problems

  • Alternative form:

Foschini and Miljanic


Dpc alp algorithm l.jpg
DPC/ALP Algorithm Wireless Communication Networks with Power Control

  • Based on DPC (above)

  • Active link protection – Ensures existing users QoS is maintained when new users are added.

  • Distributed admission control

  • Extended – Voluntary drop out Mechanism for “hot spots”


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new Wireless Communication Networks with Power Control

DPC/ALP Algorithm – continued

admitted

Geometric power up

Protection margin or buffer zone


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Properties of DPC/ALP Wireless Communication Networks with Power Control

  • User is admitted when

    • Once admitted continuously admitted

    • bounded power overshoot

  • New users

    • Increasing SIR’s

    • If admissible then admitted in bounded time

  • But infinite power may be required

Admissibility vs. admissibility


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DPC/ALP/VDO Wireless Communication Networks with Power Control

  • Voluntary Drop-Out

    • When too many new users none wins

    • Solution is one or more links backs off

  • Types of VDO

    • Coin flipping after a parameterized number of tries

    • Timer based


Dpc alp vdo fdo l.jpg
DPC/ALP/VDO/FDO Wireless Communication Networks with Power Control

  • Power constraint

  • FDO – forced drop out

    • Active user nears max

    • Signals local users seeking admission to drop out

    • Reduces contention for resources


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Simulation results Wireless Communication Networks with Power Control

  • VDO

    • Increases number of users significantly

    • Results in backlog of users not yet admitted

      • Threshold effect for great enough arrival rate of new users! Clogging effect

  • VDO and FDO

    • Decrease in time to admission

    • Higher through-put

Hot spots

Congestion control


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Extensions Wireless Communication Networks with Power Control

  • Probing

    • Predict admissibility from two SIR samples

Solve for X Y

Admit after k=


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Comments Wireless Communication Networks with Power Control

  • Dynamics of admission control

    • Critical to ad-hoc networks

    • Rapidly changing user group

  • Results are very parameter sensitive


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