119301911-WCDMA

UMTS Interface Protocol

ZTE University

Content

Network ArchitectureIu InterfaceIur InterfaceIub InterfaceUu InterfaceService Data Processing Flow

CN

UTRAN

UE

UMTS System Structure

UTRAN：UMTS Terrestrial Radio Access NetworkCN：Core NetworkUE：User Equipment

UMTS Network Architecture

Terminology of UMTS RNS Network

UTRAN: UMTS Terrestrial Radio Access NetworkRNS: Radio Network SubsystemRNC: Radio Network ControllerUE: User EquipmentUu: Radio InterfaceIub: The interface between NodeB and RNCIur: The interface between RNCsIu_CS: between RNC and CS domainIu_PS:between RNC and PS domainIu_BC:for BroadCast domain

Universal model of the UTRAN interfaces

ApplicationProtocol

DataStream(s)

ALCAP(s)

TransportNetwork

Layer

Physical Layer

SignallingBearer(s)

Transport Network

User Plane

Control Plane User Plane

Transport

User

Network

Plane

Transport NetworkControl Plane

RadioNetworkLayer

SignallingBearer(s)

DataBearer(s)

Universal model of the UTRAN interfaces

Horizontal: UTRAN falls into 2 layersRadio Network Layer (RNL)Transport Network Layer (TNL)

Vertical: UTRAN falls into 4 planesControl planeUser planeTNL control planeTNL user plane

In R99 and R4, the ATM technology is adopted at the transport network layer, while R5, IP transmission is introduced.

End-to-End Service

UMTS Bear ServiceExternal Bear

ServiceTE/MT Local Bear service

Physical Bear Service

UTRA FDD/TDD Service

Backbone Services

Iu Interface Bear Services

RB Services

RAB ServiceCN Bear Service

TE CNGateway

UTRANMT TECN IuEDGENode

UMTS

UMTS Bearing Services Structure

Content


Iu Interface

Node B

RNC

RNC

CSDomain

PSDomain

BCDomain

Node B

Node B

Node B

UTRAN Core Network (CN)

“Iu-CS”

“Iu-PS”

“Iu-BC”

Iu Interface

Iu-CS Interface Stack Structure

Physical Layer

ATM

AAL 5 AAL 5

SSCF-NNI

SSCOP

Q.2150.1

AAL 2

Q.2630.1

RANAP

Radio Network Layer

transport Network Layer

Control Plane

transport Network Control Plane

User Plane

Iu UP ProtocolLayer

MTP3b

SCCP

SSCF-NNI

SSCOP

MTP3b

transport Network User Plane

transport Network User Plane

Iu-PS Interface Stack Structure

Physical Layer

ATM

AAL 5

SSCF-UNI

SSCOP

RNSAP

Radio Network Layer

Transport Network Layer

Control Plane

Transport Network Control Plane

User Plane

Iu UP Protocol

Layer

MTP3-B

SCTP

IP

SCCP

Transport Network User Plane


Physical Layer

ATM

AAL 5

UDP

IP

GTP-U

M3UA

Iu interface Functions

RAB managementRAB setup, modification and releasemapping of RAB characteristics to the Uu bearermapping of RAB characteristics to the Iu transmission bearerRAB queuing, preemption and priority

Iu radio resource managementradio resource acceptance control

Iu connection managementIu signaling connection management

Iu-UP (RNL) managementIu-UP frame protocol mode selection and protocol initialization

Mobility managementSecurity managementService and network accessPaging coordination

Stream Control Transmission Protocol(SCTP)

SCTP is a reliable datagram transfer protocol based on an unreliable transfer protocol such as UDP. SCTP End Point is a logical entity, logical datagram sender and receiver. Each SCTP End Point is only identified by IP address and port number, similar to TCP. SCTP Association is a logical association or channel established between two SCTP End Points. Client/Server mode is adopted.

MTP3-User Adaptation Layer Protocol(M3UA)

M3UA (MTP3-User Adaptation Layer) protocol conducts conversion between SPCs and IP addresses. It is used for the SS7 signaling to transfer between the Softswitch and the Signaling Gateway(SG). It supports to transfer the MTP3 user messages over the IP network, including ISUP, TUP, and SCCP messages.

Signaling connection control protocol SCCP

In ZXWR RNC, SCCP protocol is mainly used to transport signaling message by Iu/Iur interface. The client is RANAPand RNSAP.It offers the connectionless or connection-oriented services for its client. The SCCP also offers the segmentation and reassembly functions.

