OMA000001 GSM Fundamentals ISSUE4.0-New
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OMA000001
GSM Fundamentals
ISSUE 4.0
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Upon completion of this course, you will be able to:
Grasp basic idea of GSM system such asfrequency spectrum, frequency reuse etc.
Grasp the structure of the GSM system and the
protocol used.
Grasp certain numbers that refer to BSS
Grasp the 4 kinds of channel combination and
understand the idea of multi-frame.
Know some radio techniques
Get the idea of EDGE
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References
BSS Feature Description
BSS Signaling Analysis Manual
BSC Technical Manual
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Chapter 1 GSM System OverviewChap
ter 1 GSM System Overview
Chapter 2 GSM Network StructureChapter 2 GSM Network Structure
Chapter 3Chapter 3 Service Area and Number PlanningService Area and Number Planning
Chapter 4Chapter 4 Channels on the Wireless InterfaceChannels on the Wireless Interface
Chapter 5 Radio TechniquesChapter 5 Radio Techniques
Chapter 6 GPRS & EDGE IntroductionChapter 6 GPRS & EDGE Introduction
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GSM system overview
The GSM system is a frequency- and time-division cellular system,
each physical channel is characterized by a carrier frequency and a
time slot number
Cellular systems are designed to operate with groups of low-power
radios spread out over the geographical service area. Each group ofradios serve MSs presently located near them. The area served by
each group of radios is called a CELL
Uplink and downlink signals for one user are assigned different
frequencies, this kind of technique is called Frequency Division Duplex
(FDD)
Data for different users is conveyed in time intervals called slots ,
several slots make up a frame. This kind of technique is called Time
Division Multiple Access (TDMA)
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GSM Development
Standard Protocol for GSM take effect
System was named as Global System for
Mobile Communication
GSM system began to provide service in Europe(2G)
Provide services for the whole world
Micro Cell Technique is used in GSM system
1989
1991
1992
1994
1996
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Cell Technique
A certain radio coverage area formed by a set of transceivers that
connected to a set of antennas is called a CELL.
Macro Cell
In the beginning , High-Power BTSs are adopted to provide services.
The BTS covers a wider area , but its frequency utilization is not
efficient. So , it can only provide a few channels for subscribers.
Micro Cell
Later the Low-Power BTS joins the system for getting a better servicearea with high capacity . At the same time it adopts the frequency
reuse technique to improve the efficiency of the frequency utilization
and also the whole capacity of the network.
Macro Cell and Micro CellMacro Cell and Micro Cell
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Multiple Access Technique
Multiple Access Technique allows many subscribers to use the
same communication medium.
There are three kinds of basic Multiple Access Technique :
FDMA , TDMA and CDMA.
GSM system adopt FDD-TDMA (FDMA and TDMA together).
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FDMA
FDMA uses different frequency
channels to accomplish
communication.
The whole frequency spectrum
available is divided into many
individual channels (for transmitting
and receiving) every channel can
support the traffic for one subscriber
or some control information.
Frequency
Time
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TDMA
TDMA accomplishes the
communication in different
timeslot.
A carrier is divided intochannels based on time.
Different signals occupy
different timeslots in certain
sequence , that is , many
signals are transmitted onthe same frequency in
different time.Time
Frequency
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CDMA
CDMA accomplishes the
communication in different
code sequences.
Special coding is adopted
before transmission, thendifferent information will
lose nothing after being
mixed and transmitted
together on the same
frequency and at the
same time.Time
Frequency
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GSM 900GSM 900
Duplex Separation: 45MHzChannel Bandwidth: 200KHz
The Frequency Spectrum
Uplink
890 915 935 960MHz
Downlink
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Duplex Separation: 95MHzChannel Bandwidth: 200KHz
Base Station Receive
1710 1785 1805 1880MHz
Base Station Transmit
DCS 1800DCS 1800
The Frequency Spectrum
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The Frequency Spectrum
FrequencySpectrum
Range (MHz) Uplink Frequency FrequencyPoint Available
DownlinkFrequency
GSM 450 450.4~457.6460.4~467.6
Fu(n)=450.6+0.2(n-259) 259
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Frequency Reuse
The frequency resource of mobile system is very limited.
