Varsha Jain, Prof. Gerard Parr, Dr. Philip Morrow

EPSRC-DST India-UK Centre of Excellence in Next Generation Networks Systems and Services

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STB

Wireless LAN

Firewire IEEE 1394

sensors

ZIGBEE/BLUETOOTH

xDSL access

Wifi phone

Analog phone

laptophomegateway

TV

Sensors detects the person at home

listening/sleep/active

Active/sleep modeIP connectivity

On/Off

storage

Edge- router

BNG/BRAS

Ethernet switch

Access NetworkCore-Metro IP network

Data centers

WiMAX

OLT

LAN

IPTV VOD

YouTube

Sensing/on/off

sleep

Power-off

L2/L3 low power state

Power ON/OFF/low power clouds

Power ports ON/OFF

Power management mechanisms can affect the networks application behaviour such as performance (QoS and QoE) and availability. Network is highly dynamic in terms of varying access technologies (Wireless, Wired and optical) and their respective different power management capabilities.

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An application can operate at n different performance (QoS) levels, denoted A0, A1... An,

For each A-state have optimal network system configuration, including choice of hardware and power management settings.

The key idea is to automatically select power management settings that keep the networks from access to HG and further customer-end- system all along operate close to the optimal curve.

Qmax

Emax Emin

A0

A1

A2

A3

0

xy

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We examine the test cases into two different access networks; (1) ADSL (2) WiMAX.

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WiMAX – video conferencing packet delay variation vs. energy consumption

ADSL voice packet delay variation vs. energy consumption

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ADSL-video conferencing packet delay variation vs. energy consumption

WiMAX voice delay variations vs. energy consumption

We analysed the inter-relationship between energy consumption and application performance.

ADSL technology highly degrades the application performance in case of low power state while WiMAX is better suited for real time applications at the same time, is more energy efficient in specific conditions.

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