How to analyse sdcch drop due to
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This document discusses possible reasons for SDCCH drops due to "Other Reasons" and provides steps to analyze and address the issue. It lists hardware faults, parameter definition issues, DIP status problems, frequency interference, C7 link stability, and improper MSC parameter definition as potential causes. The document advises checking logs, parameters, DIP quality, interference levels, C7 link commands, and MSC settings related to call setup, paging, location updating, authentication, ciphering, and SMS when analyzing SDCCH drops.
How to analyse sdcch drop due to
- 1. How to Analyse SDCCH drop due to "Other Reason" SDCCH drop SOLUTION: CONDITIONS: PROCEDURE: Our experience says that the "Other Reasons" is the area which is Really difficult to point out as there could be various possibilities of the same. There is list of some possibilities that has to be taken care while analysing the SDCCH drop: 1.Hardware Fault at BTS For BTS, HW fault should be the prime and preliminary point to be concentrated. This can be seen by collecting The OMT Logs of CF,TRX, ECU etc. This type of fault could also be intermittent in nature. 2.Definition of Parameter Wrong definition or parameter in the BSC could lead to this type of fault. Few important ones are as follows The MS power control and BTS power control : As the MS and BTS powers Are regulated in order to decrease battery consumption of the MS and not to saturate the multicoupler of the BTS as well as decreasing the Interference in the system. So the fine tuning of the control parameters are very important in accordance with R&D recommendation.
- 2. Activation of Adaptive configuration : This could also be the reason For the SDCCH drop. So proper R&D consultation is needed before activating the same, if required . It is advisable to use of this only in those cells which are really needing the same not the entire BSC area. 3.DIP Status DIP with poor quality may lead to drop call problem in different cells. Poor quality may implicate High BER or Frame Loss in the DIP connected to a site. DIP Quality Supervision tools should be initiated for the suspected connecting Digital Path. Mismatch of DIP could be another reason behind drop call occurrence in some of the cell. 4.frequency Interference Problem Interference is generally related with Quality Drop, but sometimes it May provoke Sudden Drop as per situation. 5.C7 link The C7 link between BSC to MSC should be properly dimensioned and check The command C7ERP for SCCP information. Stability of C7 link 6.Proper definition of MSC parameter The main functions of SDCCH are as follows : -Call Setup -Paging
- 3. -Location Updating -Authentication -Ciphering -SMS -IMEI Check As we could see above, the MSC is also very well involved in above functions so it is equally required to check MSC part also while analyzing the SDCCH drop. Few important parameters definition are given below : 1.The Exchange properties IMEICONTROLSMS and IMEICONTROLSS to "0" (No IMEI related checks ON if you don't have a EIR), 2 PHASE2-1 in the BSC parameters in MSC (MGBSP). Same as above, we may also check the parameter related to Location updating, SMS, ciphering , authentication etc.