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Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
HSDPA RRM and
Parameters
ISSUE 1.0
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Contents
1. HSDPA Channel Type Mapping
2. HSDPA Code Resource Allocation
3. HSDPA Power Allocation
4. HSDPA Power Control
5. HSDPA Mobility Management
6. HSDPA Scheduling Algorithm
7. HSDPA Flow Control
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HSDPA Channel Mapping
Interactive, Background and Streaming service could be mapped ontoHS-DSCH
The bit rate thresholds are used
RAB with maximum bit rate higher than or equal to the threshold willbe mapped onto HS-DSCH
The bit rate thresholds (DL streaming threshold on HSDPA , DL BE
traffic threshold on HSDPA) are OM configurable
One switch (PS_STREAMING_ON_HSDPA_SWITCH) is available foroperator to disable the mapping of streaming service onto HS-DSCH
Interactive
Background
Streaming
mapping RB on DCH
RB on HS-DSCH
RB on FACH
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HSDPA Channel Mapping Parameters
Parameter Name PS_STREAMING_ON_HSDPA_SWITCH
Parameter ID PS_STREAMING_ON_HSDPA_SWITCH
GUI Range 0, 1
Physical Range & Unit Not checked, checked
Default Value 0
Optional/Mandatory Mandatory
MML Command SET CORRMALGOSWITCH
Description:
When it is checked, the PS streaming service can be mapped onto HS-DSCH whenthe downlink max bit rate is more than or equal to DL streaming thresho ld on
HSDPA.
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HSDPA Channel Mapping Parameters
Parameter Name DL streaming threshold on HSDPA
Parameter ID DlStrThsonHsdpa
GUI Range D8, D16, D32, D64, D128, D144, D256
Physical Range & Unit 8, 16, 32, 64, 128, 144, 256 (kbit/s)
Default Value D64
Optional/Mandatory Mandatory
MML Command SET FRC
Description:
The rate decision threshold of the DL PS streaming service to be carried on HS-DSCH. When the maximum DL service rate is greater than or equal to this threshold,
the service will be carried on HS-DSCH; otherwise, on DCH.
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HSDPA Channel Mapping Parameters
Parameter Name DL BE traff ic thresho ld on HSDPA
Parameter ID DlBeTraffThsOnHsdpa
GUI RangeD8, D16, D32, D64, D128, D144, D256, D384,
D768, D1024, D1536, D2048
Physical Range & Unit8, 16, 32, 64, 128, 144, 256, 384, 768, 1024,
1536, 2048 (kbit/s)Default Value D8
Optional/Mandatory Mandatory
MML Command SET FRC
Description:
The rate decision threshold of the DL PS background or interactive service to becarried on HS-DSCH. When the maximum DL service rate is greater than or equal to
this threshold, the service will be carried on HS-DSCH; otherwise, on DCH.
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Contents
1. HSDPA Channel Type Mapping
2. HSDPA Code Resou rce Alloc at ion
3. HSDPA Power Allocation
4. HSDPA Power Control
5. HSDPA Mobility Management
6. HSDPA Scheduling Algorithm
7. HSDPA Flow Control
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HSDPA Code Resource Allocation
The codes of the HS-PDSCH physical channel can be
allocated in three ways:
Static HSDPA code allocation
RNC-controlled dynamic allocation
NodeB-controlled dynamic allocation
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HSDPA Code Resource Allocation
Static HSDPA Code Allocation
Static HS-PDSCH code allocation
Spreading factor =16
Allocate continuously
Static HS-SCCH code allocation
Spreading factor =128
Allocate with common channel
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HSDPA Code Resource Allocation
RNC-controlled dynamic allocation In the RNC-controlled dynamic allocation, the RNC adjusts the reserved HS-
PDSCH codes according to the real-time usage status of the codes
Configure the maximum and minimum numbers of codes available for HS-
PDSCH on the RNC LMT. The codes between the two parameters are called
shared codes
The RNC periodically monitors how the code resource is used and decides to
extend or reduce the codes reserved for the HS-PDSCH
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HSDPA Code Resource Allocation
When allocating the code resource triggered by radio link setup orradio link deletion, the RNC will extend the codes reserved for the HS-
PDSCH if the following cases are fulfilled:
If in cell's code tree there is at least one code can be reserved and this
code's SF is equal to or less than the Cell SF reserved threshold, NodeB
will try to increase HS-PDSCH code number
Among shared codes, the code which neighbors to the reserved codes for
the HS-PDSCH is idle, which can be attained by reshuffling the cell code
resource
* the solid dots represent the occupied codes and the circles represent the idle codes
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HSDPA Code Resource Allocation
Reducing the Codes Reserved for HS-PDSCH
When allocating the code resources triggered by radio link setup, the RNC
will reallocate one of the shared codes reserved for HS-PDSCH to DPCH if
the minimum SF among free codes is larger than the Cell SF reserved
threshold.
