Presentation on theme: "Evolution road of 3GPP-LTE"— Presentation transcript:
1 Evolution road of 3GPP-LTE DOCUMENT #:GSC13-PLEN-41FOR:PresentationSOURCE:Huawei Technologies Co., LtdAGENDA ITEM:Plenary; 6.1CONTACT(S):Evolution road of 3GPP-LTEHuawei Technology Co., LTDSubmission Date: July 1, 2008
2 Highlight of Current Activities (1) Developing the standard on the evolution of the 3G mobile systemThe evolution of the 3G radio-access technology towards a high-data-rate, low-latency and packet-optimized.The main work of LTE focuses on:ArchitectureeNB functionRadio interfaceBand arrangementTransmission schemeRF related requirementsMobility and RRMSONSupport of Interworking between LTE and 3GPP RAT or 3GPP2 RATCurrently focusing on LTE Stage 3 (finishing LTE Rel-8 specification)
3 Highlight of Current Activities (2) Currently specifications completion levelTransmission schemeMultiple Address（100％）Downlink: OFDMA Uplink: SC-FDMAFrame Structure （100％）Modulation（100％）Coding（100％）Physical procedure(99%)Radio interface and protocolsMAC(80%)RLC(70%)RRC(70%)Architecture and protocolsArchitecture and Interface Protocol Structure(100%)RRM(90%)O&M(100%)SON(70%)MM(99%)RF related , band arrangementRF related requirement, the requirement support of RRM (80%)LTE repeater(25%)
4 Strategic DirectionGrowing experience with the take-up of 3G is helping to clarify the likely requirements of users, operators and service providers in the longer termLTE project aims to ensure the continued competitiveness of the 3GPP technologies for the futureThe LTE standards development had been defined in the following phases:SI phase: finished at the Sep, 2006WI phase: started at the June, 2006Currently it is in Stage 3 in WI phase. It is expected to launch the first LTE commercial version standard by the end of 2008.In 2009, the work will focus on the enhancement and Improvement of LTE.
5 ChallengesLTE business development and business model need more deep consideration because of HSPA+ and Wimax.With HSPA (downlink and uplink), UTRA will remain highly competitive for several years, most of operators are deploying 3G (UMTS/HSPA) network but have little income, it will be solved firstly.LTE performance can not be satisfied by some operators. So LTE system will be continued to be improved to fulfill the operator’s different requirements.The final choice of LTE technologies is not simply technological, it may be determined ultimately by IPR issues, there isn’t a IPR solution till now.There are so many players in 3GPP which will take some difficulties to average benefit, So the schedule of LTE has been strongly delayed, It will be completed on Dec 2008.
6 Next Steps/ActionsBegin the Study Item of LTE-Advanced, It shall be an evolution of LTE.LTE terminal shall be supported in LTE-advanced networksan LTE-Advanced terminal can work in an LTE part of the networkAllow coverage ranging from Macro cells to indoor environment such as Home coveragePrimary focus of LTE-Advanced is low mobility usersSelf-configuration and optimization shall be further enhancedFeatures already supported in previous releases are a pre-requisite for being supported by LTE-advancedLTE-advanced shall support FDD and TDD mode of operation with maximum commonalityCost reductionLow cost of the infrastructure deployment and terminal for LTE-advanced shall be an essential elementPower efficiency in the infrastructure and terminal shall be an essential elementBackhauling shall minimize cost per bitMinimizing additional complexity for the terminal
9 Huawei’s activities in LTE Huawei is one of the pioneer companies who proposed the creation of LTE. We now have plenty of important proposals accepted involving in physical layer, high layer, interface and performance.Huawei is the editor of TS and TS of LTE specifications.Research view over the key issue:Downlink OFDMAIntra-cell OrthogonalityHigh spectra efficiencyUplink SC-FDMAPromising uplink multiple access scheme with higher terminal Power Amplifier efficiencySoft frequency reusesuppress the inter-cell interferenceimprove cell edge data rateMIMOHigher average throughput and spectral efficiencyMBMS on LTEEfficient Broadcast and Multicast transmission on LTE system
10 LTE: Huawei research points Downlink OFDMAFast hopping pilot patternMultiplexing frequency diversity and Multi-User diversity transmissionAMC process for DL Link AdaptationPAPR ReductionUplink SC-FDMADistributed pilot design for localized dataHARQ for ULCQI Report mechanismInter-cell Interference MitigationSoft Frequency ReuseMajor frequency with reuse factor greater than 1at cell edgeMinor frequency with reuse factor 1 in near Base StationMajor frequency bands coordinated with neighboring cellsMIMO & Transmit DiversityMU-MIMOCombination CDD (Cyclic Delay Diversity) and STTDMIMO for MBMS
11 LTE: Huawei research points RRC functionsRRC statesLocation of the Upper RRC and lower RRCRRC terminated in ENB, but some functions such as PDCP control etc. should be in aGWLTE_Active mobilityHandover method: data forwarding and bi-casting or mixed methodHandover executing on ENBShould consider power saving modeLTE_Idle mobilityCell selection and re-selectionMobility handled in aGWMeasurementMeasurement gap decided and coordinated by UE and ENBMeasurement controlled by ENB (opportunity, control, report, )
12 LTE: Huawei research points MAC functionsOuter ARQLocated in ENBOne or more ARQ entities for one UEOuter ARQ operation should be based on segmented/concatenated upper layer PDURe-segmentation/re-concatenation is supportedAdaptive header structure of ARQ PDU and status report should contain segmentation informationStatus report scheme should be reserved and simplified in LTESome HARQ and ARQ function could be merged. For example, only one sequence number is used and only one re-ordering function in the receiver.MAC architectureThere is only one MAC entity per cell, UL shared channel and DL shared channel should use joint scheduler.Segmentation/ concatenation should use scheduling information.Async. HARQ may be consideredMultiplexing data from different UEs into one block should be avoidedMore than one Transport Blocks could be transmitted during one TTI