LTE-Advanced HetNet Investigations Under Realistic Conditions

Gerardino, Guillermo Andres Pocovi ; Barcos Sanchez, Sonia

4. term

Wireless Communication Systems, Master

2014

2014-05-27

114

Datatrafikken er vokset eksplosivt, og heterogene netværk (HetNets) – som kombinerer store makroceller med mange småceller – er en nøgle til at levere mere data pr. areal (højere spektral effektivitet). Flere samarbejdsteknikker mellem celler bruges for at forbedre ydeevnen: Range Extension (RE) og enhanced Inter-Cell Interference Coordination (eICIC) ved fælles frekvens (co-channel), samt inter-site Carrier Aggregation (CA) ved dedikerede frekvenslag. Dette studie analyserer, hvordan disse teknikker klarer sig i et stedsspecifikt netværk i det centrale London, sammenlignet med tilfælde uden sådant samarbejde. Standardiserede 3GPP-scenarier antager regelmæssige netværk og jævnt fordelt trafik, men virkelige byområder er langt mere uregelmæssige. Derfor foreslås dynamiske algoritmer til co-channel udrulning, som løbende tilpasser celleselektion og interferenshåndtering (RE + eICIC) efter lokale forhold som belastning og interferens. Resultaterne viser, at den dynamiske tilgang klarer sig væsentligt bedre end statiske indstillinger: den øger brugernes gennemstrømning med op til 120% for 5.-percentilen (de langsomste 5% af brugerne) og 47% for 50.-percentilen (medianen). For dedikerede bærefrekvenser giver inter-site CA også gode resultater med gevinster på op til 100% (5.-percentilen) og 28% (50.-percentilen) sammenlignet med uden CA. Gevinsten ved inter-site CA afhænger af enhedens kanalkvalitet til både makro- og småcellag samt af basestationstætheden i området.

Mobile data demand has surged, and Heterogeneous Networks (HetNets)—which combine large macro cells with many small cells—aim to deliver more data per area (higher spectral efficiency). Several multi-cell coordination techniques are used to improve performance: Range Extension (RE) and enhanced Inter-Cell Interference Coordination (eICIC) when macro and small cells share the same frequency (co-channel), and inter-site Carrier Aggregation (CA) when traffic is placed on dedicated frequency layers. This study analyzes how these techniques perform in a site-specific network model of central London, compared with cases without such cooperation. Unlike standardized 3GPP scenarios with regular layouts and smooth traffic, real city networks are highly irregular. To address this, the study proposes dynamic algorithms for co-channel deployment that continuously adapt cell selection and interference management (RE + eICIC) to local load and interference conditions. The results show that the dynamic approach outperforms static settings: it increases user throughput by up to 120% for the 5th percentile (the slowest 5% of users) and by 47% for the 50th percentile (the median). For dedicated-carrier deployments, inter-site CA also performs well, with gains of up to 100% (5th percentile) and 28% (50th percentile) compared with no CA. The benefit of inter-site CA depends on a device’s channel quality to both the macro and small-cell layers and on the density of base stations in the area.

[This abstract was generated with the help of AI]

HetNet ; RRM ; eICIC ; Carrier Aggregation ; LTE-A ; Real Deployment

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