EDGE

Topics: General Packet Radio Service, Enhanced Data Rates for GSM Evolution, Trigraph Pages: 26 (874 words) Published: January 9, 2014
SATNAC 2003

10 September 2003

EDGE: The Introduction of High Speed Data
in GSM / GPRS Networks
Wendy Florence
Ericsson South Africa

Rev A

10 September 2003

1

SATNAC 2003

Agenda





What is EDGE?
Implementing EDGE
Network and transmission planning
The live experience …

Rev A

Rev A

10 September 2003

2

SATNAC 2003

1

SATNAC 2003

10 September 2003

Agenda





What is EDGE?
Implementing EDGE
Network and transmission planning
The live experience …

Rev A

10 September 2003

3

SATNAC 2003

The Abbreviation
GPRS = General Packet Radio System

EGPRS = GPRS + EDGE modulation

EDGE = Enhanced Data rates for Global Evolution
Rev A

Rev A

10 September 2003

4

SATNAC 2003

2

SATNAC 2003

10 September 2003

GPRS / EGPRS Protocol
Internet
GPRS

GPRS Protocol

MS

SGSN GGSN
GGSN

EDGE
BTS
TRU

EDGE

PCU

EDGE Protocol

MS

Rev A

10 September 2003

No changes

SATNAC 2003

5

EDGE introduces a new modulation scheme …
Currently:
GMSK Modulation

EDGE:
8PSK Modulation

Q

(0,1,0)
(0,0,0)

“1”

Q
(0,1,1)

I

I
(0,0,1)

“0”

(1,1,1)

(1,0,1)

(1,1,0)
(1,0,0)

“1 bit per symbol”
Rev A

Rev A

10 September 2003

“3 bits per symbol”
6

SATNAC 2003

3

SATNAC 2003

10 September 2003

GPRS and EDGE: Basic Technical Parameters
GSM

EDGE

Modulation

GMSK

8-PSK / GMSK

Symbol rate

270 ksym/s

270 ksym/s

Modulation bit rate

270 kb/s

810 kb/s

Radio data rate per time slot

22.8 kb/s

69.2 kb/s

User data rate per time slot

20 kb/s (CS4)

59.2 kb/s (MCS9)

User data rate (8 time slots)

160kb/s

473.6kb/s

(182.4kb/s)

(553.6kb/s)

Rev A

10 September 2003

SATNAC 2003

7

EGPRS Coding Schemes

kbps

59.2

60
54.4

50
40
44.8

30

29.6
22.4

20.0

20
14.4

17.6
14.8

12.0
8.0

GPRS

Rev A

MCS9

MCS8

MCS7

MCS6

MCS5

EGPRS

GMSK modulation
Rev A

MCS4

MCS3

CS4

CS3

CS2

CS1

MCS2

8.4

0

MCS1

10

11.2

10 September 2003

8PSK modulation
8

SATNAC 2003

4

SATNAC 2003

10 September 2003

C/I distribution for 4/12 frequency
re-use with different loads

EDGE versus GPRS link level performance
100

50

C.D.F. [%]

Throughput per TS [ kbps]

60

40
30

80
60
40

20
20
10
0

0
0

5

10 15 20 25 30 35 40
C/I [dB]
90% of the users

0

10

20 30 40 50 60
C/I [dB]
90% of the area

Assume even traffic distribution in cell
Rev A
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