LTE（Long TermEvolution）
student:
49912119 Yi-Yun Shie
49912088 Bing-Han Shen
Teacher:
Ru-Li Lin
Southern Taiwan University of science and Technology
Directory
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Mobile Evolution
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2G
3G
LTE
Wi-Fi
Wimax
Motivation to promote LTE
Contrast
Outlook
Reference
Mobile Evolution
2G
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The second generation (Second Generation)
mobile communications technology
specifications referred to, with respect to
the previous generation directly to an analog
signal for voice transmission mode, 2G
mobile voice communications systems based
on digitally transmitted .
3G
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3G is the "third generation mobile
communication technology" abbreviation
is IMT-2000 refers to support high-speed
data transmission cellular mobile
communications technology.
LTE
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The main requirements for the new access
network are high spectral efficiency, high
peak data rates, short round trip time as well
as flexibility in frequency and bandwidth.
Wi-Fi
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Wi-Fi setup requires at least one Access
Point (ap) and one or more client (hi). AP
every 100ms the SSID (Service Set
Identifier) via beacons (signal station)
broadcast packets once beacons packet
transmission rate is 1 Mbit / s, and the length
is quite short, so little impact on the
performance of the network broadcast the
action. Because Wi-Fi specified minimum
transfer rate is 1 Mbit / s, so make sure all
the Wi-Fi client end can receive the SSID
broadcast packet,
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client can decide whether you want to take
this one SSID and the AP connection. Users
can set where you want to connect an SSID.
Wi-Fi system is always connected to the
client open standards and supports roaming,
which is Wi-Fi benefits. It also means that
there is a wireless adapter card may be
better than others in performance. Since WiFi signals transmitted through the air, and
therefore non-switched Ethernet have the
same characteristics. The past two years, the
emergence of a new program of WIFI over
cable. This program belongs to EOC
(ethernet over cable) in one technology.
Down through the 2.4G wifi radio frequency
transmission cable in the rear.
Wimax
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Worldwide Interoperability for Microwave
Access – should be capable of around 40
megabits per second with a range of 30
miles. It is one of the closest technologies
to meet the standards of true 4G and as it
develop should surpass the 100MB/second
which is the 4G standard. Mobile WiMAX
allows the use of high speed data transfers
and is the main competition for the 4G LTE
services provided by cellular carriers.
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The major wireless networks like Verizon,
Sprint, AT&T and T-Mobile are not actually
lying to anyone about 4G, they simply
stretch the truth a bit. A 4G phone has to
comply with the standards but finding the
network resources to fulfill the true
standard is difficult. You are buying 4G
capable devices but the network is not yet
capable of delivering true 4G to the
device. Your brain knows that 4G is faster
than 3G so you pay the price for the extra
speed.
Motivation to promote LTE
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Need to ensure the continuity of
competitiveness of the 3G system for the
future
User demand for higher data rates and
quality of service
Packet Switch optimised system
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Continued demand for cost reduction
(CAPEX and OPEX)
Low complexity
Avoid unnecessary fragmentation of
technologies for paired and unpaired band
operation
Contrast
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Downlink peak data rates up to 326 Mbps
with 20 MHz bandwidth
Uplink peak data rates up to 86.4 Mbps with
20 MHz bandwidth
Operation in both TDD and FDD modes
Scalable bandwidth up to 20 MHz, covering
1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz,
and 20 MHz in the study phase
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Increased spectral efficiency over Release 6
HSPA by two to four times
Reduced latency, up to 10 milliseconds (ms)
round-trip times between user equipment
and the base station, and to less than 100 ms
transition times from inactive to active
Countries use LTE services
LTE networks are being deployed in the country
Commitment and the country has built test
network
Outlook
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http://youtu.be/nSsh7mgAlv0
Reference
http://www.3gpp.org/technologies/keywor
ds-acronyms/98-lte
 http://www.4gamericas.org/index.cfm?fuse
action=page&sectionid=249
 http://www.samsung.com/tw/support/4glte/
 http://youtu.be/nSsh7mgAlv0
 http://pcdaily.blogspot.tw/2012/01/news4g2012.html
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http://download.ithome.com.tw/article/index/id/
1250
 http://www.whatsag.com/
 http://blog.xuite.net/chenfy/happydad/16028294%E7%84%A1%E7%B7%9A%E9%80%9A%E8%A8
%8A%E6%8A%80%E8%A1%93%E5%82%B3%E8
%BC%B8%E9%80%9F%E5%BA%A6%E4%B8%80
%E8%A6%BD%E8%A1%A8
 http://zh.wikipedia.org/wiki/WiFi#.E7.94.B1.E4.BE.86
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Thank you for your listening