The document summarizes research on using quantum repeaters for mobile networks. It discusses how quantum repeaters work to transmit quantum information over long distances by generating entanglement between nodes. The document also discusses how a hybrid classical-quantum network could provide benefits like faster connectivity, lower costs and higher scalability compared to an all-quantum network. It presents models for analyzing the performance, power consumption, latency, data rate, energy efficiency and other metrics of hybrid and all-quantum networks. Experimental results using quantum circuits and simulators showed generating long-range entanglement is possible using quantum repeaters and entanglement swapping.
Computer networks have experienced an explosive growth over the past few years, which has lead to some severe congestion problems. Reliable protocols like TCP works well in wired networks where loss occurs mostly because of congestion. However, in wireless networks, loss occurs because of bit rates and handoffs too. TCP responds all losses by congestion control and avoidance algorithms, which results in degradation of TCP’s End-To-End performance in wireless networks. This paper discusses different issues and problems regarding use of TCP in wireless networks and provides comprehensive survey of various schemes to improve performance of TCP in Wireless Networks.
Different Issues and Survey of Proposed Solutions in TCP over Wireless Enviro...Ranjeet Bidwe
This document discusses issues with using TCP in wireless networks and proposed solutions. The main issues are higher bit error rates, lower bandwidth, mobility, and longer round trip times in wireless networks compared to wired networks. TCP was designed for wired networks and assumes packet loss is always due to congestion, but in wireless networks loss can occur for other reasons like bit errors, handoffs, or disconnections. This wrong assumption causes TCP to reduce its window size unnecessarily, degrading performance. The document surveys proposed solutions like Snoop to cache packets at base stations to hide losses from the sender, and Explicit Congestion Notification to signal congestion before queue overflows.
This document discusses the requirements for an LTE-capable transport network to deliver an optimized end-user experience. It focuses on capacity and latency. For capacity, a "single-peak, all-average" model is recommended that balances maximum capacity and economic feasibility. Latency must be low enough for applications like online gaming, with LTE offering latency around 20ms but the transport network also needing optimization to deliver that experience end-to-end. Dimensioning, aggregation, and latency guidelines are provided to help design an LTE transport network.
1. The document proposes an optimal Threshold Offloading (TO) algorithm to efficiently offload mobile data traffic from macrocells to femtocells in LTE networks. The TO algorithm considers the tradeoff between network signaling overhead from user mobility and femtocell offloading capability.
2. An analytical model is developed to quantify the performance of the TO algorithm and validate it through simulations. The results show that the TO algorithm can significantly reduce signaling overhead with minor reduction in femtocell offloading capability.
3. The paper provides network operators guidelines to set optimal offloading thresholds according to their management policies, offering a systematic approach based on the mathematical analysis.
High performance communication networkssHemaDarshana
This document discusses network elements and principal network elements. It describes links, which transfer data between two points, and switches, which transfer data between incoming and outgoing links. Links include optical fiber, copper, and wireless connections. The network can be modeled as a graph with edges representing links and nodes representing switches and user locations. Queuing models represent switches with input and output buffers that store data temporarily. Network performance depends on characteristics of the elements as well as traffic patterns and control policies that determine queuing delays and data losses.
Understanding Networking Devices – A Brief Introduction | TechLinu.comTechLinu.com
All but the most basic of networks require devices to provide connectivity and functionality. Understanding how these networking devices operate and identifying the tasks they perform are important skills for any network administrator and requirements for a Network+ candidate.
This brief guide introduces usually used networking devices that you may encounter in your career as Network Administrator. This guide is also useful for BCS students and for passionate network learners.
The document provides an overview of LTE architecture, interfaces, network elements, radio network and protocols. It describes the main LTE interfaces like Uu, S1, X2 and S5. The network elements discussed are eNB, MME, SGW and PGW. The radio network section covers physical layer technologies used in LTE like OFDMA, MIMO and QAM. It also explains transport channels, logical channels and layer 2 architecture in LTE.
Computer networks have experienced an explosive growth over the past few years, which has lead to some severe congestion problems. Reliable protocols like TCP works well in wired networks where loss occurs mostly because of congestion. However, in wireless networks, loss occurs because of bit rates and handoffs too. TCP responds all losses by congestion control and avoidance algorithms, which results in degradation of TCP’s End-To-End performance in wireless networks. This paper discusses different issues and problems regarding use of TCP in wireless networks and provides comprehensive survey of various schemes to improve performance of TCP in Wireless Networks.
Different Issues and Survey of Proposed Solutions in TCP over Wireless Enviro...Ranjeet Bidwe
This document discusses issues with using TCP in wireless networks and proposed solutions. The main issues are higher bit error rates, lower bandwidth, mobility, and longer round trip times in wireless networks compared to wired networks. TCP was designed for wired networks and assumes packet loss is always due to congestion, but in wireless networks loss can occur for other reasons like bit errors, handoffs, or disconnections. This wrong assumption causes TCP to reduce its window size unnecessarily, degrading performance. The document surveys proposed solutions like Snoop to cache packets at base stations to hide losses from the sender, and Explicit Congestion Notification to signal congestion before queue overflows.
