UMTS course - EPFL 21.12.04 Part 1-2ica · UMTS course Introduction UMTS principles Network...

121/12/2004 A. LEHERICEY – UMTS course

UMTS courseIntroductionUMTS principles

Network ArchitectureWCDMA BasicsGeneral Protocols ModelRadio Resource Management and ATM transmission

UMTS EvolutionHSDPATDDAll IP

UMTS ProjectNetwork Architecture and DesignRolloutSystem Acceptance TestingNetwork PerformancesLaunch


Radio Interface Protocols Architecture

cont

rol

Logical Channels

Transport Channels

PHY (WCDMA L1)

RLC

MAC

RLCRLCRLC

RLCRLC

RLCRLC

BMC

RRC control

cont

rol

cont

rol

cont

rol

L3

L2

L1

User PlaneControl Plane

RadioBearers

PDCP


Uu interface Layer 1 Services

L1 services :• Information transfer to MAC and higher layers on common and dedicated transport channels:• 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)


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 transport channels• 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, transmit power, etc.)• Closed-loop power control• RF processing


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.


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 on instantaneous 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 delivered to/from the physical layer on common transport channels. • Multiplexing/demultiplexing of upper layer PDUs into/from transport block sets delivered to/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


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.


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 Functions

RLC Functions•…• Polling• Status transmission• SDU discard• Estimated PDU Counter (EPC) mechanism• Suspend/resume function• Stop/continue function• Re-establishment function


Air Interface ProtocolsRRC

RRCRRC

ControlPlane

UE WBTS

RLC

SRNC

MACFPFP

WCDMA L1

RLC

WCDMA L1

MACFP

DRNC

Transport and transmission

layer


layer


layers


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.


Air Interface Protocols

UserPlane

PDCP

NRT & RTRT

UE WBTS

RLC

SRNC

MACFPFP

WCDMA L1

RLC

WCDMA L1

MACFP

DRNC


layer


layer


layers

PDCP

NRT & RTRT


Downlink Uplink

DS-WCDMA-FDD = Direct Sequencing, WCDMA Frequency Division Duplex. Suitable for outdoor use, and will be the first implementation in 3G. In the Case of DS, data is spread over the band as a function of time.

Logical Channels

In the DS-WCDMA-FDD model, there are 3 layers. The first and top-most layer are the logical channels, which carry specific information per channel.

SCH

In WCDMA, the network must provide source information, which the UE is able to start network access. The logical channel containing this information is called the Sychronisation Channel.

BCCH

The network must inform the UE about the radio environment, the information consists of codes, power levels, neighboring information and etc.. The information for the UE is carried in the Broadcast Control Channel.

PCH

When there is need to reach the mobile station, the network pages the UE on the Paging Channel.

CCCH

All common actions that the network must perform for all UE's in a cell are managed in the Common Control Channel.

DCCH

When there is a dedicated, active connection, the network sends control information through the Dedicated Control Channel.

DTCH

The dedicated user traffic for one user service in the downlink direction is sent through the Dedicated Traffic Channel.

CCCH DTCH DCCH

In the Uplink direction, there are the Common Control Channel, Dedicated Traffic Channel and the Dedicated Control Channel.

Transport Channels

The second level is known as the Transport Channels. In some cases, a transport channel may contain one or more logical channels.The SCH, BCCH and PCH Transport Channels carry their respective logical channels (Scnchronisation, Broadcast and Paging Channels).

SCH BCH PCH FACH

The FACH (Forward Access Channel) carries information (when specified by RNC) from the common and dedicated control channels.

DCH DCH

The DCH (Dedicated Control Channel) is the only dedicated transport channel, the rest are common. One DCH channel, may carry one or more DTCH.

RACH

In the Uplink, and as in GSM, the RACH (Random Access Channel) carries initial access information when required.

CPCH

The Common Packet Channel is used to carry packet(s), providing the common resources of the system are used for this purpose.

Physical Channels

The final layer use in the channels, is known as the physical channels. These are the channels that are present on the air-interface of a cell.The Network Synchronisation information is carried in the Synchronisation Physical Channel.

SCH1/2 CCPCH-1 CCPCH-2

There are 2 Common Control Physical CHannels, primary and secondary. The primary carries the cell information, whereas the secondary carries other common control information.

DPCH (DPDCH+DPCCH)

The DPCH (Dedicated Physical Channel) is a multiplexed combination of the DPDCH (dedicated user traffic) and the DPCCH (dedicated signaling channel)..

