- This topic has 8 replies, 1 voice, and was last updated 14 years, 5 months ago by pix.
29th February 2008 at 08:04 #51251ToofyGuest
I observed by RNO the MHT on interface A(A_Duration_Avg) and MHT on Air interface(RTCH_Duration_Avg), I saw that the MHT on interface A is significatively greater than on the interface Air.
I have no explanation why these values are not equal or with a slight delta in part because of the congestion on the A interface there are no other factors that explain a difference so greater.
Does someone has worked on it or have an explanation?29th February 2008 at 10:11 #51252PixGuest
Can you give an example of the values you find for interface Air and interface A ?
Thank you 🙂
Pix1st March 2008 at 12:51 #51253PanGuest
QUEUE??? OACSU??? Have you a one of this features (or both) in your network?2nd March 2008 at 07:36 #51254BilalGuest
Can intra-cell handovers cause this? Every intra-cell handover causes a new TCH allocation without new A interface allocation. This can result in lower values of TCH MHT.2nd March 2008 at 10:01 #51255PixGuest
I don’t think so, the MHT should take this in account. But I’ll check it out tomorrow.3rd March 2008 at 08:17 #51256toofyGuest
Pan, this Two features are not implemented.
I think that the Hand Over Intra/Inter Cell are the cause of this problem because it cause a number of allocation too bigger but in A interface there’s no new allocations.
what do you think?3rd March 2008 at 16:01 #51257PixGuest
I was wrong : Intracell HO can cause a lower value of Mean Holding Time.
(A TCH is seized whenever a 48.058CHANNEL_ACTIVATION message is about to be sent to the cell to activate a full rate TCH channel for normal assignment or handover.)4th March 2008 at 12:36 #51258BilalGuest
Following formula can be used to calculate Call Mean Holding Time(seconds):
3600*TCH Traffic/No. of Assignment Complete Messages
TCASSALL is the Ericsson’s counter for No. of Assignment Complete Messages4th March 2008 at 13:47 #51259pixGuest
that’s good.. in alcatel, there are actually :
– TCH duration avg (cumulated TCH busy time / nb of assignment complete, incl. intra HO, inc HO, TCH normal assignment)
– Call duration average ( RTCH_duration_avg * (1 + RTCH_HO_per_Call))
There is no “mean holding time” per say.