UMTS Signalling

UMTS Universal Mobile Telecommunications System Signalling Sig nalling

Signa Sig nalli lling ng proto protoco coll de detai tails ls

Chap Ch apte terr co cont nten ents ts »

UMTS Protocol Interne Internetworkin tworking g Archite Architecture cture

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Part 1:

Transport Network Protocols, CS and PS

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Part 2:

Radio Network Protocols, CS and PS

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Part 3:

System Network Protocols, CS and PS

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Exampl Exa mples es of UMTS UMTS proc procedur edures es

Chap Ch apte terr co cont nten ents ts »

UMTS Protocol Interne Internetworkin tworking g Archite Architecture cture

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Part 1:

Transport Network Protocols, CS and PS

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Part 2:

Radio Network Protocols, CS and PS

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Part 3:

System Network Protocols, CS and PS

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Exampl Exa mples es of UMTS UMTS proc procedur edures es

UMTS Network Protocol Architecture

Uu

NodeB

Iub

RNC

Iu

MSC VLR

User Plane Control Plane

System Network Layer User Plane Control Plane

Radio Network Layer User Plane Control Plane

Transport Network Layer

SGSN

E / Gn

GMSC

GGSN

UMTS Network Transactions

Uu / Iub Iub – Co Cont ntro roll-Pl Plan ane e

MM / SM / CC

MM/SM/CC

RRC

RRC

AAL2L3

RLC

RLC

STC

MAC

MAC

SSCF SS CF-- UN UNII

UP FP

SSCOP

AAL2

AAL5

WCDMA

NodeB

ATM

NBAP

RNC

Uu / Iub – User-Plane

Application data

Application data

PDCP

PDCP

BMC

BMC

RLC

RLC

MAC

MAC UP FP AAL2

WCDMA

NodeB

ATM

RNC

Iur – User- / Control-Plane Control-Plane

User-Plane

MM/SM/CC RRC

Application data AAL2L3

RNSAP

STC

SCCP

BMC

RLC

MTP3-B

M3UA

RLC

MAC

SSCF-NNI

SCTP

MAC

UP FP

SSCOP

IP

UP FP

AAL5

AAL2 RNC

PDCP

ATM

AAL2 RNC

ATM

RNC

IuCS – User- / Control-Plane Control-Plane

User-Plane Application data

MM/SM/CC RANAP

AAL2L3

TAF

SCCP

STC

RLP

MTP3-B

M3UA

SSCF-NNI

SCTP

SSCOP

IP

Iu UP

AAL5 RNC

ATM

AMR

AAL2 MSC

ATM

RNC

IuPS – User- / Control-Plane Control-Plane

User-Plane

MM / CC / SS

Application data

RANAP

IP

SCCP MTP3-B

M3UA

SSCF-NNI

SCTP

SSCOP

IP

GTP-U UDP IP

AAL5 RNC

ATM

AAL5 SGSN

ATM

RNC

E – User- / Control-Plane Control-Plane

User-Plane

MAP

Application data ISUP

TCAP

SCCP MTP-L3 MTP-L2 MSC VLR

PCM

MSC VLR

PCM

MSC VLR

Gn – User- / Control-Plane Control-Plane

User-Plane Application data IP

GTP-C

GTP-U

UDP

UDP

IP

IP

AAL5 SGSN

ATM

AAL5 Ethernet

GGSN

ATM

Ethernet

SGSN

Signalling Part 2

Radio Network Layer ASN.1 RRC, NBAP, RNSAP and RANAP AAL2L3 (ALCAP) Iu UP, AMR, TAF, RLP PDCP and BMC

RRC »

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Radio Resource Control Routing of higher layer messages to different MM/CM entities (UE side) or different core network domains

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Creation and management of Radio Bearers

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Broadcasting of System Information

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Paging of UEs

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Dedicated Control handles all functions specific to one UE » »

Location Management Handover

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Power Management (outer loop power control)

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Configuration of lower layer protocols

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Management of measurement reports

