This chapter considers the main protocols used in the EPS, with the aim of giving a basic overview of these protocols and their basic properties.
16.2 GPRS Tunneling Protocol Overview
The original version of the GTP protocol was the result of GSM standards development to cater for specific needs such as mobility and bearer management and tunneling of user data traffic for GPRS. Then 3GPP further enhanced GTP for use in 3G. During the development of EPS, the GTP track of the architecture was enhanced considerably to improve the bearer handling and thus the GTP control-plane protocol was upgraded to GTPv2-C.
The two main components of GTP are the control-plane part of GTP (GTP-C) and the user-plane part of GTP ...