Keysight KTH Wireless Seminar Intro

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Massive MIMO and mmWave

Why 5G is Not 4G++Technology Insights and Challenges

Why 5G is Not 4G++Technology Insights and Challenges

Bob Cutler, Principal Solutions ArchitectRoger Nichols, 5G Program Manager

Keysight Technologies

Bob Cutler, Principal Solutions ArchitectRoger Nichols, 5G Program Manager

Keysight Technologies

Copyright © 2014 Keysight. All rights reserved

Copyright © 2014

G: A Broad Spectrum of OpportunityThe Mobile Data Future

14-Nov-14

Today’s 2G/3G/4G NW

� Mobile data is real

� Works most of the time

ₓ Works well some of the time

ₓ WiFi works but not integrated

ₓ Don’t try this in a crowd!

ₓ Consumes 2% of WW power

Gateway toCompeting NW

Tomorrow’s 5G Network

� Great Service in a Crowd

� Amazingly Fast, Reliable, Real-time

� All Things Communicating

� Centralized and Seamless Networks


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FIVE G: Another one ??? WHY:

Massive Growth in Mobile Data Demand

Massive Growth in Number of Connected Devices

Exploding Diversity of Wireless Applications

Dramatic Change in User Expectations of the Network

Sound Business Model for Network Operators

Market And Societal Forces

14-Nov-14Copyright © 2014 Keysight.

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G: A sampler of Interesting Cases

– Massive MIMO

– Device-To-Device Communications

– Centralized RAN (Cloud RAN)


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Massive MIMO TheoryRedefinition of the “cell” in mobile wireless

Transceiver Antenna

14-Nov-14

From IEEE transactions on

Wireless Communications Vol

9 No 11 Nov 2010

Dr. Thomas Marzetta:

� ≡ ��

�� → ∞

THENImpact of Uncorrelated Noise = 0Impact of Fast Fading = 0Number of UE’s is independent of Cell Size Spectral Efficiency is independent of bandwidth

� � �� log! 1 #��$� %

��

AND …. &'()*+,-

./0→ 0‼‼‼‼


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Device-To-Device (D2D)

Relay Direct

Operator Controlled

DR-OCPricing (Operator incentivizes use)

• Discounts & Free Services

Interference Management• Managed by Operator

DC-OCPricing (Conflict: Max Profit��Max Utiity)

• Apply real-time Auction Theory

Interference Management• Managed by Operator

Device Controlled

DR-DCPricing (No Operator Benefit)

• User-negotiated?

Interference Management

• Distributed

DC-DCPricing (No Operator Benefit)

• User-negotiated?

Interference Management

• Distributed

A Matrix of Ideas

Source Info: IEEE Communications Magazine: May and June 2014 14-Nov-14Copyright © 2014 Keysight.

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D2D: WHY?

1: Context-Aware Applications

2: Redundancy

Serv

ice in

a C

row

d

3: Interference Management

Inter Cell Interference-Limited System

A? B? C?

Which signal do

I care about??

If Dominant Interference >> Residual Interference + Noise1) Estimate2) Reconstruct

3) Cancel Correlated Interference

But weaker interference must be treated as white noise

“Interference Forwarding” from Device-To-Device • Amplify & Forward

• Decode and Forward

• Quantize and Forward


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Source: IEEE Communcations Magazine: June 2014

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Centralized RANA Conceptual Model including RAN As-A-Service (RANaaS)

Adm/ConfigControl

RRM

MAC

PHY

RF

Network Management

Centra

lly E

xecute

dE

xe

cu

ted

At R

RH

Adm/ConfigControl

RRM

MAC

PHY

RF

Network Management

Execute

d a

t B

SC

en

tra

lly

Ex

ec

ute

d

ConventionalC-RAN

(BB Pooling)

RANaaS

Example: Partly Centralized(inter-cell) RRM

Flexible Functional Split

On-Demand Provisioning

Scalability

Resource Pooling

Elasticity

Service Metering

Multi-Tenency

Source: IEEE Communcations Magazine: May 2014


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Big Challenges

Massive MIMO

– Scaling Radio Elements

– Antenna Design

– Timing

– Baseband Power

Consumption

– Calibration

– NIMBY

D2D

– Inter-device Interference

– TDD? FDD? Uplink?

Downlink?

– Security

– Power Management

– Network control vs. Autonomous Devices

– Billing

C-RAN

– Interdependent Protocol

Layers

– Backhaul Speed and latency

– ICI given changing CSI

– QoS Management across

cells

– Network control vs.

Autonomous Devices

14-Nov-14

It will never work…


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Why Communications? Why 5G?Innovation or Insanity?

History Quiz

– First Telegraph?

– First Electrical Telegraph?

– First Radio Telegraph?

– What happened on 25 June 1876?

– Who invented spread spectrum?

– Did we need cell phones? TXT messaging, cameras (and video), email, gps, compass..

on phones?

Answers

– Claude Chappe: first practical semaphore-based

telegraph in France. 1792

– Cooke & Wheatstone OR Samuel Morse: 1837

– Guglielmo Marconi 1897

– Bell (Gray, Edison): demonstrated at

Philadelphia Centennial Expo

– Hedy Lamarr

– Define “need”…


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