NSN -3G - Most Tuned Parameters

HSDPA :

Code Congetion :

1- WCEL Parameters

DPCHOverHSPDSCHThreshold (NRT DPCH over HS-PDSCH code offset) from 5 to 0 This parameter defines the number of allocated HS-PDSCH codes that are not allowed to pre-empt by NRT DPCH in the case NRT DPCH code congestion. The value of the parameter is an offset from the maximum allowed number of HS-PDSCH codes.

2-

HSPDSCHMarginSF128 (HS-PDSCH code upgrade margin for SF128 codes) from 0 to 1 or 8 The parameter defines the required number of free SF128 channelisation codes left for DPCHs. The number of free DPCH codes after the HS-PDSCH code upgrade has to be equal or higher than the parameter value, otherwise the HS-PDSCH code upgrade is not allowed. Also, if the number of free DPCH codes is lower than the value of the parameter, periodical HS-PDSCH code downgrade can be initiated.Dl Congestion :

Special Case : Very High UL Code congestion (HSDPA 3.2 Meg will utilize ~34% of code, 7.2 will utilize ~68% of code ): abcdef-

HSDPA16KBPSReturnChannel=enabled

Reduce SHO overhead Give Sw and HW Restart of BTS in case there is bad CQI good one is 26 or 25 HSUPA turned off (In fact that turned on HSUPA use 60 UL CE permanent

Inactivity timer for downlink DCH to be tuned but will not effect because reserved IP in the core UL SIR target with HS-DPCCH - DPDCH SF 32 to be tuned from 1 to -10 or UL SIR target with HSDPCCH - DPDCH SF 64 from 7,5 to `1

g- UL BE INITIAL BIT RATE from 64 to 32kbit/sec

1-PtxCellMax (Cell maximum

transmission power) from 43 dbm to 46 dbm :

This parameter defines the maximum transmission power of the cell. The maximum transmission power is the maximum value for the linear sum of the power of all downlink physical channels that is allowed to be used in a cell. The maximum transmission power of the cell is the minimum of the two parameters: PtxCellMax and MaxDLPowerCapability (the maximum BTS power capability). The RNC signals the BTS the minimum value as the maximum transmission power in Maximum Transmission Power IE (TS 25.433). The RNC uses the minimum value as the maximum transmission power of the cell.

2-PtxTargetHSDPA

(Target for transmitted non-HSDPA power) from 385 to 400

then 430 then 450: Parameter defines the target scheduling threshold for HSDPA power allocation. It is applicable to the HSDPA static resource allocation in RNC and ignored in the case of HSDPA dynamic resource allocation. Depending on the setting of the parameter HSDPAPriority, either the total transmitted carrier power or the total non-controllable transmitted power has to be below or equal to PtxTargetHSDPA before the first HS-DSCH MAC-d flow can be allocated in the cell. If at least one HS-DSCH MAC-d flow is allocated in the cell, PtxTargetHSDPA is used instead of PtxTarget as a target of PtxnonHSDPA in NRT DCH scheduling In DL Allocation :

PtxTargetPSAdjustPeriod (DCH PS target adjust period for dyn HSDPA pwr alloc) from 5 to 10 This parameter defines the adjustment period - in terms of PtxTotal/PtxNonHSPA reporting periods - of the target level for DCH packet scheduling (PtxTargetPS) when one or more MAC-d flows is/are set up in the cell when HSDPA dynamic resource allocation is used in the cell. Conditions to adjust PtxTargetPS are checked every nth received measurement report from the BTS, where n is defined by this parameter.

I would like to share with you the most tuned parameters in PS of 3G in NSN :

Dl Power Congestion : DeltaPrxMaxDown (Maximum uplink power decrease in packet scheduling) from 6 dB to 8dB Description Defines the maximum received uplink power decrease in a cell, used when bit rates are decreased by the packet scheduler, relative to PrxTot

MinAllowedBitRateDL (Minimum allowed bit rate in downlink) from 32 to 8 (or 64 rarely ) The parameter defines the minimum allowed bit rate in the downlink that PS can downgrade to the NCR DCH bit rate in congestion situations. The allocated bit rate corresponds to the highest bit rate in the TFS from which the TFCS is constructed. Note: If the maximum bit rate of the RAB is below the value of the minimum allowed or initial bit rate parameter, it is allowed to schedule a lower NRT DCH bit rate. The maximum bit rate of the RAB is used as a new minimum or initial bit rate for the RRC connection in question

Up-Link Power Congestion :

DeltaPrxMaxDown (Maximum uplink power decrease in packet scheduling) from 4dB to 15 dB Defines the maximum received uplink power decrease in a cell, used when bit rates are decreased by the packet scheduler, relative to PrxTotal.

MinAllowedBitRateUL (Minimum allowed bit rate in uplink) from 32 to 8 The parameter defines the minimum allowed bit rate in the uplink that PS can downgrade to NRT DCH bit rate in congestion situations. The allocated bit rate corresponds to the highest bit rate in the TFS from which the TFCS is constructed. Note: If the maximum bit rate of the RAB is below the value of the minimum allowed bit rate or initial bit rate (InitialBitRateUL), it is allowed to schedule a lower NRT DCH bit rate. The maximum bit rate of the RAB is used as a new minimum allowed bit rate or initial bit rate for the RRC connection in question. The Admision Control parameters will be sent later