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Zte umts-handover-description

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  • 1. ZTE UMTS Handover Description
  • 2. 2 Contents  Intra-Frequency Handover Strategy  Inter-Frequency Handover Strategy  Inter-RAT Handover Strategy
  • 3. 3 Contents  Intra-Frequency Handover Strategy  Inter-Frequency Handover Strategy  Inter-RAT Handover Strategy .
  • 4. 4 Intra-Frequency Handover Sample Time Ec/No P CPICH 1 P CPICH 2 Reporting Event 1D Reporting Event 1B Reporting Event 1A TrigTime1A TrigTime1D RptRange 1A Hysteresis 1A /2 Add P CPICH 2 in Active Set Change the best cell to P CPICH2 TrigTime1B Hysteresis 1D /2 RptRange 1B + Hysteresis 1B /2 Drop P CPICH 1 from Active Set
  • 5. 5 Intra-Frequency Handover Strategy  Intra-frequency handover refers to the handover performed between cells under the same frequency point of UTRAN. The intra-frequency handover can be triggered based on Ec/N0 or RSCP measurement through the parameter IntraMeasQuan.Intra-frequency handover is measurement-based handover. Intra-frequency measurement contains active set measurement, monitored set measurement and detected set measurement.  The active set refers to the collection of cells retaining radio connection with UE.  The monitored set refers to the collection of cells retaining no radio connection with UE but requiring measurement by sending the intra-frequency measurement control message to UE.  The detected set refers to the collection of intra-frequency cells except cells in the active set and monitored set.
  • 6. 6 Intra-Frequency Handover Strategy  ZTE uses Event 1A、Event1B、Event1C、Event1D for intra-frequency handover.  Event 1A: The quality of target cell ameliorates and enters a reporting range of relative active set quality. It can be used for adding cell to the active set.  Event 1B: The quality of target cell worsens and leaves a reporting range of relative active set quality. It can be used for dropping cell from the active set.  Event 1C: The quality of a cell in non-active set is better than that of a cell in certain active set. It can be used for swapping into and out of the active set.  Event 1D: The best cell changes. It can be used for adding cell to the active set, swapping into and out of the active set, intra-frequency hard handover or inter- frequency load balance.
  • 7. 7 Intra-Frequency Handover Strategy:1A /2)H(RLogM10W)(1MLog10WCIOLogM10 1a1aBest N 1i iNewNew A          R1a: Refers to the reporting range of Event 1A. It is used to control the extent of difficulty in adding a cell into the active set (RptRange).  H1a: Refers to the reporting hysteresis of Event 1A. It is used to control the extent of difficulty in adding a cell into the active set (Hysteresis(Intra)).  MNew: Refers to measurement of the to-be-evaluated cell outside the active set.  CIONew: Refers to offset of cell outside active set in relation to other cells (CellIndivOffset (utranRelation)).  Mi: Refers to the mean measurement value of other cells except the best cell in active set.  NA: Refers to the number of other cells except the best cell in active set.  MBest: Refers to the measurement of the best cell in the active set.  W: Refers to the weight proportion (W) of the best cell to the rest cells in the active cell in evaluation standards.
  • 8. 8 Intra-Frequency Handover Strategy:1A  As can be calculated from the above formula, you can increase the probability of triggering Event 1A by either increasing R1a (Event 1A meets the reporting range conditions) or decreasing H1a (Decision hysteresis range); otherwise, you can reduce the probability of triggering Event 1A.  Event 1A supports period-based report, that is, once Event 1A meets the reporting range of quality standards, the UE will report Event 1A periodically (EvtRptInterval) until this event does not meet reporting conditions or the reporting times reach the maximum allowed times (EvtRptAmount).  There is restriction over the size of active set, so Event 1A will not be reported once the number of cells in the active set reaches certain threshold (RptDeactThr).
  • 9. 9 Intra-Frequency Handover Strategy:1B  R1b: Refers to the reporting range of Event 1B. It is used to control the extent of difficulty in dropping a cell from the active set (RptRange).  H1b: Refers to the reporting hysteresis of Event 1B. It is used to control the extent of difficulty in dropping a cell from the active set (Hysteresis(Intra)).  MOld: Refers to measurement of the to-be-evaluated cell in the active set.  CIOOld: Refers to offset of cell in active set in relation to other cells (CellIndivOffset (utranCell)).  Mi: Refers to the mean measurement value of other cells except the best cell in active set.  NA: Refers to the number of other cells except the best cell in active set.  MBest: Refers to the measurement of the best cell in the active set.  W: Refers to the weight proportion (W) of the best cell to the rest cells in the active cell in evaluation standards.  As can be calculated from the above formula, you can decrease the probability of triggering Event 1B by either increasing R1b (Event 1B meets the reporting range conditions) or decreasing H1b (Decision hysteresis range); otherwise, you can increase the probability of triggering Event 1B. /2)H(RLogM10W)(1MLog10WCIOLogM10 1b1bBest N 1i iOldOld A        
  • 10. 10 Intra-Frequency Handover Strategy:1C  H1c: Refers to the reporting hysteresis of Event 1C. It is used to control the extent of difficulty in replacing a cell in the active set (Hysteresis(Intra)).  MNew: Refers to measurement of the to-be-evaluated cell outside the active set.  MInAS: Refers to the cell with poorest quality in the active set.  CIONew: Refers to offset of cell with poorest quality in active set in relation to other cells (CellIndivOffset (utranCell)).  CIOInAS: Refers to offset of the to-be-evaluated cell outside the active set in relation to other cells (CellIndivOffset (utranRelation)).  As can be calculated from the above formula, you can decrease the probability of triggering Event 1C by increasing H1c (decision hysteresis range); otherwise, you can increase the probability of triggering Event 1C.  Event 1C supports period-based report, that is, once Event 1C meets the reporting range of quality standards, the UE will report Event 1C periodically (EvtRptInterval) until this event does not meet reporting conditions or the reporting times reach the maximum allowed times (EvtRptAmount).  To ensure the gain of macro diversity, the report of Event 1C is only allowed when the number of cells in the active set reaches certain threshold (RplcActThr). /2HCIOLogM10CIOLogM10 1cInASInASNewNew 
  • 11. 11 Intra-Frequency Handover Strategy:1D  MNotBest: Refers to the measurement of the to-be-evaluated cell within or outside the active set.  CIONotBest: Refers to the offset of the to-be-evaluated cell within the active set (CellIndivOffset (utranCell)) or outside the active set (CellIndivOffset (utranRelation)) in relation to other cells.  CIOBest: Refers to offset of the to-be-evaluated cell in the active set in relation to other cells (CellIndivOffset (utranCell)).  MBest: Refers to the measurement of the to-be-evaluated cell in the active set.  H1d: Refers to Event 1D report hysteresis (Hysteresis(Intra)).  As can be calculated from the above formula, you can decrease the probability of triggering Event 1D by increasing H1d (decision hysteresis range); otherwise, you can increase the probability of triggering Event 1D. /2HCIOLogM10CIOLogM10 1dBestBestNotBestNotBest 
  • 12. 12 Intra-Frequency Handover Strategy:1D  Event 1D indicates the quality of certain cell within or outside current active set is better than the best cell in current active set, that is, the best cell changes in the active set. The following can be triggered upon the receipt of Event 1D:  Add a cell into the active set (the cell outside the active set reports Event 1D and the number of links in the active set does not reach the maximum).  Swap a cell into or out of the active set (the cell outside the active set reports Event 1D but the number of links in the active set reaches the maximum).  The serving cell changes (for HS-DSCH/E-DCH).