This document discusses the requirements for an LTE-capable transport network to deliver an optimized end-user experience. It focuses on capacity and latency. For capacity, a "single-peak, all-average" model is recommended that balances maximum capacity and economic feasibility. Latency must be low enough for applications like online gaming, with LTE offering latency around 20ms but the transport network also needing optimization to deliver that experience end-to-end. Dimensioning, aggregation, and latency guidelines are provided to help design an LTE transport network.
1. The document proposes an optimal Threshold Offloading (TO) algorithm to efficiently offload mobile data traffic from macrocells to femtocells in LTE networks. The TO algorithm considers the tradeoff between network signaling overhead from user mobility and femtocell offloading capability.
2. An analytical model is developed to quantify the performance of the TO algorithm and validate it through simulations. The results show that the TO algorithm can significantly reduce signaling overhead with minor reduction in femtocell offloading capability.
3. The paper provides network operators guidelines to set optimal offloading thresholds according to their management policies, offering a systematic approach based on the mathematical analysis.
High performance communication networkssHemaDarshana
This document discusses network elements and principal network elements. It describes links, which transfer data between two points, and switches, which transfer data between incoming and outgoing links. Links include optical fiber, copper, and wireless connections. The network can be modeled as a graph with edges representing links and nodes representing switches and user locations. Queuing models represent switches with input and output buffers that store data temporarily. Network performance depends on characteristics of the elements as well as traffic patterns and control policies that determine queuing delays and data losses.
Understanding Networking Devices – A Brief Introduction | TechLinu.comTechLinu.com
All but the most basic of networks require devices to provide connectivity and functionality. Understanding how these networking devices operate and identifying the tasks they perform are important skills for any network administrator and requirements for a Network+ candidate.
This brief guide introduces usually used networking devices that you may encounter in your career as Network Administrator. This guide is also useful for BCS students and for passionate network learners.
The document provides an overview of LTE architecture, interfaces, network elements, radio network and protocols. It describes the main LTE interfaces like Uu, S1, X2 and S5. The network elements discussed are eNB, MME, SGW and PGW. The radio network section covers physical layer technologies used in LTE like OFDMA, MIMO and QAM. It also explains transport channels, logical channels and layer 2 architecture in LTE.
An Approach for Enhanced Performance of Packet Transmission over Packet Switc...ijceronline
With the increased use of real time applications, there is a need for improved network traffic and bandwidth management. Switches are being used by computer networks for enabling connection between those hosts which are not connected by a direct link. When two or more than two host attempt to transmit packet at the same time, collision in data packets occurred. In this paper an optimized performance of local area network in terms of collision count and some other parameter have been investigated using simulation model. Simulation results have been obtained in different network scenarios by varying the number of devices in the network.
This white paper discusses protocol signaling procedures in LTE networks, including:
1) The LTE network architecture includes eNodeBs, MMEs, SGWs, and PGWs that facilitate communication between UEs and the core network.
2) UEs access the network through random access procedures and establish default bearers for connectivity.
3) System information broadcasting allows UEs to select networks and camp on cells, while tracking area updates allow UEs to update their locations.
4) Attach procedures register UEs on the network and allocate IP addresses, while detach procedures deregister UEs when no longer requiring service.
The document provides an overview of Janet Abbate's book "Inventing the Internet" which explores the history of the development of the Internet from 1959 to 1994. The book examines the social and cultural factors influencing the Internet's evolution from ARPANET to a global network. It analyzes how the Internet was shaped by collaboration and conflict between various players including government, military, computer scientists, and businesses. The author traces the technological development of the Internet and links it to organizational, social, and cultural changes during that period.
High performance communication networkssHemaDarshana
This document outlines the syllabus for a course on high performance communication networks. The course will cover layered architectures, broadband and IP networks, ATM networks, and high performance networking using WiMax and UWB. Specific topics that will be covered include networking principles, digitalization, layered architectures, broadband networks, IP networks, ATM networks, and high performance networking with WiMax and Ultra Wideband. The intended outcomes are for students to understand high performance computer network architectures, summarize network protocols, apply models to analyze networks, and explain WiMax and UWB architectures.
This document provides an overview of data communication and networking concepts. It discusses data communication elements like messages, senders, receivers, and protocols. It describes different data transmission methods including parallel and serial transmission. It also covers data transmission modes like simplex, half-duplex, and full-duplex. Additional topics covered include internet vs intranet, types of networks like LAN, MAN and WAN, network topologies, networking devices, OSI model, and TCP/IP.
Review Questions -11.Is web server an end system A. There is no.pdfanjanaarts2014
Review Questions -1
1.Is web server an end system ?
A. There is no difference between a host and an end system. In the internet, all devices are called
hosts and end systems. So, hosts and end systems are used interchangeably. The types of end
systems are PCs, Workstations, Web servers, email servers, PDAs, TVs, Cell Phones, Tablets,
etc
2. which service was invented first place them in order -web, first email
program,Ethernet,TCP/IP
A. 1980: Ethernet standard introduced
1982: TCP/IP protocol suite formalized
1991: World Wide Web (WWW)
1996: Hotmail free web-based e-mail
3. packet switching the store-and-forward feature why?
