UMTS Course EPFL 21.12.04 Part 1 2

8/6/2019 UMTS Course EPFL 21.12.04 Part 1 2

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121/12/2004 A. LEHERICEY UMTS course

UMTS course

Introduction

UMTS principles

Network Architecture

WCDMA Basics General Protocols Model

Radio Resource Management and ATM transmission

UMTS Evolution

HSDPA TDD

All IP

UMTS Project

Network Architecture and Design Rollout

System Acceptance Testing

Network Performances

Launch


2/35


Radio Interface Protocols

Architecture

control

Logical Channels

Transport Channels

PHY (WCDMA L1)

RLC

MAC

RLC

RLC

RLC

RLC

RLC

RLC

RLC

BMC

RRC control

control

control

control

L3

L2

L1

User PlaneControl Plane

RadioBearers

PDCP


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Uu interface Layer 1 Services

L1 services :

Information transfer to MAC and higher layers on common and dedicated transportchannels:

Random Access Channel (RACH)

Common Packet Channel (CPCH)

Forward Access Channel (FACH)

Downlink Shared Channel (DSCH)

Broadcast Channel (BCH)

Paging Channel (PCH)

Dedicated Channel (DCH)


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Uu interface Layer 1 Functions

L1 functions:

Macrodiversity distribution/combining and soft handover execution

Error detection on transport channels and indication to higher layers

FEC encoding/decoding and interleaving/deinterleaving of transport channels

Multiplexing of transport channels and demultiplexing of coded composite transportchannels

Rate matching

Mapping of coded composite transport channels on physical channels;

Power weighting and combining of physical channels

Modulation and spreading/demodulation and despreading of physical channels

Frequency and time (chip, bit, slot, frame) synchronisation

Measurements and indication to higher layers (e.g. FER, SIR, interference power, transmitpower, etc.)

Closed-loop power control

RF processing


5/35


Medium Access Control Protocol:

MAC Services

MAC Services to upper Layer: Data transfer service on logical channels classified in control and traffic channels

Reallocation of radio resources and MAC parameters.

Reporting of measurements.


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Medium Access Control Protocol:

MAC Functions

MAC Functions:

Mapping between logical channels and transport channels.

Selection of appropriate Transport Format for each Transport Channel depending oninstantaneous source rate.

Priority handling between data flows of one UE.

Priority handling between UEs by means of dynamic scheduling

Identification of UEs on common transport channels

Multiplexing/demultiplexing of upper layer PDUs into/from transport blocks deliveredto/from the physical layer on common transport channels.

Multiplexing/demultiplexing of upper layer PDUs into/from transport block sets deliveredto/from the physical layer on dedicated transport channels.

Traffic volume measurement.

Transport Channel type switching.

Ciphering.

Access Service Class selection for RACH and CPCH transmission


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Radio Link Control Protocol:

RLC Services

RLC Services to upper layer:

Transparent data transfer.

Notification of unrecoverable errors

Maintenance of QoS as defined by upper layers

Unacknowledged data transfer QoS setting

Acknowledged data transfer.


8/35


RLC Functions

Segmentation and reassembly

Concatenation

Padding

Transfer of user data

Error correction

In-sequence delivery of upper layer PDUs Duplicate Detection

Flow control

Sequence number check

Protocol error detection and recovery Ciphering

Radio Link Control Protocol:

RLC FunctionsRLC Functions

Polling

Status transmission

SDU discard

Estimated PDU Counter (EPC) mechanis

Suspend/resume function Stop/continue function

Re-establishment function


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Air Interface Protocols

RRC

RRCRRC

ControlPlane

UE WBTS

RLC

SRNC

MAC

FPFPWCDMA

L1

RLC

WCDMAL1

MAC

FP

DRNC

Transport andtransmission

layer


layer


layers


10/35


Radio Resource Control Protocol:

RRC functions Broadcast of information related to the non-access stratum (Core Network);

Broadcast of information related to the access stratum;

Establishment, maintenance and release of an RRC connection between the UE and UTRAN;

Establishment, reconfiguration and release of Radio Bearers;

Assignment, reconfiguration and release of radio resources for the RRC connection;

RRC connection mobility functions;

Control of requested QoS;

UE measurement reporting and control of the reporting;

Outer loop power control;

Control of ciphering;

Paging;

Initial cell selection and cell re-selection;

Arbitration of radio resources on uplink DCH;

RRC message integrity protection;

CBS control.