  • 13. 13 Intra-Frequency Handover Strategy:Handling of Over 32 Adjacent Cells  When there are many cells in an active set, the number of intra-frequency adjacent cells in the active set may exceed 32, the maximum number of adjacent cells as restricted in the protocol. In that case, some intra-frequency adjacent cells must be dropped to ensure there are only 32 adjacent cells in the neighboring cell list. Having minimal impact on users in the active set, these dropped cells are those with poorest signal quality or remotest geographical location. Therefore, each intra-frequency adjacent cell is configured with a priority level.  The background configuration parameter MeasPrio is used to define the priority of adjacent cells and includes three values (0: High priority; 1: Medium priority; 2: Low priority). The specific value of MeasPrio must be set by the network planning engineer based on existing network situation (for example, adjacent cell quality and geographical location of adjacent cell).
  • 14. 14 Intra-Frequency Handover Strategy:Handling of Over 32 Adjacent Cells  The graph shows the cell priority configuration based on the geographical location of adjacent cells. Take the configuration of cells adjacent to the innermost gray cell as an example: there are three layers of adjacent cells surrounding the gray cell, and they are differentiated from one another with yellow (0: Top priority), blue (1: Medium priority) and red (2: Low priority)  The principle for inter-freq neighboring cells and inter-rat neighboring cells are same.
  • 15. 15 Intra-Frequency Handover: Detected set Handover  The detected set handover is controlled through the parameter DetSetHoSwch ,If the detected set handover is enabled, then the RNC handles the cell in the detected set in the same way as it does in the monitored set, that is, to make decision about handover.  If the detected set handover of the best cell is enabled and there are over 32 adjacent cells, the detected set measurement will be initiated. Initiation strategy: Change “1A Triggering condition 2” into “Detected set cells and monitored set cells”, and “Reporting cell status” into “Report all active set cells + cells within monitored set and/or detected set on used frequency”, that is, perform measurement report of active set, monitored set and detected set concurrently by sharing the same set of handover measurement parameters.  If the detected set handover of the best cell is disabled or there are less 32 adjacent cells, then change “1A Triggering condition ” into “Monitored set cells” and “Reporting cell status” into “Report cells within active set and/or monitored set cells on used frequency”, that is, to only report the monitored set instead of detected set.
  • 16. 16 Intra-Frequency Handover Parameter Parameter name Measurement Priority of Neighboring Cell Abbreviated name MeasPrio Description This parameter indicates the measurement priority of the neighboring cell. The highest priority is 0, the lowest priority is 2. Range and Step [0, 1, 2] Unit N/A Default Value (note) 0
  • 17. 17 Intra-Frequency Handover Parameter Parameter name Detected Set Handover Switch Abbreviated name DetSetHoSwch Description This parameter is the detected set handover control switch. Range and Step 0: Closed 1: Open Unit N/A Default Value (note) 1: Open
  • 18. 18 Intra-Frequency Handover Parameter Parameter name Reporting Range Constant for Event 1A/1B(dB) Abbreviated name RptRange [MAX_INTRA_MEAS_EVENT] Description This parameter controls the triggering of event 1a/1b. 1a is easier but 1b is harder to trigger when this value increases; and vice verse. MAX_INTRA_MEAS_EVENT indicates the maximum number of intra- frequency measurement event, which is 7. Range and Step [0, 14.5]dB step 0.5dB Unit dB Default Value (note) Period Report Parameters for CPICH Ec/No: - UE Event Report Parameters for CPICH Ec/No: [3,5,0,0,0,0,0] Period Report Parameters for CPICH RSCP: - UE Event Report Parameters for CPICH RSCP: [6,8,0,0,0,0,0]
  • 19. 19 Intra-Frequency Handover Parameter Parameter name Weight for Event 1A/1B Abbreviated name W[MAX_INTRA_MEAS_EVENT] Description This parameter is used for quality judgment of event 1a and 1b, which indicates the weight of the best cell in the quality judgment and is related to the measurement quantity and the event type. MAX_INTRA_MEAS_EVENT indicates the maximum number of intra-frequency measurement event, which is 7. Range and Step [0.0, 2.0] step 0.1 Unit N/A Default Value (note) Period Report Parameters for CPICH Ec/No: - UE Event Report Parameters for CPICH Ec/No: [0. 0 0. 0 0. 0 0. 0 0. 0 0. 0 0. 0] Period Report Parameters for CPICH RSCP: - UE Event Report Parameters for CPICH RSCP: [0. 0 0. 0 0. 0 0. 0 0. 0 0. 0 0. 0]
  • 20. 20 Intra-Frequency Handover Parameter Parameter name Hysteresis(dB) Abbreviated name Hysteresis[MAX_INTRA_MEAS_EVENT] Description This parameter indicates the hysteresis used when judging whether to trigger the event. This parameter makes it different between the status to trigger an event and the status to leave the event, so as to avoid the trigger status change due to very small change. The larger the value is, the larger the difference between the status to trigger the event and the status to leave the event will be. This parameter is related to the measurement quantity and the event type. Different events are configured separately and can be configured with different hysteresis MAX_INTRA_MEAS_EVENT indicates the maximum number of intra-frequency measurement event, which is 7 Range and Step [0, 7.5]dB step 0.5dB Unit dB Default Value (note) Period Report Parameters for CPICH Ec/No: - UE Event Report Parameters for CPICH Ec/No: [0,0,4,4,2,2,4] Period Report Parameters for CPICH RSCP: - UE Event Report Parameters for CPICH RSCP: [4,4,6,6,4,4,6]
  • 21. 21 Intra-Frequency Handover Parameter Parameter name Filter Coefficient Abbreviated name FilterCoeff Description This parameter indicates the filtering factor that UE performs the L3 filtering on the measurement results of the intra-frequency measurement. Range and Step [0, 7.5]dB step 0.5dB Unit dB Default Value (note) Period Report Parameters for CPICH Ec/No: 2 UE Event Report Parameters for CPICH Ec/No: 2 Period Report Parameters for CPICH RSCP: 3 UE Event Report Parameters for CPICH RSCP: 3
