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Consideration on Technical Candidates for IMT-Advanced

Consideration on Technical Candidates for IMT-Advanced. Date: April 7 th ~8 th , 2008 Agenda Item: 3 Source: LG Electronics, Inc. 3GPP RAN IMT-advanced Workshop. Outline. Overview of Target Features in IMT-advanced Approach toward LTE-advanced from 3GPP LTE

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Consideration on Technical Candidates for IMT-Advanced

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  1. Consideration on Technical Candidates for IMT-Advanced Date: April 7th~8th, 2008 Agenda Item: 3 Source: LG Electronics, Inc. 3GPP RAN IMT-advanced Workshop

  2. Outline • Overview of Target Features in IMT-advanced • Approach toward LTE-advanced from 3GPP LTE • Technical View for Enabling Technologies and System Design of LTE-advanced • Multi-hop relaying • Bandwidth Assignment • Enhanced MIMO • LTE technical items to be enhanced

  3. Main Features in IMT-advanced • Service Perspective • High quality mobile services • Enhanced peak data rate to support advanced services and application • Worldwide roaming capability • Compatibility of services within IMT and with fixed networks • Capability of interworking with other radio access systems • Implementation Perspective • A high degree of commonality of functionality worldwide while retaining the flexibility to support a wide range of services and applications in a cost efficient manner • User-friendly applications, services and equipment • User equipment suitable for worldwide use Source: Attachment 7.1 to Document 5D/97

  4. Provisional View for IMT-advanced Requirement in ITU-R WP5D Source: ITU-R WP5D IMT.TECH document, Feb. ’08 .

  5. Overall Company Views on 3GPP RAN Specification of IMT-advanced • Evolutionary Approach from 3GPP LTE Specification • Very close potential of 3GPP LTE with target requirements of IMT-advanced • Fast and efficient correspondence against the timeline of WP5D’s specification and commercialization for IMT-advanced • Careful Verification for Various Emerging Technology Candidates • Feasibility at the commercial implementation time • Accurate clarification for the trade-off between benefits and overhead/complexity • Efficient System Design for a New Value-added Service Creation • Provisioning a technical background for development of killer applications in IMT-advanced

  6. System Comparison between 3GPP LTE and IMT-advanced (1/2) • Peak Spectral Efficiency • Almost equal or better peak data rate potential of E-UTRAN compared with the related requirements of IMT-advanced • Cell Spectral Efficiency • Higher cell spectral efficiency requirement of IMT-advanced than performance of E-UTRAN in both uplink and downlink • Source: • ITU-R WP5D IMT.TECH document, Feb. ’08 • 3GPP RAN1 R1-072580, May ’07

  7. System Comparison between 3GPP LTE and IMT-advanced (2/2) • Cell Edge User Throughput • Higher cell edge throughput requirement of IMT-advanced than performance of E-UTRAN in both uplink and downlink • Latency • Equal or better requirement of E-UTRAN than that of IMT-advanced including handover latency • Source: • ITU-R WP5D IMT.TECH document, Feb. ’08 • 3GPP RAN1 R1-072580, May ’07 • 3GPP TS25.912

  8. Main Enhancement Factors of 3GPP LTE for Evolving toward LTE-advanced • Quantitative Enhancement Factors • Uplink and downlink cell spectral efficiency • Uplink and downlink cell edge user throughput • Peak data rate and system latency • Under the condition of a 3GPP’s decision regarding the superiority of a 3GPP LTE-advanced to IMT-advanced requirement • Non-quantitative Enhancement Factors • Network scalability • System inter-operability • Enhanced mobility support • Etc.

  9. Multi-hop Relaying (1/2) UE Peer-to-Peer Tx/Rx Conventional UE-eNodeB Tx/Rx • Direct inter-UE connectivity • Autonomous ad-hoc network configuration • and management • Conventional single-hop Tx/Rx between UE • and eNodeB as a basic connection scheme Wireless link connection eNodeB Relay Node Relay Node Relay Node Tx/Rx • Remote relay node Tx/Rx • L1 baseband processing and RRM • Coverage extension and throughput • enhancement

  10. Multi-hop Relaying (2/2) • Expected Trade-off • Consideration Points • Things to be further investigated • Verification for practical benefits against system overhand & complexity • Smooth migration toward multi-hop relaying in addition to single-hop UE-eNB transmission & reception • Early-stage features of multi-hop relaying • Max. 2 hop relaying, i.e. single relay node between UE and eNodeB • Minimized impact on UE spec. • No support of UE peer-to-peer ad hoc transmission & reception Benefits Drawbacks • System complication • Enlarged control/signaling overhead • Large change factors from the • current 3GPP LTE spec • Coverage extension • Throughput/capacity improvement • New killer application/service vs.

