The document discusses the Global System for Mobiles (GSM) mobile communication technology. It describes GSM concepts like cellular structure and frequency division duplexing. It outlines the GSM network architecture including components like the mobile station, base station, base station controller, mobile switching center, home location register, and visitor location register. It also covers GSM channels, mobility management, and call management functions.
The document describes the call flow procedures for mobile originating and mobile terminating calls in a GSM network.
For a mobile originating call, the MS requests a dedicated channel and indicates it wants to set up a call. The MSC receives the call setup message and checks for call barring before establishing a link with the BSC. The BSC assigns a traffic channel for the call.
For a mobile terminating call, the call is routed to the GMSC serving the called subscriber's home network. The GMSC queries the HLR for routing information. The HLR provides a roaming number to route the call to the subscriber's current MSC. The MSC pages the subscriber through the BSCs in their
• -How the channel concept is used on the radio interface
• -Different burst formats in the radio interface
• -The hierarchical frame structure
• -The content sent in different logical channels
• -The mapping of the logical channels
• -Superframe and Hyperframe
• -MOBILE STATIONS ISDN NUMBER (MSISDN)
• INTERNATIONAL MOBILE SUBSCRIBER IDENTITY (IMSI)
• TEMPORARY MOBILE SUBSCRIBER IDENTITY (TMSI)
• LOCATION AREA IDENTITY (LAI)
• CELL GLOBAL IDENTITY (CGI)
• BASE STATION IDENTITY CODE (BSIC)
• PIN management
This document summarizes GSM architecture and call flows, including inter-MSC and intra-MSC call flows. Inter-MSC call flow occurs between two different MSCs, while intra-MSC call flow is between two BSCs within the same MSC. The inter-MSC call flow involves signaling between the BSC, MSC-O, MSC-T, HLR, and RNC to set up and release the call bearers. The intra-MSC call flow involves signaling between the MS-O, BSC-O, MSC/VLR, MGW, HLR, BSC-T, and MS-T to authenticate, set up, and release call bearers within a single MSC
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 GPRS network architecture and processes. It describes how a mobile station (MS) attaches to and detaches from the GPRS network by communicating with the SGSN and HLR. It also describes how a temporary block flow (TBF) is established to enable data transfer between the MS and network. Additionally, it outlines how a packet data protocol (PDP) context is activated and deactivated to manage the subscriber's data session.
The document provides an overview of GSM protocols:
- It describes the 7 layers of the OSI model and how they relate to network support layers (physical and data link layers) and user support layers (session, presentation, and application layers).
- It explains key GSM protocol layers including the physical layer, data link layer, and signaling layers used for call setup and termination between mobile devices and the core network.
- It also discusses common protocols used in telephone networks like ISDN, SS7, and how protocols like SCCP, TCAP, MAP, and INAP are used to support services like roaming and calling card transactions.
The document describes the key components of a GSM network and their functions:
- The BTS handles radio transmissions and defines each cell. The BSC manages radio resources and handles handovers between BTSs. The MSC performs switching between mobile and other networks.
- The HLR is a central database that stores subscriber information. The VLR temporarily stores subscriber data needed by the local MSC. The EIR stores valid device IDs. The AUC authenticates users and protects the network from fraud.
Together, these components enable functions like call setup, location updates, authentication, and mobility as users move between cells in a GSM network.
The document provides an overview of GSM RF interview questions and answers. It covers topics such as the three services offered by GSM (teleservices, bearer services, and supplementary services), spectrum allocation for GSM-900 and DCS-1800, carrier frequencies and separation, ciphering and authentication algorithms, equalization, interleaving, speech coding, channel coding, frequency reuse, cell splitting, interfaces (Um, Abis, A), LAPD and LAPDm, WPS, MA, MAIO, frequency hopping types, DTX, DRX, gross data rate, Erlangs and grade of service, coverage differences between GSM900 and DCS1800, time advance, location area and location update
The document describes the call flow procedures for mobile originating and mobile terminating calls in a GSM network.
For a mobile originating call, the MS requests a dedicated channel and indicates it wants to set up a call. The MSC receives the call setup message and checks for call barring before establishing a link with the BSC. The BSC assigns a traffic channel for the call.
For a mobile terminating call, the call is routed to the GMSC serving the called subscriber's home network. The GMSC queries the HLR for routing information. The HLR provides a roaming number to route the call to the subscriber's current MSC. The MSC pages the subscriber through the BSCs in their
• -How the channel concept is used on the radio interface
• -Different burst formats in the radio interface
• -The hierarchical frame structure
• -The content sent in different logical channels
• -The mapping of the logical channels
• -Superframe and Hyperframe
• -MOBILE STATIONS ISDN NUMBER (MSISDN)
• INTERNATIONAL MOBILE SUBSCRIBER IDENTITY (IMSI)
• TEMPORARY MOBILE SUBSCRIBER IDENTITY (TMSI)
• LOCATION AREA IDENTITY (LAI)
• CELL GLOBAL IDENTITY (CGI)
• BASE STATION IDENTITY CODE (BSIC)
• PIN management
This document summarizes GSM architecture and call flows, including inter-MSC and intra-MSC call flows. Inter-MSC call flow occurs between two different MSCs, while intra-MSC call flow is between two BSCs within the same MSC. The inter-MSC call flow involves signaling between the BSC, MSC-O, MSC-T, HLR, and RNC to set up and release the call bearers. The intra-MSC call flow involves signaling between the MS-O, BSC-O, MSC/VLR, MGW, HLR, BSC-T, and MS-T to authenticate, set up, and release call bearers within a single MSC
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 GPRS network architecture and processes. It describes how a mobile station (MS) attaches to and detaches from the GPRS network by communicating with the SGSN and HLR. It also describes how a temporary block flow (TBF) is established to enable data transfer between the MS and network. Additionally, it outlines how a packet data protocol (PDP) context is activated and deactivated to manage the subscriber's data session.
The document provides an overview of GSM protocols:
- It describes the 7 layers of the OSI model and how they relate to network support layers (physical and data link layers) and user support layers (session, presentation, and application layers).
- It explains key GSM protocol layers including the physical layer, data link layer, and signaling layers used for call setup and termination between mobile devices and the core network.
- It also discusses common protocols used in telephone networks like ISDN, SS7, and how protocols like SCCP, TCAP, MAP, and INAP are used to support services like roaming and calling card transactions.
The document describes the key components of a GSM network and their functions:
- The BTS handles radio transmissions and defines each cell. The BSC manages radio resources and handles handovers between BTSs. The MSC performs switching between mobile and other networks.
- The HLR is a central database that stores subscriber information. The VLR temporarily stores subscriber data needed by the local MSC. The EIR stores valid device IDs. The AUC authenticates users and protects the network from fraud.
Together, these components enable functions like call setup, location updates, authentication, and mobility as users move between cells in a GSM network.
The document provides an overview of GSM RF interview questions and answers. It covers topics such as the three services offered by GSM (teleservices, bearer services, and supplementary services), spectrum allocation for GSM-900 and DCS-1800, carrier frequencies and separation, ciphering and authentication algorithms, equalization, interleaving, speech coding, channel coding, frequency reuse, cell splitting, interfaces (Um, Abis, A), LAPD and LAPDm, WPS, MA, MAIO, frequency hopping types, DTX, DRX, gross data rate, Erlangs and grade of service, coverage differences between GSM900 and DCS1800, time advance, location area and location update
The document provides information on basic GSM principles and comparisons between TACS, GSM 900, and DCS 1800 mobile networks. It discusses topics like uplink and downlink frequencies, carrier separation, number of channels, access methods, logical channels, control channels, cell identities, and other key GSM concepts and terms. The document also includes detailed descriptions and explanations of terms like IMSI, TMSI, LAI, CGI, BSIC, SIM, and concepts like cell selection, location updating, and pin management.
