The document provides information on telecommunication systems and cellular networks. It discusses cellular network technologies like GSM and GPRS. It describes the key components of cellular networks including cells, frequency reuse, and different cellular system architectures. It provides details on the different subsystems (BSS, NSS, OSS) and components (BTS, BSC, MSC, HLR) that make up the GSM network architecture. It also explains cellular network concepts like roaming, handover, services provided (teleservices, bearer services, supplementary services) and GSM call setup procedures.
Cellular mobile communication uses multiple access methods like TDMA, FDMA, and CDMA to allow many users to access the network simultaneously over a limited wireless spectrum. It works by dividing geographic areas into cells served by base transceiver stations and switching centers, with cellular phones communicating with the nearest base station. When users move between cells, their communication is handed off seamlessly to the new base station through the switching network to maintain the connection.
UMTS (Universal Mobile Telecommunications System) is a 3G mobile communication system that offers high quality wireless multimedia services. It delivers information directly to users and provides access to new services and applications regardless of location, network, or terminal used. The UMTS architecture separates the core network from the radio access network. A UMTS mobile station can operate in PS/CS mode for simultaneous services, PS-only mode, or CS-only mode. UMTS has gone through several releases to support features like HSDPA and all-IP networking.
Wireless LAN technologies can be categorized based on their transmission technique. Infrared LANs use infrared light which does not penetrate walls but avoids interference. Spread spectrum LANs operate in unlicensed bands and can be configured in a hub or ad hoc topology. Narrowband microwave LANs can be licensed or unlicensed, with licensed providing guaranteed interference-free communication but requiring fees.
This document provides an overview of mobile communication and cellular technologies. It begins with learning objectives which are to refresh basics of cellular technologies, understand functioning in a cellular environment, and explain technical aspects of cellular telecommunications. The document then outlines the course agenda which will cover topics like access methods, multiple access techniques, mobile services, evolution of cellular communication standards like GSM and CDMA, cellular networks, and wireless data technologies. It dives into concepts like electromagnetic waves, frequency division multiple access, time division multiple access, duplexing, cellular architecture with frequency reuse, and elements of mobile communication systems.
The document discusses cognitive radio and its benefits. It defines cognitive radio as a radio that is aware of its surroundings and adapts intelligently. Cognitive radio provides a framework for devices to dynamically create links by sensing the environment, evaluating options, and implementing the best waveform. This allows for improved spectrum utilization and quality of service. Some applications of cognitive radio include extending mobile networks, emergency radio systems, and multi-technology phones.
Description and comparison of 3G, 4G and 5G Core Networks. You can find my detailed report in https://medium.com/@sarpkoksal/core-network-evolution-3g-vs-4g-vs-5g-7738267503c7
Cellular communication systems have evolved through multiple generations from analog 1G to digital 4G systems. A cellular network is divided into geographical areas called cells served by base transceiver stations. Cells are grouped into clusters where frequencies are reused to allow for more subscribers. When making a call, the cellular phone registers with the local base station which routes the call through switching centers to establish communication with the intended recipient. Modern cellular networks support additional services beyond voice like texting, internet access, and location tracking through technologies like GSM that employ protocols like TDMA for efficient frequency usage.
Cellular mobile communication uses multiple access methods like TDMA, FDMA, and CDMA to allow many users to access the network simultaneously over a limited wireless spectrum. It works by dividing geographic areas into cells served by base transceiver stations and switching centers, with cellular phones communicating with the nearest base station. When users move between cells, their communication is handed off seamlessly to the new base station through the switching network to maintain the connection.
UMTS (Universal Mobile Telecommunications System) is a 3G mobile communication system that offers high quality wireless multimedia services. It delivers information directly to users and provides access to new services and applications regardless of location, network, or terminal used. The UMTS architecture separates the core network from the radio access network. A UMTS mobile station can operate in PS/CS mode for simultaneous services, PS-only mode, or CS-only mode. UMTS has gone through several releases to support features like HSDPA and all-IP networking.
Wireless LAN technologies can be categorized based on their transmission technique. Infrared LANs use infrared light which does not penetrate walls but avoids interference. Spread spectrum LANs operate in unlicensed bands and can be configured in a hub or ad hoc topology. Narrowband microwave LANs can be licensed or unlicensed, with licensed providing guaranteed interference-free communication but requiring fees.
This document provides an overview of mobile communication and cellular technologies. It begins with learning objectives which are to refresh basics of cellular technologies, understand functioning in a cellular environment, and explain technical aspects of cellular telecommunications. The document then outlines the course agenda which will cover topics like access methods, multiple access techniques, mobile services, evolution of cellular communication standards like GSM and CDMA, cellular networks, and wireless data technologies. It dives into concepts like electromagnetic waves, frequency division multiple access, time division multiple access, duplexing, cellular architecture with frequency reuse, and elements of mobile communication systems.
The document discusses cognitive radio and its benefits. It defines cognitive radio as a radio that is aware of its surroundings and adapts intelligently. Cognitive radio provides a framework for devices to dynamically create links by sensing the environment, evaluating options, and implementing the best waveform. This allows for improved spectrum utilization and quality of service. Some applications of cognitive radio include extending mobile networks, emergency radio systems, and multi-technology phones.
Description and comparison of 3G, 4G and 5G Core Networks. You can find my detailed report in https://medium.com/@sarpkoksal/core-network-evolution-3g-vs-4g-vs-5g-7738267503c7
Cellular communication systems have evolved through multiple generations from analog 1G to digital 4G systems. A cellular network is divided into geographical areas called cells served by base transceiver stations. Cells are grouped into clusters where frequencies are reused to allow for more subscribers. When making a call, the cellular phone registers with the local base station which routes the call through switching centers to establish communication with the intended recipient. Modern cellular networks support additional services beyond voice like texting, internet access, and location tracking through technologies like GSM that employ protocols like TDMA for efficient frequency usage.
This document provides information about VSAT (Very Small Aperture Terminal) satellite networks. It defines VSAT as a two-way communication system between a satellite and ground station using a small dish antenna. It then describes VSAT remote terminal block diagrams, the importance of VSAT networks for connectivity, different VSAT configurations and topologies including star and mesh networks. It also summarizes the functions of a VSAT hub, common VSAT applications for broadcasting and interactive services, benefits of VSAT networks, and basic VSAT installation steps.
Cellular concepts and system design fundamentalsKamal Sharma
The document discusses the cellular concept which aims to increase capacity by replacing single high-power transmitters with multiple low-power transmitters, each covering a small cell. Key aspects covered include:
- Cells are allocated different channel groups to minimize interference between nearby base stations.
- A cellular system reuses the same set of channels in different cells through frequency planning and by assigning different channel groups to neighboring cells.
- Hexagonal cell shapes help maximize coverage while minimizing gaps and support efficient frequency reuse patterns.
- Techniques like cell splitting, sectoring, and microcells help increase capacity by reducing cell sizes and reusing frequencies.
