For ICT systems to cope with the rapidly increasing growth of needed data transmission rates there is a need for a flexible, scalable and future-proof solution for seamlessly interfacing the wireless and photonic segments of communication networks. In addition, emerging paradigms such as 5G communications, the internet of things (IoT), car-to-car communications, wireless body and personal area networks (WB/PANs), and high-resolution sensing are expected to push this pressure even further. The requirements demanded by most of these scenarios call for novel technology developments in both the physical layer and the network architectures. For instance, 5G wireless communications targets a 1000-fold increase in capacity, connectivity for over 1 billion users, strict latency control, and network software programming.
BlueSPACE targets a disruptive yet pragmatic approach for the deployment of scalable, reconfigurable and future proof fronthaul solutions for 5G communications, offering unrivalled characteristics that include:
a) Using optical space division multiplexing (SDM) in the form of multi-core fibre for increased bandwidth provisioning and a future proof infrastructure. Ultimately, SDM can naturally enable spatial diversity in the radio-domain by supporting radio frequency beam steering and -forming in the photonic domain or through massive multiple input multiple output transmission starting/ending in the fibre medium,
b) A compact infrastructure that is reconfigurable by means of software defined networking (SDN) and network function virtualization (NFV) paradigms, and
c) The possibility of providing full integration with other existing approaches for the implementation of access networks, such as passive optical networks (PONs).
The core concept of blueSPACE is to exploit the added value of optical space division multiplexing (SDM) in the radio access network (RAN) with an efficient optical beamforming interface for wireless transmission in the 24.25 GHz to 27.5 GHz millimetre-wave band for 5G new radio (5G NR), as shown in Figure 1.
The overall objective of blueSPACE is to develop a disruptive yet realistic approach for 5G fronthaul, able to address the high capacity and flexibility requirements imposed by advanced 5G services efficiently and in a scalable and future-proof manner.