**1.1 New generation nerworks (4G)**

Currently, the 3rd Generation Partnership Project forum (3GPP) is working to complete the standard that aims to ensure the competitiveness of UMTS in the future. As a result of this work, in 2004 the Long Term Evolution project (LTE) arises, which is expected to become the 4G standard. We can find the requirements for 4G standardization in recent works like "Release 10" and "Advanced LTE".

On the other hand, the System Architecture Evolution (SAE) is a project that seeks to define a new core component of the all-IP network called Evolved Packet Core (EPC). We can consider IPv6/MPLS as part of the development of the LTE standard included in the all-IP concept to meet some requirements of LTE, such as end-to-end quality of service (MPLS, Diffserv, IntServ). SAE allows interoperability with existing technologies in both the core and access networks.

The figure 1 shows the relation between 2G, 3G & LTE technologies and the packet core that is intended to evolve with SAE.

Due to the increasing demand of QoS by users, it is necessary to adopt mechanisms to ensure the requirements of LTE/SAE. As is well known, an all-IP network provides the socalled Best Effort quality of service. For this reason, in order to provide QoS to the LTE/SAE network's core and to the access networks, we propose the implementation of IPv6 (extensions/MPLS into the Evolved Packet Core (EPC).
