Post on 10-Nov-2014
transcript
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