3GPP Long Term Evolution and System Architecture Evolution (LTE and SAE)

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12 Δεκ 2013 (πριν από 3 χρόνια και 5 μήνες)

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GSC:
Standardization Advancing
Global Communications

3GPP Long Term Evolution and
System Architecture Evolution
(LTE and SAE)


Francois Courau

SOURCE:

ETSI

TITLE:

3GPP LTE and SAE

AGENDA ITEM:

Joint 4.1

CONTACT:

Francois.courau@alcatel.fr


GSC11/Joint(06)_32r1

GSC:
Standardization Advancing Global
Communications

3GPP LTE and SAE


LTE focus is on:


enhancement of the Universal Terrestrial Radio
Access (UTRA)


optimisation of the UTRAN architecture


With HSPA (downlink and uplink), UTRA will
remain highly competitive for several years


LTE project aims to ensure the
continued
competitiveness

of the 3GPP technologies for
the future

GSC:
Standardization Advancing Global
Communications

3GPP LTE and SAE


SAE focus is on:


enhancement of Packet Switched technology
to cope with rapid growth in IP traffic


higher data rates


lower latency


packet optimised system


through


fully IP network


simplified network architecture


distributed control

GSC:
Standardization Advancing Global
Communications

3GPP LTE and SAE


Reminder of LTE objectives


Demand for higher data rates


Expectations of additional 3G spectrum allocations


Greater flexibility in frequency allocations


Continued cost reduction


Keeping up with other (including unlicensed)
technologies
(eg WiMAX)


Growing experience with the take
-
up of 3G is helping
to clarify the likely requirements of users,

operators and service providers in the

longer term

GSC:
Standardization Advancing Global
Communications

3GPP LTE and SAE


Goal of LTE



Significantly increased peak data rates, scaled
linearly according to spectrum allocation


Targets:


Instantaneous downlink peak data rate of 100Mbit/s in
a 20MHz downlink spectrum (i.e. 5 bit/s/Hz)


Instantaneous uplink peak data rate of 50Mbit/s in a
20MHz uplink spectrum (i.e. 2.5 bit/s/Hz)



GSC:
Standardization Advancing Global
Communications

3GPP LTE and SAE


Latency issue


Control
-
plane


Significant reductions in transition times from idle or dormant states
to active state







User
-
plane


Radio access network latency below less than 5 ms


in unloaded condition (ie single user with single data


stream) for small IP packet


Latency also being addressed in SAE





Camped
-
state

(idle)

Active

(Cell_DCH)

Dormant

(Cell_PCH)


Less than 100msec

Less than 50msec

GSC:
Standardization Advancing Global
Communications

3GPP LTE and SAE


Status of the work for LTE


Downlink Parameter for OFDM


Transmission BW

1.25 MHz

2.5 MHz

5 MHz

10 MHz

15 MHz

20 MHz

Sub
-
frame duration

0.5 ms

Sub
-
carrier spacing

15 kHz

Sampling frequency

1.92 MHz

(1/2


3.84 MHz)

3.84 MHz

7.68 MHz

(2


3.84 MHz)

15.36 MHz

(4


3.84 MHz)

23.04 MHz

(6


3.84 MHz)

30.72 MHz

(8


3.84 MHz)

FFT size

128

256

512

1024

1536

2048

Number of occupied

sub
-
carriers
†, ††

76

151

301

601

901

1201

Number of

OFDM symbols

per sub frame

(Short/Long CP)

7/6

CP
length
(
μ
s/samples)

Short

(4.69/9)


6,

(5.21/10)


1*

(4.69/18)


6,

(5.21/20)


1


(4.69/36)


6,

(5.21/40)


1


(4.69/72)


6,

(5.21/80)


1


(4.69/108)


6,

(5.21/120)


1


(4.69/144)


6,

(5.21/160)

1


Long

(16.67/32)

(16.67/64)

(16.67/128)

(16.67/256)

(16.67/384)

(16.67/512)

GSC:
Standardization Advancing Global
Communications

3GPP LTE and SAE


Uplink Parameters
(Variant including TD SCDMA framing also supported)