A. Prior to the deployment of the Internet, computers were connected via a variety of point-to-
point techniques, with many smaller computers using dial-up connections. The UUCP store-and-
forward protocols allowed a message (typically e-mail) to move across the collection of
computers and eventually reach its destination. Late in the 20th century, store and forward
techniques evolved into packet switching which replaced it for most purposes.
4. our internet has a full mesh topology true or false Why?
A.True, A mesh network is a local area network (LAN), wireless local area network (WLAN) or
virtual LAN (VLAN) that employs one of two decentralized connection arrangements: full mesh
topology or partial mesh topology. In a full mesh topology, each network node(workstation or
other device) is connected directly to each of the others. In a partial mesh topology, some nodes
are connected to all the others, but others are only connected to those nodes with which they
exchange the most data.
5. how many types of network delays? What are they?
A. Network delay is an important design and performance characteristic of a computer network
or telecommunications network. All of us want Internet and its services to be able to move as
much data as we want between two end users or hosts, instantaneously and without any loss of
data. Unfortunately, this is just an imaginary perception that is cannot be done in reality. Infact
computer networks necessarily introduce delays between hosts and can actually lose packets.
· Processing delay – time routers take to process the packet header
· Queuing delay – time the packet spends in routing queues
· Transmission delay – time it takes to push the packet\'s bits onto the link
· Propagation delay – time for a signal to reach its destination
6. what are the difference between transmission and propagation delay?
A. Propagation delay is the time taken by a bit(Mostly MSB ,Here 1) to reach from sender(A) to
receiver(B). Transmission Delay: This is the amount of time required to transmit all of the
packet\'s bits into the link. Transmission delays are typically on the order of microseconds or less
in practice
Propagation delay is how long it takes one bit to travel from one end of the \"wire\" to the other
(it\'s proportional to the length of the wire, crudely).
Transmission delay is how long it takes to.
Here are the key points about how mobility support for both the correspondent and mobile host would affect end-to-end delays:
- Datagrams would need to be tunneled through multiple home agents to reach the destination, adding additional encapsulation and forwarding hops.
- The path taken by a datagram would become more indirect as it travels through multiple home agents rather than direct host-to-host routing. This increases propagation and transmission delays.
- Additional processing is required at each home agent to encapsulate/decapsulate and forward the datagram, increasing processing delays.
- If either the mobile host or correspondent changes locations, their registrations with home agents and mobility bindings need to be updated, introducing additional
An Energy Efficient Protocol To Increase Network Life In WSNIOSR Journals
Abstract : Wireless Sensor Network consists of several sensor nodes, these nodes loss some of their energy after the process of communication. So an energy efficient approach is required to improve the life of the network. In case of broadcast network, LEACH protocol uses an aggregative approach by creating cluster of nodes. Now the major concern is to built such clusters over WSN in an optimized way. This work presents the improvement over LEACH protocol. Hence we have different work environments where the network is having different capacities. The proposed work shows how the life time of the network will improve when the number of nodes varies within the network. Keywords - LEACH, energy, lifetime, cluster based, WSN\
The document discusses packet switching networks and their topology at different levels from LANs to the Internet. Packet switching allows for connectionless and connection-oriented transfer of information. The network layer provides minimum services like routing and addressing to transport data between end systems. Switches like routers and bridges connect different networks and allow information to be shared globally.
Te 1 introduction to telecommunications_updatedShohan Ean
This document provides an overview of key concepts in telecommunications and computer networking. It discusses telecommunication systems, data communication models, transmission media, wide area networks, local area networks, and the Internet. Specific topics covered include circuit switching versus packet switching, frame relay, asynchronous transfer mode (ATM), Ethernet, TCP/IP, and the hierarchical structure of networks connecting end systems globally. Examples are provided to illustrate communication concepts and network elements.
Chapter 8 the role of networking in manufacturingN. A. Sutisna
This document discusses data communication and networking in manufacturing systems. It covers local area network concepts like topologies, protocols, and addressing. The most common high-level network topologies for manufacturing are bus structures and star networks. Bus networks offer flexibility in cable utilization but contention is an issue. Ring and star networks are also discussed along with techniques for resolving contention like CSMA/CD and token passing.
This document provides an introduction and overview of mobile ad hoc networks (MANETs). It discusses how MANETs are self-configuring networks formed by mobile nodes without a fixed infrastructure. The key characteristics of MANETs include using wireless communication, nodes acting as both hosts and routers, limited bandwidth and variable capacity links, energy-constrained operation, and dynamic network topology. The document also outlines some common applications of MANETs and provides an overview of different routing protocols used in MANETs, including proactive, reactive, and hybrid protocols. It gives a brief description of distance-vector and link-state routing approaches.
The OSI Reference Model describes a 7-layer network architecture developed by ISO to standardize network communication globally. It defines separate protocols for each layer to define tasks and responsibilities. The physical layer is responsible for sending bits between systems by defining encoding, transmission rates, and hardware details. The data link layer provides error checking, frame creation, and hardware addressing. The network layer establishes logical connections between systems, performs routing, handles addressing, and switches packets between networks.
