can anyone explain to me what TD-LTE is?

pla101prc

Senior Member
apparently has something to do with cellphone and all that good stuff. says China is gonna build a network...however i have no idea what the hell this is and how its supposed to make money and how does it compare to other existing systems around the world.
 

bd popeye

The Last Jedi
VIP Professional
apparently has something to do with cellphone and all that good stuff. says China is gonna build a network...however i have no idea what the hell this is and how its supposed to make money and how does it compare to other existing systems around the world.

I have no clue so I used google
biggrin.gif
. google is your friend doncha know!
Please, Log in or Register to view URLs content!


LTE TDD (Long Term Evolution Time Division Duplex) or also known as TD-LTE is part of the 3GPP specifications for the next generation cellular technology. In China, TD-LTE will be an evolution from TD-SCDMA and will provide for asymmetric needs of mobile data usage and allow use of unpaired spectrum.
Agilent provides powerful and scalable design and test platforms that support the TD-LTE Radio Access Network (RAN) eNode B stations, and User Equipment (UE) development lifecycle. So, as you take TD-LTE forward, Agilent clears the way.

Try these links. I hope you understand tech talk..I sure don't.:eek:

Please, Log in or Register to view URLs content!


Please, Log in or Register to view URLs content!


Please, Log in or Register to view URLs content!


And lastly here's a link to a video on the subject.

Please, Log in or Register to view URLs content!
 

crobato

Colonel
VIP Professional
TDD - Time Division Duplex
FDD - Frequency Divide Duplex

In FDD, data upload and download are placed on two separate channels. This allows uploads and downloads to occur simultaneously and in parallel. Good, except it requires two frequencies. In TD, both upload and download is shared into a single frequency and access to that frequency is dynamically determined.

As more and more smartphones, MIDs (Mobile Internet Devices) and dongles come online, the FCC and other FCCs around the problem are facing with a growing problem sometimes called "spectrum Armageddon." In other words, there won't be enough spectrum band to accommodate the sheer number of projected wireless internet devices that may come online. This is not just smartphones and dongles, but also a category called MIDs or tablets, like the iPad where you got tablet sized computers that have built in 3G/4G telephony with internet.

So far, all our 3G technologies have been FDD. This includes W-CDMA also known as UMTS, and its 3.5G derivatives, HSPA, HSPA+ and HSDPA. This 3G is the successor of the GSM standard. There is also the CDMA-2000 also known as EV-DO, which is the 3G successor to CDMA, used by Verizon, Sprint, Bell (Canada), KDDI (Japan) and China Telecom.

China is the only country to have a TDD 3G standard, called TD-SCDMA. This is used only with China Mobile, and handsets made to this standard is not 3G compatible with the rest of the world. Why would China opt for this home grown standard? TDD as you can see relies on a single channel for data uploads and downloads. Already that puts you with half the frequency use of FDD, a big advantage in heavy population density areas.

Why is TDD more efficient in terms of internet access on high density areas? FDD makes the assumption that uploads and downloads of data is about equal. This makes sense if the user does a lot of talking. But as mobiles turn increasingly to use internet data, such as streaming music, TV and videos, usage becomes asymmetrical in heavy favor of the download. In typical internet usage, on PCs, download of data predominates over upload. Under an FDD scheme you are wasting a frequency band waiting for an upload. TDD removes under utilization and saves you one frequency channel. Use the main channel for downloads and upload when necessary.

Of course, using a dynamic time allocation means TDD is going to be more complex, which is why TD-SCDMA is so late. But as the technology keeps getting perfected, China Mobile is looking for its 4G next step--- which is TD-LTE. This turns TD-SCDMA base stations into 4G.

What got the rest of the world interested with TD-LTE is the solution to spectrum density using TDD. The main rival to LTE is WiMax which also uses a TDD solution, but carriers and much of the wireless telecom network builders like Ericsson and Nokia Siemens have already appointed LTE as the 4G standard.

While its far too late for the rest of the world to adopt TD-SCDMA, we are just beginning with 4G and TD-LTE has a good chance here.

Please, Log in or Register to view URLs content!
 

pla101prc

Senior Member
TDD - Time Division Duplex
FDD - Frequency Divide Duplex

In FDD, data upload and download are placed on two separate channels. This allows uploads and downloads to occur simultaneously and in parallel. Good, except it requires two frequencies. In TD, both upload and download is shared into a single frequency and access to that frequency is dynamically determined.

As more and more smartphones, MIDs (Mobile Internet Devices) and dongles come online, the FCC and other FCCs around the problem are facing with a growing problem sometimes called "spectrum Armageddon." In other words, there won't be enough spectrum band to accommodate the sheer number of projected wireless internet devices that may come online. This is not just smartphones and dongles, but also a category called MIDs or tablets, like the iPad where you got tablet sized computers that have built in 3G/4G telephony with internet.

So far, all our 3G technologies have been FDD. This includes W-CDMA also known as UMTS, and its 3.5G derivatives, HSPA, HSPA+ and HSDPA. This 3G is the successor of the GSM standard. There is also the CDMA-2000 also known as EV-DO, which is the 3G successor to CDMA, used by Verizon, Sprint, Bell (Canada), KDDI (Japan) and China Telecom.

