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Control Plane Design and Implementation for LTE-WLAN Aggregation (LWA)

Abstract

In this paper, we introduce the LTE LWA technology. Based on 3GPP LTE Release 13, main LWA procedures are described. In addition, we implement these scenarios on a platform developed by ITRI (eNB side) and Mediatek (UE side). Peak throughput of LWA of 400 Mb/s can be achieved by aggregating a 100Mb/s LTE base station and a 300Mb/s of Wi-Fi access point. In the future, we will investigate how to use several aggregation technologies (such as CA and LWA) at the same time to gain more bandwidth.

I. INTRODUCTION

D
UE to dramatically increase in mobile data traffic, telecom operators are seeking ways to provide higher bandwidth, wider coverage and better QoS (Quality of Service) with low development cost. Recently several advanced technologies have been proposed to aggregate different LTE carriers or different RATs (Radio Access Technology) to produce higher bandwidth. For example, carrier aggregation groups up to 5 discontinuous LTE component carriers to extend the bandwidth by 5 times. Apart from LTE bandwidth aggregation, Inter-RAT aggregation or offloading is another cost-effective solution to gain bandwidth. For example, LWA (LTE-WLAN aggregation) integrates LTE and WLAN radio resource [2]. Wi-Fi has the advantages of high availability and indoor coverage, which are often used by telecom operators to supplement the bandwidth need of existing mobile infrastructures (e.g., LTE). Traditionally, Wi-Fi and LTE are independently operated. Recently, LWA has been considered to provide better usage of Wi-Fi and LTE. For example, the collaboration between ASTRI (Hong Kong Applied Science and Technology Research Institute) and PCCW (Pacific Century Cyber Works) Group in Hong Kong was announced in October, 2016 [1].

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