  • 22. 22 Intra-Frequency Handover Parameter Parameter name Time To Trigger(ms) Abbreviated name TrigTime[MAX_INTRA_MEAS_EVENT] Description This parameter indicates the time difference between having detected the event generation and reporting the event. Only when the event generation is detected and still meets all requirements of event triggering after Time to trigger, the event can be triggered and reported. The larger the value is, the stricter the judgment is for the event to be triggered. The parameter should be set according to the actual requirements. Sometimes, if it is set too large, the quality of calls may decrease. MAX_INTRA_MEAS_EVENT indicates the maximum number of intra-frequency measurement event, which is 7. Range and Step (0, 10, 20, 40, 60, 80, 100, 120, 160, 200, 240, 320, 640, 1280, 2560, 5000)ms Unit N/A Default Value (note) Period Report Parameters for CPICH Ec/No: - UE Event Report Parameters for CPICH Ec/No: [200,640,320,320,200,200, 320]ms Period Report Parameters for CPICH RSCP: - UE Event Report Parameters for CPICH RSCP: [200,200,200, 200,200,200,200]ms
  • 23. 23 Intra-Frequency Handover Parameter Parameter name Amount of Reporting in Period Report Criteria Abbreviated name PrdRptAmount Description This parameter indicates the times of the periodical reports to be reported. If the UE detects that the times of event reports exceeds the value of Amount of reporting, UE stops reporting the measurement results. Range and Step [1, 2, 4, 8, 16, 32, 64, Infinity] Unit N/A Default Value (note) Period Report Parameters for CPICH Ec/No: Infinity UE Event Report Parameters for CPICH Ec/No: - Period Report Parameters for CPICH RSCP: Infinity UE Event Report Parameters for CPICH RSCP: -
  • 24. 24 Intra-Frequency Handover Parameter Parameter name Reporting Interval in Period Report Criteria(ms) Abbreviated name PrdRptInterval Description This parameter indicates the interval of periodical reporting when such reporting is triggered periodically. Range and Step [250, 500, 1000, 2000, 3000, 4000, 6000, 8000, 12000, 16000, 20000, 24000, 28000, 32000, 64000]ms Unit Ms Default Value (note) Period Report Parameters for CPICH Ec/No: 1s UE Event Report Parameters for CPICH Ec/No: - Period Report Parameters for CPICH RSCP: 1s UE Event Report Parameters for CPICH RSCP: -
  • 25. 25 Intra-Frequency Handover Parameter Parameter name Cell Individual Offset (UtranCell) Abbreviated name CellIndivOffset Description An offset is allocated for each cell being monitored. The offset can be positive or negative. Before the UE judges whether an event occurs, adds the offset to the measurement result. If the PCPICH uses a positive offset, the UE sends the measurement report just like PCPICH is x dB better than the actual case. Or, if the PCPICH uses a negative offset, the PCPICH report is limited. When the cell individual offset is used, the corresponding cell is possibly (at least temporarily) the target cell of the handover or removed from the active set. Range and Step OMCR:[ -10, 10 ] dB step 0.5 dB RNC:D = ( P+10 ) * 2, [ 0, 40 ] Unit dB Default Value (note) 0dB
  • 26. 26 Intra-Frequency Handover Parameter Parameter name Cell Individual Offset (UtranRelation) Abbreviated name CellIndivOffset Description An offset is allocated for each cell being monitored. The offset can be positive or negative. Before the UE judges whether an event occurs, adds the offset to the measurement result. If the PCPICH uses a positive offset, the UE sends the measurement report just like PCPICH is x dB better than the actual case. Or, if the PCPICH uses a negative offset, the PCPICH report is limited. When the cell individual offset is used, the corresponding cell is possibly (at least temporarily) the target cell of the handover or removed from the active set. Range and Step OMCR: [-10, 10]dB; Step 0.5 RNC: D=(P+10)*2, [0, 40] Unit dB Default Value (note) 0 dB
  • 27. 27 Intra-Frequency Handover Parameter Parameter name Reporting Deactivation Threshold for Event 1A Abbreviated name RptDeactThr[MAX_INTRA_MEAS_EVENT] Description This parameter indicates the maximum number of the cells that can exist in the active set in order for event 1a to occur,. 0 means not applicable Range and Step (0, 1, 2, 3, 4, 5, 6, 7) Unit N/A Default Value (note) Only configured for event 1A. Period Report Parameters for CPICH Ec/No: - UE Event Report Parameters for CPICH Ec/No: [2, -, -, -, -, -, -] Period Report Parameters for CPICH RSCP: - UE Event Report Parameters for CPICH RSCP: [2, -, -, -, -, -, -]
  • 28. 28 Intra-Frequency Handover Parameter Parameter name Replacement Activation Threshold for Event 1C and 1J Abbreviated name RplcActThr[MAX_INTRA_MEAS_EVENT] Description This parameter indicates the minimum number of the cell that can exist in the DCH active set when triggering event 1c or in the E-DCH active set when triggering event 1j. When UE detects that one cell satisfies the trigger threshold of event 1c/1j, it first judges whether the number of the cells in the current active set is smaller than the value indicated by this parameter. If so, do not trigger event 1c/1j. If the value is 0, the parameter is invalid. MAX_INTRA_MEAS_EVENT indicates the maximum number of intra- frequency measurement event, which is 7. Range and Step (0, 1, 2, 3, 4, 5, 6, 7) Unit N/A Default Value (note) Only configured for event 1c and 1j. Period Report Parameters for CPICH Ec/No: - UE Event Report Parameters for CPICH Ec/No: [-, -, 3, -, -, -, 3] Period Report Parameters for CPICH RSCP: - UE Event Report Parameters for CPICH RSCP: [-, -, 3, -, -, -, 3]
  • 29. 29 Intra-Frequency Handover Parameter Parameter name UTRAN Measurement Quantity for Intra-frequency Measurements Abbreviated name IntraMeasQuan Description This parameter indicates UTRAN measurement quantity for intra-frequency measurements. Range and Step 0: Ec/No 1: RSCP 2: Ec/No and RSCP Unit N/A Default Value (note) 0: Ec/No