Mobile networks have evolved over several generations from 1G analog cellular to 4G LTE networks. This document provides an overview of the fundamental concepts and evolution of mobile networks including discussions of 2G, 3G, 4G networks and the Evolved Packet Core. It describes the core network functions and interfaces as well as basic network scenarios.
CDMA Technology & IS-95
- CDMA uses spread spectrum techniques where signals are spread over a wide frequency band before transmission. IS-95 is a 2G mobile telecommunications standard that uses CDMA.
- IS-95 defines forward and reverse air interfaces with different channel structures using techniques like orthogonal codes, power control, and RAKE receivers.
- The document discusses the technical details of the IS-95 forward and reverse channel structures including the pilot, sync, paging and traffic channels.
Gsm architecture, gsm network identities, network cases, cell planning, and c...Zorays Solar Pakistan
This document discusses GSM network architecture and components. It describes the key elements like the MSC, HLR, VLR and their functions. It explains cell planning and frequency reuse. It also covers network identities, attaching and roaming processes, call setup, and charging systems like triggered charging for calls and SMS. Compound charging processes for originating calls, voucher refills through IVR are summarized.
GSM uses frequency division duplexing with carriers separated by 200 kHz. Each carrier is divided into 8 time slots using TDMA. Logical channels like traffic channels and signaling channels are mapped onto these physical time slots. Traffic channels carry user data at either full rate or half rate, while signaling channels include broadcast, common, and dedicated control channels used for functions like synchronization, paging, call setup, and handover.
What is GSM?
The Global System for Mobile communications is a digital cellular communications system. It was developed in order to create a common European mobile telephone standard but it has been rapidly accepted worldwide.
Formerly it was “Groupe Spéciale Mobile” (founded in 1982)
now: Global System for Mobile Communication.
Services:
Tele-services
Bearer or Data Services
Supplementary services
Applications:
Mobile telephony
GSM-R
Telemetry System
- Fleet management
- Automatic meter reading
- Toll Collection
- Remote control and fault reporting of DG sets
Value Added Services
Advantages:
Better Quality of speech
Data transmission is supported
New services offered due to ISDN compatibility
International Roaming possible
Large market
Crisper, cleaner quieter calls
disadvantages:
Dropped and missed calls
Less Efficiency
Security Issues
conclusion
The mobile telephony industry rapidly growing and that has become backbone for business success and efficiency and a part of modern lifestyles all over the world.
In this session I have tried to give and over view of the GSM system. I hope that I gave the general flavor of GSM and the philosophy behind its design.
The GSM is standard that insures interoperability without stifling competition and innovation among the suppliers to the benefit of the public both in terms of cost and service quality.
The document discusses SDCCH (Standalone Dedicated Control Channel) configuration and usage in GSM networks. It describes possible SDCCH configurations including SDCCH/8 and SDCCH/4. It also discusses SDCCH holding times for different functions, reasons for SDCCH congestion, and methods to prevent congestion through proper dimensioning of SDCCH resources.
This document provides guidance on optimizing call setup time (CST) in GSM networks. It defines CST, lists influencing factors like procedure configuration, parameter settings, routing, and hardware issues. It describes the analysis process and provides optimization methods for each factor. Specific optimization cases are also presented, like long CST due to inconsistent signaling procedures between vendors. The document aims to help operators analyze CST issues and identify optimization solutions.
The document provides an overview of GSM, GPRS, UMTS, HSDPA and HSUPA protocols and call flows. It describes the architecture, interfaces and protocols of each generation at the physical, data link and network layers. Key protocols discussed include LAPD, RR, MM, CM, SNDCP, GTP, RLC, MAC, RRC. Call flows for basic call origination, authentication, data transfer and detach procedures are illustrated for each network. The document also introduces HSDPA and HSUPA enhancements to UMTS such as new channels, scheduling functionality and H-ARQ protocol.
The GSM system architecture is divided into three major systems: the Switching System (SS), the Base Station System (BSS), and the Operation and Support System (OSS). The SS handles call processing and subscriber functions and includes the MSC, HLR, VLR, and other registers. The BSS handles radio functions and includes the BSC and BTS. The OSS manages errors, configuration, faults, and performance across the network. Key interfaces include the A interface between MSC and BSS, the B interface between MSC and VLR, and the Um interface between MS and BTS.
This document provides an introduction to GSM networks and their history. It discusses [1] the origins and evolution of cellular networks prior to GSM, [2] the formation of GSM in 1982 to develop a pan-European cellular standard, and [3] the key phases and advances of GSM technology over time, including digital voice services, SMS, and mobile data. The document also outlines some of the main advantages of GSM networks, including international roaming, security, voice quality, and their use of a single global standard.
This document discusses paging and location update procedures in cellular networks. It defines key terms like MSC, VLR, HLR, TMSI, LA, LAI, and describes how location areas are configured and how location updates and paging work. When a mobile moves to a new location area or PLMN, it performs a location update by sending a message to the new MSC/VLR, which updates the subscriber's HLR. Periodic and random location updates also allow the network to track mobile locations. Paging is used to find mobiles and deliver incoming calls based on location registration information.
Call flow oma000003 gsm communication flowEricsson Saudi
The document summarizes several key GSM procedures including authentication and ciphering sequence, location update sequence, basic call sequences, and equipment identification. It provides detailed signaling diagrams to illustrate the message flows between different nodes in the network for these procedures.
Nokia gsm-kpi-analysis-based-on-daily-monitoring-basis-presentationmohammed khairy
This document discusses key performance indicators (KPIs) for monitoring a GSM network and reasons for and solutions to common issues. It provides relationships between different network elements and describes concepts like SD blocking, SD drop, TCH blocking, TCH assignment, TCH drop, and handover success rate (HOSR). For each KPI, it outlines potential causes for degradation and recommendations to address hardware faults, interference, parameter misconfiguration, and other problems.
High-level architecture of Mobile Cellular Networks from 2G to 5G3G4G
The document outlines the evolution of mobile network architectures from 2G to 5G. It describes the key components of 2G, 2.5G, 3G, 4G, and 5G networks. The 2G network included a BSC, BTS, MSC and MS. 2.5G added GPRS capability with an SGSN and GGSN. 3G introduced UMTS with an RNC. 4G networks used LTE with an EPC including MME, S-GW and P-GW. 5G phase 1 used an eNodeB and 5G NR radio. 5G phase 2 added an NGCN core network, while phase 3 removed the EPC.
Signaling System #7 (SS7) is a telecommunications protocol that defines high-speed circuit switching for telephone calls and uses out-of-band signaling between service switching points, signal transfer points, and service control points. It has advantages like separation of control information onto logically separate paths, message-oriented call information exchange, and ability of a single signaling channel to carry information about multiple trunks. The SS7 architecture includes service switching points, service control points, and signal transfer points that communicate using protocols like ISUP, TCAP, and SCCP.
This documents will help to understand the details procedure of GSM IDLE Mode Behavior. GSM Idle mode behavior starting from PLMN selection, GSM Cell Camp, Cell Selection, Cell Reselection, Location Update, Paging, System Information to Measurements procedures have been captured in this document.
The document discusses 4G LTE drive testing. It describes the necessary equipment for drive testing including a notebook, GPS, and LTE dongle. It outlines key LTE radio parameters that are measured like PCI, RSRP, SINR, and MIMO. It also discusses measuring UE state information, throughput, and LTE access procedures including attach requests, random access failures, and E-RAB failures. Finally, it compares the impact of ANR capabilities versus UE capabilities on measuring neighboring cells within and between eNodeBs.
