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
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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
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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
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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)
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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
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
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
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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
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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
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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
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