The code number of the reallocated code should be the minimum.
* the solid dots represent the occupied codes and the circles represent the idle codes
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Code Allocation Parameters
Parameter Name Code Number for HS-SCCH
Parameter ID HSSCCHCODENUM
GUI Range 115
Physical Range & Unit 115 Unit: code
Default Value 4
Optional/Mandatory Mandatory
MML Command ADD CELLHSDPA
Description:
This parameter sets the number of HS-SCCH codes available in a cell.
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Code Allocation Parameters
Parameter Name Al locate Code Mode
Parameter ID ALLOCCODEMODE
GUI Range Manual, Automatic.
Physical Range & UnitStatic Allocation, RNC-Controlled Dynamic
Allocation.
Default Value RNC-Controlled Dynamic Allocation
Optional/Mandatory Mandatory
MML Command ADD CELLHSDPA
Description:This parameter is used to choose the mode of allocating HS-PDSCH codes in the
RNC. There are two modes: static and dynamic
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Code Allocation Parameters
Parameter Name Code Num ber for HS-PDSCH
Parameter ID HSPDSCHCODENUM
GUI Range 115
Physical Range & Unit 115 Unit: code
Default Value 5
Optional/Mandatory Mandatory
MML Command ADD CELLHSDPA
Description:
This parameter sets the number of HS-PDSCH codes available in a cell.
This parameter is valid only when Al locate Code Modeis set to Manual
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Code Allocation Parameters
Parameter Name Code Max Number for HS-PDSCH
Parameter ID HSPDSCHMAXCODENUM
GUI Range 115
Physical Range & Unit 115 Unit: code
Default Value 10
Optional/Mandatory Mandatory
MML Command ADD CELLHSDPA
Description:This parameter sets the maximum number of HS-PDSCH codes available in a cell
This parameter is valid only when Al locate Code Mode is set toAutomat ic
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Code Allocation Parameters
Parameter Name Code Min Num ber for HS-PDSCH
Parameter ID HSPDSCHMAXCODENUM
GUI Range 115
Physical Range & Unit115
Unit: code
Default Value 5
Optional/Mandatory Mandatory
MML Command ADD CELLHSDPA
Description:
This parameter sets the maximum number of HS-PDSCH codes available in a cell
This parameter is valid only when Al locate Code Mode is set toAutomat ic
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HSDPA Code Resource Allocation
NodeB-controlled dynamic allocation
NodeB-controlled dynamic allocation allows the NodeB to use the HS-
PDSCH codes that are statically allocated by the RNC. Besides, the
NodeB can dynamically allocate the idle codes of the current cell to
the HS-PDSCH channel
The NodeB periodically detects the SF16 codes apart from the RNC-
allocated HS-PDSCH codes every 2 ms. If the codes or sub-codes are
allocated by the RNC to the DCH or common channels, they are
identified as occupied. Otherwise, they are identified as unoccupied.
Therefore, the HS-PDSCH codes available for the HS-PDSCH
channel include the codes allocated by the RNC and those
consecutive and unoccupied SF16 codes
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HSDPA Code Resource Allocation
NodeB-controlled dynamic allocation
For example, if the RNC allocates five codes to the NodeB, that is,
No.11 to 15 SF16 codes are allocated to the HS-PDSCH. Suppose in
a 2 ms TTI, No. 0 to 5 SF16 codes are allocated to the DCH and
common channels. No. 0 to 5 SF16 codes are occupied. Therefore, in
the current TTI, the HS-PDSCH can use No. 6 to 15 SF16 codes
If the DCH codes allocated by the RNC are temporarily occupied by
the HS-PDSCH during the setup of radio links, the NBAP message
returned to the RNC indicates that the radio link is set up successfully.