The document describes the key components and architecture of the GSM system. It discusses the objectives of GSM including supporting international roaming and good speech quality. It then describes the hierarchy of the GSM system including the mobile station, radio subsystem with base stations and base station controllers, and the network and switching subsystem with mobile switching centers and databases. It also discusses the air interface including frequency allocation and channel structure.
In CDMA , All user share the same radio channel.If one user take more power than it need, then other will be suffer and capacity will be decreased.
This presentation adresses how to tune The CDMA cellular radio network in order to tolarate interference.
The document summarizes the key components of a CDMA antenna and feeder system. The system comprises antennas, antenna jumpers, main feeders, lightning arresters, cabinet-top jumpers, and grounding parts. Antennas have electrical properties like frequency range, impedance, VSWR, polarization, and gain. They also have mechanical properties like dimensions, weight, operating temperature range, and lightning protection. Common antenna types include directional and omnidirectional antennas. The main feeder connects the antenna to other components and has specifications for material, maximum frequency, impedance, and bending radius. A GPS antenna feeder system is also included to capture clock signals for CDMA use.
The document provides information on basic GSM principles and comparisons between TACS, GSM 900, and DCS 1800 mobile networks. It discusses topics like uplink and downlink frequencies, carrier separation, number of channels, access methods, logical channels, control channels, cell identities, and other key GSM concepts and terms. The document also includes detailed descriptions and explanations of terms like IMSI, TMSI, LAI, CGI, BSIC, SIM, and concepts like cell selection, location updating, and pin management.
Mobile networks have evolved over several generations from 1G analog cellular to 4G LTE networks. This document provides an overview of the fundamental concepts and evolution of mobile networks including discussions of 2G, 3G, 4G networks and the Evolved Packet Core. It describes the core network functions and interfaces as well as basic network scenarios.
CDMA Technology & IS-95
- CDMA uses spread spectrum techniques where signals are spread over a wide frequency band before transmission. IS-95 is a 2G mobile telecommunications standard that uses CDMA.
- IS-95 defines forward and reverse air interfaces with different channel structures using techniques like orthogonal codes, power control, and RAKE receivers.
- The document discusses the technical details of the IS-95 forward and reverse channel structures including the pilot, sync, paging and traffic channels.
Gsm architecture, gsm network identities, network cases, cell planning, and c...Zorays Solar Pakistan
This document discusses GSM network architecture and components. It describes the key elements like the MSC, HLR, VLR and their functions. It explains cell planning and frequency reuse. It also covers network identities, attaching and roaming processes, call setup, and charging systems like triggered charging for calls and SMS. Compound charging processes for originating calls, voucher refills through IVR are summarized.
GSM uses frequency division duplexing with carriers separated by 200 kHz. Each carrier is divided into 8 time slots using TDMA. Logical channels like traffic channels and signaling channels are mapped onto these physical time slots. Traffic channels carry user data at either full rate or half rate, while signaling channels include broadcast, common, and dedicated control channels used for functions like synchronization, paging, call setup, and handover.
What is GSM?
The Global System for Mobile communications is a digital cellular communications system. It was developed in order to create a common European mobile telephone standard but it has been rapidly accepted worldwide.
Formerly it was “Groupe Spéciale Mobile” (founded in 1982)
now: Global System for Mobile Communication.
Services:
Tele-services
Bearer or Data Services
Supplementary services
Applications:
Mobile telephony
GSM-R
Telemetry System
- Fleet management
- Automatic meter reading
- Toll Collection
- Remote control and fault reporting of DG sets
Value Added Services
Advantages:
Better Quality of speech
Data transmission is supported
New services offered due to ISDN compatibility
International Roaming possible
Large market
Crisper, cleaner quieter calls
disadvantages:
Dropped and missed calls
Less Efficiency
Security Issues
conclusion
The mobile telephony industry rapidly growing and that has become backbone for business success and efficiency and a part of modern lifestyles all over the world.
In this session I have tried to give and over view of the GSM system. I hope that I gave the general flavor of GSM and the philosophy behind its design.
The GSM is standard that insures interoperability without stifling competition and innovation among the suppliers to the benefit of the public both in terms of cost and service quality.
The document discusses SDCCH (Standalone Dedicated Control Channel) configuration and usage in GSM networks. It describes possible SDCCH configurations including SDCCH/8 and SDCCH/4. It also discusses SDCCH holding times for different functions, reasons for SDCCH congestion, and methods to prevent congestion through proper dimensioning of SDCCH resources.
This document provides guidance on optimizing call setup time (CST) in GSM networks. It defines CST, lists influencing factors like procedure configuration, parameter settings, routing, and hardware issues. It describes the analysis process and provides optimization methods for each factor. Specific optimization cases are also presented, like long CST due to inconsistent signaling procedures between vendors. The document aims to help operators analyze CST issues and identify optimization solutions.
The document provides an overview of GSM, GPRS, UMTS, HSDPA and HSUPA protocols and call flows. It describes the architecture, interfaces and protocols of each generation at the physical, data link and network layers. Key protocols discussed include LAPD, RR, MM, CM, SNDCP, GTP, RLC, MAC, RRC. Call flows for basic call origination, authentication, data transfer and detach procedures are illustrated for each network. The document also introduces HSDPA and HSUPA enhancements to UMTS such as new channels, scheduling functionality and H-ARQ protocol.
The GSM system architecture is divided into three major systems: the Switching System (SS), the Base Station System (BSS), and the Operation and Support System (OSS). The SS handles call processing and subscriber functions and includes the MSC, HLR, VLR, and other registers. The BSS handles radio functions and includes the BSC and BTS. The OSS manages errors, configuration, faults, and performance across the network. Key interfaces include the A interface between MSC and BSS, the B interface between MSC and VLR, and the Um interface between MS and BTS.
This document provides an introduction to GSM networks and their history. It discusses [1] the origins and evolution of cellular networks prior to GSM, [2] the formation of GSM in 1982 to develop a pan-European cellular standard, and [3] the key phases and advances of GSM technology over time, including digital voice services, SMS, and mobile data. The document also outlines some of the main advantages of GSM networks, including international roaming, security, voice quality, and their use of a single global standard.
This document discusses paging and location update procedures in cellular networks. It defines key terms like MSC, VLR, HLR, TMSI, LA, LAI, and describes how location areas are configured and how location updates and paging work. When a mobile moves to a new location area or PLMN, it performs a location update by sending a message to the new MSC/VLR, which updates the subscriber's HLR. Periodic and random location updates also allow the network to track mobile locations. Paging is used to find mobiles and deliver incoming calls based on location registration information.
Call flow oma000003 gsm communication flowEricsson Saudi
The document summarizes several key GSM procedures including authentication and ciphering sequence, location update sequence, basic call sequences, and equipment identification. It provides detailed signaling diagrams to illustrate the message flows between different nodes in the network for these procedures.
Nokia gsm-kpi-analysis-based-on-daily-monitoring-basis-presentationmohammed khairy
This document discusses key performance indicators (KPIs) for monitoring a GSM network and reasons for and solutions to common issues. It provides relationships between different network elements and describes concepts like SD blocking, SD drop, TCH blocking, TCH assignment, TCH drop, and handover success rate (HOSR). For each KPI, it outlines potential causes for degradation and recommendations to address hardware faults, interference, parameter misconfiguration, and other problems.
High-level architecture of Mobile Cellular Networks from 2G to 5G3G4G
The document outlines the evolution of mobile network architectures from 2G to 5G. It describes the key components of 2G, 2.5G, 3G, 4G, and 5G networks. The 2G network included a BSC, BTS, MSC and MS. 2.5G added GPRS capability with an SGSN and GGSN. 3G introduced UMTS with an RNC. 4G networks used LTE with an EPC including MME, S-GW and P-GW. 5G phase 1 used an eNodeB and 5G NR radio. 5G phase 2 added an NGCN core network, while phase 3 removed the EPC.
