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Soc Classification level
Module 4 – HSDPA Parameters and RRM
Objectives
After this module the participant shall be able to:-
• Understand the functionality of HSDPA RRM in Nokia RAN
• Know the main RNC parameters controlling the HSDPA
functionality in Nokia RAN
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Soc Classification level
Module Contents
• HSDPA resource handling
• Channel type switching
• HSDPA mobility handling
• HSDPA channel type selection
• HSDPA with additional RAB initiation
• HSDPA associated uplink DPCH scheduling
• HSDPA code multiplexing
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Soc Classification level
Module Contents
• HSDPA resource handling
• HSDPA Dynamic Resource Allocation
• HSDPA (Static) Resource Allocation
• Maximum bit rate of HS-DSCH MAC-d flow
• Code allocation of HS-SCCH physical channels
• Channel type switching
• HSDPA mobility handling
• HSDPA channel type selection
• HSDPA with additional RAB initiation
• HSDPA associated uplink DPCH scheduling
• HSDPA code multiplexing
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Soc Classification level
Module Contents
• HSDPA resource handling
• HSDPA Dynamic Resource Allocation• Dynamic power allocation
• Dynamic NRT DCH scheduling
• Admission decision and overload control
• Prioritisation between HSDPA and NRT DCH power resources
• Dynamic allocation of HS-PDSCH codes
• HSDPA (Static) Resource Allocation
• Maximum bit rate of HS-DSCH MAC-d flow
• Code allocation of HS-SCCH physical channels
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Soc Classification level
HSDPA Dynamic Resource Allocation
• Optional feature HSDPA Dynamic Resource Allocation contains the following
new and improved functionalities• Dynamic power allocation
• HSDPA power limitation not sent from RNC to BTS, always dynamic in BTS
• Dynamic NRT DCH scheduling
• Prioritisation between NRT DCH and HSDPA traffic/power
• Dynamic allocation of HS-PDSCH codes
• RNC applies HSDPA dynamic resource allocation if
• Parameter HSDPADynamicResourceAllocation is set to ‘Enabled’
• RNC receives capability indication from the BTS (Node B) with regards to dynamic
resource allocation
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Soc Classification level
HSDPA power allocation methods
HSDPADynamicResource- Allocation
RNC sends the
PtxMaxHSDPA
to BTS
BTS allocates the
available DL power
dynamically to
HSDPA until PtxMaxHSDPA
Disabled
BTS allocates the
available DL power dynamically
toHSDPA until Cell max
DL power
Enabled
RNC schedules NRT DCH
according to HSDPApriority
RNC schedules NRT DCH
using dynamic NRT
scheduling
HSDPA (Static)
Resource Allocation
HSDPA dynamic
Resource Allocation
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Soc Classification level
Module Contents
• HSDPA resource handling
• HSDPA Dynamic Resource Allocation
• Dynamic power allocation
• Dynamic NRT DCH scheduling
• Admission decision and overload control
• Prioritisation between HSDPA and NRT DCH power resources
• Dynamic allocation of HS-PDSCH codes• HSDPA (Static) Resource Allocation
• Maximum bit rate of HS-DSCH MAC-d flow
• Code allocation of HS-SCCH physical channels
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Soc Classification level
Dynamic power allocation
• BTS allocates all unused DL power up to the max cell power
• All the power available after DCH traffic, HSUPA control channels and common channels
can be used for HSDPA
• PtxMax is the cellmaximum outputpower defined bythe managementparameter
PtxCellMax and theBTS capability(MaxDLPowerCapability )
PtxNC
PtxNRT
PtxHSDPA
PtxMax
PtxNonHSDPA
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Soc Classification level
Module Contents
• HSDPA resource handling
• HSDPA Dynamic Resource Allocation• Dynamic power allocation
• Dynamic NRT DCH scheduling
• Admission decision and overload control
• Prioritisation between HSDPA and NRT DCH power resources
• Dynamic allocation of HS-PDSCH codes• HSDPA (Static) Resource Allocation
• Maximum bit rate of HS-DSCH MAC-d flow
• Code allocation of HS-SCCH physical channels
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Soc Classification level
Dynamic NRT DCH scheduling
• RNC affects the HSDPA power allocation indirectly by scheduling NRT DCH bit
rates
• When there is at least one HS-DSCH MAC-d flow allocated in the cell,
PtxTargetPS is used for packet scheduling and handover control purposes
• PtxTargetPS is adjusted between PtxTargetPSMin and PtxTargetPSMax
• PtxTargetPSAdjustPeriod defines the adjustment period for the PtxTargetPS in
terms of Radio Resource Indication (RRI) reporting periods
• If PtxTargetPSMax and PtxTargetPSMin are set to the same value, RNC does
not adjust PtxTargetPS Dynamic NRT DCH scheduling disabled
PtxTargetPSMin PtxTargetPS PtxTargetPSMax
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Soc Classification level
Dynamic NRT DCH scheduling
With no active HSDPA users:
1) NRT DCH scheduling to thePtxTarget+PtxOffset &RT DCH admission
to PtxTarget
With active HSDPA users:
2) NRT DCH scheduling to PtxTargetPS3) RT DCH admission to PtxTarget
HSDPA activeNo HSDPA users No HSDPA users
PtxTarget
+PtxOffset
PtxMax
PtxTargetPS
PtxNC
PtxNRT
PtxHSDPA
1
2
3
PtxNonHSPA
PtxTotal
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Soc Classification level
Dynamic NRT DCH scheduling – Adjustment
• Initial value of the PtxTargetPS is the lower from the following ones: PtxTarget or
PtxTargetPSMax
• Initial value is taken into use when the first HS-DSCH MAC-d flow is setup
• Usage ends when the last HS-DSCH MAC-d flow is deleted
• PtxTarget remains as a target for non-controllable load even if there are one or more
HS-DSCH MAC-d flows setup in the cell
• PtxTargetPS is adjusted based on received PtxTotal (Transmitted Carrier Power)
and PtxNonHSPA
• PtxNonHSPA = Transmitted carrier power of all codes not used for HS-PDSCH, HS-
SCCH, E-AGCH, E-RGCH or E-HICH transmission
• PtxTargetPS is adjusted only when there are NRT DCH users - in addition to the
HS-DSCH MAC-d flow(s) - in the cell.
• Adjustment of the PtxTargetPS is done in fixed steps, defined by the
PtxTargetPSStepUp and PtxTargetPSStepDown management parameters
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Soc Classification level
Dynamic NRT DCH scheduling – Power congestion
1) Power congestion for HSDPA:
PtxTotal ≥ PtxHighHSDPAPwr
2) Power congestion for NRT DCH:
PtxNonHSPA ≥ (PtxTargetPS – 1 dB)
HSDPA active
PtxTarget
+PtxOffset
PtxMax
PtxTargetPS
PtxNC
PtxNRT
PtxHSDPA
1
2
PtxNonHSPA
PtxTotalPtxHighHSDPAPwr
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Soc Classification level
• Target (ideal) value for the PtxTargetPS is calculated for each adjustment period defined
by the management parameter PtxTargetPSAdjustPeriod
• Target (ideal) value for the PtxTargetPS is calculated as follows (in a linear fashion):
• Pmax is the cell maximum transmission power
• Ptx_nc is the total non-controllable transmitted DL power
• PSMax is the maximum allowed value for PtxTargetPS defined by the management parameter
PtxTargetPSMax
• PSMin is the minimum allowed value for PtxTargetPS defined by the management parameter
PtxTargetPSMin
• WeightRatio is the relative weight of DCH , i.e. WeightDCH / (WeightHSDPA + WeightDCH)
• WeightHSDPA is the summed weight of the HS-DSCH radio access bearers (MAC-d flows) and
WeightDCH is the summed weight of the NRT DCH radio access bearers
Dynamic NRT DCH scheduling – Ideal PtxTargetPS
PtxTargetPSTarget = MAX {MIN {P tx_nc + [(P max - P tx_nc ) x Weight Ratio], PSMax }, PSMin}
Current available power for NRT DCH + HSDPA
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Soc Classification level
Dynamic NRT DCH scheduling – Example
• Pmax (cell maximum transmission power) = 20W (43 dBm)
• PtxTargetPSMax = 13W (41,14 dBm)• PtxTargetPSMin = 4W (36,02 dBm)
• Ptx_nc (total prevailing non-controllable DL load) = 5W
• 1 NRT DCH user (THP1, weight 0.9) + 1 HSDPA user (THP1, weight 1.0) + 1
HSDPA user (BG, weight 0.25)
WeightRatio = 0.9 / (1+0.25 + 0.9) = 0.42