The document discusses using a mathematical model to analyze how adding supplementary sensor nodes near base stations could increase network lifetime by reducing the energy burden on nodes closest to the base stations. The results show that for some networks, adding only a limited number of extra nodes could quadruple network lifetime. However, the potential gain depends heavily on the existing fraction of nodes near the base stations.
Spectrum Sharing between Cellular and Wi-Fi Networks based on Deep Reinforcem...IJCNCJournal
Recently, mobile traf ic is growing rapidly and spectrum resources are becoming scarce in wireless
networks. Due to this, the wireless network capacity will not meet the traf ic demand. To address this
problem, using cellular systems in an unlicensed spectrum emerged as an ef ective solution. In this case,
cellular systems need to coexist with Wi-Fi and other systems. For that, we propose an ef icient channel
assignment method for Wi-Fi AP and cellular NB, based on the DRL method. To train the DDQN model,
we implement an emulator as an environment for spectrum sharing in densely deployed NB and APs in
wireless heterogeneous networks. Our proposed DDQN algorithm improves the average throughput from
25.5% to 48.7% in dif erent user arrival rates compared to the conventional method. We evaluated the
generalization performance of the trained agent, to confirm channel allocation ef iciency in terms of
average throughput under the dif erent user arrival rates
Spectrum Sharing between Cellular and Wi-Fi Networks based on Deep Reinforcem...IJCNCJournal
Recently, mobile traffic is growing rapidly and spectrum resources are becoming scarce in wireless networks. Due to this, the wireless network capacity will not meet the traffic demand. To address this problem, using cellular systems in an unlicensed spectrum emerged as an effective solution. In this case, cellular systems need to coexist with Wi-Fi and other systems. For that, we propose an efficient channel assignment method for Wi-Fi AP and cellular NB, based on the DRL method. To train the DDQN model, we implement an emulator as an environment for spectrum sharing in densely deployed NB and APs in wireless heterogeneous networks. Our proposed DDQN algorithm improves the average throughput from 25.5% to 48.7% in different user arrival rates compared to the conventional method. We evaluated the generalization performance of the trained agent, to confirm channel allocation efficiency in terms of average throughput under the different user arrival rates.
The document contains a list of experiments related to computer networking. It includes 7 experiments covering topics like defining different types of LANs, WANs and MANs; describing network devices and topologies; implementing framing methods like bit stuffing, byte stuffing and character stuffing; and implementing routing algorithms such as simple redundancy check, cyclic redundancy check, checksum, and Hamming code. For each experiment, it provides details about the concepts and includes sample C code programs to demonstrate the techniques.
FellowBuddy.com is an innovative platform that brings students together to share notes, exam papers, study guides, project reports and presentation for upcoming exams.
We connect Students who have an understanding of course material with Students who need help.
Benefits:-
# Students can catch up on notes they missed because of an absence.
# Underachievers can find peer developed notes that break down lecture and study material in a way that they can understand
# Students can earn better grades, save time and study effectively
Our Vision & Mission – Simplifying Students Life
Our Belief – “The great breakthrough in your life comes when you realize it, that you can learn anything you need to learn; to accomplish any goal that you have set for yourself. This means there are no limits on what you can be, have or do.”
Like Us - https://www.facebook.com/FellowBuddycom
The transport layer in computer networking provides host-to-host communication services for applications. It provides functions like connection-oriented data streams, reliability, flow control, and multiplexing. Common transport layer protocols include TCP, UDP, SCTP, and SPX. The OSI transport layer defines five classes of connection-mode protocols: class 0 (unacknowledged mode), class 1 (acknowledged mode), class 2 (numbered mode), class 3 (alternate mode), and class 4 (unconfirmed mode).
A computer network is network of computer .It connects multiple computer in manner to enable meaningful transmission and exchange of data among them.Main objective of CN is sharing of information ,resources and processing load among the connected computer.
you can easily get basic introduction of COMPUTER NETWORK
KuberTENes Birthday Bash Guadalajara - K8sGPT first impressionsVictor Morales
K8sGPT is a tool that analyzes and diagnoses Kubernetes clusters. This presentation was used to share the requirements and dependencies to deploy K8sGPT in a local environment.
Harnessing WebAssembly for Real-time Stateless Streaming PipelinesChristina Lin
Traditionally, dealing with real-time data pipelines has involved significant overhead, even for straightforward tasks like data transformation or masking. However, in this talk, we’ll venture into the dynamic realm of WebAssembly (WASM) and discover how it can revolutionize the creation of stateless streaming pipelines within a Kafka (Redpanda) broker. These pipelines are adept at managing low-latency, high-data-volume scenarios.
An Approach for Enhanced Performance of Packet Transmission over Packet Switc...ijceronline
With the increased use of real time applications, there is a need for improved network traffic and bandwidth management. Switches are being used by computer networks for enabling connection between those hosts which are not connected by a direct link. When two or more than two host attempt to transmit packet at the same time, collision in data packets occurred. In this paper an optimized performance of local area network in terms of collision count and some other parameter have been investigated using simulation model. Simulation results have been obtained in different network scenarios by varying the number of devices in the network.