  • 30. 30 Intra-Frequency Handover Parameter Parameter name CPICH Ec/No Reporting Indicator Abbreviated name EcN0RptInd Description This parameter indicates whether UE should report the measurement result based on the measurement quantity CPICH Ec/No. Range and Step 0: False (No Report) 1: True (Report) Unit N/A Default Value (note) Period Report Parameters for CPICH Ec/No: True UE Event Report Parameters for CPICH Ec/No: True Period Report Parameters for CPICH RSCP: True UE Event Report Parameters for CPICH RSCP: True
  • 31. 31 Intra-Frequency Handover Parameter Parameter name CPICH RSCP Reporting Indicator Abbreviated name RscpRptInd Description This parameter indicates whether UE should report the measurement result based on the measurement quantity CPICH RSCP. Range and Step 0: False (No Report) 1: True (Report) Unit N/A Default Value (note) Period Report Parameters for CPICH Ec/No: True UE Event Report Parameters for CPICH Ec/No: True Period Report Parameters for CPICH RSCP: True UE Event Report Parameters for CPICH RSCP: True
  • 32. 32 Intra-Frequency Handover Parameter Parameter name Pathloss reporting indicator Abbreviated name PathlossRptInd Description This parameter indicates whether UE should report the measurement result based on the measurement quantity pathloss. Range and Step 0..65535 Unit N/A Default Value (note) Period Report Parameters for CPICH Ec/No: False UE Event Report Parameters for CPICH Ec/No: False Period Report Parameters for CPICH RSCP: False UE Event Report Parameters for CPICH RSCP: False
  • 33. 33 Intra-Frequency Handover Parameter Parameter name Event Number of Intra-frequency Measurement Abbreviated name MeasEvtNum Description This parameter indicates how many events are required to be configured for the set of the intra-frequency measurement parameters for a certain purpose. The number of the events is related to the purpose of the measurement and the judgment method of the soft handover. The measurement parameter of the soft handover is related to the number of the events in the soft handover algorithm. Range and Step [1,MAX_INTRA_MEAS_EVENT] in which,MAX_INTRA_MEAS_EVENT =7. Unit N/A Default Value (note) Period Report Parameters for CPICH Ec/No: - UE Event Report Parameters for CPICH Ec/No: 7 Period Report Parameters for CPICH RSCP: - UE Event Report Parameters for CPICH RSCP: 7
  • 34. 34 Intra-Frequency Handover Parameter Parameter name Maximum Number of Cells Within DCH Active Set Abbreviated name MaxNumOfAct Description This parameter indicates the maximum number of cells within DCH active set. Range and Step [1, 6] Unit N/A Default Value (note) 3
  • 35. 35 Intra-Frequency Handover Parameter Parameter name Soft Handover Method Abbreviated name SoftHoMth Description The parameter indicates the soft handover method is periodical method or event method. Range and Step 0: Periodical method 1: Event method Unit N/A Default Value (note) 1: Event method
  • 36. 36 Intra-Frequency Handover Parameter:High speed scenario Default configuration High speed (fast fade) scenario Reporting Range Constant for Event 1A 3dB 4dB Hysteresis for Event 1A 0dB 0dB Time to Trigger for Event 1A 200ms 100ms Reporting Deactivation Threshold for Event 1A 2 2 Amount of Reporting for Event 1A 4 4 Reporting Range Constant for Event 1B 5dB 7dB Hysteresis for Event 1B 0dB 0dB Time to Trigger for Event 1B 640ms 1280ms Hysteresis for Event 1C 4dB 2dB Time to Trigger for Event 1C 320ms 320ms Hysteresis for Event 1D 4dB 4dB Time to Trigger for Event 1D 320ms 320ms
  • 37. 37 Contents  Intra-Frequency Handover Strategy  Inter-Frequency Handover Strategy  Inter-RAT Handover Strategy
  • 38. 38 Inter-Frequency Handover Sample
  • 39. 39 Inter-Frequency Handover Strategy  The inter-frequency handover is a feature in which the UE hands over from one frequency point of UTRAN to another one. It can either be handover based on inter-frequency measurement, or blind handover based on shared coverage or inclusion.  The prerequisite for measurement-based inter-frequency handover is that UE performs quality measurement of non-current serving carrier. For inter-frequency measurement in CELL_DCH state, UE needs to initiate compressed mode unless it has double-receiver. The compressed mode has a impact on both the resource consumption (for example, downlink power and uplink interference) and UE (for example, the transmit power and battery consumption), so inter-frequency measurement is only initiated when the radio quality of current serving carrier is poor .  Upon receiving the inter-frequency measurement results from UE, the RNC makes a decision about inter-frequency handover, and hands over UE to the target frequency point and cell carried in the measurement results.
  • 40. 40 Inter-Frequency Handover Strategy: Inter-Frequency Measurement  Qfrequency j: Refers to (Virtual) active set quality of carrier j, that is, the measurement result of carrier j (dB for Ec/No; dBm for RSCP).  Mfrequency j: Refers to the physical measurement value (ratio for Ec/No; mW for RSCP) of the (Virtual) active set of carrier j.  Mi j: Refers to the physical measurement value of cell i of carrier j.  NA j: Refers to the number of cells (excluding best cell) in the (Virtual) active set of carrier j.  MBest j: Refers to the measurement result of the best cell in the (Virtual) active set of carrier j.  Wj: Refers to the weight (WnoUsed or Wused) of the best cell in the (Virtual) active set of carrier j during carrier measurement. jBestj N 1i jijjfrequencyfrequencyj LogM10)W(1MLog10WLogM10Q jA          
  • 41. 41 Inter-Frequency Handover Strategy  ZTE UMTS support event 2A、2B、2C、2D、2F for inter-frequency handover.  Among all inter-frequency measurement events, Event 2D and Event 2F only involve measurement of working carrier frequencies, so the compressed mode is not required during measurement and extra overhead will not be brought about to both UE and RNC. The compressed mode and event 2A、 2B or 2C can be enabled and disabled based on the trigger of 2D and 2F.  Event 2A、2B、2C are used to trigger inter-frequency handover. The three events are controlled by parameter InterHoTactic and will not be worked at the same time.  All non-working carrier frequencies report Event 2E, indicating that radio quality of all inter-frequency neighbor cells is poor and UE is at the edge of 3G coverage, then RNC may open inter-RAT measurement.
