Below is from a book "TD-SCDMA Techonlogy" :
In order to mitigate the effect of interference and improve the coverage at the cellís edge, conventional CDMA 3G systems have to use the so-called soft handover when an ongoing call needs to be transferred from one cell to another as a user moves the through the coverage area.
Why use "the" before "through the coverage area"?
Can I say "....moves through the coverage area..."?
No, the "the" is a mistake. It doesn't belong there.