The document discusses GSM (Global System for Mobile Communication), including its definition as a 2G cellular standard, system architecture with components like the mobile station, base station subsystem, and network subsystem, basic features like call waiting and advanced features like roaming, future developments like UMTS, and advantages like international roaming capabilities and efficient use of spectrum.
The document provides information on GSM (Global System for Mobile Communication) including:
- GSM was developed to standardize cellular networks in Europe and provide compatibility between systems.
- It uses TDMA and FDMA to allow multiple users to access the radio spectrum at the same time. Carriers are divided into time slots and frequency channels.
- The key components of GSM are the mobile station (phone), base station subsystem including base transceiver stations and base station controllers, switching subsystem including HLR, VLR and MSC, and operation subsystem for network management.
The document summarizes the history and technical standards of GSM cellular networks. It describes how GSM networks are structured hierarchically with mobile switching centers, location areas, and base station controllers. It also explains the key identifiers used in GSM including the IMSI, IMEI, MSISDN, and MSRN. The document concludes by covering the frequency division multiple access and time division multiple access techniques used in GSM as well as some inefficiencies in the standard.
This document provides an overview of the automatic calibration method in Atoll 3.1.2 for calibrating the Standard Propagation Model (SPM). It discusses pre-processing continuous wave (CW) measurement data, selecting calibration and verification stations, setting up the initial SPM model, and using the calibration wizard to calibrate the model parameters. The goal is to minimize errors between predicted and measured signal levels at calibration sites, with targets of less than 1 dB mean error and 8 dB standard deviation.
Handovers, also called handoffs, allow mobile users to maintain connectivity as they move between different cells. They involve transferring control of a call or data session from one cell to another. There are different types of handovers in GSM including intra-BTS, inter-BTS intra-BSC, inter-BSC, and inter-MSC handovers. Factors like transmitted power, received power, area and shape of cells, and user mobility affect the handover process.
The document discusses different types of handoffs in cellular networks including hard and soft handoffs. Hard handoffs involve disconnecting from the current base station before connecting to the new one, while soft handoffs allow the mobile device to connect to multiple base stations simultaneously during handoff. The document also describes different handoff protocols like network-controlled, mobile-assisted, and mobile-controlled handoffs which help provide continuous service quality during the transfer between base stations. Maintaining signal strength and proper cell structure design are important strategies for effective handoff management.
GPRS (General Packet Radio Service) improves on existing cellular data services by using a packet switched network rather than a circuit switched one. This allows for more efficient use of network resources and bandwidth. GPRS allows multiple users to share the same physical channel and users are billed based on the amount of data transferred rather than connection time. Maximum transfer rates are improved to 171.2 kbps.
05. Frequency Management and Channel Assignment.pdfsamiulsuman
This document discusses frequency management and channel assignment in cellular networks. It covers:
- Frequency management which includes designating setup and voice channels, numbering channels, and grouping voice channels into subsets.
- Channel assignment which allocates specific channels to cell sites on a long-term basis and mobile units on a short-term basis during calls.
- The original 666 channels were divided into blocks A and B, with setup channels in specific ranges and voice channels assigned to each block. Additional spectrum has since been added up to channel 1023.
IS-95 CDMA is an air interface standard that uses code division multiple access (CDMA). It employs various techniques to improve system capacity and performance, including bandwidth recycling, power control, soft handoffs, diversity combining, and variable rate vocoding. Key aspects of IS-95 include the use of quadrature phase shift keying modulation at a 1.2288 Mcps chip rate, forward error correction coding, and multiple logical channels (pilot, sync, paging, traffic) defined using orthogonal Walsh codes.
The document discusses TCP flow control using the sliding window protocol. It describes how the sliding window protocol allows multiple packets to be sent and confirmed with a single acknowledgment packet. This helps TCP dynamically adapt the transmission rate by reducing it during congestion and increasing it when congestion disappears. The size of the TCP window determines the number of acknowledgments sent during data transfer. The sliding window uses a congestion window and advertised window, where the congestion window sets the maximum number of outstanding segments and the advertised window is set by the receiver's buffer size.
The document provides information on the evolution of wireless networks from 1G to 3G. It discusses the key components and architecture of cellular systems including base stations, mobile switching centers and their connection to the public switched telephone network. It also compares the differences between wireless and wired networks, and describes some of the limitations of early wireless networking. Finally, it covers topics like traffic routing, circuit switching, packet switching and the X.25 protocol.
The document provides an overview of the Global System for Mobile communications (GSM) cellular network. It describes the history and development of GSM as a standardized digital cellular system to overcome issues with earlier analog systems. The key components of GSM include mobile stations containing a terminal and SIM card, a base station subsystem, a network and switching subsystem containing various registers and switches, and an operation and support subsystem. The document outlines the cellular structure using different cell types, and describes aspects of the GSM radio interface such as frequency allocation, multiple access, and processing from source information to radio waves.
This document discusses synchronization in mobile computing systems. It describes how data is replicated and distributed across mobile devices, personal computers, and remote servers. It then discusses various synchronization techniques used to maintain consistency between distributed copies of data, including one-way synchronization initiated by the server or client, two-way synchronization, and refresh synchronization. The document also covers domain-specific rules that govern how data is synchronized across different platforms and data formats.
This document describes radio transmission techniques and channels in GSM networks. It discusses Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), and Code Division Multiple Access (CDMA) and defines physical and logical channels. It provides details on different control channels like Broadcast Control Channel (BCCH), Common Control Channel (CCCH), and Dedicated Control Channel (DCCH). It also describes traffic channels and various burst types used in GSM frames.
Wireless local loop (WLL) provides wireless connections for stationary users as an alternative to wired connections. It targets the "last mile" between a neighborhood access point and end users. Key advantages include lower installation costs than wiring due to reduced digging and infrastructure requirements, as well as rapid deployment. WLL systems face challenges around spectrum licensing, maintaining wireline-level service quality, and planning networks to achieve high penetration levels while supporting limited user mobility within coverage areas. Common WLL technologies include cellular, satellite, and fixed wireless access using licensed or unlicensed spectrum.
Cellular wireless networks use three basic devices: a mobile station, base transceiver, and mobile switching office. The base transceiver includes an antenna and controller. The switching office connects calls between mobile units. Two channel types are available: control channels for call setup/maintenance, and traffic channels that carry voice/data. Cells use low-powered transmitters and each cell has its own antenna and base station. Frequency reuse allows the same frequencies to be used in different cells. As users move between cells, handoffs change their assignment from one base station to another.
- GSM is a standard for 2G digital cellular networks that uses narrowband TDMA. It describes protocols for features like GPRS, EDGE, authentication, encryption, and more.
- The GSM architecture consists of mobile equipment (handsets), a base station subsystem for radio network management, a network switching subsystem for call routing, and a network management subsystem.
- Key aspects include the SIM card for user identification, base transceiver stations for radio signals, transcoding between speech formats, home and visitor location registers for subscriber data, and authentication/equipment databases.