  • 42. 42 Inter-Frequency Handover Strategy:2A  Evnet 2A: The best carrier frequency changes  QNotBest: Refers to the measurement result of current non-best carrier frequency.  QBest : Refers to the measurement result of current best carrier frequency.  H2a : Refers to handover decision hysteresis parameter (Hysteresis(Inter)) of Event 2A. /2HQQ 2aBestNotBest 
  • 43. 43 Inter-Frequency Handover Strategy:2B  Evnet 2B: The quality of working carrier frequency is lower than a threshold and that of non-working carrier frequency is higher than a threshold  QNon used: Refers to the measurement result of current non-working carrier frequency.  TNon used 2b: Refers to the absolute threshold (ThreshNoUsedFreq) of good quality of non-working carrier frequency in Event 2B decision.  H2b : Refers to handover decision hysteresis parameter (Hysteresis(Inter)) of Event 2B.  QUsed: Refers to the measurement result of current working carrier frequency.  TUsed 2b: Refers to the absolute threshold (ThreshUsedFreq) of poor quality of working carrier frequency in Event 2B decision. /2HTQ 2b2busedNonusedNon  /2HTQ 2b2bUsedUsed and
  • 44. 44 Inter-Frequency Handover Strategy:2C  QNon used: Refers to the measurement result of current non-working carrier frequency.  TNon used 2c : Refers to the absolute threshold (ThreshNoUsedFreq) of good quality of non-working carrier frequency in Event 2C decision.  H2c: Refers to handover decision hysteresis parameter (Hysteresis(Inter)) of Event 2C. /2HTQ 2c2cusedNonusedNon 
  • 45. 45 Inter-Frequency Handover Strategy:2D  Event 2D: The quality of working carrier frequency is lower than a threshold.  QUsed: Refers to the measurement result of current working carrier frequency.  TUsed 2d: Refers to the absolute threshold (ThreshUsedFreq) of poor quality of working carrier frequency in Event 2D decision.  H2d: Refers to handover decision hysteresis parameter (Hysteresis(Inter)) of Event 2D. /2HTQ 2d2dUsedUsed 
  • 46. 46 Inter-Frequency Handover Strategy:2E  Event 2E: The quality of non-working carrier frequency is lower than a threshold.  QNon used: Refers to the measurement result of current non-working carrier frequency.  TNon used 2e: Refers to the absolute threshold (ThreshNoUsedFreq) of good quality of non-working carrier frequency in Event 2E decision.  H2e: Refers to handover decision hysteresis parameter (Hysteresis) of Event 2E. /2HTQ 2e2eusedNonusedNon 
  • 47. 47 Inter-Frequency Handover Strategy:2F  Event 2F: The quality of working carrier frequency is higher than a threshold.  QUsed: Refers to the measurement result of current working carrier frequency.  TUsed 2f: Refers to the absolute threshold (ThreshUsedFreq) of poor quality of working carrier frequency in Event 2F decision.  H2f: Refers to handover decision hysteresis parameter (Hysteresis(Inter)) of Event 2F /2HTQ 2f2fUsedUsed 
  • 48. 48 Inter-Frequency Handover Parameter Parameter name Measurement Priority of Neighboring Cell Abbreviated name MeasPrio Description This parameter indicates the measurement priority of the neighboring cell. The highest priority is 0, the lowest priority is 2. Range and Step [0, 1, 2] Unit N/A Default Value (note) 0
  • 49. 49 Inter-Frequency Handover Parameter Parameter name Inter-frequence Handover Tactic Abbreviated name InterHoTactic Description This parameter indicates the inter-frequency handover tactic. Range and Step 0: Algorithm Deciding 1: 2A Event Trigger 2: 2B Event Trigger 3: 2C Event Trigger Unit N/A Default Value (note) 1: 2A Event Trigger
  • 50. 50 Inter-Frequency Handover Parameter Parameter name Filter Coefficient Abbreviated name FilterCoeff Description This parameter indicates the filtering factor that UE performs the L3 filtering on the measurement results of the inter-frequency measurement. Range and Step (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 15, 17, 19) Unit N/A Default Value (note) UE Inter-frequency Event Report Parameters for CPICH Ec/No: 3 UE Inter-frequency Event Report Parameters for CPICH RSCP: 3
  • 51. 51 Inter-Frequency Handover Parameter Parameter name Absolute Threshold of the Quality of the Currently Used Frequency for 2B/2D/2F Abbreviated name ThreshUsedFreq[MAX_INTER_MEAS_EVENT] Description This parameter indicates the absolute threshold that is required to be configured for event 2b/2d/2f (used when judging the quality of the currently used frequency. MAX_INTEREAS_EVENT is the maximum number of inter- frequecy measument event which is 6. Range and Step CPICH RSCP: [-115, -25] dBm CPICH Ec/No: [-24, 0] dB Pathloss: [30, 165] dB Unit dBm /dB Default Value (note) For CPICH Ec/No, UE inter frequency event report parameter: [- 24,-13, -24,-13,-24,-5]dB For CPICH RSCP, UE inter frequency event report parameter: [- 115,-95, -115,-95,-115,-70]dB
  • 52. 52 Inter-Frequency Handover Parameter Parameter name Weight of the Currently Used Frequency for 2A/2B/2D/2F Abbreviated name Wused[MAX_INTER_MEAS_EVENT] Description This parameter is used for quality judgment for the carrier of currently used frequency, which indicates the weight of the best cell in the quality judgment and is related to the measurement quantity and the event type (only for event 2a/2b/2d/2f). MAX_INTEREAS_EVENT is the maximum number of inter-frequecy measument event which is 6. Range and Step [0.0, 2.0]step 0.1 Unit N/A Default Value (note) For CPICH Ec/No, UE inter frequency event report parameter: [0. 0, 0. 0, 0. 0,0. 0,0. 0,0. 0] For CPICH RSCP, UE inter frequency event report parameter: [0. 0, 0. 0, 0. 0,0. 0,0. 0,0. 0]
  • 53. 53 Inter-Frequency Handover Parameter Parameter name Hysteresis(dB) Abbreviated name Hysteresis[MAX_INTER_MEAS_EVENT] Description This parameter indicates the hysteresis used when judging whether to trigger the event. This parameter makes it different between the status to trigger an event and the status to leave the event, so as to avoid the trigger status change due to very small change. Different events are configured separately and can be configured with different values. MAX_INTEREAS_EVENT is the maximum number of inter- frequecy measument event which is 6. Range and Step (0, …,14.5)dB step 0.5dB Unit dB Default Value (note) For CPICH Ec/No, UE inter frequency event report parameter: [4,4,4,4,4,4]dB For CPICH RSCP, UE inter frequency event report parameter: [4,4,4,4,4,4]dB
  • 54. 54 Inter-Frequency Handover Parameter Parameter name Time To Trigger(ms) Abbreviated name TrigTime[MAX_INTER_MEAS_EVENT] Description This parameter indicates the time difference between having detected the event generation and reporting the event. Only when the event generation is detected and still meets all requirements of event triggering after Time to trigger, the event can be triggered and reported. The larger the value is, the stricter the judgment is for the event to be triggered. The parameter should be set according to the actual requirements. Sometimes, if it is set too large, the quality of calls may decrease. MAX_INTEREAS_EVENT is the maximum number of inter-frequecy measument event which is 6. Range and Step (0, 10, 20, 40, 60, 80, 100, 120, 160, 200, 240, 320, 640, 1280, 2560, 5000)ms Unit Ms Default Value (note) For CPICH Ec/No, UE inter frequency event report parameter: [100,100,100,640,100,640] For CPICH RSCP, UE inter frequency event report parameter: [100,100,100,640,100,640]
