Many hot new Chinese phones are launching as TD-SCDMA models here in China, but what does that mean for you? What is TD-SCDMA, should you buy a TD-SCDMA phone, will it work on your network? Everything you need to know here!
What is TD-SCDMA
TD-SCDMA is the 3G standard developed for and used by China Mobile on the Chinese mainland. When 3G was just beginning in China, China Mobile decided to develop their own format of 3G so to avoid paying highly expensive patent fees.
TD-SCDMA launched in China on 7th July, 2009. TD-SCDMA phones come with a dual-band mode, the main band running 3G and the backup (legacy) band being GSM.
What does TD-SCDMA stand-for?
TD-SCDMA stands for ‘time division synchronous code division multiple access’
Will TD-SCDMA work in my country?
The simple answer is ‘No’. If you want to use 3G a 3G data connection and you do not live in China, then TD-SCDMA will not work. However, if you do not require 3G and only rely on 2G/GSM networks and Wi-Fi then a TD-SCDMAphone should happily work on most GSM frequencies meaning you can make calls, send SMS and browse the web at EDGE speed (slow download and surfing).
Should I buy a TD-SCDMA phone?
China Mobile are the largest phonenetwork in the world based on the number of subscribers. However, this means that even here in China their 3G network is under a lot of stress and is not as reliable than China Unicom’s WCDMA option.
The only time we would recommend buying a China Mobile TD-SCDMAphone is if you really want to have the latest handsets as they launch, as many manufacturers will launch their new device on China Mobile first.
For all other users who need 3G to work in China or Internationally, we suggest you to buy a WCDMA model which may also be known as a China Unicom version.
Do you have any questions about TD-SCDMA?
If you have any questions comments or tips regarding TD-SCMDA phones then please feel free to leave the m in the comments section below.
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Andi, have you had first-hand experience with TD-SCDMA? I know it’s slower than Unicom’s WCDMA, but how bad is it really? Some numbers on Speed Test would be nice if possible obviously 🙂
Hi, TD-SCDMA is certainly not as fast as WCMDA/HSPA+ as it is really more closer to a previous generation of 3G. Remember when 3G started and effectively 384 Kbps was a standard. Well its really based on that. Since then WCDMA speeds have gone up a lot more while TD-SCDMA has improved a bit but nowhere near HSPA+ like speeds.
Typical Unicom WCDMA speeds probably around 5-10mbps at least probably above 2mbps? Whilst CM’s TD-SCDMA when its fast probably not more than 2mbps so its 3G technically but not the fast 3.7xG that some of us have become accustomed to. Zol.com.cn have done loads of benchmark tests and confirms CM’s TD-SCDMA falls below 1mbps most of the time. This is one of the reasons why CM have lost out so much to Unicom in the 3G arena because their standard was always not as mature and never really had the speed to satisfy users, they know about it and have cut their losses and concentrated on the new TD-LTE network. So they are trying to make up with 4G. Zol.com.cn have tested their LTE speeds in Zhejiang and GuangDong province. The speeds are OK. 15-30mbps depending time and location.
Thanks for your reply 🙂 It’s always good to get some first-hand insight of TD-SCDMA, since it’s really hard to Google non-Chinese materials regarding the matter.
I always know that TD-SCDMA is not nearly as fast as Unicom’s WCDMA. But if it’s mostly around 500 kbps to 1 Mbps and reliably consisten, I think I can probably live with if I really have to (such as in emergency or something), and this is still much better than Edge. If you don’t mind (and if you have time), can you refer me to links where they’re doing extensive testing on the speeds? I don’t read Chinese characters, so it’s hard for me to navigate Zol.com.cn 🙂
On a side note, I was in Hong Kong this past summer, and their WCDMA was not as fast as the HSPA+ speed I am getting in Canada (I think it was about 2 or 3 Mbps normally, but not much more than that), maybe because it’s too crowded? So would you say that the mainland’s WCDMA coverage was as reliable and as fast roughly as in Hong Kong?
Also, TD-LTE is based on the same core technology as TD-SCDMA if I’m not mistaken, If they can really maintain 15-30 Mbps real world performance, then that speed won’t be too far off compared with the kind of speed you can get from (FDD)LTE in North America.
I heard that Japan’s Softbank’s TD-LTE connection (which is maintained by Huawei IIRC) is really fast. So unless China Mobile screw it up really bad, then coverage in China should be decent too. Obviously Japan is not China, and several large cities in China are enough to make up Japan-sized population, so it is much more challenging to provide reliable coverage in China than in Japan (or even North America).
