- This topic has 26 replies, 1 voice, and was last updated 10 years, 6 months ago by ravishanker.
1st November 2006 at 09:29 #46040JohnGuest
For the mean holding time that we use in the Erlang Equation, E.g. If the BHCA = 60,000, Total Call duration in the network per hour = 6,000,000 seconds, the BHCC = 30,000.
What is the mean call holding time that we should take in the Erlang equation?
6,000,000 / 60,000 = 100s MHT or
6,000,000 / 30,000 = 200s MHT1st November 2006 at 18:13 #46041PixGuest
BHCC and BHCA… can you give us the definition of those indicators ? each vendor uses different names and i’m not used to those ones.1st November 2006 at 18:25 #46042PixGuest
ok, it’s busy hour call completions and attempts.
i would use the BHCC, to know the duration of a call, at a network level. at the cell level, the calculation should include the attempts minus the outgoing handovers..
however, don’t you find it scary you’re having 50% of the attempts that don’t “complete” … i hope it is just an example 🙂 normally, those two values shouldn’t be too far apart (call success rate should be at least 96%, in an average network).17th July 2007 at 15:52 #46043prakashGuest
if I have a network to dimension which has 2000Er at 1% GoS per module, 35mE/sub, BHCA/sub of 2.0, what would be the maximum BHCA the switch can generate ?18th July 2007 at 06:49 #46044RizviGuest
if I have a network to dimension which has 2000Er at 1% GoS per module, 35mE/sub, BHCA/sub of 2.0, what would be the maximum BHCA the switch can generate ?
the approximate subscriber is 2000*1000/35=572K.
Hence calculated BHCA is 572000*2=1144000 or 1144K. Infact, in practical cases the aforementioned BHCA will be different since subscriber is consist of prepaid and post paid subscribers. In this case BHCA will minimum 1.3 times of 1144K ie. 1500K.
thats all………what i understood.18th July 2007 at 09:58 #46045prakashGuest
good morning Rizvi
thanks for your help.In your calculation, may I know what the 1000 represents ?
I picked the parameters from a working switch and the BHCA given was 500K/module at 30,000subs.19th July 2007 at 05:40 #46046RizviGuest
Good Morning Prakash u too,
Basically the parameter u provided in earlier 35 mErl. to find the subscribers, we need to consider Erl. Hence convert from mErl to Erl, the 1000 is multiplied.
Another can u provide little described where u work and which vendor equipment u handling.
thanks a lot.
with best regards,
Rivi14th September 2007 at 05:38 #46047ParveenGuest
Whats the formulla for MHT14th September 2007 at 06:18 #46048BilalGuest
MHT = 3600 * Carried Traffic(Erlang)/Number of established connections26th September 2007 at 12:33 #46049samGuest
what is the definition of MHT
is it mean holding time of circuit seizure OR mean holding time of call establishment (befor call connexion)27th September 2007 at 04:16 #46050asoGuest
there is difference that there are two holding time
1- channel holding time.
2- call holding time
and the difference is channel holding time is less than call holding time there fore the first one is for call establish an latter is for continuity for the call with the performing for Handover.
thanks3rd October 2007 at 11:19 #46051MHT !!!Guest
Thanks a lot ASO for your valuable reply.
but i meant the MHT of core network part (not radio part)
i.e the mean holding time of links wich are between nodes (MSCs).
is it the whole call duration with call time establishement included ?16th May 2008 at 16:03 #46052sniperGuest
hi everybody now i discover this forum it’s fun
i hav a question concerning the MHT, what is the cause of MHT in the operator netwok?
is it the same cause or it differ in function of the duration of MHT?
do you think that MHT is a significative indicator in a operator network19th May 2008 at 18:58 #46053pixGuest
mht is not a problem : it is the average call duration. typical values range from 40s to 120s, and it just reflects the subscriber behaviour.
if it’s between those values, then it’s fine.
if MHT = 5s, then you either have a lot of handovers (too much, actually) or a hardware problem : the TRX is shutting down the call after few seconds.16th June 2008 at 11:17 #46054AliGuest
For MSC the MHT is
3600*(avg(amount of traffic calls)/100)/sum(total ok calls)
it is in seconds