Post on 30-Jan-2018
transcript
ETSI Workshop on Future Radio Technologies: Air Interfaces
Jian Luo (presenter)Ali A. Zaidi, Jaakko Vihriälä, Domenico Giustiniano, Yinan Qi, Hardy Halbauer, Dimitri Kténas, Richard Weiler, Honglei Miao, Javier Lorca
Sophia‐Antipolis, France , 01/27‐28/2016
mmMAGIC
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Outline
Overview of mm‐wave air‐interface design mm‐Wave specific challenges for air‐interface design KPI’s and design principles Summary and future work
WORK PACKAGE 4
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Air Interface Design for mm‐Wave: Overview
Topics: Waveform Channel code &
Retransmission Frame
structure and numerology
Multiple access and duplexing
Initial access
28/01/2016
Directional links
RF impairments
Power efficiency
Channel charact.
Blockage
Transceiver arch.
Wave‐form
Channel code
Frame Structure
Efficient access schemes
Multi‐antenna tech.
Indoor/Outdoor
Access/Backhaul
Mobility (up to vehicular)
LOS/NLOS
Diverse UE types
Low latency requirements
mm‐wave Challenges mm‐wave Scenarios
Support
SimulationHardware‐in‐the‐Loop Trial
Test and verify
Design and optimize
Design
constraints
Require
… …
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Outline
Overview of mm‐wave air‐interface design mm‐Wave specific challenges for air‐interface design KPI’s and design principles Summary and future work
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mm‐Wave specific Challenges (1)
High free space loss and directional transmission
• Antenna gain must be increased to achieve reasonable coverage → Direc ve links
• Directive links will affect effective channels, interference characteristics, broadcast signaling etc.
Different propagation characteristics
• Sparsity of path clusters
Vunerability to blocking/shadowing• Problem for outdoor to indoor coverage• Coverage holes exist within cell ranges
Channel under mobility• Strong Doppler effect• Beam misalignment• Intermittant link quality
73 GHz @Entrance Hall
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mm‐Wave specific Challenges (2)• RF impairments deteriorate
with increasing frequency• Phase noise• I/Q‐imbalance• Sampling jitter of ADC • Power Amplifier (PA)
nonlinearity• Reduced PA efficiency• Large bandwidth
• High processing demand, large processing delay, power consumption
Phase noise PA nonlinearity
• Hybrid transceiver• Puts constraints on radio interface design
• Support both backhaul and access• Support stand‐alone and overlay
networking• Frequency uncertainty
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Outline
Overview of mm‐wave air‐interface design mm‐Wave specific challenges for air‐interface design KPI’s and design principles Summary and future work
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Waveform Design Design KPI’s
Peak‐to‐Average‐Power‐Ratio (PAPR)
Robustness against RF impairments
Spectral efficiency Compatibilty with multi‐antenna
technologies Implementation complexity Good time localization e.g. short
decaying time of the signal relative to TDD guard period
Flexibility/adaptability of the waveform
Robustness against Doppler effect Impact on link budget
Waveform Candidates Multi‐carrier family: CP‐OFDM, W‐OFDM, P‐OFDM, UW‐OFDM, UF‐OFDM, FQAM‐OFDM, FBMC‐QAM, FBMC‐OQAM
Single carrier family: (Precoded)‐SC‐FDMA, zero‐tail DFT‐s‐OFDM, SC‐DQAM, SC‐ceCPM
Approach Selection of waveform candidates Software defined RI: Adapt waveform to different
scenarios/channel conditions/requirements Different waveforms and pulse shapes
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Channel Code and Retransmissions Design KPI’s for
channel code Throughput Throughput per
hardware resource unit, e.g. per chip area
Latency Error correction
capability Complexity Power consumption Memory
consumption Suitability to re‐
transmission schemes
Design KPI’s for retransmissions Latency Complexity Reliability Suitability to forward
error correction (channel code design)
Flexible round trip time for varying degrees of centralization
Design aspects for channel code and retransmissions Widely varying block lengths and code rates to be supported
Reduced encoding/decoding complexity for ultra‐high data rates
New ARQ/HARQ concepts with tight limits on complexity and latency
Possibility of fast retransmissions under partial FEC decoding mechanisms
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Frame Structure and Numerology Main design aspects:
Design against hardware impairments
Frame structure supporting beamforming
Design against mobility Overhead reduction Preamble and RS design Common and dedicated control Joint backhaul and access Stand‐alone and non‐
standalone cases Scalable and hardware agnostic
air interface
Design KPI’s Throughput Robustness to HW
impairments and Doppler
Latency Mobility support
Candidates TDD frame structure
with flexible DL/UL propotion
Separation of control and Data channels
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Multiple Access and Duplexing Schemes
30.11.2015
Design KPI’s Data rate Connection density Latency Flexible scheduling Scheduling
complexity Resource usage
efficiency Robustness to PHY
imperfections Availability and
accuracy of context information
Consider extensive use of antenna arrays
Exploit context‐aware information
Consider multiple users with different requirements
Flexible adaptation to dynamic UL/DL traffics
Consider coexistence of different operators, networks and standards
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Initial Access Schemes
30.11.2015
Design KPI’s Access delay Access ratio Overhead Complexity Availability and
accuracy of context information
Standalone/non‐standalone operations support
Antenna configurations support
Exploit sub‐6 GHz coverage
Exploit contexual information
Coupling beamforming and initial access
Support different transceiver/antenna configurations
mm‐wave beam finding
Assistance from sub‐6 GHz network(If available)
mm‐wave AP
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Outline
Overview of mm‐wave air‐interface design mm‐Wave specific challenges for air‐interface design KPI’s and design principles Summary and future work
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Summary and Furture Work A number of mm‐wave specific challenges summarized
Channel, impairment, bandwidth, transceiver, deployment etc.
KPI’s and design principles identified/derived For topics: waveform, channel code and re‐transmission schemes, frame
structure and numerology, multiple access and duplexing, initial access
Future works: Develope/evaluate technology components/candidates according to the
KPI’s and design principles, addressing the challenges Mapp technology components to use cases
28/01/2016
THANK YOU!
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