06 Training on WCDMA Optimization Cases\(Assistant Data Analysis\) 11 1 Training on WCDMA Optimization Cases (Assistant Data Analysis) 22 2 Genex Assistant Introduction Contents Typical Cases Applicat[.]
Training on WCDMA Optimization Cases (Assistant Data Analysis) Contents Genex Assistant Introduction Typical Cases Application Assistant Technical Characteristics Support the different types of data source and import format Genex Probe Support the combined analysis of uplink and downlink data Analyze the signaling of both UE and RNC to realize simultaneous analysis of uplink and downlink data Agilent E7476A Agilent E6474A Huawei RNC Engineering Parameter Table Neighbor configuration data Assistant Technical Characteristics Support multiple types of data display modes Support Sheet/Map/Chart/Caky/ Histogram display modes Support the import of data displayed in multiple types, such as BMP/JPG/GIF/PNG images, txt documents, and Excel Tab window Image window Map window Assistant Technical Characteristics Support the multi-window bidirectional data cooperation, such as message, event, map, and diagram Provide the automatic report on the UE’s data and Scanner’s data Assistant Technical Characteristics Full layer signaling analysis Support NAS and layer RRC signaling analysis and the query of signaling contents Assistant Technical Characteristics Support the soft handover event by using the SCANNER data and support the parameter settings Contents Genex Assistant Introduction Typical Cases Application Type Case Assistant Prompts Genex License Absence Installing Assistant Start the Assistant software The system prompts no license Find that the hardware dongle is operational Re-install the Assistant software The problem persists Check the installation program and find no Sentinel System Drive software Install the software or un-install the Genex Shared The problem is cleared y9 幻灯片 y9 拼写检查的波浪线提示应该消除 y61891, 2007-6-22 Typical Case – Turning Corner Effect Problem location and troubleshooting Analysis of call drop reasons When the call drop occurs at the corner of the road, due to the blocking of buildings, the signal quality of original cell is degraded fast The UE sends 1A event of SC298 cell, but the Ec/Io of original cell is deteriorated, the UE does not receive the RRC ACTIVE SET UPDATE message delivered by the RNC downlink As a result, the soft handover cannot complete normally and the call drop occurs Troubleshooting If the turning corner effect causes the handover delay and the call drop occurs, the characteristics are that the signals of original cell at the corner are degraded fast and the handover process cannot complete normally The optimization aims to start the handover in advance or avoid the handover at the turning corner Adjust the CIO offset of target cell and improve the handover priority of target cell Hand over to the target cell in advance to avoid the handover failure Adjust the antenna system so that a sector covers the corner to meet the coverage at the corner and to eliminate the handover risks at the corner Adjust the 1a event threshold and hysteresis to ensure the 1a event occurs easier 28 Typical Case – Pinpoint Effect Description of call drop point On the XX road, the call drop occurs At the call drop point, the signal is good Scramble distribution (UE) 29 Ec/Io distribution (UE) Typical Case – Pinpoint Effect Analysis of call drop point Before the call drop, the UE resides on the cell SC16 temporarily After the call drop, the UE camps on the cell SC18 Call drop location From the perspective of Ec/Io quality of UE active set before and after the call drop, before the call drop, the Ec/Io is degraded fast After the call drop, the Ec/Io is restored to normal operation Call drop location 30 Typical Case – Pinpoint Effect Signaling retrospective before and after call drop L3 signaling flow Before the call drop, the UE sends 1a event measurement reports of cells SC9, SC18 and SC17 The RNC correctly receives the measurement reports and notifies NodeB to prepare for the resources And then, the RNC originates an Active Set Update message to the UE If the RNC does not receive Active Set Update Complete message from the UE within five seconds, release the IU The call drop 31 Typical Case – Pinpoint Effect Problem location and troubleshooting Cause analysis The rear lobe of cell SC16 forms the pinpoint effect After the UE camps on the cell SC16, the signal quality is degraded As a result, the UE cannot receive the Active Set Update message delivered by the RNC and the call drop occurs Measures The down tilt of cell SC16 is adjusted from 4º to 9º The pinpoint effect causes the call drop in the following conditions: If the pinpoint duration is short and cannot meet the handover condition, and the call drop does not occur However, the QoS is degraded For example, the downlink generates too high BLER If the pinpoint duration is