This white paper discusses protocol signaling procedures in LTE networks, including:
1) The LTE network architecture includes eNodeBs, MMEs, SGWs, and PGWs that facilitate communication between UEs and the core network.
2) UEs access the network through random access procedures and establish default bearers for connectivity.
3) System information broadcasting allows UEs to select networks and camp on cells, while tracking area updates allow UEs to update their locations.
4) Attach procedures register UEs on the network and allocate IP addresses, while detach procedures deregister UEs when no longer requiring service.
The document provides an overview of Janet Abbate's book "Inventing the Internet" which explores the history of the development of the Internet from 1959 to 1994. The book examines the social and cultural factors influencing the Internet's evolution from ARPANET to a global network. It analyzes how the Internet was shaped by collaboration and conflict between various players including government, military, computer scientists, and businesses. The author traces the technological development of the Internet and links it to organizational, social, and cultural changes during that period.
High performance communication networkssHemaDarshana
This document outlines the syllabus for a course on high performance communication networks. The course will cover layered architectures, broadband and IP networks, ATM networks, and high performance networking using WiMax and UWB. Specific topics that will be covered include networking principles, digitalization, layered architectures, broadband networks, IP networks, ATM networks, and high performance networking with WiMax and Ultra Wideband. The intended outcomes are for students to understand high performance computer network architectures, summarize network protocols, apply models to analyze networks, and explain WiMax and UWB architectures.
This document provides an overview of data communication and networking concepts. It discusses data communication elements like messages, senders, receivers, and protocols. It describes different data transmission methods including parallel and serial transmission. It also covers data transmission modes like simplex, half-duplex, and full-duplex. Additional topics covered include internet vs intranet, types of networks like LAN, MAN and WAN, network topologies, networking devices, OSI model, and TCP/IP.
Review Questions -11.Is web server an end system A. There is no.pdfanjanaarts2014
Review Questions -1
1.Is web server an end system ?
A. There is no difference between a host and an end system. In the internet, all devices are called
hosts and end systems. So, hosts and end systems are used interchangeably. The types of end
systems are PCs, Workstations, Web servers, email servers, PDAs, TVs, Cell Phones, Tablets,
etc
2. which service was invented first place them in order -web, first email
program,Ethernet,TCP/IP
A. 1980: Ethernet standard introduced
1982: TCP/IP protocol suite formalized
1991: World Wide Web (WWW)
1996: Hotmail free web-based e-mail
3. packet switching the store-and-forward feature why?
A. Prior to the deployment of the Internet, computers were connected via a variety of point-to-
point techniques, with many smaller computers using dial-up connections. The UUCP store-and-
forward protocols allowed a message (typically e-mail) to move across the collection of
computers and eventually reach its destination. Late in the 20th century, store and forward
techniques evolved into packet switching which replaced it for most purposes.
4. our internet has a full mesh topology true or false Why?
A.True, A mesh network is a local area network (LAN), wireless local area network (WLAN) or
virtual LAN (VLAN) that employs one of two decentralized connection arrangements: full mesh
topology or partial mesh topology. In a full mesh topology, each network node(workstation or
other device) is connected directly to each of the others. In a partial mesh topology, some nodes
are connected to all the others, but others are only connected to those nodes with which they
exchange the most data.
5. how many types of network delays? What are they?
A. Network delay is an important design and performance characteristic of a computer network
or telecommunications network. All of us want Internet and its services to be able to move as
much data as we want between two end users or hosts, instantaneously and without any loss of
data. Unfortunately, this is just an imaginary perception that is cannot be done in reality. Infact
computer networks necessarily introduce delays between hosts and can actually lose packets.
· Processing delay – time routers take to process the packet header
· Queuing delay – time the packet spends in routing queues
· Transmission delay – time it takes to push the packet\'s bits onto the link
· Propagation delay – time for a signal to reach its destination
6. what are the difference between transmission and propagation delay?
A. Propagation delay is the time taken by a bit(Mostly MSB ,Here 1) to reach from sender(A) to
receiver(B). Transmission Delay: This is the amount of time required to transmit all of the
packet\'s bits into the link. Transmission delays are typically on the order of microseconds or less
in practice
Propagation delay is how long it takes one bit to travel from one end of the \"wire\" to the other
(it\'s proportional to the length of the wire, crudely).
Transmission delay is how long it takes to.
Here are the key points about how mobility support for both the correspondent and mobile host would affect end-to-end delays:
- Datagrams would need to be tunneled through multiple home agents to reach the destination, adding additional encapsulation and forwarding hops.
- The path taken by a datagram would become more indirect as it travels through multiple home agents rather than direct host-to-host routing. This increases propagation and transmission delays.
- Additional processing is required at each home agent to encapsulate/decapsulate and forward the datagram, increasing processing delays.
