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Call drop reasons in GSM network

By ravinder.529 ·
Hey
can anyone please tell me in detail about the possible reasons for call drop in GSM network.

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Call drop reasons

by alcapaino In reply to Call drop reasons in GSM ...

Call drops in GSM network can be caused by the following:

i) Equipment: GSM radios/Combiners can be a cause of this, solution to this is replacement of the unit. A Mobile Station(phone) can also be a cause.

ii) VSWR (voltage wave standing ratio): VSWR caused by poor connections on feeders, water penetration, fault on antenna etc

iii) Transmission problem: If transmission is not perfect, high B.E.R (Bit error ratio) or other factors causing inaccuracy of transmission.

iv) Interference: when there's frequency interfere (either co-channel or adjacent interference).

v) Hand-over: if hand-over between two sectors is not well defined.

For more issues check me at alcapaino@yahoo.com or +255784670979

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y

by ishu_garg_s In reply to Call drop reasons
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Possible reasons for call drop

by redwan0207046 In reply to Call drop reasons in GSM ...

1. If the netwotk is congested and u are low priority user then ur call might be dropped.

2. The signal level for an ideal call is

Transmit +43db
Receive -60 ~ -80db

Some times while receiving call, suppose due to pathloss or shadowing, if ur receiving signal level is -95db, then ur call will be dropeed.
During the site survey, Site selection is very much important to avoid the effect of path loss and shadowing.

3. Sometimes there are pockets due to inappropiate radio network planning, in those pockets ur call might be dropped.
Appropiate Radio Planning and the adjustment of Antenna's Down Tilt is very much important to resolve this problem.

4. During hanover, if the interferrence from the neighbouring BTS is too high the call might be droped.
Appropiate Radio Planning and the adjustment of Antenna's Down Tilt is very much important to resolve this problem

5. Somtimes SACCH, FACCH signalling channels are not available to provide u a TCH channel.In that case call might be dropped. Repeated SACCH, FACCH can solve this problem.

6. Some times it might happen that you are too far from the center of BTS, that is you are at the cell boundary. At that u might face problem to make a call as the transmitted signal from ur MS will not reach BTS.
High gain antenna's can solve this problem. there are other different techniques to resolve this problem. But all these solutinos varies from vendor to vendor.

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Hints for Drop Calls

by info In reply to Call drop reasons in GSM ...

Some quick hints for <a href="http://cellphonedropcalls.com/">dropped calls</a>

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TCH Drop-Call Drop

by telecomfunda In reply to Call drop reasons in GSM ...

Radio Link Time-Out
Layer 2 Time-Out
MSC Time-Out
Assignment to TCH
More Info at
http://telefunda.blogspot.com/2010/01/dropped-calltch-drop-sdcch-drop.html

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