GPRS Day 1_b.ppt

GPRS Prsentation Speaker

Date

Customer - Date *All rights reserved 2003, Alcatel

CS3 - CS4User Data RatesCS1 : 8 kb/sCS2 : 12 kb/sCS3 : 14.4 kb/sCS4 : 20 kb/sCoding scheme adaptationRXQUAL not relevant in CS-4. New metric is used : I_Level (level of interference), defined in Rec 05.08CS-4 --> CS-3: I_levelCS-3 --> CS-4: I_Level and Rx_qualCS-2 CS-3: Rx_QualNetwork architectureOne radio timeslot is transported over two 16kb/s A-bis nibblesSame principles as for support of EDGE


CS-3/CS-4Expected radio performances on the fieldCS-3 : little gain compared to CS-2CS-4 : requires excellent radio conditionsRecommendation : CS-4 should not be activated on frequency hopping TRXIt is possible to limit the maximum GPRS Coding Scheme used in a cell through an OMC parameter


EDGEEDGE overviewEDGE in Alcatel B8Hardware supportArchitectureEDGE radio featuresResource allocationEDGE Radio performancesMarket situationEDGE HandsetsEDGE Evolution


EDGE :Enhanced Data rates for GSM EvolutionEDGE = E-GPRS + E-CSDonly E-GPRS to be consideredSame frequency spectrum as GPRS, new Modulation and Coding SchemesSame protocol architecture as for GPRSTwo modulation schemes: GMSK(Gaussian Minimum Shift Keying)8-PSK(8-Phase Shift Keying) higher bit ratesTwo classes of EDGE handsets :Class 1: GMSK and 8PSK in DL, GMSK only in ULClass 2: GMSK and 8PSK in both directions


EDGE :EDGE Modulation & Coding Schemes

CS-420CS-314.4CS-212CS-18New modulation & coding schemes (MCS)

Data rate per radio timeslotEDGE (E-GPRS)GPRS

Sheet1

SchemeModulationRate [kbps]

MCS-98PSK59.2

MCS-88PSK54.4

MCS-78PSK44.8

MCS-68PSK29.6

MCS-58PSK22.4

MCS-4GMSK17.6

MCS-3GMSK14.8

MCS-2GMSK11.2

MCS-1GMSK8.8

Sheet2

Sheet3


New Mechanisms introduced with EDGELink Adaptationto select most appropriate MCSbased on mean Bit Error Probabilitystandard deviation of BEPIncremental Redundancyoptional for BSS, mandatory in MS receiversif an error is detected by the receiver:the received message is stored,the same block is sent again, with a different Puncturing Scheme, on the same MCSthe receiver decodes the resulting message together with the previously received message


EDGE : High Spectral EfficiencyEGPRS : 2.5 up to 3 times more efficient than GPRSwhatever the frequency band : GSM 900, 1800...whatever the environment : urban, suburban,ruralwhatever the mobile velocityThroughput of GPRS and EGPRS as function of C/I




EDGE, a simple network evolutionFrom GSM CS to GPRS PS up to EDGENo Hardware upgrade with EvoliumTMCurrent Software version of EvoliumTM NSS is EDGE ready


EDGE TRX Radio PerformancesTRX Output power

Reference sensitivityMCS-1: < -111 dBmMCS-5: -108 dBmMCS-9: -99 dBmAll values given in static environment

GMSK

8-PSK

GSM 900

Medium Power

45 W

15 W

GSM 900

High Power

60 W

25 W

GSM 1800

Medium Power

35 W

12 W

GSM 1800

High Power

60 W

25 W

Micro-BTS

3 W

1.5 W


Support of EDGE in installed Evolium BTS with TREsimply plug one EvoliumTM Evolution step 2 TRX (TRA)automatic alignment of GMSK power8-PSK power untouchedTRE(35W)EDGE TRAautomatic alignment of GMSK powerone sectorGMSK :High Power : 60 W 35 WMedium Power : 45 W 35 W8-PSK : High Power TRA : 25WMedium Power TRA : 15W


EDGE in Alcatel BSSArchitecture PrinciplesThe issue :EDGE Radio characteristics : up to 59 kb/s per radio timeslotOne radio timeslot cannot be anymore transported over one 16kb/s terrestrial nibble : transport over several 16kb/s nibblesAlcatel solution :Definition of multiple classes of TRX to support high data serviceEDGE & GPRS up to CS-4The Operator defines per cell the number of TRX of each classThe higher the packet class,the higher the maximum data throughputthe higher the impact on BSS dimensioning (terrestrial interfaces, connectivity...)


