FLEX project will deployi n NITOS and Eurecom facilities, a LTE testbed using highly configurable Open Source LTE components on a FPGA setup, which will allow the full redesign of the system. This setup will be based on the OpenAirInterface platform and will be similar to the one of the commercial hardware (hierarchical developed ENodeBs connected to the OpenAirInterface Evolved Packet Core Lite). The main difference is that it provides open-source components and will be used for experimentation that involves modifications in the main functionality of the main components of the LTE network (EPC network, eNodeB’s operation).
OpenAirInterface is a FPGA based system that is fully programmable though open source software. In particular, the setup includes the following components:
- OpenAirInterface Evolved Packet Core Lite: EURECOM provides a basic Evolved Packet Core network, which contains the main elements of a 3GPP-compliant LTE EPC.
OpenAirInterface eNb solutions: EURECOM provides an ExpressMIMO card, which is the hardware platform for baseband DSP. It targets baseband signal processing for system complexities up to and including UMTS-LTE with up to 4 antennas. It can be deployed both in indoor and outdoor spaces based on the following eNodeBs:
- Macro-cell eNodeB
- Pico-cell eNodeB
OpenAirInterface User Equipment connected to Android: For the needs of this setup two different types of UE will be used. Commercial Android mobile phones and fixed location nodes, consisting of CardBus MIMO clients. The second type of UE is a dual-RF (dual-frequency or dual-antenna) system with both data acquisition and DSP functionality in a very small form-factor (PCMCIA/CardBus) and can be connected to fixed nodes and Laptops.
The figure below indicates the overview architecture of the OpenAirInterface in Eurecom.
- Experimentation with new PHY layer schemes in LTE that will be implemented from scratch.
- Evaluation and testing of new scheduling algorithms on the MAC layer of the LTE eNodeBs.
- Implementation and evaluation of cooperative networking schemes in LTE (where end-users can be packet forwarders between the eNodeBs and other end-users).
- Evaluation and testing of new rate adaptation algorithms in the MAC layer of LTE.