signalling in atm networks

RN33013EN20GLA0_Signalling in ATM Network (RNC)1 © Nokia Siemens Networks

Signalling in ATM Network (RNC)RN3301-20A RU20 RAN Integration


Objectives

At the end of this module the participants will be able to:

• Identify the entities required for implementing message routing on MTP layer level

• Explain the concept of CCS7 signalling in RNC.

• List the steps needed to set up the SS7 layers of RNC interfaces

• Configure CCS7 signalling in RNC


Physical layer

ATM layer

SignallingAAL AAL

Signalling protocol User data

C-Plane U-Plane

Signalling Protocol Layers in 3G ATM Network


Signaling Protocol Layers

SAAL Signaling ATM Adaptation LayerSCCP Signalling Connection Control PartSSCF Service Specific Coordination FunctionSSCOP Service Specific Connection Oriented

AAL5 ATM Adaptation Layer 5B-ISUP Broadband ISDN User PartMTP3 Message Transfer Part lever 3NBAP Node B Application Protocol

AAL5

Physical Layer

ATM Layer

SAR

CPCS

SSCOP (Q.2110)

SSCF (Q.2140)

MTP3b

SSCS SAAL

SS#7

B-ISUP

NNI

SAAL UNI SAAL NNI

AAL5

Signaling protocol e.g. NBAP

UNI

Physical Layer

ATM Layer

SAR

CPCS

SAAL

SSCOP (Q.2110)

SSCF (Q.2130)SSCS

AAL5

SCCP

RNSAP/RANAP

5 © Nokia Siemens Networks

RNC

RNC

MGW

ATM network

Ethernet network

Iur

Iu-CS

Iu-PS

IP over ATM

Control plane protocols

AAL5

ATM

SCCP

SGSN

M3UA

SCTP

IPv4

M3UA and SCTP support required

M3UA and SCTP support required

ATM/Ethernet interworking router

RANAP RNSAP

Iu-CS & Iu-PS

Iur

IP over ATM

IP over ATM

IP Based Control Plane at Iu and Iur


SS7 protocols in Iu-CS, Iu-PS and Iur

• To allow for the communication using the ATM-based control plane, the following SS7 signalling parts must be defined in both elements:

– MTP3

– SCCP

– Application protocols (RANAP/RNSAP)

• To allow for the communication using the IP-based control plane, the following SS7 signalling parts must be defined in both elements:

– M3UA

– SCCP

– Application protocols (RANAP/RNSAP)

RANAP (Iu-CS) RNSAP (Iur)

SCCP

MTP3b

AAL5

ATM


SCCP

M3UA

SCTP

IP

AAL5

ATMATM-based

IP-based over ATM


Configuring IP and SCTP for IP Control Plane

• Only if implementing the new feature, IP Control Plane

• To define the IP configuration, the following must be defined:

– IP address of ICSU

– Static route to next hop

– Internal routing over ATM

• To define the SCTP, the following must be defined:

– Association set

– Association

– Source IP addresses


SCCP

MTP3b

AAL5

ATM


SCCP

M3UA

SCTP

IP

AAL5

ATMATM-based

IP-based over ATM


Association Set SCTP Association

IP

Servere.g. RNC

ICSU_0

ICSU_1

ICSU_2

SPC_1

ISU_0

ISU_1

ISU_2

IP Addresses

SPC_2

Cliente.g. MGW

• One signalling link consists of one association set

• One association set consists of max 16 associations for ordered messages

• Signalling link is active when at least 1 association is active

• Signalling linkset is active when at least 1 signalling link is active

• SLS field is used to select the appropriate association

• One signalling unit can be connected to multiple association sets but inside one association set the unit is only connected to one association.

SIGTRAN routing: SCTP Associations


Integration steps – SIGTRAN

• Create an association set

• Add associations to the association set

• Check the associations

• Give IP addresses to own signalling units

• Create source IP addresses for SCTP

• Create IP type SS7 signalling link and link set

• Create the SS7 signalling route set


SPC=123

SPC=234

SPC=345

Signaling LinkLinkset for SPC123->SPC345

Routeset for SPC123->SPC345

NA0

Physical Layer

ATM-Layer

MTP

SCCP

Route SetLinkset

Link

Application Protocol

SAAL-Layer

AAL2Sig

Message Transfer Part (MTP)


Creation Steps1. Create MTP Services

1. SNM 2. SNT 3. SCCP4. AAL2Sig

2. Create own SPC3. Create Signalling Link4. Create LinkSet 5. Create Routeset 6. Activate Links 7. Activate Routeset 8. Create SCCP and SCCP subsystem 9. Activate SCCP and subsystems

(already done by System )

Creation steps of MTP and SCCP


Signalling Between Two NE’s via STP


1. Create own SCCP signalling point and own subsystems

2. Create remote SCCP signalling points and remote subsystems

3. Activate own / remote SCCP and Subsystem

4. Set local and remote Broadcast on

ZNF...

