LTE3GLongTermEvolution_Mar2007_erics

LTE3GLongTermEvolution_Mar2007_erics - LTE 3G Long Term...

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Unformatted text preview: LTE 3G Long Term Evolution Dr. Erik Dahlman Expert Radio Access Technologies Ericsson Research © Ericsson AB 2007 2007-03-27 2 WCDMA 2005/6 2009/10 2003/4 2007/8 2011/12 HSPA HSPA evolution • To further boost 3G Mobile Broadband • To provide a smooth transition to 4G radio access (IMT-Advanced) 3G Long Term Evolution 3G LTE • Expansion to wider bandwidth • New radio access • Both paired and unpaired spectrum © Ericsson AB 2007 2007-03-27 3 3G LTE – Requirements and targets s Defined in 3GPP TR25.913 s Very high data rates Very high data rates – Peak data rates: More than 100 Mbps (downlink) / More than 50 Mbps (uplink) – Improved cell-edge user throughput s Very low latency Very low latency – Less than 10 ms (User-plane RAN RTT) – Less than 50 ms (Control-plane dormant-to-active transition) s Very high spectral efficiency Very high spectral efficiency s Spectrum flexibility Spectrum flexibility – Deployable in a wide-range of spectrum allocations of different sizes – Both paired and unpaired spectrum s Cost Cost-effective migration from current 3G systems effective migration from current 3G systems © Ericsson AB 2007 2007-03-27 4 3G LTE – 3GPP time line s SAE ( S ystem A rchitecture E volution ) in parallel to LTE December 2004 • Start ot LTE Study Item • LTE requirements and targets in TR25.913 June 2006 • Close of LTE Study Item • Start of LTE Work Item September 2007 • Finalization of LTE Stage 3 specification March 2006 • Approval of LTE Stage 2 specification November 2005 • Decision on basic LTE radio access • Downlink: OFDM • Uplink: SC-FDMA © Ericsson AB 2007 2007-03-27 5 LTE/SAE – Overall Architecture EPC EPC: Evolved Packet Core MME: Mobility Management Entity LTA RAN MME and SAE GW two separate nodes with open interface in between (S1 C-plane / S1 U-plane ) © Ericsson AB 2007 2007-03-27 6 SAE/LTE – Overall architecture S11 S10 S1 UP X2 S1 CP S3 S4 Iu CP Gb GSM WCDMA/HSPA Iu UP BSC RNC BTS NodeB Non-3GPP access S2a/b PCRF S7 LTE MME SGi (SGi) HLR/HSS Gr S6 SAE GW eNode B eNode B Internet, Operator Service etc. SGSN © Ericsson AB 2007 2007-03-27 7 NAS RRC PDCP RLC MAC Control-Plane User-Plane EPC eNB E-UTRAN Layer 1 SAE GW MME LTE/SAE – Protocol Architecture Layer 2 Layer 3 © Ericsson AB 2007 2007-03-27 8 3G LTE – Key radio-access features s Spectrum flexibility – Flexible bandwidth – Duplex flexibility s Advanced antenna solutions – Diversity – Beam-forming – Multi-layer transmission (MIMO) s New radio access – Downlink: OFDM – Uplink: SC-FDMA 20 MHz 1.25 MHz SC-FDMA OFDMA TX TX TX TX © Ericsson AB 2007 2007-03-27 9 3G LTE – Spectrum flexibility s Allow for operation in a wide range of different spectrum – Current and future 3G spectrum (2 GHs, 2.6 GHz, …) – Migration of 2G spectrum (e.g. 900 MHz)Migration of 2G spectrum (e....
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This note was uploaded on 09/13/2009 for the course EE 6345 taught by Professor Cantrell during the Spring '09 term at University of Texas at Dallas, Richardson.

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LTE3GLongTermEvolution_Mar2007_erics - LTE 3G Long Term...

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