  • 55. 55 Inter-Frequency Handover Parameter Parameter name Absolute Threshold of the Quality of the Non-used Frequency for 2B/2C/2E Abbreviated name ThreshNoUsedFreq[MAX_INTER_MEAS_EVENT] Description This parameter indicates the absolute threshold that is required to be configured for event 2a/2b/2c/2e (used when judging the quality of the noT used frequency). MAX_INTEREAS_EVENT is the maximum number of inter-frequecy measument event which is 6. Range and Step CPICH RSCP: [-115, 25]dBm step 1dBm CPICH Ec/No: [-24, 0]dB step 1dB Unit dBm /dB Default Value (note) For CPICH Ec/No, UE inter frequency event report parameter: [-24,- 5,-5,-24,-13,-24]dB For CPICH RSCP, UE inter frequency event report parameter: [- 115,-50,-50,-115,-95,-115]dBm
  • 56. 56 Inter-Frequency Handover Parameter Parameter name Weight of the Non-used Frequency for 2A/2B/2C/2E Abbreviated name WNoUsed[MAX_INTER_MEAS_EVENT] Description This parameter is used when judging the quality of the cells of not used frequencies. This parameter indicates the weight of the best cell in the quality judgment (only for event 2a/2b/2c/2e). MAX_INTEREAS_EVENT is the maximum number of inter- frequecy measument event which is 6. Range and Step [0.0, 2.0] step 0.1 Unit N/A Default Value (note) For CPICH Ec/No, UE inter frequency event report parameter: [0. 0, 0. 0, 0. 0,0. 0,0. 0,0. 0] For CPICH RSCP, UE inter frequency event report parameter: [0. 0, 0. 0, 0. 0,0. 0,0. 0,0. 0]
  • 57. 57 Inter-Frequency Handover Parameter Parameter name Share Cover Indication Abbreviated name ShareCover Description This parameter describes the neighboring relationship of the serving cell and neighboring cell. Range and Step 0: Neighbor 1: Overlap 2: Covers 3: Contained in Unit N/A Default Value (note) 0: Neighbor
  • 58. 58 Inter-Frequency Handover Parameter Parameter name Inter-frequency Handover Method Abbreviated name InterHoMth Description This paramerer indicates the inter handover method is periodical method or event method. Range and Step 0: Periodical method 1: Event method Unit N/A Default Value (note) 1: Event method
  • 59. 59 Inter-Frequency Handover Parameter Parameter name UTRAN Measurement Quantity for Inter-frequency and Inter-RAT measurements Abbreviated name NonIntraMeasQuan Description This parameter indicates UTRAN measurement quantity for inter- frequency and inter-RAT measurements. Range and Step 0: Ec/No 1: RSCP 2: Ec/No and RSCP Unit N/A Default Value (note) 1: RSCP
  • 60. 60 Contents  Intra-Frequency Handover Strategy  Inter-Frequency Handover Strategy  Inter-RAT Handover Strategy
  • 61. 61 Inter-RAT Handover Sample
  • 62. 62 Inter-RAT Handover Strategy  Inter-RAT handover means that an UE switches from one radio access system to another, and specifically, from a UTRAN access system to a GERAN system. (If an UE switches from a GERAN system to a UTRAN system, the GERAN system policy is used.) Inter-RAT handover can be measurement-based handover between systems or blind handover based on shared coverage or inclusion.  The prerequisite of measured-based Inter-RAT handover is that the UE measures the quality of the Inter-RAT neighboring cells. In WCDMA system, for Inter-RAT measurement in CELL_DCH state, the UE must enable compressed mode for Inter-RAT measurement unless it has dual receivers. In addition, regarding the influences of the compressed mode on the system and UE, Inter- RAT measurement is enabled only when the current UTRAN system has poor radio quality . When receiving Inter-RAT measurement result reported by the UE, the RNC makes Inter-RAT handover decision and switches the UE to the target cell of the GERAN system specified in the measurement result.
  • 63. 63 Inter-RAT Handover Strategy:Inter-RAT Measurement  QUTRAN :indicates the measurement result of the currently used UTRAN frequency (dB for Ec/No; dBm for RSCP).  MUTRAN : indicates the measured physical value of the currently used UTRAN frequency (ratio for Ec/No; mV for RSCP).  Mi : indicates the measured physical value of cell I in the current active set.  NA : indicates the number of the cells (excluding best cells) in an active set.  MBest : indicates the measurement result of the best cells in an active set.  W : indicates the weight of the best cells in an active set in the frequency quality evaluation of the currently used UTRAN. Best N 1i iUTRANUTRAN LogM10W)(1MLog10WLogM10Q A        
  • 64. 64 Inter-RAT Handover Strategy:Inter-RAT Measurement  Inter-RAT measurement is to measure the Inter-RAT cells. In the case of Inter-RAT measurement, the measured quantity of the UTRAN network can be triggered based on the measured quantity of Ec/N0 or RSCP. The specific parameter used is controlled by the NonIntraMeasQuan parameter. The measured quantity of Inter-RAT measurement depends on the systems to be measured. For the GERAN, the measured quantity is RSSI. At present, Inter-RAT measurement supports only the handover modes reported through events.  ZTE UMTS support event 3A、3C for inter-RAT handover and uses 2D and 2F events as the criterions for evaluating the signal quality of the current frequency, If the UE reports a 2D event, that is, the current carrier is in poor signal quality, and no inter-frequency neighboring cells exist, or the UE reports a 2E event after inter-frequency measurement is started (that is, the signal quality of the measured inter-frequency neighboring cell is also poor), the RNC tries to initiate Inter-RAT blind handover or start Inter-RAT measurement 3A or 3C event to the UE based on the GSM neighboring cell cover.
  • 65. 65 Inter-RAT Handover Strategy:3A  3A: The currently used UTRAN carrier quality is lower than a threshold, and the quality of other radio systems is higher than a threshold. It is used for decision of Inter-RAT handover.  QUsed :indicates the estimated quality of the used frequency of the UTRAN.  TUsed :indicates the absolute threshold (Thresh[MAX_RAT_MEAS_EVENT]) of the currently used frequency difference.  H3a: is the hysteresis parameter (Hysteresis[MAX_RAT_MEAS_EVENT] (Rat)) for 3A event decision.  MOther RAT :is the quality measurement result of other systems.  CIOOther RAT: is the quality offset of other system cells (CellIndivOffset(gsmRelation).  TOther RAT: is the absolute threshold of other systems (ThreshSys[MAX_RAT_MEAS_EVENT]) /2HTQ 3aUsedUsed  /2HTCIOM 3aRATOtherRATOtherRATOther and :
  • 66. 66 Inter-RAT Handover Strategy:3C  3C: The quality of other radio systems is higher than a threshold. It can be used for Inter-RAT handover decision.  MOther RAT : the quality measurement result of other systems.  CIOOther RAT : the quality offset of other system cells (CellIndivOffset(gsmRelation).  TOther RAT : the absolute threshold of other systems (ThreshSys[MAX_RAT_MEAS_EVENT]).  H3c : the hysteresis parameter (Hysteresis[MAX_RAT_MEAS_EVENT] (Rat)) for 3C event decision. : /2HTCIOM 3cRATOtherRATOtherRATOther 
