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Keysight KTH Wireless Seminar Intro
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Copyright © 2014 Keysight.
All rights reserved
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
Page
5G: 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
Copyright © 2014 Keysight.
All rights reserved
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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.
All rights reserved
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5G: A sampler of Interesting Cases
– Massive MIMO
– Device-To-Device Communications
– Centralized RAN (Cloud RAN)
14-Nov-14Copyright © 2014 Keysight.
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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‼‼‼‼
Copyright © 2014 Keysight.
All rights reserved
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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
14-Nov-14Copyright © 2014 Keysight.
All rights reserved
Source: IEEE Communcations Magazine: June 2014
Page
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
14-Nov-14Copyright © 2014 Keysight.
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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…
Copyright © 2014 Keysight.
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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”…
14-Nov-14Copyright © 2014 Keysight.
All rights reserved
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14-Nov-14Copyright © 2014 Keysight.
All rights reserved
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