The different Subscribers can use the same frequency in
different places.
The quality of communication must be ensured.
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Frequency Reuse
7(Site)X 1(Cell) reuse
2
1
2
3
4
5
6
7
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4 site X 3 cells reuse
1
8
9
210
46
53
7
11
12
R
Frequency Reuse
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Cell Types
Omni
1
120degree
1
23
Omni-directional CellOmni-directional Cell
120 Degree Cell120 Degree Cell
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Chapter 1 GSM System OverviewChapter 1 GSM System Overview
Chapter 2 GSM Network StructureChapter 2 GSM Network Structure
Chapter 3Chapter 3 Service Area and Number PlanningService Area and Number Planning
Chapter 4Chapter 4 Channels on the Wireless InterfaceChannels on the Wireless Interface
Chapter 5 Radio TechniquesChapter 5 Radio Techniques
Chapter 6 GPRS & EDGE IntroductionChapter 6 GPRS & EDGE Introduction
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GSM-GPRS Network Component
GSM /GPRS BSS
BTS
BSC
BTS
BSC
PCU
SS7
SMS system
PSTN
ISDN
Internet,
Intranet
MSC/VLR GMSC
HLR/AUC
SGSN
CGBG
GGSN
GPRS Backbone
Other PLMN
MS
MS
OMC
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Interface Between Different Entities
GSM /GPRS BSS
BTS
BSC
BTS
BSC
PCU
SS7
SMS system
PSTN
ISDN
Internet,
Intranet
MSC/VLR GMSC
HLR/AUC
SGSN
CGBG
GGSN
GPRS backbone
Other PLMN
A
Gb
Gi
Gp
C/D/Gs
Gr/Gs/Gd/GeGc
Ga
Abis
Um
MS
MS
OMC
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Mobile StationMS
International Mobile Equipment Identity (IMEI)
Mobile Equipment
MS=ME+SIMMS=ME+SIM
International Mobile Subscriber Identity (IMSI)
Subscriber Identity Module
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Subscriber Identity Module SIM
International Mobile Subscriber Identity (IMSI)
Temporary Mobile Subscriber Identity (TMSI)
Location Area Identity (LAI)
Subscriber Authentication Key (Ki)
SIM
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BTSBTS
BSCBSC
TC/SMTC/SM
BSS
MSC
Base Station Subsystem BSS
The Base Station Controller
BSC
The Base Transceiver Station
BTS
The Trans-coder TC and
Sub multiplexer (SM)
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BTSBTS
BSCBSC
TC/SMTC/SM
BSS
MSC
Packet Control Unit-----PCU
Packet data
switching
Bridge between
SGSN and BSC
Provide Pb and
Gb interface
GPRS
Backbone
PCUPCU SGSNSGSN
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Mobile-service Switching Center MSCHome Location Register HLRVisitor Location Register VLREquipment Identity Register EIRAuthentication Center AUCEcho Cancellor EC
AUCAUC
HLRHLR
MSC/VLRMSC/VLR
PSTN
NSS
EIREIROMC
BSS
ECEC
The Network Switching System
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Mobile-service Switching Center MSC
Call Processing
Operations and Maintenance Support
Interface management Inter-network & Inter-working
Billing
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Home Location Register HLR
Subscriber ID (IMSI and MSISDN)
Current subscriber VLR (current location)
Supplementary service information
Subscriber status (registered/deregistered)
Authentication key and AuC functionality
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Visitor Location Register VLR
Mobile Status (IMSI attached / detached / busy / idle etc.)
