Hello guys, so sry for my English, because i`m from Ukraine. I have trouble with GSM.. I can`t use this standart, only WCDMA\LTE.When I tap on the "Only GSM" phone don`t registered.. I think it`s error in the Service Menu..
WCDMA (Wide Band Code Division Multiple Access) or UMTS (Universal Mobile Telephone System) – this standard has been developed to accept higher rates up to 2 Mbps (to 2 Mbps (local area access) or 384 Kbps (wide area access)) allowing to surf the net, use the videophone, download video…WCDMA is a third-generation (3G) mobile wireless technology.
http://cellphones.about.com/od/cell_phone_glossary/g/wcdma.htm
To obtain higher speeds, HSDPA (high speed downlink packet access) was introduced in version 5 of the WCDMA (3GPP). HSDPA allows data rates up to 10 Mbps (and 20 Mbps for MIMO (Multiple Input Multiple Output)).
http://www.wisegeek.com/how-do-i-choose-the-best-hsdpa-phones.htm
GSM/WCDMA (WCDMA preferred) – The GSM phone can use both 2G and 3G data communication and when signal strength is low 3G is favored more.
GSM only – The GSM phone use only 2G data communication. When the 2G signal is too low you get nothing.
WCDMA only – The GSM phone use only 3G data communication. When the 3G signal is too low you get nothing.
* WCDMA is the standard that most GSM carriers moved to when upgrading to 3G. Parts of the WCDMA standard are based on GSM technology. WCDMA networks are designed to integrate with GSM networks at certain levels. Most WCDMA phones include GSM as well, for backward compatibility. So you can leave it as it is.
Joku1981 said:
WCDMA (Wide Band Code Division Multiple Access) or UMTS (Universal Mobile Telephone System) – this standard has been developed to accept higher rates up to 2 Mbps (to 2 Mbps (local area access) or 384 Kbps (wide area access)) allowing to surf the net, use the videophone, download video…WCDMA is a third-generation (3G) mobile wireless technology.
http://cellphones.about.com/od/cell_phone_glossary/g/wcdma.htm
To obtain higher speeds, HSDPA (high speed downlink packet access) was introduced in version 5 of the WCDMA (3GPP). HSDPA allows data rates up to 10 Mbps (and 20 Mbps for MIMO (Multiple Input Multiple Output)).
http://www.wisegeek.com/how-do-i-choose-the-best-hsdpa-phones.htm
GSM/WCDMA (WCDMA preferred) – The GSM phone can use both 2G and 3G data communication and when signal strength is low 3G is favored more.
GSM only – The GSM phone use only 2G data communication. When the 2G signal is too low you get nothing.
WCDMA only – The GSM phone use only 3G data communication. When the 3G signal is too low you get nothing.
* WCDMA is the standard that most GSM carriers moved to when upgrading to 3G. Parts of the WCDMA standard are based on GSM technology. WCDMA networks are designed to integrate with GSM networks at certain levels. Most WCDMA phones include GSM as well, for backward compatibility. So you can leave it as it is.
Click to expand...
Click to collapse
I know it`s all.. I can`t connect to 2G
Related
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.
I'm curious what everyones Preferred Network Type is on their G2.
You get there by...
Go to "Phone"
Type *#*#4636#*#* (Don't hit send, you will see a screen appear)
Click "Phone Information"
Scroll down until you see "Set Preferred Network Type" and post what it says
The reason I want to know is because I did this and my phone's preferred network type says "WCDMA perferred".
Does anyone know if changing this value to GSM Prl will be more suitable for this GSM phone or does it not matter?
I switched mine to GSM Preferred PRL and I seem to get better battery life. It has a higher threshold before it switches from E to H. In places with good H signal it doesn't seem to make a difference.
I'm happy with it this way.
Sent from my T-Mobile G2 using XDA App
From the N1 thread I used to lurk in religiously.
WCDMA preferred - The GSM phone is capable of using both 2G and 3G data communication and when signal strength is low 3G is favored more.
GSM only - The GSM phone is capable of using only 2G data communication. When the 2G signal is too low you get nothing at all.
WCDMA only - The GSM phone is capable of using only 3G data communication. When the 3G signal is too low you get nothing at all.
GSM auto (PRL) - The GSM phone is capable of using both 2G and 3G data communication and when signal strength is low 2G is favored more. This one is a bit confusing to me since PRL is associated mostly with CDMA technology and not GSM technology.
CDMA auto (PRL) - The CDMA phone is capable of using both 2G and 3G data communication and when signal strength is low 2G is favored more.
CDMA only - The CDMA phone is capable of using only 2G data communication. When the 2G signal is too low you get nothing at all.
EvDo only - The CDMA phone is capable of using only 3G data communication. When the 3G signal is too low you get nothing at all.
GSM/CDMA auto (PRL) - Some phones are equipped with both GSM and CDMA capabilities. This setting appears to just have the phone attempt to stay connected to the data communication type that works the best. (Maybe the Samsung Galaxy S will take advantage of this???)
Unknown - If none of the above fit or the phone is acting weird as far as connecting to the carrier, you will see your preferred network type is set to this.
Also, WCDMA uses more power because it is constantly scanning for connections and will always prefer 3G connections; have a lower threshold to use 3G.
GSM AUTO PRL has a higher threshold for 3G, generally about 2 bars or slightly lower so far I've noticied.
i cannot change network type. default is wcdma preferred. i click gsm only or wcdma only and it defaults back to wcdma preferred. Help! I cannot save the setting. I have galaxy note i717.
Well basic question...
How many different dial Menus do we have ?
