HS-PDSCH Power Allocation Static Power Allocation Dynamic Power Allocation • PHSDPA ≤ PtxMaxHSDPA allocated PHSDPA ≤ min(PtxMaxHSDPA, PtxCellMax)- power to R99 DCH & DL control channels • • Fixed load target PtxTargetHSDPA Fixed overload threshold for R99 PtxTargetHSDPA + PtxOffsetHSDPA In case of overload HSDPA might be released immediately Priorities distinguish between R99 & HSDPA users only Dynamically adjusted load target PtxTargetPS Overload threshold for R99 goes parallel to load target: PtxTargetPS + PtxOffset In case of overload HSDPA power might be reduced, but usually service not released immediately Priorities distinguish between interactive & background users as well • • • PtxMaxHSDPA Maximum allowed HSDPA power WCEL; 0..50 dBm; 0.1 dB; 43 dBm PtxTargetHSDPA Target for transmitted non-HSDPA power WCEL; -10..50 dBm; 0.1 dB; 38.5 dBm PtxOffsetHSDPA Offset for transmitted non-HSDPA power WCEL; 0..6 dB; = 0.1 dB; 0.8 dB 59 © Nokia Siemens Networks RN31679EN40GLA1 HSDPADynamicResourceAllocation HSDPA Dynamic Resource Allocation RNFC; 0 = disabled; 1 = enabled PtxCellMax Cell maximum transmission power WCEL; 0 .. 50 dBm; 0.1 dB; 43 dBm PtxOffset Offset for transmitted power WCEL; 0 .. 6 dB; 0.1 dB; 1 dB Dynamic HS-PDSCH Power Allocation (1/7) • BTS may allocate all unused DL power up to maximum cell power • all power available after DCH traffic, HSUPA control & common channels can be used for HSDPA PtxCellMax PtxMax = min (PtxCellMax, MaxDLPowerCapability) Cell maximum transmission power 0..50 dBm; 0.1 dB; 43 dBm PtxHSDPA PtxNRT PtxNonHSDPA PtxNC MaxDLPowerCapability: 0..50 dBm; 0.1 dB; 60 © Nokia Siemens Networks RN31679EN40GLA1 Dynamic HS-PDSCH Power Allocation (2/7) No active HSDPA users • NRT DCH scheduling to – – PtxTarget + PtxOffset if HS-RACH isn’t set up in the cell PtxTargetPS if HS-RACH is set up in the cell • RT DCH admission to PtxTarget HSDPA active No HSDPA users Active HSDPA users • NRT DCH scheduling to PtxTargetPS • RT DCH admission to – – PtxTarget no RT HS-SDCH PtxTargetTot at least 1 RT HS-DSCH No HSDPA users PtxMax PtxTotal PtxHSDPA 3 PtxTarget + PtxOffset 1 PtxTargetPS 2 PtxNRT PtxNonHSDPA PtxNC 61 © Nokia Siemens Networks RN31679EN40GLA1 Dynamic HS-PDSCH Power Allocation (3/7) • Adjustable load target PtxTargetPS – PtxTargetPSMin (minimum value) – PtxTargetPSMax (maximum value, also initial value, HS-RACH is set up in the cell) – PtxTargetPSMaxHSRACH (maximum value used if HS-RACH is set up in the cell) PtxMax PtxTargetPSMax PtxHSDPA -10..50 dBm; 0.1 dB; 40 dBm PtxTargetPSMax (40 dBm) PtxNRT PtxTargetPS PtxTargetPSMin (36 dBm) PtxNonHSDPA PtxNC PtxTargetPSMin -10..50 dBm; 0.1 dB; 36 dBm PtxTargetPSMin Min DCH PS target for dynamic HSDPA pwr allocation WCEL; -10..50 dBm; 0.1 dB; 36 dBm PtxTargetPSMax Max DCH PS target for dynamic HSDPA pwr allocation WCEL; -10..50 dBm; 0.1 dB; 40 dBm PtxTargetPSMaxHSRACH Max DCH target power level with HS-RACH for dynamic HSDPA pwr allocation WCEL; 0..40 dBm; 0.1 dB; 32767 dBm (Value set by the PtxTargetPSMax parameter used when the HS-RACH has been setup in the cell) 62 © Nokia Siemens Networks RN31679EN40GLA1 Dynamic Load Target (4/7) Ideal load target: Ideal_PtxTargetPS • Dynamic load target adjusted if – High DCH load or total