Basic Processing Initial Message Response Message for Success

Response Message for Failure

Iu Release IU RELEASE COMMAND

IU RELEASE COMPLETE

Relocation Preparation

RELOCATION REQUIRED

RELOCATION COMMAND

RELOCATION PREPARATION FAILURE

Relocation Resource Allocation

RELOCATION REQUEST

RELOCATION REQUEST ACKNOWLEDGE

RELOCATON FAILURE

Relocation Cancel RELOCATION CANCEL

RELOCATION CANCEL ACKNOWLEDGE

SRNS Context Transfer

SRNS CONTEXT REQUEST

SRNS CONTEXT RESPONSE

Security Mode Control

SECURITY MODE COMMAND

SECURITY MODE COMPLETE

SECURITY MODE REJECT

Data Volume Report DATA VOLUME REPORT REQUEST

DATA VOLUME REPORT

Reset RESET RESET ACKNOWLEDGE

Reset Resource RESET RESOURCE RESET RESOURCE ACKNOWLEDGE

Iu Flow Overview

Basic Processing MessageRAB Release Request RAG RELEASE REQUESTIu Release Request IU RELEASE REQUESTRelocation Detect RELOCATION DETECTRelocation Complete RELOCATION COMPLETESRNS Data Forwarding Initiation SRNS DATA FORWARD COMMANDSRNS Context Forwarding from Source RNC to CN FORWARD SRNS CONTEXTSRNS Context Forwarding to Target RNC from CN FORWARD SRNS CONTEXTPaging PAGINGCommon ID COMMON IDCN Invoke Trace CN INVOKE TRACECN Deactivate Trace CN DEACTIVATE TRACELocation Reporting Control LOCATION REPORTING CONTROLLocation Report LOCATION REPORTInitial UE Message INITIAL UE MESSAGEDirect Transfer DIRECT TRANSFEROverload Control OVERLOADError Indiction ERROR INDICATION

Iu Flow Overview

Basic Processing Initial Message Response Message

RAB Assignment RAB ASSIGNMENT REQUEST

RAB ASSIGNMENT RESPONSE x N (N>=1)

Iu Flow Overview

Appendix

Abbreviation Full NameSCCP Signaling connection control protocolMTP3B Broadband message transfer protocol

SSCF-NNI Service specific coordination function for support of signaling at the network node interface

SSCF-UNI Service specific coordination function for support of signaling at the user network interface

SSCOP Service specific connection oriented protocolQ.2630.1 AAL2 signaling control protocolQ.2150.1 AAL2 signaling transport converter at NNI

M3UA MTP3 user adaptation protocolSCTP Stream control transmission protocolGTP-U GPRS tunneling protocol – user

Content


Iur Interface Stack Structure

Physical Layer

ATM

AAL 5 AAL 5

SSCF-UNI

SSCOP

STC(Q.2150.1)

AAL Type 2

ALCAP(Q.2630.1)

RNSAP

Control Plane User Plane

Iur Data Flow

MTP3-B

SCTP

IP

M3UA

SCCP

SSCF-UNI

SSCOP

MTP3-B

SCTP

IP

M3UA

Radio Network Layer



Transport Network Control Plane


Iur interface Functions

Iur interface has the following functions:Inter-RNC mobility management

SRNC relocation, inter-RNC cell and UTRAN registration area update, inter-RNC paging, and protocol error report.

Dedicated channel data transmissionused to transmit dedicated channel data between two RNCs.

Common channel data transmissionsetup and release of the transmission connection needed in common channel data stream transmission of the Iur interface,

Global resource managementtransmission of inter-RNC cell measurement information.transmission of inter-RNC Node B timing information.

SRNS

DCH

DATA

PORT

DCH

DATA

PORT

DSCH

DATA

PORT

DSCH

DATA

PORT

USCH

DATA

PORT

USCH

DATA

PORT

RACH/

CPCH/FACH

DATA

PORT

RACH/

CPCH/FACH

DATA

PORT

Iur

Control

PORT

RACH/FACH Services Context

with Various FeaturesDRNS

RL RL RL RL RL RL

…… …… …… ……

Cell Cell

Radio User Plane

Iur Control Plane

Iur Logical Mode

Iur Flow Overview

Radio Link ManagementPhysical Channel ReconfigurationRadio Link SupervisionCompressed Mode ControlMeasurements on Dedicated ResourcesDL Power Drifting CorrectionCCCH Signaling TransferPagingCommon Transport Channel Resources ManagementRelocation Execution……