PRACH

The Physical Random Access CHannel carries the RACH data.

DPDCH DPCCH

The user's traffic and signaling information is divided in the uplink direction between the DPDCH and DPCCH physical channels.

PCPCH

Channels DS-WCDMA-FDD


TransportNetworkLayer

RadioNetworkLayer

ALCAP(s)

SignallingBearer(s)

Application Protocol

SignallingBearer(s)

Data Stream(s)

Data Bearer(s)


TransportNetwork

Control Plane

TransportNetwork

User Plane

TransportNetwork

User Plane

Physical Transmission layer

General Protocol Model


Protocol Structure for Iub

3G TS 25.430


RadioNetworkLayer

Q.2630.1

NBAP

DC

H

FP

AAL2

Transport NetworkUser Plane


ATM

Transport NetworkControl Plane


AAL5

SSCF-UNISSCOP

AAL5

Q.2150.2SSCF-UNI

SSCOP

RA

CH

FP

FAC

H

FP

PC

H

FP

DS

CH

FP

CP

CH

FP



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 elementary procedures 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 Resourcec) Resource Status Indication

Configuration Alignment a) Audit Requiredb) Auditc) Reset

Measurements on Common Resources a) Common Measurement Initiationb) Common Measurement Reportingc) Common Measurement Terminationd) Common Measurement Failure


Protocol Structure for Iur


RadioNetworkLayer

Q.2630.1

RNSAP DCH FP

AAL2



ATM



AAL5

SCCPMTPb3

SSCF-NNISSCOP

AAL5

Q.2150.1MTPb3

SSCF-NNISSCOP

CCH FP



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


Protocol Structure for Iu-CS


RadioNetworkLayer

Q.2630.1

RANAP Iu User Plane Protocol

AAL2

ATM

Control Plane


User Plane


AAL5

SCCPMTP3

SSCF-NNISSCOP

AAL5

Q.2150.1MTP3

SSCF-NNISSCOP




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


Protocol Structure for Iu-PS


RadioNetworkLayer RANAP Iu User Plane

Protocol



ATM



AAL5

SCCPMTPb3

SSCF-NNISSCOP

AAL5

GTP-UUDP

IP



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


UMTS courseIntroductionUMTS principles

Network ArchitectureWCDMA BasicsGeneral Protocols ModelRadio Resource Management and ATM transmission

UMTS EvolutionHSDPATDDAll IP

UMTS ProjectNetwork Architecture and DesignRolloutSystem Acceptance TestingNetwork PerformancesLaunch


Radio Resource Management

BLER or BER target, SIR target

RRC Connection Request

RB information

Resourceinformation

Active setinformation

Loadinformation

Admission Control

• RRC admission decision• Default set of transport

channel and RLC parameters

• (Directed RRC connection set-up)

Load Control

Power Control

UL Outer LoopPower Control

Handover Control

Active state mobility control

Resource Manager

Code allocationTransport resource allocation

info

Packet Scheduler

Radio resourcescheduling

Cell load status

Load changeinformation

Iub


Admission Control

Radio Access Bearersin Uu Interface

Uu Interface

Bandwidth

SIR - Allowed RangeAdmission Control


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 Frequency HO

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 Frequency HO


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


Power Control

4

BS RNC

Open Loop Power Control (Initial Access)

Closed Loop Power Control

Outer Loop Power Control


Packet Scheduler

time

packet service session

packet call

reading time

packet size packet arrival interval


Load Control

Overload

Load Target

Overload Margin

Pow

er

Estimated capacity for NRT traffic.

Measured load caused by non-controllable load


ATM in Brief (1/6)

Header (5 bytes)Payload (48 bytes)

ATM Cell

GFC VPI

VPI VCI

VCI

VCI PT CLP

HEC

Payload Data 48 Bytes

1 2 3 4 5 6 7 8Bit number:

Header(5Bytes)

GFC = Generic FlowC t lVPI = Virtual Path IdentifierVCI = Virtual ChannelId tifiPT = Payload TypeCLP = Cell Loss PriorityHEC = Header Error Control


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 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 CELLHEADER

ATM 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 different users


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)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)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 bytesP

O

H

9 bytes1 byte

VC-4

UMTS course - EPFL 21.12.04 Part 1-2ica · UMTS course Introduction UMTS principles Network...

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