Support on 400 MHz spectrum

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.[…]

Plum Insight: Maximising spectrum efficiency with private LTE

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[…]

Reassignment of 900 MHz and 1800 MHz in Hong Kong

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[…]

The compatibility of LTE services and VSAT receivers

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[…]

PPDR transformation centre

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,[…]

Measurement of vegetation loss at 3.6 GHz

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.

700 MHz modelling

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[…]