37222090-Huawei-WCDMA-HSDPA-Parameters huawei)

HSDPA RRM and Parameters ISSUE 1.0 www.huawei.com

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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 onto HS-DSCH The bit rate thresholds are used
RAB with maximum bit rate higher than or equal to the threshold will be 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 for operator to disable the mapping of streaming service onto HS-DSCH RB on FACH

Interactive Background

mapping

Streaming

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RB on DCH RB on HS-DSCH

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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 when the downlink max bit rate is more than or equal to DL streaming threshold 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 HSDSCH. 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 traffic threshold on HSDPA

Parameter ID

DlBeTraffThsOnHsdpa

GUI Range

D8, D16, D32, D64, D128, D144, D256, D384, D768, D1024, D1536, D2048

Physical Range & Unit

8, 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 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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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 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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1.

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The channelization codes are constant resources consisting of the following three parts:

2.

1.

channelization codes for HS-PDSCH

2.

channelization codes for Common channels and HS-SCCH

3.

channelization codes for DPCH

The resources are reserved for the common channels and the HS-SCCH. The parameter of the codes reserved for the HS-SCCH can be configured on the RNC LMT.

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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 HSPDSCH codes according to the real-time usage status of the codes



Configure the maximum and minimum numbers of codes available for HSPDSCH 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 or radio link deletion, the RNC will extend the codes reserved for the HSPDSCH 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 Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

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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

1–15

Physical Range & Unit

1–15 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

Allocate Code Mode

Parameter ID

ALLOCCODEMODE

GUI Range

Manual, Automatic.

Physical Range & Unit

Static 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 Number for HS-PDSCH

Parameter ID

HSPDSCHCODENUM

GUI Range

1–15

Physical Range & Unit

1–15 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 Allocate Code Mode is set to Manual

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Code Allocation Parameters Parameter Name

Code Max Number for HS-PDSCH

Parameter ID

HSPDSCHMAXCODENUM

GUI Range

1–15

Physical Range & Unit

1–15

Default Value

10

Optional/Mandatory

Mandatory

MML Command

ADD CELLHSDPA

Unit: code

Description: This parameter sets the maximum number of HS-PDSCH codes available in a cell This parameter is valid only when Allocate Code Mode is set to Automatic

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Code Allocation Parameters Parameter Name

Code Min Number for HS-PDSCH

Parameter ID

HSPDSCHMAXCODENUM

GUI Range

1–15

Physical Range & Unit

1–15 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 Allocate Code Mode is set to Automatic

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Code Allocation Parameters Parameter Name

Cell SF reserved threshold

Parameter ID

CellSfResThd

GUI Range

SF8, SF16, SF32, SF64, SF128, SF256

Physical Range & Unit

8, 16, 32, 64, 128, 256

Default Value

16

Optional/Mandatory

Mandatory

MML Command

ADD CELLLDR

Description: When Allocate Code Mode is set to Automatic, this parameter can be used to decide whether to increase or decrease the HS-PDSCH code number between the minimum number and maximum number. 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 this parameter, which aims to increase HS-PDSCH code number. If not, try to decrease HS-PDSCH code number

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HSDPA Code Resource Allocation 

NodeB-controlled dynamic allocation 

NodeB-controlled dynamic allocation allows the NodeB to use the HSPDSCH 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 RNCallocated 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 codes allocation 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 Allocation 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 Total Power

Power margin for DCH power control

Higher power utility efficiency

Allowed power for HSDPA

DPCH Power for CCH Time Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

1.

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The cell total transmit power is the constant resources. The DL power consists of the following three parts: 1.

Power of the HSPA DL physical channel (HS-PDSCH, HS-SCCH, E-AGCH, ERGCH and E-HICH)

2.

Common channel power

3.

DPCH power

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HSDPA Power Allocation Parameters Parameter Name

HS-PDSCH, HS-SCCH, E-AGCH, E-RGCH and EHICH Total Power

Parameter ID

HSPAPOWER

GUI Range

0–500

Physical Range & Unit

0 dBm–50 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, EAGCH, E-RGCH and E-HICH.

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HSDPA Power Allocation Parameters Parameter Name

Power Margin

Parameter ID

PWRMGN

GUI Range

0–100

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

1–100

Physical Range & Unit

1%~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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1.

