The realization of high data rates in LTE technology over
an all IP network means an ever increasing load on packet data networks. 3GPP
has defined data offloading as a key solution to cope with this challenge. Data
offloading has been a critical area of study in 3GPP Release-10. The 3GPP
Evolved Packet Core (EPC) has been defined to be expansive; for example, it is
designed to work in conjunction with non-3GPP access networks, femto cells etc.,
This diversity causes more scenarios to tackle, but it also provides solutions in
the ways of offloading data from the EPC. This article is a tutorial on three
such mechanisms, namely Local IP Access (LIPA), Selected IP Traffic Offload
(SIPTO) and IP Flow Mobility (IFOM). The article starts with an overview of
data offloading methods.
The basics and key concepts of each method are summarized
before giving the requirements, architecture and procedures with high-level
message flows. The article ends with a brief evaluation of the mechanisms and
references for the reader interested in further reading. READ THE ATTACHED
PRESENTATION FURTHER
