Nam Nguyen and Takuro Sato
Graduate School of Global Information and Telecommunication Studies
Waseda University, Tokyo, Japan
ABSTRACT
WiFi offloading is becoming one of the key enablers to help the network operators dealing with the
exponentially growing demand of mobile data. The idea of using WiFi to offload data traffic from cellular
network has proposed for many years. However, the interoperability issue between the two networks needs
to be enhanced so that WiFi can efficiently supplement for the cellular network in case of congestion or
outage. In this paper, we propose a novel network roaming and selection scheme based on 3GPP TS
24.312 and IEEE 802.11k, u standards to enhance cellular and WiFi interworking. The proposed scheme is
aimed at enhancing the network roaming and selection so that WiFi network can serve as a supplement and
backup access network for the cellular not only for congestion control but also in case of unexpected
network failure event. We also model and evaluate the proposed scheme in a typical HetNet with
interworking WiFi access points and cellular base stations. The simulation result shows that our proposed
scheme quickly detects unexpected network failure event and assists active UEs to perform handoff to
preferable alternative point of access. As a result, service disruption is substantially reduced and quality of
experience (downlink/uplink’s throughput) is improved. Therefore, our proposed scheme can be used for a
more reliable HetNet in terms of congestion control and disruption tolerance.
KEYWORDS
WiFi cellular interworking; reliable HetNet; congestion control; network failure tolerance.
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