Hi , my phone has WCDMA along with GSM (XPERIA X1) but can't read a regular CDMA simcard !
I asked the network service but didn't get much help .
So is WCDMA really CDMA ? or is it a name for UMTS ?
Hass_x1 said:
Hi , my phone has WCDMA along with GSM (XPERIA X1) but can't read a regular CDMA simcard !
I asked the network service but didn't get much help .
So is WCDMA really CDMA ? or is it a name for UMTS ?
Click to expand...
Click to collapse
WCDMA is an alias for UMTS.
Swyped from my HTC Desire running LeeDrOiD 2.3d with Tapatalk.
BodenM said:
WCDMA is an alias for UMTS.
Swyped from my HTC Desire running LeeDrOiD 2.3d with Tapatalk.
Click to expand...
Click to collapse
But whatever you call it, it still uses the technology named "Code division multiple access", right ?
And a device supporting what is called WCDMA/UMTS only (and NOT what is called CDMA), will not speak to CDMA only cell sites.
Get's confusing when names are used in different contexts.
WCDMA is just a technology used in many networks, but it is used synonymously for the UMTS family (3GPP) as it is one of the core technologies in that 3g network technology.
CDMA is also just a technology used in even more networks, but may be falsely used synonymously for CDMA2000 (3GPP2) which is the technical name for the 3g networks used in the US for example.
Here are some Wikipedia Articles that should shed some light into the whole terms:
3GPP: http://en.wikipedia.org/wiki/3GPP (That are the people behind UMTS)
3GPP2: http://en.wikipedia.org/wiki/3rd_Generation_Partnership_Project_2 (That are the people behind the concurrinng technology used in the U.S.)
CDMA: http://en.wikipedia.org/wiki/Code_division_multiple_access (A networking technology not only used in mobile systems, but also in GPS for example)
W-CDMA: http://en.wikipedia.org/wiki/W-CDMA_(UMTS) (1.: Air interface most commonly used in UMTS Networks based on CDMA 2.: WRONGLY used synonymously for UMTS)
CDMA2000: http://en.wikipedia.org/wiki/CDMA2000 (Has two meanings: 1.: Air interface "CDMA2000 1X" that is the concurring technology to wcdma but serves the same purpose 2.: Family Name of Network Protocols also known as US-3G ### Here the synonymous usage for Air interface and Protocol family is ok as they are really named the same ###)
UMTS: http://en.wikipedia.org/wiki/Universal_Mobile_Telecommunications_System (Family Name of Network Protocols that uses WCDMA as an Air Interface and is commonly found as the 3G Network in Europe and Asia)
The post-3g mobile networks will use a single technology as the 3GPP2 companies stopped development of their own 4G standard in favor of LTE (a post-3g and not really 4g standard) and LTE Advanced (which will fully comply with the 4G definition).
Where LTE (Advanced) is based on the UMTS technology by the 3GPP People.
LTE: http://en.wikipedia.org/wiki/3GPP_Long_Term_Evolution (Post-3g / Pre-4g network based on UMTS)
LTE Advanced: http://en.wikipedia.org/wiki/LTE_Advanced (The "real" 4G network)
4G: http://en.wikipedia.org/wiki/4G (4th generation wireless cellular standard that is currently in the make)
CDMA is just a theoretical type of air interface... how the physical layer and data link layer work. I wouldn't expect all CDMA to be created equal. Not sure how Verizon got to the point where it became synonymous with CDMA, because lots of carriers use the technology. Each implementation varies quite a bit in terms of spectrum allocation, time division and things like that.
Related
Can the bandswitch.exe app be used to enable this radio interface?
thanks,
[email protected]
I believe that xda2 is triband so can do 900/1800/1900.
If it can do 1900, is this accessible using the bandswitch.exe ?
Also is it the same 1900 used in the states (usa) ?
[So if someone was travelling EU to USA, one could call up this
opened up tab section on the pda and then select something
compatible with either system....EU=gsm and USA=cdma. ??
XDA II is tri-band GSM, w/c you can use anywhere in the world who has GSM coverage. CDMA is a different kind of network. I believed that is US/North America the provider using it are Sprint and Verizon, if I am not mistaken. GSM network are used by T-mobile, Cingular and now AT&T is converting also from TDMA to GSM.
And the answer is NO, you cannot use XDA II to a CDMA network. You have to change hardware parts of it. BUT yes you can used it to 1900 network in the US w/c is GSM.