- If either the mobile host or correspondent changes locations, their registrations with home agents and mobility bindings need to be updated, introducing additional
An Energy Efficient Protocol To Increase Network Life In WSNIOSR Journals
Abstract : Wireless Sensor Network consists of several sensor nodes, these nodes loss some of their energy after the process of communication. So an energy efficient approach is required to improve the life of the network. In case of broadcast network, LEACH protocol uses an aggregative approach by creating cluster of nodes. Now the major concern is to built such clusters over WSN in an optimized way. This work presents the improvement over LEACH protocol. Hence we have different work environments where the network is having different capacities. The proposed work shows how the life time of the network will improve when the number of nodes varies within the network. Keywords - LEACH, energy, lifetime, cluster based, WSN\
The document discusses packet switching networks and their topology at different levels from LANs to the Internet. Packet switching allows for connectionless and connection-oriented transfer of information. The network layer provides minimum services like routing and addressing to transport data between end systems. Switches like routers and bridges connect different networks and allow information to be shared globally.
Te 1 introduction to telecommunications_updatedShohan Ean
This document provides an overview of key concepts in telecommunications and computer networking. It discusses telecommunication systems, data communication models, transmission media, wide area networks, local area networks, and the Internet. Specific topics covered include circuit switching versus packet switching, frame relay, asynchronous transfer mode (ATM), Ethernet, TCP/IP, and the hierarchical structure of networks connecting end systems globally. Examples are provided to illustrate communication concepts and network elements.
Chapter 8 the role of networking in manufacturingN. A. Sutisna
This document discusses data communication and networking in manufacturing systems. It covers local area network concepts like topologies, protocols, and addressing. The most common high-level network topologies for manufacturing are bus structures and star networks. Bus networks offer flexibility in cable utilization but contention is an issue. Ring and star networks are also discussed along with techniques for resolving contention like CSMA/CD and token passing.
This document provides an introduction and overview of mobile ad hoc networks (MANETs). It discusses how MANETs are self-configuring networks formed by mobile nodes without a fixed infrastructure. The key characteristics of MANETs include using wireless communication, nodes acting as both hosts and routers, limited bandwidth and variable capacity links, energy-constrained operation, and dynamic network topology. The document also outlines some common applications of MANETs and provides an overview of different routing protocols used in MANETs, including proactive, reactive, and hybrid protocols. It gives a brief description of distance-vector and link-state routing approaches.
The OSI Reference Model describes a 7-layer network architecture developed by ISO to standardize network communication globally. It defines separate protocols for each layer to define tasks and responsibilities. The physical layer is responsible for sending bits between systems by defining encoding, transmission rates, and hardware details. The data link layer provides error checking, frame creation, and hardware addressing. The network layer establishes logical connections between systems, performs routing, handles addressing, and switches packets between networks.
The document discusses using a mathematical model to analyze how adding supplementary sensor nodes near base stations could increase network lifetime by reducing the energy burden on nodes closest to the base stations. The results show that for some networks, adding only a limited number of extra nodes could quadruple network lifetime. However, the potential gain depends heavily on the existing fraction of nodes near the base stations.
Spectrum Sharing between Cellular and Wi-Fi Networks based on Deep Reinforcem...IJCNCJournal
Recently, mobile traf ic is growing rapidly and spectrum resources are becoming scarce in wireless
networks. Due to this, the wireless network capacity will not meet the traf ic demand. To address this
problem, using cellular systems in an unlicensed spectrum emerged as an ef ective solution. In this case,
cellular systems need to coexist with Wi-Fi and other systems. For that, we propose an ef icient channel
assignment method for Wi-Fi AP and cellular NB, based on the DRL method. To train the DDQN model,
we implement an emulator as an environment for spectrum sharing in densely deployed NB and APs in
wireless heterogeneous networks. Our proposed DDQN algorithm improves the average throughput from
25.5% to 48.7% in dif erent user arrival rates compared to the conventional method. We evaluated the
generalization performance of the trained agent, to confirm channel allocation ef iciency in terms of
average throughput under the dif erent user arrival rates
Spectrum Sharing between Cellular and Wi-Fi Networks based on Deep Reinforcem...IJCNCJournal
Recently, mobile traffic is growing rapidly and spectrum resources are becoming scarce in wireless networks. Due to this, the wireless network capacity will not meet the traffic demand. To address this problem, using cellular systems in an unlicensed spectrum emerged as an effective solution. In this case, cellular systems need to coexist with Wi-Fi and other systems. For that, we propose an efficient channel assignment method for Wi-Fi AP and cellular NB, based on the DRL method. To train the DDQN model, we implement an emulator as an environment for spectrum sharing in densely deployed NB and APs in wireless heterogeneous networks. Our proposed DDQN algorithm improves the average throughput from 25.5% to 48.7% in different user arrival rates compared to the conventional method. We evaluated the generalization performance of the trained agent, to confirm channel allocation efficiency in terms of average throughput under the different user arrival rates.
The document contains a list of experiments related to computer networking. It includes 7 experiments covering topics like defining different types of LANs, WANs and MANs; describing network devices and topologies; implementing framing methods like bit stuffing, byte stuffing and character stuffing; and implementing routing algorithms such as simple redundancy check, cyclic redundancy check, checksum, and Hamming code. For each experiment, it provides details about the concepts and includes sample C code programs to demonstrate the techniques.
FellowBuddy.com is an innovative platform that brings students together to share notes, exam papers, study guides, project reports and presentation for upcoming exams.
We connect Students who have an understanding of course material with Students who need help.
