This document provides a summary of a seminar presentation on practical training at Bharat Sanchar Nigam Limited (BSNL) in India. It discusses that BSNL is the 4th largest telecommunications company in Asia and 7th largest worldwide, provides GSM and basic telephony services, and has over 300,000 employees. It also reviews BSNL's company profile and provides overviews of wireless networking technologies, cellular network evolution, GSM standards and architecture including frequency bands and network components.
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.
GPRS Architecture and its components are covered extensively.
The slides give a little information about gprs and also gets into deeper explanation of its architecture.
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.
GPRS Architecture and its components are covered extensively.
The slides give a little information about gprs and also gets into deeper explanation of its architecture.
The GSM network is comprised of the following components:
Network Elements
The GSM network incorporates a number of network elements to support mobile equipment. They are listed and described in the GSM network elements section of this chapter.
GSM subsystems
In addition, the network includes subsystems that are not formally recognized as network elements but are necessary for network operation. These are described in the GSM subsystems (non-network elements) section of this chapter.
Standardized Interfaces
GSM specifies standards for interfaces between network elements, which ensure the connectivity of GSM equipment from different manufacturers. These are listed in the Standardized interfaces section of this chapter.
Network Protocols
For most of the network communications on these interfaces, internationally recognized communications protocols have been used
These are identified in the Network protocols section of this chapter.
GSM Frequencies
The frequency allocations for GSM 900, Extended GSM and Digital Communications Systems are identified in the GSM frequencies section of this chapter.
GSM networks are digital and can cater for high system capacities. They are consistent with the world wide digitization of the telephone network, and are an extension of the Integrated Services Digital Network (ISDN), using a digital radio interface between the cellular network and the mobile subscriber equipment
The GSM system provides a greater subscriber capacity than analogue systems. GSM allows 25 kHz. Per user, that is, eight conversations per 200kHz. Channel pair (a pair comprising one transmit channel and one receive channel). Digital channel coding and the modulation used makes the signal resistant to interference from the cells where the same frequencies are re-used (co-channel interference); a Carrier to Interference Ratio (C/I) level of 9 dB is achieved, as opposed to the 18 dB typical with analogue cellular. This allows increased geographic reuse by permitting a reduction in the number of cells in the reuse pattern. Since this number is directly controlled by the amount of interference, the radio transmission design can deliver acceptable performance.
General Packet Radio Service (GPRS) is a new bearer service for GSM that greatly improves and simplifies wireless access to packet data networks.General Packet Radio Service (GPRS) is a new bearer service for GSM that greatly improves and simplifies wireless access to packet data networks
GPRS applies packet radio principal to transfer user data packets in an efficient way b/w MS & external packet data network
GPRS applies packet radio principal to transfer user data packets in an efficient way b/w MS & external packet data network
Global system for mobile communication(GSM)Jay Nagar
~Introduction
~GSM Architecture
~GSM Entities
~SMS Service In GSM
~Call Routing In GSM
~PLMN Interfaces
~GSM Addresses and Identifiers
~Network aspects in GSM
~Handover
~Mobility Management
~GSM Frequency Allocation
~Authentication and Security In GSM
The GSM network is comprised of the following components:
Network Elements
The GSM network incorporates a number of network elements to support mobile equipment. They are listed and described in the GSM network elements section of this chapter.
GSM subsystems
In addition, the network includes subsystems that are not formally recognized as network elements but are necessary for network operation. These are described in the GSM subsystems (non-network elements) section of this chapter.
Standardized Interfaces
GSM specifies standards for interfaces between network elements, which ensure the connectivity of GSM equipment from different manufacturers. These are listed in the Standardized interfaces section of this chapter.
Network Protocols
For most of the network communications on these interfaces, internationally recognized communications protocols have been used
These are identified in the Network protocols section of this chapter.
GSM Frequencies
The frequency allocations for GSM 900, Extended GSM and Digital Communications Systems are identified in the GSM frequencies section of this chapter.
GSM networks are digital and can cater for high system capacities. They are consistent with the world wide digitization of the telephone network, and are an extension of the Integrated Services Digital Network (ISDN), using a digital radio interface between the cellular network and the mobile subscriber equipment
The GSM system provides a greater subscriber capacity than analogue systems. GSM allows 25 kHz. Per user, that is, eight conversations per 200kHz. Channel pair (a pair comprising one transmit channel and one receive channel). Digital channel coding and the modulation used makes the signal resistant to interference from the cells where the same frequencies are re-used (co-channel interference); a Carrier to Interference Ratio (C/I) level of 9 dB is achieved, as opposed to the 18 dB typical with analogue cellular. This allows increased geographic reuse by permitting a reduction in the number of cells in the reuse pattern. Since this number is directly controlled by the amount of interference, the radio transmission design can deliver acceptable performance.
General Packet Radio Service (GPRS) is a new bearer service for GSM that greatly improves and simplifies wireless access to packet data networks.General Packet Radio Service (GPRS) is a new bearer service for GSM that greatly improves and simplifies wireless access to packet data networks
GPRS applies packet radio principal to transfer user data packets in an efficient way b/w MS & external packet data network
GPRS applies packet radio principal to transfer user data packets in an efficient way b/w MS & external packet data network
Global system for mobile communication(GSM)Jay Nagar
~Introduction
~GSM Architecture
~GSM Entities
~SMS Service In GSM
~Call Routing In GSM
~PLMN Interfaces
~GSM Addresses and Identifiers
~Network aspects in GSM
~Handover
~Mobility Management
~GSM Frequency Allocation
~Authentication and Security In GSM
Strategy Analysis on BSNL.
