Transcript 3GPP Long Term Evolution and System Architecture - Docbox

SOURCE:
ETSI
TITLE:
3GPP LTE and SAE
AGENDA ITEM:
Joint 4.1
CONTACT:
[email protected]
GSC11/Joint(06)32
3GPP Long Term Evolution and
System Architecture Evolution
(LTE and SAE)
Francois Courau
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 (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
Less than 50msec
Dormant
(Cell_PCH)
Active
(Cell_DCH)
Less than 100msec
– User-plane
Camped-state
(idle)
• 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
GSC: Standardization Advancing Global
Communications
3GPP LTE and SAE
• Status of the work for LTE
– Downlink Parameter for OFDM
1.25 MHz
2.5 MHz
5 MHz
10 MHz
15 MHz
20 MHz
Transmission BW
Sub-frame duration
0.5 ms
Sub-carrier spacing
15 kHz
Sampling frequency
1.92 MHz
3.84 MHz
(1/2  3.84 MHz)
7.68 MHz
15.36 MHz
23.04 MHz
30.72 MHz
(2  3.84 MHz)
(4  3.84 MHz)
(6  3.84 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)
CP
length
7/6
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)
(μs/samples)
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
Timeslot duration
0.675 ms
Sub-carrier spacing
15 kHz
Sampling frequency
1.92
MHz
3.84 MHz
7.68 MHz
(2  3.84 MHz)
(1/2  3.84
MHz)
10 MHz
15 MHz
20 MHz
15.36
MHz
23.04
MHz
30.72
MHz
(4  3.84
MHz)
(6  3.84
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 Timeslot
(Short/Long CP)
CP length (μs/samples)
Timeslot Interval (samples)
9/8
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
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
– Will the Evolved RAN need to be connected to the legacy PS core?
– 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
GSC: Standardization Advancing Global
Communications
3GPP LTE and SAE
• SAE architecture
GERAN
Gb
Iu
GPRS Core
PCRF
UTRAN
Rx+
S7
S3
S4
HSS
S6
Evolved RAN
S1
MME
UPE
S5
Inter AS
Anchor
Evolved Packet Core
MME – Mobility Management Entity
UPE – User Plane Entity
AS – Access System
Red indicates new functional element / interface
S2
non 3GPP
IP Access
Gi
Op.
IP
Serv.
(IMS,
PSS,
etc…)
S2
WLAN
3GPP IP Access
GSC: Standardization Advancing Global
Communications
* Color coding: red indicates new functional element / interface
From TR 23.882
3GPP LTE and SAE
• In the Core network:
– Services are provided by IMS core
– One node to provide the SGSN and GGSN
functionality
– Mobility Management Entity and User Plan
Entity might be collocated in the Access
Gateway entity but this is still an open point
– Full architecture provided with two nodes 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). The feasibility isy
first under investigation
GSC: Standardization Advancing Global
Communications