Читать книгу Mobile Communications Systems Development - Rajib Taid - Страница 90

A 3GPP technical specification defines its scope and describes the protocols, functions, and procedures that may be applied to more than one mobile communications systems, from GSM to the 5G system. From the descriptions available in a given 3GPP TS, it is important to identify such requirements that are specific to a particular mobile communications system, i.e. GSM, GPRS, UMTS, LTE, and 5G. A 3GPP TS mentions the corresponding CN logical interface name while describing the detailed requirements of functions and procedures. Generally, a 3GPP technical specification mentions the applicability of a specific requirement/section being described using the term: A/Gb mode to refer to GSM/GPRS system; Iu mode to refer to UMTS system; S1 mode to refer to LTE/EPS system; and N1 mode to refer to 5G system. A logical interface name also identifies a particular mobile communications system that is being referred to and the requirements that belong to it.