At the last two Technical Sub Group meetings the issue of guard band requirements has been discussed at some length. The group has examined the associated issues and has concluded that generally this policy is sound subject to further work on detail needed to ensure that the obligation on operators to co-operate is clear and accountable.
Different studies conclude differently on the required guard band size.
Studies recognise that even two equivalent channel widths is not sufficient offer complete adjacent channel protection. These studies have also shown that deployment scenarios significantly impact the guard band requirements. Guard bands of two equivalent channel widths represent a significant proportion of the spectrum available for BFWA in the 28GHz band. The RA wishes to maximise the spectrum available and used for BFWA services. However there remain some drawbacks to this approach.