Signaling System #7 (SS7) is a telecommunications protocol that defines high-speed circuit switching for telephone calls and uses out-of-band signaling between service switching points, signal transfer points, and service control points. It has advantages like separation of control information onto logically separate paths, message-oriented call information exchange, and ability of a single signaling channel to carry information about multiple trunks. The SS7 architecture includes service switching points, service control points, and signal transfer points that communicate using protocols like ISUP, TCAP, and SCCP.
This documents will help to understand the details procedure of GSM IDLE Mode Behavior. GSM Idle mode behavior starting from PLMN selection, GSM Cell Camp, Cell Selection, Cell Reselection, Location Update, Paging, System Information to Measurements procedures have been captured in this document.
The document discusses 4G LTE drive testing. It describes the necessary equipment for drive testing including a notebook, GPS, and LTE dongle. It outlines key LTE radio parameters that are measured like PCI, RSRP, SINR, and MIMO. It also discusses measuring UE state information, throughput, and LTE access procedures including attach requests, random access failures, and E-RAB failures. Finally, it compares the impact of ANR capabilities versus UE capabilities on measuring neighboring cells within and between eNodeBs.
The document describes the key components and architecture of the GSM system. It discusses the objectives of GSM including supporting international roaming and good speech quality. It then describes the hierarchy of the GSM system including the mobile station, radio subsystem with base stations and base station controllers, and the network and switching subsystem with mobile switching centers and databases. It also discusses the air interface including frequency allocation and channel structure.
In CDMA , All user share the same radio channel.If one user take more power than it need, then other will be suffer and capacity will be decreased.
This presentation adresses how to tune The CDMA cellular radio network in order to tolarate interference.
The document summarizes the key components of a CDMA antenna and feeder system. The system comprises antennas, antenna jumpers, main feeders, lightning arresters, cabinet-top jumpers, and grounding parts. Antennas have electrical properties like frequency range, impedance, VSWR, polarization, and gain. They also have mechanical properties like dimensions, weight, operating temperature range, and lightning protection. Common antenna types include directional and omnidirectional antennas. The main feeder connects the antenna to other components and has specifications for material, maximum frequency, impedance, and bending radius. A GPS antenna feeder system is also included to capture clock signals for CDMA use.
This document discusses energy meters and advance metering infrastructure (AMI). It provides a history of energy meters from electromechanical to static meters. It describes the components of AMI including smart meters, head end systems, data concentrator units, meter data collection, meter data management systems, and communication networks. AMI allows for automated and remote reading of energy consumption data as well as two-way communication between utilities and customers.
GSM BASED PREPAID ENERGY METER BILLING VIA SMSSRINIVAS REDDY
The project is designed for reading electrical energy consumed in units and in rupees to display on an LCD screen to the user. This data is also provided to the electrical department using GSM technology for billing purposes. Owing to high electricity cost these days it becomes necessary for the consumer to know as to how much electricity is consumed to control electricity bill within his budget by recharging the energy meter units via S.M.S .
Finally when the energy meter coming to zero user can again recharge according to the purpose used. In this proposed system, the consumer will get his energy consumption data on real time basis on a LCD display. The same data is sent through GSM modem to the electricity department via SMS. A microcontroller of 8051 family is interfaced to the energy meter to get the Watt Hour pulses.
Further this project can be enhanced by to control the electrical appliances remotely via SMS. Also, the electricity department can send the monthly bill amount over SMS to the receiving unit for consumer information.
This document describes a smart energy meter that uses a GSM module to send electricity consumption data via SMS. The meter uses an AD7751 IC to measure real power consumption based on current and voltage inputs. An AVR microcontroller then processes this data and calculates energy used. It can send meter readings, billing information, and load details to the user's mobile phone upon request via a missed call to provide real-time monitoring. The smart meter allows for accurate and automated energy monitoring and billing compared to traditional meters.
GPRS is a packet-based mobile data service that allows intermittent and bursty data transmissions over existing GSM networks. It uses packet switching to allocate resources only when needed, reducing connection times. GPRS supports flexible channel allocation and sharing of available resources between users. Common applications include standard IP-based services as well as GPRS-specific point-to-point and point-to-multipoint applications. Operators can generate revenue through new subscribers, services, applications, and increased data traffic under GPRS.
The document discusses the implementation of the Restructured Accelerated Power Development and Reforms Program (R-APDRP) in Rajasthan, India. Key points:
- R-APDRP aims to establish reliable baseline data and adopt IT in energy accounting to reduce losses before distribution strengthening projects.
- It has two parts - Part A focuses on IT applications for energy auditing and consumer services. Part B covers network renovation.
- The Discoms of Rajasthan have taken steps like forming implementation committees and appointing an IT consultant to timely execute the scheme and avail grants.
- Benefits of R-APDRP include increased consumer satisfaction, transparency, reduced out
Basic Telecom concepts
Various Wireless Technologies
Cellular concepts & Principal of cellular Comm.
GSM Network Architecture
GSM channel Architecture
Call Flows in GSM
GSM Planning steps (Nominal Plan & RF surveys)
Alternative means of wireless communication
Walkie - Talkie
Pagers
Trunked private radios
Mobile Phone - the magic technology that enables everyone to communicate anywhere with anybody.
Till 1982 Cellular Systems were exclusively Analog Radio Technology.
Advanced Mobile Phone Service (AMPS)
U.S. standard on the 800 MHz Band
Total Access Communication System (TACS)
U.K. standard on 900 MHz band
Nordic Mobile Telephone System (NMT)
Scandinavian standard on the 450 & 900 MHz band
- GPRS is an upgrade to GSM that allows packet-based data services and efficient use of network bandwidth. It provides higher data rates than GSM and constant connectivity.
- The GPRS network architecture introduces new network elements like the SGSN and GGSN to route data packets. The SGSN manages packet data in its service area while the GGSN connects the GPRS network to external packet networks.
- Session management in GPRS includes establishing PDP contexts for data transfer sessions and location management tracks the routing area of mobile devices through routing area updates.
The document discusses several advantages of CDMA technology, including frequency reuse, large coverage area, high spectrum capacity, privacy, soft handoff, good voice quality, and smooth migration to 3G. It also provides details on ZTE's involvement with CDMA technology development and key components of a CDMA network such as the BSC, BTS, MSC, VLR, and HLR.
CDMA systems use code division multiple access (CDMA) to allow multiple users to access the network simultaneously using the same frequency band. CDMA uses spreading codes to distinguish between users, allowing signals to overlap in both time and frequency. Key aspects of CDMA include soft handoff which provides better call quality during handoffs, rake receivers which mitigate multipath interference, and intelligent vocoders which provide high quality voice compression. CDMA networks also use power control and simple network planning to provide better coverage than comparable systems while using less infrastructure. The cdma2000 1x standard provided increased data speeds and backward compatibility with earlier CDMA networks.
1: Direct sequence and frequency hopped spread spectrum, spreading sequence and their correlation functions, Acquisition and tracking of spread spectrum signals.
2: Error probability for DS-CDMA, on AWGN channels, DS-CDMA on frequency selective fading, channels, Performance analysis of cellular CDMA.
3: Capacity estimation, Power control, effect of imperfect power control on DS CDMA performance, Soft Handoffs.
4: Spreading /coding tradeoffs, multi-carrier CDMA, IS-95 CDMA system, third generation CDMA systems, multi-user detection.
Global System for Mobile (GSM) is a second generation cellular standard developed for voice services and data delivery using digital modulation. It has a network subsystem including components like the MSC, HLR, VLR, and AuC that handle call processing and subscriber information. The radio subsystem consists of BSCs controlling multiple BTSs to manage radio network access. GSM provides international roaming, high quality voice calls, and supports data services like SMS and fax in addition to voice.