- GSM is a standard for 2G digital cellular networks that uses narrowband TDMA. It describes protocols for features like GPRS, EDGE, authentication, encryption, and more.
- The GSM architecture consists of mobile equipment (handsets), a base station subsystem for radio network management, a network switching subsystem for call routing, and a network management subsystem.
- Key aspects include the SIM card for user identification, base transceiver stations for radio signals, transcoding between speech formats, home and visitor location registers for subscriber data, and authentication centers for security.
This document provides information about VSAT (Very Small Aperture Terminal) satellite networks. It defines VSAT as a two-way communication system between a satellite and ground station using a small dish antenna. It then describes VSAT remote terminal block diagrams, the importance of VSAT networks for connectivity, different VSAT configurations and topologies including star and mesh networks. It also summarizes the functions of a VSAT hub, common VSAT applications for broadcasting and interactive services, benefits of VSAT networks, and basic VSAT installation steps.
Cellular concepts and system design fundamentalsKamal Sharma
The document discusses the cellular concept which aims to increase capacity by replacing single high-power transmitters with multiple low-power transmitters, each covering a small cell. Key aspects covered include:
- Cells are allocated different channel groups to minimize interference between nearby base stations.
- A cellular system reuses the same set of channels in different cells through frequency planning and by assigning different channel groups to neighboring cells.
- Hexagonal cell shapes help maximize coverage while minimizing gaps and support efficient frequency reuse patterns.
- Techniques like cell splitting, sectoring, and microcells help increase capacity by reducing cell sizes and reusing frequencies.
The document discusses GSM (Global System for Mobile Communication), including its definition as a 2G cellular standard, system architecture with components like the mobile station, base station subsystem, and network subsystem, basic features like call waiting and advanced features like roaming, future developments like UMTS, and advantages like international roaming capabilities and efficient use of spectrum.
The document provides information on GSM (Global System for Mobile Communication) including:
- GSM was developed to standardize cellular networks in Europe and provide compatibility between systems.
- It uses TDMA and FDMA to allow multiple users to access the radio spectrum at the same time. Carriers are divided into time slots and frequency channels.
- The key components of GSM are the mobile station (phone), base station subsystem including base transceiver stations and base station controllers, switching subsystem including HLR, VLR and MSC, and operation subsystem for network management.
The document summarizes the history and technical standards of GSM cellular networks. It describes how GSM networks are structured hierarchically with mobile switching centers, location areas, and base station controllers. It also explains the key identifiers used in GSM including the IMSI, IMEI, MSISDN, and MSRN. The document concludes by covering the frequency division multiple access and time division multiple access techniques used in GSM as well as some inefficiencies in the standard.
This document provides an overview of the automatic calibration method in Atoll 3.1.2 for calibrating the Standard Propagation Model (SPM). It discusses pre-processing continuous wave (CW) measurement data, selecting calibration and verification stations, setting up the initial SPM model, and using the calibration wizard to calibrate the model parameters. The goal is to minimize errors between predicted and measured signal levels at calibration sites, with targets of less than 1 dB mean error and 8 dB standard deviation.
Handovers, also called handoffs, allow mobile users to maintain connectivity as they move between different cells. They involve transferring control of a call or data session from one cell to another. There are different types of handovers in GSM including intra-BTS, inter-BTS intra-BSC, inter-BSC, and inter-MSC handovers. Factors like transmitted power, received power, area and shape of cells, and user mobility affect the handover process.
The document discusses different types of handoffs in cellular networks including hard and soft handoffs. Hard handoffs involve disconnecting from the current base station before connecting to the new one, while soft handoffs allow the mobile device to connect to multiple base stations simultaneously during handoff. The document also describes different handoff protocols like network-controlled, mobile-assisted, and mobile-controlled handoffs which help provide continuous service quality during the transfer between base stations. Maintaining signal strength and proper cell structure design are important strategies for effective handoff management.
GPRS (General Packet Radio Service) improves on existing cellular data services by using a packet switched network rather than a circuit switched one. This allows for more efficient use of network resources and bandwidth. GPRS allows multiple users to share the same physical channel and users are billed based on the amount of data transferred rather than connection time. Maximum transfer rates are improved to 171.2 kbps.
05. Frequency Management and Channel Assignment.pdfsamiulsuman
This document discusses frequency management and channel assignment in cellular networks. It covers:
- Frequency management which includes designating setup and voice channels, numbering channels, and grouping voice channels into subsets.
- Channel assignment which allocates specific channels to cell sites on a long-term basis and mobile units on a short-term basis during calls.
- The original 666 channels were divided into blocks A and B, with setup channels in specific ranges and voice channels assigned to each block. Additional spectrum has since been added up to channel 1023.
IS-95 CDMA is an air interface standard that uses code division multiple access (CDMA). It employs various techniques to improve system capacity and performance, including bandwidth recycling, power control, soft handoffs, diversity combining, and variable rate vocoding. Key aspects of IS-95 include the use of quadrature phase shift keying modulation at a 1.2288 Mcps chip rate, forward error correction coding, and multiple logical channels (pilot, sync, paging, traffic) defined using orthogonal Walsh codes.
The document discusses TCP flow control using the sliding window protocol. It describes how the sliding window protocol allows multiple packets to be sent and confirmed with a single acknowledgment packet. This helps TCP dynamically adapt the transmission rate by reducing it during congestion and increasing it when congestion disappears. The size of the TCP window determines the number of acknowledgments sent during data transfer. The sliding window uses a congestion window and advertised window, where the congestion window sets the maximum number of outstanding segments and the advertised window is set by the receiver's buffer size.
The document provides information on the evolution of wireless networks from 1G to 3G. It discusses the key components and architecture of cellular systems including base stations, mobile switching centers and their connection to the public switched telephone network. It also compares the differences between wireless and wired networks, and describes some of the limitations of early wireless networking. Finally, it covers topics like traffic routing, circuit switching, packet switching and the X.25 protocol.
The document provides an overview of the Global System for Mobile communications (GSM) cellular network. It describes the history and development of GSM as a standardized digital cellular system to overcome issues with earlier analog systems. The key components of GSM include mobile stations containing a terminal and SIM card, a base station subsystem, a network and switching subsystem containing various registers and switches, and an operation and support subsystem. The document outlines the cellular structure using different cell types, and describes aspects of the GSM radio interface such as frequency allocation, multiple access, and processing from source information to radio waves.
This document discusses synchronization in mobile computing systems. It describes how data is replicated and distributed across mobile devices, personal computers, and remote servers. It then discusses various synchronization techniques used to maintain consistency between distributed copies of data, including one-way synchronization initiated by the server or client, two-way synchronization, and refresh synchronization. The document also covers domain-specific rules that govern how data is synchronized across different platforms and data formats.