• Target (ideal) NRT DCH scheduling target =
PtxTargetPSTarget = MAX{MIN{5W+[(20W-5W)x0.42],13W}, 4W} = 11.3W
Current available power for NRT DCH + HSDPA = 15 W
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Soc Classification level
MAC-d flow(s) setup in the cell
NRT DCH user(s) in the cell
PtxTotal received
Yes
PtxTotal >=PtxHighHSDPAPwr
NoPtxTargetPS >
PtxTargetPSTarget
Yes
No decrease
Check increase
No
Decrease PtxTargetPS
Dynamic NRT DCH scheduling – PtxTargetPS decrease
• PtxTargetPS is decreased if
• PtxTotal > PtxHighHSDPAPwr= HSDPA power congestion
& PtxTargetPS > PtxTargetPSTarget
• Above target value
• Amount of decrease is determined
by the management parameter
PtxTargetPSStepDown, but limited
to
• PtxTargetPS ≥ PtxTargetPSTarget
PtxTargetPSTarget = target (ideal)value of the NRT DCH
scheduling target
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Dynamic NRT DCH scheduling – PtxTargetPS increase
• PtxTargetPS is increased if
• PtxNonHSPA > PtxTargetPS - 1 dB
= Power congestion on DCH
& PtxTargetPS < PtxTargetPSTarget
• Below target value
• Amount of increase is determined by
the management parameterPtxTargetPSStepUp
PtxTargetPSTarget = target (ideal)value of the NRT DCH
scheduling target
MAC-d flow(s) setup in the cell
NRT DCH user(s) in the cell
PtxNonHSPA received
Yes
PtxNonHSPA >=
(PtxTargetPS - 1 dB)
Yes
No increaseCheck decrease
No
Increase PtxTargetPS
NoPtxTargetPS <
PtxTargetPSTarget
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Soc Classification level
Dynamic NRT DCH scheduling – Summary
1) Power congestion for HSDPA:
PtxTotal ≥ PtxHighHSDPAPwr
Decrease PtxTargetPS downto
PtxTargetPSTarget
2) Power congestion for NRT DCH:PtxNonHSPA ≥ (PtxTargetPS – 1 dB)
Increase PtxTargetPS uptoPtxTargetPSTarget
HSDPA active
PtxTarget +PtxOffset
PtxMax
PtxTargetPS
PtxNC
PtxNRT
PtxHSDPA
1
2
PtxNonHSPA
PtxTotalPtxHighHSDPAPwr
PtxTargetPSTarget
PtxTargetPSMax
PtxTargetPSMin
Dynamic Power Allocation and NRT Scheduling
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Dynamic Power Allocation and NRT Scheduling
Parameters
• HSDPADynamicResourceAllocation
• Range:0 (Disabled), 1 (Enabled), Default:0,
Object:RNC• HSDPApriority
• Range:1 (HSDPA priority 1), 2 (HSDPA priority2), Default:1, Object:RNC
• PtxCellMax
• Range and step: 0..50 dBm, step 0.1 dBm,Default: 43 dBm, Object:WCEL
• MaxDLPowerCapability• Range and step: 0..50 dBm, step 0.1 dBm
Default value: -, Default value notes: Value setby the system, Object: WCEL
• PtxTargetPSMin
• Range:-10..50 dBm, step 0.1 dBm, Default:36dBm, Object:WCEL
• PtxTargetPSMax
• Range:-10..50 dBm, step 0.1 dBm, Default:40dBm, Object:WCEL
• PtxTargetPSAdjustPeriod
• Range:1..255, step 1, Default:10O, bject:WCEL
• PtxTargetHSDPA• Range:-10 … 50 dBm, step 0.1 dBm,
Default:38.5 dBm, Object:WCEL
• PtxOffsetHSDPA
• Range:0 … 6 dB, step 0.1 dB, Default:0.8 dB,Object:WCEL
• PtxTargetPSStepUp
• Range:-0..5 dB, step 0.1 dB, Default:1 dB,Object:WCEL
• PtxTargetPSStepDown
• Range:-0..5 dB, step 0.1 dB, Default:1 dB
• PtxHighHSDPAPwr
• Range:-10..50 dBm, step 0.1 dBm, Default:41dBm, Object:WCEL
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Soc Classification level
Module Contents
• HSDPA resource handling
• HSDPA Dynamic Resource Allocation• Dynamic power allocation
• Dynamic NRT DCH scheduling
• Admission decision and overload control
• Prioritisation between HSDPA and NRT DCH power resources
• Dynamic allocation of HS-PDSCH codes
• HSDPA (Static) Resource Allocation
• Maximum bit rate of HS-DSCH MAC-d flow
• Code allocation of HS-SCCH physical channels
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Soc Classification level
DL TX power overload control
• DL TX power overload control is modified to co-operate with the dynamic HSDPApower allocation
• When there is at least one HS-DSCH MAC-d flow allocated in the cell, the targetfor non-controllable load is PtxTarget , and target for NRT DCH packet schedulingis PtxTargetPS
• DL overload control actions are targeted to NRT DCH(s) – not HS-DSCH MAC-dflows
• BTS adjusts power
no DL overload due to HSDPA Tx power• RNC detects DL overload from the non-HSDPA power measurement
• Overload control actions in downlink are started if the following condition is truewhen there are NRT DCH(s) allocated in the cell :
• Ptx_offset is defined by the management parameter PtxOffset
offset tx PS et t tx
HSPAnontx P P P _ _ arg _
_ _
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Soc Classification level
DL TX power overload control
1) DL overload: PtxNonHSDPA ≥ PtxTargetPS + PtxOffset
Decrease NRT PS with (Enhanced) Overload Control
HSDPA active
PtxTarget +PtxOffset
PtxMax
PtxTargetPS
PtxNC
PtxNRT
PtxHSDPA
1
PtxNonHSPA
PtxTotal
PtxTargetPS+
PtxOffset
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Soc Classification level
Module Contents
• HSDPA resource handling
• HSDPA Dynamic Resource Allocation• Dynamic power allocation
• Dynamic NRT DCH scheduling
• Admission decision and overload control
• Prioritisation between HSDPA and NRT DCH power resources
• Dynamic allocation of HS-PDSCH codes
• HSDPA (Static) Resource Allocation
• Maximum bit rate of HS-DSCH MAC-d flow
• Code allocation of HS-SCCH physical channels
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P i iti ti b t HSDPA d DCH
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Soc Classification level
Prioritisation between HSDPA and DCH resources
• A particular traffic class (THP) can be excluded in determination of weight values by
setting the the traffic class (THP) specific weight value to 0
• Cell level weight is obtained by summing the weight value of each user up
• Weight of an individual user is an averaged weight of its NRT PS radio access bearers
• Weight of an individual user depends on the traffic class and traffic handling priority of its
NRT PS radio access bearers
• Whether user is included in the HSDPA traffic type or NRT DCH traffic type depends
on its allocated transport channel (DCH or HS-DSCH) in downlink
• RT traffic, e.g. AMR speech CS RAB, has always higher priority to NRT DCH and
HSDPA (HS-DSCH MAC-d flow) traffic
P i iti ti b t HSDPA d DCH
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Prioritisation between HSDPA and DCH resources
• Weight of an individual user is an averaged weight of its NRT PS radio access
bearers
• Example1:• User1 with 1 AMR speech CS RAB + 1 PS RAB established (I/A THP2 HS-DSCH)
• WeightHSDPATHP2 = 90
• Weight value of the User1 = 90
• Example2:
• User2 with 2 PS RABs established (1 I/A THP1 DCH + 1 B/G DCH)
• WeightDCHTHP1 = 100, WeightDCHBG = 50
• Weight value of the User2 = (100 + 50)/2 = 75
• Cell level weight is obtained by summing the weight value of each user up
• Example3:
• User1: HSDPA weight = 90, User2: DCH weight = 75, User3: HSDPA weight = 100, User4: DCH
weight = 80, User5: DCH weight = 60
• WeightHSDPA
= User1+User3 = 190, WeightDCH
= User2+User4+User5 = 215,
• WeightRatio = 215 / (215 + 190) = 0.53
• Dynamic power allocation algorithm utilises WeightRatio
M d l C t t
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Soc Classification level
Module Contents
• HSDPA resource handling
• HSDPA Dynamic Resource Allocation• Dynamic power allocation
• Dynamic NRT DCH scheduling
• Admission decision and overload control
• Prioritisation between HSDPA and NRT DCH power resources
• Dynamic allocation of HS-PDSCH codes
• HSDPA (Static) Resource Allocation
• Maximum bit rate of HS-DSCH MAC-d flow
• Code allocation of HS-SCCH physical channels
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HS PDSCH code set
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HS-PDSCH code set
• RNC allocates HS-PDSCH codes from the set of codes defined by the managementparameters HSPDSCHCodeSet10 and HSPDSCHCodeSet15 for HSDPA 10 Codes and
HSDPA 15 Codes, respectively
Number of HS-PDSCH codes (full
set)
HSDPA15
Codes
HSDPA10
Codes
Staticcode
allocation
5 X X X6 - - -
7 - - -
8 X X -
9 - - -
10 X X -
11 - - -12 X - -
13 - - -
14 X - -
15 X - -
Default values forHS-PDSCH code
sets
Two UEs: 4 + 4
Two UEs: 5 + 5
Three UEs: 4 + 4 + 4
One UE: 14 practical max.