CDMA is a digital cellular standard that allows multiple users to access the same radio frequency channel simultaneously through the use of unique code sequences. Users are separated by spreading their transmitted signals across the frequency band using pseudo-random codes. CDMA provides advantages over other multiple access techniques like FDMA and TDMA such as increased capacity, soft handoffs between cells, and covert operation due to its noise-like signals. The IS-95 standard introduced CDMA to cellular networks and specified the use of orthogonal codes to separate signals and a 1.25 MHz channel bandwidth to support multiple simultaneous voice calls.
This document provides an overview of GPRS (General Packet Radio Service) components and architecture. It discusses the key components of GPRS including the SGSN (Serving GPRS Support Node) and GGSN (Gateway GPRS Support Node). It also describes the GPRS interfaces and subsystems, including the radio subsystem, network subsystem, and gateway subsystem. The document outlines how GPRS uses the GSM architecture and packet switching to provide faster data transmission compared to GSM and CDMA networks.
The document provides an overview of GSM architecture including:
1. GSM uses a cellular network architecture with base stations, base station controllers, mobile switching centers, and databases to manage subscriber identity and location.
2. The network allows for voice calls and data services including SMS, and provides security through subscriber authentication and encryption.
3. GSM is a global standard that enabled international roaming and continues to evolve to support higher data rates through technologies like GPRS, EDGE, and WCDMA.
The document provides an overview of the Global System for Mobile communications (GSM) including its history, architecture, key components, and technical aspects. It describes GSM concepts such as cellular structure and multiple access techniques. It also outlines the roles of core network elements like the HLR, VLR, MSC, BSC, BTS, and identifies interfaces between them. Finally, it covers topics like channel structure, encryption, and mobility management in GSM.
This document provides an overview of Global System for Mobile Communications (GSM) technology. It discusses the history and development of GSM standards, the cellular network structure involving base stations, base station controllers, mobile switching centers and other components. It also describes key concepts such as frequency division multiple access, time division multiple access, mobility management, call management, and identifies used in GSM networks including IMSI, TMSI, IMEI. The document outlines the protocol architecture and functions of various nodes in the GSM network.
The document provides an overview of GSM and GPRS networks. It describes key components of the GSM access network including the BTS, BSC and MSC. It also explains the GSM core network elements such as the HLR, VLR, AuC and SMS centers. For GPRS, it outlines the new GPRS support nodes - SGSN and GGSN, and how they interface with existing GSM network elements.
This presentation provides an overview of the Global System for Mobile (GSM) network. It discusses the history and development of GSM, the key components of GSM architecture including the mobile station, base station subsystem, and network switching subsystem. It also describes the technical specifications of GSM such as frequency spectrum, modulation, encryption, and authentication methods. Finally, it outlines the services provided by GSM like teleservices, bearer services, and supplementary services as well as current and future applications of GSM technology.
Global System for Mobile (GSM) is a 2G digital cellular network standard. It uses Time Division Multiple Access (TDMA) and Frequency Division Duplexing (FDD) on radio carriers divided into 200 kHz channels. Each carrier can carry 8 voice channels using time division. GSM introduced digital voice coding, encryption, authentication and roaming between networks. Its architecture includes the Mobile Station (MS), Base Transceiver Station (BTS), Base Station Controller (BSC) and Mobile Switching Center (MSC) connected via standardized interfaces. GSM also uses frequency hopping and has various logical channels for control and traffic.
The document provides an agenda on GSM and GPRS theory that includes:
- An overview of GSM definition, history, services, system architecture, functional model, and interfaces
- Descriptions of the radio interface, A-bis, A-interface, signaling protocols, and inter-MSC signaling
- A brief history of GPRS and definitions of its new network elements and air and A-bis interfaces
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 CDMA (Code Division Multiple Access) technology and standards, including:
1) It describes CDMA as an access method that allows multiple users to occupy the same frequency band using different codes.
2) It summarizes key CDMA standards including IS-95, CDMA2000, and W-CDMA (UMTS), and how they evolved from earlier 2G standards like cdmaOne.
3) It explains some of the technical aspects that enable CDMA including spreading codes, modulation techniques, and how the forward and reverse links are structured.
The document discusses several advantages of CDMA technology, including frequency reuse, large coverage area, high spectrum capacity, privacy, soft handoff, good voice quality, and smooth migration to 3G. It also provides details on ZTE's involvement with CDMA technology development and key components of a CDMA network such as the BTS, BSC, MSC, VLR, and HLR.
The document discusses several advantages of CDMA technology, including frequency reuse, large coverage area, high spectrum capacity, privacy, soft handoff, good voice quality, and smooth migration to 3G. It also provides details on ZTE's involvement with CDMA technology development and key components of a CDMA network such as the BTS, BSC, MSC, VLR, and HLR.
UMTS is the 3G cellular standard proposed by ETSI to evolve GSM and GPRS networks. It uses WCDMA as its air interface and includes the following key aspects:
- A complete system architecture with standardized interfaces to allow interoperability between vendors.
- A UTRAN subsystem comprising Node B base stations and RNC controllers to handle radio functionality using WCDMA.
- A core network subsystem including elements like MSC, SGSN, GGSN to support both circuit switched and packet switched services.
- WCDMA uses CDMA with variable spreading factors to provide different data rates. It employs channelization codes, scrambling codes and modulation like QPSK.
The document provides an overview of GSM networks including:
1. GSM was developed in the 1980s to standardize cellular networks in Europe and is now used globally.
2. The key components of a GSM network are the mobile station (phone), base station subsystem including base transceiver stations and base station controllers, and the network switching subsystem centered around mobile switching centers.
3. GSM uses TDMA and FDMA to allow multiple users to access the same radio channel simultaneously. It operates in the 900MHz and 1800MHz bands and supports data rates up to 9.6kbps along with services like SMS.
GSM (Global System for Mobile communication) is a second generation cellular standard developed to provide voice and data services using digital modulation. It was developed in 1982 by the Groupe Special Mobile to replace incompatible analog cellular systems. GSM specifications include TDMA/FDMA access methods, GMSK modulation, and frequency bands of 900MHz and 1800MHz. The GSM system architecture consists of mobile stations, base station subsystem including BTS and BSC, network switching subsystem including MSC, HLR, VLR, and supplementary registers. GSM provides telecommunication services, bearer services like SMS, and supplementary services like call forwarding. Security is provided through authentication, encryption, and SIM cards. GSM has enabled international ro
This document provides an overview of the Global System for Mobile Communications (GSM) cellular standard. It describes the key components of GSM including the mobile station, base station subsystem, network switching subsystem, and services. It outlines the technical specifications of GSM such as frequency bands, modulation, encryption, and data rates. It also discusses security measures, characteristics, applications, and the evolution of GSM to newer standards.
GSM. Global System for Mobile Communication.Student
This document provides an overview of Global System for Mobile Communication (GSM) technology. It discusses the history and evolution of GSM from 1G to future 5G networks. The key components of a GSM network are described, including the mobile equipment, subscriber identity module, base station system consisting of base transceiver stations and base station controllers, mobile switching center, home location register, visitor location register, and authentication center. Applications, advantages like worldwide connectivity, and disadvantages like limited range are highlighted. The presentation concludes with references and an acknowledgment.
The document discusses 3G mobile communication technologies including UMTS. It describes the network architecture evolution from 3GPP Release '99 to Release 5. Key aspects covered include the core network, radio access network, bearer services, protocols, and handover mechanisms like soft handover.
The document discusses the evolution of mobile communication technologies from 1G to 5G. It provides details on the key aspects of each generation including:
- 1G introduced in 1982 used analog signals for voice calls. 2G launched in late 1980s used digital signals for voice and low-speed data.
