What are the possible causes for a Drop Call on a UMTS network?

There are several reasons for RAB Drop in WCDMA network.

·         Poor Coverage (DL / UL)

·         Pilot Pollution / Pilot Spillover

·         Missing Neighbor

·         SC Collisions

·         Delayed Handovers

·         No resource availability (Congestion) for Hand in

·         Loss of Synchronization

·         Fast Fading

·         Delayed IRAT Triggers

·         Hardware Issues

·         External Interference

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What are the possible causes for a lower PSR?

There are several different reason for low Paging Success Ratio

- Non-continuous RF Coverage – UE going in and out of coverage area frequently
- Very High ‘Periodic Location Update Timer’ – Keeping UEs in VLR long time after it moved out of coverage
- Lower Paging Channel Power
- Access Channel Parameter Issues
- Delayed Location Update when crossing the LA / CN Boundaries

Also Check

E Book on GPRS and EDGE Performance

What is G-RAKE Receiver?