Pre-learning :
The pre-learning for this course contains 2 hours of self study based on an interactive e-learning format. This includes lessons on the architecture of a 2G/3G network, basic operational procedures and mobility. Furthermore, the pre-learning also includes a Test of
Understanding ensuring attendees are fully prepared for the instructor led phase.
Course Content :
This course is structured into 8 sections covering:
1. The Story So Far
The course begins by introducing the 3GPP’s technical roadmap and identifies the key milestones along the way; namely 2G/3G interworking at Release 99 through to the introduction and definition of LTE in Releases 8 and 9. The section then addresses some of the key reasons for these changes and in particular, the move to an all IP based network infrastructure.
2. Network Architecture
Reviewing a current network deployment, this section describes the function of the key components found in a 2G/3G architecture. This includes detailed discussion on the various interfaces and associated protocols for both a legacy and bearer independent deployment. The section also explains the format of both the GSM/GPRS and UMTS air interfaces and in so doing explains the principles behind both TDMA and CDMA.
3. Initial Procedures
Using real network traces, this section explains the procedures that are undertaken within the network as a mobile attaches to both the circuit and packet switched domains. This includes discussion on the cell selection / re-selection process, establishing Initial / RRC Connections and conducting an IMSI / GPRS Attach. The section also explains the security mechanisms which are employed within the network.
4. Circuit Switched Operation
This section focuses on the establishment and management of circuit switched calls over legacy TDM based networks. As such, both the mobile originated and terminated call setup procedures are described using real network traces on both 2G and 3G networks. The section also includes an explanation of the different codecs in commercial operation before culminating with a detailed description of how text messages are transferred.
5. Sigtran & Soft Switching
As networks migrate to a bearer independent distributed architecture, this section explains the modifications which are required to support this IP based network. This begins with a detailed introduction into Sigtran and an explanation of the Soft Switch; MSC Server and MGW. The section also describes the requirement for the signalling protocols H.248/MEGACO and BICC prior to illustrating the call establishment process.
6. Packet Switched Operation
The establishment of a data session is explored in this section along with the various QoS criteria. This includes an explanation of the PDP context activation procedures followed by a comprehensive explanation of packet data transfer in 2G/3G networks. Once again to aid learning, real network traces are utilized within the mpirical interactive. Finally, Dual Transfer Mode is briefly discussed.
7. Mobility & 2G / 3G Interworking
This section describes the various procedures which are undertaken to support mobility within a GSM/UMTS network. This includes not only the different soft and hard handovers but also the impact on the network of inter BSC/MSC handovers and RNC relocations. Packet switched mobility is also discussed in detail prior to describing, using real examples, how connections are maintained during 2G/3G interworking.
8. Increasing Capacity with EDGE & HSPA
The final section of the course describes how capacity has been increased on the air interfaces using EDGE and HSPA technologies. In so doing, the principles of EDGE and Evolved EDGE within 2.5G networks are described in detail prior to explaining HSDPA and HSUPA operation within UMTS. HSPA+ is also explained along with a brief introduction to MIMO.