This document describes radio transmission techniques and channels in GSM networks. It discusses Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), and Code Division Multiple Access (CDMA) and defines physical and logical channels. It provides details on different control channels like Broadcast Control Channel (BCCH), Common Control Channel (CCCH), and Dedicated Control Channel (DCCH). It also describes traffic channels and various burst types used in GSM frames.
Wireless local loop (WLL) provides wireless connections for stationary users as an alternative to wired connections. It targets the "last mile" between a neighborhood access point and end users. Key advantages include lower installation costs than wiring due to reduced digging and infrastructure requirements, as well as rapid deployment. WLL systems face challenges around spectrum licensing, maintaining wireline-level service quality, and planning networks to achieve high penetration levels while supporting limited user mobility within coverage areas. Common WLL technologies include cellular, satellite, and fixed wireless access using licensed or unlicensed spectrum.
Cellular wireless networks use three basic devices: a mobile station, base transceiver, and mobile switching office. The base transceiver includes an antenna and controller. The switching office connects calls between mobile units. Two channel types are available: control channels for call setup/maintenance, and traffic channels that carry voice/data. Cells use low-powered transmitters and each cell has its own antenna and base station. Frequency reuse allows the same frequencies to be used in different cells. As users move between cells, handoffs change their assignment from one base station to another.
- GSM is a standard for 2G digital cellular networks that uses narrowband TDMA. It describes protocols for features like GPRS, EDGE, authentication, encryption, and more.
- The GSM architecture consists of mobile equipment (handsets), a base station subsystem for radio network management, a network switching subsystem for call routing, and a network management subsystem.
- Key aspects include the SIM card for user identification, base transceiver stations for radio signals, transcoding between speech formats, home and visitor location registers for subscriber data, and authentication/equipment databases.
- GSM is a standard for 2G digital cellular networks that uses narrowband TDMA. It describes protocols for features like GPRS, EDGE, authentication, encryption, and more.
- The GSM architecture consists of mobile equipment (handsets), a base station subsystem for radio network management, a network switching subsystem for call routing, and a network management subsystem.
- Key aspects include the SIM card for user identification, base transceiver stations for radio signals, transcoding between speech formats, home and visitor location registers for subscriber data, and authentication centers for security.
This document provides an overview of module 2 which focuses on GSM mobile services and cellular architecture. It discusses the basic concepts and principles of computing and cellular infrastructure including system architecture, radio interface, protocols, localization, calling, handover and security. It provides details on the GSM system infrastructure, components, protocols and interfaces. It also discusses GPRS system and protocol architecture, UTRAN, UMTS core network and improvements to the core network.
1. The document discusses various topics related to mobile communication and networks including definitions of key terms like base station, control channel, and handoff.
2. It explains concepts like frequency reuse, which allows the same set of frequencies to be reused in different cells by limiting each cell's coverage area.
3. Channel assignment strategies and handoff strategies are covered, distinguishing between fixed and dynamic channel assignment and soft and hard handoffs.
4. Propagation models are summarized, including free space propagation models which predict signal strength over large transmitter-receiver distances with clear line of sight.
History, Basic concepts of wireless communication, challenges in wireless communication, cellular communication, performance criteria, wireless communication standars, how call is made?
Cellular Networks Presentation in distributed systems, Mobile NetworksAhmad Yar
A cellular network or mobile network is a communication network where the last link is wireless. ..... of the Asia Pacific region · List of mobile network operators of the Middle East and Africa · List of mobile network operators (summary).
Cellular networks allow for mobile communication by dividing geographic areas into multiple "cells" served by base stations. This allows for frequency reuse which increases system capacity. Cellular networks have evolved through multiple generations with improvements in data transmission capabilities and bandwidth. Key aspects of cellular networks include frequency division duplexing, time division duplexing, and multiple access techniques like frequency division multiple access, time division multiple access, and code division multiple access which allow for sharing of bandwidth among users.
1. Cellular networks use multiple base stations that transmit and receive from mobile devices using assigned frequencies to allow frequency reuse and increase both coverage and capacity.
2. Multiple access schemes like FDMA, TDMA, and CDMA allow multiple users to access the network simultaneously by dividing the available bandwidth.
3. Generations of cellular networks have increased capabilities with 2G supporting digital signals and data, 3G allowing faster data rates including video calls, and 4G providing high-speed multimedia access.
Mobile computing systems allow computing capabilities to be used while moving. They have four key aspects: the mobile user, mobile device, mobile applications, and mobile network. Personal Communication Services (PCS) provide wireless access and personal mobility services through small terminals to enable communication anywhere and anytime. The basic PCS architecture consists of a radio network with mobile stations, base stations, and base station controllers/radio ports connected to a wireline transport network with mobile switching centers. Mobility management ensures network functionality as users move through location registration, tracking, and handoff between base stations.
This document provides a summary of lectures on cellular networks given at the Department of Electrical Engineering at University of Qatar. It discusses the basics of cellular networks including multiple access techniques used like FDMA, TDMA, and CDMA. It describes the evolution of cellular technologies from 1G to 4G including GSM, 3G, HSPA, and LTE. Key aspects covered include network architecture, frequency bands, protocols, and mobility management in cellular systems.
Lectures on 2 g,3g,3.5g,4g By Professor Dr Arshad Abbas KhanProfArshadAbbas
This document provides a summary of lectures on cellular networks given at the Department of Electrical Engineering at University of Qatar. It discusses the basics of cellular networks including frequency bands used, multiple access techniques like FDMA, TDMA, and CDMA. It describes the evolution of cellular technologies from 1G to 4G including GSM, 3G UMTS, HSPA 3.5G, and LTE 4G. Key aspects of these technologies like their network architecture, protocols, and frequency spectrums are summarized. The document concludes with a case study on the impact of user mobility on bandwidth sharing in HSPA networks for mobile users on public transportation.
The document provides an overview of personal communications services (PCS) and cellular networks. It describes PCS as enabling wireless communications anywhere through mobile devices connected to small cellular networks. Popular cellular standards like GSM, CDMA, and DAMPS are discussed along with their evolution from 1G to 2G to 3G networks supporting higher data rates and multimedia. The typical architecture of a cellular network is outlined, including mobile stations, base stations, switching centers, and integration with the public switched telephone network.
The document provides an introduction to the Global System for Mobile Communications (GSM) network. It discusses key aspects of GSM including that it is a digital cellular network using radio frequencies between 890-960 MHz and 1710-1880 MHz. It also describes the basic components of a GSM network including mobile stations, base station controllers, mobile switching centers, databases, and their functions.
The document provides an overview of mobile cellular networks from 1G to 4G technologies. It discusses the basics of cellular networks including frequency bands, cells, and handoffs. It then describes the multiple access schemes used in different generations including FDMA in 1G, TDMA in 2G, and CDMA in 3G. It provides details on 2G GSM network standards, protocols, and architecture. It also summarizes the evolution from 2G to 3G UMTS and 3.5G HSPA networks as well as the 4G LTE technology including its advantages over previous standards.
