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Call drops in GSM

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LEMAURE - 16th April 2017  (09:27 GMT)

Hello Mohamed!

make sure the Radio Link Timer related to AMR is greater than these of non AMR calls. adjust the following parameters
AFR SACCH Multi-Frames ==>48
AHR SACCH Multi-Frames ==>32

Wallis Dudhnath - 7th April 2017  (02:11 GMT)

For your case a RCA is required.

Factors that influence call drops include but is not limited to
the following; Transmission issues (high Bit Error Rates), Handover between
sites that have not been optimised and Co-Channel interference.

Check if your BTS has any obvious harware faults that require a correction (e.g.
latest fix / correction Package).

mohamed - 6th April 2017  (16:00 GMT)

Can anybody tell,is there any relation between AMR and Call drops. During drive in some of the scenario i am getting HO Fail/Call drops due to AMR.

pix - 26th March 2012  (11:43 GMT)

no sorry, i don't know the huawei bts...


Ganesh - 24th March 2012  (16:28 GMT)

Mr Pix can you tell me how many card used in Huwei BTS

RF Engineer - 24th March 2011  (13:12 GMT)

Can anybody tell,is there any relation between AMR and Call drops. During drive in some of the scenario i am getting HO Fail/Call drops due to AMR.

I want to know how does AMR works?
What is the value of AMR in good and bad conditions.

Kindly help me!!

RF Engineer - 24th March 2011  (05:33 GMT)

Thanks Mr.Pix.

pix - 21st March 2011  (08:44 GMT)

rf egineer,

i can't tell you were are AMR and RSACCH parameters in Huawei : i don't know this system.

RSACCH does not increase the load of the system, nowhere ! Instead of sending one new SACCH message every 480ms, there is one new SACCH msg every 2*480ms ! In the meanwhile, the same message is sent two times (at t=0 and at t=480ms).

So there is the same amount of SACCH load, with twice less information, each ifo being sent twice.

Enable Repeated FACCH as well, RSACCH and RFACCH are two features that works well together.

RSACCH is only useful when AMR is enabled and you are using "low" codecs. With regular EFR codec, there will be no improvement.

RF Engineer - 21st March 2011  (05:40 GMT)

Hi Pix,


I am using huawei system. i was searching those parameter,but i did not found that. Can you please help me to get this in which parameter group?.

I have a doubt,If we increase the repeated SACCH frames,is there any congestion in the network?

Kindly guide me..

pix - 17th March 2011  (19:39 GMT)

hi rf engineer,

the only soft solution I know is to use a stronger codec : have you tried AMR-FR with a codec around 6 or 7 kb/s ?
This should be more resistant in poor radio conditions. You will need to increase the radio link timeout 'amr' to fully benefit from it. (in most recent radio releases, there is a new feature "repeated SACCH", that is useful for robustness of AMR against call drop)

Physical solution : add a cheap indoor repeater for this user, this will cost few hundred $.
1 outdoor antenna
2 feeders 1/2"
1 repeater (2-ways amplifier)
1 indoor antenna

It's an easy upgrade as long as there are not too many frequencies to repeat. If the GSM band is very used, then you'll have to invest in a band-selective or even channel selective repeater (more $$).


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