building versatile network upon new waveforms technologies duesseldorf gmbh building versatile...

Security Level:

Huawei Technologies Duesseldorf GmbH

Building versatile network

upon new waveforms

Chan Zhou, Malte Schellmann, Egon Schulz, Alexandros Kaloxylos

HUAWEI TECHNOLOGIES CO., LTD.

35pt

32pt

) :18pt

5G networks: A complex ecosystem

Amazingly fast

(Data-rate, delay)

Great service in a crowd

(Accessibility, crowds)

Best experience follows you

(Accessibility, mobility)

Super real-time and reliable connections

(Delay, reliability)

Ubiquitous things communicating

(Devices, coverage, energy & cost)

5G service categories

Massive Internet of Things

Ultra-reliable communication

Ultra-low-latency communication

Ubiquitous communication

High-mobility communication

(V2X)

life-line communication

Broadcast-like communication


35pt

32pt

) :18pt

Requirements on 5G network

Latency

V2X, teleprotection, industrial automation and remote control applications require an end-

to-end latency less than several milliseconds LTE ≈ 100 ms

Since CP-OFDM has high synchronicity requirements , LTE applies a Timing Advance (TA)

procedure before the start of actual data transmission

TA causes at least one up- and downlink transmission cycle for connection setup

Preamble collision may occur, particularly in massive MTC scenario

High mobility

Applications for road traffic safety, high-speed train communication may have to support

speeds up to 500kmh

Doppler shift will largely impact the performance of the communication link.

CP-OFDM may need to increase the subcarrier spacing in order to adapt to the high

mobility scenario


35pt

32pt

) :18pt


Coverage

New 5G services require wireless access everywhere, even in critical environments.

Coverage range can be increased if transmission power can be confined within narrow band

Increasing transmission power in narrow sub-band will raise the out-of-band radiation

Reliability

99.999% for e.g. V2X communication

Critical in coverage holes or high mobility situation

Energy-efficiency

MTC requires long battery life to reduce the maintenance cost

The active time of the devices should be as short as possible


35pt

32pt

) :18pt


Support of low-cost devices

Complex signal processes and control mechanisms cannot be implemented in low-cost devices

Requirements on accurate synchronization have to be relaxed

Signaling overhead in massive connectivity

Massive IoT services will dramatically increase the signaling overhead

The system may become extremely inefficient if the network is dominated by small-package

traffic

Flexibility

Network should be flexible and have the ability to adapt to different services with particular

requirements in different environments

Also a variety of devices with special characteristics should be supported by the network

Network resources, including the spectrum, have to be split and optimized for special services

End-to-End network slicing


35pt

32pt

) :18pt

General description of multi-carrier systems :

System design parameters = degrees of freedom

- symbol period, - subcarrier spacing, - transmit pulse shape

P-OFDM – enabling waveform for a flexible air interface

Additional degrees of freedom by adapting the pulse shape gtx

Many waveform designs can be captured by the generalized function

CP-OFDM: rectangular gtx

Windowed OFDM: extended rectangular gtx with smoothened edges

F-OFDM and UF-OFDM can be covered by applying additional subband-wise filtering


35pt

32pt

) :18pt

Implementing P-OFDM

Efficient implementation of pulse shape filters by

poly-phase network (PPN), plugged into transmission chain

next to FFT

In particular, all algorithms developed for OFDM can be

reused, incl. MIMO schemes

Complexity

PPN based synthesizer and analyzer

10-30% higher complexity than

CP-OFDM modulator / demodulator

P-OFDM transceiver

Binary

Source π Symbol

Mod. S/P FEC Pilots IFFT PPN P/S

Baseband

to RF Channel

RF to

Baseband

Sync. S/P PPN FFT Chan.

Est.

Chan.

Equa. P/S

Symbol

Demod. π-1 FEC-1 Binary

Sink

…

…


35pt

32pt

) :18pt

End-to-end network slicing and adaptive air-interface

Different Numerology and Pulse shaping on different subbands

Slice 1 configuration

Slice 2 configuration

Network resources are assigned to

several network slices for special service

groups.

