cdma parameters

8/6/2019 Cdma Parameters

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1)TXPOWER2)RXPOWER3)Ec/Io4)TXADJ5)FER.

1.EcIo

EcIo reflects the handset in the current received pilotsignal level. This is an integrated pilot signal. Why,because mobile phones are a multi-channel soft switching,

which translates into mobile phones often lies in morethan one pilot overlapping coverage area, the level of thephone, EcIo reflects the phone at this point that a multi-channel pilot signal level of the overall coverage. We knowthat the Ec is a mobile phone available pilot signalstrength, and Io is the mobile phone receives all thestrength of the signal. Therefore, EcIo reflects theavailable signal strength in occupies all signals. The higher

the value, the greater the proportion of a useful signal, onthe other hand also reversed. At some point EcIo big, thereare two possibilities. First, the Ec is very large, dominantlevel here, Ec, Io is very small, that is to say here is fromanother basestation's messy little pilot signal, EcIo alsolarger. In the latter case is weak, because the Ec small, Iois also small, so small, so RSSI also there may be dropped.

At some point EcIo also small, there are two possible, first,the Ec is also small small RSSI, this is the weak coveragearea. The Ec is not small, RSSI, this illustrates the Io is theoverall intensity of the signal is not bad. This situation isoften a BSC switch data configuration, no nearby strongpilot signal into the adjacent community table, so the



phone doesn't recognize the strong pilot signal in thevicinity as a jamming signal processing. On the road, in thecase of a typical phenomenon is the phone in a move tomaintain certain RSSI, EcIo level, rapid rise to FER andeventually dropped.

2 TXPOWER

TXPOWER is the phone's transmitter power. We know thatpower control is guaranteed call quality and address theCDMA

community interference tolerance and one of the keymeans of mobile phone from the base station near, uplinkqualitygood, the mobile phone transmitting power is smaller,because at the base station is able to guarantee thereception of the signal to launch mobile phone and fer alsosmall and mobile phones transmitting power is smaller toother mobile phones in the community is also a small

interference. So mobile phones transmit power level,reflecting the handset's current uplink loss andinterference. Uplink loss of large, or there is seriousinterference with the phone's transmitter power will begreatly missed mobile phonetransmitting power is smaller.Roadtest, in normal circumstances, the more closer to thebase station or Repeater, the mobile phone transmitting

power is reduced, away from the base station andRepeater, the mobile phone transmitting power increases.If the base station and Repeater nearby mobilephone transmitting power, obviously it is not normal.Perhaps there is interference, the uplink can be abase station and Repeater itself. Such as



community antenna wrong receive carrier frequencyamplifier circuit problems, etc. If the Repeater nearby,cell phone transmitter power, it may be a Repeatermalfunctions, uplink gain set too small, and so on.Aboveyou can see, the road of TXPOWER level reflects thebase station coverage area of reverse link quality anduplink interference levels.

3R XPOWER

RXPOWER is a mobile phone to receive power. In CDMA,

according to my personal understanding, there are threeparameters is very close by, you can almost equivalent tothe use of parameters. Namely RXPOWER, RSSI, Io.RXPOWER is a mobile phone to receive power, Io is mobilephones currently receives all signal strength, RSSI isreceives downlink band of total power, as currently I haveaccess to information, the title explains, butunderstanding is very similar, is the phone receives a total

of signal strength. RXPOWER and reflects the current signalreceiving phone, RXPOWER small area, the weak positivefall within the coverage area, RXPOWER places belong tothe covered area. But the high places, RXPOWER and doesnot necessarily signal quality is good, because there maybe no signal, leading to frequency, or too many strongpilot, pilot frequency pollution. Therefore, the analysis of

RXPOWER to EcIo to analysis.Above you can see, RXPOWERand simply reflects the drive test signal coverage area,rather than the quality of the signal coverage.

4TXADJ



TXADJ reflects the up and down-link a balance. Note thatthis value is calculated from the measurement, instead.800M CDMA system is Tx_adjust = 73dB + Tx_power +Rx_power, 1900M CDMA is Tx_adjust = 76dB + Tx_power +Rx_power.TXADJ reflects the current location of the mobile uplinkand downlink of a more mass. We know that under normalcircumstances, the cell phone away from thebase stationclose to the phone's transmitter power willdecrease, andreceived power will become larger and far away from the

cell phone, mobile phone base station transmitter powerwill increase while receiving power gets smaller. Normally,the transmitter power and receiver power plus a constantfixed values, the result should be a small interval (forexample,-10 to + 10). If TXADJ great, it means that thephone's transmitter power, receive the power, then it isobvious that mobile current downlink of good quality(receiving power), and the poor quality of the uplink(transmitter power), this time forward link is better than areverse link. On the contrary, TXADJ is very small, explainsthis reverse link well to the forward link. We know thatthe basestation coverage depends on the reverselink loss level. Therefore, in General, we require thefollowing TXADJ in 0. But greater than 10, the reverse linkforward link than are poor, the situation is not ideal. For

TXADJ, nor can they be said to be as small as possible. Butin the actual drive test, we generally encounter, oftenTXADJ too high, forward link, reverse link.



5 FER FER is a forward-fer. Forward fer with EcIo also is acomprehensive quality of forward link. Because when thephone is in the multi-channel soft switching, fer actuallymulti-channel forward an integrated signal quality.FER, description of the mobile phone of the forward linkbetter, received signal is good, this time EcIo also shouldbe better. The larger the Description cell phone FER thereceived signal strength is poor, EcIo should also at thistime. FER is large, it may also be due to a neighboringcommunity switch parameter configuration error. If you

switch between adjacent community with leakage, singleand mobile to mobile, adjacent to the pilot was notrecognized, and the pilotdoes not recognize, it willbecome interference signal, resulting in increased FER. Inreality, often manifested in mobile, mobile phones, FER arapid rise in sharp decline, EcIo, and finally dropped.Abovethat is closely followed by EcIo FER. FER reflects the callquality is good or bad, reflects the RoadTest regionalcoverage quality level, rather than the signal coveragestrength level. In some areas although belonging to theweak signal coverage area, but relatively clean (messysignals, noise), as well as be good FER.Note the above parameters, EcIo, RXPOWER is the phone instandby or call have parameters, TXPOWER, TXADJ, FER isonly a phone call and from the only parameter. The above

five parameters, together, to analysis of drive test regionto cover the intensity level, the former to override thequality level, as well as the reverse link loss level, and soon, is the analysis of drive test is the most importantparameters. In-depth understanding of the five



parameters, combined with the overall situation for drivetesting specific analysis, is engaged in networkoptimization staff in one of the basic conditions.

cdma parameters

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