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Thread: Cell Reselection Parameters: Cell Reselection Parameters

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    Cell Reselection Parameters: Cell Reselection Parameters

    Huawei WCDMA RNO Parameters Optimization
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    Slide 1: Parameter Optimization

    Review : Review Parameter optimization is an important step after RF Optimization . Parameter optimization improves service quality and utilization of network resources.

    Review: Review

    Objectives: Objectives Understand the process of parameter optimization Master the contents of parameter optimization Upon completion of this course, you can:

    Contents: Contents Parameter optimization procedure Parameter optimization contents

    Parameter Optimization Process: Parameter Optimization Process

    Data Input and Find Problems: Data Input and Find Problems Find problems from the input data, such as: Low success rate of call setup Low success rate of handover High rate of call drop

    Verify Parameter Problems: Verify Parameter Problems

    Parameter Classification: Parameter Classification Mobile Management Parameters Power Control Parameters Power Configuration Parameters Load Control Parameters Other Parameters

    Determine Parameter Values : Determine Parameter Values List the form for changing parameters (original parameter values vs. new parameter values) List MML commands for changing parameters Note: Maybe some tradeoff considerations need to be considered to assure the maximal improvement in the whole view such as “coverage and capacity”,“ fast and stable”, “improvement and risk”, “cost (or efforts) and gain”.

    Impact: Impact Impact on customer service and other networks Impact on OMC (efforts, maintenance)

    Prepare Test Plan and Change Parameters: Prepare Test Plan and Change Parameters Prepare test schedule, routes, tools and be ready to get Information. Change parameters and make records.

    Slide 13: Course Contents Parameter optimization Procedure Parameter optimization Contents



    Parameter Optimization Contents: Parameter Optimization Contents Mobile Management parameter optimization Power Control parameter optimization Power Configuration parameter optimization Load Control parameter optimization Note: There are too many parameters to introduce. Only some parameters about network optimization are mentioned here and maybe more parameters need to be added in the future.

    Mobile Management Parameter Optimization: Mobile Management Parameter Optimization Cell Selection & Reselection The changing of cell on which UE camped in idle mode or in Cell FACH, Cell PCH, URA PCH states. That assures UE camping the most suitable cell, receiving system information and establishing an RRC connection on a best serving cell. Handover The changing of cells with which UE connected in DCH mode. That assures seamless coverage and load balancing.

    Cell Selection & Reselection Procedure: Cell Selection & Reselection Procedure

    Cell Selection Criteria (S Criteria): Cell Selection Criteria (S Criteria) The cell selection criterion S is fulfilled when: Where: When a UE wants to select a UMTS cell, the cell must satisfy S criterion.

    Cell Selection Parameters: Cell Selection Parameters

    Cell Re-selection Measure Condition : Cell Re-selection Measure Condition Use Squal for FDD cells and Srxlev for TDD for Sx 1. If Sx > Sintrasearch, UE need not perform intra-frequency measurements. If Sx <= Sintrasearch, perform intra-frequency measurements. If Sintrasearch, is not sent for serving cell, perform intra-frequency measurements. 2. If Sx > Sintersearch, UE need not perform inter-frequency measurements. If Sx <= Sintersearch, perform inter-frequency measurements. If Sintersearch, is not sent for serving cell, perform inter-frequency measurements. 3. If Sx > SsearchRAT m , UE need not perform measurements on cells of RAT“ m". If Sx <= SsearchRAT m , perform measurements on cells of RAT "m". If SsearchRAT m, is not sent for serving cell, perform measurements on cells of RAT " m " .

    Cell Reselection Criteria (R Criteria): Cell Reselection Criteria (R Criteria) All cells should satisfy S Criteria. Select the Cell with the highest R value using the following method to compute. The cells shall be ranked according to the R criteria specified above, deriving Qmeas,n and Qmeas,s and calculating the R values using CPICH RSCP, P-CCPCH RSCP and the averaged received signal level for FDD, TDD and GSM cells, respectively. The offset Qoffset1s,n is used for Qoffsets,n to calculate Rn, the hysteresis Qhyst1s is used for Qhysts to calculate Rs. If an FDD cell is ranked as the best cell and the quality measure for cell selection and re-selection is set to CPICH Ec/No, the UE shall perform a second ranking of the FDD cells according to the R criteria specified above, but using the measurement quantity CPICH Ec/No for deriving the Qmeas,n and Qmeas,s and calculating the R values of the FDD cells. T he offset Qoffset2s,n is used for Qoffsets,n to calculate Rn, the hysteresis Qhyst2s is used for Qhysts to calculate Rs. Following this second ranking, the UE shall perform cell re-selection to the best ranked FDD cell. In all cases, the UE shall reselect the new cell, only if the following conditions are met: - the new cell is better ranked than the serving cell during a time interval Treselection. - more than 1 second has elapsed since the UE camped on the current serving cell.

    Slide 21: Cell Reselection Parameters

    Cell Reselection Parameters: Cell Reselection Parameters

    Cell Reselection from GSM to UMTS: Cell Reselection from GSM to UMTS If the 3G Cell Reselection list includes UTRAN frequencies, the MS shall, at least every 5 s update the value RLA_C for the serving cell and each of the at least 6 strongest non-serving GSM cells. The MS shall then reselect a suitable (see TS 25.304) UTRAN cell if its measured RSCP value exceeds the value of RLA_C for the serving cell and all of the suitable (see 3GPP TS 03.22) non-serving GSM cells by the value XXX_Qoffset for a period of 5 seconds and, for FDD, the UTRAN cells measured Ec/No value is equal or greater than the value FDD_Qmin. In case of a cell reselection occurring within the previous 15 seconds, XXX_Qoffset is increased by 5 dB. where Ec/No and RSCP are the measured quantities. FDD_Qmin and XXX_Qoffset are broadcast on BCCH of the serving cell. XXX indicates other radio access technology/mode. Note:The parameters required to determine if the UTRAN cell is suitable are broadcast on BCCH of the UTRAN cell. An MS may start reselection towards the UTRAN cell before decoding the BCCH of the UTRAN cell, leading to a short interruption of service if the UTRAN cell is not suitable. Cell reselection to UTRAN shall not occur within 5 seconds after the MS has reselected a GSM cell from an UTRAN cell if a suitable GSM cell can be found. If more than one UTRAN cell fulfils the above criteria, the MS shall select the cell with the greatest RSCP value.

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    100000 gooooooooooooooooooooooooooooooooooooooooooooooooo ooooooooooooooooooooooooo


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    Thanks very wellllllllllllllllllllllllllllllllllllllllllllllll llllllllllllllllllllllllllllllllllllllllllllllllll llllllllllll


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