- This topic has 1 reply, 1 voice, and was last updated 15 years, 5 months ago by
.
Viewing 2 posts - 1 through 2 (of 2 total)
-
Posts
-
If only 1 BCCH TRX is working in one cell i.e. it is having only 7TCH Timeslot. Practically it should carry 7 Erlangs but we are offering according erlangB table 2.27erlang. So why it shows congestion when it carries 3Erlang though practically it should carry 7 Erlg??????????????????????????????
Because 3 erlangs means that in average 3 TS are busy. But due to random arrival of calls in the cell, 3 erlangs means actually more than 2% of calls are rejected.
7 erlangs means a pure perfect allocation of TCH, but people are not perfect. They might call at the same time, and not wait that someone else free the TCH.This is Erlang B law… statistical occupancy…
Viewing 2 posts - 1 through 2 (of 2 total)
- The forum ‘Telecom Design’ is closed to new topics and replies.
