92810700 ericsson parameters

7/29/2019 92810700 Ericsson Parameters

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Ericsson Parameters


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All Rights Reserved Alcatel-Lucent 2008

Agenda

Introduction.

Important RAN Functionality.

Parameter description.


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Idle Mode- Cell Selection.

qQualmin: Minimum required (acceptable) quality level in the cell (dB). Used to set cell border between two

cells. Used in UE functions for cell selection/reselection in idle mode and connected mode. SIB 3 for serving

cell and SIB 11 for adjacent cells.

QRXlevel Min- Minimum required (acceptable) RX level in the cell. (dBm). Used in UE functions for cell

selection/reselection in idle mode and connected mode. SIB 3 serving cell, SIB 11 adjacent cells.

maxTxPowerUl-The maximum UE transmission power on the RACH when accessing the system. Used in UE

functions for cell selection/reselection in idle mode. SIB 3.

P- UE maximum output power according to its class.


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Cell Reselection procedure

Valid for UEs both in Idle and Connected mode.

Triggered when the cell is no longer suitable.

When UE that has camped normally finds a better cell.

Performs ranking of cells that fulfills the cell selection and R criteria.


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Qmeas is the quality value of the received signal.

Qhyst1(s)- hysteresis value read in system information of the serving cell. Used for GSM cells and WCDMA

cells when qualMeasQuantity set to CPICH RSCP.

Qhyst2(s)- hysteresis value when qualMeasQuantity set to CPICH Ec/No.

Qoffset1( s,n)- offset between two cells read in system information of the serving cell. Used for GSM andWCDMA cells when qualMeasquantity is set to CPICH RSCP.

Qoffset2( s,n)- offset between two cells read in system information of the serving cell. Used for GSM and

WCDMA cells when qualMeasquantity is set to CPICH Ec/no.


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Radio Connection Supervision


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Radio Connection Supervision


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Power Control


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Power Control


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Common channel power


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WCDMA power control

Relevant parameter:

Constantvaluecprach


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Power control contd.


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Admission Control


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Admission control: code congestion, hardware limits


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Mobility


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Mobility: Why SHO?


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SHO: Overview of signaling flow


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SHO events diagram


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SHO events diagram contd.


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Inter freq HO


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Inter freq HO contd


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IRAT HO

After both these, an

event 3a occurs


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GSM to UMTS


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Service based Hand over

Service based handover- direct speech users to GSM based on a service indicator ( SI) .

SI= should and RAB combination= speech to GSM.

servicebasedHosupport= True.

Check if GSM handover is allowed for this RAB, C_gsmhoallowed and FDDGSMhosupport


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Service based Hand over contd.


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Load Sharing

Enhances the performance of a Radio access network by pooling together resources.

Two load sharing features available: Inter frequency load sharing and Directed retry to GSM.


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Inter frequency load sharing

Diverts incoming traffic both CS and PS during RRC connection establishment from a more

loaded cell to a less loaded one at the same location but on another frequency.

RRC connection reject message is sent . The message carries aRedirect info .


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Directed Retry to GSM

Voice traffic diverted to GSM/ Blind handover.

Best to chose the collocated GSM cell due to coverage match


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Key HSDPA parameters


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Key HSDPA parameters

numHsPdschCodes- number of Pdsch codes that are fixed allocated in a cell. These

codes cannot be used for DCH traffic even if there is no HSDPA traffic in a cell.

numHsPdschcodes,maxHSpdschcodes,numHsscchcodes,maxnumhsdpaUsers

Dynamic code allocation:


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Q&A

92810700 ericsson parameters

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