In 2004, 3GPP began a study into the long term evolution of UMTS. The aim was to
keep 3GPP’s mobile communication systems competitive over timescales of 10 years
and beyond,by delivering the high data rates and low latencies that future users would require.
In the new architecture, the evolved packet core (EPC) is a direct replacement for the packet
switched domain of UMTS and GSM. It distributes all types of information to the user, voice as
well as data,
using the packet switching technologies that have traditionally been used for data alone.
There is no equivalent to the circuit switched domain: instead, voice calls are transported using
voice over IP. The evolved UMTS terrestrial radio access network (E-UTRAN) handles the EPC’s
radio communications with the mobile, so is a direct replacement for the UTRAN.
The mobile is still known as the user equipment, though its internal operation is very
different from before.
The new architecture was designed as part of two 3GPP work items, namely system
architecture evolution (SAE), which covered the core network, and long term evolution
(LTE), which covered the radio access network, air interface and mobile. Officially, the
whole system is known as the evolved packet system (EPS), while the acronym LTE refers
only to the evolution of the air interface. Despite this official usage, LTE has become a
colloquial name for the whole system, and is regularly used in this way by 3GPP.
keep 3GPP’s mobile communication systems competitive over timescales of 10 years
and beyond,by delivering the high data rates and low latencies that future users would require.
In the new architecture, the evolved packet core (EPC) is a direct replacement for the packet
switched domain of UMTS and GSM. It distributes all types of information to the user, voice as
well as data,
using the packet switching technologies that have traditionally been used for data alone.
There is no equivalent to the circuit switched domain: instead, voice calls are transported using
voice over IP. The evolved UMTS terrestrial radio access network (E-UTRAN) handles the EPC’s
radio communications with the mobile, so is a direct replacement for the UTRAN.
The mobile is still known as the user equipment, though its internal operation is very
different from before.
The new architecture was designed as part of two 3GPP work items, namely system
architecture evolution (SAE), which covered the core network, and long term evolution
(LTE), which covered the radio access network, air interface and mobile. Officially, the
whole system is known as the evolved packet system (EPS), while the acronym LTE refers
only to the evolution of the air interface. Despite this official usage, LTE has become a
colloquial name for the whole system, and is regularly used in this way by 3GPP.
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