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Traffic-Aware Base Station Sleeping Control with Cooperation for Energy-Delay Tradeoffs in Multi-cell Cellular Network
KTH, School of Electrical Engineering (EES), Communication Theory.
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

From an energy eciency viewpoint of improving the cellular access networks,

the power consumption of the whole system needs to be tracked. In this project,

a theoretical model is studied which jointly encompasses sleep control strategy

and Base Station (BS) cooperation polices, our goal is to obtain a Pareto Op-

timal tradeo between energy consumption and average delay time. Based on

the trac load variation, the sleep control strategy is proposed by adjusting

the BS working mode. This project focuses on the multi-cell network which is

more close to the real world. In multi-cell scenario, except for the design of the

sleep control, the issues of BS cooperation and the inter-cell interference also

need to be covered. Furthermore, based on the multi-cell network, three types

of energy saving strategies are considered: In case I, users only can be served

by their own Base stations (BSs) which go to sleep mode when there is no ac-

tive user and will not wake up until N users need to be served. This strategy

leads to a good energy performance but the long delay. To reduce the average

delay, therefore, in case II, we introduced the user association policies that the

network handover the user to his adjacent BSs when his own BS is in the sleep

mode. Furthermore, the relay-assisted network was studied in the case III. Fi-

nally, Based on theoretical and simulation results, we compared these tree cases

under the given trac conditions from the perspective of achieving the optimal

average energy-delay tradeo . And also we found out that sacricing network

throughput can yield the energy saving if we carefully design the network.

Abstract [sv]

Ur energie ektivitetssynpunkt att frbttra de cellulra accessnten, mste e ekt-

frbrukningen fr hela systemet som ska spras. I detta projekt r en teoretisk

modell studerat vilka tillsammans omfattar smnkontrollstrategi och basstatio-

nen (BS) samarbetspolitiken, r vrt ml att f en Pareto Optimal avvgning mellan

energifrbrukning och genomsnittlig frdrjning. Baserat p trakbelastning varia-

tionen r smnkontrollstrategi fresls genom att justera BS arbetslge. Detta projekt

fokuserar p multicellntverk som r mer nra den verkliga vrlden. I ercells sce-

nario, med undantag fr utformningen av smnkontroll, frgor om BS samarbete

och intercell interferens mste ocks tckas. Dessutom bygger p ercellsntverk, r tre

typer av sparenergistrategier beaktas: I fall jag, anvndarna endast kan betjnas

av egna Basstationer (BSS) som gr till vilolge nr det inte nns ngon aktiv an-

vndare och kommer inte vaknar tills N anvndare behver delges. Denna strategi

leder till en god energiprestanda men den lnga frseningen. Fr att minska den

genomsnittliga frseningen drfr ifall II infrde vi de anvndar freningens policy att

ntverket lmnandet anvndaren att hans intilliggande BS nr hans egen BS r i

vilolge. Vidare relet assisterade nt studerades i fallet III. Slutligen Baserat p

teoretiska och simuleringsresultat, jmfrde vi dessa trd ml enligt de givna trak-

frhllandena ur perspektivet att uppn den optimala genomsnittliga energifrdrjn-

ings avvgning. Och ven vi ck reda p att o ra ntverksgenomstrmning kan ge

energibesparingar om vi noggrant utforma ntverket.

Place, publisher, year, edition, pages
2015. , 41 p.
EES Examensarbete / Master Thesis, XR-EE-KT 2015:002
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-165096OAI: diva2:807350
Educational program
Master of Science - Wireless Systems
Available from: 2015-04-23 Created: 2015-04-23 Last updated: 2015-04-23Bibliographically approved

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