GSM is a 2G mobile communication system that provides voice and data services. It uses TDMA and FDMA to allow multiple users to access the network simultaneously. The key components of a GSM network are the radio subsystem including the BTS, BSC and MS; the network and switching subsystem including the MSC, HLR, VLR; and the operation subsystem including the OMC, AuC and EIR. GSM provides services like telephony, SMS, and data transmission using bearer channels while ensuring security, anonymity and authentication of users.
Mobile networks use radio frequencies to allow cellular devices to connect to a network of base stations. Base stations transmit and receive signals within assigned frequency bands to serve mobile terminals in a given coverage area. As terminals move between areas covered by different base stations, the network performs handoffs to transfer service to the closest base station. A study measured the impact of mobility on HSPA networks, finding that mobility reduced available bandwidth for users on public transportation due to increased handoffs and interference between cells.
Mobile networks use radio frequencies to allow cellular devices to connect to a network of base stations. Base stations transmit and receive signals in frequency bands between 850-1900 MHz. As devices move between base station coverage areas, the network performs handoffs to transfer the connection seamlessly. Higher generations of cellular networks like 3G and 4G provide improved data speeds but still must handle user mobility effectively.
Mobile networks use radio frequencies to allow cellular devices to connect to a network of base stations. Base stations transmit and receive signals within assigned frequency bands to serve mobile terminals in a given coverage area. As terminals move between areas covered by different base stations, the network performs handoffs to transfer service to the closest base station. A study measured the impact of mobility on HSPA networks, finding that mobility reduced available bandwidth for users on public transportation due to increased handoffs and interference between cells.
The document discusses cellular network basics and the evolution of cellular network generations from 0G to 4G. It covers key aspects of 2G cellular networks including GSM standards, channels, frequencies, architecture involving mobile stations, base station subsystems, switching subsystems, and location and handoff procedures. It also provides an overview of 3G networks and the transition from 2G technologies like GSM to 3G standards like UMTS, discussing services and performance improvements with each generation.
Mobile networks use radio frequencies to allow cellular devices to connect to a network of base stations. Base stations transmit and receive signals within assigned frequency bands to serve mobile terminals in a given coverage area. As terminals move between areas covered by different base stations, the network performs handoffs to transfer service to the closest base station. This study examines how mobility on public transportation impacts the performance of HSPA cellular networks in delivering bandwidth-intensive applications to mobile users.
The document provides information on client-side programming and CSS. It defines client-side programming as code that runs in the browser and deals with the user interface. Some key points made about CSS include:
- CSS stands for Cascading Style Sheets and describes how HTML elements are displayed.
- There are three ways to insert CSS - external, internal, and inline stylesheets. CSS selectors are used to target specific elements for styling.
- The document discusses various CSS properties including colors, backgrounds, and adding background images. Color values can be defined using hexadecimal, RGB, and other notation.
This document discusses server-side programming and servlets. It defines a web application as an application accessible from the web, composed of web components like servlets that execute on the web server. It describes CGI technology and its disadvantages. It then discusses server-side scripting, why server-side programming is important for enterprise applications, and the advantages it provides over client-side programming. The document outlines different types of server-side programs and provides details on servlets, the servlet container, servlet API, and the servlet lifecycle.
AJAX and web services allow for asynchronous communication between client and server without reloading pages. AJAX uses a combination of technologies like XML, JavaScript, and XMLHttpRequest to asynchronously update parts of a web page via the XMLHttpRequest object. It allows sending and receiving data from the server in the background. Web services allow applications to communicate over a network through standards-based web protocols like SOAP and REST. Key components of web services include SOAP, WSDL, and UDDI.
The document discusses the Document Object Model (DOM) and how it allows programs and scripts to dynamically access and update the content, structure, and style of an HTML or XML document. It defines the DOM as a standard set by the W3C. The document then discusses the DOM for HTML documents (HTML DOM) and how it defines HTML elements as objects and provides properties and methods to access and modify those elements. It also discusses DOM events and how they allow JavaScript to add event handlers to HTML elements for user interactions.
The document provides information about ad-hoc networks, including their characteristics, applications, design issues, and routing protocols. Some key points:
- Ad-hoc networks are infrastructure-less and use multi-hop wireless links between mobile nodes, requiring distributed routing protocols. They are suitable for situations requiring quick deployment like emergencies or military operations.
- Challenges for routing in ad-hoc networks include the dynamic topology, limited bandwidth and energy of nodes, and lack of a centralized entity. Traditional link-state and distance-vector routing protocols are examined.
- Popular link-state protocols like OSPF work by flooding link-state information to build a shared topology database and calculate the shortest path tree
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- **Computer Networks**: TDM is used in network protocols and systems to manage the transmission of data from multiple sources over a single network medium.
### Advantages of TDM
- **Efficient Use of Bandwidth**: TDM all
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2. TELECOMMUNICATION SYSTEM
Unit – 3
• Cellular Mobile communication- Global
System for Mobile Communication (GSM) -
General Packet Radio Service (GPRS) -
Generation of Mobile communication - SDR.
3. Introduction to Cellular Systems
• Cellular network is an underlying technology
for mobile phones, personal communication
systems, wireless networking etc
• The technology is developed for mobile radio
telephone to replace high power
transmitter/receiver systems.
• Cellular networks use lower power, long range
and more transmitters for data transmission.
4. Features of Cellular Systems
• The features of cellular systems are as follows −
• Offer very high capacity in a limited spectrum.
• Reuse of radio channel in different cells.
• Enable a fixed number of channels to serve an arbitrarily
large number of users by reusing the channel throughout
the coverage region.
• Communication is always between mobile and base station
(not directly between mobiles).
• Each cellular base station is allocated a group of radio
channels within a small geographic area called a cell.
• Neighboring cells are assigned different channel groups.
5. • By limiting the coverage area to within the
boundary of the cell, the channel groups may
be reused to cover different cells.
• Keep interference levels within tolerable
limits.
• Frequency reuse or frequency planning.
• Organization of Wireless Cellular Network.
• Cellular network is organized into multiple low
power transmitters each 100w or less.
6. Shape of Cells
• The coverage area of cellular networks are
divided into cells, each cell having its own
antenna for transmitting the signals.
• Each cell has its own frequencies. Data
communication in cellular networks is served
by its base station transmitter, receiver and
its control unit
• The shape of cells can be hexagon
7.
8. • Frequency Reuse
• Frequency reusing is the concept of using the same radio
frequencies within a given area, that are separated by considerable
distance, with minimal interference, to establish communication.
• Frequency reuse offers the following benefits −
• Allows communications within cell on a given frequency
• Limits escaping power to adjacent cells
• Allows re-use of frequencies in nearby cells
• Uses same frequency for multiple conversations
• 10 to 50 frequencies per cell
• For example, when N cells are using the same number of
frequencies and K be the total number of frequencies used in
systems. Then each cell frequency is calculated by using the
formulae K/N.
• In Advanced Mobile Phone Services (AMPS) when K = 395 and N =
7, then frequencies per cell on an average will be 395/7 = 56.
