LTE-Wi-Fi Interworking

Demand from data hungry applications in smartphones/tablets brings a significant traffic load onto mobile networks. Wi-Fi in unlicensed spectrum provides a lot of bandwidth. Hence 3GPP has started work on integrating LTE and Wi-Fi to offer high data rates for indoor users. Initially this integration is realised by bringing in Wi-fi network into cellular packet core (EPC) through Packet-Gateway. For more fine control over these LTE and Wi-Fi interfaces, a closer level of interworking is required. Hence a new LTE-Wi-Fi aggregation (LWA) is brought in with tight integration at access link level by 3GPP. We proposed an IP level LWA architecture which introduces no change at the protocol stack of User equipments (UEs) and offers higher system capacity. We have realized this architecture on LENA NS-3 and a testbed by using Eurecom's OpenAirInterface (OAI) LTE, off-the-shelf Wi-Fi APs and commercial smartphones (e.g., iPhone and Nexus 5/6). NeWS lab @ IITH is conducting research work to design and develop various interworking architectures and traffic steering algorithms for both co-located and non co-located LWA scenarios.


Research Scholars: Thomas V PascaSumanta Patro  Prashant Sharma

A White Paper on Tight Coupling of LTE Wi-Fi Radio Access Networks [ Document , Video ]


                                                                                                          Co-located LWIP testbed framework @ IITH


  • Prasanth Sharma, Ajay Brahmakshatriya, Thomas V. Pasca, Bheemarjuna Reddy Tamma and Antony Franklin, "LWIR:LTE-WLAN Integration at RLC Layer with Virtual WLAN Scheduler for Efficient Aggregation", in Proc. of IEEE Globecom, December 2016.

  • Thomas Valerrian Pasca S, Akilesh B, Arjun V Anand and Bheemarjuna Reddy Tamma, "A NS-3 Module for LTE UE Energy Consumption",in Proc. of IEEE ANTS, November 2016.

  • Prashant Sharma, Thomas Valerrian Pasca S, Naveen Kamath and Bheemarjuna Reddy Tamma,"Velocity Based Dynamic Flow Mobility in Converged LTE/Wi-Fi Networks " in Proc. of NCC, March 2016, IIT Guwahati, India. [Slides]

  • Thomas Valerrian Pasca S, Sumanta Patro, Bheemarjuna Reddy Tamma, and Antony Franklin A, "Tightly Coupled LTE Wi-Fi Radio Access Networks: A Demo of LWIP",  in Proc. of COMmunication Systems and NETworkS (COMSNETS 2017), January 2017.

  • Thomas Valerrian Pasca, Bheemarjuna Reddy Tamma, and Antony Franklin, "VISIBLE: Virtual Congestion Control with Boost ACKs for Packet Level Steering in LWIP Networks", accepted for presentation in IEEE GLOBECOM, December 2017, Singapore.

  • Thomas Valerrian Pasca, Himank Gupta, Bheemarjuna Reddy Tamma, and Antony Franklin, "PRECISE: Power Aware Dynamic Traffic Steering in Tightly Coupled LTE Wi-Fi Networks", accepted for presentation in IEEE PIMRC, October 2017, Montreal, QC, Canada.

Source Code:

Open Source Implementation: LTE Energy Module in NS3


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