Location Area Identity(LAI)
Temporary Mobile Subscriber Identity(TMSI)
Allocating the Roaming Number
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IMEI is Checked In White List
IMEI is Checked in Black/Grey List
If NOT found
EIR focus on the
equipment , not the
subscriber!!
Equipment Identity Register EIR
White List
Black List
Grey List
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OMC Functional Architecture
OS
MMI
DB
Event/Alarm
Management
Security
Management
Configuration
Management
PerformanceManagement
Fault
Management
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Chapter 1 GSM System OverviewChapter 1 GSM System Overview
Chapter 2 GSM Network StructureChapter 2 GSM Network Structure
Chapter 3Chapter 3 Service Area and Number PlanningService Area and Number Planning
Chapter 4Chapter 4 Channels on the Wireless InterfaceChannels on the Wireless Interface
Chapter 5 Radio TechniquesChapter 5 Radio Techniques
Chapter 6 GPRS & EDGE IntroductionChapter 6 GPRS & EDGE Introduction
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Service Area
PLMN service area
......
Service Area
MSC service area...
Location area...
cell
PLMN service area PLMN service area
MSC service area...
Location area...
cell
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LAI
Location Area Identification
The LAI is the international code for a location area.
MCC: Mobile Country Code It consists of 3 digits .For example: The MCC of China is "460"
MNC: Mobile Network Code It consists of 2 digits .For example: The MNC of China Mobile is "00"
LAC: Location Area Code It is a two bytes hex code.The value 0000 and FFFF is invalid.
For example: 460-00-0011
MCC MNC LAC
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CGI
The CGI is a unique international identification for a cellThe format is LAI+CI
LAI: Location Area Identification
CI: Cell Identity. This code uses two bytes hex code to
identify the cells within an LAI.For example : 460-00-0011-0001
CGI: Cell Global Identification
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BSIC
NCC: PLMN network color code. It comprises 3 bit. It
allows various neighboring PLMNs to be
distinguished.BCC: BTS color code. It comprises 3 bit, used to
distinguish different cells assigned the same
frequency!
NCC BCC
BSIC
BSIC Base Station Identification Color Code)
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CC: Country Code. For example: The CC of China is "86".
NDC: National Destination Code. For example: The NDC of
China Telecom is 139, 138, 137, 136, 135.
SN: Subscriber Number. Format:H0 H1 H2 H3 ABCD
Example: 86-139-0666-1234
MSISDN
CC NDC SN
National (significant)
Mobile number
Mobile station internationalISDN number
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MCC: Mobile Country Code It consists of 3 digits .For example: The MCC of China is "460"
MNC: Mobile Network Code It consists of 2 digits .For example: The MNC of China Telecom is "00"
MSIN: Mobile Subscriber Identification Number. H1H2H3 S ABCDEFFor example: 666-9777001
NMSI: National Mobile Subscriber Identification MNC and MSINform it together.
For Example of IMSI : 460-00-666-9777001
Not more than 15 digits
3 digits 2 digits
IMSI
MCC MNC MSIN
NMSI
IMSI
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TMSI
The TMSI is assigned only after successful subscriber
authentication.
The VLR controls the allocation of new TMSI numbers and notifies
them to the HLR.
TMSI is used to ensure that the identity of the mobile subscriber on
the air interface is kept secret.
The TMSI consists of 4 bytes( 8 HEX numbers) and determined bythe operator.
TMSI: Temporary Mobile Subscriber Identification)
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IMEI
TAC FAC SNR SP
IMEI
IMEI: International Mobile Station Equipment Identification
TAC: Type approval code, 6 bit, determined by the type approval center
FAC: Final assembly code, 2 bit, It is determined by the manufacturer.
SNR: Serial number, 6 bits, It is issued by the manufacturer of the MS.
SP: 1 bit , Not used.
Check the IMEI in your MS : *#06#
TAC: Type approval code, 6 bit, determined by the type approval center
FAC: Final assembly code, 2 bit, It is determined by the manufacturer.