Here, cell frequency is 56.
9. BASIC CELLULAR SYSTEMS
The two basic cellular systems are
• Circuit-switched system
• Packet-switched system
10. FEATURES CIRCUIT SWITCHING PACKET SWITCHING
Orientation Connection oriented Connectionless
Purpose Initially designed for Voice
communication
Initially designed for Data
Transmission
Flexibility Inflexible, because once a path is
set all parts of a transmission
follows the same path
Flexible, because a route is
created for each packet to travel
to the destination
Order Message is received in the order,
sent from the source
Packets of a message are
received out of order and
assembled at the destination
Technology/
Approach
Circuit switching can be achieved
using two technologies, either
Space Division Switching or Time-
Division Switching
Packet Switching has two
approaches Datagram Approach
and Virtual Circuit Approach
11. Layers Circuit Switching is implemented at
Physical Layer
Packet Switching is implemented
at Network Layer
Resource Resource reservation is the feature
of circuit switching because path is
fixed for data transmission.
There is no resource reservation
because bandwidth is shared
among users.
Wastage Wastage of resources are more in
Circuit Switching
Less wastage of resources as
compared to Circuit Switching
Reliability More reliable Less reliable
12. GSM
• GSM is a mobile communication modem
• it is stands for global system for mobile
communication (GSM). The idea of GSM was
developed at Bell Laboratories in 1970.
• Presently GSM supports more than one billion
mobile subscribers in more than 210 countries
throughout the world.
• It is a digital cellular technology used for
transmitting mobile voice and data services.
13. • GSM owns a market share of more than 70
percent of the world's digital cellular
subscribers.
• GSM makes use of narrowband Time Division
Multiple Access (TDMA) technique for
transmitting signals.
• GSM was developed using digital technology.
It has an ability to carry 64 kbps to 120 Mbps
of data rates.
14. Why GSM?
• Listed below are the features of GSM that
account for its popularity and wide acceptance.
• Improved spectrum efficiency
• International roaming
• Low-cost mobile sets and base stations (BSs)
• High-quality speech
• Compatibility with Integrated Services Digital
Network (ISDN) and other telephone company
services
• Support for new services
15. • MS Mobile Station = phone + SIM card
• BTS Base Transceiver Station
• BSC Base Station Controller
• HLR Home Location Register
• MSC Mobile services Switching Centre
• VLR Visitor Location Register
• AUC Authentication Centre
• EIR Equipment Identity Register
• SMSC Short Message Service ”Support”
Centre
16. • VMS Voice Messaging System
• IN Intelligent Network services
• PSTN Public Switched Telephone Network
• PABX Private Automatic Branch Exchange
20. Teleservices
GSM provides both the voice oriented
teleservices and the non voice teleservices
• Voice calls
• Video Calls
• Short Text Messages
• Fax
• Emergency number
21. Bearer Services
• Send and receive data from mobile phone
• This services supporting SMS, e-mail, and
internet access
• Data rates up to 9.6 kbps.
22. Supplementary services
• Supplementary services are additional
services that are provided in addition to
teleservices and bearer services.
• These services include caller identification, call
forwarding, call waiting, multi-party
conversations, and barring of outgoing
(international) calls, among others
23. • Conferencing : It allows a mobile subscriber to
establish a multiparty conversation, i.e., a
simultaneous conversation between three or
more subscribers to setup a conference call.
This service is only applicable to normal
telephony
• Call Waiting : This service notifies a mobile
subscriber of an incoming call during a
conversation. The subscriber can answer,
reject, or ignore the incoming call
• Call Barring : Stop incoming calls from
undesired numbers.
24. • Call Hold : This service allows a subscriber to
put an incoming call on hold and resume after
a while. The call hold service is applicable to
normal telephony
• Call Forwarding : Call Forwarding is used to
divert calls from the original recipient to
another number. It is normally set up by the
subscriber himself. It can be used by the
subscriber to divert calls from the Mobile
Station when the subscriber is not available,
and so to ensure that calls are not lost
25. GSM architecture is mainly divided into three
Subsystems
1. Base Station Subsystem (BSS)
2. Network & Switching Subsystem (NSS)
3. Operations Subsystem (OSS)
GSM SYSTEM ARCHITECTURE
26.
27. • GSM - The Base Station Subsystem (BSS)
• The BSS is composed of two parts −
• The Base Transceiver Station (BTS)
• The Base Station Controller (BSC)
• The Base Transceiver Station (BTS)
• The BTS houses the radio transceivers that
define a cell and handles the radio link
protocols with the MS. In a large urban area, a
large number of BTSs may be deployed.
28. • The BTS corresponds to the transceivers and antennas used in each
cell of the network.
• A BTS is usually placed in the center of a cell. Its transmitting power
defines the size of a cell.
• Each BTS has between 1 and 16 transceivers, depending on the
density of users in the cell.
• Each BTS serves as a single cell. It also includes the following
functions −
• Encoding, encrypting, multiplexing, modulating, and feeding the RF
signals to the antenna
• Transcoding and rate adaptation
• Time and frequency synchronizing
• Voice through full- or half-rate services
• Decoding, decrypting, and equalizing received signals
• Random access detection
• Timing advances
• Uplink channel measurements
29. The Base Station Controller (BSC)
• The BSC manages the radio resources for one
or more BTSs. It handles radio channel setup,
frequency hopping, and handovers. The BSC is
the connection between the mobile and the
MSC.
• The BSC also translates the 13 Kbps voice
channel used over the radio link to the
standard 64 Kbps channel used by the Public
Switched Telephone Network (PSDN) or ISDN.
30. • It assigns and releases frequencies and time slots for
the MS. The BSC also handles intercell handover. It
controls the power transmission of the BSS and MS in
its area.
• The function of the BSC is to allocate the necessary
time slots between the BTS and the MSC. It is a
switching device that handles the radio resources.
• The additional functions include−
• Control of frequency hopping
• Performing traffic concentration to reduce the number
of lines from the MSC
• Providing an interface to the Operations and
Maintenance Center for the BSS
• Reallocation of frequencies among BTSs
• Time and frequency synchronization
31. GSM - The Network Switching
Subsystem (NSS)
• The Network switching system (NSS), the main
part of which is the Mobile Switching Center
(MSC), performs the switching of calls
between the mobile and other fixed or mobile
network users, as well as the management of
mobile services such as authentication
32. • Home Location Register (HLR)
• The HLR is a database used for storage and management of
subscriptions.
• The HLR is considered the most important database, as it stores
permanent data about subscribers, including a subscriber's service
profile, location information, and activity status.
• When an individual buys a subscription in the form of SIM, then all
the information about this subscription is registered in the HLR of
that operator.
• Mobile Services Switching Center (MSC)
• The central component of the Network Subsystem is the MSC.
• The MSC performs the switching of calls between the mobile and
other fixed or mobile network users, as well as the management of
mobile services such as registration, authentication, location
updating, handovers, and call routing to a roaming subscriber.