From the next 2 ms TTI, the HS-PDSCH no longer uses these codes
until they are released from the DCH
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Code Allocation Parameters
Parameter Name Dynamic cod es al locat ion switch
Parameter ID DYNCODESW
GUI Range OPEN, CLOSE
Physical Range & Unit OPEN, CLOSE
Default Value OPEN
Optional/Mandatory Mandatory
MML Command SET MACHSPARA
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Contents
1. HSDPA Channel Type Mapping
2. HSDPA Code Resource Allocation
3. HSDPA Power A l location
4. HSDPA Power Control
5. HSDPA Mobility Management
6. HSDPA Scheduling Algorithm
7. HSDPA Flow Control
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HSDPA Power Allocation
HS-PDSCH and HS-SCCH shared power with R99
channels
DPCHs have the preferential right to occupy the power
NodeB can use all the remaining power for HSDPA
A configurable margin is used to keep the system in stable status
Time
Allowed power for HSDPA
Total Power
DPCH
Power for CCH
Higher
power utility
efficiency
Time
Power margin for DCH
power control
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HSDPA Power Allocation Parameters
Parameter Name HS-PDSCH, HS-SCCH, E-AGCH, E-RGCH and E-HICH Total Power
Parameter ID HSPAPOWER
GUI Range 0500
Physical Range & Unit0 dBm50 dBm
Unit: 0.1 dBm
Default Value 430 (43 dBm)
Optional/Mandatory Mandatory
MML Command SET MACHSPARA
Description:This parameter sets the maximum available power for HS-PDSCH, HS-SCCH, E-
AGCH, E-RGCH and E-HICH.
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HSDPA Power Allocation Parameters
Parameter Name Power Margin
Parameter ID PWRMGN
GUI Range 0100
Physical Range & Unit Percent %
Default Value 10
Optional/Mandatory Mandatory
MML Command SET MACHSPARA
Description:
Power margin for R99 power control in one TTI
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HSDPA Power Allocation Parameters
Parameter Name Max Power per H user
Parameter ID MXPWRPHUSR
GUI Range 1100
Physical Range & Unit1%~100%
Unit:1%
Default Value 100
Optional/Mandatory Mandatory
MML Command SET MACHSPARA
Description:The power of each HSDPA user in one TTI will be limited by this parameter value
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Contents
1. HSDPA Channel Type Mapping
2. HSDPA Code Resource Allocation
3. HSDPA Power Allocation
4. HSDPA Power Contro l
5. HSDPA Mobility Management
6. HSDPA Scheduling Algorithm
7. HSDPA Flow Control
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HSDPA Power Control
HS-DPCCH Power Control Power Offset of ACK, NACK and CQI (Non SHO & SHO)
There is no separate power control for HS-DPCCH but setting
several power offsets between HS-DPCCH and UL associated
DPCCH.
ACK / NACKCQI
/ NACK ACK CQI
Time
Power
Power
Uplink DPCCH
Time
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HSDPA Power Control
HS-DPCCH Power Control
In soft handover area, the UL combining gain reduces the
necessary transmission power of UL DPCCH. While HS-
DPCCH does not has the UL combining gain, to maintain the
receiving quality of the HS-DPCCH, higher power offset is
needed. Thus, when UE enters or leaves the soft handover
area, the power offset for ACK/NACK and CQI may have a
change correspondingly.
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HSDPA Power Control Parameters
Parameter Name
ACK p owerof fset1
ACK p owerof fset2ACK p owerof fset3
Parameter ID
ACKPO1, ACKPO2, ACKPO3
Note:
ACKPO1is for such UEs whose Minimum inter-TTI interval equals one,
that is, such UEs can feedback one ACK or NACK each TTI.
