Richard Rudd was the lead author for a paper on measuring clutter loss and building entry loss. The paper found that models and measurements exist for building entry loss and for loss due to local clutter. However, there appears to be less information on the combined effects of the two mechanisms. The paper reports on[…]
Richard Rudd, along with Maziar Nekovee of the University of Sussex, authored a paper on the propagation of millimetre-wave frequencies in urban clutter. The paper describes path loss measurements carried out at 27 GHz in London and Brighton. The primary purpose of the measurement campaign was to provide empirical support for the development of clutter[…]
Plum Consulting provided support to ComReg on their proposed release of the 410-415.5 / 420-425.5 MHz sub band. In particular Plum considered the potential uses of the spectrum including further spectrum for PMR, PPDR, smart metering, IoT networks and smart grids. The study considered spectrum requirements for the different services and availability of other frequencies.[…]
Despite continuing growth in mobile network coverage, there are many areas where enterprise users suffer from no, or poor, connectivity. Manufacturing, agricultural and transport industries in these regions suffer from their remote locations, and they often find that their ability to benefit from Industry 4.0 – the automation through connected machines – is limited. This[…]
This study for the Office of the Communications Authority (OFCA) provided an independent assessment of the impacts on service quality arising from reassignment of 900 MHz and 1800 MHz spectrum in Hong Kong. The assessment model developed by Plum analysed the network infrastructure requirements of mobile network operators under various market, technology evolution and spectrum[…]
Plum have recently collaborated with Huawei in undertaking a number of studies intended to clarify options for spectrum sharing in C-band. The report linked here addresses issues relating to the co-existence of LTE services and satellite downlinks in the same, or adjacent, spectrum. The report describes realistic field trials which illustrate the potential for geographical[…]
Plum has provided expert technical support to ComReg in relation to the future licensing and use of the 3.6 GHz band (3400 – 3800 MHz) in Ireland, following the expiry of existing rights of use for fixed wireless access local area (FWALA) licences in 2017. This included advising on the appropriate technical and other conditions[…]
Plum was part of a consortium examining all aspects of Public Protection and Disaster Relief (PPDR) systems under European research programme FP7. Plum was involved in the development of the reference usage scenarios with the aim of identifying the typical current and anticipated future operational scenarios faced by PPDR operatives and the related communications needs,[…]
On behalf of a UK telecommunications operator, we made measurements of the attenuation due to the woodland surrounding a satellite Earth station. The measurements, at 3.6 GHz, made use of a specially-developed channel sounder. Measurements were made in both summer and winter, and the results have been incorporated in ITU-R Recommendation P.833.
We undertook a number of modelling studies for Ofcom in 2014-2015, to inform their policy on technical conditions relating to the release of 700 MHz broadcast spectrum for mobile use. The most likely band-plan involved the user equipment (UE) handsets transmitting at frequencies immediately above the remaining broadcast allocation, with base stations assigned spectrum higher[…]