Page25

The cell total HSDPA power is limited by the parameters “power margin” and “HSDPA power”.

2.

But in the initial deployment if only a few HSDPA users is active in one cell, high cell load (interference) is not expected in some scenarios. “HSDPA power limitation per user” can limit the HSDPA cell load when only a few HSDPA user (e.g 1~2) is active. When HSDPA active user number increases, “HSDPA power” is the limitation.

3.

“HSDPA power limitation per user” is to limit the max HSDPA power per user per TTI, the HSDPA power include HS-DSCH power and HS-SCCH power, and it will decrease the HSDPA user throughput and cell throughput if the parameter is not configured properly

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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 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.

Power

∆ ACK /∆ NACK

ACK / NACK

∆ CQI CQI Time

Power

Uplink DPCCH Time

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Page27

The transmitting power of HS-DPCCH is:

Where, ΔHS-DPCCH , as for the first slot of one TTI, means ΔACK when UE replies ACK, Δ NACK when UE replies NACK., as for the second and third slots of one TTI, means ΔCQI. Pul-DPCCH is the transmitting power of associated UL DPCCH.

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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 HSDPCCH 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 poweroffset1 ACK poweroffset2 ACK poweroffset3

Parameter ID

ACKPO1, ACKPO2, ACKPO3 Note: ACKPO1 is 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 Range

PO_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 poweroffset1 multi-RLS ACK poweroffset2 multi-RLS ACK poweroffset3 multi-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 Range

PO_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 poweroffset1 NACK poweroffset2 NACK poweroffset3

Parameter ID

NACKPO1, NACKPO2, NACKPO3 Note: NACKPO1 is 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 Range

PO_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

ADD CELLHSDPCCH MML Command 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 poweroffset1 multi-RLS NACK poweroffset2 multi-RLS NACK poweroffset3 multi-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 Range

PO_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 Range

PO_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 multi-RLS

Parameter ID

CQIPOFORSHO Note: CQIPOFORSHO is for all UEs without regard to Minimum inter-TTI interval.

GUI Range

PO_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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1.

Page35

The process of power control adjustment in an adjustment period as follows: 1.

Get PHS-SCCH,Init and PHS-SCCH,max parameter according to reported CQI;

2.

Adjust HS-SCCH power according to the change of CQI;

3.

Adjust HS-SCCH power according to HS-DPCCH ACK/NACK/DTX information, the formula is:  N DTX  C pc   ∆ HS - SCCH(n) ＝ ∆ HS - SCCH(n - 1) + Min  ( − 1) × S base , S max, u  FER T    

2.

The HS-SCCH power for the Nth schedule time is:

3.

The HS-SCCH power for the Nth schedule time will be limited by PHS-SCCH,min and PHS-SCCH,max. that is, the real HS-SCCH power should belong to the range [PHS-SCCH,min, PHS-SCCH,max].

4.

The HS-SCCH FER parameter can be set on the NodeB LMT. Please next page.

 N DTX C pc  − 1) × S base , S max, u PHS − SCCh ( n ) ＝ P HS − SCCh ( n − 1) + ( CQI ( n − 1) − CQI ( n )) + Min  ( FER T  

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    

HSDPA Power Control Parameters Parameter Name

HS-SCCH Power Control 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 Power

Parameter ID

SCCHPWR

GUI Range

0–80

Physical Range & Unit

-10 dB to 10 dB

Default Value

28 ( -3 dB )

Optional/Mandatory

Mandatory

MML Command

SET MACHSPARA

, Step: 0.25 dB

Description: When the HS-SCCH Power Control Method is set to FIXED, the parameter sets the fixed transmit power of HS-SCCH. The parameter value is relative to the PCPICH power in dB

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HSDPA Power Control Parameters Parameter Name

HS-SCCH FER

Parameter ID

SCCHFER

GUI Range

1–999

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 Mobility 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 interRAT 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 cells Cell 1(HSDPA)

Cell 2(R99)

Cell 1(HSDPA)

Cell 2(R99)

Cell 1(HSDPA)

Cell 2(R99)

before handover before handover

after handover

Inter-frequency handover 2B is triggered by R99 cell

Cell 1(HSDPA) Cell 2(R99)

