coexistence of wifi and lifi
TRANSCRIPT
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PRESENTED BY:
AVISHEK KUMAR JHAS7 ECE
COEXISTENSE OF WIFI AND LIFI TOWARDS:5G
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CONTENTS
• WIFI• LIFI• 5G• COEXISTENCE OF BOTH
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INTRODUCTION
• Inter- net-connected mobile devices is rapidly increasing.
• Watching HD streaming videos and accessing cloud-based services
• Heterogeneous networks (HetNets) will play an import- ant role in integrating a diverse spectrum to provide high quality-of-service (QoS)
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HETNETS• Hetnets or heterogeneous network• Het- Nets that utilize a combination of
macro cells.• A heterogeneous network is
a network connecting computers and other devices with different operating systems and/or protocols.
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• For example, local area network (LANs) that connect Microsoft Windows and Linux based personal computers with Apple Macintosh computes are heterogeneous
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WiFi
• WiFi is a technology that allows electronic devices to connect to a wireless LAN(WLAN) network.
• using the 2.4 gigahertz (12 cm) UHF and 5 gigahertz (6 cm) SHF ISM radio bands.
• Commonly used for connecting devices in wireless mode.
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Wi-Fi network element
• Access point(AP)- It is a wireless trans receiver which connects one or more devices.
• Wi-Fi cards-They accept wireless signals and relay information .
• Safeguards- Software protect networks from uninvited users.
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Advantages of Wi-Fi
• No wires• It is secure and easy to manage.• Ease of installation.• Fast and easy deployments.
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Limitation of Wi-Fi
• Limited range.• Data security risk.• Interference from other devices such as
telephones and microwave ovens.
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WHAT IS LI-FI?
• Li-Fi, as coined by Prof. Harald Haas during his TED Global talk, is bidirectional, high speed and fully networked wireless communications similar to Wi-Fi. Li-Fi is a subset of optical wireless communication (OWC) and can be a complement to RF communication (Wi-Fi or Cellular network), or a replacement in contexts of data broadcasting
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WORKING
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COMPARISON
WiFi LiFi
• Speed is about 54Mb/s.
• Use radio waves as carrier.
• LOS is not required
• Less secure.
• Speed is greater than 1Gb/s.
• Use visible light communication.
• Highly secure.
• LOS is highly required.College Of Engineering kuttanad
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• Slow connectivity
• Action of CSMA/CA.
PRIMARY CHALLENGES OF PRESENT WIRELESS
COMMUNICATION
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WHY WiFi AND LiFi TOGETHER ?
80% mobile users are indoor users
LiFi enabled indoor lights modeled as optical-SCs.
Today LiFi enables ONLY downlink. Uplink is still a challenge .
Provides High-speed traffic offloading and security enhancement.
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• How user devices are attached to the n/w?
• How mobility of the device is supported?
• How multiple users are accommodated?
CHALLENGES ON INCORPORATING LiFi AND WiFi
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• More than one luminaire at a sight.
• CSI : Channel State Information
• It is advantage whenever high through-put is required.
• Three possible scenarios:1. Single user provided with single luminaire.2. Single user provided with multiple luminaires.3. Multiple users provided with multiple luminaires.
LINKING UDs TO NETWORK LINKING UDs TO NETWORK
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• Maintaining connectivity for the mobile users is the primary challenge.
• Handover mechanism the traffic from a UD is rerouted from O-SCs to RF-SCs and vice versa.
• Other mechanism: OFDMA(Combined Using Orthogonal Frequency Division Multiple Access).
SUPPORTING UDs MOBILITY SUPPORTING UDs MOBILITY
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• In OFDMA data is transmitted on orthogonal narrow- band subcarriers.
• Users are allocated subcarrier groups to enable concurrent transmission.
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LiFi TRANSCEIVERS• In todays world there are LiFi receivers but
not transmitters.
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A Proposed Model Of LiFi Transceiver
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• Si PIN photodiode to provide high speed.• Plano-convex 1”lens are used to
concentrate the beam and enlarge the receiving area.
• BBU(base band unit) is used to convert Ethernet packets into DC-biased OFDM (orthogonal frequency division multiplexing) signals.
• Channel quality and illumination level are the factors that affects the data rate.
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PERFORMANCE OF INDOOR AND OUTDOOR LINKS
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1. Only WiFi is used to connect to internet.
2. Hybrid system – WiFi is used to connect the downlink and uplink along with LiFi as downlink.
3. Aggregate system – user is connected via both LiFi and WiFi system.
COMPARISON OF THREE SYSTEMS
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Hybrid System Aggregate system
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THROUGH PUT V/S DISTANCE
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THROUGHPUT V/S BLOCKAGE DURATION
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• Health sector: Since WiFi alone is not safe to be used in hospitals.
• Internet anywhere: street lamps, light of vehicles can be used to access internet anywhere in footpaths, roads, malls, anywhere where light source is available.
• IoT : Internet of things.
APPLICATIONS
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• Further evolution of LiFi and WiFi to higher data rates.
• Coexistence and further evolution of CSMA/CA and OFDMA.
• Physical layer techniques to enhance the user mobility.
• Improvement and development of the existing optical front ends.
FUTURE
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• Coexistence between LiFi and WiFi is a new promising research area.
• Improved techniques to enable high speed offloading.
• Both technologies together gives triple throughput for individual users.
• There is a great deal of research opportunity for LiFi+WiFi network.
CONCLUSION
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