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Specified in 3GPP 25.331

RRC States Idle Mode Camping on a UTRAN cell Establish Dedicated RRC- Connection Release Dedicated RRC- Connection

CELL_DCH

GPRS idle mode

Camping on a GSM cell

Establish Cell Shared reselection RRC- Init Rel. Connection of of Release TBF TBF Shared RRC- Connection GPRS

CELL_FACH

CELL_PCH

UTRAN Connected Mode

Release RR- Connection

Packet Transfer Mode

GSM: Handover

URA_PCH

Establish RR- Connection

UTRAN: Inter-RAT Handover

GSM Connected Mode

RRC – UMTS Connected Mode States UTRAN Connected Mode

CELL_DCH

RRC State Indicator: URA_PCH

URA_PCH

Release last dedicated channel Allocation of dedicated channel

C H P A_ r R U s f e : r t o t r a n a i c L n d i t U . I e n t I t a o r S C i n g R R a g P

CELL_FACH

RRC State Indicator: CELL_PCH Paging or Init. UL transfer

CELL_PCH

RRC Connection Establishment „ ... a point-to-point bi-directional connection between RRC peer entities in the UE and the UTRAN characterised by the allocation of a U-RNTI. A UE has either zero or one RRC connection.“ RNC

Idle ( RLC-SAP: TM, CCCH ) RRC CONNECTION REQUEST

[ RRC TAId, Initial UE Id, Establishment Cause ] ( RLC-SAP: UM, CCCH ) RRC CONNECTION SETUP

[ RRC TAId, new U-RNTI, SRB ] ( RLC-SAP: AM, DCCH ) RRC CONNECTION SETUP COMPLETE

Connected Successful Unsuccessful

[ RRC TAId, UE Radio Acces Capability ]

( RLC-SAP: TM, CCCH ) RRC CONNECTION REQUEST

[ RRC TAId, Initial UE Id, Establishment Cause ] ( RLC-SAP: UM, CCCH ) RRC CONNECTION REJECT

[ RRC TAId, Cause ]

RRC Connection Release RNC

( RLC-SAP: UM, DCCH ) RRC CONNECTION RELEASE

[ RRC TAId, Release Cause ] ( RLC-SAP: UM / AM, DCCH ) RRC CONNECTION RELEASE COMPLETE

[ RRC TAId ]

( RLC-SAP: UM, CCCH ) RRC CONNECTION RELEASE

[ U-RNTI, RRC TAId, Release Cause ]

RRC Signalling Connection RNC

( RLC-SAP: AM, DCCH ) INITIAL DIRECT TRANSFER

[ CN Domain Id, NAS SDU ] ( RLC-SAP: AM, DCCH ) DOWNLINK DIRECT TRANSFER

[ RRC TAId, CN Domain Id, NAS SDU ] ( RLC-SAP: AM, DCCH ) UPLINK DIRECT TRANSFER

[ CN Domain Id, NAS SDU ]

( RLC-SAP: AM, DCCH ) SIGNALLING CONNECTION RELEASE

[ RRC TAId, CN Domain Id ]

RRC Radio Bearer Setup RNC

( RLC-SAP: AM, DCCH ) RADIO BEARER SETUP *

[ RRC TAId, SRB and RB Info / List etc. ] ( RLC-SAP: AM, DCCH ) RADIO BEARER SETUP * COMPLETE

[ RRC TAId ]

( RLC-SAP: AM, DCCH ) RADIO BEARER SETUP *

[ RRC TAId, SRB and RB Info / List etc. ]

( RLC-SAP: AM, DCCH ) RADIO BEARER SETUP * FAILURE

[ RRC TAId , Failure Cause ]

NBAP »

Node B Application Part

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Cell Configuration Management

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Common Transport Channel Configuration

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System Information Management

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Resource Event Management

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Measurements on common and dedicated resources

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Radio Link Management of dedicated resources

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Radio Link Supervision

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NBAP Elementary Procedure »

Two classes of elementary procedures: »

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Class 1: Elementary procedure with response, success or failure Class 2: Elementary procedure without response

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NBAP Initiating Message is transporting the procedure request

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For Class 1 elementary procedure the response is transmitted » »

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Success: Successful Outcome Message Failure: Unsuccessful Outcome Message

The elementary procedure is identified by the parameter Procedure Identification Code. The CRNC Communication Context contains all info for the CRNC to communicate with a specific UE. The Context is identified by the parameter CRNC Communication Context Identifier .

