tems parameters1

7/28/2019 Tems Parameters1

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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 Channelb) Radio parametersc) 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 accordingto the cellfile that is loaded in TEMS.

3. CGI : It stands for the Cell GlobalIdentity which is unique for everysector of the site. It consists of MCC,MNC,LAC,CI.MCC: Mobile Country Code 0 999

(e.g. 404), MNC: Mobile Network Code 0 99 (e.g. 98) LAC : LocationArea 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 or No .

Band : It tells in which Freq. Band mobileis operating e.g. GSM 900/ 1800.

BCCH ARFCN : It tells by which BCCHis the mobile station getting served.

TCH ARFCN : On which Traffic Freq.call is going on.

BSIC (Base Station Identity Code) : It iscombination of Network Color Code(NCC) (0 7) & Base Station Color Code(BCC) (0 7). e.g. 62. It is decoded bymobile on every Sync. Channel Message.

Mode : It is shows in which state is mobileoperating, Idle, Dedicated & Packet.

Time slot : On which time slot of currentTCH 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 Full Rate,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 meanssector will start from first freq. to hop.

Hopping Sequence Number (HSN) :Indicates sequence in which frequenciesare allowed to hop from the MA List. 0-63. 0 for Cyclic Hopping, 1 63 randomhopping sequences.


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Intentionally Blank


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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 of RxQual 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 bit

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

corresponds to RxQual 0. Max. BER countable 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 radioenvironment conditions). This means thatwhen optimizing the speech quality inyour network, SQI is the best criterion touse. SQI is updated at 0.5 s intervals. It iscomputed on basis of BER and FER. For EFR 30, FR 21 & HR 17 arerespectively ideal values.

C/I : The carrier-over-interference ratio isthe ratio between the signal strength of thecurrent serving cell and the signal strengthof undesired (interfering) signal

components. It should be atleast > 9 . MS Power Control Level : Displays

range of power control from 0 to 8depending upon network design. E.g. 0means no power control and 1 meanslevel that is defined by operator viz. 2dBm less acc. To airtel.


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Radio Parameters

DTX : Discontinuous transmission (DTX)

is a mechanism allowing the radiotransmitter to be switched off duringspeech pauses. This feature reduces the

power consumption of the transmitter,which is important for MSs, and decreasesthe overall interference level on the radiochannels affecting the capacity of thenetwork..

TA : Value that the base station calculatesfrom access bursts and sends to the mobilestation (MS) enabling the MS to advancethe timing of its transmissions to the BS soas 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 of the radio link counter expressed inSACCH blocks. Range of 4 64 in stepsize of 4. it shows current value of RLT.Decrease by 1 but increase by 2. When itreaches zero it results in normal DROPCall.

RL Timeout Counter (MAX) : This parameter define the maximum value of the radio link counter expressed inSACCH blocks. Range of 4 64 in stepsize of 4. it shows current value of RLT.

Normally 16, 20, 24. MS Behavior Modified : This window

shows current settings for the mobilestation, for instance whether handover isdisabled 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

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