GSM-Global System for Mobile
CDMA-Code Division Multiple Access
TDMA-Time Division Multiple Access
Hope this help!
superperry said:
XDA II is tri-band GSM, w/c you can use anywhere in the world who has GSM coverage. CDMA is a different kind of network.
Click to expand...
Click to collapse
Right. Within a few years however there will be phones where the entire radio transceiver is handled in software, and where changing system is indeed just a software upgrade.
(And then with some extra software your phone could also be a police scanner, family radio, marine radio, GPS receiver, Iridium/Thuraya/Inmarsat phone, GSM jammer/base station/IMSI-catcher, spread spectrum low-probability-of-detection military radio or celldar unit. Fun!)
http://www.gnu.org/software/gnuradio/gnuradio.html for more
Can somebody please explain GSM vs WCDMA vs UMTS for the bands?
My impression is GSM is 2G and UMTS is 3G and both can supply regular phone service? What's WCDMA then?
T-mobile USA is GSM 850/1900 and what else?
I was thinking if I specify what network and band to use it'll use less batter (ie. no 3g unless I really need it).
this is a really easy google search... or just go to wikipedia....really any search you would try will answer your question.
(you're half right, but mostly wrong)...here's some links for you
http://lmgtfy.com/?q=wcdma+wiki&l=1
http://lmgtfy.com/?q=gsm+wiki
Well I did google already, but still is over my head when I look at the band settings in the TMO HD2.
If WCDMA = UMTS why is there a separate GSM/WCDMA network selection, both allowing bands in GSM and UMTS.
Sounds like GSM is older tech, meaning 2g, whereas 3g is the newer GSM, which is UMTS, which = WCDMA. Therefore, how can you choose UMTS band frequencies on a old GSM network?
Perhaps I'm not phrasing my question correctly. I'm asking these because of the phone settings. I'm trying to figure out if it's more efficient to just tell the phone to look for specific network/band for TMOUSA thereby saving time and battery.
is this just too simple of a question or not many people understand. anyone?
ok, instead of giving you a bunch of info, let me give you just what I think you need.
I'm guessing you're going to Settings>Wireless Controls> Phone>Band and that's where the confusion is coming from. This screen is wrong and the Bands listed there are wrong (they're from previous devices, and htc didn't bother to update that screen).
So, you have 3 main choices there that should be of interest to you as long as you're in the US on Tmobile's network: Auto, WCDMA, GSM (under Network Type).
Auto: switches automatically between GPRS/EDGE/3G (HSDPA, HSPDA+)
WCDMA: 3G (HSDPA, HSPDA+)
GSM: EDGE/GPRS
The only way that playing with the band frequencies could help you would be if you're just interested in Edge/GPRS since tmobile uses two different frequencies there (native 1900 and 850 roaming). For 3g however, Tmobile uses only (and concurrently....as in you need to use both to get 3g and not just one or the other) 1700/2100 frequency.
Long story short, if you're trying to keep the phone from switching between 3g and Edge and you're in an area that has constant 3g, set it to WCDMA. (but note that if you loose 3g but are in an area with Edge, it will not switch to Edge, it will just be 0 bars/reception).
thanks alot, that really clears it up. I don't have data connection besides mms so I figure I may set it to no 3g and save some battery.
Which one is better? I downloaded the network app and it shows phone by default is set to wcdma preferred
I thought I had read that cdma auto was better on battery life. Thoughts?
whats the difference between wcdma and cdma?
icantdrawanime said:
whats the difference between wcdma and cdma?
Click to expand...
Click to collapse
Well you know what they say "the more the merrier" so 'WCDMA' has more letters "oooohhh"
http://en.wikipedia.org/wiki/WCDMA
'While not an evolutionary upgrade on the airside, it uses the same core network as the 2G GSM networks deployed worldwide, allowing dual-mode operation along with GSM/EDGE; a feat it shares with other members of the UMTS family'
http://en.wikipedia.org/wiki/Cdma
Since we dont have WCDMA in america... wouldnt it be kind of pointless to be set to wcdma preferred?
Maybe thats whats causing all the high time w/out signals...
Does anyone know if the Verizon Trophy will do CDMA on AWS with the correct PRL on any of the available radio software?