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Air Interface Protocols

UserPlane

PDCP

NRT & RTRT

UE WBTS

RLC

SRNC

MAC

FPFPWCDMA

L1

RLC

WCDMAL1

MAC

FP

DRNC


layer


layer


layers

PDCP

NRT & RTRT


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TransportNetwork

Layer

RadioNetwork

Layer

ALCAP(s)

SignallingBearer(s)

ApplicationProtocol

SignallingBearer(s)

DataStream(s)

DataBearer(s)


Transport

NetworkControl Plane

Transport

NetworkUser Plane

Transport

NetworkUser Plane

Physical Transmission layer

General Protocol Model


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Protocol Structure for Iub

3G TS 25.430

TransportNetwork

Layer

RadioNetwork

Layer

Q.2630.1

NBAP

D

CH

F

P

AAL2

Transport NetworkUser Plane


ATM

Transport NetworkControl Plane


AAL5

SSCF-UNISSCOP

AAL5

Q.2150.2SSCF-UNI

SSCOP

RA

CH

F

P

FA

CH

F

P

P

CH

F

P

DS

CH

F

P

CP

CH

F

P



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NBAP specific elementary procedures

Radio Link Management. Radio Link Supervision. Compressed Mode Control Measurements on Dedicated Resources DL Power Drifting Correction

Reporting of General Error Situations

Functions have same elementaryprocedures as RNSAP

Function Elementary Procedure(s)Cell Configuration Management a) Cell Setup

b) Cell Reconfigurationc) Cell Deletion

Common Transport Channel Management a) Common Transport Channel Setupb) Common Transport Channel Reconfigurationc) Common Transport Channel Deletion

System Information Management System Information UpdateResource Event Management a) Block Resource

b) Unblock Resource

c) Resource Status IndicationConfiguration Alignment a) Audit Requiredb) Auditc) Reset

Measurements on Common Resources a) Common Measurement Initiationb) Common Measurement Reportingc) Common Measurement Termination

d) Common Measurement Failure


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Protocol Structure for Iur

TransportNetworkLayer

RadioNetwork

Layer

Q.2630.1

RNSAPDCHFP

AAL2



ATM



AAL5

SCCPMTPb3

SSCF-NNISSCOP

AAL5

Q.2150.1MTPb3

SSCF-NNISSCOP

CCHFP



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RNSAP Radio Network Subsystem

Application Part

RNSAP defines interactions between SRNC and DRNC over Iub interface

RNSAP consists of Elementary Procedures (EP)'s, here Class 1 and Class 2

RANAP provide following servicesRNSAP Basic Mobility Procedures (Related to a specific UE)RNSAP DCH ProceduresRNSAP Common Transport Channel ProceduresRNSAP Global ProceduresSupport of parallel transactions

RANAP services expected from Signalling TransportConnection oriented data transfer serviceConnectionless data transfer service

RNSAP Function

EP (class1) EP (class2)

Request Message

Success Failure


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Protocol Structure for Iu-CS


RadioNetwork

Layer

Q.2630.1

RANAP

Iu User Plane

Protocol

AAL2

ATM

Control Plane


User Plane


AAL5

SCCPMTP3

SSCF-NNISSCOP

AAL5

Q.2150.1MTP3

SSCF-NNISSCOP




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RANAP Radio Access Network

Application Part for Iu-CSRANAP defines interactions between RNS and CN

RANAP consists of Elementary Procedures (EP)

Class 1: EP's with response, success or failureClass 2: EP's without responseClass 3: EP's with possibility of multiple responses

RANAP provide following signalling servicesGeneral control services

Notification servicesDedicated control services

RANAP services expected from Signalling TransportConnection oriented data transfer serviceConnectionless data transfer service

General RANAP functionsManagement of Iu resources, signalling and RAB'sTransport of NAS signalling messages between UE and CNControlling the security mode in the UTRAN (ciphering and integrity protection)Controlling and transferring location reporting

Data volume reporting for unsuccessfully transmitted DL DataUE Management like paging, UE Common ID sending, controlling UE activity tracing


20/35


Protocol Structure for Iu-PS


RadioNetwork

Layer RANAPIu User Plane

Protocol



ATM



AAL5

SCCPMTPb3

SSCF-NNISSCOP

AAL5

GTP-UUDP

IP



21/35


RANAP Radio Access Network

Application Part for Iu-PS Radio Access Bearer (RAB) Management functions

Radio Resource Management functions

Iu link Management functions

Iu User-plane (RNL) Management

Mobility management functions

Security functions

Service and Network Access functions

Iu Co-ordination functions

Separation of each UE for mobile specific signalling management

Relocating the SRNS to another RNS and changing the IU connection point for a UE(streamlining)