Maximum code allocation for HSDPA
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Maximum code allocation for HSDPA
• Allocation of 15 is not possible when more than 2 HSDPA users active or 1 AMR
user in the cell 15 theoretical value
SF=1
SF=2
SF=4
SF=8
SF=16
SF=32
SF=64
SF=128
SF=256
15 HS-PDSCH codes
Up to three HS-SCCH codes
Codes for common
channels in the cell
Codes for associated DCHs and
non-HSDPA users
Maximum code allocation with HSUPA
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Maximum code allocation with HSUPA
• Allocation of 15 is not possible when HSUPA is enabled in the cell
SF=1
SF=2
SF=4
SF=8
SF=16
SF=32
SF=64
SF=128
SF=256
14 HS-PDSCH codes
Up to three HS-
SCCH codes
Codes for common
channels in the cell Codes for associated DCHs and
non-HSDPA users
E-AGCH (256)
E-RGCH/E-HICH (128)
Dynamic code allocation procedure
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Dynamic code allocation procedure
• Initial allocation of HS-PDSCH codes (SF=16) is executed in the cell setup phase
• The minimum number of HS-PDSCH codes is allocated initially
• RNC attempts to upgrade HS-PDSCH codes
• 1) In conjunction of the HS-DSCH MAC-d flow setup
• 2) Periodically
• RNC downgrades HS-PDSCH codes
• 1) Periodically• 2) In the case of DPCH code congestion
• RNC applies the timer HSPDSCHAdjustPeriod for periodical HS-PDSCH code
adjustment
• When the first HS-DSCH MAC-d flow is setup in the cell, RNC starts the timer
HS-PDSCH code upgrade - Periodical
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Soc Classification level
HS-PDSCH code upgrade - Periodical
• RNC periodically upgrades HS-PDSCHcodes providing:
1. The number of currently allocated HS-
PDSCH codes is lower than themaximum allowed number of HS-PDSCH codes
2. BTS capability does not limit upgrade
3. Free SF=16 codes, which are adjacentto the currently allocated HS-PDSCHcodes, can be found in order to takethe next higher value from HS-PDSCH
code set into use4. Free SF=16 codes can be found sothat after upgrade number of freeSF=128 codes is greater than or equalto the value defined by themanagement parameterHSPDSCHMarginSF128 (def. 8)
• If the conditions for the periodical
upgrade are effective, the next greatervalue from the HS-PDSCH code set istaken into use.
CodeN HS-PDSCH codes allocated in the code set
HSPDSCHAdjustPeriod
expires
Keep the current number ofHS-PDSCH codes
Enough SF#128 codes
available after upgrade
No
Yes
Yes
Yes
Take the value CodeN+1 fromcode set into use
Cell/BTS capable of
CodeN+1 number of codes
CodeN < CodeMAX
Free SF#16 codes available
for CodeN+1
Yes
HS-PDSCH code downgrade - Periodical
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Soc Classification level
HS-PDSCH code downgrade - Periodical
• RNC periodically downgrades HS-
PDSCH codes providing:
1. Timer for periodical adjustment ofthe HS-PDSCH codes(HSPDSCHAdjustPeriod ) expires
2. The number of currently allocatedHS-PDSCH codes is higher thanthe minimum allowed number of
HS-PDSCH codes
3. The number of currently availableSF128 codes is lower thanHSPDSCHMarginSF128 or thereis(are) no HS-DSCH MAC-d flow(s)setup in the cell.
• If the conditions determined above
are effective, the next lower valuefrom the HS-PDSCH code set istaken into use
CodeN HS-PDSCH codes allocated in the code set
HSPDSCHAdjustPeriod
expires
Yes
CodeN > Code
MIN
Available SF128 codes <HSPDSCHMarginSF128
Yes
Take the value CodeN-1
from
code set into use
Keep the current number of
HS-PDSCH codes
No
No
HS-DSCH MAC-d flow(s) exists YesNo
Code congestion
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Code congestion
• RNC downgrades HS-PDSCH code(s) due to DPCH code congestion
• RNC does not downgrade HS-PDSCH codes lower than the minimum allowed
number of HS-PDSCH codes
• If RT request is congested due to lack of DPCH code(s), HS-PDSCH codes are
downgraded in order to admit RT request
• If NRT DCH scheduling is congested due to lack of DPCH code(s), HS-PDSCH
codes are downgraded in order to admit NRT DCH request
• # HS-PDSCH codes > DPCHOverHSPDSCHThreshold
• The number of HS-PDSCH codes after downgrade will be the highest possiblefrom the HS-PDSCH code set
Code congestion – HS-DSCH code downgrade
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Code congestion HS DSCH code downgrade
• Periodical HS-DSCH code
downgrade if the number of
currently available SF128codes is lower than
HSPDSCHMarginSF128
• HS-DSCH code downgrade
due to NRT DCH code
congestion is allowed if
number of currently allocated
HS-PDSCH codes is greater
thanDPCHOverHSPDSCHThresh
old N u m b e r o f a l l o c a t e d S F 1 6 c o d e s
N u m b e r o f r e s e r v e d S
F 1 2 8 c o d e s
DPCHOverHSPDSCHThreshold
6
78
9
10
11
12
1314
15 Maximum in
code set
HSPDSCHMarginSF128
5
38
48
58
68
78
8898
108118
128
0
Code tree optimisation
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Soc Classification level
Code tree optimisation
• After upgrade of the HS-PDSCH codes triggering condition of the code tree
optimisation procedure is checked
• Code change procedure tries to re-arrange the DPCH codes in order to make
room for HS-PDSCH code upgrade
• If there are DPCH codes in the shared code area, the following conditions andrules are checked each time a DPCH code is released:
1. Management parameter CodeTreeOptimisation is enabled in the cell
2. Number of currently allocated HS-PDSCH codes is lower than the maximum allowed
number of HS-PDSCH codes
3. DPCHs having only SRB DCH are not allowed to be re-arranged
4. All DPCH codes (SF8-SF256) can be accommodated in other than HS-PDSCH
code upgrade area, i.e. upgrade of the HS-PDSCH codes is possible
Dynamic Resource Allocation Parameters
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Soc Classification level
Dynamic Resource Allocation Parameters
• WeightHSDPA
• Range:1..100, step 1, Object:RNC
• Default: WeightHSDPATHP1=100, WeightHSDPATHP2=75, WeightHSDPATHP3=50,WeightHSDPABG=25)
• WeightDCH
• Range:1..100, step 1, Object:RNC
• Default: WeightDCHTHP1=90, WeightDCHTHP2=65, WeightDCHTHP3=40, WeightDCHBG=15
• HSPDSCHCodeSet
• Bitmask (16 bits, bit 5 = 5 codes enabled etc.), Default: with 5 codes 32 (bit 5 = 1), with 10 codes
1312, with 15 codes 54560• HSPDSCHAdjustPeriod
• Range:1..60 s, step 1 s, Default:10 s, Object:RNC
• HSPDSCHMarginSF128
• Range and step: 0..128, step 1, Default value: 8, Object:WCEL
• DPCHOverHSPDSCHThreshold
• Range and step: 0..10, step 1 Default: 0, Object: WCEL• CodeTreeOptimisation
• Range and step: 0 (Optimisation not used), 1 (Optimisation used) Default: 1, Object: WCEL
Module Contents
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Soc Classification level
• HSDPA resource handling
• HSDPA Dynamic Resource Allocation
• HSDPA (Static) Resource Allocation
• Code allocation of HS-PDSCH physical channels
• Allocation of the HSDPA power
• Selecting the priority of HSDPA
• Maximum bit rate of HS-DSCH MAC-d flow
• Code allocation of HS-SCCH physical channels
HSDPA (Static) Resource Allocation
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Soc Classification level
( )
• HSDPA (static) resource allocation is applied if HSDPA dynamic resource
allocation is not enabled
• This feature consists of
• Static allocation of HS-PDSCH codes
• Static allocation of power resources for HSDPA in RNC
• BTS applies dynamic power allocation regardless of the resource allocation
method in RNC
Allocation of the HSDPA power
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Soc Classification level
p
• The PtxMaxHSDPA parameter defines the maximum amount of HSDPA power
(HS-PDSCH and HS-SCCH total power)
• HSDPA power and number of HS-PDSCH codes are signalled to the BTS
• NBAP: Physical Shared Channel Reconfiguration procedure after cell setup in cells
that support HSDPA and have HSDPA enabled (parameter HSDPAenabled )
• HSDPA transmission power is limited by RNC so that
PtxMaxHSDPA < PtxMax - PtxTargetHSDPA
, where PtxMax = MIN(PtxCellMax , MaxDLPowerCapability) , PtxTargetHSDPA isthe PS scheduling target for PS NRT DCH
Module Contents
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Soc Classification level
• HSDPA resource handling
• HSDPA Dynamic Resource Allocation
• HSDPA (Static) Resource Allocation
• Maximum bit rate of HS-DSCH MAC-d flow
• Code allocation of HS-SCCH physical channels
Code allocation of HS-SCCH physical channels
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Soc Classification level
• RNC allocates 0…3 HS-SCCH
(SF=128) codes to the cell by
using the primary scrambling code• HSDPA needs at least one code
and more than one code is needed
if feature HSDPA Code
Multiplexing is chosen to be used
• HSDPAenabled and
MaxNbrOfHSSCCHCodes are celllevel RNP parameters
• Codes for HS-SCCH channels are
reserved in cell-setup phase and
so HS-SCCH code configuration
can not be changed on-line Do not allocateHS-SCCH codes
Allocate HS-
SCCHs depending
onMaxNbrOfHSSCC
HCodesparameter
BTS HSDPAcapable No
HSDPAEnabled in
the cell
Yes
No
Allocate one HS -SCCH code
END
Code-mux
activated in RNC
START
No
Yes
Yes
Code-mux
supported in BTSNo
Yes
Parameters
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• PtxMaxHSDPA
• Range:0 … 50 dBm, step 0.1 dBm, Default:37.8 dBm, Object:WCEL
• PtxTargetHSDPA
• Range:-10 … 50 dBm, step 0.1 dBm, Default:38.5 dBm, Object:WCEL
• HSDPApriority
• Range:1 (HSDPA priority 1), 2 (HSDPA priority 2), Default:1, Object:RNC
• MaxBitRateNRTMACDFlow
• Range:64, 128, 256, 384,512, … , 14080; step 128 kbps, Default:9600 kbps *), Object:RNC • RNC supports the maximum user bit rate of the HS-DSCH MAC-d flow up to 6.72 Mbps, which
