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HUAWEI TECHNOLOGIES CO., LTD. Page 1
SyncEandPTPUpdateThePast,thePresentandtheFuture
MichaelMayerSeniorStaffEngineer
HuaweiCanadaResearchCentreISTF2016,Prague,November2016
HUAWEI TECHNOLOGIES CO., LTD. Page 2
ObjecJveandoutline• ObjecJve:
– ToprovideanupdateonthestateofSynchronousEthernet(SyncE)andIEEE1588(PTP)technologies,keycomponentsinnextgeneraJonsynchronizaJon
– Focusisontelecom(duetoJmelimitaJons)• Outline:
– Technologiesreview:Whattheyareandtheoriginaldrivers– Recentdevelopments– ExampleoffutureapplicaJonareas(e.g.5G)
HUAWEI TECHNOLOGIES CO., LTD. Page 4
SyncE:Whywasitdeveloped
SyncE
NetworkstransiJoning
(TDMtoPacket)
ServicestransiJoning(E1toEthernet)
SyncNetworkMigraJonpath
(whataZerSDH?)
TDMoverPacketstomaintainsomeexisJng
services(howtoJmetheIWF)
WirelessbackhaulevoluJon
(E1toEthernet)
EthernetPHYbecameobviouschoiceforSyncnetworkevoluJon
HUAWEI TECHNOLOGIES CO., LTD. Page 5
SyncEconceptandcomponents
IniJalapplicaJons:– ProvidingJmingtoCircuitEmulaJon– GeneralnetworkJmingdistribuJon– Timingtowirelessbackhaul
HUAWEI TECHNOLOGIES CO., LTD. Page 6
SyncEconceptandcomponents
• Clocks:EEC1andEEC2• EEC1:basedonG.813OpJon1(SEC)• EEC2:basedonG.812TypeIV/G.812OpJon2(Stratum3)
• NetworkElementfuncJons:• EthernetSynchronizaJonMessagingChannel(ESMC)• G.781protecJon
IdealtomigratefromSDH,butnewservicesneedphase/Jme
HUAWEI TECHNOLOGIES CO., LTD. Page 7
IEEE1588/PTP• IEEE1588:StandardforAPrecisionClockSynchronizaJonProtocol
forNetworkedMeasurementandControlSystems – DevelopedbytheIEEEforuseintheindustrialautomaJonsectorto
defineasystemfordistribuJngaccurateJme/phaseinapacketbasednetworkenvironment.(NTPinsufficient)
• Viewedasanidealwaytosupportfrequency/phase/Jme• IEEE1588(2008),“Version2”,definedcapabiliJestoallowtelecom
applicaJon– Profilemechanism– Specialtyclocks(BoundaryandTransparent)– ButsJllmoreneeded…
HUAWEI TECHNOLOGIES CO., LTD. Page 8
ITU-Tdefinedtelecomprofiles• MulJpleprofilesdeveloped
– Frequencyonly– Frequency,phaseandJme
• Withfullnetworksupport(allnetworkelementsoperateasboundaryclocks)• WithParJalsupport(notallnetworkneedtobeboundaryclocks)
• DefinedinITU-TRecommendaJons– G.8265.1(Frequency)– G.8275.1(Frequency/phase/Jmewithfullsupport)– G.8275.2(Frequency/phase/JmewithparJalJmingsupport)<recent
MulJpleprofilesaddressdifferentnetworkarchitectures
HUAWEI TECHNOLOGIES CO., LTD. Page 9
SyncEandPTPworktogether(T-BC)
PTP
SyncE
TelecomBoundaryClock(T-BC)
HUAWEI TECHNOLOGIES CO., LTD. Page 11
Recentdevelopments:SyncE• Clocks:Newclocksbeingdeveloped
– EnhancedEthernetEquipmentClock(e-EEC)– Improvedperformance(holdover,noise,transient)
• ESMCenhancements– NewcontenttobecarriedinESMCtoprovidecapabiliJessuchashopcounttoenablebeiercontrolofnetworkperformance
HUAWEI TECHNOLOGIES CO., LTD. Page 13
Recentdevelopments:IEEE1588• OngoingworkbyIEEEtodevelopnextversion• ParJalJmingsupportprofile(G.8275.2)published
• BoundaryclockspecificaJonpublished• OngoingworkonEnhancedPRTC• DevelopmentofPTPoverOTN
HUAWEI TECHNOLOGIES CO., LTD. Page 15
SynchronizaJon:5Gnetworks• SyncEandPTPweredevelopedtosupportevolvingwirelessbackhaul
needs– SynchronizaJonnetworkexpectedtosupportconJnuedevoluJonto5G
• 5Gnetworkswill:– Supportnewservices:
• IoT,SensorNetworks,tacJleinternet– Providehigherperformance:
• Higherbitrates,higherspeedmobilityhandoff,lowerlatency– Newdeploymentcases:
• HigherconnecJondensiJes,newspectrumallocaJon,useofunlicensedspectrum– NewRadioAccessNetwork(RAN)architectures
ArechangesneededtosynchronizaJonnetworkcapabiliJes?
