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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