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[…]

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[…]

Measuring interference to DTT at 800 MHz

We have provided specialist technical advice to ‘Digital Mobile Spectrum Limited’, the UK body charged with managing issues of LTE to DTT interference at 800 MHz LTE. This work has involved a number of strands including;  the development of algorithms and computer models for the site-specific prediction of interference from mobile base stations to domestic DTT receivers;[…]

Plum Aegis Merger

Plum Consulting London LLP and Aegis Systems Limited announced today that they have entered into an agreement under which the business operations of Aegis Systems will become part of Plum. Plum is a leading provider of strategy, policy and regulatory advice on telecommunications, spectrum, online and media issues. Aegis Systems is a preeminent independent provider[…]

DTT signal strength variability measurements

The aim of the study was to gain a better understanding of radio signal variability in different clutter types in order to aid the modelling of potential coexistence issues with DTT using the UK DTT planning model.   Using our survey vehicle extensive measurements at different antenna heights and locations were carried out to gain detailed understanding[…]

Impact of building materials on radio waves

There is an increasing expectation that wireless services should be ubiquitously available, with seamless connectivity whether the user is indoors or outdoors.  It is therefore important that the impact of buildings on the propagation of radiowaves be understood and reliably characterised.  Although many measurements have been made over the decades, it is not always easy[…]

Breathing apparatus telemetry interference

The study estimated the risk of interference into breathing apparatus telemetry systems operating at 862.9625 MHz used by the Fire and Rescue Services (FRS) in the UK.  The work undertaken fell into two parts; in the first part laboratory testing of breathing apparatus telemetry systems was undertaken to establish relevant interference limits while the second[…]

Advice on TV broadcast standards in Singapore

Plum and Aegis advised the Media Development Authority of Singapore on the development of a Code of Practice for TV broadcast standards. The study included a review of international standards and regulations for broadcast TV services across different distribution mechanisms including terrestrial broadcasting, cable, IPTV and over-the-top (OTT). A consultation with stakeholders was also conducted.[…]

Survey of cognitive radio developments

The study undertaken with consulting firm RTT reviewed the standardisation activities for cognitive radio.  The activities of ETSI, IEEE, IETF and ECMA were examined in detail.  As part of the study the key barriers and enablers of the adoption of cognitive radio were identified as shown in the figure below. The study also explored various[…]