##PROGRAM
SPC is 000000
Also had Radio items here
*#*#4636#*#*
Radio Menu
*#06#
Display IMEI
Some of the Options Explained:
WCDMA preferred - The GSM phone is capable of using both 2G and 3G data communication and when signal strength is low 3G is favored more.
GSM only - The GSM phone is capable of using only 2G data communication. When the 2G signal is too low you get nothing at all.
WCDMA only - The GSM phone is capable of using only 3G data communication. When the 3G signal is too low you get nothing at all.
GSM auto (PRL) - The GSM phone is capable of using both 2G and 3G data communication and when signal strength is low 2G is favored more. This one is a bit confusing to me since PRL is associated mostly with CDMA technology and not GSM technology.
CDMA auto (PRL) - The CDMA phone is capable of using both 2G and 3G data communication and when signal strength is low 2G is favored more.
CDMA only - The CDMA phone is capable of using only 2G data communication. When the 2G signal is too low you get nothing at all.
EvDo only - The CDMA phone is capable of using only 3G data communication. When the 3G signal is too low you get nothing at all.
GSM/CDMA auto (PRL) - Some phones are equipped with both GSM and CDMA capabilities. This setting appears to just have the phone attempt to stay connected to the data communication type that works the best. (Maybe the Samsung Galaxy S will take advantage of this???)
Unknown - If none of the above fit or the phone is acting weird as far as connecting to the carrier, you will see your preferred network type is set to this
Information has be sourced and pieced together from around the Web.
And seems to hold true on our devices.
Just a bit of a curious observation. Coming from the US almost 2 years ago, while connected to a HSPA network, my android would always display the 'H' icon, whether in a state of active download and/or uploading or not. Occasionally, it would fall back to an E logo for the EDGE network within buildings, etc.
Now, here in NL, over the course of 2 years I've subscribed to two different providers and both exhibited similar behavior (KPN and Vodafone for you Dutchies). Within good reach of the towers, my phone shows the 3G icon, but when actively downloading or uploading something, as exhibited by the up and down arrows, the H icon is immediately displayed, and when active DL/UL stops, the H icon changes back to the 3G icon.
Is this constant switching a network-capacity measure taken by the providers here to limit the number of devices communicating with the faster (H/H+) equipment?
It may depend on the type of UTMS. It may be DC-HSPA down to another form. It could just be your ROM too.
Sent from my XT862 using xda app-developers app
Depends on the network you use. If your network supports UMTS (displayed 3G in android) then your connection falls back on UMTS to save power. If the bandwidth is needed it will ramp up to HS(D)PA (H) or HSPA+ (H+). Some networks just have HSDPA and HSPA+ and no UMTS, therefore they will jump between H and H+ depending on network load.
androo45 said:
Depends on the network you use. If your network supports UMTS (displayed 3G in android) then your connection falls back on UMTS to save power. If the bandwidth is needed it will ramp up to HS(D)PA (H) or HSPA+ (H+). Some networks just have HSDPA and HSPA+ and no UMTS, therefore they will jump between H and H+ depending on network load.
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Click to collapse
Are you sure about this? First, I thought HSDPA and HSPA+ are UMTS enhancements, and at their core, are still UMTS-based. Secondly, I've not seen it indicated that H or H+ would require more power than UMTS which has not been enhanced or upgraded to the newer UMTS implementations.
floepie said:
Are you sure about this? First, I thought HSDPA and HSPA+ are UMTS enhancements, and at their core, are still UMTS-based. Secondly, I've not seen it indicated that H or H+ would require more power than UMTS which has not been enhanced or upgraded to the newer UMTS implementations.
Click to expand...
Click to collapse
At the core it is still UMTS. Hence it jumps a millisecond to UMTS if it is switching between HSPA+ and HSDPA. The UMTS 'core' is there, but not made available by my carrier to be used by my phone.
The UMTS/HSDPA power draw comparison is my experience: on HSPDA data i lose about 35-40% a night (=8h) while I do maybe 10-15% on UMTS (other provider)
What is GSM?
GSM (Global System for Mobile Communications, originally Groupe Spécial Mobile), is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe protocols for second-generation (2G) digital cellular networks used by mobile phones. As of 2014 it has become the default global standard for mobile communications - with over 90% market share, operating in over 219 countries and territories.[2]
2G networks developed as a replacement for first generation (1G) analog cellular networks, and the GSM standard originally described a digital, circuit-switched network optimized for full duplex voice telephony. This expanded over time to include data communications, first by circuit-switched transport, then by packet data transport via GPRS (General Packet Radio Services) and EDGE (Enhanced Data rates for GSM Evolution or EGPRS).
GSM carrier frequencies
GSM networks operate in a number of different carrier frequency ranges (separated into GSM frequency ranges for 2G and UMTS frequency bands for 3G), with most 2G GSM networks operating in the 900 MHz or 1800 MHz bands. Where these bands were already allocated, the 850 MHz and 1900 MHz bands were used instead (for example in Canada and the United States). In rare cases the 400 and 450 MHz frequency bands are assigned in some countries because they were previously used for first-generation systems.
Most 3G networks in Europe operate in the 2100 MHz frequency band. For more information on worldwide GSM frequency usage, see GSM frequency bands.
Regardless of the frequency selected by an operator, it is divided into timeslots for individual phones. This allows eight full-rate or sixteen half-rate speech channels per radio frequency. These eight radio timeslots (or burst periods) are grouped into a TDMA frame. Half-rate channels use alternate frames in the same timeslot. The channel data rate for all 8 channels is 270.833 kbit/s, and the frame duration is 4.615 ms.
The transmission power in the handset is limited to a maximum of 2 watts in GSM 850/900 and 1 watt in GSM 1800/1900.
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Source: Wikipedia
For more information about this subject, visit this link on wikipedia