ACKPO2 is for such UEs whose Minimum inter-TTI interval equals two,
that is, such UEs can feed back one ACK or NACK each at least two TTIs,
so in the two TTIs, UEs can repeat the same ACK or NACK.ACKPO3 is for such UEs whose Minimum inter-TTI interval equals three,
that is, such UEs can feed back one ACK or NACK each at least three
TTIs, so in the three TTI, UEs can repeat the same ACK or NACK.
GUI RangePO_5/15, PO_6/15, PO_8/15, PO_9/15, PO_12/15, PO_15/15, PO_19/15,
PO_24/15, PO_30/15,
Physical Range & Unit 5/15, 6/15, 8/15, 9/15, 12/15, 15/15, 19/15, 24/15, 30/15,
Default Value PO_24/15(24/15), PO_12/15(12/15), PO_9/15(9/15)Optional/Mandatory Mandatory
MML Command ADD CELLHSDPCCH
Description:
This parameter sets the power offset of ACK(DACK) comparing to uplink DPCCH power in non-soft handover status.
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HSDPA Power Control Parameters
Parameter Name
ACK powerof fset1 mult i -RLS
ACK powerof fset2 mult i -RLSACK powerof fset3 mult i -RLS
Parameter ID
ACKPO1FORSHO, ACKPO2FORSHO, ACKPO3FORSHO
Note:
ACKPO1FORSHO is for such UEs whose Minimum inter-TTI interval equals
one, that is, such UEs can feedback one ACK or NACK each TTI.
ACKPO2FORSHO is for such UEs whose Minimum inter-TTI interval equals
two, that is, such UEs can feedback one ACK or NACK each at least two
TTIs, so in the two TTIs, UEs can repeat the same ACK or NACK.ACKPO3FORSHO is for such UEs whose Minimum inter-TTI interval equals
three, that is, such UEs can feedback one ACK or NACK each at least three
TTIs, so in the three TTI, UEs can repeat the same ACK or NACK.
GUI RangePO_5/15, PO_6/15, PO_8/15, PO_9/15, PO_12/15, PO_15/15, PO_19/15,
PO_24/15, PO_30/15,
Physical Range & Unit 5/15, 6/15, 8/15, 9/15, 12/15, 15/15, 19/15, 24/15, 30/15,
Default Value PO_24/15(24/15), PO_24/15(24/15), PO_24/15(24/15)Optional/Mandatory Mandatory
MML Command ADD CELLHSDPCCH
Description:
This parameter sets the power offset of ACK (DACK) comparing to uplink DPCCH power in soft handover status.
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HSDPA Power Control Parameters
Parameter Name
NACK p owerof fset1
NACK p owerof fset2NACK p owerof fset3
Parameter ID
NACKPO1, NACKPO2, NACKPO3
Note:
NACKPO1is for such UEs whose Minimum inter-TTI interval equals one, that
is, such UEs can feedback one ACK or NACK each TTI.
NACKPO2 is for such UEs whose Minimum inter-TTI interval equals two, that
is, such UEs can feedback one ACK or NACK each at least two TTsI, so in
the two TTIs, UEs can repeat the same ACK or NACK.NACKPO3 is for such UEs whose Minimum inter-TTI interval equals three,
that is, such UEs can feedback one ACK or NACK each at least three TTIs,
so in the three TTI, UEs can repeat the same ACK or NACK.
GUI RangePO_5/15, PO_6/15, PO_8/15, PO_9/15, PO_12/15, PO_15/15, PO_19/15,
PO_24/15, PO_30/15,
Physical Range & Unit 5/15, 6/15, 8/15, 9/15, 12/15, 15/15, 19/15, 24/15, 30/15,
Default Value PO_24/15(24/15), PO_12/15(12/15), PO_9/15(9/15)Optional/Mandatory Mandatory
MML Command ADD CELLHSDPCCH
Description:
This parameter sets the power offset of NACK (DNACK) comparing to uplink DPCCH power in non-soft handover
status.
