WO BT04 E1 1 UMTS Interface Protocol-58

UMTS Interface Protocol

ZTE University

Content

Network Architecture

Iu Interface

Iur Interface

Iub Interface

Uu Interface

Service Data Processing Flow

CN

UTRAN

UE

UMTS System Structure

UTRANUMTS Terrestrial Radio Access Network

CNCore Network

UEUser Equipment

UMTS Network Architecture

Terminology of UMTS RNS Network

UTRAN: UMTS Terrestrial Radio Access Network

RNS: Radio Network Subsystem

RNC: Radio Network Controller

UE: User Equipment

Uu: Radio Interface

Iub: The interface between NodeB and RNC

Iur: The interface between RNCs

Iu_CS: between RNC and CS domain

Iu_PS:between RNC and PS domain

Iu_BC:for BroadCast domain

Universal model of the UTRAN interfaces

Application

Protocol

Data

Stream(s)

ALCAP(s)

Transport

Network

Layer

Physical Layer

Signalling

Bearer(s)

Transport Network

User Plane

Control Plane User Plane

Transport

User

Network

Plane

Transport Network

Control Plane

Radio

Network

Layer

Signalling

Bearer(s)

Data

Bearer(s)

Universal model of the UTRAN interfaces

Horizontal: UTRAN falls into 2 layers

Radio Network Layer (RNL)

Transport Network Layer (TNL)

Vertical: UTRAN falls into 4 planes

Control plane

User plane

TNL control plane

TNL 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

Service

TE/MT Local

Bear service

Physical Bear

Service

UTRA FDD/TDD

Service

Backbone

Services

Iu Interface

Bear ServicesRB Services

RAB ServiceCN Bear

Service

TECN

GatewayUTRANMT TE

CN Iu

EDGE

Node

UMTS

UMTS Bearing Services Structure

Content


Iu Interface

Iur Interface

Iub Interface

Uu Interface


Iu Interface

Node B

RNC

RNC

CS

Domain

PS

Domain

BC

Domain

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 Protocol

Layer

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


Plane

Physical Layer

ATM

AAL 5

UDP

IP

GTP-U

M3UA

Iu interface Functions

RAB management

RAB setup, modification and release

mapping of RAB characteristics to the Uu bearer

mapping of RAB characteristics to the Iu transmission bearer

RAB queuing, preemption and priority

Iu radio resource management

radio resource acceptance control

Iu connection management

Iu signaling connection management

Iu-UP (RNL) management

Iu-UP frame protocol mode selection and protocol initialization

Mobility management

Security management

Service and network access

Paging 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 RANAP

and 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 Message

RAB Release Request RAG RELEASE REQUEST

Iu Release Request IU RELEASE REQUEST

Relocation Detect RELOCATION DETECT

Relocation Complete RELOCATION COMPLETE

SRNS Data Forwarding Initiation SRNS DATA FORWARD COMMAND

SRNS Context Forwarding from Source RNC to CN FORWARD SRNS CONTEXT

SRNS Context Forwarding to Target RNC from CN FORWARD SRNS CONTEXT

Paging PAGING

Common ID COMMON ID

CN Invoke Trace CN INVOKE TRACE

CN Deactivate Trace CN DEACTIVATE TRACE

Location Reporting Control LOCATION REPORTING CONTROL

Location Report LOCATION REPORT

Initial UE Message INITIAL UE MESSAGE

Direct Transfer DIRECT TRANSFER

Overload Control OVERLOAD

Error 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 Name

SCCP Signaling connection control protocol

MTP3B 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 protocol

Q.2630.1 AAL2 signaling control protocol

Q.2150.1 AAL2 signaling transport converter at NNI

M3UA MTP3 user adaptation protocol

SCTP Stream control transmission protocol

GTP-U GPRS tunneling protocol user

Content


Iu Interface

Iur Interface

Iub Interface

Uu Interface


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 Layer


Plane

Transport Network

Control PlaneTransport Network User

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 transmission

used to transmit dedicated channel data between two RNCs.

Common channel data transmission

setup and release of the transmission connection needed in

common channel data stream transmission of the Iur interface,

Global resource management

transmission 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 Management

Physical Channel Reconfiguration

Radio Link Supervision

Compressed Mode Control

Measurements on Dedicated Resources

DL Power Drifting Correction

CCCH Signaling Transfer

Paging

Common Transport Channel Resources Management

Relocation Execution

Content


Iu Interface

Iur Interface

Iub Interface

Uu Interface


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 B

Application

Part (NBAP)

Radio

Network

Layer

Transport

Network Layer

Radio Network Control

Plane

Transport Network Control

PlaneUser Plane

Iub interface Functions

Management of the Iub interface transmission resources.

