This document provides an overview of the GSM network architecture. It describes the key components and their functions, including cells, location areas, MSC service areas, PLMN service areas, and the GSM service area. It also discusses the relationships between these areas. Additionally, it explains the roles of key network elements like the mobile station, base station subsystem, visitor location register, home location register, equipment identity register, authentication center, and operations and maintenance center.
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 global system for mobile communications (GSM) is a set of recommendations and specifications for a digital cellular telephone network (known as a Public Land Mobile Network, or PLMN). These recommendations ensure the compatibility of equipment from different GSM manufacturers, and interconnectivity between different administrations, including operations across international boundaries
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.
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 global system for mobile communications (GSM) is a set of recommendations and specifications for a digital cellular telephone network (known as a Public Land Mobile Network, or PLMN). These recommendations ensure the compatibility of equipment from different GSM manufacturers, and interconnectivity between different administrations, including operations across international boundaries
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(Global system for mobile communication ) is a second generation cellular standard developed to cater voice services and data delivery using digital modulation.
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2. Network Structure
• Cell
A cell is the basic unit of a cellular
system and is defined as the radio
coverage given by one BTS.
2
3. Network Structure
LOCATION AREA
A LA is defined as a group of cells.Within the
network, a subsriber’s location is known by the LA
which they are in.
The identity of the LA in which an MS is currently
located is stored in the VLR. (LAI)
3
4. Network Structure
• MSC Service Area
An MSC Service Area is made up of
LAs and represents the
geographical part of the network
controlled by one MSC.
4
5. Network Structure
• PLMN SERVICE AREA
A PLMN service area is the entire set of
cells served by one network operator
and is defined as the area in which an
operator offers radio coverage and
access to its network.
5
6. Network Structure
• GSM SERVICE AREA
The GSM service area is the entire
geographical area in which a subscriber
can gain access to a GSM network.
6
7. Relation between areas in GSM
Location Area
Cell
Location Area
MSC Service Area
PLMN Service Area
GSM Service Area
7
9. Functions of Mobile Station
• Voice and data transmission & receipt
• Frequency and time synchronization
• Monitoring of power and signal quality
of the surrounding cells
• Provision of location updates even
during inactive state
9
10. Mobile Station
• Can receive, store, send SMS up to 160
characters.
• MS identified by unique IMEI shown on
pressing *#06#.
• Power levels of 20W, 8W, 5W, 2W
and .8W
10
11. SIM
SIM has microprocessor and memory.
Fixed data stored for the subscription:
• IMSI,
• Authentication Key, Ki
• Security Algorithms:kc,A3,A8
• PIN & PUK
11
13. IMEI
• International Mobile Equipment
Identity
• The IMEI is an unique code allocated to each
mobile equipment. It is checked in the EIR.
• IMEI check List
• White List
• Grey List
• Black List
13
14. MSISDN
• Mobile Station ISDN Number
• The MSISDN is registered in the telephone directory and
used by the calling party for dialing.
• MSISDN shall not exceed 15 digits.
• NDC--National Destination Code
• SN--Subscriber Number
1 to 3 digits Variable Variable
CC NDC SN
14
15. IMSI
• International mobile subscriber
Identity
• The IMSI is an unique identity which is used
internationally and used within the network to
identify the mobile subscribers.
• The IMSI is stored in the subscriber identity
module (SIM), the HLR, VLR database.
15
16. Temporary Mobile subscriber Identity
• TMSI is a temporary IMSI no. made known to
an MS at registration.
• The VLR assigns a TMSI to each mobile
subscribers entering the VLR area.
• Assigned only after successful authentication.
16
17. MSRN
Mobile Station Roaming Number
• The MSRN is used in the GMSC to set up a
connection to the visited MSC/VLR.
• MSRN--is a temporary identity which is
assigned during the establishment of a call to
a roaming subs.
17
19. FUNCTIONS OF BTS (
Base Transceiver Station)
• Radio resources
• Signal Processing
• Signaling link management
• Synchronization
• Local maintenance handling
• Functional supervision and Testing
19
20. FUNCTIONS OF BSC
• Radio Resource management
• Internal BSC O&M
• Handling of MS connections
20
22. Transcoder
Is a device that takes 13 KBPS speech
data and multiplexes four of them into
standard 64 Kbps data.
22
23. Switching System (SS)
SS7 Signalling
Traffic Path VLR D
C HLR AUC
F
E
Other
EIR A
MSC MSC
(PSTN)
(BSS)
23
24. MSC Functions
• Switcing and call routing
• Charging
• Service provisioning
• Communication with HLR
• Communication with VLR
• Communication with other MSCs
• Control of connected BSCs
24
25. MSC Functions
• Echo canceller operation control
• Signaling interface to databases like HLR, VLR.
• Gateway to SMS between SMS centers and
subscribers
• Handle interworking function while working as
GMSC
25
26. VISITOR LOCATION REGISTER (VLR)
• It contains data of all mobiles roaming in its
area.
• One VLR may be incharge of one or more LA.
• VLR is updated by HLR on entry of MS its area.
• VLR assigns TMSI which keeps on changing.
26
27. Data in VLR
• IMSI & TMSI
• MSISDN
• MSRN.
• Location Area
• Supplementary service parameters
• MS category
• Authentication Key
27
28. Home Location Register(HLR)
• Reference store for subscriber’s parameters,
numbers, authentication & Encryption values.
• Current subscriber status and associated VLR.
• Both VLR and HLR can be implemented in the
same equipment in an MSC.
• one PLMN may contain one or several HLR.
28
29. Home Location Register(HLR)
• Permanent data in HLR
• Data stored is changed only by commands.
• IMSI, MS-ISDN number.
• Category of MS ( whether pay phone or not )
• Roaming restriction ( allowed or not ).
• Supplementary services like call forwarding
29
30. Home Location Register(HLR)
• Temporary data in HLR
• The data changes from call to call & is dynamic
• MSRN
• RAND /SRES and Kc
• VLR address , MSC address.
• Messages waiting data used for SMS
30
31. EQUIPMENT IDENTITY REGISTER ( EIR )
• This data base stores IMEI for all registered
mobile equipments and is unique to every ME.
• Only one EIR per PLMN.
• White list : IMEI, assigned to valid ME.
• Black list : IMEI reported stolen
• Gray list : IMEI having problems like faulty
software, wrong make of equipment etc.
31
32. AUthentication Center (AUC)
To authenticate the subs. attempting to use a
network.
AUC is connected to HLR which provides it
with authentication parameters and ciphering
keys used to ensure network security.
32
33. AUC Functions
To perform subscriber
authentication and to establish
ciphering procedures on the radio
link between the network and MS.
33
34. AUC Functions
Information provided is called a
TRIPLET consists of:
• RAND(non predictable random number)
• SRES(Signed response)
• Kc(ciphering key)
34
35. Operations and Maintenance Centre
OMC
The centralized operation of the various units in
the system and functions needed to maintain the
subsystems.
Dynamic monitoring and controlling of the
network
35
36. Functions Of OMC
-O&M data function
-Configuration management
--Fault report and alarm handling
-Performance supervision/management
-Storage of system software and data
36