05-OWA200004 WCDMA Radio Resource Management

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OWA200004 OWA200004 WCDMA Radio Resource WCDMA Radio Resource

Management (RRM)Management (RRM)

ISSUE 1.0ISSUE 1.0

http://www.huawei.com


Chapter 1 Introduction to RRMChapter 1 Introduction to RRM

Chapter 2 Channel ConfigurationChapter 2 Channel Configuration

Chapter 3 Power ControlChapter 3 Power Control

Chapter 4 Mobility ManagementChapter 4 Mobility Management

Chapter 5 AMR Mode ControlChapter 5 AMR Mode Control


Introduction to RRM

ll RRM: Radio Resource ManagementRRM: Radio Resource Management

ll RRM is responsible for supplying optimum coverage, offering RRM is responsible for supplying optimum coverage, offering the maximum planned capacity, guaranteeing the required the maximum planned capacity, guaranteeing the required quality of service (QoS) and ensuring efficient use of physicalquality of service (QoS) and ensuring efficient use of physicaland transport resourcesand transport resources

ll Power is the ultimate radio resource. The best way to utilize Power is the ultimate radio resource. The best way to utilize the radio resource is to control the power consumption strictlythe radio resource is to control the power consumption strictly

[[ Increasing the transmission power of a given user can Increasing the transmission power of a given user can improve his QoSimprove his QoS

[[However, due to the selfHowever, due to the self--interference, the increasing power interference, the increasing power would result in more interference on other users and would result in more interference on other users and consequently reduce the receiving QoSconsequently reduce the receiving QoS


Procedure of RRM

ll Fundamental procedure of radio resource managementFundamental procedure of radio resource management

[[Measurement controlMeasurement control

[[measurementmeasurement

−− UE, NodeB, RNCUE, NodeB, RNC

[[Measurement reportMeasurement report

[[ JudgmentJudgment

[[ Implementation Implementation






Chapter 5 AMR Mode controlChapter 5 AMR Mode control



2.1 Fundamental channel configuration2.1 Fundamental channel configuration

2.2 Dynamic channel configuration2.2 Dynamic channel configuration


Fundamental Channel ConfigurationFundamental Channel Configurationll Objective: mapping the RAB QoS features requested onto distributObjective: mapping the RAB QoS features requested onto distribute e

appropriate channelappropriate channel

ll QoS requested by CNQoS requested by CN

[[Traffic ClassesTraffic Classes

−− ConversationalConversational

−− StreamingStreaming

−− InteractiveInteractive

−− BackgroundBackground

[[Rate demandRate demand

[[Quality demand (BLER)Quality demand (BLER)

[[Time delayTime delay

[[Delivery orderDelivery order


QoS MappingQoS Mapping

DPDCH DPCCH

RAB

RB RB

DTCH DTCH DCCH

TrCHTrCH TrCH

CCTrCH

RLC entity

Mac-d Mac-c

Coding& RM&Mux

Radio Bearers

RLC Sublayer

Logical Channels

MAC Sublayer

Transport Channels

Physical Layer

DTCH

．．．

Coding& RM&Mux

TrCH


RB and RLC Parameter Configurationll RB parametersRB parameters

[[RB numberRB number

ll RLC parametersRLC parameters

[[Different RLC transfer modesDifferent RLC transfer modes

−− transparent mode (TM)transparent mode (TM)

−− Unacknowledged mode (UM)Unacknowledged mode (UM)

−− Acknowledged mode (AM)Acknowledged mode (AM)

[[Different logic channel parametersDifferent logic channel parameters


MAC Parameter Configuration

ll MAC parametersMAC parameters

[[The mapping/multiplexing relation between logic channel The mapping/multiplexing relation between logic channel and transport channeland transport channel

[[Different types and parameters of transport channelDifferent types and parameters of transport channel

−− Dedicated channelDedicated channel

−− Common channelCommon channel

[[Different configurations of MAC entityDifferent configurations of MAC entity

−− MACMAC--d/MACd/MAC--cc

[[Priority configuration of MAC sub layerPriority configuration of MAC sub layer

[[TFCS configurationTFCS configuration


PHY Parameter Configurationll PHY parametersPHY parameters

[[Mapping relation from transport channel to physical channelMapping relation from transport channel to physical channel

[[Channel Coding schemeChannel Coding scheme

−− Convolutional codeConvolutional code

−− Turbo codeTurbo code

−− NonNon

[[ Interleaving lengthInterleaving length

[[Rate matching attribute Rate matching attribute

[[Spreading factor (SF)Spreading factor (SF)

[[Power offsetPower offset

[[Other physical channel parameters, such as diversity mode, etc.Other physical channel parameters, such as diversity mode, etc.