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HSDPA Power Control Parameters
Parameter Name
NACK pow eroffset1 mu lt i-RLS
NACK pow eroffset2 mu lt i-RLSNACK pow eroffset3 mu lt i-RLS
Parameter ID
NACKPO1FORSHO, NACKPO2FORSHO, NACKPO3FORSHO
Note:
NACKPO1FORSHO is for such UEs whose Minimum inter-TTI interval
equals one, that is, such UEs can feedback one ACK or NACK each TTI.
NACKPO2FORSHO is for such UEs whose Minimum inter-TTI interval
equals two, that is, such UEs can feedback one ACK or NACK each at least
two TTIs, so in the two TTIs, UEs can repeat the same ACK or NACK.NACKPO3FORSHO is for such UEs whose Minimum inter-TTI interval
equals three, that is, such UEs can feedback one ACK or NACK each at least
three TTIs, so in the three TTI, UEs can repeat the same ACK or NACK.
GUI RangePO_5/15, PO_6/15, PO_8/15, PO_9/15, PO_12/15, PO_15/15, PO_19/15,
PO_24/15, PO_30/15,
Physical Range & Unit 5/15, 6/15, 8/15, 9/15, 12/15, 15/15, 19/15, 24/15, 30/15,
Default Value PO_24/15(24/15), PO_24/15(24/15), PO_24/15(24/15)Optional/Mandatory Mandatory
MML Command ADD CELLHSDPCCH
Description:
This parameter sets the power offset of NACK (DNACK) comparing to uplink DPCCH power in soft handover status.
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HSDPA Power Control Parameters
Parameter Name CQI Power Offset
Parameter ID
CQIPO
Note:
CQIPO is for all UEs without regard to Minimum inter-TTI interval.
GUI RangePO_5/15, PO_6/15, PO_8/15, PO_9/15, PO_12/15, PO_15/15, PO_19/15,
PO_24/15, PO_30/15,
Physical Range & Unit 5/15, 6/15, 8/15, 9/15, 12/15, 15/15, 19/15, 24/15, 30/15,
Default Value PO_24/15(24/15)
Optional/Mandatory Mandatory
MML Command ADD CELLHSDPCCH
Description:
This parameter sets the power offset of CQI (DCQI) comparing to uplink DPCCH power in non-soft handover status.
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HSDPA Power Control Parameters
Parameter Name CQI Power Offset mult i-RLS
Parameter ID
CQIPOFORSHO
Note:
CQIPOFORSHO is for all UEs without regard to Minimum inter-TTI interval.
GUI RangePO_5/15, PO_6/15, PO_8/15, PO_9/15, PO_12/15, PO_15/15, PO_19/15,
PO_24/15, PO_30/15,
Physical Range & Unit 5/15, 6/15, 8/15, 9/15, 12/15, 15/15, 19/15, 24/15, 30/15,
Default Value PO_24/15(24/15)
Optional/Mandatory Mandatory
MML Command ADD CELLHSDPCCH
Description:
This parameter sets the power offset of CQI (DCQI) comparing to uplink DPCCH power in soft handover status.
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HSDPA Power Control
HS-SCCH Power Control
Fixed Power
Set fixed power for each HS-SCCH by O&M
Simple to configuration, but low utilization of the power
Based on CQI
If the HS-SCCH Power Control Method parameter is set to CQI,
the NodeB adjust the transmission power of HS-SCCH, depending
on the following information
CQI reported by UE
DTX detected by NodeB
Target frame error rate ( FER ) of HS-SCCH
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HSDPA Power Control Parameters
Parameter Name HS-SCCH Power Contro l Method
Parameter ID SCCHPWRCM
GUI Range FIXED, CQI
Physical Range & Unit None
Default Value CQI
Optional/Mandatory Mandatory
MML Command SET MACHSPARA
Description:This parameter sets the power control method for HS-SCCH.