short, and the handover conditions are strict, the result is that before the handover occurs, the downlink signal is too bad and the signaling or service RB is reset And then, the call drop occurs If the target cell has the handover triggered, the signal of original cell may be too bad and the UE cannot receive the Active Set Update message, and the call drop occurs If the target cell completes the handover and becomes the cell in the active set, the pinpoint effect disappears within short time The cell exits from the active set after a handover This process also may result in the call drop 32 Typical Case – UE Is Abnormal Analysis of call drop point At the call drop point, DTI test signal is good During the moving, the quality of UE active set cell is degraded and the no handover events occur before the call drop Check the neighbor and settings of soft handover parameters Active set Monitor set DTI UE can correct measure the signals of serving cell and neighbor The signals in the Monitor Set are better than that in the Active Set 33 Typical Case – UE Is Abnormal L3 signaling analysis UE does not report and receive the message for about 40 seconds 34 Typical Case – UE Is Abnormal Problem location and troubleshooting Analysis of call drop reasons UE originates calls in the cell SC369 During the moving, UE measures that the Ec/Io of neighbor cell is better than that of active set cell SC369 and 1A event trigger conditions of soft handover are met, but the UE does not send the measurement report normally The signals of cell SC369 are degraded continuously and the UE cannot demodulate the downlink signals The UE sends CELL UPDATE message but the network side does not respond to the CELL UPDATE message The call drop occurs Troubleshooting This call drop occurs because the UE does not send the measurement report normally It is hard to locate the reason In actual operations, we should avoid the test problems caused by the abnormal UE For example, replace the test UE 35 Typical Case 10 – Pilot Pollution Problem analysis On a bridge, the signals from the sites along the river are strong and the pilot pollution is serious As shown in the following diagram, the continuous pilot pollution points exist in the area Check the WCDMA DTI Coverage Bar and find nine scramble cell coverage signals The signal strength ranges from –70 dBm to –80 dBm The pilot pollution is serious and the Ec/Io is degraded dramatically 36 Typical Case 10 – Pilot Pollution Analysis process According to the geographic distribution, judge preliminarily the primary coverage cells After the test, perform the site survey to determine the primary coverage cells Cell SC224 can continuously cover the bridge but the far end signals are weak The site survey finds that the cells SC41 and SC42 are blocked by the high buildings, so the cells cannot effectively cover the bridge 37 Typical Case 10 – Pilot Pollution Analysis process Adjust the antenna to reduce the impact on the bridge of overshooting coverage Due to the impact of water reflection, the cells in red circle cover a far distance and result in the interference to the bridge Adjust the antenna azimuth and tilt to optimize the cell coverage area 38 Typical Case 10 – Pilot Pollution Adjustment and verification Antenna adjustment: The antenna tilt of Huizhou sector A is adjusted from 10 º to º The antenna tilt of Xiti road sector A is adjusted from º to 11 º The antenna tilt of Xiti road sector C is adjusted from º to 10 º The antenna tilt of Shuidongjie sector C is adjusted from º to 11 º The antenna tilt of Golden world sector C is adjusted from º to º Pilot pollution of Huizhou Bridge after the antenna adjustment 39 Huizhou sector coverage after the antenna adjustment Xiti road sector coverage after the antenna adjustment Typical Case 11 – Neighbor Cell Optimization of Whole Network Neighbor optimization of whole network through Assistant Assistant provides rich report statistics functions According to the data collected by the DTI, use the functions of Assistant （dataset）/Analyze Report/WCDMA Scanner NeighborCell Analysis According to the predefined RSCP and COUNT thresholds, analyze automatically the neighbors based on the DIT test data In conjunction with the actual neighbor list, obtain the possible missing neighbor cells Neighbor Cell: RSCP Threshold Count Threshold Only the previous two conditions are met Assistant configures the neighbors 40 Typical Case 11 – Neighbor Optimization of Whole Network Neighbor optimization output of whole network through the Assistant Statistics report Introduction :configuration page of DTI data parameters Scanner Statistic: DTI collection data statistics Scanner Result: analyze the neighbors according to DTI collection data and parameter threshold Imported Config: imported neighbor configuration data Scanner vs Config: comparison between DTI analysis data and the neighbor configuration data 41 42