corresponds with the maximum air-interface bit rate 7.2 Mbps
• HSDPAPeakRateLimitRABMax
• Range:0 (No limitation), 1 (Limitation is active), Default:1, Object:RNC
• MaxNbrOfHSSCCHCodes
• Range:1..3, step 1, Default:1, Object:WCEL
Module Contents
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Soc Classification level
• HSDPA resource handling
• Channel type switching
• Direct DCH to HS-DSCH switch
• Direct HS-DSCH to DCH switch
• HSDPA mobility handling
• HSDPA channel type selection
• HSDPA with additional RAB initiation
• HSDPA associated uplink DPCH scheduling
• HSDPA code multiplexing
Channel type switching
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Soc Classification level
• Channel type switching is functionality where PS interactive/background radio
bearer mapping is changed from DCH to HS-DSCH or from HS-DSCH to DCH
• Switch to DCH is needed if use of HS-DSCH is not possible anymore
• Switch to HS-DSCH is needed when RB is mapped to DCH but conditions to use HS-
DSCH are fulfilled
• HSDPA is used every time when its use is possible
• Basic HSDPA functionality contains the following switches• Direct DCH to HS-DSCH switch
• Direct HS-DSCH to DCH switch
• In both switches above, DCH 0/0 is not used or it is ,at least, tried to be avoided
Module Contents
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Soc Classification level
• HSDPA resource handling
• Channel type switching
• Direct DCH to HS-DSCH switch
• Direct HS-DSCH to DCH switch
• HSDPA mobility handling
• HSDPA channel type selection
• HSDPA with additional RAB initiation
• HSDPA associated uplink DPCH scheduling
• HSDPA code multiplexing
Direct DCH to HS-DSCH switch
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Soc Classification level
• In direct DCH to HS-DSCH switch PS interactive/background radio bearer that is
mapped to DCH is reconfigured to HS-DSCH
Triggers for DCH to HS-DSCH switching
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Soc Classification level
1. First HSDPA capable cell is added to the active set
• UE enters to HSDPA coverage
2. RAB configuration of the UE is changed so that it supports HS-DSCH
3. Initial HS-DSCH reservation did not succeed for temporary reason
• DCH was allocated although HS-DSCH was supported
4. HS-DSCH to DCH switch is done for IFHO/ISHO measurement, but IFHO or
ISHO was not performed due to unsatisfied measurement results
Conditions for starting DCH to HS-DSCH switch
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Soc Classification level
1. UE has RAB combination that supports HSDPA (just I/B PS RAB or AMR+I/B
PS RAB)
• PS I/B RB is mapped to DCH
2. UE and at least one cell in active set are HSDPA capable
• If HSDPAMobility is disabled , active set size must be 1
3. CPICH Ec/No of HSDPA cell > CPICH Ec/No best AS cell –
HSDPAChaTypeSwitchWindow
• Candidate cell for HS-DSCH must be good enough compared to the best cells in
active set
4. No inactivity or low utilization detected on DCH (DL/UL)
5. No guard timers running to prevent HS-DSCH selection
• HsdschGuardTimerHO, HSDSCHGuardTimerLowThroughput,
HSDSCHCTSwitchGuardTimer, DCH to HS-DSCH switch retry prevention timer
Examples for starting DCH to HS-DSCH switch
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Soc Classification level
• Change of RAB combination
• Release of video call
• Handover from cell without HSDPA
capability
• SHO with HSSPAMobility
• IFHO
• After HsdschGuardTimerHO
HSDPAnon-HSDPA
SWITCH
f1
f2
Measurements for the switch
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Soc Classification level
• The quality of the candidate cell is validated by using periodical CPICH Ec/No
measurement
• RNC must have at least one measurement report containing CPICH Ec/No values forthe branches of the active set before the switch can be made
• Reporting period defined by the RNC level RNP parameter
HSDPACPICHCTSRepPer
• Otherwise this measurement has the same attributes and principles as periodicalCPICH Ec/No measurement in mobility case
• EcNoFilterCoefficient
• HSDPACPICHAveWindow
DCH to HS-DSCH switch execution
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Soc Classification level
• It is checked that there are no other things preventing use of HS-DSCH
(for example maximum number of simultaneous HSDPA users)
• If new HSDPA user is not possible to be added to the cell then possible other cells inactive set are checked
• If a cell with free HSDPA capacity is found, then
• RNC and AAL2 resources are reserved for HS-DSCH
• Radio links, transport channel and radio bearer are reconfigured(DCH X/X DL:HS-DSCH, UL: DCH X)
• Radio bearer is mapped to HS-DSCH
• RNC and AAL2 resources for DCH are released
• HS-DSCH specific measurements are configured to the UE
Module Contents
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Soc Classification level
• HSDPA resource handling
• Channel type switching
• Direct DCH to HS-DSCH switch
• Direct HS-DSCH to DCH switch
• HSDPA mobility handling
• HSDPA channel type selection
• HSDPA with additional RAB initiation
• HSDPA associated uplink DPCH scheduling
• HSDPA code multiplexing
Direct HS-DSCH to DCH switch
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Soc Classification level
• In direct HS-DSCH to DCH switch PS interactive/background radio bearer that is
mapped to HS-DSCH is reconfigured to DCH
• Use of DCH 0/0 is tried to be avoided
• This functionality does not bring any new reasons/triggers for HS-DSCH to DCH
switch
• See ‘HSDPA channel type selection’
• DCH is tried to be reserved in the next scheduling period with the initial bit rates
defined by the RNP parameters InitialBitRateUL and InitialBitRateDL
• If the initial bit rates can not be allocated, then zero bit rates are used instead (DCH
0/0)
Parameters
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• HSDPAChaTypeSwitchWindow
• Range and step: 0..4 dB, step 0.5 dB, Defaultvalue: 0 dB, Object:RNC
• HsdschGuardTimerHO• Range and step: 0..30 s, step 1 s Default value:
5 s, Object:RNC
• HSDSCHGuardTimerLowThroughput
• Range and step: 0..240 s, step 1 s Default value:30 s, Object:RNC
• HSDSCHCTSwitchGuardTimer
• Range and step: 0..30 s, step 1 s Default value:5 s, Object:RNC
• HSDPACPICHCTSRepPer
• Range and step: 0 (500 ms), 1 (1000 ms), 2(2000 ms), 3 (3000 ms), 4 (4000 ms), 5 (6000ms) Default value: 2, Object:RNC
• HSDPACPICHAveWindow
• Range and step: 1..10, step 1 Default value: 3,Object:RNC
• EcNoFilterCoefficient
• Range and step: 0 (Filtering period of 200 ms ),1 (Filtering period approximates 300 ms), 2
(Filtering period approximates 400 ms), 3(Filtering period approximates 600 ms), 4(Filtering period approximates 800 ms), 5(Filtering period approximates 1100 ms), 6(Filtering period approximates 1600 ms) Defaultvalue: 3, Object:FMCS
• InitialBitRateUL
• Range and step: 8 (8 kbps), 16 (16 kbps), 32 (32
kbps), 64 (64 kbps), 128 (128 kbps), 256 (256kbps), 384 (384 kbps) Default value: 64,Object:WCEL
• InitialBitRateDL
• Range and step: 8 (8 kbps), 16 (16 kbps), 32 (32kbps), 64 (64 kbps), 128 (128 kbps), 256 (256kbps), 384 (384 kbps) Default value: 64 ,Object:WCEL
Module Contents
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• HSDPA resource handling
• Channel type switching
• HSDPA mobility handling
• HSDPA mobility handling with the Serving HS-DSCH Cell Change
• Measurement control and handover path parameters
• HSDPA cell reselection
• Directed RRC connection setup for HSDPA layer• HSPA layering for UEs in common channels
• HSDPA channel type selection
• HSDPA with additional RAB initiation
• HSDPA associated uplink DPCH scheduling
• HSDPA code multiplexing
HSDPA mobility handling
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Soc Classification level
• In Nokia RAN, there are two methods available to handle the HSDPA mobility
1. HSDPA mobility handling with the serving HS-DSCH cell change
2. HSDPA cell reselection and HSDPA mobility handling with DCH switching (HSDPAcell reselection)
• Operators can set the preferred method with the management parameter
HSDPAMobility• = 0 (Disabled), use HSDPA cell reselection
• = 1 (Enabled), use serving HS-DSCH cell change
Module Contents
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• HSDPA resource handling
• Channel type switching
• HSDPA mobility handling• HSDPA mobility handling with the Serving HS-DSCH Cell Change
• Measurement reporting
• Measurement setup
• Initial serving cell selection
• Serving HS-DSCH Cell Change algorithm
• Measurement control and handover path parameters
• HSDPA cell reselection
• Directed RRC connection setup for HSDPA layer
• HSPA layering for UEs in common channels
• HSDPA channel type selection
• HSDPA with additional RAB initiation
• HSDPA associated uplink DPCH scheduling
• HSDPA code multiplexing
Serving HS-DSCH Cell Change
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Soc Classification level
1. Intra Node-B serving HS-DSCH cell change
2. Inter Node-B serving HS-DSCH cell change
3. HS-DSCH to DCH switch (needed if the UE is moving to a cellwithout HSDPA support or inter-RNC case with SHO)
Full intra-frequency mobility for HSDPA users and enablesHSDPA also in SHO region
HSDPA capable cell
HSDPA not supported
12
3
HSDPA Handover UL/DL DCH = soft/softer HO ; DL HS-DSCH = serving cell change
Serving HS-DSCH Cell Change
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HS-SCCH
HS-PDSCH
DPCH
DPCHServingHS-DSCH cell
Soft/softer handover is not supported
for HS-SCCH/HS-PDSCH.