• It also performs such functions as toll ticketing, network interfacing,
common channel signaling, and others.
• Every MSC is identified by a unique ID.
33. • Visitor Location Register (VLR)
• The VLR is a database that contains temporary
information about subscribers that is needed by
the MSC in order to service visiting subscribers.
• The VLR is always integrated with the MSC. When
a mobile station roams into a new MSC area, the
VLR connected to that MSC will request data
about the mobile station from the HLR.
• Later, if the mobile station makes a call, the VLR
will have the information needed for call setup
without having to interrogate the HLR each time.
34. Authentication Center (AUC)
• The Authentication Center is a protected
database that stores a copy of the secret key
stored in each subscriber's SIM card, which is
used for authentication and ciphering of the
radio channel.
• The AUC protects network operators from
different types of fraud found in today's
cellular world.
35. Equipment Identity Register (EIR)
• The Equipment Identity Register (EIR) is a
database that contains a list of all valid mobile
equipment on the network, where its
International Mobile Equipment Identity
(IMEI) identifies each MS.
• An IMEI is marked as invalid if it has been
reported stolen or is not type approved.
36. GSM - The Operation Support
Subsystem (OSS)
• The operations and maintenance center (OMC) is
connected to all equipment in the switching system
and to the BSC. The implementation of OMC is called
the operation and support system (OSS).
• Here are some of the OMC functions−
• Administration and commercial operation
(subscription, end terminals, charging, and statistics).
• Security Management.
• Network configuration, Operation, and Performance
Management.
• Maintenance Tasks.
37. • The OSS is the functional entity from which
the network operator monitors and controls
the system.
• The purpose of OSS is to offer the customer
cost-effective support for centralized, regional,
and local operational and maintenance
activities that are required for a GSM network.
• An important function of OSS is to provide a
network overview and support the
maintenance activities of different operation
and maintenance organizations.
38. Protocols of GSM
• GSM Architecture is a layered model that is
designed to allow communication between
two different systems.
• Lower layers and upper layers
• Each layer suitable notifications to ensure the
transmitted data has been formatted,
transmitted and received accurately
39.
40. GSM PROTOCOL LAYERS FOR
SIGNALING
• MS and BTS between Um interface
• BTS and BSC between Abis interface
• BSC and MSC between A interface
41. GSM protocol layers
Mobility management (MM)
• The MM layer is in-charge of maintain the
location data, in addition to the
authentication and ciphering procedures
Communication Management (CM)
• The CM layer consists of setting up call at the
user request
• Its functions are call control, which manages
the supplementary services configuration,
short message services which provides point-
to-point short message services
42. • Radio Resource (RR)
• The RR management layer is in-charge
of establishing and maintaining a stable
uninterrupted communication path
between the MSC and MS over which
signaling and user data can be covered
• Handovers are part of the RR layer
responsibility
• Most of the functions are controlled by
the BSC, BTS and MS though some are
performed by the MSC
43. Base Transceiver Station Management (BTSM)
• The BTSM is responsible for transferring the RR
information to the BSC
Link Access Protocol for the ISDN D-Channel
(LAPD):
• Provides error free transmission between the BSC
and MSC
LAPDm:
• It is a modified version of the LADP protocol
• The layer two protocols are provided for by LAPDm
over the air-interface
44. Base Station System Application Part (BSSAP):
• The BSSAP is split into two parts the Base station system
management application part(BSSMAP) and the direct transfer
application part (DTAP)
SS7
• Signaling system no.7 is used for signaling between MSC and
BSC
• This protocol also transfer information between MSCs, HLR,
VLR, Auc, EIR and MOC
45. GSM CONNECTION ESTABLISHMENT
LOCALIZATION
• The localization is a process by which a mobile
station is identified, authenticated and
provided service by a mobile switching center
through the base station controller and base
Tran receiver either at the home location of
the MS or at a visiting location.
46. Frequency allocation
• GSM has been allocated an operational
frequency from 890 MHz
• MS and BS use different frequency ranges
• EX: MS (890 MHz to 915 MHz )
BS(935 MHz to 960 MHz )
GSM system uses a varity control channel
to ensure uninterrupted communication
between MS and BS
47. • Broad cast control channel (BCCH)
Used for transmitting system parameters
• Frequency correction channel (FCCH)
• Synchronization channel(SCH)
• Random access channel(RACH)
• Paging channel (PCH)
• Access grant channel (AGCH)
BS to send information timing and
synchronization.
48. GPRS(General Packet Radio Services) -
Architecture
• GPRS architecture works on the same procedure like GSM
network, but, has additional entities that allow packet data
transmission.
• This data network overlaps a second-generation GSM
network providing packet data transport at the rates from
9.6 to 171 kbps.
• Along with the packet data transport the GSM network
accommodates multiple users to share the same air
interface resources concurrently.
• The GPRS architecture introduces two new network
elements
– gateway GPRS support node (GGSN)
– serving GPRS support node (SGSN)
49.
50. • GPRS Mobile Stations
• New Mobile Stations (MS) are required to use
GPRS services because existing GSM phones
do not handle the enhanced air interface or
packet data.
• A variety of MS can exist, including a high-
speed version of current phones to support
high-speed data access, a new PDA device
with an embedded GSM phone, and PC cards
for laptop computers.
• These mobile stations are backward
compatible for making voice calls using GSM.
51. GPRS Base Station Subsystem
• Each BSC requires the installation of one or more Packet Control
Units (PCUs) and a software upgrade. The PCU provides a physical
and logical data interface to the Base Station Subsystem (BSS) for
packet data traffic.
• The BTS can also require a software upgrade but typically does not
require hardware enhancements.
• When either voice or data traffic is originated at the subscriber
mobile, it is transported over the air interface to the BTS, and from
the BTS to the BSC in the same way as a standard GSM call.
• However, at the output of the BSC, the traffic is separated; voice is
sent to the Mobile Switching Center (MSC) per standard GSM, and
data is sent to a new device called the SGSN via the PCU over a
Frame Relay interface.
52. • GPRS Support Nodes
• Following two new components, called
Gateway GPRS Support Nodes (GSNs) and,
Serving GPRS Support Node (SGSN) are added:
53. • Gateway GPRS Support Node (GGSN)
• The Gateway GPRS Support Node acts as an
interface and a router to external networks.
• It contains routing information for GPRS mobiles,
which is used to tunnel packets through the IP
based internal backbone to the correct Serving
GPRS Support Node.
• The GGSN also collects charging information
connected to the use of the external data
networks and can act as a packet filter for
incoming traffic.
54. • Serving GPRS Support Node (SGSN)
• The Serving GPRS Support Node is responsible for
authentication of GPRS mobiles, registration of mobiles
in the network, mobility management, and collecting
information on charging for the use of the air interface.
