UMTS Low CS/PS IRAT Handover Success Rate Analysis

Analysis of low CS/PS IRAT HOSR can be done using the below mentioned procedure:

1. Neighbor Audit - removal of illogical neighbors is equally important as adding Tier 1 cells
2. External neighbors configuration check - Often times, BCCH/NCC/BCC is modified and should be updated in external cells on the UMTS end
3. Parameter check
4. GSM State mode - can be modified in case of severe handover failures on one relation 

Apart from these steps, it should be checked whether the IRAT HOSR is low for both CS and PS or just one of these. If it is low for only one of the services, compressed mode parameters can be tuned to trigger early handover when the signal strength is high. Analysis should be followed from cluster to cell to relation level to pinpoint the issue.

Base Station Solution

Base station solution can be classified into two types:

Macro: where BBU and RFU are part of the cabinet of the base station
Distributed: where the cabinet comprises of BBU and RRU. RRU can be deployed close to the antenna which reduces antenna loss and can contribute to enhanced coverage.

RRU can be singe mode or multimode (GSM, UMTS, and/or LTE). A typical RRU contains sub systems such as Transciever (TRX), Power Amplifier (PA)/LNA, and Duplexer (DFL).