NBAP Example Procedure NodeB

RNC

INITIATING MESSAGE [ Procedure Code: RADIO LINK SETUP , Transaction-Id, C-Id, Channel parameter ]

Successful Unsuccessful

SUCCESSFUL OUTCOME [ Procedure Code: RADIO LINK SETUP, Transaction-Id, Channel parameter ]

INITIATING MESSAGE [ Procedure Code: RADIO LINK SETUP , Transaction-Id, C-Id, Channel parameter ] UNSUCCESSFUL OUTCOME [ Procedure Code: RADIO LINK SETUP, Transaction-Id, Cause ]

RANAP »

Radio Access Network Application Part

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Transfer of NAS-PDU between CN and UTRAN

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Overall RAB management

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Relocating of SRNC

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Controlling the security mode of UTRAN

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Paging the UE

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Release of RAB and the Iu connection resources

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SCCP uses SSN=142 for RANAP identification

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RANAP Elementary Procedure »

Three classes of elementary procedures: »

» »

Class 1: Elementary procedure with response ( success and / or failure ) Class 2: Elementary procedure without response Class 3: Elementary procedure with possibility of multiple responses ( success and/or failure )

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RANAP Initiating Message is transporting the procedure request

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For Class 1 elementary procedure the response is transmitted » »

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Success: Successful Outcome Message Failure: Unsuccessful Outcome Message

For Class 3 elementary procedure the response is transmitted as Outcome Message

RANAP Example Procedure MSC

RNC

Class 2

Class 1

INITIATING MESSAGE [ Procedure Code: INITIAL UE MESSAGE, CN Domain Id, LAI, SAI, Iu Signal.Conn.Id, NAS PDU ] INITIATING MESSAGE [ Procedure Code: SECURITY MODE CONTROL, Integrity protection info, key status ] SUCCESSFUL OUTCOME [ Procedure Code: SECURITY MODE CONTROL, Integrity protection algorithm ]

Class 3

INITIATING MESSAGE [ Procedure Code: RAB ASSIGNMENT, RAB Id and Info, Cause ] OUTCOME [ Procedure Code: RAB ASSIGNMENT, Success or failure IEs for RAB Id and Info ]

Signalling Part 3

System Network Layer Circuit Switched: Mobility Management and Call Control control plane between CN nodes

Packet Switched: Mobility and Session Management control plane between CN nodes

Location Based Services

CS Mobility Management »

Procedures well known from GSM

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MM procedures to establish and release connections.

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Transfer of Call Management (CM) sublayer messages.

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MM common procedures for security functions, e.g. Authentication procedure. MM specific procedures for location functions like Periodic location updating or IMSI attach procedure.

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UE identified by IMSI or TMSI.

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CS Call Control »

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Procedures well known from GSM CC establishes and releases CC connections between UE and CN. Activation of voice/multimedia codec. »

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Interworking with RANAP for establishment of a RAB. »

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Based on 3G-324M, variant of H.324. See 3GPP 26.111. CC SETUP QoS will be mapped onto RANAP RAB assignment.


CS MOC Example MSC VLR

MM : CM Service Request [ Mobile Identity, MS Classmark ] MM : CM Service Accept CC : Setup [ Called Party Number, Bearer Capability ] CC : Call Proceeding

Call set-up Call release

MM : Authentication Request MM : Authentication Response CC : Alert CC : Connect CC : Connect Ack. CC : Disconnect [ Cause ] CC : Relase CC : Reease Complete

PS Mobility Management »

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Procedures well known from GPRS (GMM) GMM protocol makes use of a signalling connection between UE and SGSN. GMM establishes and releases GMM contexts, e.g. GPRS Attach. GMM specific procedures for location functions like Periodic routing area updating. New message implemented to provide service to CM sublayer on top of GMM: » »

SERVICE REQUEST message Initiated by UE, used to establish a secure connection to the network and to request the bearer establishment for sending data.