  11. Bandwidth Assignment • Consideration Points • Backward compatible co-existence with LTE and LTE-advanced in IMT carrier bands • SI or WI creation in 3GPP RAN for most carrier BW candidates given by WRC’07 • Support of smooth migration from LTE toward LTE-advanced • Support of wider system bandwidth in LTE-advanced for higher data rate transmission • Issue of the system BW of 20 or 40MHz on the system requirement documentation of IMT-advanced in ITU-R WP5D • Probable situation of using a more extended system BW for higher data rate support • Technical check points on implementation feasibility • Potential of commercial-level RF filter • Effective bandwidth range • Potential of commercial-level ADC • Sampling rate and quantization resolution • Decoding complexity • Channel decoding speed and required soft buffer size

  12. Backward Compatible Co-existence of LTE and LTE-advanced • Smooth Migration toward LTE-advanced on LTE Carriers • Further investigation for other possibilities including spectrum sharing • Co-existence of LTE in Wider Carrier Bandwidth of LTE-advanced • Baseline: FDM-based legacy zone support • Technical consideration points • Bandwidth camping of LTE system according to the bandwidth size of LTE-advanced • Bandwidth aggregation capability of LTE-advanced Freq Freq LTE LTE-advanced LTE LTE-advanced LTE LTE Carrier LTE Carrier LTE-advanced Time Time FDM-based allocation concept TDM-based allocation concept • Improved uplink cell-edge performance • and/or coverage extension • Flexibility restriction in new system design • More guard band overhead and • limited bandwidth utilization • Full transparency for UE Tx/Rx operation • Full bandwidth utilization • Large flexibility in new system design • Relatively weak power utilization on • uplink cell-edge UE transmission

  13. Bandwidth Aggregation • Motivation • Higher data rate support • Co-existence of LTE in wider carrier bandwidth of LTE-advanced • Basic cases • Consideration Points to Be Further Investigated • Feasibility of simultaneous multiple Tx/Rx RF processes • Maximum commercial-level RF BW capability • Implementation cost and complexity for multiple physical layer processing • Baseband decoding processing power • Case 1: Contiguous BW aggregation • Single or multiple Tx/Rx RF operation • Single or multiple physical layer processing under the single MAC/RRC • Case 2: Separate BW aggregation • Multiple (or single) Tx/Rx RF operation • Multiple (or single) physical layer processing under the single MAC/RRC

  14. eNodeB eNodeB Relay Node Relay Node Enhanced MIMO (1/2) • Main Motivation • Improvement of DL/UL peak & cell spectral efficiency • Improvement of DL/UL cell edge user throughput by applying an enhanced MIMO transmission considering multi-cell situation • Technology Candidates UL SU-MIMO & TxD using multiple RF chains Multi-cell MIMO: Type 1 (DL/UL Cooperative MIMO) Multi-cell MIMO: Type 2 (Adaptive Precoding/Beamforming) Enhanced DL/UL MU-MIMO UL Cooperative MIMO Wireless single-/multi-antenna transmission Interfernece

  15. Enhanced MIMO (2/2) • Number of antennas in an eNodeB and a UE • Improvement of overall spectral efficiency • Careful consideration of the required target performance and the feasible UE capability for LTE-advanced • Uplink single-user MIMO and transmit diversity • Improvement of UL peak & cell spectral efficiency • Issue points of UL SU-MIMO transmission scheme • Antenna power balancing • Low and uniform per-antenna PAPR • Cost effective design for DL/UL control signaling • Multi-cell MIMO • Improvement of DL/UL cell edge user throughput as well as cell spectral efficiency • Downlink/uplink cooperative MIMO (Type1): Multi-cell/site MIMO transmission and reception • Precoding based dual-cell unicast transmission • Enhanced MBMS transmission • Adaptive precoding/beamformaing (Type 2): Evolved DL/UL MIMO transmission scheme for inter-cell interference mitigation • Enhanced DL/UL single-user MIMO • Enhanced DL/UL multi-user MIMO

  16. LTE Technical Items to Be Enhanced (1/2) • Downlink/uplink Inter-cell Interference Management • Motivation • Significant improvement in downlink & uplink cell-edge user throughput and cell spectral efficiency • Related LTE items • DL/UL inter-cell interference coordination • DL/UL inter-cell power control mechanism • Consideration of relevant technologies • Multi-cell MIMO technologies • Dual-cell unicast transmission and fast cell-switching • Multi-hop relaying, etc. • Self-organizing & -optimizing Network • Motivation • Largely probable situation of using small remote eNodeBs for coverage extension and throughput enhancement • Mitigation of enlarged complexity/cost in deployment and network optimization for large number of eNodeBs • Consideration points • Rel.8 work item initiation coming along with home eNodeB • TBD whether further enhancement is necessary after investigating the specification results of current Rel.8 work item

  17. LTE Technical Items to Be Enhanced (2/2) • Multi-RAT Seamless Handover • Motivation • Enhanced requirement of inter-system interworking and its related mobility support • Consideration points • Extension level of inter-system interworking in addition to related Rel.8 work items • Minimized impact on LTE-advanced specification

  18. Thank you !!!

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