Cell 1(HSDPA)

Cell 2(R99)

Cell 1(HSDPA)

Cell 2(R99)

before handover before handover

Cell 2(R99)

after handover

Soft handover The 1B (remove) is triggered by HSDPA cell

Cell 1(HSDPA)

Cell 1(HSDPA)

after handover

after handover

Soft handover HSDPA cell is added into active set The 1D event is triggered by HSDPA cell

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Inter-frequency handover The 2B event is triggered by HSDPA cell

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Cell 2(R99)

HSDPA Handover Parameters Parameter Name

The timer length of D2H Intra-handover

Parameter ID

D2HIntraHoTimerLen

GUI Range

0–999

Physical Range & Unit

0–999 (s)

Default Value

2

Optional/Mandatory

Optional

MML Command

SET HOCOMM

Description: This parameter specifies the length of D2H penalty timer after the intrafrequency 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 to avoid ping-pang effect

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HSDPA Handover Parameters Parameter Name

The timer length of D2H Inter-handover

Parameter ID

D2HInterHoTimerLen

GUI Range

0–999

Physical Range & Unit

0–999 (s)

Default Value

2

Optional/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 after the inter-frequency hard handover and helps to avoid ping-pong effect

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HSDPA Handover Parameters Parameter Name

The timer length of Multi-Carrier handover

Parameter ID

MultiCarrierHoTimerLen

GUI Range

0–999

Physical Range & Unit

0–999 (s)

Default Value

14

Optional/Mandatory

Optional

MML Command

SET HOCOMM

Description: This parameter specifies the length of Multi-Carrier Anti-Ping Pong Timer after handover. 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 Cell 1(HSDPA)

Cell 2(HSDPA)

Cell 1(HSDPA)

before handover

Cell 2(HSDPA)

after handover

The 1D event is triggered by cell 2

Cell 1(HSDPA)

Cell 2(HSDPA)

before handover

Cell 1(HSDPA)

Cell 2(HSDPA)

after handover

Inter-frequency handover 2B is triggered by HSDPA cell (cell2)

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HSDPA Handover Parameters Parameter Name

HSPA hysteresis timer length

Parameter ID

HSPATIMERLEN

GUI Range

0–1024

Physical Range & Unit

0–1024 (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 Cell a(f1,HSDPA)

Cell a(f1,HSDPA)

Cell b(f2, R99)

Cell b(f2, R99)

UE initiates HSDPA service request from cell b After DRD, UE HSDPA service are set on cell a

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1.

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HSDPA Request is Initiated in the R99 Cell 1.

When the R99 cell and the HSDPA cell cover the same physical area and the UE initiates a data service access request from the R99 cell, the system will assign it to the HS-PDSCH of the HSDPA cell by direct retry.

2.

Traffic Volume Increases 1.

The HSDPA direct retry triggered by the increase of the traffic volume is of two types: 1.

2.

2.

Suppose the R99 cell and the HSDPA cell cover the same physical area. When the traffic volume of the UE that is in the R99 cell and is in the FACH state increases, the system reassigns the service to the HSPDSCH of the HSDPA cell. Suppose the R99 cell and the HSDPA cell cover the same physical area. For the service that shall be set up on the HSDPA channel according to the service mapping rules but is set up on the DCH of the R99 cell, the system reassigns it to the HS-DSCH of the HSDPA cell when the traffic volume increases.

When the service is reconfigured from DCH to HS-DSCH, the UL rate is unchanged.

3.

Timer 1.

Suppose the R99 cell and the HSDPA cell cover the same physical area. For the service that shall be set up on the HSDPA channel according to the service mapping rules but is set up on the DCH of the R99 cell, the system reassigns it to the HS-DSCH of the HSDPA cell when the timer for the unconformity between the channel that the service is suitable for and the channel that bears Confidential Information of Huawei. No Spreading Without Permission the service expires.

2.

The UL rate is the same as in DCH when the service is reconfigured to HS-

1.

Access to the Original HSDPA Cell is Rejected 1.

The rejection of the access to the original HSDPA cell is of the following types: 1.

2.

3.

4.

