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In this chapter, we have presented some of the network identities of network elements of communications networks from the GSM to the LTE system. Network identities are common as well as specific to a particular communications system. An operator may allocate network identities permanently to a network element. On the other hand, a network element can also generate network element identities and allocates temporarily to another network element at runtime. Such a network identity may address MSs/UEs over the air interface for granting, assigning, and releasing of shared radio resources by the particular RAN. This chapter discussed the usages, length, and the value range of some of the network identities.

Network identities play a very important role in troubleshooting and resolving network services‐related issues. During an inter‐RAT movement of a user, a network identity in the target RAT can be derived from the identity used in the source RAT. A network identity may carry and be encoded with several individual information/components. Such individual component further provides network‐related information or another network element identity. For more information on the network identities described in this chapter as well as other network identities and their structures, the reader may further refer to the references mentioned at the end of this book, especially the TS 23.003 [30].