HS-DPCCH
• Transmission of the HS-SCCH and the HS-PDSCH to one UE belongs to only
one of the radio links assigned to the UE
• No soft/softer handover support
• Synchronized change of the serving HS-DSCH cell allows implementation of
HSDPA with full mobility and coverage, including HSDPA coverage for UEs with
an active set size larger than one for its dedicated channels
Module Contents
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Soc Classification level
• HSDPA resource handling
• Channel type switching
• HSDPA mobility handling
• HSDPA mobility handling with the Serving HS-DSCH Cell Change
• Measurement reporting• Measurement setup
• Initial serving cell selection
• Serving HS-DSCH Cell Change algorithm
• Measurement control and handover path parameters• HSDPA cell reselection
• Directed RRC connection setup for HSDPA layer
• HSPA layering for UEs in common channels
• HSDPA channel type selection
• HSDPA with additional RAB initiation
• HSDPA associated uplink DPCH scheduling
• HSDPA code multiplexing
Measurement reporting and Serving HS-DSCH CellChange
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Event Description Actions on HSDPA
1A A primary CPICH enters the reporting
range.
Start HSDPA specific measurements
1B A primary CPICH (Serving HS-DSCH cell)
leaves the reporting range.
Trigger for serving HS-DSCH cell change
1C A non-active primary CPICH becomes
better than an active (Serving HS-DSCH
cell) one
Trigger for serving HS-DSCH cell change
6F/6G UE Rx-Tx time difference for a RL
included in the active set becomes larger
than an absolute threshold
Trigger for serving HS-DSCH cell change
1F A primary CPICH goes below the absolute
threshold.
Trigger for releasing the HS-DSCH MAC-d flow (after 1F for
all AS cells) + for AMR multi-RAB inter-frequency/-RAT
measurements
6A UE Tx power exceeds the absolute
threshold.
Trigger for releasing the HS-DSCH MAC-d flow + for AMR
multi-RAB inter-frequency/-RAT measurements
Uplink quality deterioration report (in RNC) Trigger for releasing the HS-DSCH MAC-d flow
DL transmitted code power > limit Trigger for releasing the HS-DSCH MAC-d flow + for AMR
multi-RAB inter-frequency/-RAT measurements
Module Contents
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Soc Classification level
• HSDPA resource handling
• Channel type switching
• HSDPA mobility handling
• HSDPA mobility handling with the Serving HS-DSCH Cell Change
• Measurement control and handover path parameters
• HSDPA cell reselection
• Directed RRC connection setup for HSDPA layer
• HSPA layering for UEs in common channels
• HSDPA channel type selection
• HSDPA with additional RAB initiation
• HSDPA associated uplink DPCH scheduling
• HSDPA code multiplexing
HSDPA specific parameters for handovers
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Soc Classification level
• HSDPAFMCS/I/Gidentifier
• Identifies parameter set for inter-/intra-frequency and inter-system measurements of a user having HS-DSCH allocated.
• RTWithHSDPAFmcs/i/gIdentifier, RTWithHSDPAHopsIdentifier • When AMR speech CS RAB is established simultaneously (possible when parameter
AMRWithHSDSCH is enabled) with an NRT PS RAB having HS-DSCH transport channel
• HSDPAHOPSidentifier
• Identifies parameter set for intra-frequency HOs of a user having HS-DSCH allocated.
• HsdschGuardTimerHO
• Defines time when HS-DSCH allocation is not allowed for a UE, after successful channel type switchingto DCH due to any HO reasons.
• Default, 5s.
• The HSDPA coverage can be maximised by defining separate measurement control
and handover path parameters for UE that supports HSDPA
• These HSDPA-specific parameter sets are sent with the RRC: MEASUREMENTCONTROL when a HS-DSCH transport channel is being allocated.
Module Contents
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• HSDPA resource handling
• Channel type switching
• HSDPA mobility handling
• HSDPA mobility handling with the Serving HS-DSCH Cell Change
• Measurement control and handover path parameters
• HSDPA cell reselection and DCH switching
• Directed RRC connection setup for HSDPA layer
• HSPA layering for UEs in common channels
• HSDPA channel type selection
• HSDPA with additional RAB initiation
• HSDPA associated uplink DPCH scheduling
• HSDPA code multiplexing
HSDPA cell reselection and DCH switching
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Soc Classification level
• Setting the parameter HSDPAMobility to Disabled activates
• HSDPA cell reselection
• Mobility handling with DCH switching• HSDPA cell reselection applies transition to the CELL_FACH state
• When UE enters soft handover coverage area
• Triggered by the measurement event 1A
• HSDPA mobility handling with DCH switching applies DCH X/X allocation
• Based on the measurement events 1F and 6A• To initial bitrates with Direct HS-DSCH to DCH switch
• UL DCH quality deterioration report can be used to control HSDPA mobility
• In the case of an AMR multi-service, DL Transmitted Code Power measurementis used as a trigger to initiate inter-frequency measurements
• HS-DSCH MAC-d flow is released before transition to the CELL_FACH state orallocation of initial bitrates with Direct HS-DSCH to DCH switch
Measurement reporting and HSDPA cell reselectionand DCH switching
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Soc Classification level
Event
Description Actions on HSDPA
1A A primary CPICH enters the
reporting range.
Trigger HS-DSCH release and transition to the
CELL_FACH state
1F A primary CPICH goes below
the absolute threshold.
Trigger for releasing the HS-DSCH MAC-d flow
and allocation of DCH X/X (0/0 or initial
bitrates with Direct HS-DSCH to DCH switch)
+ for AMR multi-RAB inter-frequency/-RAT
measurements
6A UE Tx power exceeds the
absolute threshold.
Uplink quality deteriorationreport (in RNC)
DL transmitted code power >
limit
For AMR multi-RAB Trigger for releasing the HS-
DSCH MAC-d flow and allocation of DCH X/X
(0/0 or initial bitrates with Direct HS-DSCH to
DCH switch) and starting inter-frequency/-RAT
measurements
HSDPA cell reselection
T ll ( ll i h
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Soc Classification level
• Target cell (cell with
best CPICH Ec/No in
the measurement set)
informed in the RB
reconfiguration
message, when UE is
commanded to
cell_FACH
• There is no need for cell
reselection incell_FACH, as the UE
goes directly to
strongest cell in
cell_FACH
Scrambling code of the strongest cell
in the measured set informed to UE.
