Sheet1RF Factor Troubleshooting ListNo.Sub-categoryDescription of Sub-categorySymptom DescriptionPedestal Noise SymptomRTWP Symptom in Idle HourRTWP Symptom in Busy hourCheck RecordProblemSolutionSolved?RF interferenceExternal RF interferenceRF interference from another non-communication systemThe symptom and the time range of external RF interference are not fixed. Therefore, during troubleshooting of all RTWP abnormalities, the external RF interference must be troubleshooted.Both stable rise and unstable rise are possible.Both stable rise and unstable rise are possible.Both stable rise and unstable rise are possible.UpgradedInternal RF interference (intermodulation interference)Interference caused by nonlinearity of RF components in the systemThe intermodulation interference is generated by downlink transmit signals, and increases as the increase of the downlink load.The pedestal noise may rise stably.The RTWP fluctuates along with the downlink load.The RTWP fluctuates along with the downlink load.Cell split/Version upgradeNetworking configurationMultiple RRUs in one cellRise due to pedestal noise accumulation when distributed RRUs are located in one cellThe pedestal noise rises stably, rise degree = 10 x log(N).The pedestal noise rises stably.N/AN/ALine amplifier/Tower mounted amplifierThe tower mounted amplifier amplifies uplink signals.When the tower mounted amplifier is configured, the RTWP rises only when the RF parameters (uplink channel attenuation quantity) is incorrectly configured. The pedestal noise rises stably, rise volume (X) = TMA gain antenna feeder/jumper attenuation, and X ranges from 0 to 22.The pedestal noise rises stably.The pedestal noise rises X dB, and the RTWP also rises X dB. The rise is not closely related to sessions.The pedestal noise rises X dB, and the RTWP also rises X dB. The rise is not closely related to sessions.ScenarioNeighboring cell interferenceInterference from a neighboring cell, especially when the neighboring cell configuration is missing and the pilot power of the neighboring cell is different from pilot power of this cellThe neighboring cell interference leads to RTWP rise of the cell, and reduces the capacity and coverage of the cell. Rise between neighboring cells is closely related. Generally, a cell with low pilot power is more greatly interfered with. The neighboring cell missing configuration causes an especially large neighboring cell interference and may also cause call drop.N/AWhen no traffic is available or the traffic is low, the RTWP fluctuates, but the rise degree is not large.The RTWP of this cell fluctuates along with the traffic or RTWP of the neighboring cell.Strong coverageThe minimum transmit power of the UE is 50 dBm. When the UE is very close to the antenna of the NodeB and the coupling loss is too small, the transmit power of the UE reduces to 50 dBm and cannot be reduced any more, which cause extra uplink interference.Such interference occurs only when the user is located in an area with strong coverage (RSCP > 40 dBm). Generally, it is considered that the interference greater than 100 dBm is not caused by strong coverage.N/AThe interference is not stable, and the RTWP rises not greater than 100 dBm.The interference is not stable, and the RTWP rises not greater than 100 dBm. In busy hour, it is most likely that the user is located in an area with strong coverage, and therefore, such interference must have the traffic feature.TrafficService volumeRTWP rise due to too large service volumeThe RTWP fluctuates with the traffic. When the mean RTWP of the traffic is greater than the threshold, the RTWP fluctuates unstably and continuously according to the real-time tracing result.N/AN/AThe RTWP fluctuates with the traffic. When the mean RTWP of the traffic is greater than the threshold, the RTWP fluctuates unstably and continuously according to the real-time tracing result.Signaling (access)RTWP rise due to preamble open loop power controlWith the current open loop power control parameter, the RTWP may still rise during user access. Therefore, such interference has a significant traffic feature, and more particularly, the interference is closely related to the access count.N/AIn the case of low traffic in idle hour, the RTWP peak may occur during user access, and continuous rise may not occur.A large volume of user access occurs in busy hour. Similar to RTWP rise caused by too heavy traffic volume, RTWP rise caused by a large volume of access is unstable and continuous.Parameter configurationAccess power controlWhen the access parameter configuration is improper, the path loss is small. In this case, the open loop power control process during initial user access may cause the UE to rise the transmit power because of the preamble conflict.The open loop power control process during initial user access probably leads to the access peak. The ROT before and after the peak in busy hour is large (about 10 dB). The rise of the peak on the basis of the ROT reaches 15 dB to a maximum. The symptom is similar to the symptom of signaling (access). Such RTWP rise mainly occurs in indoor sites.N/ADuring low traffic in idle hour, the RTWP peak may occur during user access. When the ROT is small, the RTWP peak caused by the RACH is also small. Such RTWP rise mainly occurs in indoor sites.There are two many access users in busy hour, and therefore, the ROT before and after the peak in busy hour is large (about 10 dB). The rise of the peak on the basis of the ROT reaches 15 dB to a maximum. Similar to the RTWP rise caused by too heavy traffic volume in terms of symptom, such RTWP rise is unstable and continuous. Such RTWP rise mainly occurs in indoor sites.RF