RANAPSCMG

ZNFD

(SCCP Management, created automatically by the System)

ZNFD

ZNGCZNHC

Local:

RNC MSS

affectedconcerned

ZOBC Remote:

RNC MSS

concernedaffected

ZOBM

Info Info

Creation of SCCP and SCCP Subsystems

Note: Remote Broadcast is unnecessary


3270 RNC A

RANAP

SCMGRANAP

Remote 3259 (SGSN)

SCMGRNSAP

Remote 3280 (RNC B)

3250 MGW

SCMGRANAP

Local 3250

SCMGRANAP

Remote 3270 (RNC A)

3280 RNC B

SCMG

Local 3280

RNSAP

SCMGRNSAP

Remote 3270 (RNC A)

3259 SGSN

SCMGRANAP

Local 3259

SCMGRANAP

Remote 3270 (RNC A)

SCMGRANAP

Local 3270

RNSAP

SCMG

Remote 3250 (MGW)

Local and Remote SCCP Subsystems


SCCP and SCCP Sub-Systems Example

RNC IPA2800 2008-01-29 20:06:57

SUBSYSTEM STATES

NETWORK: NA0 POINT H/D: 0601/01537 SP NAME: SGSN1============ ============================= ==============DESTINATION: ROUTING: SPNO H/D SS NAME STATE RM NET SP CODE H/D NAME STATE------ ------- ----- -- --- ------------------ ----- -------01/001 SCMG AV - NA0 0601/01537 SGSN1 AV-EX

8E/142 RANAP AV - NA0 0601/01537 SGSN1 AV-EX

NETWORK: NA0 POINT H/D: 0602/01538 SP NAME: RNC01============ ============================= ==============DESTINATION: ROUTING: SPNO H/D SS NAME STATE RM NET SP CODE H/D NAME STATE------ ------- ----- -- --- ------------------ ----- -------01/001 SCMG AV - NA0 0602/01538 RNC01 AV-EX

8E/142 RANAP AV - NA0 0602/01538 RNC01 AV-EX

8F/143 RNSAP AV - NA0 0602/01538 RNC01 AV-EX

NETWORK: NA0 POINT H/D: 0820/02080 SP NAME: INMSS============ ============================= ==============DESTINATION: ROUTING: SPNO H/D SS NAME STATE RM NET SP CODE H/D NAME STATE------ ------- ----- -- --- ------------------ ----- -------01/001 SCMG AV - NA0 0820/02080 INMSS AV-EX

8E/142 RANAP AV - NA0 0820/02080 INMSS AV-EX


Command Summary (1/2)

Control Plane

MTP Services

Own SPC

Signalling Link

ZNPI

ZNRI

ZNPC

ZNRP

SS7 or IP

Association Set

Association

Source IP

ZOYI

ZOYL

ZOYC

ZOYA

ZOYN

ZNCS ZNCI

1


Command Summary (2/2)

Signalling Link Set ZNSIZNSC/ZNSP

Signalling Route Set ZNRIZNRC

Activate Signalling Link ZNLIZNLA/ZNLC

Activate Signalling Route Set ZNVIZNVA/ZNVC

Local&Remote Subsystems ZNFI/ZNFJZNFD

Activate Local&Remote SCCP ZNGIZNGC

Activate Local&Remote Subsystems

ZNHIZNHC

Broadcasting ZOBI/ZOBLZOBM/ZOBC

1


Review Questions

1. Fill in protocol stack for RNC signalling over ATM below:

2. Which MTP services are required on RNC?

3. Which SCCP subsystems are required on RNC?

RANAP (Iu- CS/PS) RNSAP (Iur)

ATM


Review Questions

4. Where is the ATM interface, VPI and VCI for signalling configured in MML?

5. Where is the signalling point code (SPC) of destination and the used signalling transfer point (STP) configured in MML?

6. What is the correct status of an SCCP subsystem?

signalling in atm networks

Documents