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HSDPA Power Control Parameters
Parameter Name HS-SCCH Pow er
Parameter ID SCCHPWR
GUI Range 080
Physical Range & Unit -10 dB to 10 dB , Step: 0.25 dB
Default Value 28 ( -3 dB )
Optional/Mandatory Mandatory
MML Command SET MACHSPARA
Description:
When the HS-SCCH Power Contro l Methodis set to FIXED, the parameter sets
the fixed transmit power of HS-SCCH. The parameter value is relative to the P-CPICH power in dB
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HSDPA Power Control Parameters
Parameter Name HS-SCCH FER
Parameter ID SCCHFER
GUI Range 1999
Physical Range & Unit Permillage
Default Value 10 (1%)
Optional/Mandatory Mandatory
MML Command SET MACHSPARA
Description:
This parameter sets the target FER of the HS-SCCH. If the HS-SCCH FER is larger
than the HS-SCCH FER target, the HS-SCCH power will be increased. Otherwise, the
HS-SCCH power will be decreased.
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HSDPA Power Control
HS-PDSCH Power Control
Power is allocated in NodeB, Mac-hs allocates HS-PDSCH
power for different HSDPA users with scheduling algorithm
When configured by static HSDPA power allocation algorithm,
the total power of HS-PDSCH and HS-SCCH shall not exceed
the maximum transmission power
When configuredby dynamic HSDPA power allocation
algorithm, the maximum transmission power is the remaining
power excluding R99 power and power margin
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Contents
1. HSDPA Channel Type Mapping
2. HSDPA Code Resource Allocation
3. HSDPA Power Allocation
4. HSDPA Power Control
5. HSDPA Mob il i ty Management
6. HSDPA Scheduling Algorithm
7. HSDPA Flow Control
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HSDPA Mobility Management HSDPA connection
One HSDPA user has up to one HSDPA connection with network at the same
time
HSDPA connection HO means HO caused by moving
DPCH connection
DPCH connection has same function as R99 HO, Containing SHO, HHO and
inter-RAT HO
Both HSDPA connection and DPCH connection HO are based on UE
measurement report and other information, and they are controlled by
UTRAN side
The HSDPA mobility management includes all the mobility scenarios that
HSDPA serving cell is involved, including the following three types of
scenario:
HSDPA cell R99 cell
HSDPA cell HSDPA cell
HSDPA cell GSM/GPRS cell
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Handover between HSDPA and R99 cellsCell 2(R99)Cell 1(HSDPA) Cell 2(R99)Cell 1(HSDPA)
before handover after handover
Cell 2(R99)Cell 1(HSDPA) Cell 2(R99)Cell 1(HSDPA)
before handover after handover
Cell 2(R99)Cell 1(HSDPA) Cell 2(R99)Cell 1(HSDPA)
before handover after handover
Soft handover
The 1B (remove) is triggered
by HSDPA cell
Inter-frequency handover
2B is triggered by R99 cell
Soft handover
HSDPA cell is added into active set
The 1D event is triggered by HSDPA cell
Inter-frequency handover
The 2B event is triggered by
HSDPA cell
Cell 2(R99)Cell 1(HSDPA) Cell 2(R99)Cell 1(HSDPA)
before handover after handover
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HSDPA Handover Parameters
Parameter Name The timer length o f D2H Intra-hand overParameter ID D2HIntraHoTimerLen
GUI Range 0999
Physical Range & Unit 0999 (s)
Default Value 2
Optional/Mandatory Optional
MML Command SET HOCOMM
Description:
This parameter specifies the length of D2H penalty timer after the intra-
frequency handover. It is a non-periodic timer that defines the period for D2H
penalty after the soft handover and intra-frequency hard handover and helps toavoid ping-pang effect
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HSDPA Handover Parameters
Parameter Name The timer length of D2H Inter-hando ver
Parameter ID D2HInterHoTimerLen
GUI Range 0999
Physical Range & Unit 0999 (s)
Default Value 2Optional/Mandatory Optional
MML Command SET HOCOMM
Description:
This parameter specifies the length of D2H penalty timer after the inter-frequency
handover. It is the non-periodic timer that defines the period for D2H penalty afterthe inter-frequency hard handover and helps to avoid ping-pong effect
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HSDPA Handover Parameters
Parameter Name The timer length o f Mult i-Carr ier handov er
Parameter ID MultiCarrierHoTimerLen
GUI Range 0999
Physical Range & Unit 0999 (s)
Default Value 14
Optional/Mandatory Optional
MML Command SET HOCOMM
Description:
This parameter specifies the length of Multi-Carrier Anti-Ping Pong Timer afterhandover. It is the non-periodic timer that defines the period for D2H penalty for
source cell after handover and helps to avoid Ping-Pong effect.
