Outline Chapter: 22 • History and Background · 5/28/2009 3G Evolution -HSPA and LTE for Mobile...

3G EvolutionChapter: 22p 22

LTE Ad dLTE Advanced

Payam Amani

P A i@ it lth

Department of Electrical and Information Technology

[email protected]

5/28/2009 3G Evolution - HSPA and LTE for Mobile Broadband 11

Outline

• History and Background

• IMT-Advanced Time Schedule in ITU

• LTE Advanced

• Fundamental requirements for LTE Advanced

• Extended Requirements Beyond ITU Requirements

• Technical components of LTE Advancedp


History and Background

• 1980: Early discussions on a global standard for 3G mobile i ti ithi ITU (FPLMTS)communications within ITU (FPLMTS).

• FPLMTS later named IMT-2000.

• Isolated activity within ITU focusing on high level scenarios and requirements.

• Actual technical specification of 3G radio access technologies took place in 3GPP and 3GPP2technologies took place in 3GPP and 3GPP2.

R lt b itt d t IMT 2000 d i d ITU l• Results submitted to IMT-2000 and received ITU approval.5/28/2009 3G Evolution - HSPA and LTE for Mobile Broadband 3


• IMT-2000 : not a radio access technology but a family of di t h l i f lfilli i t IMTradio access technologies fulfilling requirements on IMT-

2000 being approved by ITU.

• Late 1990s: While first phase of the 3G radio access technologies were being finalized ITU considered a steptechnologies were being finalized, ITU considered a step beyond IMT-2000.

• First named ”A system beyond IMT-2000”, later called IMT-Advanced.d a ced

• During 2007, more detailed technical issues discussed inDuring 2007, more detailed technical issues discussed in ITU.



• March 2008, ITU issued a circular letter inviting for candidate di i t f t h l i f IMT d dradio interface technologies for IMT advanced.

S h b i i t d t t k l d i 2009• Such submissions are expected to take place during 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 gyIMT-Advanced.


IMT-Advanced Time Schedule in ITU


LTE Advanced

• A study item on LTE-Advanced started in 3GPP in March 20082008.

• Main tasks: Requirements definition and investigation and proposal of technology components to be part of LTE-AdvancedAdvanced.

• 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.


LTE Advanced and ITU Advanced


LTE-Advanced

• April 2008: A workshop held by 3GPP to discuss different i t d b i t h l t f LTErequirements and basic technology components for LTE-

Advanced.

• The study Item will follow till fall 2009 when all technical specifications will be finalized.specifications will be finalized.

• Initialization of a work item to discuss detailed specification of pLTE-Advanced.

• Early 2011: Making LTE-Advanced ready for first commercial deployment will be finalized.

• Well alligned with IMT-Advanced time line.5/28/2009 3G Evolution - HSPA and LTE for Mobile Broadband 9

Fundamental requirements for LTE AdvancedAdvanced• Complete fulfillment of the requirement for IMT-Advanced defined by

ITUITU.• LTE-Advanced is an evolution of LTE and has to fulfill a set of

backwards compatibility requirements.

Backward compatibility in terms of :

1: Spectrum coexistence:For a LTE release terminal, an LTE Advanced cell should appear as a LTE release 8 cell

2: Infrastructure: Upgrading already installed LTE infrastructure to LTE Advanced capabilities with a reasonable cost.

3. Terminal implementation: Possibility of introducing LTE Advanced functionality in mobile terminals with a reasonable incremental complexity and associated cost compared to current LTE capability.


Fundamental requirements for LTE AdvancedAdvanced

L t d th t iti f LTE Ad d biliti ithi th• Low cost and smooth transition of LTE Advanced capabilities within the network.

• Self Optimising Networks

– Enhanced Self Optimising and Self Configuring capabilities, to further reduce operational resources, complexity and cost. This should allow SON to work in a fully autonomous manner.

– SON and O&M to fully function in multi-vendor environment.


Extended Requirements Beyond ITU RequirementsRequirements• 3GPP’s LTE Advanced should not be limited to fulfillment of

th ITU IMT Ad d i tthe ITU IMT-Advanced requirements.

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 in the uplink.

– Substantial improvement in system performance such as cell and user throughput with target values significantly exceeding those of IMT-Advanced.

– Possibility for low cost infrastructure deployment and terminalsPossibility for low cost infrastructure deployment and terminals.– High power efficiency, that is low power consumption for both

terminals and infrastructure.– Efficient spectrum utilization including efficient utilization of

fragmented spectrum.


Technical components of LTE Advanced

• Wider bandwidth and carrier aggregation:

– The targeted peak data rate for LTE Advanced can only be fulfilled in a reasonable way with a furthure increase of transmissionin a reasonable way with a furthure increase of transmission bandwidth compared to what is supported by the first LTE release.

– Increase of maximum transmission bandwidth beyond 20 MHz, possibly up to 100 MHz or even beyond for both downlink and Uplink.p

Component carriers(LTE Rel. 8 carriers)

e.g. 20 MHz


Five component carriers Total bandwidth of 100 MHz


– However, for many operators consecutive allocation of 100 MHz unlikelyunlikely

• optimised performance needed for smaller bandwidths of e.g. 50 MHz

• low cost/complexity (i.e. not fully flexible) resource aggregation to be considered

• Extended multi-antenna solutions:– As a minimum, support for spatial multiplexing on the uplink is

anticipated to be part of LTE Advanced. This is needed to fulfill the peak spectral efficiency requirementspeak spectral efficiency requirements.