HSDPA cell reselection details
HSDPA S i C ll Ch i C ll FACH f t i d l i i t
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Soc Classification level
• HSDPA Serving Cell Change via Cell-FACH feature is used only in intra
frequency handover cases, in case of IFHO or ISHO the original DCH switching
procedures are used• If the user was moved to Cell-FACH because of intra frequency handover no
HSDPA user penalty timers are used on Cell-FACH, the user will be immediately
switched to a new HSDPA connection when there is a data volume request either
from the UE or RNC
• If the user was moved to Cell-FACH because of low throughput then the HSDPA
penalty timers are used on Cell-FACH
• If the HSDPA user moves to non-HSDPA cell, the user in HO area will be moved
to Cell-FACH. The user will be immediately switched to the DCH of the
requested bit rate when there is a data volume request either from the UE or
RNC (no need for first DCH0/0DCH Initial bit rateDCH Final bit rate)
HSDPA cell reselection Parameters
Addition Window (HSDPA FMCS) = 0dBAddition Time (HSDPA FMCS) = 1280ms
EcNo Filter coefficient (HSDPA FMCS) = 800ms
Enable RRC release (HSDPA HOPS) = enabled
Release Margin Average EcNo (HSDPA HOPS) = 2dB
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time
Ec /No
CPICH 2
HSDPA A ddit ion Time
MeasurementReports (1A)
HSDPA
Addi t ionWindow
CPICH 1
HSDPA CELL_FACH
Release Margin Average EcNo (HSDPA HOPS) = 2dB
Release Margin Peak EcNo (HSDPA HOPS) = 3.5 dB
EcNo Averaging Window (HSDPA HOPS) = 8
ReleaseMarginAverageE
cNo
ReleaseMarginPeakEcNo
Reconfigurationto Cell_FACH
HSDPA
Discouraging SHO during Connection Establishment
HSDPARRCdiversity
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• Where,
MeasNew is the Ec/No measurement result of the cell entering the reporting range
MeasCell is the Ec/No measurement result of the serving cell
MeasAveNew is the averaged Ec/No measurement result of the cell entering the reporting rangeMeasAveCell is the averaged Ec/No measurement result of the serving cell
ReleaseMarginPeakEcNo and ReleaseMarginAveEcNo are parameters defined in the HSDPA
HOPS
o) ginPeakEcN ReleaseMar Meas Meas Cell New (
• This parameter defines which set of thresholds are applied for soft handover during
connection establishment while a UE has a standalone SRB
• If the measurement event 1A is triggered and the reported CPICH Ec/No of the enteredcell fulfils either one of the equations below, active set update is allowed despite the value
of the parameter HSDPARRCdiversity
)ginAveEcNoReleaseMar MeasAve(MeasAve Cell New
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Directed RRC connection setup for HSDPA layer
• This feature is meant for multi layer networks where high speed downlink packet
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• This feature is meant for multi layer networks where high speed downlink packetaccess (HSDPA) is supported in some layer(s) (carrier frequency)
• The primary target of this feature is to• Direct the HSDPA capable UEs to the layer that supports HSDPA
• If several HSDPA capable layers exist the HSDPA load balancing between these layers isutilized.
• Remove non-HSDPA UE from HSDPA layer(s)
• Feature works inside BTS between cells of same sector• Same Sector ID, PtxPrimaryCPICH, CPICHtoRefRABoffset, PLMN code (MCC +
MNC )
f1, Rel’99f1, Rel’99
f2, HSDPA + Rel’99f2, HSDPA + Rel’99
Rel’99 and Rel-4 UE
andRel-6 or newer non-HSDPA capable UE
Rel-5 UE
andRel-6 or newer HSDPAcapable UE
Signalling and sector
• Directed RRC connection set up for
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• Directed RRC connection set up for
HSDPA layer
• When UE initiates the RRC connection
setup, it indicates
• 3GPP release it supports (access
stratum release indicator IE )
• Rel-4, Rel-5, Rel-6, … • Rel-6 UE indicates if it supports HSDPA
and HSUPA (UE capability indication
IE )
• The service UE is going to use
(Establishment cause IE )
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Basic functionality
• Basic functionality is selected when the DirectedRRCForHSDPALayerEnhanc
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Basic functionality is selected when the DirectedRRCForHSDPALayerEnhanc
management parameter is set to ‘Disabled’
• 3GPP release 5 or newer UEs are directed from non-HSDPA supporting cell to
the cell, which supports HSDPA
• 3GPP release 99 or release 4 UEs are directed from HSDPA supporting cell to
the cell, which does not support HSDPA
• Load of target cell is not taken into account
• With basic functionality the Directed RRC connection setup for HSDPA layer
cannot be used simultaneously in the cell with Directed RRC connection setup
feature
Enhanced functionality
• Enhanced functionality is selected when the
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Enhanced functionality is selected when the
DirectedRRCForHSDPALayerEnhanc management parameter is set to ‘Enabled’
• Enhancement of Directed RRC connection setup for HSDPA layer
• The service indicated by UE in RRC connection request is taken into account
• The services are defined with DRRCForHSDPALayerServices parameter
• More than 2 layers are supported
• Target cell load checking and HSDPA load balancing
• Simultaneous use of Directed RRC Connection Setup and Directed RRC Connection
Setup for HSDPA layer is supported
• UE capability indication IE (coming in RRC Connection Request message) is used in
decision making for Rel-6 and onwards UEs
• Separate only DCH, HSDPA and HSUPA capable Rel-6 UEs
Decision to change the layer
• Non HSDPA UEs (R99 or R4, R6 without HSDPA) are directed away from HSDPA
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( ) ycapable cell
• If load of the target cell is not too big
• HSDPA UEs (R5 or R6 with HSDPA) are directed away from non-HSDPA capable cell
• If establishment cause indicated by the UE is activated with DRRCForHSDPALayerServices parameter
• If maximum number of HS-DSCH users is not reached in target cell
• If several target layer candidates exists the HSDPA load balancing is applied
• HSDPA UEs (R5 or R6 with HSDPA) are directed to another HSDPA capable cell
• For load balancing reasons
• If establishment cause indicated by the UE is activated with DRRCForHSDPALayerServices parameter
• HSUPA capable UE (R6 with HSDPA/HSUPA)
• As for HSDPA capable UE
• HSUPA capable UE is directed to HSUPA capable cell if possible
• HSUPA capable UE is not directed away from HSUPA capable cell
Directed RRC connection setup in non-HSPA layer
Decision making
UE reporting Rel-6
HSDPA & HSUPA capability
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1. UE HSPA capability = cell HSPAcapability (f1)
A Yes -> current layer (f1)
B&C No -> f2 & f3
2. Establishment cause =DRRCForHSDPALayerServices
B&C No -> current layer (f1)
B&C Yes -> f2 & f3
3. UE HSPA capability = target cellHSPA capability (f2 & f3)
B -> f2 & f3
C -> f3
4. Better available HSDPAthroughput
B -> f2 or f3
f1, R´99
f2, HSDPA
f3, HSDPA&HSUPA
A
B
UE reporting Rel5 or
Rel-6 & HSDPA capability
Any other UE
C
Directed RRC connection setup in HSDPA/HSPAlayer
Decision making
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1. UE HSDPA capability = cell HSDPA
capability (f2/f3)
A No -> f1
B&C No -> f2 & f3
2. Establishment cause =
DRRCForHSDPALayerServices
B&C No -> current layer (f2/f3)
B&C Yes -> f2 & f3
3. UE HSUPA capability = cell HSUPAcapability (f2 & f3)
B -> f2 & f3
C -> f3
4. Better available HSDPA throughput (for
interactive and background
Establishment cause)
B -> f2 or f3f1, R´99
f2, HSDPA
f3, HSDPA&HSUPA
A
B
UE reporting Rel5 or
Rel-6 & HSDPA capability
Any other UE
UE reporting Rel-6
HSDPA & HSUPA capability
C
HSDPA load balancing
• HSDPA load balancing is used when there are two or more layers that support
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g y pp
HSDPA
• HSDPALayerLoadShareThreshold defines threshold for number of HSDPA UEsrequired to trigger load balancing
• If #UEs > HSDPALayerLoadShareThreshold in a cell in sector
• HSDPA UEs are directed to different HSDPA layers to balance available power per
HSDPA user• CellWeightForHSDPALayering parameter can be used to direct more HSDPA UEs to
selected layer
• If # UEs < HSDPALayerLoadShareThreshold in all cells in sector
• HSDPA UEs are directed to same HSDPA layer
• The cell which CellWeightForHSDPALayering has biggest value is chosen
HSDPA load balancing (under threshold)
Number of HS-DSCH users in the cell in the decision making moment
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Cell which has
1. highest cell weight
(CellWeightForHSDPALayering )
2. number of HS-DSCH users is
highest
shall be selected.
Cell
f1
g
Max
0
HSDPALayerLoadShareThreshold
Cell
f2
Cell
f3
HSDPA load balancing (over threshold)
Number of HS-DSCH users in the cell in the decision making moment
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Cell which has
1. highest cell weight
(CellWeightForHSDPALayering )
2. number of HS-DSCH
users is highest
shall be selected.