- 3G launched in 2000 aimed to offer higher data speeds up to 14 Mbps using packet switching. 4G offers speeds up to 100 Mbps for high-speed internet.
- 5G is still under development to support applications requiring high data rates like wireless broadband, multimedia messaging, mobile TV, and digital video broadcasting.
- Mobile technologies have progressed from simplex to full duplex transmission and 2
This document provides an overview of the Global System for Mobile (GSM) network. It discusses the history and development of GSM from 1982 to the present, outlines the key specifications and components of GSM including frequency bands used, cellular generations, and network architecture. The architecture includes the mobile station (MS), base station subsystem (BSS) consisting of base transceiver stations (BTS) and base station controllers (BSC), and the network switching subsystem (NSS) containing the mobile switching center (MSC), home location register (HLR), visitor location register (VLR), and authentication center (AUC).
The document provides information about top computer science and information technology engineering students from a particular college. It lists their names, academic performance, internship details and projects completed. A total of 30 students have been highlighted for their achievements. The document aims to help recruiters in identifying potential candidates for jobs and internships.
The document describes Advanced Educational Institutions which is affiliated with Maharshi Dayanand University and approved by regulatory bodies, and provides details about its campus location and the various courses offered along with their duration and eligibility criteria at its constituent institutes including Advanced Institute of Technology and Management, Advanced College of Technology and Management, Advanced Institute of Pharmacy, and Advanced Institute of Education.
This document contains a registration form and information about an upcoming seminar on futuristic trends in electronics and communication engineering. The seminar will take place on November 19th, 2011 and will include registration, inaugural and technical sessions, a poster session, best paper award presentation, and closing remarks. Participants are invited to present papers and submit abstracts by October 31st. The organizing committee aims to bring together academics and industry experts to share the latest developments in electronics and communication fields.
This document contains a registration form and information about an upcoming seminar on futuristic trends in electronics and communication engineering. The seminar will take place on November 19th, 2011 and will include registration, inaugural and technical sessions, a poster session, best paper award presentation, and closing remarks. Participants are invited to present papers and submit abstracts by October 31st. The organizing committee aims to bring together academics and industry experts to share the latest developments in electronics and communication fields.
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise causes chemical changes in the brain that may help protect against mental illness and improve symptoms.
The document is an invitation letter from Advanced Institute of Technology & Management (AITM) to the HR manager of a company to visit their campus for conducting interviews. AITM provides undergraduate and postgraduate courses in engineering, IT, and management. It has excellent infrastructure facilities like an auditorium, computer lab, and lecture halls for conducting interviews. Many companies have previously recruited students from AITM for jobs paying between 1.44 to 3.34 lakhs per year. The letter requests the company to schedule a mutually convenient date to visit the campus for recruitment.
The document provides guidance on bridging the gap between academia and industry. It discusses preparing for campus recruitment and interviews, including self-assessment, developing goals and plans, and gaining technical skills and industry exposure. The document also outlines common interview questions and tips for making a strong impression during the interview process.
The document provides guidance on bridging the gap between academia and industry. It discusses preparing for campus recruitment and interviews, including self-assessment, setting goals, technical skills, common interview questions, and tips for conducting oneself during an interview. The main areas interviews generally focus on are education, work experience, career goals, personal qualities, and company/industry knowledge.
This document provides the theory date sheet for the BBA (CAM) 1st, 3rd, and 5th semester examinations in December 2010 at Maharshi Dayanand University, Rohtak. It lists the course codes, course names, and dates for each examination from the 1st semester on December 14-28, 2010, 3rd semester from December 13-27, 2010, and 5th semester from December 12-25, 2010. It also notes that students should ensure they have the correct question paper and that mobile phones and sharing calculators are not allowed in the examination center.
This document provides the theory date sheet for the BBA (CAM) 1st, 3rd, and 5th semester examinations in December 2010 at Maharshi Dayanand University, Rohtak. It lists the course codes, course names, and dates for each examination from the 1st semester on December 14-28, 2010, 3rd semester from December 13-27, 2010, and 5th semester from December 12-25, 2010. It also notes that students should ensure they have the correct question paper and that mobile phones and sharing calculators are not allowed in the examination center.
The document provides the theory examination date-sheet for various semesters of the BBA program at Maharshi Dayanand University, Rohtak for December 2010. It lists the course codes, names and dates for exams for BBA 1st, 3rd, 5th and 6th semesters under both old and new schemes. It also contains some notes for candidates regarding verifying the question papers, prohibiting mobile phones and the use of calculators.
This document introduces the Microsoft Student Tech Club at Advanced Institute of Technology and Management in Palwal. It provides an overview of Microsoft Corporation, the Microsoft Student Partners program, and the Imagine Cup competition. It describes the benefits of joining the Microsoft Student Tech Club, which includes learning Microsoft technologies, discounts on certification and courseware, and working on projects. Students from B.Tech, MCA, and MBA programs are eligible to join.
This document appears to be listing student information including name, serial number, percentages scored in high school and college courses, intended graduation degree and college/university details. The table headings indicate the student's name, serial number, 12th grade percentage, undergraduate percentage, intended graduation degree and stream, intended year of graduation, and college/university name.
This document provides an overview of courses offered at various institutes including the Advanced Institute of Technology & Management, Advanced College of Technology & Management, and Advanced Institute of Pharmacy. It lists bachelor's, master's, and diploma programs in fields such as computer science, electronics, business administration, education, and pharmacy. Laboratories for subjects like computer applications, electronics, mechanical engineering, education research, pharmacy research, and applied sciences are also detailed.
The document requests personal details including name, roll number, course, and semester from the reader in order to fill out unspecified details. It asks for basic identifying information but provides no other context about the purpose of collecting these details.
This slide is special for master students (MIBS & MIFB) in UUM. Also useful for readers who are interested in the topic of contemporary Islamic banking.
Assessment and Planning in Educational technology.pptxKavitha Krishnan
In an education system, it is understood that assessment is only for the students, but on the other hand, the Assessment of teachers is also an important aspect of the education system that ensures teachers are providing high-quality instruction to students. The assessment process can be used to provide feedback and support for professional development, to inform decisions about teacher retention or promotion, or to evaluate teacher effectiveness for accountability purposes.
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The simplified electron and muon model, Oscillating Spacetime: The Foundation...RitikBhardwaj56
Discover the Simplified Electron and Muon Model: A New Wave-Based Approach to Understanding Particles delves into a groundbreaking theory that presents electrons and muons as rotating soliton waves within oscillating spacetime. Geared towards students, researchers, and science buffs, this book breaks down complex ideas into simple explanations. It covers topics such as electron waves, temporal dynamics, and the implications of this model on particle physics. With clear illustrations and easy-to-follow explanations, readers will gain a new outlook on the universe's fundamental nature.
How to Add Chatter in the odoo 17 ERP ModuleCeline George
In Odoo, the chatter is like a chat tool that helps you work together on records. You can leave notes and track things, making it easier to talk with your team and partners. Inside chatter, all communication history, activity, and changes will be displayed.
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it describes the bony anatomy including the femoral head , acetabulum, labrum . also discusses the capsule , ligaments . muscle that act on the hip joint and the range of motion are outlined. factors affecting hip joint stability and weight transmission through the joint are summarized.
This presentation was provided by Steph Pollock of The American Psychological Association’s Journals Program, and Damita Snow, of The American Society of Civil Engineers (ASCE), for the initial session of NISO's 2024 Training Series "DEIA in the Scholarly Landscape." Session One: 'Setting Expectations: a DEIA Primer,' was held June 6, 2024.
