- This topic has 35 replies, 1 voice, and was last updated 5 years, 2 months ago by Sud.
7th August 2009 at 10:45 #58139Fresh OptGuest
but, if we enable Fast Traffic HO, will that increase incomming HO failure due to congestion on those cells with congestion, hence, bad KPI regarding HO. Am I correct?
Regards,7th August 2009 at 12:29 #58140PixGuest
Yes, if the candidate target is congested, the fast traffic ho will fail due to congestion.
But I must disagree with you : the HO inc fail due to congestion is NOT a KPI !!
HO congestion means the BSC detects a HO, and check for available candidate. If it doesn’t find the candidate is congested, what is actually the impact for the subscriber ? Not being able to setup the call ? So it is as if fast traffic HO is disabled… >> call setup fails.
But sometimes, the BSC finds a candidate with a free TCH >> call setup succeeds.
Altogether, you increaase the probability of call setup success, even though you artificially increse the inc HO congestion.
The KPI for HO is actually “outgoing HO execution success rate”, which doesn’t take into account congestion failures.
pix18th August 2009 at 10:34 #58141RexGuest
What is difference between Directed Retry and Forced Directed Retry (Alcatel). And wich is the order of triggering, directed retry, forced directed retry, fast traffic ho or other way (if we have all features enabled)? Waiting for your response.
Rex18th August 2009 at 12:06 #58142PixGuest
DR = HO from sdcch to tch, detected with a standard HO algorithm (could be poor quality, low level, long distance, power budget, etc)
FDR = ho from sdcch to tch, detected thanks to a specific “capture-style” algorithm:
if DL_RXLEV(n) > L_RXLEV_NCELL_DR(n) and number of free TCH in n > FREELEVEL_DR(n), then the MS is sent to “n”.
The order of detection… DR is actually a mix of different causes, so if DR is detected on Emergency algo, it has high priority. If it is detected with PBGT algo, then it has the same priority as the cause 12.
FDR and fast traffic HO have less priority than cause 12. But the priority is no really important here : DR doesn’t happen much, while FDR and FTH are more easily triggered.
Best regards,27th September 2010 at 11:39 #58143manjunathGuest
Hi i want to know how Directed retry will work in BSC wat is the process5th February 2016 at 09:31 #58144SudGuest
MS, MO, HSN, what is the role in a cell. Plz explain .