Transcript On the road with 3GPP

Update on the Evolution of the GERAN
Family of Standards (GSM, GPRS,
EDGE)
Jacques ACHARD
TSG GERAN Chairman
[email protected]
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Specifying GERAN Evolutions
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4
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What is TSG GERAN ?
An overview of Release 99 to Release 6
Release 7
Release 8
For more information on GERAN
Conclusion
Appendix: list of acronyms
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What is TSG GERAN ?
• TSG GERAN Objectives:
– GERAN = GSM/EDGE Radio Access Network
– Responsible for the specification of the radio aspects of the
GSM/EDGE technologies and their evolutions:
• Brought under 3GPP in 2000.
• Formerly known as ETSI SMG2.
• TSG GERAN Organization:
– Three subgroups:
• Working Group 1: Radio Aspects (and BTS testing);
• Working Group 2: Protocol Aspects;
• Working Group 3: Terminal Testing.
– Around 120 delegates.
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TSG GERAN in 3GPP organization
Project Co-ordination Group
(PCG)
TSG GERAN
GSM EDGE
Radio Access Network
GERAN WG1
Radio Aspects
TSG RAN
Radio Access Networks
RAN WG1
Radio Layer 1
specification
GERAN WG2
Protocol Aspects
GERAN WG3
Terminal Testing
RAN WG2
TSG SA
Services &
System Aspects
SA WG1
Services
TSG CT
Core Network
& Terminals
CT WG1 (ex CN1)
MM/CC/SM (lu)
SA WG2
Radio Layer2 spec &
Radio Layer3 RR spec
Architecture
RAN WG3
SA WG3
CT WG3 (ex CN3)
RAN WG4
SA WG4
CT WG4 (ex CN4)
SA WG5
CT WG5 (ex CN5)
lub spec lur spec lu spec &
UTRAN O&M requirements
Radio Performance &
Protocol Aspects
RAN WG5 (ex T1)
Mobile Terminal
Conformance Testing
Security
Codec
Telecom Management
Interworking with
External Networks
MAP/GTP/BCH/SS
OSA
Open Service Access
CT WG6 (ex T3)
Smart Card
Application Aspects
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An overview of R’99 to Rel-6
Frequency bands
Common to CS
and PS
R’99
GSM 450/480
DTM
CS
EDGE ECSD
PS
EDGE EGPRS
Rel-4
GSM 750
Rel-5
GERAN Iu mode
Intra BSC NACC
Delayed TBF
release
Gb over IP
8-PSK NB AMR
HR
WB-AMR
EPC
A flex.
Inter BSC NACC
PFC-based flow
control
LCS over
(E)GPRS
Gb flex.
Rel-6
TAPS bands
GAN
SAIC (DARP
Phase I)
U-TDOA
MBMS
MTBF
PS HO
Improvements for
streaming
services
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Release 7 (main features)
• Lower 700 MHz inclusion in the GERAN specifications a.k.a.
GSM 710:
• uplink: 728-746 MHz; downlink: 698-716 MHz (note: DL and UL
recently reversed)
• Addition of new frequency band to GSM (T-GSM810):
• uplink: 806-821 MHz; downlink: 851-866 MHz.
• A-GNSS:
• introduces Assisted Galileo in addition to Assisted GPS;
• made in a generic way to allow quick introduction of other satellite
constellations in the future.
• A-GPS minimum performance:
• specifies a minimum performance for the GPS receiver embedded in
mobile stations using A-GPS over GERAN.
• Enhancements of VGCS for public security officials (e.g.,
police, fire brigade, using "public" GSM networks):
• end-to-end ciphering;
• SMS over VGCS;
• emergency handling.
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Release 7 (main features)
•
A interface control plane signalling over IP:
• A interface signalling over M3UA/SCTP/IP.
•
DTM handover:
• allows simultaneous handover of CS and PS resources for a given end-user.
•
PS Handover between GERAN/UTRAN mode and GAN mode:
• complements the Rel-6 GAN with PS handovers between the unlicensed radio
link and GSM/UMTS for improved service continuity (e.g., when leaving home).
•
MS Receive Diversity (a.k.a. DARP Phase II):
• improved downlink performance (quality and spectral efficiency) via use of dual
antenna terminals.