  • 67. 67 Inter-RAT Handover Parameter Parameter name Measurement Priority of Neighboring GSM Cell Abbreviated name MeasPrio Description This parameter indicates the measurement priority of the neighboring cell. The highest priority is 0, the lowest priority is 2. Range and Step [0, 2] Unit N/A Default Value (note) 0
  • 68. 68 Inter-RAT Handover Parameter Parameter name Inter-Rat Handover Tactic Abbreviated name RatHoTactic Description This parameter indicates the inter-RAT handover tactic. Range and Step 0: Algorithm Deciding 1: 3A Event Trigger 2: 3C Event Trigger Unit N/A Default Value (note) 1: 3A Event Trigger
  • 69. 69 Inter-RAT Handover Parameter Parameter name Absolute Threshold of the Quality of UTRAN Cell for 3A Abbreviated name Thresh[MAX_RAT_MEAS_EVENT] Description This parameter indicates the absolute threshold of the UTRAN cell quality that UE uses to judge event 3a. The range and Unit of the parameter relate to the measurement quantity of UTRAN system. MAX_RAT_MEAS_EVENT is the maximum number of inter-RAT measurement events which takes the value of 4. Range and Step CPICH RSCP:[-115, -25] dBm step 1dBm CPICH Ec/No: [-24, 0] dB step 1dB Unit dBm/ dB Default Value (note) For own system CPICH Ec/No, UE event report parameter: [-6, -24,- 24,-24] For own system CPICH RSCP, UE event report parameter: [-95, - 115,-115,-115]
  • 70. 70 Inter-RAT Handover Parameter Parameter name Weight of the UTRAN System for 3A Abbreviated name W[MAX_RAT_MEAS_EVENT] Description This parameter is used when judging the quality of the UTRAN system in inter-RAT measurement, which indicates the weight of the best cell in the quality judgment (only for event 3a). MAX_RAT_MEAS_EVENT is the maximum number of inter-RAT measurement events which takes the value of 4. Range and Step [0.0, 2.0] step 0.1 Unit N/A Default Value (note) For own system CPICH Ec/No, UE event report parameter: [0, -, -, -] For own system CPICH RSCP, UE event report parameter: [0, -, -, -]
  • 71. 71 Inter-RAT Handover Parameter Parameter name Absolute Threshold of the Quality of Other RAT for 3A/3B/3C Abbreviated name ThreshSys[MAX_RAT_MEAS_EVENT] Description This parameter indicates the absolute threshold used when judging the quality of other RAT configured for event 3a/3b/3c. The value range and Unit of this parameter are related to the measurement quantity of other system, at present the measurement quantity can only be GSM Carrier RSSI of the GSM system, which corresponds to the CPICH RSCP of UTRAN system, so the value range and Unit of this parameter correspond to the CPICH RSCP. MAX_RAT_MEAS_EVENT is the maximum number of inter-RAT measurement events which takes the value of 4. Range and Step CPICH RSCP: [-115, -25]dBm step 1dBm CPICH Ec/No: [-24, 0] dB step 1dB Unit dBm/ dB Default Value (note) [-90, -95, -95, -115]dBm
  • 72. 72 Inter-RAT Handover Parameter Parameter name Hystersis(dB) Abbreviated name Hysteresis[MAX_RAT_MEAS_EVENT] Description This parameter indicates the hysteresis used when judging whether to trigger the event. This parameter makes it different between the status to trigger an event and the status to leave the event, so as to avoid the trigger status change due to very small change. The larger the value is, the larger the difference between the status to trigger the event and the status to leave the event will be. This parameter is related to the measurement quantity and the event type. Different events are configured separately and can be configured with different hysteresis MAX_RAT_MEAS_EVENT is the maximum number of inter-RAT measurement events which takes the value of 4. Range and Step (0, …, 7.5)dB step 0.5dB Unit dB Default Value (note) For own system CPICH Ec/No, UE event report parameter: [4,4,2,4]dB For own system CPICH RSCP, UE event report parameter: [4,4,4,4]dB
  • 73. 73 Inter-RAT Handover Parameter Parameter name Time To Trigger(ms) Abbreviated name TrigTime[MAX_RAT_MEAS_EVENT] Description This parameter indicates the time difference between having detected the event generation and reporting the event. Only when the event generation is detected and still meets all requirements of event triggering after Time to trigger, the event can be triggered and reported. The larger the value is, the stricter the judgment is for the event to be triggered. The parameter should be set according to the actual requirements. Sometimes, if it is set too large, the quality of calls may decrease. MAX_RAT_MEAS_EVENT is the maximum number of inter-RAT measurement events which takes the value of 4. Range and Step (0, 10, 20, 40, 60, 80, 100, 120, 160, 200, 240, 320, 640, 1280, 2560, 5000)ms Unit Ms Default Value (note) For own system CPICH Ec/No, UE event report parameter: [100,100,100,100]ms For own system CPICH RSCP, UE event report parameter: [100,100,100,100]ms
  • 74. 74 Inter-RAT Handover Parameter Parameter name UTRAN Filter Coefficient(Rat) Abbreviated name FilterCoeff(Rat) Description This parameter indicates the filtering factor of UTRAN when UE performs the L3 filtering on the measurement results of the inter-RAT measurement. Range and Step (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 15, 17, 19) Unit N/A Default Value (note) UE Event Report Parameters for Own System CPICH Ec/No: 3 UE Event Report Parameters for Own System CPICH RSCP: 3
  • 75. 75 Inter-RAT Handover Parameter Parameter name GSM Filter Coefficient(Rat) Abbreviated name GsmFilterCoeff Description This parameter indicates the filtering factor of GSM when UE performs the L3 filtering on the measurement results of the inter-RAT measurement. Range and Step (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 15, 17, 19) Unit N/A Default Value (note) For own system CPICH Ec/No, UE event report parameter: 3 For own system CPICH RSCP, UE event report parameter: 3
  • 76. 76 Inter-RAT Handover Parameter Parameter name GSM BSIC Verification Required Indicatior Abbreviated name BSICVeriReq Description This parameter indicates whether to confirm the BSIC of GSM cells when performing the Inter-RAT measurement. BSIC = NCC (Network Color Code) + BCC (Base Color Code). BSIC can be used to identify the GSM cells. If the value is ‘Not Required ‘, UE does not confirm the BSIC when measuring the GSM cells. If the value is ‘Required ‘, UE confirms the BSIC when measuring the GSM cells, and then queue the confirmed BSIC cells according to the measurement results. In each measurement period, re-confirm and measure the BSIC in the order of the measurement results, from good to bad. Range and Step 0: Require Confirm 1: Not Required Confirm Unit N/A Default Value (note) UE Event Report Parameters for Own System CPICH Ec/No: Required UE Event Report Parameters for Own System CPICH RSCP: Required
  • 77. 77 Inter-RAT Handover Parameter Parameter name UTRAN Quality Estimation Reporting Indicator Abbreviated name UtranEstQual Description This parameter indicates whether the report of the estimation quality of UTRAN system is requested or not. Range and Step 0: Not Report (False) 1: Report (True) Unit N/A Default Value (note) For own system CPICH Ec/No, UE event report parameter: Not Report For own system CPICH RSCP, UE event report parameter: Not Report