E t ti f d li k ti l lti l i t th f l– Extention of downlink spatial multiplexing to more than four layers• Limitted application to high SNR scenarios as benefits of 8 layer spatial

multiplexing are only present in these cases.

M lti l hi ll di d t t d t t l– Multiple geographically dispersed antennas connected to a central baseband processing unit are used.

– Coordinated multipoint transmission-reception beyond the traditional th t itthree sector sites.



• Introduction of carrier aggregation as part of LTE Advanced ll f t ti hi h i i ltallows for spectrum aggregation which is simultaneous

usage of different non-contiguous spectrum fragments for communication to/from a single mobile terminalcommunication to/from a single mobile terminal.

• Major impact on terminal implementation.– Implementation:Implementation:

• Limmited number of aggregation scenarios.• Aggregation over dispersed spectrum only being supported by most

d d t i ladvanced terminals.

Two aggregated carriers Total bandwidth of 40 MHz

20 MHz20 MHz

gg g



• Coordinating the transmission from the multiple antennas b d t i th i l t i ti fcan be used to increase the signal to noise ratio for users

far from the antenna sites. Also can improve power amplifier utilization in the networkamplifier utilization in the network.

Central unit


Advanced repeaters and relaying functionalityfunctionality• Link performance of LTE is quite close to Shannon limit.

• From a link budget prospective, very high data rates targeted by LTE Advanced require a higher SNR compared to the same for wide area cellular networks.

• Denser infrastructure deployment and/or various beamforming strategiesbeamforming strategies.

• Difference relaying solutions can also be used to provide• Difference relaying solutions can also be used to provide very high data rates over large geographical areas.


Advanced repeaters and relaying functionalityfunctionality• A wide range of relay types can be envisioned, ranging

f i l t hi h l d d t d ffrom simple repeaters which are already used today for coverage improvement in troublesom spots to more advanced solutions where the relay can be seen as a baseadvanced solutions where the relay can be seen as a base station (self-backhauling: the transport network from the relay uses the same air interface as the terminals.). y )


LTE Advanced Workshop

Draft LTE Advanced RequirementsSource: 3GPP TSG RAN Chairman


Draft LTE Advanced Requirements

• GeneralLTE Advanced shall be an evolution of LTE– LTE Advanced shall be an evolution of LTE

• All requirements/targets in TR25.913 apply to LTE-Advanced• LTE terminal shall be supported in LTE-advanced networks• an LTE Advanced terminal can work in an LTE part of the• an LTE-Advanced terminal can work in an LTE part of the

network

– Allow coverage ranging from Macro cells to indoor environment g g gsuch as Home coverage

– Primary focus of LTE-Advanced is low mobility users

– Self-configuration and optimization shall be further enhanced

F t l d t d i i l– Features already supported in previous releases are a pre-requisite for being supported by LTE advanced

• Handovers with legacy RATs• Network sharing


Network sharing


• General– Non backward compatible elements introduction shall be subject to

TSG RAN Decisions

– LTE advanced shall support FDD and TDD mode of operation with maximum commonality

– Cost reduction• Low cost of the infrastructure deployment and terminal for LTE

advanced shall be an essential elementadvanced shall be an essential element• Power efficiency in the infrastructure and terminal shall be an essential

element• Backhauling shall minimize cost per bit• Backhauling shall minimize cost per bit

– Minimizing additional complexity for the terminal


– Multi-vendor support shall not be degraded from LTE Release 8


• Spectrum• Spectrum– Aggregation of LTE spectrum

• Non contiguous as well as contiguous

– Scalable Up to 100 MHz

– Potential bands in addition to the already allocated ones for • 450−470 MHz band, • 698−862 MHz band698 862 MHz band, • 790−862 MHz band, • 2.3−2.4 GHz band, • 3 4−4 2 GHz band and• 3.4 4.2 GHz band, and• 4.4-4.99 GHz band.

O ti f LTE d LTE Ad d i th t


– Operation of LTE and LTE-Advanced in the same spectrum

Draft LTE Advanced Requirements• Performances

– Fulfill IMT-Advanced requirements within the ITU-R time plan– Target for Peak data rate:– Target for Peak data rate:

• Peak data rate in DL: [up to] 1 Gbps• Peak data rate in UL: [Greater than 500 Mbps]

– Target for spectrum efficiencyP k• Peak

– Uplink: [15] b/Hz/s– Downlink: [30] b/Hz/s

• Average– Uplink: [2] b/Hz/s– Downlink: [3.2] b/Hz/s

• And at cell edge– Uplink: [0.05] b/Hz/sp [ ]– Downlink: [0.1] b/Hz/s

• Assumption:– Minimum antenna configuration to be considered, 2x2 for Downlink,

1x2 for Uplink1x2 for Uplink– Deployment scenario considered for absolute values is case 1 in

TR25.814– Similar relative gains are targeted for other system scenario in

TR25.814


– Additional indoor scenarios[TBD] should be considered


• Performances• Performances– The same inter-RAT interworking capability with at least

same performance as in LTE Release 8

– Intra-RAT handover performance shall be same or better than LTE Release 8than LTE Release 8

– Delayy• Not worse than LTE, i.e. control plane delay <100ms and

(unloaded) user plane delay < [5 ms/10 ms]

– VoIP capacity• [300] concurrent VoIP @5MHz


Questions:

Thanks for your attention :

Q ti ?Questions?


Outline Chapter: 22 • History and Background · 5/28/2009 3G Evolution -HSPA and LTE for Mobile...

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