文档介绍：EGPRS
- a technical view -
The Abbreviation
GPRS = General Packet Radio System
EDGE = Enhanced Data rates for Global Evolution
EGPRS = GPRS + EDGE modulation
Network modification !
BTS
PCU
SGSN
GGSN
MS
GPRS
GPRS Protocol
EDGE TRU
MS
EDGE
EDGE Protocol
No changes
~ kbytes
1500 bytes
20-50 bytes
4 114 bits
(E)GPRS Overview
- Packet Data -
By EGPRS affected layer
RLC
8PSK
I
Q
(0,1,1)
(1,1,0)
(1,0,1)
(0,0,0)
(0,0,1)
(1,1,1)
(1,0,0)
(0,1,0)
I
Q
“1”
“0”
EDGE introduces new Modulation
Currently: GMSK Modulation
EDGE: 8PSK Modulation
“1 bit per symbol”
“3 bits per symbol”
(E)GPRS 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 kb/s kb/s
User data rate per time slot 20kb/s (CS4) 59,2 kb/s (MCS9)
User data rate (8 time slots) 160kb/s 473,6kb/s
() ()
10
20
30
40
50
60
0
MCS1
MCS2
MCS3
MCS4
MCS5
MCS6
MCS7
MCS8
MCS9
CS1
CS2
CS3
CS4
GMSK modulation
8PSK modulation
kbps
GPRS
EGPRS
Standardized improvement I EGPRS Coding Schemes
GPRS/EDGE Overview
Ericsson Implementation
BSS
R10
SGSN
HLR
R9
RBS 2206 EDGE dTRU
MSC
R9
RBS2202 (现网)
+ sTRU / DXU-21
EDGE
终端
GGSN
CGSN
软件升级
硬件更换或更新
EDGE 商用: 网络要求
OSS
RBS2308
Capacity
Channel Number
Mean PDCH = # TCH - mean speech traffic (served)
10
20
Time
Channels used by Circuit Switched Traffic
Available Channels for GPRS