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AAL Type 2 Signalling Protocol (AAL2SIG)
Switching Core Network Signalling
M14 / U4
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Nokia Siemens Networks Academy
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Document change history
Date Version Name Change comment
18.2.08 1 Gatot Mardianto M14/U4 upgrade from M13
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Functionality
•AAL type 2 signalling (AAL2SIG) protocol provides the signalling capability to establish, release and maintain AAL type 2 point to point connections across series of ATM VCCs that carry AAL type 2 links.
•These services are accessible via the AAL type 2 served user service access point (A2SU-SAP).
•The AAL type 2 signalling protocol also provides maintenance functions associated with AAL type 2 signalling.
•AAL type 2 signalling is defined by ITU-T Q.2630 recommendation.
•M14/U4 implements Q.2630.2 (Capability Set 2)
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Protocol stacks
•AAL2SIG can be run over 2 different protocol stacks– MTP3b/SAAL/ATM : used in IuCs, Nb
– SAAL/ATM : used in Iub
AAL5
AAL2SIG (Q.2630.2)SSCF-UNI
SSCOPAAL5
AAL2SIG (Q.2630.2)
MTP3SSCF-NNI
SSCOP
IuCS/Nb Iub
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Protocol Structure for Iu-CS
TransportNetworkLayer
RadioNetworkLayer RANAP Iu User Plane
Protocol
AAL2
ATM
Control Plane
Transport NetworkControl Plane
User Plane
Physical Transmission layer
AAL5
SCCP
MTP3
SSCF-NNI
SSCOP
AAL5
Q.2630.2
MTP3
SSCF-NNI
SSCOP
Transport NetworkUser Plane
Transport NetworkUser Plane
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TransportNetworkLayer
RadioNetworkLayer
Q.2630.2
NBAP
DC
H F
P
AAL2
Transport NetworkUser Plane
Transport NetworkUser Plane
ATM
Transport NetworkControl Plane
Physical Transmission layer
AAL5
SSCF-UNISSCOP
AAL5
Q.2150.2
SSCF-UNISSCOP
RA
CH
FP
FA
CH
FP
PC
H F
P
DS
CH
FP
CP
CH
FP
User PlaneControl Plane
Protocol Structure for Iub
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ATM Adaptation Layer and Supported Traffic
Typical
Use
Voice Video
Voice(silence removed)
Audio
Data
IP
Frame relay
Data
SMDS
AAL AAL1 AAL2 AAL5 AAL3/4
Connection Oriented Connectionless
Synchronised Not Synchronised
Constant VariableBit Rate
Source & Dest.
Connection
ATM Layer
Physical Layer
A B C D
ATM Service Classes
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AAL5
PADDING, variable length to fill the 48-byte ATM cell
AAL5 PACKET, fixed header, variable length payload
ATM CELL, 5-byte header + 48-byte payload
AAL5 Packet Data Unit
USER DATA - Variable length 1 - 65 535 bytes
PAYLOAD = N x 48 BYTES
AAL5 Packet Data Unit
USER DATA - Variable length 1 - 65 535 bytes
AAL5header
ATM cell 1 ATM cell 2………... ………..ATM cell n
Suit for data which no
timing request
between Tx and Rx
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AAL2
OFFSET, 1 byte (indicates where the next AAL2 PDU starts)
AAL PACKET, fixed header, payload
ATM CELL, 5-byte header + 48-byte payload
String of AAL Packet Data Units
1 2 3 4
AALheader
ATM CELLHEADER 1 2 3 4
ATM cell
Transmission pathVirtual PathVirtual Channel (VC)ATM Cell
User Layer
ATM Adaptation Layer
ATM Layer
Suit for delay sensitive application
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Functional architecture of AAL type 2 signalling
T11104330-99
AAL type 2switch
A2SU-SAP A2SU-SAPL
M-S
AP
LM
-SA
P
LM
-SA
P
Lay
erm
anag
emen
t
Lay
erm
anag
emen
t
Lay
erm
anag
emen
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AAL type 2
Signalling message
AAL type 2
Signalling message
(Note)
GST-SAP GST-SAP GST-SAP GST-SAP
Signalling transport(e.g. MTP3b + NNI-SAAL, UNI-SAAL, SSCOP, ...)
Signalling transport(e.g. MTP3b + NNI-SAAL, UNI-SAAL, SSCOP, ...)
AAL type 2service endpoint
AAL type 2service endpoint
AAL type 2served user
Signallingtransportconverter
Signallingtransportconverter
Signallingtransportconverter
Signallingtransportconverter
AAL type 2served user
Protocolentity
Protocolentity
Protocolentity
Protocolentity
Nodalfunction
Nodalfunction
Nodalfunction
AAL type 2signalling entity
AAL type 2signalling entity
AAL type 2signalling entity
(Note) (Note) (Note)
NOTE – In every AAL type 2 node, a signalling transport converter instance is associated with each AAL type 2 signalling transport.
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AAL type 2 signalling protocol entities
•Outgoing protocol procedures provide the mechanism to initiate an AAL type 2 connection request and also release of AAL type 2 connection.
