Drive Test Ppt

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RADIO PARAMETERS

Rxlev - Avg received signal strength of the serving cell measured on all time slot and subset of time slots. Rxlev (Full) – Rxlev of a full rate traffic channel Rxlev(Sub)- If DTX-DL is used in the network the “SUB” set is used. -10 to -65 INDOOR -65 to -75 INCAR -75 to -95 OUTDOOR -95 TO -105 WORST Rxqual - Avg received signal quality of the serving cell measured on all time slot and subset of time slots. It is measured on basis of BER. For call w/o hopping Rxqual should be less than 4 And for call with hopping it should be less than 5

Suman Mondal; RF Engineer; ADA Cellworks Mobile:09732204524; Email: [email protected] ,


FER : The percentage of frames being dropped due to high number of non corrected bit errors in the frame. It is the ratio of discarded speech frames to that of received speech frames. It should be 0. 0 TO 4% GOOD 4 TO 15 % DEGRADED 15 % < USELESS 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. SQI : SQI is a more sophisticated measure which is dedicated to reflecting the quality of the speech (as opposed to radio environment conditions). This means that when optimizing the speech quality in your network, SQI is the best criterion to use. SQI is updated at 0.5 s intervals. It is computed on basis of BER and FER. 18 to 30 – Good 0 to 18 - Bad C/I : The carrier-over-interference ratio is the ratio between the level of the signal strength of the current serving cell to that of the signal strength of undesired (interfering) signal components. It is updated twice after every sec and is measured when freq. hopping is enabled. 25 to 15 Good 15 to 9 so so C/A : It is the ratio between the level of the signal strength of the the signal strength of adjacent frequency

current serving cell to that of

MS Power Control Level : Displays range of power control from 0 to 8 depending upon network design. E.g. 0 means no power control and 1 means level that is defined by operator DTX : It is based on detecting voice activity and switching on the transmitter only during period when there is active speech to be transmitted .And switching off transmitter during silent period reducing interference TA : Value that the base station calculates from access bursts and sends to the mobile station (MS) enabling the MS to advance the timing of its transmissions to the BS so as to compensate for propagation delay. Value of 0 means MS in radius of 550mt. From BS. RL Timeout Counter (Cur) : This parameter define the maximum value of the radio link counter expressed in SACCH blocks. Range of 4 – 64 in step size of 4. it shows current value of RLT. Decrease by 1 but increase by 2. When it reaches zero it results in normal DROP Call.



RL Timeout Counter (MAX) : This parameter define the maximum value of the radio link counter expressed in SACCH blocks. Range of 4 – 64 in step size of 4. it shows current value of RLT. Normally 16, 20, 24. MS Behavior Modified : This window shows current settings for the mobile station, for instance whether handover is disabled or multiband reporting enabled. CURRENT CHANNEL

When hopping is activated Time: It is system time of computer. Cell name: It displays the name of the sector which is serving according to the cellfile that is loaded in TEMS . CGI : It stands for the Cell Global Identity which is unique for every sector of the site. It consists of MCC,MNC,LAC,CI. Mobile Country Code + Mobile Network Code + Location Area Code +Cell Identity Cell GPRS Support: Tells sector is having GPRS or not. (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 It is combination of Network Color Code (NCC) (0 – 7) & Base Station Color Code (BCC) (0 – 7). e.g. 62. It is decoded by mobile on every Sync. Channel Message. Suman Mondal; RF Engineer; ADA Cellworks Mobile:09732204524; Email: [email protected] ,


Mode: It is shows in which state is mobile operating, Idle, Dedicated & Packet. Time slot: On which time slot of current TCH call is going on. (time slot no. of TRX.) Channel Type: Type of channel mobile is getting now. Like BCCH / SDCCH/8 + SACCH/C8 or CBCH / TCH/F +FACCH/F +SACCH/F. Channel Mode : Shows mode of coding like Speech Full Rate of Half Rate.(speech full rate or half rate version 3) Speech Codec: It shows FR for Full Rate, HR for Half Rate & EFR for Enhanced Full Rate. (AMR Full rate) Ciphering Algorithm : It shows ciphering algorithm used by the system to protect data for privacy. E.g. Cipher by A5/2. , Cipher with algorithm A5/1. Sub Channel Number: It is displayed at a time when mobile is on dedicated mode at time of call setup when it is getting SDCCH at that time it shows which SDCCH it is getting out of 8 available. E.g. 2. Hopping Channel : It shows that current sector is having hopping feature or not. Values are Yes or No. Hopping Frequencies : It displays no. of freq. on which mobile is allowed to hop. viz. MA List for hopping of that sector. Mobile Allocation Index Offset (MAIO): It is the number which tells from which freq. from given MA list for sector hopping has to be started. E.g. 0 means sector will start from first freq. to hop. Hopping Sequence Number (HSN) Indicates the sequence in which the frequencies from the MA List are allowed to hop.(0- 63). 0 for Cyclic Hopping, 1 – 63 for random hopping



When hopping is not activated

For idle mode



Cell Name : Name that describes the neighboring cell as per the cellfile. ARFCN : Channel number mobile receives as neighbor. BSIC: BSIC of the neighboring cell. RxLev : Receiving Level in dBm of neighboring cell. C1 & C2 : These are the cell path loss criterion and cell reselection criteria. Valid during idle mode of mobile station. C31 & C32 : GPRS signal strength threshold criterion C31 and GPRS cell ranking criterion C32. Valid both in packet idle and packet dedicated mode.


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