Content


Iub Interface Stack Structure

Physical Layer

ATM

AAL Type 5 AAL Type 5

SSCF-UNI

SSCOP

Q.2150.1

SSCF-UNI

SSCOP

AAL Type 2

Q.2630.1

ALCAP

Node BApplication Part (NBAP)

Radio Network Layer


Radio Network Control Plane

Transport Network Control Plane User Plane

Iub interface Functions

Management of the Iub interface transmission resources.Logic operation maintenance of Node B, including:

the cell configuration managementradio network performance measurementcommon transmission channel managementradio resource management

Transmission of application-related operation & maintenance data.System information management.Channel traffic management.Timing and synchronization management, including:

node synchronization transmission channel synchronization between the RNC and Node B

Control RNC

Node B Communication Environment

RACH

DATA

PORT

CPCH

DATA

PORT

FACH

DATA

PORT

PCH

DATA

PORT

DSCH

DATA

PORT

USCH

DATA

PORT

DCH

DATA

PORT

DSCH

DATA

PORT

USCH

DATA

PORT

DCH

DATA

PORT

Communi-

cation

Control

Port

Communi-cation

Control

Port

Node B

Control

PORT

Common Transport Channel Node B

Service Terminal Point Service Terminal Point

Cell Cell Cell Cell Cell Cell

Iub Interface Logical Mode

Iub Flow Overview

Click to edit master text styleSystem Information ManagementConfiguration AlignmentMeasurementsRadio Link ManagementRadio Link SupervisionCompressed Mode ControlDL Power Drifting Correction……

Content


RRC

MAC

Physical Layer

BMC

RLCRLCRLCRLC

RLCRLCRLCRLC

PDCPPDCP

Transport Channel

Logical Channel

RB

Control

ControlControl

Control

Control

Control Plane signaling User Plane Message Uu Interface Edge

L1

L2/MAC

L2/RLC

L2/BMC

L2/PDCP

L3

Uu Interface Stack Structure

Uu Interface Stack Structure(1)

Physical Layer Protocolprovides the MAC sublayer with transmission channel services.

MAC Protocol (Media Access Control)provides the RLC sublayer with logic channel services.

RLC Protocol (Radio Link Control)on the control plane, provides the RRC sublayer with signaling radio bearer services. on the user plane, provides service radio bearer services together with the PDCP sublayer.

PDCP (Packet data convergence protocol)adapt different types of network layer protocols to the radio interface.only exists in the packet domain

BMC (Broadcast main control)transfer broadcast and multicast information over the radio interface.

Uu Interface Stack Structure(2)

RRC (Radio resource control)Provide services for the non-access layer, for example, transmitting messages like call control, session management and mobility management at the control interface.Setup, maintenance and release of an RRC connection between UE and UTRAN.Setup, reconfiguration and release of radio bearer.Distribution, reconfiguration and release of radio resources used in the RRC connection.RRC connection’s mobility function management.Request for QoS control.UE measurement report and report control.Outer loop power control, ciphering control, paging.Initial cell selection and reselection in the idle mode.

RLC

MAC

Physical Layer

BCFE PNFE DCFE SCFE

RFERFERFE

RRC

Tr SAP UM SAP AM SAP

RLCCtrl

MACCtrl

L1Ctrl

RRC SAPs

Access Plane

TME

RRC Mode (UTRAN Side)

GPRS Packet

TransportMode

GSM Connection

Mode

Camping on a UTRAN cell Camping on a GSM/GPRS cell

GPRS Packet Idle Mode

out ofservice

inservice

out ofservice

inservice

out ofservice

inservice

Idle Mode

UTRA Connection Mode

CELL_FACHCELL_DCH

URA_PCH CELL_PCH

Release RRCConnection

Establish RRCConnection

Release RRCConnection

Establish RRCConnection

CellReselection

Release of temporaryblock flow

Initiation of temporaryblock flow

Release RRConnection

Establish RRConnection

GSM:Hand over

UTRA:Inter-RATHand over

RRC Status and Migration Diagram

PDCP Function

User Data Transport: Transmit NAS data to RLC layer or reverse.IP Head Compression: Compress or decompress the IP data in the Transport entities and receive entities. Different network layer has different compression algorithm.Sequence Number Maintenance: If RB supports lossless SRNS Reselection, the Sequence Number can be kept synchronized between UE and RNC.