load AND – Current load target deviates from ideal load target • Ideal load target estimated by RNC in dependence on – Non controllable traffic PtxNC = total non-controllable transmitted DCH power - power used by all HSDPA streaming users of the cell - non-controllable HSDPA power – NRT DCH traffic (sum over all weights of R99 services WeightDL_DCH) – NRT HS-DSCH traffic (sum over all weights of HSDPA services WeightHS-DSCH) Weight DL_DCH PtxNC Min Weight HS - DSCH Weight Ideal _ Ptx Target PS Max Ptx Target PSMax Ptx Target PSMin PtxMax PtxNC DL_DCH PtxTargetPSMaxHSRACH if HS-RACH is set up in the cell 63 © Nokia Siemens Networks RN31679EN40GLA1 Dynamic Load Target (5/7) Structured parameter WeightDCH Weight of NRT DCH UE BG RAB WeightDCHBG (RNHSPA) (0..100) ( = 1) (15) Weights of individual services Weight of NRT DCH UE THP1/2/3 RAB • Can be set individually for each release WeightDCHTHP1/2/3 (RNHSPA) (0..100) ( = 1) (90/65/40) – R99 (structured parameter WeightDCH) Structured parameter WeightHSPA of HSPA UE BG RAB – HSPA (structured parameter WeightHSPA) Weight WeightHSPABG (RNHSPA) (1..100) ( = 1) (25) • Can be set individually for each traffic class Weight of HSPA UE THP1/2/3 RAB WeightHSPATHP1/2/3 (RNHSPA) (0.100) ( = 1) (100/75/50) – Interactive THP1, THP2, THP3 – Background • In case of multi-RAB the average weight of the individual RABs is taken for that user Ideal Load Target - Example • 2 HS-DSCH users interactive THP1 + background WeightHS-DSCH = 100 + 25 = 125 Traffic Class HSDPA weight value 0…100 DCH weight value 0…100 Interactive THP1 100 90 Interactive THP2 75 65 Interactive THP3 50 40 Background 25 15 • 3 DCH users background WeightDL_DCH = 3 * 15 = 45 • PtxMax = 43 dBm • PrxNC = 37 dBm Ideal_PrxTargetPS = 37 dBm + (45 / (125 + 45)) * (43 dBm - 37 dBm) = 38.6 dBm 64 © Nokia Siemens Networks RN31679EN40GLA1 Load Target Adjustment (6/7) • Required information – Total power PtxTotal measured by Node B – Non HSDPA power PtxNonHSDPA measured by Node B – Both averaged according PSAveragingWindowSize (same parameter as for R99) • Need for adjustment checked periodically according PtxTargetPSAdjustPeriod • If adjustment needed – Increase by PtxTargetPSStepUp in case of DCH congestion – Decrease by PtxTargetPSStepDown in case of HSDPA congestion 65 PtxTargetPSStepUp PSAveragingWindowSize DCH PS target step up for dynamic HSDPA pwr alloc. WCEL; 0..5; 0.1; 1 dB Load measurement averaging window size for PS WBTS; 1..20; 1; 4 scheduling periods PtxTargetPSStepDown PtxTargetPSAdjustPeriod DCH PS target step down for dynamic HSDPA pwr alloc. WCEL (0..5 dB) ( = 0.1 dB) (1 dB) DCH PS target adjust period for dyn HSDPA power alloc; WBTS; 1..255; 1; 5 RRI periods © Nokia Siemens Networks RN31679EN40GLA1 Actions in Case of Congestion (7/7) DCH congestion only • Increase PtxTargetPS by PtxTargetPSStepUp, if currently below ideal load target (but not above PtxTargetPSMax) HSDPA congestion only • Decrease PtxTargetPS by PtxTargetPSStepDown, if currently above ideal load target (but not below PtxTargetPSMin) Both DCH & HSDPA congestion • Increase PtxTargetPS, if currently below ideal load target • Decrease PtxTargetPS, if currently above ideal load target 66 © Nokia Siemens Networks RN31679EN40GLA1