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LTE ADVANCED PPT

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LTE-Advanced is essentially the next level of LTE. In particular, LTE-Advanced is LTE that fulfills the criteria to be considered 4G by the ITU.

LTE-Advanced is essentially the next level of LTE. In particular, LTE-Advanced is LTE that fulfills the criteria to be considered 4G by the ITU.

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LTE ADVANCED PPT LTE ADVANCED PPT Presentation Transcript

  • LTE ADVANCEDPRESENTEDBYRAAVI TRINATH
  • INTRODUCTION• LTE Advanced is a mobile communication standard, formallysubmitted as a candidate 4G system to ITU-T in late 2009.• It was approved into ITU,IMT-Advanced and was finalized by 3GPP inMarch 2011.• Standardized by the 3GPP as a major enhancement of the LTEstandard.• It was commercially implemented in October 2012 by Russiannetwork Yota.
  • Key milestones for ITU-R IMTAdvanced evaluationMILESTONE DATEIssue invitation to propose Radio Interface Technologies. March 2008ITU date for cut-off for submission of proposed Radio InterfaceTechnologies.October 2009Cutoff date for evaluation report to ITU. June 2010Decision on framework of key characteristics of IMT AdvancedRadio Interface Technologies.October 2010Completion of development of radio interface specificationrecommendations.February 2011
  • LTE-Advanced Development HistoryWCDMA(UMTS)HSPAHSDPA / HSUPAHSPA+ LTE LTE ADVANCED(IMTADVANCED)Max downlinkspeed (bps)384k 14 M 28 M 100 M 1 GMax uplinkspeed (bps)128 k 5.7 M 11 M 50 M 500 MLatency roundtrip time(approx.)150 ms 100 ms 50 ms(max)~10 ms Less than 5 ms3GPP releases Rel 99/4 Rel 5/6 Rel 7 Rel 8/9 Rel 10Approx years ofinitial roll out2003/4 2005/6 HSDPA2007/8 HSUPA2008/9 2009/10AccessmethodologyCDMA CDMA CDMA OFDMA/SC-FDMAOFDMA/SC-FDMA
  • LTE Advanced key features• Peak data rates: downlink - 1 Gbps; uplink - 500 Mbps.• Spectrum efficiency: 3 times greater than LTE.• Peak spectrum efficiency: downlink - 30 bps/Hz; uplink - 15 bps/Hz.• Spectrum use: the ability to support scalable bandwidth use and spectrumaggregation where non-contiguous spectrum needs to be used.• Latency: from Idle to Connected in less than 50 ms and then shorter than 5ms one way for individual packet transmission.
  • • Cell edge user throughput to be twice that of LTE.• Average user throughput to be 3 times that of LTE.• Mobility: Same as that in LTE• Compatibility: LTE Advanced shall be capable of interworking with LTEand 3GPP legacy systems.
  • COMPARISION BETWEEN LTE ANDADVANCED LTE
  • The main new functionalities introducedinLTE-Advanced• Carrier Aggregation (CA).• Enhanced use of multi-antenna techniques.• Support for Relay Nodes (RN).
  • CARRIER AGGREGATION• Each aggregated carrier is referred to as a component carrier.• Use maximum of five component carriers.• Each of BW of 1.4Mhz, 3Mhz,5Mhz, 10Mhz, 15Mhz or 20 Mhz.• The individual component carriers can also be of different bandwidths.
  • • Channel BW per CCs can be different b/w UL & DL.• The individual component carriers can also be of differentbandwidths.
  • THREE DIFFERENT SCENARIOSINTRA BAND, CONTIGUOUSINTRA BAND, NON CONTIGUOUSINTER BAND, NON CONTIGUOUS
  • o INTRA BAND,CONTIGUOUSThe CCs are allocated within the same operating band and they arecontiguous.o INTRA BAND, NON CONTIGUOUSThe CCs are allocated within the same operating band and they arenot contiguous.
  • • INTER BAND, NON CONTIGUOUSThe CCs allocated in different operating bandsThe CCs will experience different pathloss, which increases withincreasing frequency
  • MIMO, Multiple Input Multiple Output –or spatial multiplexing• Used to increase the overall bitrate• Through transmission of two (or more) different data streams on two(or more) different antennas• Using the same resources in both frequency and time, separated onlythrough use of different reference signals• to be received by two or more antennas.
  • • A major change in LTE-Advanced is the introduction of higher orderMIMO; 8x8 in the DL and 4x4 in the UL.• MIMO shall be used when S/N (Signal to Noise ratio) is high, i.e. highquality radio channel.• For situations with low S/N it is better to use other types of multi-antenna techniques to improve S/N, e.g. TX-diversity
  • RELAY NODES• The Relay Nodes are low power base stations• Provide enhanced coverage and capacity at cell edges• It can also be used to connect to remote areas without fibreconnection.
  • • The Relay Node (RN) is connected to the DeNB via the radio interfaceUn.• UEs at the edge of the donor cell are connected to the RN via Uu,• UEs closer to the DeNB are directly connected to the DeNB via the Uuinterface.• When the Uu and Un use different frequencies the Relay Node isreferred to as a Type 1a RN.• For Type 1 RN , Uu and Un utilize the same frequencies.• There is a high risk for self interference in the Relay Node.• This can be avoided through time sharing between Uu and Un,• Or having different locations of the transmitter and receiver.
  • LTE-Advanced Improvements