Title: SIFM: A network architecture for seamless flow mobility between LTE and WiFi networks - Analysis and Testbed Implementation,
Abstract: This paper deals with cellular (e.g. LTE) networks that selectively offload
the mobile data traffic onto WiFi (IEEE 802.11) networks to improve network
performance. We propose the Seamless Internetwork Flow Mobility (SIFM)
architecture that provides seamless flow-mobility support using concepts of
Software Defined Networking (SDN). The SDN paradigm decouples the control and
data plane, leading to a centralized network intelligence and state. The SIFM
architecture utilizes this aspect of SDN and moves the mobility decisions to a
centralized Flow Controller (FC). This provides a global network view while
making mobility decisions and also reduces the complexity at the PGW. We
implement and evaluate both basic PMIPv6 and the SIFM architectures by
incorporating salient LTE and WiFi network features in the ns-3 simulator.
Performance experiments validate that seamless mobility is achieved. Also, the
SIFM architecture shows an improved network performance when compared to the
base PMIPv6 architecture. A proof-of-concept prototype of the SIFM architecture
has been implemented on an experimental testbed. The LTE network is emulated by
integrating USRP B210x with the OpenLTE eNodeB and OpenLTE EPC. The WiFi
network is emulated using hostapd and dnsmasq daemons running on Ubuntu 12.04.
An off-the-shelf LG G2 mobile phone running Android 4.2.2 is used as the user
equipment. We demonstrate seamless mobility between the LTE network and the
WiFi network with the help of ICMP ping and a TCP chat application.