Cell
f1
Max
0
HSDPALayerLoadShareThreshold
Cell
f2
Cell
f3
Cell which has highest
HSDPA power per
user available shall be
selected
HSDPA load balancing (HSDPA power per user)
Operator parameterPmax
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1
*
DPAusers NumberOfHS
yering ForHSDPALaCellWeight PtxNonHSPA P PerUser HSDPApower Max
(Range 0.01 … 1)
Number of HSDPA usersactive in the cell
A cell with highest available HSDPA power per user shall be selected.
HSPA
power
Non
HSPA
power
Cell
PtxNonHSPA
max
0
Interworking with Directed RRC connection setupfeature
(Both parameters DirectedRRCEnabled and DirectedRRCForHSDPAEnabled are enabled.)
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• The decision of directed RRC connection setup for HSDPA layer is done first:
Decision = Change layer: Directed RRC connection setup for HSDPA layer is done
Decision = Do not change layer: The decision of directed RRC connection setup is done
• If several candidates exist (more than 2 layers) for Directed RRC connection setup UE is
tried to keep in most suitable layer from capability point of view.
• Non-HSDPA capable UE -> non-HSDPA capable cell
• HSDPA capable UE -> HSDPA or HSDPA&HSUPA capable cell
• HSDPA&HSUPA capable UE -> HSDPA&HSUPA capable cell is preferred and HSDPAcapable is next preferred.
• HSDPA/HSPA capable UEs in Directed RRC connection setup
• are not transferred away from HSDPA/HSPA layer if they are requesting interactive or
background service.
• can be transferred away from HSDPA/HSPA layer if they are requesting other than interactive
or background service.
Parameters
• DirectedRRCForHSDPALayerEnabled
• Range and step: 0 (Disabled) 1 (Enabled) Default value: 0 Object:WCEL
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• Range and step: 0 (Disabled), 1 (Enabled), Default value: 0, Object:WCEL
• DirectedRRCForHSDPALayerEnhanc
• Range and step: 0 (Disabled), 1 (Enabled), Default value: 0, Object:WCEL• DRRCForHSDPALayerServices
• Range and step:
• Bit 0: Conversational Call , Bit 1: Streaming Call , Bit 2: Interactive Call , Bit 3: Background Call , Bit 4: Subscribed trafficCall , Bit 5: Emergency Call , Bit 6: Inter-RAT cell re-selection , Bit 7: Inter-RAT cell change order , Bit 8: Registration , Bit9: High Priority Signalling , Bit 10: Low Priority Signalling , Bit 11: Call re-establishment , Bit 12: Terminating – causeunknown , Bit 13: MBMS reception , Bit 14: MBMS ptp RB request , Bit 15: Other
• Default value: 204 (11001100)
• In default the Directed RRC connection setup for HSDPA layer is done only for Interactive and Background calls, Inter-RAT cell re-selections and Inter-RAT cell change order.
• Object:RNC
• HSDPALayerLoadShareThreshold
• Range and step: 0..48, step 1, Default value: 3, Object:RNC
• CellWeightForHSDPALayering
• Range and step: 0.01..1, step 0.01, Default value: 1, Object:WCEL
• DirectedRRCEnabled• Range and step: 0 (Disabled), 1 (Enabled), Default value: 1, Object:WCEL
Module Contents
• HSDPA resource handling
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• Channel type switching
• HSDPA mobility handling• HSDPA mobility handling with the Serving HS-DSCH Cell Change
• Measurement control and handover path parameters
• HSDPA cell reselection
• Directed RRC connection setup for HSDPA layer
• HSPA layering for UEs in common channels
• HSDPA channel type selection
• HSDPA with additional RAB initiation
• HSDPA associated uplink DPCH scheduling
• HSDPA code multiplexing
HSPA layering for UEs in common channels
• HSPA layering for UEs in common channels is triggered in transition from
CELL FACH t CELL DCH t t
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CELL_FACH to CELL_DCH state
• Complements directed RRC connection setup for HSDPA feature
• The primary target of this feature is to
• Direct the HSDPA UEs to the cell that supports HSDPA
• If several HSDPA capable layers exist the HSDPA load balancing between these layers is
utilized
• Remove non-HSDPA UEs from HSDPA layer(s)
• Feature works inside BTS between cell of same sector
• Same Sector ID, PtxPrimaryCPICH, CPICHtoRefRABoffset, PLMN code (MCC +
MNC )
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Decision to change the layer
• Non HSDPA UEs (R99 or R4, R6 without HSDPA) are directed away from HSDPA
capable cell
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capable cell
• If load of the target cell is not too big
• HSDPA UEs (R5 or R6 with HSDPA) are directed away from non-HSDPA capable cell
• If operation is allowed for RAB type (CS/PS) defined with ServicesToHSDPALayer parameter
• If maximum number of HS-DSCH users is not reached in target cell
• If several candidates exists the HSDPA load balancing is applied
• HSDPA UEs (R5 or R6 with HSDPA) are directed to another HSDPA capable cell
• For load balancing reasons
• UE is requesting interactive or background service
• HSUPA capable UE (R6 with HSDPA/HSUPA)
• As for HSDPA capable UE
• HSUPA capable UE is directed to HSUPA capable cell if possible
• HSUPA capable UE is not directed away from HSUPA capable cell
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Parameters
• HSDPALayeringCommonChEnabled
R d t 0 (Di bl d) 1 (E bl d) D f lt l 0 Obj t WCEL
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• Range and step: 0 (Disabled), 1 (Enabled), Default value: 0, Object:WCEL
• ServicesToHSDPALayer
• Range and step: 0 (Any type of service is requested), 1 (NRT PS RAB is requested),
Default value: 0, Object:RNC
Module Contents
• HSDPA resource handling
Ch l t it hi
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• Channel type switching
• HSDPA mobility handling
• HSDPA channel type selection
• HSDPA with additional RAB initiation
• HSDPA associated uplink DPCH scheduling
• HSDPA code multiplexing
HSDPA channel type selection
• The HSDPA channel type selection feature determines the optimal downlink
transport channel for the user (FACH DCH or HS-DSCH)
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transport channel for the user (FACH, DCH or HS DSCH)
• The UE-specific packet scheduler (PS) performs the channel selection• Triggered by capacity request (UL/DL)
Selection between DCH and HS-DSCH
HS-DSCH is selected if all of the following conditions are met:1. Traffic class and traffic handling priority are allowed on HS-DSCH
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• The operator can configure which traffic classes and handling priorities are allowed to be used with HSDPA withHSDSCHQoSclasses parameter.
2. UE capability supports HS-DSCH3. The cell supports HSDPA and HS-DSCH is enabled in the cell
4. Multi-RAB combination of the UE is supported with HS-DSCH• The only allowed combination is 1 AMR voice CS RAB + 1 Interactive/Background class service PS RAB. This multi-RAB is
supported if operator has enabled the parameter AMRWithHSDSCH .
5. The number of simultaneous HS-DSCH allocations in the BTS/cell is below the maximum number• 16/BTS, 16/cell, 16/cell group, 48/cell group or 48/cell
6. HsdschGuardTimerHO and HsdschGuardTimerLowThroughput guard timers are not running for that UE
• Both guard timers are operator-configurable parameters7. UE is not performing inter-frequency or inter-system measurements
8. Active set size = 1 (if HSDPAMobility is disabled)
9. UE does not have DCHs scheduled with bit rates higher than 0kbps ??
10. HS-DSCH physical layer category is supported
11. When HSDPA Dynamic Resource Allocation is disabled and if there is no existing MAC-d flow in the cell, condition(A or B, depending on the HSDPApriority parameter) has to be valid. A) PtxNC <=PtxtargetHSDPA
B) Ptxtotal <=PtxtargetHSDPA
Release of DL HS-DSCH MAC-d flow and UL DCH / E-DCH
L3 starts procedure to release UL NRT DCH and MAC-d flow if:
• MAC-d flow has low utilization and UL NRT DCH can be released (Packet
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UE moved to Cell FACH
(
scheduler) / UL NRT E-DCH can be released (HSUPA)
Or
• MAC-d flow has low throughput and UL NRT DCH can be released (Packet
scheduler) / UL NRT E-DCH can be released (HSUPA)
• In this case UE specific timer HsdschGuardTimerLowThroughput is started.