Transmission BW

1.
25

MHz

2.5 MHz

5 MHz

10 MHz

15 MHz

20 MHz

Timeslot

duration

0.
67
5 ms

Sub
-
carrier spacing

15 kHz

Sampling frequency

1.92
MHz

(1/2


3.84
MHz)

3.84 MHz

7.68 MHz

(2


3.84 MHz)

15.36
MHz

(4


3.84
MHz)

23.04
MHz

(6


3.84
MHz)

30.72
MHz

(8


3.84
MHz)

FFT size

128

256

512

1024

1536

2048

Number of occupied

sub
-
carriers
†, ††

76

1
51

301

601

901

1201

Number of

OFDM symbols

per
Timeslot

(Short/Long CP)

9
/
8

CP length
(μs/samples)

Short

7.29
/14

7.29
/28

7.29
/
56

7.29
/
112

7.29
/
168

7.29
/
224

Long

16.67
/
32

16.67
/64

16.67
/128

16.67
/25
6

16.67
/38
4

16.67
/51
2

Timeslot Interval (samples)

Short

18

36

72

144

216

288

Long

16

32

64

128

192

256

GSC:
Standardization Advancing Global
Communications

3GPP LTE and SAE


Further agreement on LTE


Currently no more macro
-
diversity


No soft handover required


Security


Control Plane


Ciphering and Integrity provided by eNode B (BTS)


RLC and MAC provided directly in the eNode B


User plane


Ciphering and integrity in the eAccessGateway
functionality

GSC:
Standardization Advancing Global
Communications

3GPP LTE and SAE


SAE


Looking at the implications for the overall
architecture resulting from:


3GPP’s (Radio Access Network) LTE work


3GPP All
-
IP Network specification (TS22.978)


the need to support mobility between
heterogeneous access networks


GSC:
Standardization Advancing Global
Communications

3GPP LTE and SAE


SAE


Achieving mobility within the Evolved Access System


Implications of using the evolved access system on existing and new
frequency bands

Adding support for non
-
3GPP access systems


Inter
-
system Mobility with the Evolved Access System


Roaming issues, including identifying the roaming interfaces


Inter
-
access
-
system mobility


Policy Control & Charging


How does User Equipment discover Access Systems and
corresponding radio cells? Implications of various solutions on User
Equipment, e.g. on battery life


Implications for seamless coverage with diverse Access Systems


Migration scenarios


GSC:
Standardization Advancing Global
Communications


S
5b

Evolved Packet Core

WLAN

3GPP IP Access

S2

non 3GPP

IP Access

S2

IASA

S
5a

SAE
A
nchor

3GPP
A
nchor

S4

SGi

Evolved
RAN

S1

Op.

IP

Serv.

(IMS,

PSS,

etc…)

Rx+

GERAN

UTRAN

Gb

Iu

S3

MME

UPE

HSS

PCRF

S7

S6

* Color coding:

red
indicates n
ew functional element / interface

SGSN

GPRS Core

3GPP LTE and SAE Architecture (work in progress)

GSC:
Standardization Advancing Global
Communications

3GPP LTE and SAE


In the Core network:


In addition to IMS services available in the current
system, equivalent CS Services may be provided by
IMS core since CS domain is not supported in LTE


Mobility Management Entity and User Plan Entity
might be collocated in the Access Gateway entity but
this is still an open point


Reduced number of nodes in the evolved packet core
may be achieved compared to current architecture to
provide connectivity to IMS

GSC:
Standardization Advancing Global
Communications

3GPP LTE and SAE


Recent addition to the 3GPP Work plan


During the last meetings a new study has been
initiated to work on evolution of HSPA called HSPA+
looking a further improvement of the HSPA (HSDPA
and HSUPA) and potentially being connected to the
SAE.


This could re
-
use most of the work underway in LTE
in terms of improvement for latency (protocol
evolution and functional split, but has constraints in
terms of support for legacy terminals and HW
changes).


The feasibility is first under investigation