2.1 Fundamental channel configuration2.1 Fundamental channel configuration

2.2 Dynamic channel configuration2.2 Dynamic channel configuration


DCCC: Dynamic Channel Configuration ControlDCCC: Dynamic Channel Configuration Control

ll Object of DCCC: Best Effort (BE) serviceObject of DCCC: Best Effort (BE) service

ll Features of BE serviceFeatures of BE service

[[ rate of service source changes largelyrate of service source changes largely

[[Less demand on time delayLess demand on time delay

[[More demand on bit error rateMore demand on bit error rate


Dynamic Channel ConfigurationDynamic Channel Configuration

MAC-d

DL Transport Channel Traffic Volume

Threshold

Configuration in L2

RLC

Signaling bearer

DCH1

RLC

TFC SelectTFC Select

DCH2

Channel SwitchingChannel Switching

DCCH DTCH


Decision of DCCC

ll Decision of DCCCDecision of DCCC

[[Measurement report on traffic volume of RLC BufferMeasurement report on traffic volume of RLC Buffer

[[Decide whether to change the bandwidth used by UE Decide whether to change the bandwidth used by UE dynamically based on the measurement resultdynamically based on the measurement result

[[Consider whether there is limitation on air interface during theConsider whether there is limitation on air interface during thedecision of reconfigurationdecision of reconfiguration

The uplink & downlink DCCC decisions are the same, but are executed respectively.


Effect of DCCC

System capacity

Traditional channel configuration

Rate of service source

DCCC

Achieve “bandwidth on demand”

Time

rate


Near-far effect in CDMANear-far effect in CDMA

A B

ω

P(ω)

ω

P(ω)

ω

P(ω)

ω

P(ω)

Received power from user A

ω

P(ω)

Despreading

Transmission power of user A

Received power by NodeB

The user A can communicate successfully

Received power from user B

Transmission power of user A

The user B is submerged because of strong interference

from user A

user A

user B


Classification of Power Control

l Power Control[Uplink power control

− Open loop power control− Closed loop power control

▪ Inner loop power control▪ Outer loop power control

[Downlink power control− Open loop power control− Closed loop power control

▪ Inner loop power control▪ Outer loop power control


Open Loop Power Control for DPCH

l Accurately calculate initial transmitting power of inner loop needed to lessen the time of convergence

l Reduce the impact on system load

Convergence of inner loop power control

time

power

time

power


NodeB UERACH

BCH: CPICH channel powerUL interference level

Open Loop Power Control for PRACH


Uplink Closed Loop Power ControlUplink Closed Loop Power Control

NodeB UE

Transmit TPC

Measure&compare SIR of received signal

Inner loop

Set SIRtar

1500Hz


BLER--SIR

SIR

BLER

Different curves correspond with different multi-path environment


Uplink Closed Loop Power ControlUplink Closed Loop Power Control

NodeB UE

Transmit TPC

Measure&compare SIR of received signal

Inner loop

Set SIRtar

Traffic data with steady BLER can be acquired

Measure BLER of transport channel

Outer loop

RNC

Measure&compare BLER of received data

Set BLERtar

10-100Hz


Downlink Power Control

NodeB

Set SIRtar

Transmit TPC

Measure and compare SIR

Measure and compare BLER

Outer loop

Inner loop UE physical layer

UE Layer 3

Downlink inner loop and outer loop power control

10-100Hz1500Hz


UE Working Modes and states

l Idle mode

l Connected mode

[Cell_DCH

[Cell_FACH

[Cell_PCH

[URA_PCH


UE Working Modes and statesl Idle Mode[ The UE has no relation to UTRAN, only to CN. For data transfer, a signalling

connection has to be established

[UE camps on a cell− It enables the UE to receive system information from the PLMN− UE can establish an RRC connection, it can do this by initially accessing the

network on the common channel of the cell on which it is camped− UE can receive "paging" message from PCH