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UE identified by IMSI or P-TMSI

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PS Session Management »

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Procedures well known from GPRS (SM) Counterpart to CS CC protocol, i.e. it is used to establish and release packet data sessions. SM procedures to setup and release one or more PDP contexts.

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PDP Contexts are handled in UE and GGSN.

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SGSN represents interworking function.

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PS Activate PDP Context Example SGSN

GMM : Service Request [ Mobile Identity, MS Classmark ] GMM : Service Accept SM : Activate PDP Context Request [ APN, Type of PDP-Address, QoS ]

Connection set-up Connection release

SM : Activate PDP Context Accept [ PDP-Address, QoS ] SM : Deactivate PDP Context Request SM : Deactivate PDP Context Accept

Iu Procedures •

Location Update on IuCS

•

MOC on IuCS

•

MTC on IuCS

•

Attach on IuPS

•

PDP Context on IuPS

Location Update on IuCS 1/2 * : Initiating Message NodeB

RNC

MSC

RRC Connection Request NBAP: Radio Link Setup AAL2L3: Establish

RRC Connection Setup Initial Direct Transfer [ NAS: LUREQ ]

CR – RANAP: * Initial UE Message [ MM: LUREQ ] CC

DL Direct Transfer [ NAS : AUTREQ ] UL Direct Transfer [ NAS : AUTRESP ]

DT1 – RANAP: * Direct Transfer [ MM: AUTREQ ]

DT1 – RANAP: * Direct Transfer [ MM: AUTRESP ] DT1 – RANAP: * Common ID

Location Update on IuCS 2/2 * : Initiating Message NodeB

RNC

Security Mode Command Security Mode Complete

DL Direct Transfer [ NAS : LUACC ] RRC Connection Release

MSC

DT1 – RANAP: InitiatingMsg [ Security Mode Control ]

DT1 – RANAP: SuccOutcome [ Security Mode Control ] DT1 – RANAP: * Direct Transfer [ MM: LUACC ] DT1 – RANAP: InitiatingMsg [ Iu Release ]

NBAP: Radio Link Deletion AAL2L3: Release

DT1 – RANAP: SuccOutcome [ Iu Release ] RLSD RLC

MOC on IuCS 1/4 * : Initiating Message NodeB

RNC

Initial Direct Transfer [ NAS: CMSREQ ]

MSC

CR – RANAP: * Initial UE Message [ MM: CMSREQ ] CC




Security Mode Command Security Mode Complete UL Direct Transfer [ NAS : SETUP ]

DT1 – RANAP: InitiatingMsg [ Security Mode Control ] DT1 – RANAP: SuccOutcome [ Security Mode Control ] DT1 – RANAP: * Direct Transfer [CC : SETUP ]


RNC

DL Direct Transfer [ NAS : CPROC ]

MSC

DT1 – RANAP: * Direct Transfer [ MM: CPROC ] DT1 – RANAP: InitiatingMsg [ RAB Assignment ]

NBAP: Synchronised Radio Link Reconfiguration Preparation AAL2L3: Establish Request

AAL2L3: Establish Request

AAL2L3: Establish Confirm

AAL2L3: Establish Confirm Iu UP: ProcCode [ Initialisation ] Iu UP: Ack

Radio Bearer Setup DT1 – RANAP: Outcome [ RAB Assignment ]


RNC

DL Direct Transfer [ NAS : ALERT ] DL Direct Transfer [ NAS : CONNECT ] DL Direct Transfer [ NAS : CONN ACK ]

