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LTE Aida Botonji ć

LTE Aida Botonji ć. Why LTE?. Applications: Interactive gaming DVD quality video Data download/upload Targets: High data rates at high speed Low latency Packet optimized radio access technology. Goals: Improving efficiency Lowering costs Reducing complexity Improving services

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LTE Aida Botonji ć

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  1. LTE Aida Botonjić Tieto

  2. Why LTE? • Applications: • Interactive gaming • DVD quality video • Data download/upload • Targets: • High data rates at high speed • Low latency • Packet optimized radio access technology • Goals: • Improving efficiency • Lowering costs • Reducing complexity • Improving services • Making use of new spectrum opportunities and better integration with other open standards (such as WLAN and WiMAX) Tieto

  3. Introduction • November 2004, 3GPP Rel8: Long-term Evolution (LTE) • Related specifications are formally known as the evolved UMTS terrestrial radio access (E-UTRA) and evolved UMTS terrestrial radio access network (E-UTRAN) • LTE encompasses the evolution of: - the radio access through the E-UTRAN - the non-radio aspects under the term System Architecture Evolution (SAE) • Entire system composed of both LTE and SAE is called the Evolved Packet System (EPS) Tieto

  4. Cost efficient two node architecture Fully meshed approach with tunneling mechanism over IP network Access gateway (AGW) Enhanced Node B (eNB) eNB eNB eNB eNB eNB Network Architecture IP Service Network AGW AGW S1 S1 S1 S1 IP Transport Network X2 X2 X2 X2 Tieto

  5. Network Elements Tieto

  6. Protocol overview Control Plane User Plane UE eNB UE eNB MME NAS NAS NAS RRC RRC RRC RRC Handovers PDCP PDCP PDCP PDCP Ciphering Radio bearers RLC RLC RLC RLC Segmentation Logical channels MAC MAC MAC MAC HARQ Transport channels PHY PHY PHY PHY Modulation, coding Physical channels Tieto

  7. Frame structure LTE: WCDMA/HSPA: Tieto

  8. Channel Dependent Scheduling and Link adaptation • Frequency-domain & Time-domain adaptation • Focus transmission power to each user’s best channel portion • Adaptive modulation (QPSK, 16QAM, 64QAM) Tieto

  9. MIMOMultiple Input Multiple Output OFDMOrthogonal Frequency Division Multiplexing NRx ReceiveAntennas NTx Transmit Antennas LTE PHY – Main Technologies Tieto

  10. LTE PHY - MIMO Basics • Minimum antenna requirement: 2 at eNodeB 2 Rx at UE • Transmission of several independent data streams in parallel => increased data rate • The radio channel consists of NTx x NRx paths • Theoretical maximum rate increase factor = Min(NTx x NRx) Tieto

  11. LTE PHY - OFDM Basics • Sub-carriers are orthogonal • All the sub-carriers allocated to a given user are transmitted in parallel. • The carrier spacing is 15kHz Tieto

  12. Requirement comparison Tieto

  13. Feature comparison Tieto

  14. Conclusion • Scalable bandwidth • Downlink and uplink peak data rates are 100 and 50 Mbit/s respectively for 20 MHz bandwidth. • MIMO • OFDM • At least 200 mobile terminals in the active state for 5MHz bandwidth.If bandwidth is more than 5MHz, at least 400 terminals should be supported. • PHY key technologies enable higher spectral efficiency, peak rate and lower latency Tieto

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