Each slice may apply different network

functions and protocols

Slices are distinguished by their unique

physical layer configurations including the

gtx, T and F


35pt

32pt

) :18pt

TA-Free and grant free access

P-OFDM using optimized Gaussian pulse shape

is robust against large timing offsets

TA procedure can be omitted

TA-free asynchronous transmission + SDMA

uplink request can be removed further

Grant-free scheme significantly reduces the

signaling overhead and delay

Effectively reduces the energy consumption

by reducing the active time


35pt

32pt

) :18pt

TA-Free and grant free access

Max.

Connection

number

Connection

Success Rat

Net

Connection

Number

OFDM +orth.

access OFDM-LTE 59K 90% 53K

OFDM +non-

orth. Access @3kmh 237K 88% 208K

@12kmh 237K 63% 149.3K

@30kmh 237K 36% 85.3K

P-OFDM

+non-orth.

Access

@3kmh 237K 90% 213K

@12kmh 237K 88% 208K

@30kmh 237K 80% 194K

BLER for a single user with timing offsets (asynchronous scenario)

Random access at different velocity

grant-free scheme based on optimized pulse shape exhibits much more robust performance

Blue: P-OFDM with optimized pulse shape

Red: CP-OFDM


35pt

32pt

) :18pt

High mobility and vehicle communication

1~3dB SINR gain compared to CP-ODFM

P-OFDM as promising technology in high mobility

scenario

BLER in high mobility scenario. Blue: P-OFDM, red: CP-OFDM

System bandwidth 10 MHz

Duplex TDD

Subcarrier spacing 60 KHz

TF 1.25

Antenna configuration 2 or 4 Tx at BS

2 Rx at UE

PRB allocation 15 PRBs to one UE

MIMO mode Full rank open loop-MIMO

Channel estimation Real channel and noise estimation

MCS LTE MCS 4, 9, 16, 25

Channel models 802.11p 250kmh Onway

Hybrid ARQ Not modeled

Receiver LMMSE or QRD-ML

Reference signal LTE R-s DL CRS

Pulse shaping OFDM (K=1): rectangular pulse

P-OFDM (K=1):Orthogonalized Gaussian pulse

Sensor Range

V2V Vehicle-to-Vehicle Communication

V2I Vehicle-to-Infrastructure Communication

V2B Vehicle-to-Backend Communication

Bi-Directional Communication


35pt

32pt

) :18pt

Spectrum shaping and out-of-band leakage

P-OFDM has lower out-of-band leakage

compared to CP-OFDM

Only 1-2% overhead is required for the

guard band to achieve an interference

isolation of -50 dB (CP-OFDM ≈ 10%)

Supports in-band coexistence of different

numerologies in one unified air interface

Also facilitates the efficient implementation

of a narrow band system relevant for the

coverage enhancement

K = 4 K 1

TF = 1.07 Guard Subc. 9 27

Overhead (comp.

20MHz)

0.7% 2%

EVM for Edge Subc. -48.9 dB -57.2 dB

EVM for Central Subc. -48.9 dB -57.3 dB

TF = 1.25 Guard Subc. 7 14

Overhead (comp.

20MHz)

0.53% 1.05%

EVM for Edge Subc. -56.8 dB -55.8 dB

EVM for Central Subc. -56.8 dB -55.8 dB


35pt

32pt

) :18pt

Conclusions

CP-OFDM is not always the best solution for the air-interface of future mobile radio networks

In many key scenarios for 5G, i.e. massive IoT and high mobility communication, optimized pulse

shapes can provide much better performance

P-OFDM is proposed as the generalized implementation of the adaptive air-interface

End-to-end network slicing can be build on the P-OFDM based adaptive air-interface

reducing the required guard bands between PHY configurations of different network slices

supporting the implementation of different waveforms and numerologies on one platform

Copyright©2014 Huawei Technologies Duesseldorf GmbH. All Rights Reserved.

The information in this document may contain predictive statements including, without limitation, statements regarding the future financial and operating

results, future product portfolio, new technology, etc. There are a number of factors that could cause actual results and developments to differ materially

from those expressed or implied in the predictive statements. Therefore, such information is provided for reference purpose only and constitutes neither

an offer nor an acceptance. Huawei may change the information at any time without notice.

building versatile network upon new waveforms technologies duesseldorf gmbh building versatile...

Documents