Edge technology

1. 08/10/11 KARTHIK 1
Welcome
By
Karthik

2. 08/10/11 KARTHIK 2
EDGE TECHNOLOGY
AN EVOLUTION IN
MOBILE
TECHNOLOGY

3. 08/10/11 KARTHIK 3
History
•In 1
st
G AMPS(Advanced Mobile system)
developed in U.S in 1983
•In 2
nd
G there was introduction of
CDMA,TDMA and GSM
•Between 2
nd
and 2.5
th
G of GPRS
• Between 2.5
th
and 3
rd
G there was an
introduction EDGE TECHNOLOGY

4. 08/10/11 KARTHIK 4
Then Came Digital………..Then Came Digital………..
AMPS
CDPD
1G 2G
CDMA
TDMA
GSM
IDEN
2.5G
GPRS
1XRTT
3G
1X-EVDO
EDGE
WAN LAN
802.11

5. 08/10/11 KARTHIK 5
Introduction
•Enhanced data for global evolution(EDGE)
is a high speed mobile data
standard,intended to enable second
generation global system for mobile
communication (GSM) and time division
multiple access(TDMA).
•Transmits data at up to 384 kilobits per
second(Kbps)

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Topics of Discussion
• Mobile evolution
•Edge technology
•GPRS
•EDGE system performance
•Channel coding and frame structure
•Applications
•Conclusion

7. 08/10/11 KARTHIK 7
Mobile evolution
•1
st
generation mobile communication
•2
nd
generation mobile communication
•2.5
th
generation mobile communication
•3
rd
generation mobile communication
•3G and above

8. 08/10/11 KARTHIK 8
EDGE Technology
•Evolutionary path to 3G services for GSM and
TDMA operators
•Builds on General Packet Radio Service
(GPRS) air interface and networks
•Phase 1 (Release’99 & 2002 deployment)
supports best effort packet data at speeds up to
about 384 kbps
•Phase 2 (Release’2000 & 2003 deployment) will
add Voice over IP capability

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Enhanced Data rates for GSM Evolution
•Can increase the capacity and data
throughput typically to 3-4-fold over GPRS
•Theoretical maximum speeds of up to 473
kilobits per second (kbps)
•Average recognizable data rates between 80
and 130 kbps
•TDMA carriers must still convert to GSM,
then add GPRS before deploying EDGE
technology
EDGEEDGE

10. 08/10/11 KARTHIK 10
2.5G (Between 2G and 3G)
•Uses General Packet Radio Services
(GPRS) technology.
•GSM and TDMA were enhanced to packet
based networks
•GPRS is primarily a simple software
upgrade on GSM and TDMA
•Easy for the service providers to update
their networks

11. 08/10/11 KARTHIK 11
GPRS
•Packet based networked over existing
circuit switched GSM network.
•GPRS radio resources are used only when
users are actually sending or receiving data.
•Rather than dedicating a radio channel to a
mobile data user for a fixed period of time,
the available radio resource can be
concurrently shared between several users.
•Brings desktop experience to wireless such
as web browsing and chat.
•Enables file transfer and home automation.

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2.5G characteristics
•Data rates 64 – 144 Kbps.
•A leap from 9.6kbps of 2G to 64Kbps
•Packet based networks.
•Always-on connectivity.
•Instant messaging + small attachments.
•New wireless standards started emerging.

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GPRS shortcomings
•GPRS packets are sent in all different
directions to reach the same destination
•Potential for packet getting lost or corrupted
during the data transmission over the radio
link.
•Though it incorporates data integrity and
retransmission strategies, potential transit
delays can occur.

14. 08/10/11 KARTHIK 14
EDGE Technology
•EDGE – Enhanced Data GSM
Environment.
•Developed to increase the bandwidth of
GPRS technology.
•EDGE increased the bandwidth of GSM
from 144 Kbps to 384 Kbps.
•Migration towards 3G technology started.

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Courtesy: http://www.gsmworld.com/technology/index.shtml

16. 08/10/11 KARTHIK 16
EDGE System Performance
0
10
20
30
40
50
60
70
80
90
100
010203040506070
Probability throughput < = X per timeslot
X (kb/s)
26 users/sector at 3.84 kbps average load per user
0
10
20
30
40
50
60
70
80
90
100
010002000300040005000
Probability packet delay < = X
X (msec)
%
%

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EDGE modulations

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EDGE Channel Coding and Frame Structure
464 bits
1 data block
Convolution
Coding
Rate = 1/3
Length = 7
Puncture Interleave
Burst N
Burst N+1
Burst N+2
Burst N+3
Burst
Format
8PSK
Modulate
1392 bits 1392 bits
348 bits/
burst
348 bits468.75 bits
156.25
symbols/slot
01234567
8 Time Slots
1 Time Slot = 576.92 µs
Tail
symbols
3
Data
symbols
58
Tail
symbols
3
Data
symbols
58
Training
symbols
26
Guard
symbols
8.25
Modulation: 8PSK, 3 bits/symbol
Symbol rate: 270.833 ksps
Payload/burst: 348 bits
Gross bit rate/time slot: 69.6 kbps - overhead = 59.2 kbps user data
20 msec frame with 4 time-slots for each of 8 bearers

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Some of the generation mobile
phones
•2
nd
generation phones

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Personal Digital Assistants & 2.5 G phones
Wireless via
Bluetooth
Internet
Wireless via
GPRS

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Combined PDAs and 2.5 G phones

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3G phones

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Applications

•EDGE enables operators to introduce 3G data
applications into existing GSM existing GSM
networks and thereby increase the speed of packet
oriented transmission three-fold.
· Mobile Internet access
· Mobile Office
· Field sales/service
· Wireless access to databases

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Application cont
· Electronic commerce:
Point of sale
Electronic banking
Electronic cash
Electronic payment
· Messaging
· Fleet management
· Road guide systems
· Security/supervisory systems
•

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Application cont
• Reservation system (e.g. hotel, theater,
flights)
•Highway charging systems
•Location based info service
•Video telephony
•Telescoping

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Conclusion
•EDGE paves the way into mobile
multimedia applications whilst offering the
maximum of investment protection:
· No need for new network elements
•Low risk of investment thanks to the dual
mode of GSM/EDGE (Slot by slot)

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Conclusion cont
•1. Smooth evolution path
•2. Supporting same type of services as GPRS
but with higher data rates of more than 400 kbit/s
•3. Use of GSM spectrum, bandwidth, protocol,
carrier structure and cell planning process
• i. Additional step towards UMTS –enables
smooth network evolution
• ii. New business opportunities in a market
with tremendous growth potential
• iii. Better ratio of cost to bandwidth

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THANK YOU
THANK YOU FOR YOUR
PRECIOUS TIME