2g_tems parameters_tems all versions.ppt

7/27/2019 2G_TEMS PARAMETERS_TEMS All versions.ppt

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TEMS PARAMETERS(Speech)


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On completion of the module one should be clear about theparameters required during drive test what does it mean andhow much it is important.

Parameters regarding in windows like :

a) Current Channel

b) Radio parameters

c) Serving + Neighbors

Module Objectives


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Current Channel

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

(e.g. 404), MNC: Mobile NetworkCode 0 99 (e.g. 98) LAC : Location

Area Code 0 -65535 (e.g. 5101) CI:

Cell Identity 0 65535 (e.g. 11001)


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Current Channel

Cell GPRS Support: Tells sector is

having GPRS or not. Values are Yes orNo .

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

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(SCH)

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. Viz. time slot no. of

TRX.


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Current Channel

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 codinglike Speech Full Rate of Half Rate.

Speech Codec: It shows FR for FullRate, HR for Half Rate & EFR for

Enhanced Full Rate. Ciphering Algorithm : It shows ciphering

algorithm used by the system to protectdata for privacy. E.g. Cipher by A5/2.

Sub Channel Number: It is displayed ata time when mobile is on dedicated modeat time of call setup when it is getting

SDCCH at that time it shows whichSDCCH it is getting out of 8 available.E.g. 2.


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Current Channel

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 whichfreq. from given MA list for sector

hopping has to be started. E.g. 0 means

sector will start from first freq. to hop.

MAIO generally stands forTRX in any

particular sector like 0,1,2,..(900) OR

0,1,2,(1800).

Hopping Sequence Number (HSN) :Indicates sequence in which frequencies

are allowed to hop from the MA List. 0-

63. 0 for Cyclic Hopping, 1 63 random

hopping sequences.


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Radio Parameters

RxLev : Receiving level in terms of dBmthat mobile is receiving from the site.Range of -30 dBm to -110dBm.

RxQual : Quality of voice which ismeasured on basis of BER. Range ofRxQual 0 -7.

FER: Frame Erasure Rate it representsthe percentage of frames being droppeddue to high number of non-corrected bit

errors in the frame. It is indication of voicequality in network.

BER Actual : Ratio of the number of biterrors to the total number of bitstransmitted in a given time interval. BERis a measure for the voice quality innetwork.. Depending on BER RxQual ismeasured. E,g, BER 0 to 0.2 %

corresponds to RxQual 0. Max. BERcountable and useful is up to 12.8 % whichcorresponds to RxQual of max. 7.


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Radio Parameters

SQI : SQI is a more sophisticated measure

which is dedicated to reflecting the qualityof 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. For

EFR 30, FR21 & HR17 arerespectively ideal values.

C/I : The carrier-over-interference ratio is

the ratio between the signal strength of the

current serving cell and the signal strength

of undesired (interfering) signal

components. It should be atleast > 9 . 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 viz. 2

dBm less acc. To airtel.


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Radio Parameters

DTX :Discontinuous transmission (DTX)

is a mechanism allowing the radiotransmitter to be switched off during

speech pauses. This feature reduces the

power consumption of the transmitter,

which is important for MSs, and decreases

the overall interference level on the radio

channels affecting the capacity of the

network..

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.


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Radio Parameters

RL Timeout Counter (Cur) : This

parameter define the maximum value ofthe 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 windowshows current settings for the mobile

station, for instance whether handover is

disabled or multiband reporting enabled.


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Serving + Neighbor

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 modeof 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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Example


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Example showing every window

2g_tems parameters_tems all versions.ppt

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