egprs2 que soporta el expb

7/28/2019 EGPRS2 Que Soporta El EXPB

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1

Update on the Evolution of the GERAN

Family of Standards (GSM, GPRS,

EDGE)

Jacques ACHARD

TSG GERAN Chairman

[email protected]



2

Specifying GERAN Evolutions

1 What is TSG GERAN ?

2 An overview of Release 99 to Release 6

3 Release 74 Release 8

5 For more information on GERAN

6 Conclusion

7 Appendix: list of acronyms



3

1 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.



4

TSG GERAN in 3GPP organizationProject Co-ordination Group

(PCG)

TSG RANRadio Access Networks

RAN WG1Radio Layer 1specification

RAN WG2Radio Layer2 spec &

Radio Layer3 RR spec

RAN WG3lub spec lur spec lu spec &

UTRAN O&M requirements

RAN WG4Radio Performance &

Protocol Aspects

RAN WG5 (ex T1)Mobile Terminal

Conformance Testing

TSG SAServices &

System Aspects

SA WG1Services

SA WG2Architecture

SA WG3Security

SA WG4Codec

SA WG5Telecom Management

TSG CTCore Network& Terminals

CT WG1 (ex CN1)MM/CC/SM (lu)

CT WG3 (ex CN3)Interworking withExternal Networks

CT WG4 (ex CN4)MAP/GTP/BCH/SS

CT WG5 (ex CN5)OSA

Open Service Access

CT WG6 (ex T3)Smart Card

Application Aspects

TSG GERANGSM EDGE

Radio Access Network

GERAN WG1Radio Aspects

GERAN WG2Protocol Aspects

GERAN WG3Terminal Testing

GERAN WG3Terminal Testing



5

2 An overview of R’99 to Rel-6

R’99 Rel-4 Rel-5 Rel-6

Frequency bands GSM 450/480 GSM 750 TAPS bands

Common to CSand PS

DTM GERAN Iu mode GANSAIC (DARP

Phase I)

U-TDOACS EDGE ECSD 8-PSK NB AMR

HRWB-AMR

EPC A flex.

PS EDGE EGPRS Intra BSC NACCDelayed TBF

releaseGb over IP

Inter BSC NACCPFC-based flow

controlLCS over (E)GPRSGb flex.

MBMSMTBF

PS HOImprovements for

streamingservices



6

3 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 ULrecently 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 satelliteconstellations 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.




• 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 dualantenna 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 round-trip time.




• 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.



3 Rel-7: Focus on EGPRS2 DLEGPRS2-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 turbocodes) * 0

20

40

60

80

100

0 5 10 15 2 0 25 30 35 4 0 45

GPRS

EDGE

EGPRS2-A DLData throughput per timeslot

Max throughput per TS : 98 kbit/s

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, 16-

QAM, 32-QAM with turbo codes)

**


* (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)



3 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

0

20

40

60

80

100

0 5 10 15 20 25 3 0 35 40 4 5C/I

GPRS

EDGE

EGPRS2-A UL

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)




3 Rel-7: Reaching 1 Mbit/s/user

Bringing broadband to GSM• Downlink Max

x 5 multislotclass 33

x 2

Downlink

Dual carrier

• Uplink Max

x 4 multislotclass 12

100-120 kbit/s/TS 80-120 kbit/s/TS

1-1.2 Mbit/s

320-480 kbit/s




• 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.




• 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 thegroup 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 mobilestations using A-GNSS over GERAN and defines a test framework for terminalsthat 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…



4 Rel-8: Focus on MCBTS

• Purpose: allow GSM multicarrier transceiver architectures inorder 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.



4 Rel-8: Focus on MUROS

• Purpose: double the HW capacity of transceivers for CS speech byallowing 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 toUMTS/LTE to partly recover lost GSM capacity.

• Several candidate techniques are currently under evaluation in thecontext 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 MU-MIMO.

• Preliminary simulation results on one of the candidate techniques showcapacity gains over HR and AMR HR for network configurations withhigh reuse factor and capacity losses for network configurations withlow reuse factor.

• A Work Item is likely to be started soon to standardize the selectedcandidate technique(s).



16

4 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 because64 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 maintainedonly 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.



17


MSC-S

MGW

BSS

A (IP or

TDM)Mc/IP

MSC-S

MGW

Mc/IP

Nb

Nc

A/TDM A/TDM

= Signalling

= User plane

A (IP or

TDM)

TRAU

BSS

TRAU

= Transcoder

Current legacy architecture (A over TDM)

(excerpt from 3GPP TR 43.903 v. 8.1.0.)



18


MSC-S

MGW

BSS

A/IP

Mc/IP

MSC-S

MGW

Mc/IP

Nb

Nc

A/IP A/IP

A/IP

e.g. AMR coded

IP based

protocol

stack

e.g. AMR coded

IP based

protocol

stack

BSS

= Transcoder or Transcoder-pair, typically not used in MS-to MS calls= Signalling

= User plane

Architecture for compressed speech over IP, with transcoder-less BSS

(excerpt from 3GPP TR 43.903 v. 8.1.0.)



19

• 3GPP TSG GERAN specifications are in the 4x.xxx and 5x.xxxseries 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.

5 For more information on GERAN



20

6 Conclusion (1/2)

• The GSM radio interface has been evolving over thepast 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.



21

6 Conclusion (2/2)

• This further increases GSM/GERAN attractiveness be itused:

– 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 !



22

7 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 StationCAPEX: 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 EvolutionEGPRS: Enhanced General Packet Radio Service

EPC: Enhanced Power Control

FR: Full Rate



23


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 MIMOMUROS: Multi-User Reusing One Slot

NACC: Network Assisted Cell Change

NB: Narrowband



24


OPEX: Operational Expenditure

PFC: Packet Flow ContextPS: 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 ServiceTAPS: 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 IPWB: Wideband

w/o: without

egprs2 que soporta el expb

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