MSC

DT1 – RANAP: * Direct Transfer [CC : ALERT ] DT1 – RANAP: * Direct Transfer [CC : CONNECT ] DT1 – RANAP: * Direct Transfer [CC : CONN ACK ]

Iu UP: Type 0 [ AMR data ] Iu UP: Type 0 [ AMR data ] Iu UP: Type 0 [ AMR data ]

DL Direct Transfer [ NAS : DISC ] DL Direct Transfer [ NAS : RELEASE ] DL Direct Transfer [ NAS : REL COMP ]

DT1 – RANAP: * Direct Transfer [CC : DISC ] DT1 – RANAP: * Direct Transfer [CC : RELEASE ] DT1 – RANAP: * Direct Transfer [CC : REL COMP ]

MOC on IuCS 4/4

NodeB

RNC

RRC Connection Release

MSC

DT1 – RANAP: InitiatingMsg [ Iu Realease ]

NBAP: Radio Link Deletion AAL2L3: Relase ( DTCH ) AAL2L3: Relase ( DCCH )

DT1 – RANAP: SuccOutcome [ Iu Release ] AAL2L3: Release Request AAL2L3: Release Confirm

RLSD RLC

MTC on IuCS 1/5 * : Initiating Message NodeB

RNC

MSC

UDT – RANAP: Paging ( PCH ) Paging Type 1 RRC Connection Request NBAP: Radio Link Setup AAL2L3: Establish ( DCCH )

UL – DL – SYNC RRC Connection Setup RRC Connection Setup Comp Initial Direct Transfer [ NAS: PRES ]

CR – RANAP: * Initial UE Message [ MM: PRES ] CC


RNC


MSC




DL Direct Transfer [ NAS : SETUP ] UL Direct Transfer [ NAS : CCONF ]

DT1 – RANAP: InitiatingMsg [ Security Mode Control ] DT1 – RANAP: SuccOutcome [ Security Mode Control ] DT1 – RANAP: * Direct Transfer [CC : SETUP ]

DT1 – RANAP: * Direct Transfer [CC : CCONF ]

MTC on IuCS 3/5

NodeB

RNC

MSC

DT1 – RANAP: InitiatingMsg [ RAB Assignment ] Synchronised Radio Link Reconfiguration Preparation AAL2L3: Establish Request

AAL2L3: Establish Request

AAL2L3: Establish Confirm

AAL2L3: Establish Confirm Iu UP: ProcCode [ Initialisation ]

NBAP: Radio Bearer Setup

Iu UP: Ack

DT1 – RANAP: Outcome [ RAB Assignment ]


RNC

DL Direct Transfer [ NAS : ALERT ] DL Direct Transfer [ NAS : CONNECT ] DL Direct Transfer [ NAS : CONN ACK ]

MSC

DT1 – RANAP: * Direct Transfer [ CC: ALERT ] DT1 – RANAP: * Direct Transfer [ CC: CONNECT ] DT1 – RANAP: * Direct Transfer [ CC: CONN ACK ] Iu UP: Type 0 [ AMR data ] Iu UP: Type 0 [ AMR data ] Iu UP: Type 0 [ AMR data ]

DL Direct Transfer [ NAS : DISC ] DL Direct Transfer [ NAS : RELEASE ] DL Direct Transfer [ NAS : REL COMP ]

DT1 – RANAP: * Direct Transfer [CC : DISC ] DT1 – RANAP: * Direct Transfer [CC : RELEASE ] DT1 – RANAP: * Direct Transfer [CC : REL COMP ]

MTC on IuCS 5/5

NodeB

RNC


MSC

DT1 – RANAP: InitiatingMsg [ Iu Realease ]


DT1 – RANAP: SuccOutcome [ Iu Release ] AAL2L3: Release Request AAL2L3: Release Confirm

RLSD RLC

Attach on IuPS 1/2 * : Initiating Message NodeB

RNC

SGSN

RRC Connection Request NBAP: Radio Link Setup AAL2L3: Establish

RRC Connection Setup Initial Direct Transfer [ NAS: ATRQ ]

