Pilot Pollution
A condition where a UE receives strong signals from 3+ cells without a clear dominant server, causing interference and degraded performance.
Pilot pollution is what you get when too much coverage becomes a problem. The UE sits somewhere — often an open square, a hilltop, or between high sites — where several cells arrive at similar, strong power with no single one clearly winning. The name comes from 3G, where the "pilot" was the reference channel, but the condition carries straight over to LTE and NR: lots of comparable servers, no dominant one.
The damage is twofold. Every strong neighbour that isn't your serving cell is interference, so SINR craters even though RSRP looks great — the classic "strong signal, terrible data" reading. And the UE keeps ping-ponging between near-equal cells, churning handovers and risking drops. You spot it on a drive test as a patch of high RSRP but low SINR with a busy handover log. Fixes are all about restoring a clear winner: down-tilting or trimming the power of the offending overshooting cells, re-pointing antennas, or sometimes adding a dedicated server for that spot so one cell can dominate.
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