...
Base stations that are connected to a user are included in the “active set” of that user. A base station is initially selected to be in the “active set” based on the strength of its pilot signal versus the interference background. Each base station broadcasts a certain fixed percentage of its maximum power on the pilot channel. The interference background consists of the non-orthogonal energy received on the other channels of the base stations within the active set and the total broadcast power of the base stations that are not in the active set. The BS selection criterion, “pilot Ec/Io” is then defined as
(Eq. 34)
with the following definitions:
...