1. Evolution road of 3GPP-LTE
DOCUMENT #:
GSC13-PLEN-41
FOR:
Presentation
SOURCE:
Huawei Technologies Co., Ltd
AGENDA ITEM:
Plenary; 6.1
CONTACT(S):
Evolution road of 3GPP-LTE
Huawei Technology Co., LTD
Submission Date: July 1, 2008

2. 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)

3. 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%)
O&M(100%)
SON(70%)
MM(99%)
RF related , band arrangement
RF related requirement, the requirement support of RRM (80%)
LTE repeater(25%)

4. 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.

5. 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 operator’s different requirements.
The final choice of LTE technologies is not simply technological, it may be determined ultimately by IPR issues, there isn’t 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.

6. 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

7. Proposed Resolution
N/A

8. Supplemental Slides

9. Huawei’s 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 TS and TS 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

10. 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

11. 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, )

12. 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