Chapter 6

Transport and Core Network

Juha Kallio, Jyrki T. J. Penttinen, and Olli Ramula

6.1 Introduction

This chapter presents the functional blocks and interfaces of LTE. The new architecture is illustrated using comparisons with solutions in earlier mobile communications systems. The protocol layer structure and functioning of the LTE protocols is described, and examples are given in order to clarify the principles of each protocol.

6.2 Functionality of Transport Elements

The sections that follow give a practical description of the MME, S-GW, P-GW and the respective transport modules. The information below is a snapshot of typical functionalities that can be applied in the core network of LTE/SAE. The complete list of functionalities depends on the vendor and the commercialization time schedules, so more specific information should be obtained from each vendor directly.

6.2.1 Transport Modules

Figure 6.1 shows an example of a transport module by Nokia Siemens Networks. It is characterized by the following:

  • x E1/T1/JT1;
  • IPSec support;
  • Ethernet switching;
  • ToP (IEEE1588-2008), Sync Ethernet.

In this specific case of an NSN transport element solution, there are two options. The FTLB contains 3 × GE, divided to 2 × GE electrical + 1 × GE optical via SFP module, while the FTIB contains 2 × GE.

Figure 6.1 An example of Flexi Multiradio BTS System Module with Flexi Transport submodule (FTLB/FTIB) by Nokia Siemens Networks. Printed by courtesy of Nokia Siemens Networks.

6.2.2 LTE ...

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