Transcript
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ATM Protocols and Signaling
- Fundamentals -
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ATM protocol for signaling
Signaling protocol can be looked at as an important application running on top of the
lower, physical, ATM and AAL layers
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Signaling Protocols Layers
Signaling occurs over a Signaling ATM Adaptation Layer (SAAL) residing between theATM layer and the signaling protocol
The SAAL provides reliable transport of signaling message between two ATM systemsto include the recovery of multiple gaps within the data stream
The SAAL is composed of the sub layers:
Common Part
Based on ALL5
Consists of to additional sub layers Segmentation and Reassembly Sublayer (SAR)
Common Part Convergence Sublayer (CPCS)
Service Specific Part
Service Specific Co-ordination Function (SSCF)
The SSCF maps signaling messages from the upper level into SSCOP
Service Specific Connection oriented protocol (SSCOP)
Provides mechanisms for establishing, releasing and monitoring signaling information exchange between signaling
entities
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Signaling Protocols Layers
There are two types of SAAL:
SAAL-NNI
SAAL-UNI
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AAL Type 2 Signaling
Provides functions to dynamically establish and release AAL type 2 point to pointconnections as requested by AAL2 served users in a network comprised of AAL2endpoint and AAL2 switches
The AAL2 served user in 3G networks is the radio resource management and controlentity which establishes/releases AAL2 connections when new soft handover legs are
established/released
The AAL2 signaling protocol is used by higher layer functionalities for AAL2connection establishment and release of a connection
I can establish an AAL2 connection, release an AAL2 connection and maintenance
functions to align the status of the AAL2 resources within the two peer AAL2 nodes
It offers a reset mechanism which is used to return one or several AAL2 channels toidle condition
Also contains mechanism for blocking and unblocking resources during testprocedures
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AAL2 Signaling protocol architecture
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General Protocol model for UTRAN
terrestrial interfaces
The protocol structures in UTRAN terrestrial interfaces (Iu, Iur, Iub) are designed
according to the same general protocol model as in the figure
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General Protocol model for UTRAN
terrestrial interfaces Horizontal layers
Radio network layer All UTRAN related issues are visible only in the radio network layer
Transport network layer Represents standard transport technology that is selected
Vertical planes
Control Plane Used for all 3G specific control signaling
It includes the application protocol (RANAP in Iu, RNSAP in Iur, NBAP in Iub) and the signaling bearer for transporting theapplication protocol messages
The application protocol is used among other things for setting up bearers to the UE
User plane All information sent and received by the user, such as coded voice in a voice call or the packets in an Internet connection are
transported via the user plane
The user plane includes the data stream and the data bearer Transport network control plane
Is used for all control signaling within the transport network layer
It includes the ALCAP (Access Link Control Application Part) protocol that is needed to set up the transport bearers for theuser plane
Transport network user plane The data bearers in the user plane and the signaling bearers for the application protocol also belong to the transport user
plane
The data bearers in the transport network user plane are directly controlled by the transport network control plane
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Protocol Structure for Iub
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Protocol Structure for Iur
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Protocol Structure for Iu-CS
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Protocol Structure for Iu-PS
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ATM adaptation layer for user plane
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ATM adaptation layer for control plane
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ATM adaptation layer for transport network
control plane
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Protocol stack for circuit switched data
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Protocol stack for packet switched data
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Protocol stack for Iur interface
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Protocol stack for AAL 2 signaling
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