Читать книгу Mobile Communications Systems Development - Rajib Taid - Страница 116

This chapter covers the various identities that are used to identify and address different network elements or logical objects of mobile communications systems and networks, i.e. Global System for Mobile Communication (GSM), General Packet Radio Service (GPRS), Universal Mobile Telecommunication System (UMTS), and Long‐Term Evolution (LTE) system. Network identities used in the 5G system are described in Chapter 16. Every network element has its own identity using which the peer network element can identify the source of data received over a particular interface.

We begin with the network identities that are used at the radio access and core network (CN) domain along with their nature. A network element identity has several other aspects such as its persistency, which may be either permanent or temporary; also, an identity may have a local or global presence. A network element can have several identities, especially if it supports multiple radio access technologies (RATs). We then present the fundamental or native and mapped identity of a network element. Mapped identities are used in case of an interworking scenario where a user and its User Equipment (UE) move from one RAT to another and vice versa.

A network identity may be used by a network element to keep track of the resources allocated to another network element. Apart from the network elements, network identities are also assigned to identify and address other logical objects such as the GSM location area, GPRS routing area, and LTE/Evolved Packet System (EPS) tracking area. Such network identities are further described in Chapter 18.