3G Evolution Outline Chapter: 22 p 22 • History and Background • IMT-Advanced Time Schedule in ITU • LTE Advanced LTE Ad LTE Advanced d • Fundamental requirements for LTE Advanced Payam Amani • Extended Requirements Beyond ITU Requirements Payam.Amani@eit.lth.se P A i@ it lth Department of Electrical and Information Technology • Technical components of LTE Advanced p 5/28/2009 3G Evolution - HSPA and LTE for Mobile Broadband 1 1 5/28/2009 3G Evolution - HSPA and LTE for Mobile Broadband 2 History and Background History and Background • 1980: Early discussions on a global standard for 3G mobile • IMT-2000 : not a radio access technology but a family of communications within ITU (FPLMTS). i ti ithi ITU (FPLMTS) radio access technologies fulfilling requirements on IMT- di t h l i f lfilli i t IMT 2000 being approved by ITU. • FPLMTS later named IMT-2000. • Late 1990s: While first phase of the 3G radio access technologies were being finalized ITU considered a step technologies were being finalized, ITU considered a step • Isolated activity within ITU focusing on high level scenarios beyond IMT-2000. and requirements. • First named ”A system beyond IMT-2000”, later called IMT- • Actual technical specification of 3G radio access Advanced. d a ced technologies took place in 3GPP and 3GPP2. technologies took place in 3GPP and 3GPP2 • During 2007, more detailed technical issues discussed in During 2007, more detailed technical issues discussed in • Results submitted to IMT-2000 and received ITU approval. R lt b itt d t IMT 2000 d i d ITU l ITU. 5/28/2009 3G Evolution - HSPA and LTE for Mobile Broadband 3 5/28/2009 3G Evolution - HSPA and LTE for Mobile Broadband 4
History and Background IMT-Advanced Time Schedule in ITU • March 2008, ITU issued a circular letter inviting for candidate radio interface technologies for IMT advanced. di i t f t h l i f IMT d d • S Such submissions are expected to take place during 2009. h b i i t d t t k l d i 2009 • Evaluation of the submitted candidates till mid 2010 Evaluation of the submitted candidates till mid 2010. • • Early 2011: Based of the outcome of the evaluation, formal Early 2011: Based of the outcome of the evaluation formal ITU-R recommendations for the IMT-Advanced radio interface specification will be drafted. p • LTE-Advanced: 3GPP’s candidate radio access technology for gy IMT-Advanced. 5/28/2009 3G Evolution - HSPA and LTE for Mobile Broadband 5 5/28/2009 3G Evolution - HSPA and LTE for Mobile Broadband 6 LTE Advanced LTE Advanced and ITU Advanced • A study item on LTE-Advanced started in 3GPP in March 2008. 2008 • Main tasks: Requirements definition and investigation and proposal of technology components to be part of LTE- Advanced Advanced. • LTE Advanced: The next major step in evolution of LTE • LTE-Advanced: The next major step in evolution of LTE. • LTE should provide the starting point for a smooth transition • LTE should provide the starting point for a smooth transition to 4G (IMT-Advanced) radio access. 5/28/2009 3G Evolution - HSPA and LTE for Mobile Broadband 7 5/28/2009 3G Evolution - HSPA and LTE for Mobile Broadband 8
Fundamental requirements for LTE LTE-Advanced Advanced Advanced • April 2008: A workshop held by 3GPP to discuss different • Complete fulfillment of the requirement for IMT-Advanced defined by ITU. ITU requirements and basic technology components for LTE- i t d b i t h l t f LTE • LTE-Advanced is an evolution of LTE and has to fulfill a set of Advanced. backwards compatibility requirements. • The study Item will follow till fall 2009 when all technical Backward compatibility in terms of : specifications will be finalized. specifications will be finalized. 1: Spectrum coexistence:For a LTE release terminal, an LTE Advanced cell should appear as a LTE release 8 cell • Initialization of a work item to discuss detailed specification of p LTE-Advanced. 