EDGE architecture principle :Maximum Coding Scheme = f(TRX class)Supported Coding schemes in Evolium BTSMax 22 kb/sMax 30 kb/sMax 54 kb/sMax 59 kb/s1 radio TS =1 16kbpsnibble1 radio TS =2 nibbles1 radio TS =3 nibbles1 radio TS =4 nibbles1 radio TS =5 nibbles


EDGE - Abis mapping principle

RadioTRX1TRX2TRX3BSCell1 PDCH = 3 terrestrial nibbles = 1 main nibble, also used for voice + 2 additional nibbles, only used for packet RSLTRX1TRX2TRX3Abisone triple TRX is transported over 6 timeslots on Abis Example : one cell with one Class 3 TRX3 nibblesEDGE TRX (triple)


Abis DimensioningLarge BTS : second Abis link for support of EDGE dataSUM A is required (EvoliumTM Evolution step 1)

BTS configuration

One Abis link per BTS

Possible distribution of TRX per cell

Two Abis links per BTS

Possible distribution of TRX per cell

BTS 12 TRX

3 cells @ 4 TRX

4 simple TRX

1 class 5 + 1 double TRX + 2 simple TRX

or

1 triple + 3 double TRX

or

1 triple TRX+ 1 quad TRX +2 simple TRX

BTS 9TRX

3 cells @ 3 TRX

1 double + 2 simple TRX

2 quad TRX + 1 simple TRX

or

3 triple TRX

BTS 6TRX

3 cells @ 2 TRX

1 triple + 1 simple TRX

2 quad TRX

BTS 3 TRX

3 cells @ 1 TRX

1 class 5 TRX


Examples of Abis topologyBSCBTSEVOLIUMBTSPrimary AbisSecondary AbisPrimary AbisSecondary AbisEVOLIUMBTSBTSNo constraint about position of primary and secundary links in the BSC


BSC / MFS dimensioningBSCGlobal BSC capacity remains unchanged : 3584 (448 * 8) channels @ 16 kb/s for a conf. 6 BSCPrinciple : the higher the TRX class, the higher the BSC connectivity consumptionSimilar to Dual Rate management : 1 DR TRX ~2 FR TRX1 class 2 TRX ~ 2 FR TRX,1 class 3 TRX ~ 3 FR TRX1 class 4 TRX ~ 4 FR TRX1 class 5 TRX ~ 5 FR TRXMFS/GPUpacket data processing capacity remains unchangedup to 6 GPU per BSC


EDGE Combined features for significant performanceIncremental RedundancyCombines information from successive transmissions of same blocksDifferent puncturing scheme used for each retransmission

Link AdaptationEnables automatic adaptation of Modulation&Coding SchemesAdapts to local radio propagation conditions

Combine LA and IRSignificant improvement of radio performance


Radio Resource ManagementB7 principles for radio resource sharing are keptDynamic resource allocation between CS and PS traffic

EDGE capable TRX are not dedicated to EDGE trafficThey can be used for voice (and GPRS)

GPRS and EDGE share the same radio resourcesNo specific parameter to tune to follow EDGE MS introduction


Radio Resource ManagementIn the packet pool, new mechanisms for GPRS/EDGE combined resource managementAll packet sessions are preferably established on the highest class TRXPriority given to EDGE MS on highest class TRXImproved PDCH filling computation, which takes into account,For GPRS TBF establishment: the already established GPRS and EDGE TBFs For EDGE TBF establishment: only the established EDGE TBFsIssue: GPRS MS can not decode the USF transmitted on 8-PSKAn EDGE MS sharing radio TS with a GPRS MS, would have to be limited to GMSK (MCS-4 max.) Solution: when needed, GPRS MS are re-allocated towards timeslots without EDGE (same or other TRX)


Radio Resource ManagementExample 1Voice domainPacket domainClass 4 TRXClass 1 TRXNo PS


Radio Resource ManagementExample 1Voice domainPacket domainClass 4 TRXClass 1 TRXNo PSEDGE MS in the cellmaximum throughput for EDGE TBF (up to MCS-8)


Radio Resource ManagementExample 2Voice domainPacket domainClass 4 TRXClass 1 TRXNo PS


Radio Resource ManagementExample 2Voice domainPacket domainClass 4 TRXClass 1 TRXNo PSEDGE MS in the cellmaximum throughput for EDGE TBF (up to MCS-8)


Frequency Planning of EDGE TRXEDGE may be activated on non hopping TRXbaseband hopping TRXsynthesised radio hopping TRXTwo options for the Operatorno modification of radio planning for EDGEdedicated radio planning in order to ensure higher C/I conditions, therefore better throughputs


