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The author:(作者)aaa
published in(发表于) 2014/12/14 9:14:47
You use 4G， do you know these basics？ ，

You use 4G, do you know these basics? -4G,4G network-IT information
You use 4G, do you know these basics?

Many people buy 4G Smartphone when may encounter this phrase often, five-module 13, five rows 17 frequency, dual 4G, mobile 4G, link 4G. So what exactly do these terms mean? Between them, what difference does it make?

In fact, none of these claims are actually comparing with Chinese characteristics, saying because there are three carriers in China, and China Mobile operates a TD of our patented technology network, all five modes of argument. And today we talk about 4G network system of things.

What is a five-mode?

First said five die is a chip support TD-LTE, and FDD-LTE, and TD-SCDMA, and WCDMA, and GSM five species different of communications mode, currently only Qualcomm company can production this phone chip, so currently a is sad urged of status is, domestic phone manufacturers each shipments one phone, except paid Qualcomm chip costs outside, also to by phone retail of grow at a as patent authorized costs Shang handed Qualcomm, many friends will Qualcomm dubbed for "China of chip IRD".

Second, what is a 2G/3G/4G?

In addition, GSM or mobile China Unicom and Unicom mobile 3G,WCDMA is 2G,TD-SCDMA is 3G,TDD-LTE is 4G mobile 4G,FDD-LTE is another worldwide, is the future of China Unicom and China Telecom will use the 4G network. Note FDD-LTE is the network of China Unicom and China Telecom would be used, so if you purchase a mobile phone does not support the FDD-LTE network, that may not supported 4G network of China Unicom and Telecom. Although China does not publish FDD-LTE licence, but sooner or later will be released.

Third, what is 13?

13-band is the phone supports five die in front of the subdivision, there can be understood as each mode is divided into different bands, here are 2G, 3G, 4G, supported by different bands.

1, 2G network

GSM：850/900/1800/1900

2, 3G network ()

WCDMA:2100MHz/1900MHz/850MHz (China Unicom 3G)

TD-SCDMA:1880-1920MHz/2010-2025MHz (mobile 3G)

3, 4G network

TDD-LTE:1900MHz/2300MHz/2600MHz (mobile 4G)

FDD-LTE:1800MHz/2600MHz (4G of China Unicom and China Telecom in the future)

Double 4G with five rows 13 frequency is a mean, supports five modes 13-band mobile phone, which is to support 2G, 3G,4G of network of China Mobile and China Unicom, the double 4G. So just plug mobile phone card, is supporting mobile networks of 2G, 3G, 4G, Unicom card inserted to support China Unicom network of 2G, 3G, 4G, very universal.

Four-thirteen-seventeenths, what's the difference?

Network mode frequency, refer to each network band of different countries are divided in several different bands and let them run on different frequencies and do not interfere with each other. Generally speaking, as well as radio, tune different frequencies are different. Mobile phone networks as well as different bands of the radio, operating on different frequencies.

Five-channel 13-band frequency, support TD-LTE Band38/39/40,LTE FDD Band7/3,TD-SCDMA Band34/39,WCDMA Band1/2/5,GSM Band2/3/8, the 13 frequencies.

17, five more than 13 frequency bands, namely TDD-LTE Band38/39/40/41,LTE FDD Band1/3/7,TD-SCDMA Band34/39,WCDMA Band1/2/5/8,GSM Band 2/3/5/8.

Chinese carriers are divided into different frequency bands, as many operators in many countries of the world are divided into different bands. Phone support frequency more supported network to be more mobile phone roaming, the better.

Take a simple example, such as China's 4G, run 1900MHz on this frequency in China when roaming to the United States when, you may need to run in 2200MHz frequencies, to France and you may need to run 1800MHz on this frequency.

Phone support for multiple frequency is very important. Otherwise, if China's mobile phone export to foreign markets if not supported local network model that is a big part of the problem.

Small summary:

Under normal circumstances, most of the five-mode handsets are world wide, because the five models and 13 frequency bands have to be universal, as long as your phone is five rows 13 frequency or dual 4G, basically can do worldwide.

Need to be aware of is that many profiteers often die ten five-eight frequency band or tri-mode when the pair 4G to fool the user. More about knowledge of network systems, it is helpful for when you buy a cell phone.

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