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Handover between HSDPA and HSDPA
cells
before handover after handover
Cell 2(HSDPA)Cell 1(HSDPA) Cell 2(HSDPA)Cell 1(HSDPA)
before handover after handover
Cell 2(HSDPA)Cell 1(HSDPA) Cell 2(HSDPA)Cell 1(HSDPA)
The 1D event is triggered by
cell 2
Inter-frequency handover
2B is triggered by HSDPA cell
(cell2)
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HSDPA Handover Parameters
Parameter Name HSPA hysteresis t im er lengthParameter ID HSPATIMERLEN
GUI Range 01024
Physical Range & Unit 01024 (s)
Default Value 0
Optional/Mandatory Optional
MML Command SET HOCOMM
Description:
HSPA handover is triggered by event 1D. To avoid ping-pang HSPA serving cell
update, a protection timer is used.
After event 1D triggers HSPA handover, this timer is started. Then, event 1D will not
trigger HSPA handover any more before expiry of this timer.
Value 0 means this timer is not started; that is, HSPA handover is trigger
immediately. Value 1024 means HSPA handover will not be triggered before the cell
bearing the HSPA service is removed.
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Handover between HSDPA and GSM/GPRS cells
The handover between the HSDPA cell and
GSM/GPRS cell is the same as the handover between
the R99 cell and the GSM/GPRS cell
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HSDPA Direct Retry
The HSDPA direct retry is triggered by the following factors:
HSDPA Request is Initiated in the R99 Cell
Traffic Volume Increases
Timer (HRetryTimerLen)
Access to the Original HSDPA Cell is Rejected
are set on cell a
Cell b(f2, R99)
Cell a(f1,HSDPA)
UE initiates
HSDPA service
request from cell b
After DRD, UEHSDPA service
Cell b(f2, R99)
Cell a(f1,HSDPA)
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HSDPA Channel Switching Parameters
Parameter Name H Retry t im er length
Parameter ID HRetryTimerLen
GUI Range 0, 1180
Physical Range & Unit 0, 1180s
Default Value 5
Optional/Mandatory Optional
MML Command SET COIFTIMER
Description:
This parameter defines the timing length of the HSDPA directed retry timer, through
which the network periodically attempts to map the HSDPA-supported services on the
HS-DSCH. The timer works periodically without limit to retry times. The HSDPAdirected retry timer is in OFF state (or is turned off) when its timing length is set to
zero.
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HSDPA Channel Switching
With introducing HSDPA technology, the UE has one more RRCstate CELL_DCH (with HS-DSCH).
CELL_PCH CELL_FACH
CELL_DCH
CELL_DCH(with HS-DSCH)
UE State Transit ion Channel Switching
Cell-DCH ( with HS-DSCH ) Cell-DCH HS-DSCH DCH
Cell-DCH ( with HS-DSCH ) Cell-FACH HS-DSCH FACH
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HSDPA Channel Switching
Channel Switching between HS-DSCH and DCH
Channel Switch from HS-DSCH to DCH
Mobility based
Channel Switch from DCH to HS-DSCH
Mobility Management
Traffic Volume
Timer (HRetryTimerLen)
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HSDPA Channel Switching
Channel Switching between HS-DSCH and FACH
Since the HSDPA UE occupies the DPCH, the RAN will switch
the transport channel from HS-DSCH to FACH to reduce
occupation of the DPCH when the following conditions are met.
The HS-DSCH carries the BE service or the PS streaming service
for the UE.
There is no data flow of any of the services for a certain length of
time.
