Realize the Potential
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Transcript of Realize the Potential
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
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www.huawei.com
Realize the Potential
Du YinggangHuawei Wireless
WCNC09, April 2009 Budapest Hungary
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This is Huawei’s Headquarter (Shenzhen, China):
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What’s the potential?
How to realize the potential?
Questions from the title:
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What’s the potential: Application Aspects
• In the latest Mobile World Congress in Barcelona in Feb. 2009, many possible applications are attracting our eye-balls: Mobile Internet Mobile Payment Video Location based service 3D Piloting 3D Games ……
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What’s the potential: Technical Aspects
• More and more data application and real-time application means: Higher throughput
Wider bandwidth Higher spectrum efficiency Higher Cell-edge user throughput
Shorter latency
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Can we realize these potentials?
YES, WE CAN!
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How to realize the potential:
• Increase the spectrum efficiency within a cell in LTE-A: Carrier Aggregation Higher order MIMO:
8T8R scenarios are considered in two direction:– UE is aware of 8T: spatial multiplexing gain can be achieved but with
higher reference signal overhead– UE is only aware of 4T: The mapping from 8T(or even more transmit
antennas) to 4T can be implemented via beamforming/precoding.– In both scenarios, channel reciprocity is possibly applied
SU MIMO supported in UL Relay: to increase the coverage in cell-edge and/or improve
throughput in hot spot. CoMP
What’s CoMP?
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How to realize the potential:
• Increase the spectrum efficiency among cells: Interference among
neighboring cells become a serious issue to limit the performance upgrade.
So-called CoMP(Co-Ordinate Multi-Point) transmission:
One eNB contains one or multi-cells
One cell contains one or multi-RRUs
One RRU contains one or multi-antennas
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How to realize the potential:
• CoMP categories: Joint Processing (JP): data is available at each point in
CoMP cooperating set Joint Transmission: PDSCH transmission from multiple
points (part of or entire CoMP cooperating set) at a time Dynamic cell seletion: PDSCH transmission from one
point at a time (within CoMP cooperating set) Coordinated Scheduling/Beamforming (CS/CB): data is
only available at serving cell (data transmission from that point) but user scheduling/beamforming decisions are made with coordination among cells corresponding to the CoMP cooperating set.
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Intra-eNB CoMP - Inter-cell CoMP
• Inter-cellSU-CoMP
• Inter-cellMU-CoMP
Inter-celldiversity/precoding
Cell Cell Cell Cell Cell Cell
Inter-cell Inter-cell spaial multiplexing inter-cell diversity
Cell # Cell
#Cell#
1Cell
#
Inter-cell spatial multiplexing Inter-cell spatial multiplexing and inter-cell diversity
How to realize the potential:
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How to realize the potential:
• The issues to be considered for CoMP: Backhaul delay Timing alignment Reference Signal design RRU/Cell selection/Handover Feedback report by UE or allocation signaling by eNB
RRM
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How to realize the potential:
• Impacts on LTE-A implementation On UE
Higher complexity of UE receiver to support multi point reception
On eNB eNB would control and support multiple cells
– Joint point transmission and processing– Stronger Base band processing capacity– Enhanced eNB data transferring capacity among cells
with low latency and high bandwidth– Multi-link CSI
More powerful backhaul
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With the potential realized,
we can enjoy mobile service anywhere and anytime in our own way as our wish!
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