BICC Protocol and Application

The Architecture of 3G- R4

1.Definition and function:

Call Control Signaling like setting up a call, tear down, negotiation of parameters

Provides signaling independent of bearer technology and signal transport technology

BICC is Adaptation of ISUP as defined in the scope of Recommendation Q.1901 series

-BICC apply in the Nc interface

Basic Concept

- Serving node:

CSF: Call Service Function, performs call control

BCF: Bearer Control Function, performs bearer control function

SN: CSF with associated BCF

CMN: CSF without any BCF associated

- SN types : The component of SN are :

1.ISN : provides the interface with non-BICC networks and terminal equipment

2.GSN : provides gateway functionality between two network domains

3.TSN : provides transit functionality between ISNs and GSNs

- Separation between call and bearer

Network model of BICC

BICC protocol Model

- Signalling Transport Layer :

MTP3 for TDM Network

SCTP over IP for IP network

SSLOP for TAM network

- STC : Signalling Transport Converters. Mapping function according to underlying layers

Structure of the Protocol Stack

there are 4 types of Protocol stacks :

1.TDM based

2. M3UA based

3.SCTP/IP based

4.ATM based

The 4 types of protoco stacks as above are depend each Telecom operators requirement, or the system support which type.

BICC Message Structure

- Call Instance Code (CIC) is a logic number associated with the inter-office calling relation

Format of BICC messages

- CIC
- is used to identify signalling relation between peer BICC entities and associate all the PDUs to that relation.
- message type code
- the mandatory fixed part
- the mandatory variable part

- the optional part, which may contain fixed length and variable length parameter fields

Blocking and Unblocking of CIC

- All outgoing non test calls are blocked using those CIC values
- Incoming non test call with those CIC leads to error case
- Incoming Test calls with those CIC values are permitted to be carried out
- Outgoing test calls using those CIC values are also permitted

Main message of BICC protocol

- IAM：Initial address message

-APM：Application transport message

-ACM：Address complete message

-ANM：Answer message

-REL：Release

-RLC：Release complete

Basic Call Setup

- Forward Bearer Setup

No Tunnel case

Fast Tunnel

Delayed Forward Tunnel