China is the only country to have a TDD 3G standard, called TD-SCDMA. This is used only with China Mobile, and handsets made to this standard is not 3G compatible with the rest of the world. Why would China opt for this home grown standard? TDD as you can see relies on a single channel for data uploads and downloads. Already that puts you with half the frequency use of FDD, a big advantage in heavy population density areas.

Why is TDD more efficient in terms of internet access on high density areas? FDD makes the assumption that uploads and downloads of data is about equal. This makes sense if the user does a lot of talking. But as mobiles turn increasingly to use internet data, such as streaming music, TV and videos, usage becomes asymmetrical in heavy favor of the download. In typical internet usage, on PCs, download of data predominates over upload. Under an FDD scheme you are wasting a frequency band waiting for an upload. TDD removes under utilization and saves you one frequency channel. Use the main channel for downloads and upload when necessary.

Of course, using a dynamic time allocation means TDD is going to be more complex, which is why TD-SCDMA is so late. But as the technology keeps getting perfected, China Mobile is looking for its 4G next step--- which is TD-LTE. This turns TD-SCDMA base stations into 4G.

What got the rest of the world interested with TD-LTE is the solution to spectrum density using TDD. The main rival to LTE is WiMax which also uses a TDD solution, but carriers and much of the wireless telecom network builders like Ericsson and Nokia Siemens have already appointed LTE as the 4G standard.

While its far too late for the rest of the world to adopt TD-SCDMA, we are just beginning with 4G and TD-LTE has a good chance here.

Please, Log in or Register to view URLs content!

thnx, so where does China stand in terms of R&D of this stuff in relation to the rest of the world?
 

crobato

Colonel
VIP Professional
TD-LTE is a Chinese creation. No matter what, they will put their country into TD-LTE. Anyone who wants a piece of the Chinese market has to make TD-LTE wireless equipment and handsets. That's why everyone, Motorola, Ericsson, Nokia-Siemens, Alcatel-Lucent, Samsung, Qualcomm, Marvell, etc,. are all looking into TD-LTE, and of course, their Chinese counterparts, Huawei and ZTE.

Since you want to gravitate into a single standard, this can affect the 4G requirements on other countries. And yes, there are TD-LTE demos in Korea, Japan and Taiwan.

As far as 4G technologies goes, Huawei and ZTE are both in the forefront and that includes patent portfolios. Both companies are actually agnostic when it comes to what standard people will use, since they can put in WiMax, FDD-LTE, TD-LTE, as well as any 3G and 3.5G standard like HSPA+. For example, in the US, the WiMax base stations being operated by Sprint's Clearwire are Huawei's.
 

pla101prc

Senior Member
TD-LTE is a Chinese creation. No matter what, they will put their country into TD-LTE. Anyone who wants a piece of the Chinese market has to make TD-LTE wireless equipment and handsets. That's why everyone, Motorola, Ericsson, Nokia-Siemens, Alcatel-Lucent, Samsung, Qualcomm, Marvell, etc,. are all looking into TD-LTE, and of course, their Chinese counterparts, Huawei and ZTE.

Since you want to gravitate into a single standard, this can affect the 4G requirements on other countries. And yes, there are TD-LTE demos in Korea, Japan and Taiwan.

As far as 4G technologies goes, Huawei and ZTE are both in the forefront and that includes patent portfolios. Both companies are actually agnostic when it comes to what standard people will use, since they can put in WiMax, FDD-LTE, TD-LTE, as well as any 3G and 3.5G standard like HSPA+. For example, in the US, the WiMax base stations being operated by Sprint's Clearwire are Huawei's.

so in plain english...how does it bring revolutionary changes to communication and the information age?
 

crobato

Colonel
VIP Professional
Think of something much faster than your DSL. Without the cables. On air. Being sent to your smartphone.
 

Emilio Schluter

Just Hatched
Registered Member
so in plain english...how does it bring revolutionary changes to communication and the information age?
Since you want to gravitate into a single standard, this can affect the 4G requirements on other countries. And yes, there are TD-LTE demos in Korea, Japan and Taiwan.
 

Red___Sword

Junior Member
Since you want to gravitate into a single standard, this can affect the 4G requirements on other countries. And yes, there are TD-LTE demos in Korea, Japan and Taiwan.

What the heck? just copy others' post?

In simple words, STANDARDS, is the ultimate award of the market. You get hold a piece of the standard, the only natural thing next is earning money.

China Mobile, by using the huge existing cell phone users it operates as its bargaing chips, DEMANDS the rest of world to fall in line with this tech standard it developed, or forget about getting into China's 4G market.

Knowing that, (hopefully) all the rest of the world's other powerhouses would adapt itself to suit these shose China Mobile pre-made, and thus the defacto ALLIANCE OF 4G STANDARD has been formed, while China Mobile would be holding the biggest chunk of cake.

Anyone interesting, can further look about the BATTLE FOR HD DVD STANDARD, while blu-ray win the battle at the end of day. China, being the best student of all times, learns from this, fast.


Edit:

To those narrow thinkings which keeps asks "what is the distinctive tech advantage?" -

What is the distinctive tech advantage PS3 over XBOX360? - Not that much. They only having a distinctive differences of platform standards. Lastman standing - winner takes all game.

Standard matters, not tech.
 
Last edited:
Top