Strategies for Effective Upskilling is a presentation by Chinwendu Peace in a Your Skill Boost Masterclass organisation by the Excellence Foundation for South Sudan on 08th and 09th June 2024 from 1 PM to 3 PM on each day.
7. Development of the GSM Standard 1982: Groupe Spécial Mobile (GSM) created 1984: Description of GSM features 1985: List of recommendations settled 1987: Initial MoU (Memorandum of Understanding) aside the drafting of technical specifications was signed by network operators of 13 countries: 1988: Validation and trials, of the radio interface. 1991: First system trials are demonstrated at the Telecom 91 exhibition. 1992: Official commercial launch of GSM service in Europe. First Launch in Finland 1993: The GSM-MoU has 62 signatories in 39 countries worldwide. 1995: Specifications of GSM phase 2 are frozen. 1999: GSM MoU joins 3GPP (UMTS) GPRS Trials begins 2000: 480M GSM Network operators Worldwide First GPRS Networks roll out End 2002: 792M GSM Net work Operators Worldwide
8. GSM Specifications 12 SERIES OPERATION AND MAINTENANCE 01 SERIES GENERAL 02 SERIES SERVICE ASPECTS 03 SERIES NETWORK ASPECTS 04 SERIES MS-BSS INTERFACE AND PROTOCOLS 05 SERIES PHYSICAL LAYER ON THE RADIO PATH. 06 SERIES SPEECH CODING SPECIFICATIONS 07 SERIES TERMINAL ADAPTERS FOR MOBILE STATIONS 11 SERIES EQUIPMENT AND TYPE APPROVAL SPECIFICATIONS 10 SERIES SERVICE INTERWORKING 09 SERIES NETWORK INTERWORKING 08 SERIES BSS TO MSC INTERFACES
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10. Wireless Data Technology Options throughput kbps 10 k 100 k 64 k 1 M 2 M 1 k 1998 1999 2000 2001 2002 Time frame UMTS GPRS HSCSD 9.6 14.4 packet GPRS = G eneral P acket R adio S ervice HSCSD = H igh S peed C ircuit S witched D ata EDGE = E nhanced D ata rate for G SM E volution UMTS = U niversal M obile T elecommunication S ystem EDGE circuit
11. Circuit-Switched or Packet-Switched Circuit mode Packet mode A -> F D -> H C -> G C -> G C -> G C -> G C -> G D -> H D -> H A -> F D -> H D -> H A -> F A -> F A -> F A B C D E F G H
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16. GSM System specifications Frequency band Uplink 890 - 915 MHz Downlink 935 - 960MHz Duplex Frequency Spacing 45MHz Carrier separation 200KHz Frequency Channels 124 Time Slots /Frame(Full Rate) 8 Voice Coder Bit Rate 13Kbps Modulation GMSK Air transmission rate 270.833333 Kbps Access method FDMA/TDMA Speech Coder RPE-LTP-LPC
17. Access Techniques Uplink 890 MHz to 915 MHz Down Link 935 MHz to 960 MHz 25 MHz divided into 125 channels of 200 KHz bandwidth 890.0 890.2 890.4 914.8 915.0 935.0 935.2 935.4 959.8 960.0 UP DOWN
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22. GSM - Network Structure AuC MS MS BTS BTS BTS BSC BSC MSC MSC VLR VLR GMSC HLR PSTN EIR Um Abis Abis A A OMC Server Um B E E X.25 C F H X.25
23. GSM Network OMC AUC HLR MSC EIR VLR BSC BTS MS External PSTN & PDN N/W SS BSS Switching System Base Station System MS Mobile Station BTS Base transceiver System BSC Base Station Controller MSC Mobile Switching Center HLR Home Location Register VLR Visitor Location Register EIR Equipment Identity Register AUC Authentication Center OMC Operation And Maintenance Center
24. GSM Architecture HLR VLR EIR AUC MSC B S C B S C SMSC PSTN VMSC Mobile Station GSM Air interface OMCR TRAU Base Station System Network and switching subsystem A interface SS7 / speech SS7 X.25 BTS BTS BTS BTS BTS BTS Abis interface A interface OMCS
25. Fundamentals GSM utilizes two bands of 25 MHz. 890-915 MHz band is used for uplink while the 935-960 MHz is used for downlink. The frequency bands are divided into 200 KHz wide channels called ARFCNs (Absolute Radio Frequency Channel Numbers) i.e. there are 125 ARFCNs out of which only 124 are used. Each ARFCN supports 8 users with each user transmitting / receiving on a particular time slot (TS). 960 MHz 959.8MHz 200KHz 935 MHz 935.2 Mhz 915 MHz 200KHz 45 MHz Downlink (TDMA frame) = 8 TS Uplink (TDMA frame) Delay TS: Time slot 914.8 MHz 890.2 MHz 890 MHz DOWNLINK UPLINK Therefore 1 TDMA frame = 156.25 x 8 = 1250 bits and has a duration of 576.92 s x 8 = 4.615 ms The technology 1 2 …… …… . 123 124 1 2 …… …… . 123 124 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 Data burst = 156.25 bit periods = 576.9 s
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36. Interfaces and Protocols Um Abis A C B E D F Digital Networks POTS TUP ISUP MAP MAP MAP BSSAP LAPD LAPDm G
39. Functional Plane of GSM MS BTS BSC MSC/ HLR GMSC VLR MS BTS BSC MSC/VLR HLR GMSC CC MM RR Trans
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48. Channels : differentiating between Physical and Logical channels Physical channels : The combination of an ARFCN and a time slot defines a physical channel. Logical channels : These are channels specified by GSM which are mapped on physical channels.
49. Channel concept Physical channel : One timeslot of a TDMA-frame on one carrier is referred to as a physical channel. There are 8 physical channels per carrier in GSM,channel 0-7(timeslot 0-7) Logical channel: A great variety of information must be transmitted between BTS and the MS,for e.g. user data and control signaling.Depending on the kind of information transmitted we refer to different logical channels.These logical channels are mapped on physical channel.
