ericsson parameters

Ericsson Parameters

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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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Cell Reselection procedure

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Cell Reselection procedure

• 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 and

WCDMA 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 a Redirect 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