• Internal Backbone
• The internal backbone is an IP based network used to
carry packets between different GSNs. Tunnelling is
used between SGSNs and GGSNs, so the internal
backbone does not need any information about
domains outside the GPRS network. Signalling from a
GSN to a MSC, HLR or EIR is done using SS7.
55. • Routing Area
• GPRS introduces the concept of a Routing
Area. This concept is similar to Location Area
in GSM, except that it generally contains fewer
cells. Because routing areas are smaller than
location areas, less radio resources are used
While broadcasting a page message.
57. GPRS - Protocol Stack
• The flow of GPRS protocol stack and end-to-
end message from MS to the GGSN is
displayed in the below diagram. GTP is the
protocol used between the SGSN and GGSN
using the Gn interface. This is a Layer 3
tunneling protocol.
58.
59. • The process that takes place in the application
looks like a normal IP sub-network for the users
both inside and outside the network.
• The vital thing that needs attention is, the
application communicates via standard IP, that is
carried through the GPRS network and out
through the gateway GPRS.
• The packets that are mobile between the GGSN
and the SGSN use the GPRS tunneling protocol,
this way the IP addresses located on the external
side of the GPRS network do not have deal with
the internal backbone. UDP and IP are run by
GTP.
60. • SubNetwork Dependent Convergence Protocol
(SNDCP) and Logical Link Control (LLC)
combination used in between the SGSN and the
MS. The SNDCP flattens data to reduce the load
on the radio channel. A safe logical link by
encrypting packets is provided by LLC and the
same LLC link is used as long as a mobile is under
a single SGSN.
• In case, the mobile moves to a new routing area
that lies under a different SGSN; then, the old LLC
link is removed and a new link is established with
the new Serving GSN X.25. Services are provided
by running X.25 on top of TCP/IP in the internal
backbone.
62. GENERATIONS OF MOBILE COMMUNICATION
TECHNOLOGIES
• First Generation
• Second Generation
• Third Generation
• Fourth Generation
• Fifth Generation
63. GENERATIONS OF MOBILE COMMUNICATION
TECHNOLOGIES
• First Generation
• Second Generation
• Third Generation
• Fourth Generation
• Fifth Generation
64. First Generation
• It uses analog technology that were introduced
in the 1980s and continued until being replaced
by 2G digital telecommunications
It introduces the following mobile technologies
• Mobile Telephone System (MTS)
• Advanced Mobile Telephone System (AMTS)
• Improved Mobile Telephone Service (IMTS)
• Push to Talk (PTT)
65. Features
• Maximum speed of 1G is 2.4 Kbps
• Allows voice calls in 1 country
• Use analog signal
• Channel bandwidth 30khz
Disadvantage
• Poor Voice Quality
• Poor Battery Life
• Large Phone Size
• No Security
• Limited Capacity
66. Second Generation
• Second Generation based on GSM.
• It was launched in Finland in the year 1991.
• It uses digital signals for voice transmission.
• It make use of either CDMA or TDMA.
67. Features
• Lower power emissions
• Data speed was upto 64kbps
• Use digital signals
• Enables services such as text messages,
picture messages and MMS(Multimedia
message) Provides better quality and capacity
Limitations
• Requires powerful digital signals to work the
mobile phones
• Unable to handle complex data such as videos
68. Third Generation
• It make use of TDMA and CDMA.
• It provides value added services like mobile
television, GPS (global positioning system),
live streaming and video conferencing.
• It is designed for multimedia communication
69. Features
• Fast data transfer rates
• Speed 2 Mbps
• Send/receive large email messages
• Provide seamless global roaming
Limitations
• Requires higher bandwidth
• Cost is high
70. Fourth Generation
• It is an all IP-based integrated system will be
capable to provide 100 Mbps for high mobility
and 1 Gbps.
• The user services include IP telephony, ultra-
broadband Internet access, gaming services
and High Definition Television (HDTV)
streamed multimedia.
71. Feature
• Capable of provide 10Mbps-1Gbps speed
• High quality streaming video
• Combination of Wi-Fi and Wi-Max
• High security
• Low cost per-bit
Limitations
• Battery uses is more
• Hard to implement
• Need complicated hardware
• Expensive equipment required to implement next
generation network
72. Fifth Generation
• Its not yet have been deployed and are still at
a research and development phase
• Increased data transmission capability 1 Gbps
• Connectivity to a large number of devices due
to the IoT.
• Period of establishment 2016 to 2020.
73. Software Defined Radio Receiver
• The basic concept of the SDR software radio is that the
radio can be totally configured or defined by the software.
• In an ideal world the incoming signal is immediately
converted to a digital format, and the signal is then
processed totally digitally.
• Conversely for transmit, the signal is generated digitally,
and converted to the final analogue signal at the antenna.
• This approach has the advantages that the radio can be
totally reconfigured for a new application, simply by
changing the software. Updates can be made to keep up
with new modulation formats, new applications, etc, simply
by updating the software.
74. • It also means that a common hardware
platform can be used across a variety of
different products and applications, thereby
reducing costs, whilst maintaining or
improving the performance.
75.
76.
77. Software defined radio applications
• The SDR software radio concept is applicable to many areas
of use:
• Mobile communications: Software defined radios are very
useful in areas such as mobile communications. By
upgrading the software it is possible to apply changes to
any standards and even add new waveforms purely by
upgrading the software and without the need for changes
to the hardware. This can even be done remotely, thereby
providing considerable savings in cost.
• Research & development: The software defined radio,
SDR is very useful in many research projects. The radios can
be configured to provide the exact receiver and transmitter
requirements for any application without the need for a
total hardware design from scratch.
78. • Military: The military have made much use of
software defined radio technology enabling them
to re-use hardware and update signal waveforms
as needed.
• Amateur radio: Radio hams have very
successfully employed software defined radio
technology, using it to provide improved
performance and flexibility.
• Other: There are very many other applications
that can make use of SDR technology, enabling
the radio to be exactly tailored to the
requirements using software adjustments.
79. Software defined radio definition
• Many definitions have appeared that might cover a
definition for a software defined radio, SDR. The SDR Forum
themselves have defined the two main types of radio
containing software in the following fashion:
• Software Controlled Radio: Radio in which some or all of
the physical layer functions are Software Controlled. In
other words this type of radio only uses software to provide
control of the various functions that are fixed within the
radio.
• Software Defined Radio: Radio in which some or all of the
physical layer functions are Software Defined. In other
words, the software is used to determine the specification
of the radio and what it does. If the software within the
radio is changed, its performance and function may change.
80. • Advantages of SDR technology
• It is possible to achieve very high levels of
performance.
• Performance can be changed by updating the
software (it will not be possible to update
hardware dependent attributes though).
• It is possible to reconfigure radios by updating
software
• The same hardware platform can be used for
several different radios
81. • Disadvantages of SDR technology
• Analogue to digital converters limit top
frequencies that can be used by the digital
section.
• For very simple radios the basic platform may
be too expensive.
• Development of a software defined radio
requires both hardware and software skills.