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TEMS PARAMETER

By

Yinka, Badmus

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Introduction

• This document is to give a better understanding on someparameters that requires monitoring during drive test/analysisof log-files and their importance.

• Parameters in windows like:

a) Current Channelsb) Radio parameter

c) GSM serving + neighbors

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Current Channel

Definitions:

• Time: this is the system time of yourcomputer.

• Cellname: This displays the sectorname as it was on the cellfile that wasloaded in TEMS.

• CGI: It stands for the Cell GlobalIdentity which is unique for everysector of the site. It consists ofMCC,MNC,LAC,CI.

MCC: Mobile Country Code 0 – 999 ( e.g621 in Nigeria), MNC: Mobile NetworkCode 0 – 99 ( e.g 20 for Zain inNigeria) LAC : Location Area Code 0 -65535 (e.g. 597 in Abuja) CI: CellIdentity 0 – 65535 (e.g. 50009

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Current Channel

•Cell GPRS Support: Tells if sector ishaving GPRS or not. Values are Yes or No.

• Band : It tells which Freq. Band mobile isoperating e.g. GSM 900/ 1800.

• BCCH ARFCN: It tells the BCCH bywhich the mobile station is gettingserved.

• TCH ARFCN: On which Traffic Freq. callis 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 shows the state in which mobileis operating, Idle, Dedicated & Packet.

• Time slot: On which time slot currentTCH call is going on. Viz. time slot no. ofTRX.

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Current Channel

• Channel Type: Type of channel mobileis getting. Like BCCH / SDCCH/8 +SACCH/C8 or CBCH / TCH/F+FACCH/F +SACCH/F.

• Channel Mode : Shows mode of codinglike Speech Full Rate or Half Rate.

• Speech Codec: It shows FR for FullRate, HR for Half Rate & EFR forEnhanced Full Rate.

• Ciphering Algorithm : It showsciphering algorithm used by the systemto protect data for privacy. E.g. Cipherby A5/2.

• Sub Channel Number: It is displayed

at a time when mobile is on dedicatedmode at time of call setup when it isgetting SDCCH at that time it showswhich SDCCH it is getting out of 8available. E.g. 2.

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Current Channel

• Hopping Channel : It shows whethercurrent sector is having hoppingfeature or not. Values are Yes or No.

• Hopping Frequencies : It displays no.of freq. on which mobile is allowed tohop. viz. MA List for hopping of thatsector.

• Mobile Allocation Index Offset(MAIO): It is the number which tellsfrom which freq. from given MA listfor sector hopping has to be started.E.g. 0 means sector will start fromfirst freq. to hop.

• Hopping Sequence Number (HSN) :

Indicates sequence in whichfrequencies are allowed to hop fromthe MA List. 0- 63. 0 for CyclicHopping, 1 – 63 random hoppingsequences.

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Radio Parameter

Definitions:• RxLev : Receiving level in terms of

dBm that mobile is receiving from thesite. Range of -30 dBm to -110dBm.

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

•

FER : Frame Erasure Rate itrepresents the percentage of framesbeing dropped due to high number ofnon-corrected bit errors in the frame.It is an indication of voice quality innetwork.

• BER Actual : Ratio of the number ofbit errors to the total number of bitstransmitted in a given time interval.

BER is a measure for the voice qualityin network.. Depending on BER RxQualis measured. E,g, BER 0 to 0.2 %corresponds to RxQual 0. Max. BERcountable and useful is up to 12.8 %which corresponds to RxQual of max.7.

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Radio Parameter

• DTX : Discontinuous transmission(DTX) is a mechanism allowing theradio transmitter to be switched offduring speech pauses. This featurereduces the power consumption of thetransmitter, which is important for

MSs, and decreases the overallinterference level on the radiochannels affecting the capacity of thenetwork..

• TA : Value that the base stationcalculates from access bursts andsends to the mobile station (MS)

enabling the MS to advance the timingof its transmissions to the BS so as tocompensate for propagation delay.Value of 0 means MS in radius of550m. From BS.

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Radio Parameter

• RL Timeout Counter (Cur) : Thisparameter define the maximum valueof the radio link counter expressed inSACCH blocks. Range of 4 – 64 in stepsize of 4. it shows current value ofRLT. Decrease by 1 but increase by 2.

When it reaches zero it results innormal DROP Call.

• RL Timeout Counter (MAX) : Thisparameter define the maximum valueof 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 shows

current settings for the mobilestation, for instance whether handoveris disabled or multiband reportingenabled.

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Serving + Neighbors

Cell Name : Name that describes the neighboring cell as per thecellfile.ARFCN : Channel number mobile receives as neighbor.

BSIC : BSIC of the neighboring cell.RxLev  : Receiving Level in dBm of neighboring cell.C1:This is calculated by the MS and used for deciding which cell tocamp for (selection and reselection). C1 is more useful than justRxLev in cell selection, since it takes the MSTxPwr & MSMaxTxPwr into account. MSMaxTxPwr is the phones maximum output in dBm (forGSM normally 33 but 39 with carkit). The reason Tx power isfactored into C1 is so that an MS only camps to a cell where it has areasonable chance to be heard by the base station if it transmit. 

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Serving + Neighbors

C2 : Cell reselection criterion. Identical to C1 when camped in 900band. You will notice that the dual band units do have a preferencefor the 1800 band. The C1 can be much higher than C2 but it doesn'tresult in the phone switching back to the 900 band. The reason C2 isincluded is to handle small cells, where an MS may select and camp toa cell but not have long enough time to do anything before loosing itcompletely. C2 is time varying so it can get bigger after a certainperiod. If the MS can still see it then it will camp to it.Both C1 & C2 are Valid during idle mode of mobile station.C31 & C32 : GPRS signal strength threshold criterion C31 and GPRS

cell ranking criterion C32. Both are valid in packet idle and packetdedicated mode.

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Example showing the three windows

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Thanks for listening