9 UMTS Overload Control-41.pdf
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UMTS Overload Control ZTE University
description
UMTS Overload Control-
Transcript of 9 UMTS Overload Control-41.pdf
UMTS Overload Control
ZTE University
Content
Function Introduction Function Introduction R99 Overload Control
HSDPA O l d C t l HSDPA Overload Control HSUPA Overload Control Overload Control Parameters
Function Introduction Why to Perform Overload Control
Improve the call successful ratio Improve the call successful ratio Enable appropriate utilization of system resources
When to Perform Overload control UL/DL load reaches or exceeds threshold
How to determine overloadUL RTWP UL: RTWP
DL: TCP
Overload threshold
Related Parameters
Basic Priority ARP (Allocation/Retention Priority) and Traffic class
Scheduling Priority of RNC BP and radio bearer type
Application Priority BP R di b t ( ith l f DCH HSPA d MBMS) BP, Radio bearer type (with values of DCH, HSPA, and MBMS), and rate of existing subscribers
Related Parameters
Content
Function Introduction Function Introduction R99 Overload Control
HSDPA O l d C t l HSDPA Overload Control HSUPA Overload Control Overload Control Parameters
R99 Overload Control States
R99 Overload Control
Normal overload control downgrade data rate forced release soft handover link
f d h d t th ll forced handover to another cell channel switch （I/B） call drop call drop
Serious overload control call dropp
R99 Overload Control Process
Content
Function Introduction Function Introduction R99 Overload Control
HSDPA O l d C t l HSDPA Overload Control HSUPA Overload Control Overload Control Parameters
HSDPA Overload Control States
HSDPA Overload Control
Normal overload control downgrade data rate forced release soft handover link
f d h d t th ll forced handover to another cell channel switch （I/B） call drop call drop
Serious overload control call dropp
HSDPA Overload Control Process
Content
Function Introduction Function Introduction R99 Overload Control
HSDPA O l d C t l HSDPA Overload Control HSUPA Overload Control Overload Control Parameters
HSUPA Overload Control States
HSUPA Overload Control
Normal overload control downgrade data rate forced handover to another cell
ll d call drop
Serious overload control call drop call drop
Content
Function Introduction Function Introduction R99 Overload Control
HSDPA O l d C t l HSDPA Overload Control HSUPA Overload Control Overload Control Parameters
UlDecRateSw
Parameter name Uplink Switch for Shielding Rate ReductionAbbreviated name UlDecRateSwAbbreviated name UlDecRateSw
DescriptionThis parameter is a switch indicating whether it is open or closed for decreasing rate when the cell is in the
li k l d t tuplink overload state.
Range and Step 0: Closed1: OpenOpe
Default Value 1: Open
UlForceHandoffSw
Parameter name Uplink Switch for Shielding Forced HandoverAbbreviated name UlForceHandoffSwAbbreviated name UlForceHandoffSw
DescriptionThis parameter is a switch indicating whether it is open or closed for forcing handover when the cell is in the
li k l d t tuplink overload state.
Range and Step 0: Closed1: OpenOpe
Default Value 0: Closed
UlDropSw
Parameter name Uplink Switch for Shielding Forced DropAbbreviated name UlDropSwAbbreviated name UlDropSw
DescriptionThis parameter is a switch indicating whether it is open or closed for dropping call when the cell is in the uplink
l d t toverload state.
Range and Step 0: Closed1: OpenOpe
Default Value 1: Open
DlDecRateSw
Parameter name Downlink Switch for Shielding Rate ReductionAbbreviated name DlDecRateSwAbbreviated name DlDecRateSw
DescriptionThis parameter is a switch which indicates whether it is open or closed for decreasing data rate when the cell is i th d li k l d t tin the downlink overload state.
Range and Step 0: Closed1: OpenOpe
Default Value 1: Open
DlForceHandoffSw
Parameter name Downlink Switch for Shielding Forced HandoverAbbreviated name DlForceHandoffSwAbbreviated name DlForceHandoffSw
DescriptionThis parameter is a switch which indicates whether is open or closed for forcing handover when the cell is in th d li k l d t tthe downlink overload state.
