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. / 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.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:kth-165096 |
| Date | January 2015 |
| Creators | Wang, Jia |
| Publisher | KTH, Kommunikationsteori |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | EES Examensarbete / Master Thesis ; XR-EE-KT 2015:002 |
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