The access to the HSDPA cell is rejected when the service is set up. Suppose two HSDPA cells cover the same physical area. If the UE initiates a data service request from one of the HSDPA cell but fails to be accessed to the cell, the system reassigns the service to the HS-DSCH of the other HSDPA that covers the same physical area through direct retry. The access to the HSDPA cell is rejected when the channel transition from the FACH to the HS-DSCH is triggered by the increase of the traffic volume. Suppose two HSDPA cells cover the same physical area. The traffic volume of the UE that is in the R5 cell and is in FACH state increases, the system attempts to reassign the service to the HS-DSCH of the HSDPA cell. If the access to the HSDPA cell fails, the system reassigns the service to the HS-PDSCH of the other HSDPA cell that covers the same physical area. The access to the HSDPA cell is rejected when the channel transition from the DCH to the HS-DSCH is triggered by the increase of the traffic volume. Suppose two HSDPA cells cover the same physical area. For the service that shall be set up on the HSDPA channel according to the service mapping rules but is set up on the DCH of one HSDPA cell, the system attempts to reassign it to the HS-DSCH of the HSDPA cell when the traffic volume increases. If the access to the HSDPA cell fails, the system reassigns the service to the HS-DSCH of the other HSDPA cell that covers the same physical area. The access to the HSDPA cell is rejected when the channel transition from the DCH to the HS-DSCH is triggered by the timer.Suppose two HSDPA cell cover the same physical area. For the service that shall be set up on the HSDPA channel according to the service mapping rules but is set up on the DCH of a HSDPA cell, the system attempts to reassign it to the HS-DSCH of the HSDPA cell when the timer for the unconformity between the channel that the service is suitable for and the channel that bears the service expires. If the access to the HSDPA cell fails, the system reassigns the service to the HS-DSCH of the other HSDPA cell that covers the same physical area.

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HSDPA Channel Switching Parameters Parameter Name

H Retry timer length

Parameter ID

HRetryTimerLen

GUI Range

0, 1～180

Physical Range & Unit

0, 1～180s

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 HSDPA directed 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 RRC

state CELL_DCH (with HS-DSCH). CELL_DCH

CELL_PCH

CELL_FACH

CELL_DCH (with HS-DSCH)

UE State Transition

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 HSDSCH )

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HSDPA Channel Switching Parameter Name

BE HS-DSCH to FACH transition timer [s]

Parameter ID

BeH2FTvmThd

GUI Range

1～65535

Physical Range & Unit

1～65535 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 transition timer[s]

Parameter ID

RtDH2FStateTransTimer

GUI Range

1～65535

Physical Range & Unit

1～65535s

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 in stable 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 Scheduling Algorithm 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 :

Pr iority i =

Ri _ max (t ) ri (t )

Ri _ max (t ) is the instant rate of UE i which can be reached according to the CQI_i at the scheduling timeRt.i _ max (t ) Is equal to TBS_i /



TTIr

i



(t ) is the user's scheduling rate during previous period

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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

Scheduling Method

Parameter ID

SM

GUI Range

EPF (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 Control

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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 Uu

Node B

Iub

RNC

CN

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HSDPA Flow Control Signaling 

The Iub HSDPA flow control process is implemented through the capacity request and allocation processes

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HSDPA Flow Control Signaling 

The NodeB sends the HS-DSCH Capacity Allocation message to the CRNC in response to a HS-DSCH Capacity Request

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1.

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CmCH-PI: configured via the Scheduling Priority Indicator in NBAP. It is the relative priority of the data frame and the SDUs included.

2.

HS-DSCH Interval: indicates the time interval during which the HS-DSCH Credits granted in the HS-DSCH CAPACITY ALLOCATION Control Frame may be used.

3.

HS-DSCH credits: indicates the number of MAC-d PDUs that a CRNC may transmit during one HS-DSCH Interval granted in the HS-DSCH CAPACITY ALLOCATION Control Frame.

4.

Maximum MAC-d PDU length: indicates the maximum allowable PDU size among the MAC-d PDU sizes configured via NBAP.

5.

HS-DSCH repetition period: indicates the number of subsequent intervals that the HSDSCH Credits IE granted in the HS-DSCH CAPACITY ALLOCATION Control Frame may be used and 0 = unlimited repetition period.

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Thank you www.huawei.com

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