Skip to main content

Posts

Showing posts with the label 2G Drive Test

Factors Affecting Throughput in LTE :-

Factors Affecting Throughput in LTE :- Low mcs, Low sinr, Low rsrq , high prb usage, wrong earfcn Definition, no Carrier aggregation ör missing ca configuration, Pci , Route sequence index collision, Wrong tac planning, gateway security problem, etc. air quality (now sinr, rsrq, etc etc), modulation level. For example, 16QAM, 64QAM, etc. Low Throughput Issue:- 1 - Poor coverage (BLER) 2 - Availability issue 3 - Uplink Interference 4 - A poor RACH decoding SR 5 - High error on S1 link. 6 - Delay on S1 link towards MME & SGW. 7 - Accessibility issue. 8 - Handover failure. 9 - Lack of PRBs. 10 - Problematic UE. 11 - Downlink Interference (Bad CQI) 12 - MIMO Parameters 13 - High VSWR 14 - High radio errors or instability issue. 15 - Maximum number of RRC connections active per cell 16 - Maximum number of users per TTI supported per cell. 17 - Core network, MME/SGW, etc 18 - Transmission instability & bottleneck. 19 - Incorrect parameter setting. 20 - Badly tuned handover parameters...
Post a Comment
Read More>>
Share/Bookmark

Golden Rules for collecting Data during drive test

Golden Rules for collecting Data during drive test: 1-      Choose the site under surveying to be above the clutter and repeat types of the clutter you would be looking at. 2-      Any thing with clutter less than 100 is not enough. 3-      Make sure that the GPS surveying option is the same as the one used where the drive test is being performed. 4-      Make sure that the Dautch value of the GPS is the same as the one set for the country where the drive test is being made. 5-      Better collect data in the format of, Degrees: Decimal Points Degrees. 6-      Every 6 degrees you move result is one point change in the whole picture the UK being the reference point at 30, To the left it increases and to the right it decreases. 7-      Sampling rate, 40 Samples per 40 wavelengths. To reduce the effect of Radio fading. 8-      Sam...
Post a Comment
Read More>>

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.
Post a Comment
Read More>>

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.
Post a Comment
Read More>>

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.
2 comments
Read More>>

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.
Post a Comment
Read More>>

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) Definition of Radio Parameters: • RxLev : Receiving level in terms of dBm that mobile is receiving from the site. Range of -30 dBm to -110dBm. • RxQual : Quality of voice which is measured on basis of BER. Range of RxQual 0 -7. • FER : Frame Erasure Rate it represents the percentage of frames being dropped due to high number of non-corrected bit errors in the frame. It is indication of voice quality in network. • BER Actual : Ratio of the number of bit errors to the total number of bits transmitted in a given time interval. BER is a measure for the voice quality in network.. Depending on BER RxQual is measured. E,g, BER 0 to 0.2 %   corresponds to RxQual 0. Max. BER countable and useful is up to 12.8 % which ...
Post a Comment
Read More>>

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 n Definitions: 1. Time : It is system time of computer. 2. Cell name : It displays the name of the sector which is serving according to the cellfile that is loaded in TEMS. 3. CGI : It stands for the Cell Global Identity which is unique for every sector of the site. It consists of MCC,MNC,LAC,CI. MCC : Mobile Country Code 0 – 999  MNC: Mobile Network Code 0 – 99  LAC : Location Area Code 0 -65535 CI: Cell Identity 0 – 65535  • Cell GPRS Support :  Tells sector is having GPRS or not. Values are  Yes or No . • Band : It tells in which Freq. Band mobile is operating e.g. GSM 900/ 1800. • BCCH ARFCN : It tells by which BCCH is the mobile station getting served. • TCH ARFCN : On which Traffic Freq. call is going on. • BSIC (Base Station Identity Code) : It is combinati...
Post a Comment
Read More>>

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
Post a Comment
Read More>>

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.
Post a Comment
Read More>>

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
Post a Comment
Read More>>

check your skills