Range and Step 0: Closed1: OpenOpe
Default Value 0: Closed
DlDropSw
Parameter name Downlink Switch for Shielding Forced DropAbbreviated name DlDropSwAbbreviated name DlDropSw
DescriptionThis parameter is a switch which indicates whether is open or closed for forcing handover when the cell is in th d li k l d t tthe downlink overload state.
Range and Step 0: Closed1: OpenOpe
Default Value 0: Closed
MaxNumUeOfDecRat
Parameter name Maximum Number of UE Decreasing Rate When Congestiong
Abbreviated name MaxNumUeOfDecRat
D i tiThis parameter indicates the maximum number of
i h t ill b d d h ti hDescription services whose rates will be decreased each time when congestion takes place.
Range and Step [1, 100]a ge a d Step [ , 00]Default Value 3
DlMaxForHoNum
Parameter name Maximum Number of Downlink Forced Handover Users or Deleted Radio Links Every Timey
Abbreviated name DlMaxForHoNum
D i tiThis parameter indicates the maximum number of
i h t ill b d d h ti hDescription services whose rates will be decreased each time when congestion takes place.
Range and Step [1, 50]a ge a d Step [ , 50]Default Value 3
DlMaxDrpUrNum
Parameter name Maximum Number of Downlink Forced Drop Users Every Timey
Abbreviated name DlMaxDrpUrNum
D i tiThis parameter indicates the maximum number of
l t d UE hi h f d t b d d h tiDescription selected UEs which are forced to be dropped each time when downlink overload happens.
Range and Step [1, 50]a ge a d Step [ , 50]Default Value 1
UlDnMaxStg
Parameter name Maximum Number of Degraded Uplink Load Steps Every Timey
Abbreviated name UlDnMaxStg
D i tiThis parameter indicates the maximum number of DRBC t f d i d t t f th l t d iDescription steps of decreasing data rate for the selected service
each time when uplink overload happens.
Range and Step [1, 8]a ge a d Step [ , 8]Default Value 1
UlMaxForHoNum
Parameter name Maximum Number of Uplink Forced Handover Users Every Timey
Abbreviated name UlMaxForHoNum
D i tiThis parameter indicates the maximum number of
l t d UE hi h f d t b h d d hDescription selected UEs which are forced to be handed over each time when uplink overload happens.
Range and Step [1, 50]a ge a d Step [ , 50]Default Value 5
UlMaxDrpUrNum
Parameter name Maximum Number of Uplink Forced Drop Users Every Time
Abbreviated name UlMaxDrpUrNum
D i tiThis parameter indicates the maximum number of
l t d UE hi h f d t b d d h tiDescription selected UEs which are forced to be dropped each time when uplink overload happens.
Range and Step [1, 50]a ge a d Step [ , 50]Default Value 5
UlSeriousOverLd
Parameter name Uplink Serious Overload Upper Limit(dB)Abbreviated name UlSeriousOverLdAbbreviated name UlSeriousOverLd
Description
This parameter indicates the upper limit of the uplink serious overload. The system is in the serious overload status if the uplink RTWP exceeds this threshold andDescription status if the uplink RTWP exceeds this threshold, and measures serious overload will be taken to decrease the load immediately.
R d St [0 62] dB t 0 1 dBRange and Step [0, 62] dB, step 0.1 dBDefault Value 62 dB
UlOverLd
Parameter name Uplink Overload Upper Limit(dB)Abbreviated name UlOverLdAbbreviated name UlOverLd
Description
This parameter indicates the upper limit of the uplink overload. The system is in the overload status if the uplink RTWP exceeds this threshold and measures ofp uplink RTWP exceeds this threshold, and measures of overload will be taken to decrease the load immediately.
Range and Step [0, 62] dB, step 0.1 dBDefault Value 61 dB
UlAlrmLd
Parameter name Uplink Overload Recovering Lower Limit(dB)Abbreviated name UlAlrmLdAbbreviated name UlAlrmLd
DescriptionA cell leaves overload state when its RTWP reported by Node B is lower than the threshold indicated by this
t f i d f tiparameter for a period of time.
