How much can Wi-Fi offload? A large-scale dense-urban indoor deployment study

Liang Hu, Claudio Coletti, Huan Cong Nguyen, Preben Mogensen, Jan Elling

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16 Citationer (Scopus)

Abstract

This paper is envisaged to provide a first quantitative study on how much indoor deployed Wi-Fi can offload the operator’s 3G HSPA macro cellular networks in a real largescale dense-urban scenario. Wi-Fi has been perceived as a costeffective mean of adding wireless capacity by leveraging low-cost access points and unlicensed spectrum. However, the quantitative offloading gain that Wi-Fi can achieve is still unknown. We studied the Wi-Fi offloading gain as a function of access point density, where it is shown that 10 access points/km2 can already boost average user throughput by 300% and the gain increases linearly proportional to the access point density. Indoor Wi-Fi deployment also significantly reduces the number of users in outage, especially for indoor area. A user is considered to be in outage if they have a user throughput less than 512 kbps. We also propose three Wi-Fi deployment algorithms: Traffic-centric, Outage-centric, Uniform Random. Simulation results show that Traffic-centric performs best in boosting average user throughput while Outage-centric performs best in reducing user outage. Finally, Wi-Fi offloading solution is compared with another offloading solution – HSPA Femto cell. We show that Wi-Fi provides both much higher average user throughput and network outage reduction than HSPA Femto cells by exploring
20 MHz unlicensed ISM band.
OriginalsprogEngelsk
Titel75th Vehicular Technology Conference (VTC Spring), 2012 IEEE
Antal sider6
ForlagIEEE Press
Publikationsdato2012
ISBN (Trykt)978-1-4673-0989-9
ISBN (Elektronisk)978-1-4673-0988-2
DOI
StatusUdgivet - 2012
Begivenhed2012 IEEE 75th Vehicular Technology Conference - Yokohama, Japan
Varighed: 6 maj 20129 maj 2012

Konference

Konference2012 IEEE 75th Vehicular Technology Conference
Land/OmrådeJapan
ByYokohama
Periode06/05/201209/05/2012
NavnI E E E V T S Vehicular Technology Conference. Proceedings
ISSN1550-2252

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