•
Downlink Dual Carrier:
• support of simultaneous transmissions to a given user over two independent GSM
carriers on the downlink, enabling to double the downlink throughput for this user.
•
Latency Reductions:
• reduces terminal to network round-trip time through the use of two techniques:
– fact ack/nack reporting;
– reduced Transmission Time Interval (RTTI = 10 ms instead of 20 ms).
• paves the way for support of VoIP over GERAN
• better support of delay-sensitive "conversational" type of applications
• improves throughput of TCP-based applications due to the reduction of the roundtrip time.
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Release 7 (main features)
• EGPRS2 UL:
• addition of QPSK, 16-QAM, 32-QAM and higher symbol rate in
uplink
• comes in two flavours:
– version A (EGPRS2-A UL): GMSK, 8-PSK, 16-QAM, legacy
symbol rate 271 ksymbols/s;
– version B (EGPRS2-B UL): GMSK, QPSK, 16-QAM and 32-QAM,
higher symbol rate 325 ksymbols/s.
• EGPRS2 DL:
• introduction of QPSK, 16-QAM, 32-QAM, higher symbol rate
and turbo coding in downlink
• comes in two flavours:
– version A (EGPRS2-A DL): GMSK, 8-PSK, 16-QAM, 32-QAM,
turbo codes, legacy symbol rate 271 ksymbols/s;
– version B (EGPRS2-B DL): GMSK, QPSK, 16-QAM, 32-QAM,
turbo codes, higher symbol rate 325 ksymbols/s.
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Rel-7: Focus on EGPRS2 DL
EGPRS2-A DL
– GMSK, 8PSK, 16 QAM, 32 QAM,
– Legacy symbol rate 271 ksamples/s
– Modulation and Coding Schemes :
• legacy MCS-1 to MCS-4 from
EGPRS (GMSK)
• new DAS-5 to DAS-12
(8PSK, 16QAM, 32QAM with turbo
codes) *
EGPRS2-B DL
– GMSK, QPSK, 16-QAM, 32-QAM
– Higher Symbol Rate (325 ksymbols/s)
– Modulation and Coding Schemes:
• legacy MCS-1 to MCS-4 from
EGPRS (GMSK)
• new DBS-5 to DBS-12 (QPSK, 16QAM, 32-QAM with turbo codes)
**
Max throughput per TS : 98 kbit/s
Data throughput per timeslot
EGPRS2-A DL
100
80
EDGE
60
40
GPRS
20
0
0
5
10 15 20 25 30 35 40 45
Max throughput per TS : 120 kbit/s
* (MCS-7, MCS-8 also possible in certain conditions)
** (MCS-6 to MCS-9, DAS-5, DAS-6, DAS-9, DAS-10pad,
DAS-11, DAS-12pad also possible in certain conditions)
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Rel-7: Focus on EGPRS2 UL
EGPRS2-A UL :
– GMSK, 8PSK, 16QAM
– Legacy symbol rate 271 ksamples/s
– Modulation and Coding Schemes :
• reuse legacy MCS-1 to MCS-6 from
EGPRS (GMSK & 8-PSK)
• new UAS-7 to UAS-11 (16 QAM)
Max throughput per TS : 81.6 kbit/s
100
EGPRS2-A UL
80
EDGE
60
40
GPRS
20
0
0
EGPRS2-B UL :
– GMSK, QPSK, 16QAM, 32QAM
– Higher Symbol Rate 325 ksamples/s
– Modulation and Coding Schemes:
• reuse legacy MCS-1 to MCS-4 from
EGPRS (GMSK)
• new UBS-5 to UBS-12 (QPSK,
16QAM, 32QAM)
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10 15 20 25 30 35 40 45
C/I
Max throughput per TS : 118 kbit/s
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Rel-7: Reaching 1 Mbit/s/user
Bringing broadband to GSM
• Downlink Max
• Uplink Max
80-120 kbit/s/TS
100-120 kbit/s/TS
x 4 multislot
class 12
x 5 multislot
class 33
x2
320-480 kbit/s
Downlink
Dual carrier
1-1.2 Mbit/s
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Release 8 (main features)
• GERAN-LTE interworking:
• defines cell reselection and CS/PS handover between GERAN and
LTE.
• Multi-carrier BTS:
• through the relaxation of certain GSM BTS radio requirements, allows
to convey several GSM carriers with a single wideband transceiver, in
order to bring capex and opex savings to the operators.