CR – RANAP: * Initial UE Message [ GMM: ATRQ ] CC

DL Direct Transfer [ NAS : ACRQ ] UL Direct Transfer [ NAS : ACRE ]

DT1 – RANAP: * Direct Transfer [ GMM: ACRQ ]

DT1 – RANAP: * Direct Transfer [ GMM: ACRE ]

Attach on IuPS 2/2 * : Initiating Message NodeB

RNC


DL Direct Transfer [ NAS : ATAC ] UL Direct Transfer [ NAS : ACOM ]


MSC

DT1 – RANAP: InitiatingMsg [ Security Mode Control ]

DT1 – RANAP: SuccOutcome [ Security Mode Control ] DT1 – RANAP: * Direct Transfer [ GMM: ATAC ]

DT1 – RANAP: * Direct Transfer [ GMM: ACOM ] DT1 – RANAP: InitiatingMsg [ Iu Release ]

NBAP: Radio Link Deletion AAL2L3: Release


PDP Context on IuPS 1/3 * : Initiating Message NodeB

RNC

Initial Direct Transfer [ NAS: SREQ ]

MSC

CR – RANAP: * Initial UE Message [ GMM: SREQ ] CC

DL Direct Transfer [ NAS : ACRQ ] UL Direct Transfer [ NAS : ACRE ]

DT1 – RANAP: * Direct Transfer [ GMM: ACRQ ]

DT1 – RANAP: * Direct Transfer [ GMM: ACRE ] DT1 – RANAP: * Common ID


DT1 – RANAP: InitiatingMsg [ Security Mode Control ] DT1 – RANAP: SuccOutcome [ Security Mode Control ]

PDP Context on IuPS 2/3 * : Initiating Message NodeB

RNC

UL Direct Transfer [ NAS : APCR ]

MSC

DT1 – RANAP: * Direct Transfer [SM : APCR ] DT1 – RANAP: InitiatingMsg [ RAB Assignment ]

NBAP: Synchronised Radio Link Reconfiguration Preparation AAL2L3: Establish NBAP: Radio Bearer Setup

DT1 – RANAP: Outcome [ RAB Assignment ]

DL Direct Transfer [ NAS : APCA ]

DT1 – RANAP: * Direct Transfer [ SM : APCA ] Application data flow on dedicated VPI/VCI using AAL5

PDP Context on IuPS 3/3

NodeB

RNC

UL Direct Transfer [ NAS : DPCR ]

DL Direct Transfer [ NAS : DPCA ] RRC Connection Release

MSC

DT1 – RANAP: * Direct Transfer [SM : DPCR ] DT1 – RANAP: * Direct Transfer [ SM : DPCA ] DT1 – RANAP: InitiatingMsg [ Iu Realease ]



CS-Control Plane between CN nodes »

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Standard SS#7 protocols are used as control plane transport layers. For circuit switched procedures ISDN user part is used to setup connections and to control the traffic channel. Procedures for network specific functions are handled by the MAP protocol, known from GSM/GPRS. Procedures for subscriber specific functions are handled by INAP and CAP protocol, also know from GSM/GPRS. More or less old specification numbers are used. Version number will indicate the type of network standard (GSM, GPRS or UMTS)

GPRS Tunneling Protocol Interfaces »

Three types of GTP protocols 1. GTP – Control Plane 2. GTP – User Plane 3. GTP‘ CGF 2. UTRAN

SGSN

3.

GGSN 1. + 2.

SGSN 2. UTRAN

SGSN other PLMN

GTP »

Tunnel is identified by Tunnel Endpoint Identifier

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C-Plane: TID-C; U-Plane: TID-D (Data)

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GTP-C: »

» »

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GTP-U: »

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Transport of application data

GTP‘: »

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Establish, management and release of user specific tunnels between GSNs for exchange of signalling information. supports creation, modification and deletion of PDP Contexts supports mobility management (relocation of RNC)

Transport of charging data records from SGSN and GGSN to Charging Gateway.


UMTS Signalling

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