Small Cell Traffic Balancing Over Licensed and Unlicensed Bands
Feilu Liu, Erdem Bala, Elza Erkip, Mihaela C. Beluri, Rui Yang

TL;DR
This paper presents a practical traffic balancing algorithm for small cells operating over licensed and unlicensed bands, improving user utility while managing interference in LTE and WiFi integrated systems.
Contribution
It introduces a real-time traffic balancing algorithm for Dual Band Femtocell and Integrated Femto-WiFi small cells considering device capabilities and interference constraints.
Findings
Significantly increases total user utility.
Effectively manages interference to macrocell.
Applicable to both IFW and DBF small cell architectures.
Abstract
The 3rd Generation Partnership Project (3GPP) recently started standardizing the "Licensed-Assisted Access using LTE" for small cells, referred to as Dual Band Femtocell (DBF) in this paper, which uses LTE air interface in both licensed and unlicensed bands based on the Long Term Evolution (LTE) carrier aggregation feature. Alternatively, the Small Cell Forum introduced the Integrated Femto-WiFi (IFW) small cell which simultaneously accesses both the licensed band (via cellular interface) and the unlicensed band (via WiFi interface). In this paper, a practical algorithm for IFW and DBF to automatically balance their traffic in licensed and unlicensed bands, based on the real-time channel, interference and traffic conditions of both bands is described. The algorithm considers the fact that some "smart" devices (sDevices) have both cellular and WiFi radios while some WiFi-only devices…
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