•Incoming protocol procedures are applied when a request for an AAL type 2 connection is received from the peer entity and also provide release of AAL2 type 2 connection.
•Maintenance protocol procedures provide mechanisms to align the status of AAL type 2 resources at two adjacent AAL type 2 nodes and the procedures to block and unblock an AAL type 2 path.
•The nodal function provides the bridge between incoming and outgoing protocol entities, perform the routing functionality and keeps track of the AAL type 2 resources.
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AAL type 2 signalling protocol message format
Signalling association identifier has fixed size field of 4 octets.
When it is used as destination signalling association identifier and has value unknown then field is set to ‘0’.
If it is used as originating signalling association identifier, it can not have value ‘0’.
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AAL type 2 message identifiers
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Compatibility table for message and parameter
a) Send notification indicator
0 Do not send notification
1 Send notification
a) Instructor indicator
00 Pass on message or parameter
01 Discard parameter
10 Discard message
11 Release connection
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AAL type 2 parameter format
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Parameters of AAL type 2 signalling messages (1)
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Parameters of AAL type 2 signalling messages (2)
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Identifiers of the AAL type 2 message parametersAAL type 2 parameter Acronym Identifier
Cause CAU 00000001
Connection Element Identifier CEID 00000010
Destination E.164 Service Endpoint Address ESEA 00000011
Destination NSAP Service Endpoint Address NSEA 00000100
Link Characteristics LC 00000101
Modify Support for Link Characteristics MSLC 00001110
Modify Support for Service Specific Information MSSSI 00001111
Origination Signalling Association Identifier OSAID 00000110
Path Type PT 00010000
Preferred Link Characteristics PLC 00010001
Preferred Service Specific Information (Audio Extended) PSSAIE 00010010
Preferred Service Specific Information (Multirate Extended) PSSIME 00010011
Served User Correlation ID SUCI 00010100
Served User Generated Reference SUGR 00000111
Served User Transport SUT 00001000
Service Specific Information (Audio Extended) SSIAE 00010110
Service Specific Information (Audio) SSIA 00001001
Service Specific Information (Multirate Extended) SSIME 00010111
Service Specific Information (Multirate) SSIM 00001010
Service Specific Information (SAR- Assured) SSISA 00001011
Service Specific Information (SAR – Unassured) SSISU 00001100
Test Connection Indicator TCI 00001101
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Explanation of parameters
Cause (CAU)• Gives the reason of an operational error• Describes the reason for the release of connection• Indicates the reason why connection could not established
Connection element identifier (CEID)• It consists of AAL type 2 path identifier and Channel identifier (CID). • AAL type 2 path identifier has field size of 4 octets. A value of ‘0’ in all octets
indicates “Null”.• Channel identifier has field size of 1 octet. It can have value in the range of 8 to
255. A value of ‘0’ indicates “Null”.
AAL type 2 service endpoint address (A2EA)• It carries end point address of the destination.• It can have E.164 or NSAP format.
Served User Generated Reference (SUGR)• It carries an unmodified reference provided by the originating ALSU to the
destination served user. Binding ID is used as this reference number
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Explanation of parameters
Served User Transport (SUT)•It carries the served user data unmodified to the destination served user.
Test Connection Indicator (TCI)
•It indicates that the AAL type 2 connection to be established is a test connection SSCS information (SSCS)• It identifies the type and the capabilities of an AAL type 2 SSCS protocol.
- service specific information (audio)
- service specific information (multirate)
- service specific information (SAR)
Link Characteristics (LC)•It gives an indication of the resources required for the AAL type 2 connection and is used only for AAL type 2 path selection and connection admission control.
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Implementation in M14/U4
•ANI – Adjacent AAL type 2 node identifier It identifies adjacent AAL type 2 node by unique name.
•AAL type 2 path identifier It identifies AAL type 2 path by unique number.
•AAL2 SEA – AAL type 2 Service Endpoint Address Address of AAL2 Service Endpoint in E.164 format.
•Ownership It indicates whether the AAL type 2 path is owned by AAL type 2 signalling entity or its peer.
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Successful AAL type 2 connection establishment
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Successful AAL type 2 connection release
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Example of management operation
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MML: Create Routing Objects for Iu Interface
•Create ATM Route in MGW towards RNC: Route = 11ZRRC:ROU=11,TYPE=AAL2:PRO=MTP3:NET=NA0,SPC=701,ANI=AAL2RNC1;
• Check that there is free VCLtp ZLCI: <interface id>,VC:<VPI>:FREE;
•Create an endpoint of VC level under Route 11. Path is 5, Interface Id is 2, VPI 1, VCI 33. Loss ratio 10 exp -3 , Mux delay 10 msZLJC:11,5:2,1,33:LOCAL:3,100;
•Unblock AAL2 path, waiting time for blocking commands is 18 secondsZLSU:AAL2RNC1:11:18;
• Interrogate AAL type 2 service endpoint addressZWEI:AAL2:SEA=35822;
ANI
Path ID(in Connection ID = VP/VC)
Owner
AAL2 E.164 address
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