Also is there a app or a way to show cdma call info such as channel, PN, rssi?
http://www.microsoft.com/windowsphone/en-us/buy/7/details.aspx?id=1685
It says "HSPA:AWS 2100" and that is the GSM Trophy. I think its safe to assume that the Verizon model supports it as well + CDMA.. but.. well.. AWS is new one on me. I won't pretend to fully understand what your talking about. XD *haha* I better go do some reading.
TheXev said:
http://www.microsoft.com/windowsphone/en-us/buy/7/details.aspx?id=1685
It says "HSPA:AWS 2100" and that is the GSM Trophy. I think its safe to assume that the Verizon model supports it as well + CDMA.. but.. well.. AWS is new one on me. I won't pretend to fully understand what your talking about. XD *haha* I better go do some reading.
Click to expand...
Click to collapse
AWS is advanced wireless services. It's the FCC name for the band of spectrum the 1700 and 2100mhz range.
What I'm not really sure about is if the same radio is used for both CDMA and HSPA. The phone can do AWS if using HSPA, but it uses the cellular and PCS bands for CDMA. (800 and 1900mhz)
The issue is that the radio need to be programmed for those bands and there is hardware needed to make it happen. So a phone programmed for 800mhz can't just switch to 2100mhz unless there is hardware present.
The Verizon version of the phone might just have an extra radio thrown into the case that operates seperatly from the GSM one. If that is the case then it wouldn't be possible to use CDMA on that frequency. If it's all tied into the same radio then it seems like it could be done in software. In either case I'm not sure if will ever happen because you'd probably need to write your own firmware to do so. (It really wouldn't make sense for HTC to waste time seeing if the phone would do CDMA on 2100 if it wasn't designed to)
For reference there is a great article covering the bands here:
http://www.phonescoop.com/articles/article.php?a=99
There is also the full version of the spectrum chart online here: http://www.ntia.doc.gov/files/ntia/publications/2003-allochrt.pdf
There is a dev screen you can get to on the phone to show signal strength and a few other options. If you dial ##634# you can select field trial. You can see Channel #, band class, Active Set Pilot PN, Rx Signal Strengh, Rx Power (dbm) under the EVDO screen. There is also a section for 1x and GPS. I'm not sure if another option shows up for HSPA if the phone is on GSM...
EDIT: The best I can tell is that AWS uses UMTS/WCDMA so the phone should support that. HSPDA is just a faster version of WCDMA so since the phone can do HSPDA on 2100mhz it would be able to slow down to WCDMA speeds. The only time I could see it possibly being an issue is if CDMA was being used on 2100mhz and not UMTS.
Only thing I am seeing inside of the newest Verizon Trophy software (mango v3 8107) is that they added support for CMAS.
Code:
[HKEY_LOCAL_MACHINE\Software\Microsoft\ShortMsg\Settings]
"CmasOperatorEnabled"=dword:1
[HKEY_CURRENT_USER\Software\Microsoft\ShortMsg\Settings]
"CMASAlertOption"=dword:1
[HKEY_CURRENT_USER\Software\Microsoft\SMS\Broadcast]
"TestPort"=dword:4370
As for radio, there is only one radio software.. but from what I can tell, the CPU/radio has all the same support as the Trophy GSM, but with the added CDMA. AWS should work, but only via GSM bands.
UMTS stands for Universal Mobile Telecommunication System. This system is used to handle high data traffic. It is a 3G networking standard which is used throughout much of the world as an upgrade to existing GSM mobile networks. UMTS makes use of WCDMA technology that shares much with CDMA networks used throughout the world, though it’s not compatible with them.Universal Mobile telecommunication system (UMTS) is one of the third generation (3G) mobile technologies, that uses WCDMA as the underlying standard and is standardized by the Third Generation Partnership Project (3GPP) and represents the European answer to International Telecommunication Union\’s (ITU) International Mobile Telecommunication 2000 necessities for 3G cellular radio systems.
UMTS supports transfer of data rate up to 1920 Kbit/s, but in a heavily loaded real-world system, typical users can expect performance of around 384 Kbit/s. But this is much greater than the 14.4Kbit/s of a single GSM error corrected data channel or multiple 14.4 Kbit/s channels in HSCSD, and offer the primary prospect of practical inexpensive access the World Wide Web on a mobile device and for the general use of MMS.
Thanks for this article, his commercial calling IS 3G, 3G+ for HSPA, for information.