SNR: Serial number, 6 bits, It is issued by the manufacturer of the MS.
SP: 1 bit , Not used.
Check the IMEI in your MS : *#06#
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Chapter 1 GSM System OverviewChapter 1 GSM System Overview
Chapter 2 GSM Network StructureChapter 2 GSM Network Structure
Chapter 3Chapter 3 Service Area and Number PlanningService Area and Number Planning
Chapter 4Chapter 4 Channels on the Wireless InterfaceChannels on the Wireless Interface
Chapter 5 Radio TechniquesChapter 5 Radio Techniques
Chapter 6 GPRS & EDGE IntroductionChapter 6 GPRS & EDGE Introduction
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2 30 16 74 52 3
The physical channel is the medium over which the
information is carried: 200KHz and 0.577ms
0 1
TDMA FRAME
Timeslot The information carried in one timeslot is called a burst
The information carried in one timeslot is called a burst
Physical Channel and Logical Channel
The logical channel consists of the information carried
over the physical channels
TDMA FRAME
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Two types of Logical Channel
Traffic Channel (TCH) :
Transmits traffic information, include data
and speech.
Control Channel (CCH) :
Or Signaling Channel, transmits all kinds of
control information.
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Traffic Channel (TCH)
TCH
Traffic Channels
Speech
TCH/FS
Data
TCH/HSTCH/9.6 TCH/2.4
TCH/4.8
TCH Traffic ChannelTCH/FS Full rate Speech Channel
TCH/HS Half rate Speech Channel
TCH/9.6 Data Channel 9.6kb/s
TCH/4.8 Data Channel 4.8kb/s
TCH/2.4 Data Channel 2.4Kb/s
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FCCHSCH
CCH (Control Channels)
DCCH
SDCCH
BCH
BCCH Synch. CH.ACCH
SACCHFACCH CCCH
RACH CBCH
PCH/AGCH
Broadcast Control Channel BCCH
Common Control Channel CCCH
Dedicated Control Channel DCCH
Associated Control Channel ACCH
Control Channel (CCH)
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CCH
BCH
BCCHSynch.
Channels
SCH FCCH
The information carried on the BCCH
is monitored by the MS
periodically when it is in idle mode
BCCH: Broadcast Control Channel
FCCH: Frequency Correction Channel
SCH: Synchronization Channel
Broadcast Control Channel BCCH
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CCH
CCCH
RACH
uplinkCBCH
downlink
PCH/AGCH
downlink
The CCCH is responsible for
transferring control information
between all mobiles and the
network.
RACH: Random Access Channel
PCH: Paging Channel
AGCH: Access Granted Channel
CBCH: Cell Broadcast Channel
Common Control Channel CCCH
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CCH
DCCH
SDCCH
FACCH SACCH
DCCH is assigned to a single
wireless connection for
measurement and handover
purpose.
SDCCH: Stand-alone DedicatedControl Channel
ACCH:Associated Control Channel
SACCH: Slow Associated
Control Channel
FACCH: Fast Associated ControlChannel
ACCH
Dedicated Control Channel DCCH
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RACH CCCHCCH
SDCCH
SACCH
FACCH
TCH/F
TCH/H
DCCH
TCH
DCH
Uplink Logical channel
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FCCH
SCH
BCCH
PCH
AGCH
BCCH
CCCH
CCH
SDCCH
SACCH
FACCH
TCH/F
TCH/H
DCCH
TCH
DCH
Downlink Logical channel
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Allocate signaling channel
FCCH
SCH
BCCH
PCH
RACH
AGCH
SDCCH
SDCCH
TCH
FACCH
Power-off
Idle mode
Dedicated mode
Idle mode
How to use these channels?