  • 78. 78 Inter-RAT Handover Parameter Parameter name GSM Carrier RSSI Reporting Indicator Abbreviated name GsmCarrRSSIInd Description This parameter indicates whether the report of RSSI of the GSM cells is requested or not. Since the measurement quantity of the GSM cell is only GSM Carrier RSSI, in inter-RAT measurement Event Reporting Criteria, there is no need to report this parameter when measuring the GSM cell and performing the Inter-RAT handover. In the periodical reporting criteria, GSM carrier RSSI report is required. Range and Step 0: Not Report (False) 1: Report (True) Unit N/A Default Value (note) For own system CPICH Ec/No, UE event report parameter: Report For own system CPICH RSCP, UE event report parameter: Report
  • 79. 79 Inter-RAT Handover Parameter Parameter name Cell individual offset(gsmRelation) Abbreviated name CellIndivOffset(gsmRelation) Description An offset is allocated for each cell being monitored. The offset can be positive or negative. Before the UE judges whether an event occurs, adds the offset to the measurement result. If the PCPICH uses a positive offset, the UE sends the measurement report just like PCPICH is x dB better than the actual case. Or, if the PCPICH uses a negative offset, the PCPICH report is limited. When the cell individual offset is used, the corresponding cell is possibly (at least temporarily) the target cell of the handover or removed from the active set. Range and Step OMCR: [-10, 10]dB step 0. 5 RNC: D= (P+10) *2, [0, 40] Unit dB Default Value (note) 0dB
  • 80. 80 Inter-RAT Handover Parameter Parameter name UTRAN Measurement Quantity for Inter-frequency and Inter-RAT Measurements Abbreviated name NonIntraMeasQuan Description This parameter indicates UTRAN measurement quantity for inter- frequency and inter-RAT measurements. Range and Step 0: Ec/No 1: RSCP 2: Ec/No and RSCP Unit N/A Default Value (note) 1: RSCP
  • 81. 81 Inter-RAT Handover Parameter Parameter name Share Cover Indication Abbreviated name GsmShareCover Description This parameter describes the neighboring relationship of the serving cell and Gsm neighboring cell. Range and Step 0: Neighbor 1: Overlap 2: Covers 3: Contained in Unit N/A Default Value (note) 0: Neighbor
  • 82. 82 Inter-RAT Handover Parameter: for True Tower Default configuration True Tower Absolute Threshold of the Quality of the Currently Used Frequency for 2D -95dbm -85dbm Absolute Threshold of the Quality of UTRAN Cell for 3A -95dbm -85dbm  The handover parameters in TRUE network are default configuration except the follow adjustment.  In the hot spot area TRUE TOWER, to make sure that users has good experience (data rate>=400kbps) in HSPA coverage, the HSPA coverage should not be too large. ZTE suggests to handover to GSM at the edge of HSPA coverage. Some parameters are recommend to be changed:
  • 83. 83 Intra-Frequency Handover Parameter Summary Parameter Name Default Value TRUE Value Measurement Priority of Neighboring Cell 0 0 Detected Set Handover Switch Open Open Reporting Range Constant for Event 1A 3db 3db Reporting Range Constant for Event 1B 5db 5db Weight for Event 1A 0 0 Weight for Event 1B 0 0 Hysteresis 1A 0db 0db Hysteresis 1B 0db 0db Hysteresis 1C 4db 4db Hysteresis 1D 4db 4db Filter Coefficient 2db 2db Time To Trigger 1A 200ms 200ms Time To Trigger 1B 640ms 640ms
  • 84. 84 Intra-Frequency Handover Parameter Summary Parameter Name Default Value TRUE Value Time To Trigger 1C 320ms 320ms Time To Trigger 1D 320ms 320ms Amount of Reporting in Period Report Criteria Infinity Infinity Reporting Interval in Period Report Criteria 1s 1s Cell Individual Offset (UtranCell) 0db 0db Cell Individual Offset (UtranRelation) 0db 0db Reporting Deactivation Threshold for Event 1A 2 2 Replacement Activation Threshold for Event 1C 3 3 UTRAN Measurement Quantity for Intra-frequency Measurements Ec/No Ec/No CPICH Ec/No Reporting Indicator TRUE TRUE CPICH RSCP Reporting Indicator TRUE TRUE Pathloss reporting indicator FALSE FALSE Event Number of Intra-frequency Measurement 7 7 Maximum Number of Cells Within DCH Active Set 3 3 Soft Handover Method Event method Event method
  • 85. 85 Inter-Frequency Handover Parameter Summary Parameter Name Default Value TRUE Value Measurement Priority of Neighboring Cell 0 0 Inter-frequence Handover Tactic 2A Event Trigger 2A Event Trigger Filter Coefficient 3 3 Absolute Threshold of the Quality of the Currently Used Frequency for 2B -95db -95db Absolute Threshold of the Quality of the Currently Used Frequency for 2D -95db -95db (except -85 for True Tower and CP tower) Absolute Threshold of the Quality of the Currently Used Frequency for 2F -70db -70db Weight of the Currently Used Frequency for 2A 0 0 Weight of the Currently Used Frequency for 2B 0 0 Weight of the Currently Used Frequency for 2D 0 0 Weight of the Currently Used Frequency for 2F 0 0 Hysteresis 2A 4db 4db Hysteresis 2B 4db 4db Hysteresis 2C 4db 4db Hysteresis 2D 4db 4db Hysteresis 2E 4db 4db Hysteresis 2F 4db 4db
  • 86. 86 Inter-Frequency Handover Parameter Summary Parameter Name Default Value TRUE Value Time To Trigger 2A 100ms 100ms Time To Trigger 2B 100ms 100ms Time To Trigger 2C 100ms 100ms Time To Trigger 2D 640ms 640ms Time To Trigger 2E 100ms 100ms Time To Trigger 2F 640ms 640ms Absolute Threshold of the Quality of the Non-used Frequency for 2B -50dbm -50dbm Absolute Threshold of the Quality of the Non-used Frequency for 2C -50dbm -50dbm Absolute Threshold of the Quality of the Non-used Frequency for 2E -95dbm -95dbm Weight of the Non-used Frequency for 2A 0 0 Weight of the Non-used Frequency for 2B 0 0 Weight of the Non-used Frequency for 2C 0 0 Weight of the Non-used Frequency for 2E 0 0 Share Cover Indication Neighbor Neighbor Inter-frequency Handover Method Event method Event method UTRAN Measurement Quantity for Inter-frequency and Inter-RAT measurements RSCP RSCP
  • 87. 87 Intra-RAT Handover Parameter Summary Parameter Name Default Value TRUE Value Measurement Priority of Neighboring GSM Cell 0 0 Inter-Rat Handover Tactic 3A Event Trigger 3A Event Trigger Absolute Threshold of the Quality of UTRAN Cell for 3A -95dbm -95db (except -85 for True Tower and CP tower) Weight of the UTRAN System for 3A 0 0 Absolute Threshold of the Quality of Other RAT for 3A -90dbm -90dbm Absolute Threshold of the Quality of Other RAT for 3B -95dbm -95dbm Absolute Threshold of the Quality of Other RAT for 3C -95dbm -95dbm Hystersis 3A 4db 4db Hystersis 3B 4db 4db Hystersis 3C 4db 4db
  • 88. 88 Inter-RAT Handover Parameter Summary Parameter Name Default Value TRUE Value Time To Trigger 3A 100ms 100ms Time To Trigger 3B 100ms 100ms Time To Trigger 3C 100ms 100ms UTRAN Filter Coefficient(Rat) 3 3 GSM Filter Coefficient(Rat) 3 3 GSM BSIC Verification Required Indicatior Required Required UTRAN Quality Estimation Reporting Indicator Not Report Not Report GSM Carrier RSSI Reporting Indicator Report Report Cell individual offset(gsmRelation) 0db 0db UTRAN Measurement Quantity for Inter-frequency and Inter-RAT Measurements RSCP RSCP Share Cover Indication Neighbor Neighbor

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