parametersThe RTWP is abnormal because the RF parameter configuration is inconsistent with the baseline.The RF parameter configuration is improper. As a result, the pedestal noise rises X dB, and the RTWP also rises X dB.The pedestal noise may rise stably by X dB.The pedestal noise rises X dB, and the RTWP also rises X dB. The rise is not closely related to the traffic.The pedestal noise rises X dB, and the RTWP also rises X dB. The rise is not closely related to the traffic.Product defectHSUPA users in the same site but in different resource groups cannot be soft-switched.HSUPA users can be softer-switched but cannot be soft-switched. Untimely switch leads to neighboring cell interference.HSUPA users in the same site cannot be soft-switched. A large number of "Rl ADD fail" occurs. From the traffic measurement, it can be seen that RLM.SuccRLAddIub is much less than RLM.AttRLAddIub. The effect on the RTWP cannot be evaluated, and you can determine whether such problem exists based on the NodeB configuration file.N/AN/AN/AAbnormal delay configurationThe abnormal delay configuration affects the uplink search range and may lead to the UE access difficulty.The UE is difficult to access the system; the RTWP fluctuates strongly; the coverage is shrunk.N/ARTWP peakContinuous peakAbnormal channel configurationThe configuration of the uplink channel on the baseband side is incorrect. As a result, the uplink access/demodulation performance reduces.A small number of users access the system, and the RTWP rises greater than 10 dB; or no user can access the system.N/ARTWP peakContinuous peakSearching abnormality of four antennas in 0.5/0.5 ordinary modeThe Tp calculation during the access process is incorrect. As a result, messages cannot be detected, and the UE is difficult to access the system.This configuration problem always occurs in versions earlier than DBS3900R012C00SPC400: The RTWP fluctuates strongly, or even no user can access the system; the RRC success ratio reduces greatly.N/ARTWP peakContinuous peakAlgorithm defect of window switch in a high-speed scenarioMessages cannot be detected when the UE switches among RRUs in a distributed cell.For the versions earlier than DBS3900R012C00SPC400, the RRU delay difference in a high-speed scenario is large. The RTWP peak occurs when an access UE moves among RRUs.N/ARTWP peakFrequent peakiPhone terminal compatibilityWhen releasing the link, the iPhone terminal always sends two RRC_REL_COMP messages. The wireless link on the baseband side is deleted when the second message is sent. The terminal is out of synchronization in the uplink direction, the transmit power is high, and the RTWP rises.When the iPhone releases the link, the RTWP peak occurs, and the RTWP on the NodeB rises greater than 5 dB.N/ARTWP peakFrequent peakMisplacement of the Betac and Betad parametersThe Betac and Betad parameters are misplaced. As a result, when the UE does not transmit data, the SIR estimation keeps very low, and the power control leads to power rise of the UE.The RTWP peak is frequent, and the average RTWP value is not high.N/ARTWP peakFrequent peakAlgorithm defectCE occupation of users of small trafficDue to CE withdrawal of users of small traffic, the first block or first several blocks are erroneous block when the user performs data transmission again. In this case, the SIR-Target may be adjusted to be too high, which causes the RTWP to rise.When more than 10 HSDPA users download data, the uplink data is born on the HSUPA for 2 ms, and the ROT rises about several dozens of dB, which causes call drop of the users.N/AThe RTWP change is not closely related to the traffic change, and the peak is about several dozens of dB. The RTWP does not rise continuously.The RTWP change is not closely related to the traffic change, and the peak is about several dozens of dB. The RTWP does not rise continuously. The peak is most likely to occur when the traffic is busy.Bug of SIR estimation optimizationIn the SIR estimation optimization algorithm, different antenna quantities are all considered as 2. As a result, in the case of a single antenna, the obtained N0 value is greater than the actual N0 value, and the SIR estimation value is less than the actual value. This causes RTWP rise.In the case of a single antenna (common in the indoor coverage scenario), the bug causes the transient SIR estimation value to be less than the actual value, and the RTWP rises a little.N/AThe RTWP change is not closely related to the traffic change, and the RTWP only rises a little.The RTWP change is not closely related to the traffic change, and the RTWP only rises a little.DAGC noise filterDuring switch between the high-speed service rate and the low-speed service rate, the noise power jumps before and after the switch due to the changes of the DAGC factor. If the noise is filtered, the SIR estimation is inaccurate. When the low-speed service rate switches to the high-speed service rate, the SIR estimation is lower than the actual value, and the RTWP rises.In the single-user scenario or multiple-user scenario, when the switch from the low-speed rate service to the high-speed rate service, the RTWP rises. The RTWP may reach 40 dB, and the duration is several dozens of ms. The specific RTWP rise amplitude and duration are related to the user quantity, ROT, and rate jump amplitude.N/AThe RTWP change is not closely related to the traffic change, and the RTWP rises in idle hour in a smaller amplitude and probability than those in busy hour.The RTWP change is not closely related to the traffic change, and rises in larger amplitude and probability in busy hour.

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