Drive-Test Basic Radio Parameter

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  Very Good
-65 to -75 Good

-75 to -95 Fair

-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

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 current serving cell to that of

the signal strength of adjacent frequency

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.

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