i’m glad to give you new perspectives, but be careful because in your post there are *a lot* of misunderstandings !
let’s be clear:
cause –> consequence
PCH congestion –> paging retransmission
SDCCH congestion –> no paging retransmission, but call establishment failure (the subscriber has to dial again !)
TCH congestion –> no paging retransmission, but call establishment failure (the subscriber has to dial again)
As you can see, SDCCH and TCH congestions have the same consequences. However, a cell with sdcch congestion does not mean there is no TCH anymore. The congestion of SDCCH and TCH are totally uncorrelated !
It is actually recommended to avoid sdcch congestion more than tch congestion. SDCCH is really important, and there is almost no queuing. Whereas TCH allocation can use a more elaborate queuing system, to avoid congestion.
I hope I was clear… 🙂