PDCP is only used in PS services

Head Compression Algorithm Type I

Head Compression Algorithm Type 2

PDU

Counter

PDU

Counter

Head Compression Algorithm Type I



PDCPEntity

PDCPEntity

C-SAP

…

…

PDCP-SAPs

UM-SAP AM-SAP Tr-SAP

PDCP-SDU

RLC-SDURLC-SAPs

PDCP Sub-layer Structure

BMC Services and Function

BMC services adopt TM or UM to provide Broadcast/Multicast services for the public usersThe functions of BMC include cell broadcast message depository, service flow monitor, radio resource request for cell broadcast, BMC message scheduling, sending and receiving cell broadcast message and so on.

BMC Entity

BMC

Control

BMC SAP

RLC UM-SAP

BMC Sub-layer Structure

RLC Layer Work Modes

RLC provides the services for the upper layer: RLC connection setup/release, TM data Transport, UM data Transport, AM data Transport, unrecoverable error notify and so on.The functions for RLC include Segment, Reassemble, Concatenation, Padding added, Data Transport, Error Detect, PDU delivery in order, Detection Repeat, Flow Control, Sequence Number Detection, Protocol Error Detection/ Retrieval/ Encryption/ Suspend function.RLC work modes: TM, UM,AM. Different work mode is adopted according to the QoS requirement of different services; for the signaling, the work mode also depends on the significance.

Radio Interfaces

BCCH/PCCH/DCCH/

CCCH/DTCH/SHCCH

BCCH/PCCH/DCCH/

CCCH/DTCH/SHCCH

Tr-SAP Tr-SAP

Segment

Transmitting Cache Receiving Cache

Reassembly

TransmittingTr-Entity

ReceivingTr-Entity

Function:

Segment and reassemble User Data

RLC TM Mode

CCCH/DCCH/

DTCH/SHCCH

UM-SAP UM-SAP

Transmitting Cache Receiving Cache

Reassembly

CCCH/DCCH/

DTCH/SHCCH

Segment & Concatenation

Encryption

Adding RLC Head

Deleting RLC Head

Decryption

TransmittingUM Entity

Receiving UM Entity

Function:Segment and Concatenation

Padding

Transmit User Data

Encryption

Sequence Number Detection

RLC UM ModeRadio

Interfaces

Segment & Concatenation

Adding RLC Head

Retransmission Cache&Management

Multiplexing

Transport Cache

Configuring PDU Head

Encryption

RLC Control Unit

Demultiplexing/Routing

Decryption

Reassembly

Deleting RLC head/Extract Piggybacked Information

Receiving Cache/Retransmission Management

AM RLC Entity

Receiving SideTransmitting Side

Function:

Segment/Reassembly

Concatenation

Padding

Transmitting User Data

Error Control

Delivery in order

Detection Repeat

Protocol Error Detection/ Retrieval/ Encryption

RLC AM Mode

MAC-Transport Channel Categories

BCH, Broadcast ChannelFACH, Forward Access ChannelPCH, Paging ChannelRACH, Random Access ChannelCPCH, Common Packet ChannelDSCH, DL Share Channel

DCH, Dedicated Channel

Common Transport Channel

Dedicated Transport Channel

Transport Block Transport Block Transport Block



Transport Block

Transport Block

Transport Block

Transport Block

Transport Block

Transport Block

Transport Block Transport Block

Transport Block

Transport Time Interval

Transport Time Interval

Transport

Time Interval

MAC-Some Transport Channel Principles

MAC-Some Transport Channel PrinciplesTransport Block

The basic switching unit between L1 and MAC layerTransport Block Set

A Set of Transport Blocks which are Transmitted in a Transport channel on a certain moment.

Transport Block SizeThe bit number of a Transport Block.

Transport Block Set SizeThe bit number of a Transport Block Set.

Transport Time Interval Transport Time Interval is defined as a time interval for a Transport Block arrived, and it equals to the time for transporting a Transport Block on the Physical Layer of Radio Interface. It is always the gemination of MIN. interleaving cycle (10ms, Size of Radio Frame). MAC layer transports a Transport Block Set to the physical layer in each TTI.

Transport FormatTransport Format is defined as the format of a Transport Block Set which is transported on a Transport channel. The format is provided for MAC layer by L1 (or MAC layer provides for L1). The Transport Format is consisted of two parts: dynamical part and static part.

MAC-Some Transport Channel PrinciplesTransport Format Set

Transport Format Set is defined as a set of Transport Format on a Transport Channel. In side of a Transport Format Set the static part of transport format is the same. The previous two features of the dynamic part determine the instantaneous bit rate of the Transport channel.

Transport Format CombinationWhen one or more transport channels map in L1, for each transport channel, there should be a sets of Transport Format (Transport Format Set) available. For a certain time, not all the Format Combination is appropriate for L1, but only a sub-set, which is Transport Format Combination.