Range and Step [0, 62] dB, step 0.1 dBDefault Value 57 dBDefault Value 57 dB
DlSeriousOverLd
Parameter name Downlink Serious Overload Upper Limit(%)Abbreviated name DlSeriousOverLdAbbreviated name DlSeriousOverLd
Description
This parameter indicates the upper limit of the downlink serious overload. The system is in the serious overload status if the download TCP exceeds this threshold andDescription status if the download TCP exceeds this threshold and measures of serious overload should be taken to decrease the downlink load immediately.
R d St [1 100]% t 1%Range and Step [1, 100]% step 1%Default Value 100%
DlOverLd
Parameter name Downlink Overload Upper Limit(%)Abbreviated name DlOverLdAbbreviated name DlOverLd
Description
This parameter indicates the upper limit of the downlink overload. The system is in the overload status if the downlink load exceeds this threshold and measures ofDescription downlink load exceeds this threshold and measures of overload should be taken to decrease the downlink load immediately.
R d St [1 100]% t 1%Range and Step [1, 100]%, step 1%Default Value 95%
DlAlrmLd
Parameter name Downlink Overload Recovering Lower Limit(%)Abbreviated name DlAlrmLdAbbreviated name DlAlrmLd
Description
This parameter indicates the lower limit for the downlink overload recovers. The system recovers from the overload status if the downlink load decreases below theDescription overload status if the downlink load decreases below the threshold. And the measures of decreasing the downlink load should be stopped.
R d St [1 100]% t 1%Range and Step [1, 100]%, step 1%Default Value 85%
HsdsOverLdThr
Parameter name Common Overload Threshold for HS-DSCH(%)Abbreviated name HsdsOverLdThrAbbreviated name HsdsOverLdThr
This parameter indicates the common overload threshold of the HS-DSCH. The system is in the overload status when the sum of HS DSCH Required
Descriptionoverload status when the sum of HS-DSCH Required Power and the transmitted carrier power of all codes not used for HS-PDSCH, HS-SCCH, E-AGCH, E-RGCH or E-HICH is over this threshold and measures should beE-HICH is over this threshold, and measures should be taken to decrease the load.
Range and Step [1, 100]%, step 1%Default Value 98%
HsdsRecoverThr
Parameter name Recover Threshold for HS-DSCH Overload(%)Abbreviated name HsdsRecoverThrAbbreviated name HsdsRecoverThr
Description
This parameter indicates the HS-DSCH overload recovery threshold. The system recovers from the HS overload status if the downlink load decreases below theDescription overload status if the downlink load decreases below the threshold and. Measures of decreasing the HS overload should be stopped.
R d St [1 100]% t 1%Range and Step [1, 100]%, step 1%Default Value 96%
NServToTotalPwr
Parameter name Target Non-serving E-DCH to Total E-DCH Power Ratio (%)( )
Abbreviated name NServToTotalPwrThis parameter indicates the threshold of nonserving E-DCH to total E DCH power ratio HSUPA overloadDescription DCH to total E-DCH power ratio. HSUPA overload control mechanism will be triggered when non-serving E-DCH to total E-DCH power ratio exceeds this threshold.
R d St [1 100]% t 1%Range and Step [1, 100]%, step 1%Default Value 15%
MaxRTWP
Parameter name Maximum Target Received Total Wideband Power (dB)Abbreviated name MaxRTWPAbbreviated name MaxRTWP
This parameter indicates the maximum target UL interference for a certain cell, including received wide band power from all sources which is an offset relative
Descriptionband power from all sources, which is an offset relative to the UL interference when there is no load in the cell. This parameter is used by the Node B scheduler. As a result of scheduling the total rising RTWP caused by theresult of scheduling, the total rising RTWP caused by the uplink services should not exceed this target value.
Range and Step [0, 62] dB, step 0.1 dBDefault Value 6 dB
