[tarun]

what is GOS means

[Gerald]

How can i calculate my SDCCH accessibility. Please if i have a low SDCCH accessiblity rate will it affect my call drop rate

[Barrie]

Please can anyone tell the key parameters to consider in calculating the trunk usage for Ericcson BSC

[Ayat]

hello

what is GOS means?
Gos grade of service (blocking)

in radio part we design the network forcertian Gos , for example Gos in 2%, by erlang table B, there is a relation between number of channel , blocking rate ,and traffic.

so according to number of channel and Gos we can know the desgin traffic.

[nitin]

hello all,
can anybody tell me how can we define possible trx configuration for a specific alloted frequency spectrum?
eg:if a service provider is allocated with 4.4mhz frequency band,then what is the possible trx config. for this.

[vipul]

can anybody tell me the meaning of the alarm ” mean holding time below thresold” in Nokia system?

[Majid]

Hi all,

in Huawei BSC32 there is what’s called TCH congestion Rate (TCH Overflow) (%) i didn’t find the formula behind it but i found the one for SDCCH congestion Rate (SDCCH overflow) (%), which is
(Attempted SDCCH seizures meeting an sdcch blocked state/attempted sdcch seizures all), so it looks similar.
So i get for tch cogestion overflow for one cell 40%
and tch congestion 3% so why this big difference do you think.

[Ayat]

Hello,

Dear , Majid becuase as you know SDCCH is a control channel the user and network use this channl for many thing

location upadte , IMSI deatach,
recall estiblshed ,, sms ,,so try to check the defination of this KPI,attempted sdcch seizures all

which services are include in this counter , you have to know the traffic from whaere

also check your resourcse .

[Gerald]

SDCCH SDCCH SDCCH SDCCH
ASSIGN SEIZURE ASSIGN ACCESS
SUCCESS ATTEMPT FAILED

1470 3375 1905 43.56%
261 486 225 53.70%
768 1302 534 58.99%
163 255 92 63.92%

Please these are sites with worst SDCCH accessibility. Can someone help me with reason for such accessibility.

[nitin]

Hello all,

can anybody explain me the MAIO plan with a suitable eg.???????

[uLVa]

haii…
can i ask u??

formula for

1 TCH Call Blocked
2 TCH Assign Success Rate
3 Call Success Rate
4 Drop Call Rate
5 SDCCH Call Blocked
6 SDCCH Assign Success Rate
$7 Handover Success Rate
8 Handover Failure Rate

please help me,,
coz i need that for my thesis

[Mak]

1 TCH Call Blocked
2 TCH Assign Success Rate
3 Call Success Rate
4 Drop Call Rate
5 SDCCH Call Blocked
6 SDCCH Assign Success Rate
$7 Handover Success Rate
8 Handover Failure Rate

These all formula varies vendor to vendor

[Ayat]

Hello uLVa

these formulas depends on vendor

TCH Call Blocked =

some vendor call this KPI TCH congestion rate (%) = TCH overflow*100/TCH attempts

2 TCH Assign Success Rate

= TCH assign request /tch attempts

3 Call Success Rate
100-TCH assign failure

0r TCH seizure succ attepts/TCH attempts

4 Drop Call Rate

Most of vendors have two call drop

SDCCH and TCH

TCH call drop rate (%)
TCH call drop /TCH sizure attemots

also for SDCCH

5 SDCCH Call Blocked
SDCCH congestion

6 SDCCH Assign Success Rate

$7 Handover Success Rate
handover request/handover attepts
depends on Handover type

8 Handover Failure Rate

by small search in google you will get alot paper about this topic

good luck

[nitin]

Hello all,

Can anybody tel me how can we convert erlang into kbps???is there any formula….

[Ayat]

hello

check this formula

Traffic Volume for CS Domain_AMR(Kbyte)= Traffic Volume for CS Domain_AMR(Erl)×12.2×3600/8

it deponds on the traffic type

if we work with video trafic we will take in our consideration 64Kbps instead of 12.2

i am not sure .

but we create these formula by logic

thanks

[Author]

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