[The idle mode tasks can be subdivided into three processes− PLMN selection and reselection− Cell selection and reselection− Location area registration



l Connected Mode – Cell_DCH

[ In active state

[Communicating via its dedicated channels

[UTRAN knows the cell in which UE is located.



l Connected Mode – Cell_FACH

[ In active state

[Few data to be transmitted both in uplink and in downlink. There is no need to allocate dedicated channel for this UE

[Downlink uses FACH and uplink uses RACH

[UE needs to monitor the FACH for its relative information

[UTRAN knows the cell in which UE is located



l Connected Mode – Cell_PCH

[No data to be transmitted or received

[DRX (discontinuous reception) monitor PICH, to receive its paging

[ lower the power consumption of UE

[UTRAN knows the cell in which UE is located

[UTRAN has to update cell information of UE when UE roams to another cell



l Connected Mode – URA_PCH

[No data to be transmitted or received

[DRX monitor PICH

[UTRAN only knows the URA in which UE is located

[UTRAN updates UE information only after UE has roamed to other URA (UE report own new URA by URA update procedure)

[A better way to lower the resource occupancy


UE states switching

CELL_DCH CELL_FACH

CELL_PCHURA_PCH

IDLE

DEAD - Scanning networks (PLMN)- ”Camp on” cell

- Monitor paging channel- cell re-selection

- Dedicated Channel- Radio bearers Transmission Services - upper layer Signaling

trigger (CN)

- Reduce action，DRX，and save power

RRC connection


UE move

Target BSSource BS

time

Data UE received/

sent

“GAP” of communication

Hard handoverHard handover


Soft Handover

UE move

Target BSSource BS

time

Data UE received

/ sentNo “GAP” of communication


The Basic Concept of SHO

l Active Set

[ Including all cells currently participating in a SHO connection of a UE

l Monitored Set

[ Including all cells being continuously monitored by the UE and which are not current included in its active set

l Detected set

[ Including the cells the UE has detected but are neither in the active set nor in the monitored set


Three Steps of Handover

Decision

Implementation

Measurement


Application of Hard Handover in 3G

l Intra-frequency hard handover

[When inter-RNC SHO can’t be executed or is not allowed

l Inter-frequency hard handover

[Needed in certain areas due to network planning

[Load balance between frequencies

l Inter-RAT handover

[2G-3G smooth evolution

[The finite coverage range of initial phase of 3G


Compressed Mode

Objective of compressed mode: for UE to realize measurement and synchronization to target cell when inter-frequency handover and inter-system handover is required


Classification of Compressed Mode

l Downlink compressed mode

[To create time for UE’s measurement and synchronization.

[2 optional schemes -- SF/2,higher layer scheduling

l Uplink compressed mode

[To avoid the interference on its own downlink measurement and synchronization when UE is measuring certain target frequency or RAT

[2 optional schemes -- SF/2, higher layer scheduling


SRNC Relocation

l Advantage of SRNC relocation

[Reducing data flow on Iur interface

[ Improving the system’s adaptability.

[Reducing the time delay

l Problem of SRNC Relocation: a large amount of signaling is needed to interact.

CN

SRNC DRNC

CN

RNC SRNC






Chapter 5 AMR Mode ControlChapter 5 AMR Mode Control


AMR CodingAMR Codingl WCDMA system uses Adaptive Multi-Rate (AMR) speech

code, which is linear prediction coding

Rate no.

Sub-flow 1 block size（bit）



Combination block size（bit）

rate（kbps）

0 0 0 0 0 No data 1 39 0 0 39 SID 2 42 53 0 95 4.75 3 49 54 0 103 5.15 4 55 63 0 118 5.9 5 58 76 0 134 6.7 6 61 87 0 148 7.4 7 75 84 0 159 7.95 8 65 99 40 204 10.2 9 81 103 60 244 12.2


Features of AMR speech: MOS-CIR


AMR Mode Control

l AMR mode control is to weigh the load level, and:

[Reduce AMR speech rate on heavy load condition, thus reduce the system load and improve speech quality relatively

[ Increase AMR speech rate on light load condition, thus improve QoS

l Reducing of AMR speech rate can widen the uplink coverage effectively

l The AMR speech mode control can be done in every 20ms

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05-OWA200004 WCDMA Radio Resource Management

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