Transport Format Combination SetTransport Format Combination Set is defined as a set of Transport Format Combination of Coded Composite Transport Channel (CCTrCH) .

Transport Format Indicator TFI is the specific indicator for a certain Transport Format among the Transport Format Set. It is used between L1 and MAC layer, when they exchange a transport block set.

Transport Format Combination IndicatorTFCI is a indicator of the current Transport Format Combination.

The Services Provided by L1 and Timing Operation

The Physical Layer provides Data Transport Services for the upper layer, which are implemented by MAC sub-layer through Transport Channel.

Transport Format (or Transport Format Set) defines the feature of the transport channel, meanwhile, it also indicates the processing on the transport channel by physical layer, such as convolutional encoding and interleaving, rate match required by the services and so on.

The operation on the physical layer is strictly according to the timing of L1 Radio frame. And for every 10ms (or multiple times of 10ms) to generate a transport block.

Physical Layer FunctionFEC encoding/decoding of transport channelTo provide measurement and indicator for the upper layer (such as FER, SIR, Interference Power, Transport Power and so on)Macro Diversity distribution/ Combination and soft handover implementationError Detection of transport channelTransport Channel multiplexing, Coding Combination Transport Channel demultiplexingRate MatchingTo map Coding Combination Transport Channel to physical channelPhysical channel modulation/Frequency Spreading and Demodulation/Frequency De-spreadingFrequency and Timing (Chip, Bit, Slot, Frame) synchronizationClose loop power controlPhysical channel power weight and combinationRF Processing

Content


Radio Network Control-Plane protocol

RNC

CN

Node B

UE RNC

RANAPRNSAP

NBAP

RRC

NBAP：Node B Application Part

RANAP: Radio Access Network Application Part

RNSAP: Radio Network Subsystem Application Part

RRC: Radio Resource Control

UTRAN Control Plane Protocol Stack

NBAP

L1 L1

MAC

RLC

RRC

MM/GMM

CC SM

NBAP

Transport Layer

Transport

Layer

Transport

LayerMAC

RLC

RRC RANAP RANAP

MM/GMM

CC SM

Uu

UE Node B RNC CN

Iub Iu

…Transport

Layer

UTRAN User Plane Protocol Stack

L1

MAC

RLC

PDCP

Transport

Layer

Transport

Layer

Iu UP

Uu

UE Node B RNC CN

Iub Iu

L1 FP FP

Transport Layer

MAC

RLC

PDCP

Iu UPUser Data

Transport Layer

AS and NAS

DCNtGC

UTRANUE Core Network

Access Stratum (AS)

Non-Access Stratum (NAS)

Radio(Uu) Iu

DCNtGC

DCNtGC DCNtGC DCNtGC DCNtGC

end AS entity end AS entity

Relay

UuStratum(UuS)

IuStratum

L2/L1

RRC

L2/L1

RRC

High Layer PDU

RLC SDU

High Layer PDU

RLC

Header

RLC

Header

MAC SDU MAC SDUMAC

Header

MAC

Header

Transport Block Transport Block

CRC CRC

RLC SDU

……

……

……

……

……

High Layer

L2 RLC(Non-Transparent Mode)

L2 MAC(Non-Transparent Mode)

L1

SegmentAnd Concatenation

Reassembly

Uu Interface Data Flow

The Physical Channel Forming Flow before Frequency Spreading

10、20、40 or 80ms

data

data

data

TrCH-i

data CRC data CRC data CRC

data CRC data CRC data CRCd a t aCBL CBL CBL

0、8、16 or 24bits

Block Size Z＝512－Ktail ， CC

5120－Ktail ，Turbo码

CedBL CedBL CedBLCoded data CC or TCRate matched data

Rate matched data DTX

or

or

Data before 1st interleavingData after 1st interleaved

line of interleaver:1,2,4 or 8

Radio Frame

Radio Frame

Radio Frame

Number of Radio Frame:1,2,4 or 8

TrCH-1 TrCH-2 TrCH-ICCTrCHTrCH-1 TrCH-2 TrCH-I DTXCCTrCH

Ph-1 Ph-2 Ph-P

In 10ms

In 10msPh-1 Ph-2 Ph-P

TPC TFCI pilot

Frequency Spreading, Scrambling



TrCH-i+1

data1 data2 TPC TFCI pilotdata1 data2 TPC TFCI pilotdata1 data2

Documents

119301911-WCDMA