Best Effort Traffic Control Algorithm.ppt
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Best Effort Traffic Control Algorithm
2004-032004-03
Best Effort Traffic Control Algorithm
2004-032004-03
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DCCC
Link Quality Check
UE State Transitions
DCCC
Link Quality Check
UE State Transitions
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DCCC
• Why DCCC
• What is DCCC
• How to DCCC
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Why DCCC
• Uu code resource is limited• Iub/Iu band resource is limited• 3G best effort traffic attribute
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What is DCCC
• DCCC: Dynamic Channel Configuration Control• aim: make full use of radio resource (also Iub/Iu)
- Configured bandwidth is fixed when no DCCC- Configured bandwidth is changing when DCCC- Traffic rate
Rate or band
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How to DCCC
Measurement reportMeasurement report
DCCC decisionDCCC decision
Traffic Volume measurement control
Traffic Volume measurement control
UE and RNC MeasurementUE and RNC Measurement
DCCC executionDCCC execution
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Traffic Volume Measurement
Threshold
Transport Channel Traffic Volume
Reporting event 4A
Time
Reporting event 4A
Threshold
Transport Channel Traffic Volume
Reporting event 4B
Time
Reporting event 4B
Reporting event 4B
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Measurement Parameters
• Traffic volume measurement– 4a
• Threshold• Time to trigger• Pending time after trigger
– 4b• Threshold• Time to trigger• Pending time after trigger
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DCCC decision
• If DCCC switch is on,initial rate is full coverage rate
• When 4a event -> increase bandwidth• When 4b event -> decrease bandwidth• Set DCCC threshold,if current bandwidth<
=DCCC threshold,don’t decrease bandwidth
• If in SHO state,take into account SHO threshold rate
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DCCC execution
• UL/DL bandwidth adjustment by RB reconfiguration
Uu Iub
UE-RRC UE-MACUE-RLC UE-PHY NodeB-PHY RNC-MAC
CMAC-MEASUREMENT-REQ
DCCH: MEASUREMENT CONTROL Message[Traffic Volume Measurement]
MAC-DATA-REQ
MAC-DATA-REQ
CMAC-MEASUREMENT-IND
DCCH: MEASUREMENT REPORT Message[Traffic Volume Measurement]
Thresholdexceeds
Decide toreport
RNC-RLC RNC-RRC
Choose Actionaccordingly
Radio Bearer Control Procedures[Bearer Reconfiguration / Transport Channel Reconfiguration / Physical Channel Reconfiguration / Transport Format Combination Control
BCCH: System Information Message[Traffic Volume Measurement]
MAC-DATA-REQ
ReportInterval
CMAC-MEASUREMENT-IND
ReportInterval
CMAC-MEASUREMENT-IND
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DCCC
Link Quality Check
UE State Transitions
DCCC
Link Quality Check
UE State Transitions
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Why Link Quality Check
• Because of DL code and power resource is limited,high bit rate traffic such as 384k can’t covered somewhere,if the UE move to this place the call will drop.Using Link Quality Check,the
PS traffic can be covered continuously as following.
基站
Data of 144kbps
Data of 64kbps
Voice
Data of 384kbps
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How to Link Quality Check
Measurement reportMeasurement report
Link Quality Check decisionLink Quality Check decision
DL Transmitted Code Power measurement
DL Transmitted Code Power measurement
NodeB MeasurementNodeB Measurement
RB Reconfiguration execution
RB Reconfiguration execution
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DL Transmitted Code Power Measurement
T1T1
Measuredentity
Time
MeasurementThreshold 1
MeasurementThreshold 2
T1 – Measurement Hysteresis Time
T1
Report A Report BPeriodicReports
Report A PeriodicReport
Measurement Reports
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Tx Code Power Measurement Parameter
• Event E– Ea relative threshold– Eb relative threshold– filter coefficient– hysteresis time– report period
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Link Quality Check decision and executionLink Quality Check decision and execution
• If DL Transmitted Code Power event Ea is triggered,decreasing DL bandwidth and start a timer when DCCC switch is off .
• If the timer elapses,resume the bandwidth.
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DCCC
Link Quality Check
UE State Transitions
DCCC
Link Quality Check
UE State Transitions
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UE State Transitions
Establish RRCConnection
Release RRCConnection
UTRA RRC Connected Mode
UTRA:Inter-RATHandover
GSM:Handover
Establish RRCConnection
Release RRCConnection
URA_PCH CELL_PCH GSMConnected
Mode
Establish RRConnection
Release RRConnection
Idle Mode
Camping on a UTRAN cell1 Camping on a GSM / GPRS cell1
GPRS Packet Idle Mode1
GPRSPacket
TransferMode
Initiation oftemporaryblock flow
Release oftemporaryblock flow
Cell reselection
CELL_DCH
out of service
in service
CELL_FACH
out of service
in service
out of service
in service
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Why UE state transitionsWhy UE state transitions
• Save radio resource
• Save UE power and battery
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CELL_DCH ↔ CELL_FACH
• Traffic volume measurement
• In CELL_DCH, If in a given period the times of zero traffic volume report reaches a given threshold, doing CELL_DCH → CELL_FACH
• In CELL_FACH, if 4a event is triggered,
doing CELL_FACH → CELL_DCH
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CELL_FACH → CELL_PCH
• Traffic volume measurement
• If in a given period the times of zero traffic
volume report reaches a given threshold, doing CELL_FACH →CELL_PCH
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CELL_PCH → URA_PCH
• If in a given period the times of CELL Update reason which is “cell reselect” reaches a configured threshold,
doing CELL_PCH → URA_PCH
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