EDGE takes benefit of all GPRS improvementsHigh amount of improvements since GPRS introductionAccess timeQuality of serviceManagement of mobilityManagement of GPRS in hierarchical networksImprovements brought :In standardisation bodies : since 3GPP R97 In manufacturer implementationAll these improvements are immediately applied in EDGE

Go for secured EDGE introductionSince day one, get top network quality




Radio PerformancesSystem Throughput versus Distance,


EDGE Radio Performances EDGE Radio performances depend onlevel of interferencereuse factorload in the cellenvironmenturban, suburban, rural...required indoor penetrationsize of cellsintrinsic performances of receivers/transmitters


Radio PerformancesImpact of TRX classMean data throughput: 36 kb/s with class 5 TRX26 kb/s with class 3 TRXThroughput available for 90% users : 12 kb/s for both classesSuburban environment,1km cell radius,2TRE, 1TRA MPDistribution of throughput in the cellkb/s per radio TSClass 5 TRX - MP TRAClass 3 TRX- MP TRA 50


Data PerformancesImpact of TRX 8-PSK powerMean data throughput: 39 kb/s with HP TRA36 kb/s with MP TRAThroughput available for 90% users : 16 kb/s with HP TRA 12 kb/s with MP TRASuburban environment,1km cell radius,2TRE, 1TRA


EDGE HandsetsThe condition of EDGE success : EDGE terminals availabilityIn due quantity and variety Ensuring mass devices deliveryAt a fair cost

Requirements on these terminals4 radio timeslots on downlink path to offer ~130 kb/s in regular radio conditions Multi-band terminals : GSM 850, 900, 1800 & 1900 MHzMulti-mode terminals GSM/EDGE/WCDMA for combined WCDMA/EDGE launch


Inter-Operability Testing Programs

A key of success : end-to-end interoperable solutionsNeed of wide GPRS and UMTS experience and expertise in IOT

Co-operation with Philips Semiconductors already settledActivity scheduled to start in automn 2003, both in European and asian IOT centres

ALCATEL committed in IOT campaigns with EDGE chipset and stack suppliers




EDGE EvolutionContinuous process for EDGE evolution in 3GPP GERANFirst step of EDGE in Alcatel Release B8based on 3GPP R99Evolution for support of real time services3GPP R6 under definitionAlcatel active role in standardisation for EDGE evolution


EDGE by AlcatelConclusion Secure introduction of EDGE in Evolium BSSNo hardware impact on MFS, BSCEvolium BTS is EDGE readyjust plug EDGE TRX where/when neededScalable solutionImpact on dimensioning depends on EDGE trafficPowerful Radio Resource Algorithms to maximise EDGE & GPRS throughputsEDGE availability in Evolium BSSwith minimum impact on the network


B8 main telecom featuresGPRS and EDGETraffic managementNC2 Throughput and capacityCS-3 & CS-4EDGE2 incoming A-bis links per BTSPerformanceGPRS resource anticipationInstantaneous GPRS accessDL LLC PDU re-routingLCS Cell ID & TAConventional and assisted GPS2G/3G inter-operability2G to 3G cell re-selection improv.UMTS search deactivation during GPRS transferGSM improvementDynamic SDCCH allocationB8 ...GPRS and EDGETraffic managementNC2 Throughput and capacityCS-3 & CS-4EDGE2 incoming A-bis links per BTSPerformanceGPRS resource anticipationInstantaneous GPRS accessDL LLC PDU re-routing


GPRS resource anticipationDescriptionEnsure that at least one PDCH (and its corresponding GCH) remains allocated in a cell and being able toEstablish an UL EDGE TBFEstablish an UL GPRS TBF, while avoiding conflict with E-GPRS TBFsBenefitsFaster access to GPRS serviceInstantaneous GPRS establishment is possible even for the first GPRS transaction in the cell Ensured GPRS accessTo allow for the best trade-off between performance and ensured access, the feature is activated on a per cell basisThe PDCH is established on the G4 TRX of the smallest pool type (and of highest priority), to save A-ter resources


Instantaneous GPRS establishmentDescriptionWhen an UL radio resource is available, the UL TBF is immediately established, even if corresponding DL resources are not availableThe UL TBF establishment and the UL transfer duration is used to request optimal resources for a subsequent DL TBF BenefitsGPRS transactions begin beforeAverage gain: 500 msShould give the opportunity to reduce the value of PDCH Inactivity timerBetter A-ter efficiency


Instantaneous GPRS establishment

MS

BSS

Server

CHNRQ

IMM ASS UL

UL Data

PDAS

DL Data

DL Data

PTR

UL Data

Server

BSS

MS

CHNRQ

IMM ASS UL

Resource Request to BSC

Resource Request to BSC

Without Immediate UL establishment

With Immediate UL establishment

gain

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GPRS Day 1_b.ppt

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