• Feasibility study on MUROS (Multi-User Reusing One Slot):
• aim is to double voice capacity of GERAN per BTS transceiver by
sharing a single timeslot between up to 4 users;
• Feasibility study on Optimized Transmit Pulse Shape for
downlink EGPRS2-B:
• analysis of a wider BTS transmit mask to further increase throughputs
of EGPRS2-B downlink whilst checking potential impact on legacy
bearers using legacy terminals.
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Release 8 (main features)
•
A interface over IP:
• support of A over IP (after support of Gb over IP in Rel-4);
• allows to move the transcoders from the BSS to the Core Network (MGWs),
allowing capex and opex savings for the operators.
•
GAN enhancements (GAN Iu mode):
• allows to connect the GANC to 3G Core Networks via the Iu interface.
•
Enhancements for VGCS Applications:
• allows to send/receive a small amount of data to/from group members;
• allows to transfer critical data within 500 ms without impacting voice quality of the
group call;
• gathers information on the identity of current listeners in the group call.
•
U-TDOA enhancements:
• allows the MS to be powered at maximum power during the (brief) location
procedure, in order to improve location accuracy.
•
A-GNSS performance and testing procedures:
• specifies a minimum performance for the Galileo receiver embedded in mobile
stations using A-GNSS over GERAN and defines a test framework for terminals
that could be extended to the support of other constellations.
•
Additional Navigation Satellite Systems (ANSS) for LCS:
• complements the GPS and Galileo constellations with other constellations like
GLONASS, modernized GPS, QZSS, Satellite Based Augmentation Systems…
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Rel-8: Focus on MCBTS
• Purpose: allow GSM multicarrier transceiver architectures in
order to:
– reduce capex/opex for operators (several GSM carriers per
transceiver);
– ease migration from GSM to UMTS and or LTE (multicarrier
wideband architectures allow multistandard transceivers).
• Work started in 3GPP TSG GERAN in September 2006,
completed in August 2008.
• Relaxations of BTS requirements on intermodulation, spurious
emissions and blocking had to be introduced in the standards in
order to allow the multicarrier architectures.
• System simulations have shown that these relaxations can be
introduced w/o reduction in system performance of GSM
networks.
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Rel-8: Focus on MUROS
•
Purpose: double the HW capacity of transceivers for CS speech by
allowing 2 users (FR) or 4 users (HR) to share a single TS:
– would bring CAPEX reduction in very densely populated areas where CS
speech is the dominant service;
– could allow operators migrating some of their GSM frequencies to
UMTS/LTE to partly recover lost GSM capacity.
•
Several candidate techniques are currently under evaluation in the
context of the MUROS Feasibility Study:
–
–
–
–
•
•
•
Orthogonal Sub-Channel (OSC);
Adaptive Symbol Constellation;
Co-TCH;
Higher Order Modulations (HOM).
All techniques in UL, except HOM, can be seen as variants of MUMIMO.
Preliminary simulation results on one of the candidate techniques show
capacity gains over HR and AMR HR for network configurations with
high reuse factor and capacity losses for network configurations with
low reuse factor.
A Work Item is likely to be started soon to standardize the selected
candidate technique(s).
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Rel-8: Focus on A over IP (1/3)
• Short description:
– introduce IP transport over the A interface user plane between BSS
and Core Network.
• Performance gains:
– bandwidth savings (OPEX savings) over the A interface because 64
kbit/s A or μ law speech can be replaced by any compressed GSM
speech format (e.g., AMR);
– overall reduction in network processing power (CAPEX savings)
since transcoders can be suppressed in the BSS and maintained
only in the MGW.
• Deployment scenario and applicability:
– CAPEX and OPEX reductions for operators involved in IP
transformation of their networks (NGN).
• Current status in 3GPP:
– Specification work close to completion.
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Rel-8: Focus on A over IP (2/3)
BSS
BSS
Nc
MSC-S
MSC-S
A (IP or
TDM)
A (IP or
TDM)
Mc/IP
Mc/IP
TRAU
A/TDM
= Signalling
= User plane
MGW
Nb
TRAU
MGW
A/TDM
= Transcoder
Current legacy architecture (A over TDM)
(excerpt from 3GPP TR 43.903 v. 8.1.0.)