Bharat Sanchar Nigam Limited (abbreviated BSNL) is India's oldest and largest communication service provider and is state owned telecommunications company headquartered in New Delhi ,India
Wireless communications is a type of data communication that is performed and delivered wirelessly. This is a broad term that incorporates all procedures and forms of connecting and communicating between two or more devices using a wireless signal through wireless communication technologies and devices.
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1. Seminar on Practical Training at
BSNL
Presented by:
Ayush Anand
B.Tech , ECE , 7th Sem
Sri Balaji College of Engineering &Technology, Jaipur
“Telecommunication”
2. Introduction
• 4th largest telecommunication company in Asia and 7th largest in the world.
• Provides GSM and basic telephony service and first company in India
providing 3G technology.
• More than 3 lacs of employees, officers and engineers are working at
present.
Glimpse at Company Profile
3. WHAT IS WIRELESS ?
The word wireless is dictionary defined “having
no wires ” .
In networking terminology , wireless is the
term used to describe any computer network
where there is no physical wired connection
between sender and receiver, but rather the
network is connected by radio waves and or
microwaves to maintain communications.
Wireless networking utilizes specific
equipment such as NICs and Routers in place of
wires (copper or optical fibre).
5. Frequency Division Multiple Access
• Each mobile is assigned a separate frequency channel for the
duration of the call.
• Sufficient guard band is required to prevent adjacent channel
interference.
• Usually, mobile terminals will have one downlink frequency band
and one uplink frequency band
• Different cellular network protocols use different frequencies
6. Time Division Multiple Access
• Time is divided into slots and only one mobile terminal transmits
during each slot.
• Each user is given a specific slot. No competition in cellular network
7. Code Division Multiple Access
• Use of orthogonal codes to separate different transmissions
• Each symbol of bit is transmitted as a larger number of bits using
the user specific code – Spreading
• Bandwidth occupied by the signal is much larger than the information
transmission rate
• But all users use the same frequency band together
Orthogonal among users
10. GSM Services
• Voice, 3.1 kHz
• Short Message Service (SMS)
• 1985 GSM standard that allows messages of at most 160 chars. (incl.
spaces) to be sent between handsets and other stations
• Over 2.4 billion people use it; multi-billion $ industry
• General Packet Radio Service (GPRS)
• GSM upgrade that provides IP-based packet data transmission up to
114 kbps
• Users can “simultaneously” make calls and send data
• GPRS provides “always on” Internet access and the Multimedia
Messaging Service (MMS) whereby users can send rich text, audio,
video messages to each other
• Performance degrades as number of users increase
• GPRS is an example of 2.5G telephony – 2G service similar to 3G
11. GSM Frequencies
• Originally designed on 900MHz range, now also
available on 800MHz, 1800MHz and 1900 MHz
ranges.
• Separate Uplink and Downlink frequencies
• One example channel on the 1800 MHz frequency band,
where RF carriers are space every 200 MHz
1710 MHz 1880 MHz1805 MHz1785 MHz
UPLINK FREQUENCIES DOWNLINK FREQUENCIES
UPLINK AND DOWNLINK FREQUENCY SEPARATED BY 95MHZ
13. Network subsystem
Performs call processing and subscriber
related functions. It includes:
MSC: Mobile Switching Centre
HLR: Home Location Register
VLR :Visitor Location Register
AuC: Authentication Centre
EIR: Equipment Identity Register
GMSC:Gateway MSC.
14. The functions carried out by the MSC are listed below:
Call Processing
Call Switching
Operations And Maintenance Support
Internetwork Networking
When the MSC provides the interface with the other networks
in the GSM network it is known as a Gateway MSC.
Mobile Switching Centre
15. Subscriber ID (IMSI & MSIN).
Current location of subscriber.
Subscriber status
(registered/unregistered)
Authentication key and AUC
functionality.
Mobile subscriber roaming number.
Home Location Register
16. • Provides local database for subscriber when they are away from
home.
It contains:
• Mobile status(busy/free/no ans)
• Location area identity(LAI)
• TMSI AND MSIN .
Visitor Location Register
17. • Provides authentication and encryption.
• Ensures confidentiality of each cell.
• Protects network operators from frauds.
• Associated with HLR.
• Takes place each time the subscriber initializes” on
the system.
Authentication Centre
18. • Centralized database for validating the IMEI
(International Mobile Station Eqipment Identity).
• It contains three lists-
White List
Black List
Grey List
Eqipment Identity Register
19. Base Transceiver Station
• Maintains air interface and
minimize transmission
problems.
• Radio level power control.
• BTS identification.
• Ciphering (Encryption).
• Speech processing.
20. Base Station Controller
It is connected to MSC.
Controls one or more BTS.
Switches traffic and
signaling to/from BTSs and
MSC.
Controls handover
performed by BTS.
Frequency allocation and
power control.
21. • A leased line is a telecommunications path between two
points that is available 24 hours a day for use by a
designated user (Individual or company).
• These leased lines can carry data, voice and video
information. It is not shared in common among multiple
users as dialup line.
DEPARTMENT : MLLN
22. DEPARTMENT : C-DOT
• It stands for Center for Development of Telematics
• Digital Telephone Exchange runs on this technique
• Call processing of Landline Networks
• STD / ISD / LOCAL