Only in Chinese but you can make it out on page 3 of the article there is a typical test on speed test on CM’s 2g, 3g td-scdma and 4g td-lte.
As you can see its 3g is around 1.2 Mbps which is quite typical when there is a mobile data signal.
I agree that in hong Kong the 3g signal is not as hot as they advertise. 3 Mbps is quite typical from my experience. I have occasionally seen around 10mbps with wcdma. Lte around 10-20mbps, generally I find it is also a more stable signal over a longer range. They probably overloaded their 3g networks now doing little maintenance because they just want to push you to 4g.
Even though the test speeds showing in hong Kong and mainland aren’t miles apart you will still notice access in hong Kong feels a lot faster when you know you are going out fetching data from north america and europe. Mainland has less bandwidth going out shared by a much larger population plus firewall controls etc.
Thanks a lot for the link, that sure gives a lot of insight to us in the West about the mysterious TD-SCDMA (though I needed Google to translate the site).
It looks like that, when it’s good signal, TD-SCDMA does not seem too bad then, especially when compared with EDGE, it’s just that, with its 750 million customers (twice the size of United States), the network gets clogged from time to time, so it’s kind of understandable. At least we know China Unicom seems to provide good data connections for 3G (though their user base is much smaller than China Mobile).
And I’m glad to see that TD-LTE is performing well during trial runs. At least in principle, unlike TD-SCDMA, TD-LTE has similar theoretical performance as FDD-LTE, and in Japan (with SoftBank), TD-LTE is performing really well. Japan, obviously, is much smaller than China in population and areas, but it is still encouraging to hear such news 🙂
When I was last in China I tried using both a TD-SCDMA phone and WCDMA, the TD-SCDMA phone tended to drop data connections much more frequently, especially if you are in a moving vehicle.
TD-LTE is a totally different standard, don’t let the talk about it being an evolution of TD-SCDMA scare you off, that’s just a face saving ploy so people don’t realize the entire development of TD-SCDMA was a dead end boondoggle.
If I were you I’d look into getting a dual mode phone that supports both LTE standards as well as WCDMA. Skip TD-SCDMA unless you enjoy torturing yourself or want to become suicidal (surfing the net using TD-SCDMA on a train in China is enough to make you want to murder someone).
mobile.zol.com.cn/405/4053123.html
Only in Chinese but you can make it out on page 3 of the article there is a typical test on speed test on CM’s 2g, 3g td-scdma and 4g td-lte.
As you can see its 3g is around 1.2 Mbps which is quite typical when there is a mobile data signal.
I agree that in hong Kong the 3g signal is not as hot as they advertise. 3 Mbps is quite typical from my experience. I have occasionally seen around 10mbps with wcdma. Lte around 10-20mbps, generally I find it is also a more stable signal over a longer range. They probably overloaded their 3g networks now doing little maintenance because they just want to push you to 4g.
Even though the test speeds showing in hong Kong and mainland aren’t miles apart you will still notice access in hong Kong feels a lot faster when you know you are going out fetching data from north america and europe. Mainland has less bandwidth going out shared by a much larger population plus firewall controls etc.
Tried posting a link but gizchina won’t pass moderator and reply never shown.
It was only in Chinese. You can go on zol.com.cn and simply do a search with English term 3g vs 4g in the search box and many articles of benmark tests will be shown.
There is a typical test on speed test on CM’s 2g, 3g td-scdma and 4g td-lte.
You will see its 3g is around 1.2 Mbps which is quite typical when there is a mobile data signal.
I agree that in hong Kong the 3g signal is not as hot as they advertise. 3 Mbps is quite typical from my experience. I have occasionally seen around 10mbps with wcdma. Lte around 10-20mbps, generally I find it is also a more stable signal over a longer range. They probably overloaded their 3g networks now doing little maintenance because they just want to push you to 4g.
Even though the test speeds showing in hong Kong and mainland aren’t miles apart you will still notice access in hong Kong feels a lot faster when you know you are going out fetching data from north america and europe. Mainland has less bandwidth going out shared by a much larger population plus firewall controls etc.
I am about to receive an N1 which is TD only. I’ll borrow a TD card and give it a go 🙂
Thanks, Andi 🙂 I don’t understand why you would need to order the TD version of N1 though. Wasn’t the N1 already made available for the US and Europe? Why couldn’t you just get the WCDMA version?
In China we still don’t have the WCDMA model and I couldn’t wait any longer : D
Xiaomi is probably regretting their decision of delaying the S800 model now. That thing is far overdue.