Benefits:-
# Students can catch up on notes they missed because of an absence.
# Underachievers can find peer developed notes that break down lecture and study material in a way that they can understand
# Students can earn better grades, save time and study effectively
Our Vision & Mission – Simplifying Students Life
Our Belief – “The great breakthrough in your life comes when you realize it, that you can learn anything you need to learn; to accomplish any goal that you have set for yourself. This means there are no limits on what you can be, have or do.”
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you can easily get basic introduction of COMPUTER NETWORK
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5214-1693458878915-Unit 6 2023 to 2024 academic year assignment (AutoRecovere...
power proj33.pptx
1. Ministry Of Higher Education And Scientific Research
University of Diyala College of Engineering
Communications Engineering Department
Performance of Quantum Repeaters
For Mobile Networks
BY
Saba Hashem Hassan
Maryam Nihad Salem
Roaya Ali Abbas
Supervised By
Dr.Raad Subhi Abboud
3. Quantum Repeater Definition
They are devices that measure the quantum properties of photons when they arrive and
transmit these properties to new photons that are sent in the same direction, which
preserves entanglement and allows it to jump from one repeater to another. However,
this technology is still in its early experimental stages, and it will not enter into
commercial investment for several years Quantum repeaters work in a fundamentally
different way from conventional repeaters. Quantum repeaters are used to transmit
quantum information over long distances. In its simplest form, a quantum repeater works
by generating the entanglement (dashed line) between the repeater (middle) and each of
its (left and right) terminal nodes separately
4. So what is Quantum Teleportation and can it Be
Achieved?
This may sound like science fiction, but it’s a real method that involves transferring the
entire data into a quantum format. This approach is based on a quantum phenomenon
known as “entanglement”. Quantum teleportation is done by creating pairs of entangled
photons, then sending one of each pair to the data transmitter and the other to the
receiver. When Alice receives her entangled photon, she lets it interact with a “memory
qubit” that holds the data she wants to pass on to Bob
5. This interaction causes the state of her photon to change, and because it is
entangled with Bob’s photon, the interaction changes the state of his photon
instantly. In fact, this causes the data in Alice’s memory qubits to be “simulated”
from her photon to Bob’s photon. The graphic below illustrates the process with
some additional details
Figure 1 Achieved Quantum Teleportation
6. The Way The Quantum Repeater Works
The way the quantum repeaters work is conceptually similar to the classical repeating
scheme with amplifiers the transmission distance is divided into segments where the loss is
not large, as shown in the figure.
Figure 2 the Way the Quantum Repeater Works
7. Quantum Repeater Components
Components of a quantum repeater network:
1- the link layer : enumerates connections enabling entanglement between nodes in the
network
2- physical layer,
3- All adjacent stations are also connected by classical links
8. The quantum network comprises :
client nodes :which end users directly access, and repeater nodes, which connect clients
by propagating entanglement through the network. We classify repeater nodes based on
the number of other nodes they connect to: a 4-port and a 3-port repeater are labeled
Figure 3: Quantum Repeater Components
9. All of the quantum circuits in the experiments were designed using IBM’s open-
Source SDK – Quantum Information Science toolkit (QISKIT) in Python. The circuits
were run on IBMQ-16-Melbourne – a real quantum computing Device with 15
superconducting qubits, through back-end access via the cloud. After performing the
experiments, they were error-corrected using QISKIT’s Ignis library and its Error-
Mitigation protocols to remove the effects of measurement- Errors in the results. In
addition, the circuits were also simulated natively
Experiments And Results
10. Fig. 4: The Quantum Repeater scheme for generating long-range entanglement: It begins with splitting the
entire link into a number of segments and placing Repeater stations at these nodes. Multiple entangled pairs
are then generated between adjacent nodes. These shorter links are then purified and entanglement swapping is
performed to create a link twice as long as the original one. These new links are then purified and
entanglement swapping is performed again to create a link four times as long. This continues until
entanglement is generated between the end repeater nodes (Alice and Bob). QISKIT’s ‘QASM Simulator’
with a noise model from QISKIT’s Aer library that mimics the device-noise of IBMQ-16-Melbourne. The
simulation results Provide a reference point to which the device results can be compared
11. Quantum Bit
A qubit or qubit in quantum computing is the unit of quantum information, the
quantum equivalent of a classical bit. A qubit is a two-state quantum system like
the polarization of a photon: here the two states are vertical polarization and
horizontal polarization. In classical systems, a bit can only take one of two states.