Logic operation maintenance of Node B, including:

the cell configuration management

radio network performance measurement

common transmission channel management

radio 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 style

System Information Management

Configuration Alignment

Measurements

Radio Link Management

Radio Link Supervision

Compressed Mode Control

DL Power Drifting Correction

Content


Iu Interface

Iur Interface

Iub Interface

Uu Interface


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 Protocol

provides 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 connections 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

RLC

Ctrl

MAC

Ctrl

L1

Ctrl

RRC SAPs

Access Plane

TME

RRC Mode (UTRAN Side)

GPRS

Packet

Transport

Mode

GSM

Connection

Mode

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

GPRS Packet Idle Mode

out of

service

in

service

out of

service

in

service

out of

service

in

service

Idle Mode

UTRA Connection Mode

CELL_FACHCELL_DCH

URA_PCH CELL_PCH

Release RRC

Connection

Establish RRC

Connection

Release RRC

Connection

Establish RRC

Connection

Cell

Reselection

Release of

temporary

block flow

Initiation of

temporary

block flow

Release RR

Connection

Establish RR

Connection

GSM:

Hand over

UTRA:

Inter-RAT

Hand over

RRC Status and Migration Diagram

PDCP Function

PDCP is only used in PS services

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.

Head

Compression

Algorithm

Type I

Head

Compression

Algorithm

Type 2

PDU

Counter

PDU

Counter

Head

Compression

Algorithm

Type I

Head

Compression

Algorithm

Type 2

Head

Compression

Algorithm

Type 1

PDCP

Entity

PDCP

Entity

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

users

The 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 CacheReceiving Cache

Reassembly

Transmitting

Tr-Entity

Receiving

Tr-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

HeadDeleting RLC

Head

Decryption

Transmitting

UM Entity Receiving

UM Entity

Function:

Segment and

Concatenation

Padding

Transmit User Data

Encryption

Sequence Number

Detection

RLC UM Mode

Radio

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

MAC-Some Transport Channel Principles


Transport Block

The basic switching unit between L1 and MAC layer

Transport Block Set

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

moment.

Transport Block Size

The bit number of a Transport Block.

Transport Block Set Size

The bit number of a Transport Block Set.


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 Format

Transport 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.


Transport 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 Combination

When 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 Set

Transport 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 Indicator

TFCI 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 Function

FEC encoding/decoding of transport channel

To 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

implementation

Error Detection of transport channel

Transport Channel multiplexing, Coding Combination Transport

Channel demultiplexing

Rate Matching

To map Coding Combination Transport Channel to physical channel

Physical channel modulation/Frequency Spreading and

Demodulation/Frequency De-spreading

Frequency and Timing (Chip, Bit, Slot, Frame) synchronization

Close loop power control

Physical channel power weight and combination

RF Processing

Content


Iu Interface

Iur Interface

Iub Interface

Uu Interface


Radio Network Control-Plane protocol

RNC

CN

Node B

UE RNC

RANAP

RNSAP

NBAP

RRC

NBAPNode 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

DCNtGCDCNtGC 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

Segment

And

Concatenation

Reassembly

Uu Interface Data Flow

The Physical Channel Forming Flow before

Frequency Spreading102040 or 80ms

data

data

data

TrCH-i

dataCRC dataCRC dataCRC

data CRC data CRC data CRCd a t aCBL CBL CBL

0816 or 24bits

Block Size Z512Ktail CC

5120Ktail Turbo

CedBL CedBL CedBLCoded data CC or TCRate matched data

Rate matched data DTXor

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-1TrCH-2 TrCH-I DTXCCTrCH

Ph-1 Ph-2 Ph-P

In 10ms

In 10msPh-1 Ph-2 Ph-P

TPC TFCI pilot

Frequency Spreading,

ScramblingFrequency Spreading,

Scrambling

Frequency Spreading,

Scrambling

TrCH-i+1

data1 data2 TPC TFCI pilotdata1 data2 TPC TFCI pilotdata1 data2

Documents

WO BT04 E1 1 UMTS Interface Protocol-58