If MAC-d flow has both low utilization and low throughput conditions valid at
the same time, the functionality described in case of low utilization is
followed
HS-DSCH & associated
DCHs released
AMR call + NRT DCH 0/0
Parameters
• HSDSCHQoSclasses
• Range and step: Bit 0: Background , Bit 1: Interactive THP=3 , Bit 2: Interactive THP=2 , Bit 3:
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Interactive THP=1, Default value: 15, Object:RNC
• AMRWithHSDSCH• Range and step: 0 (Disabled), 1 (Enabled), Default value: 0, Object:RNC
• HsdschGuardTimerHO
• Range and step: 0..30 s, step 1 s, Default value: 5 s, Object:RNC
• HsdschGuardTimerLowThroughput
• Range and step: 0..240 s, step 1 s, Default value: 30 s, Object:RNC
• MACdflowthroughputAveWin
• Range and step: 0..10 s, step 0.5 s Default value: 3 s, Object:RNC
• MACdflowutilRelThr
• Range and step: 0..64000 bps, step 256 bps, Default value: 256 bps, Object:RNC
• MACdflowthroughputRelThr
• Range and step: 0..64000 bps, step 256 bps Default value: 0 bps, Object:RNC
Module Contents
• HSDPA resource handling
• Channel type switching
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• Channel type switching
• HSDPA mobility handling• HSDPA channel type selection
• HSDPA with additional RAB initiation
• HSDPA associated uplink DPCH scheduling
• HSDPA code multiplexing
HSDPA with additional RAB initiation
• The multi-RAB combination ‘AMR + Interactive/Background PS RAB’ is
supported simultaneously with the HS-DSCH transport channel
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pp y p
• Operator chooses the usage of this combination by enabling the
AMRWithHSDSCH parameter (optional feature)
Sector inf o
AMR call (UL&DL)
PS: HS-DSCH (DL)
PS: DCH (UL)
HSDPA in DL, DCH (return channel) in UL
AMRspeech call in UL&DL
Sector inf o
AMR call (UL&DL)
PS: HS-DSCH (DL)
PS: DCH (UL)
HSDPA in DL, DCH (return channel) in UL
AMRspeech call in UL&DL
HSDPA suspension
• HSDPA is suspended for the duration of the AMR multi-call, if the parameter
AMRWithHSDSCH is set to disabled
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• For other multi-call combinations, the suspension is always applied
• With direct HS-DSCH to DCH switch it is possible that DCH with initial bit rate is
reserved directly after suspension
bit
rate HS-DSCH
time
DCH
After HSDPA issuspended, DCH packetscheduling procedurescan be applied -> if still
enough data in buffer,DCH is allocated
bit
rate HS-DSCH
time
DCH
After HSDPA issuspended, DCH packetscheduling procedurescan be applied -> if still
enough data in buffer,DCH is allocated
Non-supported
RAB combination
for HSDPA setup ->
HSDPA is suspended
bit
rate HS-DSCH
time
DCH
After HSDPA issuspended, DCH packetscheduling procedurescan be applied -> if still
enough data in buffer,DCH is allocated
bit
rate HS-DSCH
time
DCH
After HSDPA issuspended, DCH packetscheduling procedurescan be applied -> if still
enough data in buffer,DCH is allocated
Non-supported
RAB combination
for HSDPA setup ->
HSDPA is suspended
Module Contents
• HSDPA resource handling
• Channel type switching
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Channel type switching
• HSDPA mobility handling• HSDPA channel type selection
• HSDPA with additional RAB initiation
• HSDPA associated uplink DPCH scheduling
• HSDPA code multiplexing
HSDPA associated uplink DPCH channel
• When the radio bearer is mapped onto HS-DSCH transport channel in downlink,
either E-DCH or DCH is allocated in uplink as a return channel
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• Supported data rates for UL DCH return channel are 16, 64, 128 and 384 kbit/s
• 16 kbps UL DCH return channel is an optional feature, which can be activated by the
operator with the management parameter HSDPA16KBPSReturnChannel
• Minimum allowed bit rate with HSDPAminAllowedBitrateUL parameter
• Not limited by BitRateSetPSNRT
PS: HS-DSCH (DL)
PS: DCH (UL)
PS: HS-DSCH (DL)
PS: DCH (UL)
HSDPA associated uplink DPCH scheduling
• If the HS-DSCH allocation is triggered by uplink, normal NRT DCH schedulingrules are applied
f ff ff C
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• If the traffic volume measurement indicates High traffic volume, the RNC attempts to
allocate a return channel with the highest possible bit rate• TrafVolThresholdULHigh parameter
• If the traffic volume measurement indicates Low traffic volume, the RNC attempts toallocate a return channel with configured initial bit rate
• HSDPAinitialBitrateUL parameter
• If the HS-DSCH allocation is triggered by downlink, the RNC attempts to allocate
the uplink with the HSDPAinitialBitrateUL parameter• In the case of direct DCH to HS-DSCH switch, the HSDPA UL DCH bit rate can
be same as existing DCH UL bit rate
• If even initial bit rate or higher can not be allocated, HS-DSCH allocation is notpossible
DL/UL DCH is scheduled to the UE
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Example use case 1: HSDPA UL DCH with initial bitrate 64 kbps
• The initial bit rate (HSDPAinitialBitrateUL) is set to 64 kbps. The minimum bit rate
is set to 16 kbps (HSDPAminAllowedBitrateUL)
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64
kbps
384
128
t
0
Capacity
Request
(Traf.vol
measurement
low)
Initial bitrate
64 kbps
Decrease of the
retried NRT DCH
bitrate
Priority based
scheduling/
RT-over-NRT
Minimum bitrate
16 kbps
Capacity
Request
(Traf.vol
measurement
high)
Capacity
Request
(Traf.vol
measurement
high)
t1
t2
t3
t5
16
t4
Example use case 2: Initial bit rate 128 kbps
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Parameters
• HSDPA16KBPSReturnChannel
• Range and step: 0 (Disabled), 1 (Enabled), Default value: 0, Object:RNC
• HSDPAminAllowedBitrateUL
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• Range and step: 1 (16 kbps), 3 (64 kbps), 4 (128 kbps), 6 (384 kbps), Default value: 3 , Object:RNC
• BitRateSetPSNRT
• Range and step: 0 (Predefined bit rate set is not in use = All supported bit rates are in use), 1 (Predefined bitrate set is in use), Default value: 0, Object:RNC
• TrafVolThresholdULHigh
• Range and step: 0 (8 bytes), 1 (16 bytes), 2 (32 bytes), 3 (64 bytes), 4 (128 bytes), 5 (256 bytes), 6 (512bytes), 7 (1024 bytes. 1 KB), 8 (2048 bytes. 2 KB), 9 (3072 bytes. 3 KB), 10 (4096 bytes. 4 KB), 11 (6144bytes. 6 KB), 12 (8192 bytes. 8KB), 13 (12288 bytes. 12 KB), 14 (16384 bytes. 16 KB), 15 (24576 bytes. 24
KB), Default value: 7, Object:RNC
• TrafVolThresholdULLow
• Range and step: 8 (8 bytes), 16 (16 bytes), 32 (32 bytes), 64 (64 bytes), 128 (128 bytes), 256 (256 bytes), 512(512 bytes), 1024 (1 KB) Default value: 128, Object:RNC
• HSDPAinitialBitrateUL
• Range and step: 1 (16 kbps), 3 (64 kbps), 4 (128 kbps), 6 (384 kbps), Default value: 3, Object:RNC
• DynUsageHSDPAReturnChannel
• Range and step: 0 (Off), 1 (On), Default value: 0, Object:RNC
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HSDPA Code Multiplexing
• Optional feature HSDPA Code Multiplexing enables simultaneous transmission of
(max) three HSDPA users within a single cell during a single Transmission Time
Interval (TTI)
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Interval (TTI)
• HSDPA Code Multiplexing is activated in RNC by giving to cell level RNP parameter
MaxNbrOfHSSCCHCodes value that is bigger than 1
• Each multiplexed HSDPA user needs own HS-SCCH code
• This feature can not be used without HSDPA 10 Codes or HSDPA 15 Codes
feature• Nokia RAN uses at least 3 HS-PDSCH codes per one multiplexed HSDPA user
Two multiplexed users needs 6 HS-PDSCH codes and that is not supported by basic
HSDPA functionality
48 simultaneous HSDPA users per cell
• This feature makes it possible to have 48 simultaneous HSDPA users in one cell
• Maximum number of HSDPA users depends on also configuration of BTS
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• Depending on activated features and BTS configuration the maximum is
• 16 per cell
• 16 per cell group
• 48 per cell group
• 48 per cell
• A cell group builds up from those cells that are controlled by same MAC-HSscheduler in BTS
• HSDPA 48 Users per Cell is activated with the RNC level RNP parameter
HSDPA48UsersEnabled
• Sensible Iub and BTS baseband dimensioning requires that also feature 16 kbit/s
Return Channel DCH Data Rate Support for HSDPA is in use
Parameters
• MaxNbrOfHSSCCHCodes
• Range and step: 1..3, step 1, Default value: 1, Object:WCEL
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• HSDPA48UsersEnabled
• Range and step: 0 (Not in use), 1 (In use) Default value: 0, Object:RNC
Module 4 –
Summary
Summary
Radio resource management for HSDPA consists many
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functions:• HSDPA resource handling
• Channel type switching
• HSDPA mobility handling
• HSDPA channel type selection
• HSDPA with additional RAB initiation
• HSDPA associated uplink DPCH scheduling
ANNEX –
RAS05.1 RAS06
• Removed features and parameters
• Resumption timer
RAS06 BTS 0 dB f t i
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• RAS06 BTS uses 0 dB power safety margin