50. Logical Channels on Air interface LOGICAL CHANNELS COMMON CHANNELS DEDICATED CHANNELS BROADCAST CHANNELS COMMON CONTROL CHANNELS DEDICATED CONTROL CHANNELS TRAFFIC CHANNELS FCCH BCCH SCH SDCCH SACCH FACCH PCH AGCH RACH TCH/F TCH/EFR TCH/H
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64. Speech Coding BP A/D SPEECH ENCODER CHANNEL CODING LP D/A SPEECH DECODER CHANNEL DECODING BAND PASS 300 Hz - 3.4 kHZ Every 125 s value is sampled from analog signal and quantised by 13 bit word Data rate = 13/125*10 -6 = 104 kbps Every 20ms 160 samples taken Data rate = 160 * 13/20ms = 104 kbps Linear Predictive Coding & Regular Pulse Excitation Analysis 1. Generates 160 filter coeff 2. These blocks sorted in 4 sequence 1,5,9,…37 / 2,6,10----38/ 3,7,11…39/8,12,16…40 3. Selects the sequence with most energy So data rate = 104/4 = 26 kbps Long term prediction analysis 1. Previous sequences stored in memory 2. Find out the correlation between the present seq. And previous sequences 3. Select the highest correlation sequence 4. Find a value representing the difference between the two sequences. Reduces data rate = 26 kbps/2 = 13 kbps ie 260 bits in 20ms 50 132 78 1A 1B 2 1A = Filter Coeff block ampl, LTP params 1B = RPE pointers & pulses 2 = RPE pulse & filter params 50 3 132 4 3 crc bits Four 0 bits for codec 378 coded bits Conv coding rate = 1/2 delay = 4 78 456 bits in 20 ms = 22.8 kbps 57 x 8 = 456 To modulator
67. Normal Burst T 3 Coded Data 57 S 1 T. Seq. 26 S 1 Coded Data 57 T 3 GP 8.25 Tail Bit(T) :Used as Guard Time Coded Data :It is the Data part associated with the burst Stealing Flag :This indicates whether the burst is carrying Signaling data (FACCH) or user info (TCH). Training Seq. :This is a fixed bit sequence known both to the BTS & the MS.This takes care of the signal deterioration. 156.25 bits 0.577 ms
68. T 3 Training Sequence 41 Coded Data 36 T 3 GP 68.25 Random Access Burst T 3 Fixed Bit Sequence 142 T 3 GP 8.25 T 3 Coded Data 39 Training Sequence 64 Coded Data 39 T 3 GP 8.25 Synchronization Burst 156.25 bits 0.577 ms 156.25 bits 0.577 ms 156.25 bits 0.577 ms Freq. Correc. Burst
77. MS Location Update (registration) MS BTS BSC (G)MSC VLR HLR Action Channel Request (RACH) Channel Assignment (AGCH) Authentication Request (SDCCH) Authentication Response (SDCCH) Comparison of Authentication params Accept LUP and allocTMSI (SDCCH) Ack of LUP and TMSI (SDCCH) Entry of new area and identity into VLR and HLR Channel Release (SDCCH) Location Update Request (SDCCH) TMSI + old LAI
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83. MS MS BTS BTS BTS BSC BSC MSC VLR GMSC HLR PSTN EIR AuC Mobile Originated Call Req for dedicated channel for signaling (RACH) Give SDCCH Allocates SDCCH using the AGCH Sends call set-up request including dialled digits on SDCCH Call set-up forwarded to BSC Call set-up forwarded to MSC Authentication request (SDCCH) Authentication response (SDCCH) Authentication response (SDCCH) Assigns TCH Req Activate TCH TCH assigned Assn complete Release SDCCH SDCCH released ACM Ring tone over FACCH Ring alert Called Sub answers Connect message Ring tone ceases over FACCH Speech path enabled
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85. Mobile Terminated Call Authentication and Ciphering procedure done as seen in Location Updation MS MS BTS BTS BTS BSC BSC MSC VLR GMSC HLR PSTN EIR AuC Land to Mobile call (MSISDN) Query for VLR info Reply (MSRN) Route to MSC Query VLR for LAC and TMSI Paging the area (+TMSI) TMSI Paged on PCH Paging Ch. REQ over RACH Allocate SDCCH over AGCH Page RESP on SDCCH ( TMSI + LAI) Page RES Page RES Assign. REQ Assignment CMD (= TCH) on SDCCH * MS tunes * Assgn CMP * Phone rings Connect traffic Ch.to trunk frees SDCCH Assgn CMP Network Alerting
86.
87.
88.
89. Power Control BTS commands MS at different distances to use different power levels so that the power arriving at the BTS’s Rx is approximately the same for each TS - Reduce interference - Longer battery life
93. Periodic Measurement Reports (SACCH) Cell 1 Cell 2 BSC BTS 1 BTS 2 Intra BSC handover Periodic Measurement Reports (SACCH) Periodic Measurement Reports HO required Activate TCH(facch) with HoRef# if 1. Check for HO passed 2. Channel avail in new BTS Acknowledges and alloctes TCH (facch) HO cmd with HoRef# Receives new BTS data(FACCH) MS tunes into new frequency and TS and sends HO message to new BTS (facch) HO performed Release TCH
99. Location Updates Location Updates can be classified into two: Periodic Location Updates: This occurs as per the timer set by the network operator. If the MS does not perform this update the MSC marks the MS as ‘Detached’ on the VLR. Location Update on a handover: This occurs if during a handover the MS is moved into a new Location Area Code (LAC).
Editor's Notes
1982 : CEPT (Conférence Européenne des Administrations des Postes et Télécommunications) decides to establish a "Groupe Spécial Mobile" (the initial origin of the Term GSM) to develop a set of common standards for a future pan-European Cellular Mobile Network. 1984 : Establishment of three Working Parties to define and describe GSM features: the radio interface, transmission and signaling protocols, interfaces and network architecture. 1985, 1986 : Discussion and adoption of a list of recommendations to be generated by the Group Spécial Mobile. A so-called permanent nucleus is established to continuously coordinate the work, which is intensely supported by industry delegates. Much thought goes into developing a radio transmission prototype.
One important question was how far GSM should go in its specification work; that is, to what degree the system had to be specified so as to be identical in all countries, and how much could be left to the operators and suppliers to agree upon. Clearly, without identical air interfaces in all networks, the subscribers were not going to have free roaming between networks. This was considered to be the absolute minimum degree of standardization, and this solution was favored. It might have been seen to be advantageous to specify everything in the system, including the hardware and the mobile station and even other parts of the system. It was agreed however that there would be no attempt to specify the system in such detail. Basically, only the functional interfaces between the major buildings blocks would be specified. This approach had several advantages, perhaps the most important of which is that for each major building block, the principle of functional specifications offers each operator, and thus the customer, the opportunity to purchase whatever make of equipment he wants, thus setting the stage for maximum competition between manufacturers. For instance the fact that an operator has purchased an exchange from a certain supplier does not force him to go on buying equipment from the same supplier. Standardized electrical interfaces as well as protocols were provided for both the fixed network and subscriber equipment. These included standardized rate adaptations compatible with conventional ISDN (Integrated Services Digital Network) definitions.
GSM phase 2 We can currently use a data terminal attached to an MS to connect to any standard data service provided by the PSTN, ISDN or PDN networks as long as the network accepts a data rate of 9.6 kbps and the Inter-Working Function (IWF) is installed. This includes access to the Web, e-mail, fax etc.. Use of these facilities is generally limited due to the speed of the communication. Internet use is expensive and slow due to the limited data rate and the circuit switched nature of the GSM system. The BSS provides two modes: transparent data service, non transparent data service, using RLP protocol between the MS and the IWF. GSM phase 2+ A new service has been standardized in ETSI to reach 14.4 kbps user rate on one TS. This new data rate is the result of a new channel coding on the radio interface. This enhancement is a part of a global strategy aimed at offering higher data rates and called High Speed Circuit Switched Data (HSCSD). HSCSD allows 14.4 kbps in one TS and up to 56 kbps in the future, using multiple TSs. It is however, still a circuit switched system which will supply expensive connections unless the operators pricing schemes are imaginative. It will help those who use data over GSM today and encourage others to use the services but it does involve a capacity penalty for the network.
Today, GSM has the capability to handle messages via the Short Message Service SMS and a 14.4 kbps circuit switched data service for data/fax calls. This maximum speed of 14.4 kbps is relatively low compared to wireline modem speeds of 34.4 and even 56 kbps. To enhance the current data capabilities of GSM, operators and infrastructure providers have specified new extensions to GSM phase 2: High Speed Circuit Switched Data (HSCSD) by using several circuit channels. General Packet Radio Service (GPRS) to provide packet radio access to external Packet Data Networks (Internet or X.25 networks). Enhanced Data rate for Gsm Evolution (EDGE), using a new modulation scheme, to allow up to three times higher throughput (for HSCSD and GPRS). Universal Mobile Telecommunication System (UMTS) , a new wireless technology but utilizing new infrastructure deployment. These extensions enable: higher data throughput, better spectral efficiency, lower call setup times.
The typical internet data traffic is characterized by an ON/OFF model. The user spends a certain amount of time downloading web pages in quick succession followed by indefinite periods of inactivity. During this inactivity the end-user may read the information or think or do something else. The traffic is sporadic and can be characterized as data packets of average size 16 kbytes/s with average intervals of 7 seconds. If a circuit switch connection is used to access the Internet, the bandwidth dedicated for the entire duration of the session is under-utilized.