Steps for DT For My Junior RF Engineer brothers Steps followed to perform Drive Test •Physical Verification •Alarm Checking •Frequency Plan Verification •Hardware Configuration Verification
Steps for DT-1 Physical Verification Physical Verification is carried out by verifying physical parameter of the New Site with the TSSR (Technical Site Survey Report) such as Address, Lat, Long, Building Height, Antenna Height, Antenna Type, Orientation, Tilt. Alarm Verification Alarms are generated mainly due to number of reasons, and these needs to checked before Drive is being carried out for the Site. Alarms are checked from the NOC (Network Operating Centre) and if found needs to be verified before drive being carried out. Frequency Plan Verification Frequency Plan can be verified from the NOC (Network Operating Centre) for BCCH and TCH frequencies being implemented as per the Site Integration Sheet sent to NOC (Network Operating Centre). Hardware Configuration Verification Hardware verification is performed to know the Site type, BTS Type, TRX Configuration, VSWR checking , Power measurement for each TRX.
Steps for DT-2 Following is the procedure and parameters that need to checked while performing Drive Test for a New Site. •CPC (Cell Parameter Check) •MOC (Mobile Originated Calls) •MTC (Mobile Terminated Calls – Prepaid to Postpaid) •SMS (Short Messaging Service) •GPRS •Intra Site Handover •Inter Site Handover •TRX Test •Idle Drive (Normal Drive & Frequency Lock Drive) •Dedicated Drive
Steps for DT-3 CPC (Cell Parameter Check) Given are the parameters that need to be checked while performing CPC. CGI (Cell Global Identity) consists if MCC+NCC+LAC+CI BCCH Frequency BSIC GSM Band
Steps for DT-4
MOC and MTC Given are parameter need to be checked while performing MOC and MTC RX Level (-47 dbm to -110dbm) RX Quality (0 to 7) SQI (20 to 30) DTX HSN (Hopping Sequence Number) (0 to 63) MAIO Hopping Frequency C/ I Ratio (>15 dbm) C/ A Ratio (>12 dbm)
Steps for DT-5
GPRS (General Packet Radio System) This is performed to check whether GPRS is working on the Site. This is done by browsing a web page in browser of the phone. For GPRS to be checked it is necessary to see that the handset is WAP, GPRS enabled.
Steps for DT-6 Intra Site Handover Intra Handover is performed to check whether handover is taking place both ways on the Site. Handover is performed among all the Sectors of the Site.
Inter Site Handover Inter Handover is performed to check whether handover is taking place both ways on the Site with it’s adjacent neighbor. Handover needs to checked mandatorarily
for primary neighbor. Handover is performed with all the defined neighbor's in the integration sheet.
Steps for DT-6
TRX Test TRX Test is done to check whether calls originated are being handled by all the TRX’s. Call made during the process is tracked by the MAIO number displayed on the screen for all the TRX’s. e.g. for Site of configuration 6 TRX per sector the MAIO values for TRX test shall be 0,1,2,3,4. Call can be originated on the BCCH or the TCH frequencies. Hence MAIO values will be reflected only for calls on TCH frequency and not on BCCH frequency.
Steps for DT-7 Idle Drive is performed in two fashion •Normal Drive •Frequency Lock Drive Normal Drive This is done to frame the potential area of the new site planned. It also helps us to get to know the important neighboring sites for which the handover has to take place. Frequency Lock Drive This is done by locking the BCCH frequency of the serving cell and performing the drive for the same cell unless the mobile enters into No Service Mode. This is use-
ful for making decision related to GSM antenna height, tilt, and orientation.
Dedicated Drive Dedicated drive is an important part of Drive Test. Here call is made to a test number and drive is done for the potential areas of the Site. During drive being carried out one has constantly monitor parameters such as RX Level, RX Quality, SQI, DTX, C/I Ratio, Hopping Channel, Neighbor list, TA (Timing Advance). Constant changes in these parameter are helpful for post Optimization of the site.