2: Infrastructure: Upgrading already installed LTE infrastructure to LTE Advanced capabilities with a reasonable cost. • Early 2011: Making LTE-Advanced ready for first commercial 3. Terminal implementation: Possibility of introducing LTE Advanced deployment will be finalized. functionality in mobile terminals with a reasonable incremental complexity and associated cost compared to current LTE capability. • Well alligned with IMT-Advanced time line. 5/28/2009 3G Evolution - HSPA and LTE for Mobile Broadband 9 5/28/2009 3G Evolution - HSPA and LTE for Mobile Broadband 10 Fundamental requirements for LTE Extended Requirements Beyond ITU Advanced Advanced Requirements Requirements • 3GPP’s LTE Advanced should not be limited to fulfillment of • L Low cost and smooth transition of LTE Advanced capabilities within the t d th t iti f LTE Ad d biliti ithi th the ITU IMT-Advanced requirements. th ITU IMT Ad d i t network. – Support for pic data rates upto 1 Gbpsin the downlink and 500 Mbps Support for pic data rates upto 1 Gbpsin the downlink and 500 Mbps • Self Optimising Networks in the uplink. – Substantial improvement in system performance such as cell and user throughput with target values significantly exceeding those of – Enhanced Self Optimising and Self Configuring capabilities, to further reduce operational resources, complexity and cost. This should allow SON IMT-Advanced. to work in a fully autonomous manner. – Possibility for low cost infrastructure deployment and terminals Possibility for low cost infrastructure deployment and terminals. – High power efficiency, that is low power consumption for both – SON and O&M to fully function in multi-vendor environment. terminals and infrastructure. – Efficient spectrum utilization including efficient utilization of fragmented spectrum. 5/28/2009 3G Evolution - HSPA and LTE for Mobile Broadband 11 5/28/2009 3G Evolution - HSPA and LTE for Mobile Broadband 12
Technical components of LTE Advanced Technical components of LTE Advanced • Wider bandwidth and carrier aggregation: – However, for many operators consecutive allocation of 100 MHz unlikely unlikely – The targeted peak data rate for LTE Advanced can only be fulfilled • optimised performance needed for smaller bandwidths of e.g. 50 MHz in a reasonable way with a furthure increase of transmission in a reasonable way with a furthure increase of transmission bandwidth compared to what is supported by the first LTE release. • low cost/complexity (i.e. not fully flexible) resource aggregation to be considered – Increase of maximum transmission bandwidth beyond 20 MHz, possibly up to 100 MHz or even beyond for both downlink and • Extended multi-antenna solutions: Uplink. p – As a minimum, support for spatial multiplexing on the uplink is anticipated to be part of LTE Advanced. This is needed to fulfill the Component carriers (LTE Rel. 8 carriers) peak spectral efficiency requirements peak spectral efficiency requirements. e.g. 20 MHz Five component carriers � Total bandwidth of 100 MHz 5/28/2009 3G Evolution - HSPA and LTE for Mobile Broadband 13 5/28/2009 3G Evolution - HSPA and LTE for Mobile Broadband 14 Technical components of LTE Advanced Technical components of LTE Advanced • Introduction of carrier aggregation as part of LTE Advanced – Extention of downlink spatial multiplexing to more than four layers E t ti f d li k ti l lti l i t th f l allows for spectrum aggregation which is simultaneous ll f t ti hi h i i lt • Limitted application to high SNR scenarios as benefits of 8 layer spatial usage of different non-contiguous spectrum fragments for multiplexing are only present in these cases. communication to/from a single mobile terminal. communication to/from a single mobile terminal • Major impact on terminal implementation. – Implementation: Implementation: – Multiple geographically dispersed antennas connected to a central M lti l hi ll di d t t d t t l • Limmited number of aggregation scenarios. baseband processing unit are used. • Aggregation over dispersed spectrum only being supported by most advanced terminals. d d t i l – Coordinated multipoint transmission-reception beyond the traditional Two aggregated carriers � Total bandwidth of 40 MHz gg g three sector sites. th t it 20 MHz 20 MHz 5/28/2009 3G Evolution - HSPA and LTE for Mobile Broadband 15 5/28/2009 3G Evolution - HSPA and LTE for Mobile Broadband 16
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