Search for frequency correction burst
Search for synchronous burst
Extract system information
Monitor paging message
Send access burst
Set up the call
Allocate voice channel
Conversation
Release the call
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Packet data channel (PDCH)
Comprising packet service channel and packet control channel
Packet service channel (PDTCH)Combined into the single-directional service channel
Packet control channel
Broadcast control channel: PBCCHPublic control channel: PPCH, PRACH, PAGCH
Private control channel: PACCH, PTCCH
TCH
BCCH
SACCH
Packet logic channel
CCCH
TCH
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GSM Logical Channel Combination
Main BCCH combination FCCH + SCH + BCCH + CCCH
SDCCH combination SDCCH/8 + SACCH/8
Combined BCCH BCCH + CCCH +SDCCH/4 + SACCH/4
TCH/FR combination TCH/F + FACCH/F + SACCH/F
TCH/HR combination TCH/H + FACCH/H + SACCH/H
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TDMA Frames
0 1
0 1 2 43 46 47 48 5049
51 Frame Multi-frames
0 1 10
CONTROL
CHANNELS
2 3 4 5 6 7 2 3 5 764
GSM Multi-frames
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GSM Multi-frames
TDMA Frames
0 1
0 1 2 43 21 22 23 2524
26 Frame Multi-frames
0 1 10
TRAFFIC
CHANNELS
2 3 4 5 6 7 2 3 5 764
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Chapter 1 GSM System OverviewChapter 1 GSM System Overview
Chapter 2 GSM Network StructureChapter 2 GSM Network Structure
Chapter 3Chapter 3 Service Area and Number PlanningService Area and Number Planning
Chapter 4Chapter 4 Channels on the Wireless InterfaceChannels on the Wireless Interface
Chapter 5 Radio TechniquesChapter 5 Radio Techniques
Chapter 6 GPRS & EDGE IntroductionChapter 6 GPRS & EDGE Introduction
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Power Control
Saves battery power
Reduces co-channel and
adjacent channel interference
8W
0.8W
5WBoth Uplink and Downlinkpower settings can be
controlled independently
and individually.
BCCH -------
Does not attend Power control
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DTX and VAD
Voice Activity Detection VAD
Discontinuous Transmission DTX
Battery Saving
Interference reduction
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Timing Advance (TA)
Transmission delay t
Transmission delay t
TA
The mobile phone should
send the signal in advance!
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Multi-path Fading
Diversity
Frequency Hopping
Time Dispersion
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Diversity Whats Diversity?
Receive diversity provides an effective technique for both overcoming the
impact of fading across the radio channel and increasing the received signal to
interference ratio.
The former is achieved by ensuring uncorrelated (i.e. low enough correlated)
fading between antenna branches i.e. not all antennas experience fades at the
same time.
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Kinds of Diversity
Time diversity Coding, interleaving
Frequency diversity
Frequency hopping
Space diversity
Multiple antennas
Polarization diversity
Dual-polarized antennas
Multi-path diversity
Equalizer
t
f
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Frequency HoppingFrequency
f 0
Frame
f 1
f 2
f 3
f 4
Time
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57.6 kbps
115 kbps
384kbps
2Mbps
GSM
HSCSD
GPRS
EDGE
IMT-2000
9.6 kbps
2G
2.5G
3G
GSM Development Evolution
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Data rate of EDGE and GPRS
8PSKGMSK
9.0
13.415.6
21.4
8.811.2
14.817.6
22.4
29.6
44.8
54.4
59.2
0.0
10.0
20.0
30.0
40.0
50.0
60.0
CS-1 CS-2 CS-3 CS-4 MCS-1 MCS-2 MCS-3 MCS-4 MCS-5 MCS-6 MCS-7 MCS-8 MCS-9
Kbps
GPRS
EGPRS
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Downlink, 4 TS, MCS-9
Huawei EDGE Test Result
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The basic idea of GSM
The frequency spectrum used in GSM
The structure of GSM
Certain service area and numbers
Some radio techniques used in GSM
Evolution of GSM
SummarySummary
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