UMTS Core Network Signalling Duration: 3 days

UMTS Core Network Signalling
CONTENT
This course describes protocols used in the core network part of modern 2G/3G mobile networks. The brief description of various transport network protocols (SS7, ATM, and IP) is followed by detailed technical description of application layer protocols. Some aspects of user plane transport are covered as well (packet data tunnelling, circuit-switched traffic in ATM- or IP-based networks). A number of signalling scenarios are described and analysed step by step. Topics included: MAP, GTP, CAMEL, H.248, BICC and SIP-I.

PREREQUISITES
The high-level knowledge about the 2G/3G network structure, nodes, and procedures for various scenarios is highly recommended. For background knowledge, we recommend Apis GSM/UMTS/EPS System Overview.

Network introduction
•    Overview of 3GPP UMTS core network
•    Brief overview of functions of various nodes
•    Protocols used on different interfaces
•    3GPP network evolution in different releases

Basics of SS7
•    Overview of Signalling System No. 7
•    SS7 protcols in fixed and mobile networks
•    Functions of Message Transfer Part
•    Functions of Signalling Connection Control Part

Transport: ATM & IP
•    Basic ATM concepts
•    Usage of AAL2 and AAL5 in 3GPP networks
•    Application of Signalling ATM Adaptation Layer
•    Basic IP concepts
•    Overview of transport protocols: UDP, TCP, SCTP
•    RTP and RTCP for real-time traffic transport

GTP-C version 1
•    GTP variants and versions
•    Location management procedures
•    Tunnel management procedures
•    Mobility management procedures
•    Path management procedures

Mobile Application Part
•    MAP interfaces in 3GPP networks
•    MAP operations for mobility, call handling, supplementary services management, recovery, etc.
•    MAP versions: handling and negotiation of application context names and versions

CAMEL
•    CAMEL phases in different 3GPP releases
•    Triggering of CAMEL call/session handling
•    CAMEL subscription information records, their types and parameters
•    Example CAMEL operations

H.248 – Gateway Control Protocol
•    Applications for H.248/MEGACO
•    The H.248 model: terminations, contexts, commands
•    H.248 packages
•    Transport of H.248 messages

BICC and SIP-I
•    Basic BICC concepts, messages, and procedures
•    Q.1970/Q.1990 tunnelling
•    Forward and backward through-connection
•    Overview of basic SIP protocol
•    SIP-I option for Nc interface
•    Session Description Protocol
•    SDP usage for Nb interface data flows

User data transfer
•    Nb interface user plane frame protocol
•    AMR and AMR-WB formats and transport
•    Transcoder-free and tandem-free operation
•    Tunnelling of packet-switched user data with GTP-U
•    Collapsed core network architecture: direct data transfer between GGSN and UTRAN

Signalling scenarios
A number of signalling scenarios is discussed and analysed step-by-step throughout the course, investigating individual messages and their parameters:
•    Call setup variations, using ISUP, BICC, SIP-I, and CAMEL
•    Mobility scenarios using MAP
•    PDP context handling using GTP

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