Transfer of transparent non-access signalling


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UMTS course

Introduction

UMTS principles

Network Architecture

WCDMA Basics General Protocols Model

Radio Resource Management and ATM transmission

UMTS Evolution

HSDPA TDD

All IP

UMTS Project

Network Architecture and Design

Rollout

System Acceptance Testing

Network Performances

Launch


23/35


Radio Resource Management

BLER or BERtarget, SIR target

RRC Connection Request

RBinformation

Resource

information

Active setinformation

Load

information

Admission Control

RRC admission decision Default set of transport

channel and RLCparameters

(Directed RRCconnection set-up)

Load Control

Power Control

UL Outer LoopPower Control

Handover Control

Active state mobility

control

Resource Manager

Code allocationTransport resource allocation

info

PacketScheduler

Radio resourcescheduling

Cell load

status

Load change

information

Iub


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Admission Control

Radio Access Bearersin Uu Interface

UuInter

faceBa

ndwi

dth

SIR - Allowed Rang

Admission Control


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Hand Over Control

4

B SSector 1f1

Sector 2f1

Sector 3f1

Multipath Signalthrough Sector 1

Multipath Signalthrough Sector 3

4

B SB S

Frequencyf1

Frequencyf1

R N C R N CIur

Iub Iub

Softer

HO

Hard Intra FrequencyHO

4

B TSB S

WCDMA GSM900/1800

Inter System

HO

4

B SB S

Frequencyf1

Frequencyf1

4

B SB S

Frequencyf1

Frequencyf2

Soft HO

Hard Inter FrequencyHO


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Resource Manager

Primary Scrambling Code

Secondary Scrambling Code #1



Channelisation Code Set (256 Codes)




Primary Scrambling Code








- 512 Code Sets x 16 Scrambling Codes = 8192 Codes numbered from 0 ... 8191 available


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Power Control

4

B SRNC

Open Loop Power Control (Initial Access)

Closed Loop Power Control

Outer Loop Power Control


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Packet Scheduler

time

packet service session

packet call

reading time

packet size packet arrival interval


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Load Control

Overload

Load Target

Overload Margin

Power

Estimated capacity forNRT traffic.

Measured load causedby non-controllable load


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ATM in Brief (1/6)

Header (5 bytes)Payload (48 bytes)

ATM Cell

GFC VPI

VPI VCI

VCI

VCI PT CL

HEC

Payload Data 48 Bytes

1 2 3 4 5 7Bit number:

He

ader(5Bytes

GFC = Generic Flow

VPI = Virtual Path IdentifierVCI = Virtual ChannelPT = Payload TypeCLP = Cell Loss PriorityHEC = Header Error Control


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ATM in Brief (2/6)

48 bytes

5 bytes

HEADER PAYLOAD

ATM cell (53 bytes)

Transmission pathVirtual Path (VP)Virtual Channel (VC)ATM CellATM Layer

HEADER

PAYLOAD

ATM i B i f (3/6)


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ATM in Brief (3/6)

AAL2

String of AAL2 Packet Data Units String of AAL2 Packet Data Units

31 2 3 1 2

AAL2 header

HEADER PAYLOADATM cell

3ATM CELLHEADERATM CELLHEADER1 2 3 1 1 2

OFFSET FIELD, 1-byte (indicates where the next AAL2 PDU starts)

AAL2 PACKET, 3-byte header, variable length payload (packet size up to 48 bytes or fixed 64 bytes)

ATM CELL, 5-byte header + 48-byte payload

PADDING

e.g., 3 differentusers

ATM i B i f (4/6)


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ATM in Brief (4/6)

AAL5

PADDING FIELD, variable length to fill the 48-byte ATM cell

AAL5 PACKET, 5-byte header, variable length payload, 8-byte trailer

ATM CELL, 5-byte header + 48-byte payload

USER DATA = Variable length 1-65,535 bytes USER DATA = Variable length 1-65,535 bytes

AAL5 Packet Data Unit AAL5 Packet Data Unit

AAL5 header

PAYLOAD= N x 48 BYTES

ATM cell 1 ATM cell 2... ..ATM cell n

ATM in Brief (5/6)


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ATM in Brief (5/6)

ATM over E1

Header Payload

ATM cell

0 1 2 16 1817 3115

TS0TS1-15

TS16TS17-31

. . . . ..

0 1 2 16 1817 3115

TS0TS1-15

TS16TS17-31

. . . . ..

E1 frameE1 frame

ATM in Brief (6/6)


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ATM in Brief (6/6)

ATM over SDH

STM-1 (155,52 Mbps) can fit 44.15 cells per frame -> 353 207 cells per second.

VC-4

VP1

VP2

VP3

Section

Overhead

.

.

.

260 bytes

9 bytes

P

O

H

9 bytes

1 byte

VC-4

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UMTS Course EPFL 21.12.04 Part 1 2

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