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Rel-8: Focus on A over IP (3/3)
A/IP
MSC-S
BSS
Mc/IP
A/IP
= Signalling
= User plane
Nc
MGW
MSC-S
A/IP
BSS
Mc/IP
Nb
MGW
A/IP
e.g. AMR coded
e.g. AMR coded
IP based
protocol
stack
IP based
protocol
stack
= Transcoder or Transcoder-pair, typically not used in MS-to MS calls
Architecture for compressed speech over IP, with transcoder-less BSS
(excerpt from 3GPP TR 43.903 v. 8.1.0.)
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For more information on GERAN
• 3GPP TSG GERAN specifications are in the 4x.xxx and 5x.xxx
series of 3GPP specifications.
• All are freely available and downloadable at:
http://www.3gpp.org/ftp/Specs/
• You can also mail [email protected] for additional questions.
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Conclusion (1/2)
• The GSM radio interface has been evolving over the
past years and keeps evolving to bring a host of
additional features attractive to both operators and
subscribers.
• Evolution is mainly towards:
–
–
–
–
more frequency bands;
support of (additional) location techniques;
higher throughputs;
higher capacities (improved spectral efficiency and hardware
efficiency);
– interworking with other access technologies;
– support of IP-based interfaces.
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Conclusion (2/2)
• This further increases GSM/GERAN attractiveness be it
used:
– for standalone networks;
– for networks used in conjunction with other radio access
technologies (UMTS, LTE...) to provide global coverage whilst
allowing excellent service continuity;
– as a futureproof platform providing a smooth migration path
towards other 3GPP based systems (UMTS, LTE).
GSM is still an incredibly alive and fast evolving standards !
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Appendix: list of acronyms (1/3)
a.k.a: also known as
ANSS: Additional Navigation Satellite Systems
A-GNSS: Advanced Global Navigation Satellite System
A-GPS: Assisted GPS
AMR: Adaptive Multi Rate
BSC: Base Station Controller
BSS: Base Station Sub-system
BTS: Base Transceiver Station
CAPEX: Capital Expenditure
CS: Circuit-Switched
DARP: Downlink Advanced Receiver Performance
DL: Downlink
DTM: Dual Transfer Mode
ECSD: Enhanced Circuit Switched Data
EDGE: Enhanced Data rates for GSM Evolution
EGPRS: Enhanced General Packet Radio Service
EPC: Enhanced Power Control
FR: Full Rate
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Appendix: list of acronyms (2/3)
GAN: Generic Access Network
GANC: GAN Controller
GERAN: GSM and EDGE Radio Access Network
GLONASS: ГЛОНАСС: ГЛОбальная НАвигационная Спутниковая Система
GMSK: Gaussian Minimum Shift Keying
GPS: Global Positioning System
HR: Half Rate
HO: Handover
HW: Hardware
LCS: Location Services
M3UA: MTP Level 3 User Adaptation layer
MCBTS: Multi-carrier Base Transceiver Station
MBMS: Multimedia Broadcast and Multicast Service
MGW: Media Gateway
MIMO: Multiple Inputs Multiple Outputs
MSC: Mobile Switching Centre
MSC-S: MSC Server
MTBF: Multiple TBF
MTP: Message Transfer Part
MU-MIMO: Multi-User MIMO
MUROS: Multi-User Reusing One Slot
NACC: Network Assisted Cell Change
NB: Narrowband
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Appendix: list of acronyms (3/3)
OPEX: Operational Expenditure
PFC: Packet Flow Context
PS: Packet-Switched
PSK: Phase Shift Keying
QAM: Quadrature Amplitude Modulation
QPSK: Quadrature Phase Shift Keying
QZSS: Quasi-Zenith Satellite System
RTTI: Reduced Transmission Time Interval
SAIC: Single Antenna Interference Cancellation
SCTP: Stream Control Transport Protocol
SMS: Short Message Service
TAPS: TETRA Advanced Packet Service
TBF: Temporary Block Flow
TCP: Transmission Control Protocol
TRAU: Transcoding and Rate Adaptation Unit
TS: Time slot
UL: Uplink
U-TDOA: Uplink Time Difference Of Arrival
VGCS: Voice Group Call Service
VoIP: Voice over IP
WB: Wideband
w/o: without
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