Whereas, quantum mechanics allows a qubit to take on a superposition of both
states at the same moment, and this is the fundamental property of quantum
computing
12. Qubit states
Figure 5: Bloch ball to represent qubits
The pure qubit state is a linear superposition of the base state. This
means that a qubit can be represented as a linear combination of
𝛽|1
+
(1) |𝜓 = 𝛼|0
13. Entanglement
One important difference between a quantum bit and a classical bit is that several
qubits can exhibit quantum entanglement Entanglement is a non-local property that
allows a set of qubits to exhibit a higher correlation than is possible in classical
systems. Take, for example, two entangled qubits in the Bell case
1
2
|00 + |11
(
2
)
14. Figure 6 : Entanglement Swapping. Two EPR pairs are generatedand distributed: i) between a source
(Alice) and an intermedi-ate node (Quantum Repeater), and ii) between the intermediatenode and a
destination (Bob). By performing a BSM on theentangled particles at the Quantum Repeater,
entanglement iseventually generated between Alice and Bob
16. Definition OF LTE
In telecommunications, Long-Term Evolution (LTE) is a standard for wireless
broadband communication for mobile devices and data terminals, based on the
GSM/EDGE and UMTS/HSPA technologies. It increases the capacity and speed using
a different radio interface together with core network improvements LTE is the upgrade
path for carriers with both GSM/UMTS networks and CDMA2000 networks. The
different LTE frequencies and bands used in different countries mean that only multi-
band phones are able to use LTE in all countries where it is supported.
17. Is 4G The Same As LTE?
There is a misnomer we should get out of the way: LTE is not 4G. We can look to T-
Mobile as an example. They put 4G on everything they can, but make no claim to LTE.
The benchmark for 4G is also much higher than what we currently see with LTE. That
benchmark of 100Mbit/s is established by the International Telecommunications Union
(ITU) in cooperation with the 3GPP. To give a quick idea of how those measures up to
what you have now, 1000kbps is equal to 1Mbit/s. If you ran a benchmark test on your
phone and did the math, you’d see that the actual 4G standard is about 5-10 times faster
than what you probably see now with “LTE”.
18. In being fair, both GSM and CDMA have made some impressive improvements prior to
any LTE implementation. As GSM relies on moving parcels of information, the HSPA, or
high speed packet access, was the natural progression for them. The difference between
GSM and CDMA is that GSM moves packets of information while CDMA allows users to
“stream” information. Neither is necessarily better, they just operate differently. The
CDMA progression gave us CDMA EV-DO, which like HSPA just sped up the entire
process instead of changing anything. Carriers knew they needed a marketing strategy for
the system updates, so the ITU agreed to let them market it as 4G. Again, while it doesn’t
meet the benchmarks set forth by the ITU and 3GPP, it does represent a huge step forward.
Both agencies respect the advancements as significant, so they allowed them to use the
moniker.
19. How LTE Is Work
LTE changes the current way of transmitting data to the Internet Protocol system.
Instead of transmitting small amounts of data, as CDMA and GSM do, it will transmit
large packets of data and simplify service. Think of it as removing speed bumps from
the roads in your city so you can zoom in faster The main benefit of LTE is that it
reduces data latency i.e. LTE incorporates digital signal processing (DSP) to separate
into better packet data transmission. In short, LTE is a supercharger for your GSM or
CDMA car driving around a city free of speed bumps.
20. Figure 8: System architecture of the proposed PS-UA scheme in PS LTE
system
21. How Does LTE Affect You
First, think about your wallet. As we discussed earlier, we don’t technically have true
4G, but we’re paying for it. Again, pointing to Verizon, they really do have the best
network and the most LTE coverage… but you’re going to pay for it. Upgrading all
those towers and such isn’t free, and you’re really the carrier's only means of revenue.
So, if you want more speed, you’ll have to spend a little more money to get it.
Second, consider your needs. Our phones are pretty robust and will continue to improve,
but LTE is taxing. Faster data invariably means more data, as people will rely on their
mobile devices more and more. So, while really fast data speed is fun, it's also affecting
things like your battery. We don’t have much LTE coverage, and battery life is already an
issue.
22. How Fast Is LTE?
For starters, the quality and speed of your connection varies based on the number of users
and the strength of the signal in your area. According to research from Open Signal, the
leading 25 countries offer several 4G download speeds of 37Mbps with 10Mbps uploads.
The fastest 4G LTE countries boast up to 150 Mbps download speeds on average,
although that’s still a rarity for most consumers. For comparison, older 3G networks can
vary quite widely in their actual results. HSPA networks can peak at around 14 Mbps
download and 6 Mbps upload, but they rarely come close to this. Typically, a good LTE
network is at least 5 to 10 times faster than the best 3G coverage.
24. System Model
The performance of hybrid networks (classical - quantum) using quantum repeaters was
analyzed and compared with the bare quantum repeater network. In the distance, these
repeaters are removed and replaced with the classic base station. Several network metrics
were then evaluated modeling both quantum and hybrid networks, such as latency, data
rate, energy efficiency, scalability, power consumption, and implementation cost. The
results show that hybrid networks can provide faster connectivity, lower cost, lower
required operating cost and higher scalability. On the contrary, the bare quantum repeater
network showed higher data rate and higher power efficiency.
25. Power Consumption Model
To model the energy efficiency of the all quantum network, we first calculate the distance
that is required to be covered, then we calculate how many quantum or classical devices are
required to connect this distance. After that, the cost of both cases will be calculated, then the
energy efficiency. Hence, we have assumed 200Km of distance. For this distance, in all
quantum networks, we evaluate how many quantum repeaters, detectors, memories, central
units are required. In hybrid network, we will assume part of this distance is covered by
classical communications, hence we will add this consumption to the quantum part but
reducing the number of the quantum devices.