Registration and networking
CW welcome and introduction to the Small Cell and Radio Technology SIGs: Simon Mead, CEO, Cambridge Wireless (CW)
Welcome from event host, Dritan Kaleshi, Head of Technology (5G), Digital Catapult
Welcome from Ian Corden, Director, Telecommunications, at event sponsor, Plum Consulting
‘Making spectrum work better for consumers and businesses’: David Harrison, Principal Advisor Digital Media Technology, Ofcom
Spectrum sharing provides opportunities to support innovation in new wireless services and to extend their reach into more places where people and things go. In this talk David will explore how these benefits can be best secured, including the future role of technology.
Q & A
'The U.S. 3.5 GHz Citizens Broadband Radio Service': Andy Clegg, Spectrum Engineering Lead, Google
Initial commercial CBRS deployments have begun in the U.S., and full commercial service will begin later this year. The sharing arrangements in CBRS, involving Spectrum Access Systems (SASs) and Environmental Sensing Capability (ESC) networks, are relatively complex, driven mostly by the dynamic and secret nature of military incumbent activities and the need to compute aggregate interference into incumbents and some CBRS users. This talk will explore a few of the many technical details of the protection framework and how the SAS and ESC systems operate, with the goal of raising awareness for potential application of some of the CBRS concepts in other bands and other regions.
Q & A
'Advancing the Understanding of Sharing in 5G Networks': Dr Tim Forde, Executive Director of CONNECT, Trinity College Dublin
In this talk we describe advances the CONNECT research centre has made in understanding limits of spectrum and infrastructure sharing. We also describe some recent work undertaken in collaboration with industry partners which looks at how we can overcome unforeseen practical limitations of sharing in urban small cell deployments.
Q & A
Refreshments and networking
‘Co-existence in an age of technology neutrality and licence-exemption’: Simon Pike, Independent
Much of modern spectrum management is based on an implicit assumption that the applications that share a particular portion of spectrum will have broadly similar characteristics and deployment. However, the ever-widening range of uses of the radio spectrum means that this is often no longer the case. A similar situation arises when licence-exempt spectrum is used in novel ways. An example of this is the 60GHz band. Does the approach to studying coexistence need to change, or are we heading towards increasing problems of interference between dissimilar applications? I will suggest a possible approach to mitigate this interference, by recommending ‘default’ frequencies to be used by an application in the absence of other users or interference. The ‘default’ frequency would be different for different applications, which would reduce ‘clashes’ between different types of use.
Q & A
‘Signal Processing Techniques for Mitigating Against Non-System Interference’: Stephen Wales, Roke Manor Research
In spectrum sharing applications co-channel interference from a different system could be experienced, and normally co-ordination rules are developed that set interference levels to minimise impact on both systems involved in sharing. These interference levels can be quite restrictive. Interference mitigation techniques can potentially be incorporated into receivers allowing higher levels of interference to be tolerated. This talk examines a number of signal processing techniques designed to mitigate against non-system interference. These techniques exploit differences in signal characteristics between the wanted signal and interference. Examples covered include transform domain excision, signal separation based on statistics, array processing techniques and an approach based on machine learning. Examples of equipment incorporating some of the techniques described are given.
Q & A
Lunch and networking
‘Flexible RF technologies for Spectrum Sharing’: Mark Beach, Professor of Radio Systems Engineering, University of Bristol (Communications Systems & Networks Research Group)
Increasingly, networks are moving to being software defined, making them highly flexible and independent of their transmission and computing substrate. However, this is not true for the radio interface: current systems are inflexible and unable to easily adapt to new standards, spectrum and the efficient support of Dynamic Spectrum Access. In this presentation, the latest laboratory results from Bristol’s research in flexible duplexing, robust receiver architectures and efficient and agile transmitter technologies will be summarised in the context of spectrum sharing.
Q & A
‘RF Hardware Challenges in Cognitive Radios’: Martin Gostling, Managing Director, Radio Design
State of the art cellular radios contain fixed frequency components – for example filters – that pose a significant challenge to the cognitive radio concept due to their lack of adaptability. This talk analyses some of these problems and presents potential solutions.
Q & A
‘Massive MIMO and centralised RANs for spectrum sharing’: Ian Corden, Director, Telecommunications, Plum Consulting
Massive MIMO has been widely cited as a key technology with 5G mobile solutions and continues to be an active area in both research and product development domains, with promise of significant capacity and coverage extensions over SISO and low order MIMO systems. However, in mobile environments with highly variable and dynamic radio scattering conditions, the channel estimation problem is non-trivial, yielding degradation of performance in practical situations over theoretical estimates and lab results. Further, high order MIMO designs require high bandwidth backhaul connections. In parallel, RAN architectures are being reconsidered. With new open access protocols such as eCPRI, radio antenna arrays can be separated from baseband processing hubs and control plane systems using ethernet over fibre links, enabling centralised architectures which can support diverse MIMO and beamforming. This talk will review the current state of massive MIMO in mobile systems, the potential for MIMO evolution with centralised RANs, the potential for these technologies to support spectrum sharing, and the potential system and industry advantages.
Q & A
End of session followed by networking and refreshments