Could you explain what is happening when the MS enters the cell in Idle Mode ?
You say there is a loss of signal, resulting in “no network” ?
LU REQ -> LU ACCEPT = 17 seconds
1/ The Loc Upd Req is probably caused by an IMSI ATTACH.
2/ Such a long duration cannot be caused, to my knowlege, by a “Jammer”. So I would investigate a core network problem – but why only this cell would have this problem ???
I’ve no other idea.. a jammer creates interference, so during a call you should see a very bad rxqual.