ericsson parameters

Ericsson Parameters

All Rights Reserved © Alcatel-Lucent 2008

Agenda

Introduction.

Important RAN Functionality.

Parameter description.


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.


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.



• 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.


Radio Connection Supervision


Power Control


Common channel power


WCDMA power control

Relevant parameter: Constantvaluecprach


Power control contd.


Admission Control


Admission control: code congestion, hardware limits


Mobility


Mobility: Why SHO?


SHO: Overview of signaling flow


SHO events diagram


SHO events diagram contd.


Inter freq HO


Inter freq HO contd


IRAT HO

After both these, an event 3a occurs


GSM to UMTS


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


Service based Hand over contd.


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.


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 .


Directed Retry to GSM

Voice traffic diverted to GSM/ Blind handover.

Best to chose the collocated GSM cell due to coverage match


Key HSDPA parameters


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:


Q&A

ericsson parameters

Documents

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radio connection

power control

admission

wcdma cells

minimum required

ue functions

cpich ec