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 and Aegis advised the IDA on technical, pricing and other assignment approaches for addressing congestion issues in the 400 MHz and 800 MHz bands used to deploy trunked radio systems (TRS) and private mobile radio (PMR) networks in Singapore. The study examined the likely development of standards and availability of equipment for PMR and[…]
A number of sharing studies were undertaken to identify the potential to allocate 5855–5875 MHz for Broadband Direct-Air-to-Ground Communications (DA2GC). One of the studies investigated adjacent band operation to radiolocation operating in the band 5250–5850 MHz. The main radiolocation use is military and the analysis concentrated on fixed land-based, ship borne and transportable platforms operating[…]
MOD had been considering the implications of clearing spectrum for release in the 2.3 GHz bands. This involved not only re-planning the frequency use of existing and future MOD systems but also consideration of the potential for interference to and from these systems with respect to anticipated use of the released spectrum, namely LTE. These studies provided[…]
This study considered the feasibility of co-channel co-existence between IMT and DTT systems operating in the 470 – 694/698 MHz band. The study focussed on the impact of interference from IMT into DTT systems. Due to relatively high antenna gains, EIRP values and fixed antenna masts positioned above the clutter, the protection of DTT receivers[…]
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[…]
Undertook a number of interference studies to examine the potential of releasing the 1.4 GHz band for mobile as part of the preparations for WRC-15. This included development of co-channel and adjacent band interference scenarios to examine the impact of IMT emissions on radar receivers operating in 1300-1400 MHz band; investigation into the potential for co-channel[…]
The study identified key mechanisms resulting in unintended roaming of mobile devices to nearby neighbouring country cellular networks and proposed potential solutions in-line with international practices based on benchmarking. These solutions included potential mitigation measures as well as the outline of possible approaches to address poor signal coverage at coastal areas and within buildings, especially high[…]
The study identified technical constraints that would apply if LTE, HSPA+ and GSM‑R base stations were operating in adjacent spectrum in the 800 MHz band. As part of the study the key interference (sharing) mechanisms were identified as shown in red below: The co-existence analysis was based on the calculation of the effective interfering emission power[…]