HUAWEI TECHNOLOGIES CO., LTD. Page 16
Capabilitydeltaagainstcurrent5Grealizedby:
• Peakdatarate:NewspectrumallocaHon
• Userdatarate:CoMP,MIMO
• Spectrumefficiency:ModulaHon
• Mobility:Fasterhand-offcapability(CRAN)• Latency:Movementofservicedatabases
• ConnecHondensity:CRANarchitecture• Networkenergy:CRANarchitecture• Areatrafficcapacity:CRAN/CoMP/MIMO
M.2083-03
User experienceddata rate(Mbit/s)
100
Spectrumefficiency
IMT-2020
3×
500
1106
10
20
100×Mobility(km/h)
Latency(ms)
Connection density(devices/km )
2
Networkenergy efficiency
Area trafficcapacity
(Mbit/s/m )2
Peak data rate(Gbit/s)
10
1×
400350
10105
10×1×
10.1
1
IMT-advanced
Figure:ITU-RM.2083
HUAWEI TECHNOLOGIES CO., LTD. Page 17
SynchronizaJonrequirements?• SynchronizaJonrequirementswillbebasedbothserviceneedsandtheneedsoftheinfrastructure– Serviceneeds:
• M2M,IoTmayrequireaccuratesynchronizaJon,whichmayormaynotbeprovidedbythenetwork
– Infrastructureneeds:• Newairinterfacesmaybedefined• NewcapabiliJesrelatedtoJme-sensiJvenetworksmaybeneededandmayrequiresynchronizaJonsupportfromthenetwork
HUAWEI TECHNOLOGIES CO., LTD. Page 18
Airinterfaceismorecomplex• ExisJngsyncnetworkbasedonTDMsliprateobjecJves,
requiringcontrolofpointeradjustmentsinSDH• Airinterfaceismorecomplex:OFDMsymbols
(subcarriers)arerepresentedbyresourceblocksinaframestructure.(FDDshown)
• InthecaseofMIMO,eachantennawillhaveaframestructure.
• WheremulJpleantennassharethesamesystemclock,usuallynotanissue.
• CoMPorCarrierAggregaJonmayneedsomeassistancewhereantennasaredrivenbydifferentoscillators.
Sub-Carrier
eNodeB
UE
HUAWEI TECHNOLOGIES CO., LTD. Page 20
5G:Newarchitecturalcomponents• CentralizaJonoffuncJonsandtheuseofdatacentretechniquesareseenaskeytosupporJng5Grequirements
• Architecture:– C-RAN(Cloud-RAN,Centralized-RAN)
• LocalizesthefuncJonstoallowsharingofresources– Networkslicing
• Controllinghowtheend-to-endnetworkissharedbetweendifferentuser(groups)toachievedifferentnetworkobjecJves
• InvolvesaspectsofvirtualizaJonandorchestraJon
HUAWEI TECHNOLOGIES CO., LTD. Page 21
Theevolvingbase-staJonmodel
eNodeBS1
UE(phone)
Airinterface(frequency,jiier)
Control
Data+Jming
“Backhaul”
StarJngpoint
UE(phone)
RERECS1Data+Jming
“Fronthaul”
SeparateantennaFromeNodeB(e.g.CPRIlink)
Airinterface
InpracHce,anetworkmayhavehundredsorthousandsofbasestaHons.ArethereanyefficienciesthatcanbegainedbycentralizingsomefuncHons?
HUAWEI TECHNOLOGIES CO., LTD. Page 22
C-RAN
• C-RAN:– LocalizefuncHonsassociatedwithradiobaseStaHoncontrolwiththegoalofachievingstaHsHcalgains.– Datacentremodel– AllowsHghtercontroloflatencyandsynchronizaHoninthecaseofdistributedMIMO,orCA,wherenormally
separatebase-staHonswouldhavebeendeployed– AboveexampleshowsHmingdistribuHonviaboundaryclocks,butotherpossibiliHesexist.– SynchronizaHonimpact:consistentwithexisHngHRMforHme/phase/frequency
Server ServerServer
PacketNetwork(e.g.Ethernet)(twolayer,
Lossy)
RadioInterface
ControlBoundaryclock(T-BC)
Networkinterface
Radiointerface
Radiointerface
Networkinterface
Antenna
Antenna
HUAWEI TECHNOLOGIES CO., LTD. Page 23
CRANexample(CMCC)
From:RecentprogressonC-RANcentralizaJonandcloudificaJon,Chih-linetal,2014
HUAWEI TECHNOLOGIES CO., LTD. Page 24
Networkslicing• 5GnetworkswillaggregatemulJpleservicesonpossiblyseparateradioaccesstechnologies– SpectrummaybesharedandneedscontrolandcoordinaJon
– NetworkslicerepresentstheporJonofallnetworkresourcesthatmaybeallocatedtoaserviceoruser.
SynchronizaJonimpact:SlicingorchestraJonneedstoconsidersynchronizaJonofairInterface.
HUAWEI TECHNOLOGIES CO., LTD. Page 25
Slicing:allocateandconnectresources
• SlicingseparatesresourceandwillenabletheCRAN• For5G,mulHpleairinterfacesneedtobeconsidered• FuncHonsforcontrolbasedonNFGandSDNtorunpacketcorefuncHonsongeneralpurposeCPUs• SynchronizaHonofbase-staHons/antennaresourcesareneededasinanyRAN• Whataspectsrelatedtosyncarerequired?
HUAWEI TECHNOLOGIES CO., LTD. Page 26
Summary• SyncEandPTParewellestablishedandofferhighlevelsofperformance• NewfuncJonalitywillofferenhancednetworkfuncJonality• Evolving5Gwirelessarchitectureandservicesmayrequirehigherperformance
fromsyncnetwork– EnhancedEECstartstoaddressperformance
• 5Gwilloffernewservicesandsupportnewtechnology.– SomeservicesmayrequireaccurateJme(e.g.locaJonaccuracy)eventhoughthe
fundamentaltransportdoesn’tneedit.– PTPnaturaltechnology
• NewCRANarchitecturesfor5GappeartobewellsupportedbycurrentsynchronizaJontechniques.
– Somefurtherworkmayberequiredtodefinecertaincomponents,slicingsupportaspectsandpotenJallynewairinterfacedefiniJons.