1 / 18

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

jewel
Download Presentation

Consideration on Technical Candidates for IMT-Advanced

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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 !!!

More Related