wcdma hsdpa rrm.ppt

5/21/2018 WCDMA HSDPA RRM.ppt

1/66

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Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.

HSDPA RRM and

Parameters

ISSUE 1.0


2/66Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved. Page1

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



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



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.




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


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.




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


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.



Contents


2. HSDPA Code Resou rce Alloc at ion








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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Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved. Page8


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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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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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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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


MML Command ADD CELLHSDPA

Description:

This parameter sets the number of HS-SCCH codes available in a cell.


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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



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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Parameter Name Code Num ber for HS-PDSCH

Parameter ID HSPDSCHCODENUM

GUI Range 115


Default Value 5



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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Parameter Name Code Max Number for HS-PDSCH

Parameter ID HSPDSCHMAXCODENUM

GUI Range 115


Default Value 10



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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Parameter Name Code Min Num ber for HS-PDSCH

Parameter ID HSPDSCHMAXCODENUM

GUI Range 115

Physical Range & Unit115

Unit: code

Default Value 5



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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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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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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Parameter Name Dynamic cod es al locat ion switch

Parameter ID DYNCODESW

GUI Range OPEN, CLOSE

Physical Range & Unit OPEN, CLOSE

Default Value OPEN


MML Command SET MACHSPARA


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Contents



3. HSDPA Power A l location






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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)



Description:This parameter sets the maximum available power for HS-PDSCH, HS-SCCH, E-

AGCH, E-RGCH and E-HICH.


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Parameter Name Power Margin

Parameter ID PWRMGN

GUI Range 0100

Physical Range & Unit Percent %

Default Value 10



Description:

Power margin for R99 power control in one TTI


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Parameter Name Max Power per H user

Parameter ID MXPWRPHUSR

GUI Range 1100

Physical Range & Unit1%~100%

Unit:1%

Default Value 100



Description:The power of each HSDPA user in one TTI will be limited by this parameter value


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Contents




4. HSDPA Power Contro l





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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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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.


PO_24/15, PO_30/15,




Description:

This parameter sets the power offset of ACK (DACK) comparing to uplink DPCCH power in soft handover status.


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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.


PO_24/15, PO_30/15,




Description:

This parameter sets the power offset of NACK (DNACK) comparing to uplink DPCCH power in non-soft handover

status.


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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.


PO_24/15, PO_30/15,




Description:

This parameter sets the power offset of NACK (DNACK) comparing to uplink DPCCH power in soft handover status.


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Parameter Name CQI Power Offset

Parameter ID

CQIPO

Note:

CQIPO is for all UEs without regard to Minimum inter-TTI interval.


PO_24/15, PO_30/15,


Default Value PO_24/15(24/15)



Description:

This parameter sets the power offset of CQI (DCQI) comparing to uplink DPCCH power in non-soft handover status.


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Parameter Name CQI Power Offset mult i-RLS

Parameter ID

CQIPOFORSHO

Note:

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


PO_24/15, PO_30/15,


Default Value PO_24/15(24/15)



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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Parameter Name HS-SCCH Power Contro l Method

Parameter ID SCCHPWRCM

GUI Range FIXED, CQI

Physical Range & Unit None

Default Value CQI



Description:This parameter sets the power control method for HS-SCCH.


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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 )



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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Parameter Name HS-SCCH FER

Parameter ID SCCHFER

GUI Range 1999

Physical Range & Unit Permillage

Default Value 10 (1%)



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





5. HSDPA Mob il i ty Management




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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)




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


The 2B event is triggered by

HSDPA cell




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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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Parameter Name The timer length of D2H Inter-hando ver

Parameter ID D2HInterHoTimerLen

GUI Range 0999


Default Value 2Optional/Mandatory Optional


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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Parameter Name The timer length o f Mult i-Carr ier handov er

Parameter ID MultiCarrierHoTimerLen

GUI Range 0999


Default Value 14



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


Cell 2(HSDPA)Cell 1(HSDPA) Cell 2(HSDPA)Cell 1(HSDPA)


Cell 2(HSDPA)Cell 1(HSDPA) Cell 2(HSDPA)Cell 1(HSDPA)

The 1D event is triggered by

cell 2


2B is triggered by HSDPA cell

(cell2)


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Parameter Name HSPA hysteresis t im er lengthParameter ID HSPATIMERLEN

GUI Range 01024


Default Value 0



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


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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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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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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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


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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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


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






6. HSDPA Schedul ing Algor i thm



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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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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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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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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



Description:

This parameter specifies the algorithm switch used to select the scheduling

algorithm


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Contents






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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