Presentation on Technologies for 5G networks:- challenges and opportunities

1. Technologies for 5G
networks:
challenges and
opportunities
Kailash bhati
2014uec1632
Electronics & communication Engineering
Guieded by dr. ghanshyam singh sir

2. Content
Introduction of 5G
Demands
Evolution of 5G
Features of 5G
Potential technologies
References
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3. INTRODUCTION

4. increasing demands
• High traffic volume (massive capacity) ,future requirement is a 1,000× increase in data traffic for 2020
and beyond
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• Increased indoor and small cell/hotspot traffic, which will make up the majority of mobile traffic
volume—today, roughly 70 percent of mobile traffic happens indoors
•
• Higher numbers of connected devices (massive connectivity) stemming from the internet of things (iot),
which will support massive machine-to-machine (M2M) communications and applications
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• Improved energy consumption—5g must be a green network to reduce its carbon footprint

6. Evolution of 5g
• LTE-Advanced: The bridge between 4G and 5G
•
• LTE Advanced or LTE-A is the evolution of the original LTE
technology toward even higher bandwidths. LTE-A promises
nearly three times greater speed than the basic LTE network and
comprises of the following five building blocks:
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7. • Carrier Aggregation- which allows mobile network operators to combine a
number of separate LTE carriers. This enables them to increase the peak
user data rates
• Increased MIMO-
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• Coordinated Multipoint (COMP)- to improve cell edge user data rate
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• Relay Station - an amplifier for restoring the strength of a transmitted signal.
booster amplifier
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• Heterogeneous Network or HetNet- connecting computers and other
devices with different operating systems and/or protocols
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8. Potential technologies
• dense small cell deployment
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• M-MIMO
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• D2D
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• M2M
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• millimeter-wave communications
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• In addition , advanced coordinated multipoint (CoMP), carrier aggregation, multiple radio access technology (M-RAT), efficient coding
techniques, network virtualization, and the emergence of cloud radio access networks (C-RAN)

9. Classification of technologies
1.Capacity and speed
2.Latency
3.Spectral efficiency
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4.Massive connectivity and IOT

10. 1.Network Capacity and Data Speed Improvement•
• Dense small cell deployment
• to offload macrocells and improve signal power.
• Small cells must be deployed with a limited cell radius to help
reuse the spectrum (increase spectral efficiency) and increase
the network capacity
• Challenges:
• too many handovers or handover failure and call drops
• Intercell interference

11. 1.Network Capacity and Data Speed
Improvement
ØMillimeter-wave frequency band( for 5G it is 20-90Ghz)
• improved quality of service (QoS) by utilizing additional spectrum
(higher frequencies and wider bandwidth)
• Having different environmental impacts
ØChallenges
• High path loss
• Signal attenuation
• Too sensitive to blockages
• Solution -- beamforming and a larger antenna array

12. 1.Network Capacity and Data Speed
Improvement
• Massive MIMO and beamforming(key enabling tech for 5G)
• Improve signal strength resulting in higher cell throughput, better Edge cell performance
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ØChallenges
Ø
• Pilot contamination- is the presence of a minor and unwanted constituent in material, physical body, natural
environment, at a workplace, etc
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• huge costs and complexity
• Physical size is a point of concern
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14. 2.Latency reduction
• Time taken to complete a single ,full trasction
• Current latency is about 15ms based on 1-ms subframe
• Latency for 5g –1ms
• It’s vital to enable savings and long battery lifetimes
• Techniques to reduce latency
Ødense small cell
ØD2D- can handle local traffic

15. 2.Latency reduction
Challenges
ØEfficient proximity detection – less efficient GPS systems
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ØNetwork integration – not able to keep up with your job
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ØNative support in future
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16. 3.Spectral Efficiency Improvement
• It can be improved by increasing modulation order
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• OFDM(orthogonal frequency division multiplexing )
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ØUses multipath carriers to transmit simultaneous subframes after
dividing the main stream and modulating each subframe on a
different subcarrier frequency

17. 3.Spectral Efficiency Improvement
• Challenges
•
ØOFDM has high PAPR (peak to average power ratio) which decreases power
amplifier efficiency
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18. 3.Spectral Efficiency Improvement
• Some new schemes to improve spectral efficiency
• NOMA( non orthogonal multiple access )
• FBMC( filter bank multicarrier )
• SCMA( sparse coded multiple access )

19. 4. Massive Connectivity and the IoT
• Due to massive connectivity there will be network congestion so several
orders of magnitude increase in network connectivity and capacity is
required
• Which can be met with following technologies
• Network densification ,dense small cell deployment ,M-MIMO
• And NFV(network function virtualization )
• Will make function with cloud computing infrastructure

20. References
• S. Chen and J. Zhao, “The Requirements, Challenges, and Technologies for 5G of Terrestrial Mobile Telecommunication,” IEEE
Comm. Magazine
• 5G: What Is It?, white paper, Ericsson, 2014
• . J. Boyd, “Fujitsu Makes a Terahertz Receiver Small Enough for a Smartphone,” IEEE Spectrum
• F. Boccardi et al., “Five Disruptive Technology Directions for 5G,” IEEE Comm. Magazine
• J.G. Andrews et al., “What Will 5G Be?” IEEE J. Selected Areas in Comm.
• P.K. Agyapong et al., “Design Considerations for a 5G Network Architecture,” IEEE Comm. Magazine
• F. Khan and Z. Pi, “An Introduction to MillimeterWave Mobile Broadband Systems,” IEEE Comm. Magazin
• S.G. Larew et al., “Air Interface Design and Ray Tracing Study for 5G Millimeter Wave Communications,” Proc. IEEE Globecom
Workshops
• F. Khan, Z. Pi, and S. Rajagopal, “Millimeter-Wave Mobile Broadband with Large Scale Spatial Processing for 5G Mobile
Communication,” Proc. 50th Ann. Allerton Conf. Comm., Control, and Computin
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