By contrary, if data service activity increased, for example,
when the RNC receives a 4a event measuring report ,state
transfer is triggered for cell-FACH to Cell-DCH ( with HS-
DSCH )
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HSDPA Channel Switching
Parameter Name BE HS-DSCH to FACH transi t io n timer [s ]
Parameter ID BeH2FTvmThd
GUI Range 165535
Physical Range & Unit 165535 s
Default Value 180
Optional/Mandatory Optional
MML Command SET UESTATETRANS
Description:
This parameter is used to detect the stability of a UE in low activity state in
CELL_DCH (with HS-DSCH) state
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HSDPA Channel Switching
Parameter Name
Realtime Traff DCH or HS-DSCH to FACH
transi t ion t imer[s]
Parameter ID RtDH2FStateTransTimer
GUI Range 165535
Physical Range & Unit 165535s
Default Value 180
Optional/Mandatory Optional
MML Command SET UESTATETRANS
Description:
timer is used in detecting whether a real-time service UE in CELL_DCH state is instable low activity state
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Contents
1. HSDPA Channel Type Mapping
2. HSDPA Code Resource Allocation
3. HSDPA Power Allocation
4. HSDPA Power Control
5. HSDPA Mobility Management
6. HSDPA Schedul ing Algor i thm
7. HSDPA Flow Control
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HSDPA Scheduling Algorithm
Huawei supports four MAC-hs scheduling algorithms: Max C/I,RR (Round Robin), PF (Proportional Fair), and EPF (Enhanced
Proportional Fair)
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HSDPA Scheduling Algorithm
PF (Proportional Fair )
For the user selection in PF scheduling algorithm, CQI, the filtered
scheduling rate of UE are taken into account. The scheduling priority
is calculated with the following formula :
is the instant rate of UE i which can be reached according
to the CQI_i at the scheduling time t. Is equal to TBS_i /TTI
is the user's scheduling rate during previous period
)(
)(Pr
max_
tr
tRiority
i
i
i
)(max_ tRi
)(max_ tR
i
)(tri
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HSDPA Scheduling Algorithm
EPF ( Enhanced Proportional Fair )
Based on the PF algorithm, the EPF algorithm can ensure the
users Guaranteed Bit Rate (GBR) requirement when the cell is
not in congestion, which is useful to guarantee the users QoS
and fairness.
500ms
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HSDPA Scheduling Algorithm
EPF ( Enhanced Proportional Fair ) In the X time segment, only the users configured with GBR are
scheduled according to the PF algorithm.
In the Y time segment, only the users configured with GBR but
not achieved are scheduled according to their Scheduling
Priority Indicator (SPI). Only when the data rate of users with
higher SPI reaches their GBR, the users with lower SPI can be
scheduled. Those users with the same SPI will be scheduled
according to those CQI, the higher the CQI is, the higher the
priority is.
In the Z time segment, all users are scheduled according to the
PF algorithm.
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HSDPA Scheduling Algorithm parameters
Parameter Name Schedul ing Method
Parameter ID SM
GUI RangeEPF (Enhanced PF), PF (PF), RR (Round
Robin), MAXCI (Max C/I )
Physical Range & Unit Method
Default Value EPF
Optional/Mandatory Mandatory
MML Command SET MACHSPARA
Description:
This parameter specifies the algorithm switch used to select the scheduling
algorithm
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Contents
1. HSDPA Channel Type Mapping
2. HSDPA Code Resource Allocation
3. HSDPA Power Allocation
4. HSDPA Power Control
5. HSDPA Mobility Management
6. HSDPA Scheduling
7. HSDPA Flow Contro l
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HSDPA Flow Control
Why ?
Balance the data flow between Iub and Uu
Achieve high bandwidth utilization efficiency, maximize the cell throughput
Decrease data transmission delay, avoid data discard and retransmission due to
congestion
Functions
Response to a HS-DSCH Capacity Request, to indicate the number of MAC-d PDUs that
the RNC is allowed to transmit for each UE in the specified interval
Modify the capacity and control the user data flow according to the MAC-hs queue buffer
size
Node BUu RNCIub
CN
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HSDPA Flow Control Signaling
The Iub HSDPA flow control process is implementedthrough the capacity request and allocation processes
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HSDPA Flow Control Signaling
The NodeB sends the HS-DSCH Capacity Allocationmessage to the CRNC in response to a HS-DSCH Capacity
Request
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