The new post-OFDM multicarrier waveform, a block filtered-OFDM (BF-OFDM), can overcome all shortcomings inherent in actual LTE waveforms and is backward compatible with existing LTE receivers. An innovative medium access control (MAC) layer will demonstrate multiservice and coexistence with primary systems. More advanced features of future 5G networks will also be investigated, such as in-band full-duplex (IBFD). The results of these field trials will enhance Leti’s technology-to-system offer for its industrial partners in the context of 5G telecom applications and ad-hoc proprietary radio solutions for vertical sectors.
To this end, Leti recently was granted a six-month license from Arcep, France’s telecommunications regulatory agency, to run a field trial with multiservice transmission at 3.5 GHz TDD band with 40 MHz bandwidth. This frequency was chosen as 3.5 GHz might be the first carrier frequency that will be released for 5G.
“4G networks are quickly reaching their limits in capacity and capabilities to address new classes of services, such as massive machine-type connectivity and ultra-low-latency and ultra-reliable communications,” said Dimitri Ktenas, Leti wireless lab manager. “Anticipating these challenges, the 3rd Generation Partnership Project (3GPP) began discussing radio access network (RAN) requirements in the fall of 2015 and further discussions produced a consensus that there would be a new, non-backward compatible, radio access technology as part of 5G, targeting a first release in mid-2018.”
The new air interface called new radio (NR) targets a single technical framework addressing enhanced mobile broadband (eMBB), massive machine-type communications (mMTC) and ultra-reliable and low latency communications (URLLC). NR also is expected to offer additional support for very high velocities, and these diverse services support a highly flexible waveform allowing very different configurations.