Evolution road of 3GPP-LTE

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Evolution road of 3GPP-LTE
DOCUMENT GSC13-PLEN-41
FOR Presentation
SOURCE Huawei Technologies Co., Ltd
AGENDA ITEM Plenary 6.1
CONTACT(S) dmyglz_at_huawei.com

• Huawei Technology Co., LTD

Submission DateJuly 1, 2008
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Highlight of Current Activities (1)

• Developing the standard on the evolution of the
  3G mobile system
• The evolution of the 3G radio-access technology
  towards a high-data-rate, low-latency and
  packet-optimized.
• The main work of LTE focuses on
• Architecture
• eNB function
• Radio interface
• Band arrangement
• Transmission scheme
• RF related requirements
• Mobility and RRM
• SON
• Support of Interworking between LTE and 3GPP RAT
  or 3GPP2 RAT
• Currently focusing on LTE Stage 3 (finishing LTE
  Rel-8 specification)

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Highlight of Current Activities (2)

• Currently specifications completion level

Transmission scheme Multiple Address(100) Downlink OFDMA Uplink SC-FDMA Frame Structure (100) Modulation(100) Coding(100) Physical procedure(99)
Radio interface and protocols MAC(80) RLC(70) RRC(70)
Architecture and protocols Architecture and Interface Protocol Structure(100) RRM(90) OM(100) SON(70) MM(99)
RF related , band arrangement RF related requirement, the requirement support of RRM (80) LTE repeater(25)
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Strategic Direction

• Growing experience with the take-up of 3G is
  helping to clarify the likely requirements of
  users, operators and service providers in the
  longer term
• LTE project aims to ensure the continued
  competitiveness of the 3GPP technologies for the
  future
• The LTE standards development had been defined in
  the following phases
• SI phase finished at the Sep, 2006
• WI phase started at the June, 2006
• Currently it is in Stage 3 in WI phase. It is
  expected to launch the first LTE commercial
  version standard by the end of 2008.
• In 2009, the work will focus on the enhancement
  and Improvement of LTE.

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Challenges

• LTE business development and business model need
  more deep consideration because of HSPA and
  Wimax.
• With HSPA (downlink and uplink), UTRA will remain
  highly competitive for several years, most of
  operators are deploying 3G (UMTS/HSPA) network
  but have little income, it will be solved
  firstly.
• LTE performance can not be satisfied by some
  operators. So LTE system will be continued to be
  improved to fulfill the operators different
  requirements.
• The final choice of LTE technologies is not
  simply technological, it may be determined
  ultimately by IPR issues, there isnt a IPR
  solution till now.
• There are so many players in 3GPP which will take
  some difficulties to average benefit, So the
  schedule of LTE has been strongly delayed, It
  will be completed on Dec 2008.

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Next Steps/Actions

• Begin the Study Item of LTE-Advanced, It shall be
  an evolution of LTE.
• LTE terminal shall be supported in LTE-advanced
  networks
• an LTE-Advanced terminal can work in an LTE part
  of the network
• Allow coverage ranging from Macro cells to indoor
  environment such as Home coverage
• Primary focus of LTE-Advanced is low mobility
  users
• Self-configuration and optimization shall be
  further enhanced
• Features already supported in previous releases
  are a pre-requisite for being supported by
  LTE-advanced
• 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
  element
• Power efficiency in the infrastructure and
  terminal shall be an essential element
• Backhauling shall minimize cost per bit
• Minimizing additional complexity for the terminal

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Proposed Resolution

• N/A

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Supplemental Slides
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Huaweis activities in LTE

• Huawei is one of the pioneer companies who
  proposed the creation of LTE. We now have plenty
  of important proposals accepted involving in
  physical layer, high layer, interface and
  performance.
• Huawei is the editor of TS36.411 and TS36.421 of
  LTE specifications.
• Research view over the key issue
• Downlink OFDMA
• Intra-cell Orthogonality
• High spectra efficiency
• Uplink SC-FDMA
• Promising uplink multiple access scheme with
  higher terminal Power Amplifier efficiency
• Soft frequency reuse
• suppress the inter-cell interference
• improve cell edge data rate
• MIMO
• Higher average throughput and spectral efficiency
• MBMS on LTE
• Efficient Broadcast and Multicast transmission on
  LTE system

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LTE Huawei research points

• Downlink OFDMA
• Fast hopping pilot pattern
• Multiplexing frequency diversity and Multi-User
  diversity transmission
• AMC process for DL Link Adaptation
• PAPR Reduction
• Uplink SC-FDMA
• Distributed pilot design for localized data
• HARQ for UL
• CQI Report mechanism
• Inter-cell Interference Mitigation
• Soft Frequency Reuse
• Major frequency with reuse factor greater than
  1at cell edge
• Minor frequency with reuse factor 1 in near Base
  Station
• Major frequency bands coordinated with
  neighboring cells
• MIMO Transmit Diversity
• MU-MIMO
• Combination CDD (Cyclic Delay Diversity) and STTD
• MIMO for MBMS

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LTE Huawei research points

• RRC functions
• RRC states
• Location of the Upper RRC and lower RRC
• RRC terminated in ENB, but some functions such as
  PDCP control etc. should be in aGW
• LTE_Active mobility
• Handover method data forwarding and bi-casting
  or mixed method
• Handover executing on ENB
• Should consider power saving mode
• LTE_Idle mobility
• Cell selection and re-selection
• Mobility handled in aGW
• Measurement
• Measurement gap decided and coordinated by UE and
  ENB
• Measurement controlled by ENB (opportunity,
  control, report, )

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LTE Huawei research points

• MAC functions
• Outer ARQ
• Located in ENB
• One or more ARQ entities for one UE
• Outer ARQ operation should be based on
  segmented/concatenated upper layer PDU
• Re-segmentation/re-concatenation is supported
• Adaptive header structure of ARQ PDU and status
  report should contain segmentation information
• Status report scheme should be reserved and
  simplified in LTE
• Some HARQ and ARQ function could be merged. For
  example, only one sequence number is used and
  only one re-ordering function in the receiver.
• MAC architecture
• There is only one MAC entity per cell, UL shared
  channel and DL shared channel should use joint
  scheduler.
• Segmentation/ concatenation should use scheduling
  information.
• Async. HARQ may be considered
• Multiplexing data from different UEs into one
  block should be avoided
• More than one Transport Blocks could be
  transmitted during one TTI