- This topic has 5 replies, 1 voice, and was last updated 11 years, 1 month ago by Pix.
7th December 2009 at 13:19 #60036PeterGuest
Hi all, actually we are in B9 ALU BSS and we are facing some high BSC loaded in term of BHCA, are they any recommendation about BHCA load and probably could we face overload?7th December 2009 at 13:29 #60037PixGuest
Could you please tell me which indicator you are looking at ?
Is this a BSS indicator ?
Anyway, if there is traffic overload, then you should either increase capacity of BSC *or* rehome BTS to other BSC.
pix7th December 2009 at 13:36 #60038PeterGuest
the indicator is RTCH_assign_request_BH and the formula is: BHCA Load=RTCH_assign_request_BH (per BSC)/ BSC capacity in term of BHCA
and how to monitor the traffic overload?7th December 2009 at 14:10 #60039PixGuest
Which BSC are you using ? The 9120 BSC “legacy” or the 9130 BSC Evolution (Mx) ?
Your BHCA load is weird…. Why do you divide a number of calls by a capacity (in Erlangs ?)
Can you show me the typical values for this indicator (and the details of the computation)
pix7th December 2009 at 15:38 #60040PeterGuest
We are using both of the ALU BSC with different capacities, and division is maked by number of BHCA MAX carried by the BSC (given by ALU for each type of BSC),
values reached 96% for some BSCs while Traffic Load is still low 70% on the BSC, any explanations?7th December 2009 at 16:23 #60041PixGuest
Well, the BHCA capacity is just computed accordingly to the capacity in erlangs. It depends on the values used in the ALU traffic assumptions.
When you say traffic load, it is :
total of all RTCH_Erlang_total ( TCTRE ) for all cells at the same hour…
divided by Erlang Capacity of the BSC (which is depending on configuration).
The traffic load is certainly a better way to assess the actual load of the BSC.
In B10 and in the BSC evolution only, there is this counter :
MC926 : Each time the CCP reaches the limit defined by the MAX_TCH_PER_CCP parameter.
Otherwise, that’s all I can think of… Do you see high CDR or poor CSSR during the busy hour ?