Final Report
Chapter 4 Trend on Communication Technology
Transmission speed for up-link: more than 100Mb/s;
Occupied bandwidth: 1.4MHz to 20MHz for more than 50Mb/s up-link (available TDD or
FDD)
Comparison for the above technologies is given in Table 4.2-1 below.
Table 4.2-1 Comparison of Wireless Technologies
Item
FWA
WiMAX
LTE
Legacy
IEEE802.1Q
IEEE802.16a
GPRS/EDGE/UMTS
Primary
Application
Broadband Wireless
Access
(Fixed)
Broadband
Wireless
Access
(Fixed)
Broadband
Wireless
Access (Mobile)
Frequency
Band
24 to 27 GHz
2G to 11GHz
700M to 2.6GHz
Bandwidth
20 MHz
Scalable 1.25M to
20MHz
DL:
OFDMA
UL: OFDMA
TDD and FDD
BPSK,
QPSK,
16QAM, 64QMA
Scalable 1.25M to
20MHz
DL: OFDMA
UL:
SC-FDMA
TDD and FDD
BPSK,
QPSK,
16QAM, 64QMA
DL: 75Mb/s
UL: 25Mb/s
DL: 100 to 326.4Mb/s
UL: 50 to 86.4Mb/s
11, 54, 150, Mb/s
5 km
5 km
MIMO
Access
Technology
Access Mode
Modulation
TDD/DTMA
TDD / TDMA
QPSK / 16 QAM
Peak Data Rate
Point to multi-point:
6Mb/s
Point
to
point:
64Mb/s
Cell Radius
Max. 10km
20 km for 3.5 or
7MHz BW, 8km
for 5 or 10MHz
BW
Antenna
Scheme
Omni / Sectoral /
Flat Gain Antenna
MIMO
Cell Capacity
Up to 239 Users
100 to 200 Users
4.2.2
WiFi
IEEE802.11a/11g/
n
Wireless LAN
2.4 GHz, 5 GHz
20 MHz/40 MHz
DSSS and OFDM
TDD / SDMA
BPSK,
QPSK,
16QAM, 64QAM
SISO,
MISO,
MIMO
200 Users 5 MHz BW Usually 10 to 20
400 Users 10 MHz
Clients
Prepared by Survey Team
Subscriber Network by Metallic Cables
(1) ADSL
(Asymmetric Digital Subscriber Line)
ADSL is the most commonly used technology. Its service area is a few kilometers from the
exchange office. At the exchange office, a digital subscriber line access multiplexer (DSLAM)
terminates the ADSL circuits and aggregates them, where they are handed off onto IP networking
transports. Data speed between down link and up link is asymmetric. ADSL2 and ADSL2+ are
improved versions that can provide higher speeds than ADSL.
4-3