Related
well through testing almost all of the roms here in this section i have found out that every rom does have 3g but if you select HSDPA/HSUPA you will lose your 3G connection and can only have it again if you disable HSDPA/HSUPA. This seems very odd because the hermes and kaiser would switch between the two depending on which one had the stronger connection. i welcome others to test this as i think it is interesting and should be looked into.
HackMimic said:
well through testing almost all of the roms here in this section i have found out that every rom does have 3g but if you select HSDPA/HSUPA you will lose your 3G connection and can only have it again if you disable HSDPA/HSUPA. This seems very odd because the hermes and kaiser would switch between the two depending on which one had the stronger connection. i welcome others to test this as i think it is interesting and should be looked into.
Click to expand...
Click to collapse
Hmmm Curious..
I am currently running RomeOS 1.21 and am about to update to 1.51.
mine switches no problem between the two.
If i can't get a HSDPA signal then it auto switches to 3G..
will see if the new rom changes anything.
Dean
let me know because i have been observing and have only seen it auto change from H to E or G whichs sucks when it use to go from H to 3G. travel the entire bay area for my job and both phones side by side with me act different. so wierd.
HackMimic said:
let me know because i have been observing and have only seen it auto change from H to E or G whichs sucks when it use to go from H to 3G. travel the entire bay area for my job and both phones side by side with me act different. so wierd.
Click to expand...
Click to collapse
I Thought H was the same as 3g. Isn't Att's 3G network run on HSDPA?
HackMimic said:
well through testing almost all of the roms here in this section i have found out that every rom does have 3g but if you select HSDPA/HSUPA you will lose your 3G connection and can only have it again if you disable HSDPA/HSUPA. This seems very odd because the hermes and kaiser would switch between the two depending on which one had the stronger connection. i welcome others to test this as i think it is interesting and should be looked into.
Click to expand...
Click to collapse
HSDPA/HSUPS is 3G. If you are referring to WCDMA vs HSPA there would not be a stronger connection for either because they are on the same frequency.
Fact is on the Hermes/Kaiser the HSPA was downstream only (HSDPA) , on the raph its has bi-directional HSPA (HSDPA and HSUPA) therefor the towers you are broadcasting to with the device will have HSPA mode on continuously as apposed to only when you are receiving from them since the device is receiving and transmitting using HSPA.....which is why the HSDPA mode "H" symbol only appeared during data transfer on the older devices, there was normally a short delay (when using the device as a modem for example) before the "H" appeared and the data began coming in.
Notice how you need to reboot if you choose to deactive HSPA alltogether? The radio stack probably needs to start a new session on the network to change from HSPA back to UMTS only. Indeed when you set standard 3G mode you should get the "3G" symbol rather than "H".
The service rep at ATT told me the other day that HSDPA is actually different then 3G. THe HSDPA is typically meant for the Laptop Connect cards. Since the inception of the iPhone on 3G if you haven't noticed your speeds have dropped significantly.
How true is this I don't know...but when I am using a ROM like RRE that has HSDPA my speeds are much faster then with 3G.
ryncppr said:
The service rep at ATT told me the other day that HSDPA is actually different then 3G. THe HSDPA is typically meant for the Laptop Connect cards. Since the inception of the iPhone on 3G if you haven't noticed your speeds have dropped significantly.
How true is this I don't know...but when I am using a ROM like RRE that has HSDPA my speeds are much faster then with 3G.
Click to expand...
Click to collapse
HSPA (3.5G) is just another coding method, it still uses the 3G frequencies as with UMTS (aka normal 3G). The theoretical bandwidth due to the more complex an efficient coding method means you can get ALOT more bandwidth down the same frequency than with UMTS. So technically UMTS and HSPA can both be encompassed into the "3G" terminology although they use different coding techniques, the video calling and voice stuff are handled identically afaik, data transmission is where they differ.
This kind of improvement can be seen in the 2G technologies with GSM/GPRS/EDGE.
HSDPA is a "higher speed" data connection than 3G... but its still a "3G" frequency data connection. So on-the-face-of-it, they are one and same, just one is faster than the other.
thank you so much. i am a very visual and analytical person. love to compare behavour. glad i got a real answer about this as i have been reading for days on this and it seems kind of cloudy with the fuze on information. thank you again for the replys.
Wow, there's quite a bit of information, some conflicting, about the various 3G-related terminologies here. So I might as well add my take on it all
Let's compare 2G terminologies to 3G ones, as that should make it easier for some to understand.
GSM - the very basic 2G standard
UMTS - the very basic 3G standard
GPRS - upgraded GSM to packet switching - faster data access - dubbed 2.5G
HSDPA - upgraded UMTS to faster downlink speeds - dubbed 3.5G
EDGE - upgraded GPRS to faster data access - dubbed 2.75G
HSUPA - upgraded UMTS to faster uplink speeds - dubbed 3.75G (occasionally)
Finally, HSPA is simply a term encompassing HSDPA and HSUPA.
I hope this helps more than it hurts
Trancecoder said:
GSM - the very basic 2G standard
UMTS - the very basic 3G standard
GPRS - upgraded GSM to packet switching - faster data access - dubbed 2.5G
HSDPA - upgraded UMTS to faster downlink speeds - dubbed 3.5G
EDGE - upgraded GPRS to faster data access - dubbed 2.75G
HSUPA - upgraded UMTS to faster uplink speeds - dubbed 3.75G (occasionally)
Click to expand...
Click to collapse
There i fixed it for you
shotta35 said:
There i fixed it for you
Click to expand...
Click to collapse
WCDMA is the air interface for UMTS as
TDMA is the air interface for GSM.
At the same time, GSM is used to describe a phone system that uses GSM/TDMA and UMTS/WCDMA versus the CDMA phone system used by Sprint/Verizon/Qualcomm.
Confused yet?
NuShrike said:
WCDMA is the air interface for UMTS as
TDMA is the air interface for GSM.
At the same time, GSM is used to describe a phone system that uses GSM/TDMA and UMTS/WCDMA versus the CDMA phone system used by Sprint/Verizon/Qualcomm.
Confused yet?
Click to expand...
Click to collapse
PLEAAAASEEE can we go into how OFDM and QPSK work?? i want to see some heads explode...scanners style.
NuShrike said:
WCDMA is the air interface for UMTS as
TDMA is the air interface for GSM.
At the same time, GSM is used to describe a phone system that uses GSM/TDMA and UMTS/WCDMA versus the CDMA phone system used by Sprint/Verizon/Qualcomm.
Confused yet?
Click to expand...
Click to collapse
LOL, newbs reading this will and should be confused. I only edited it to make his comparisons between GSM and UMTS which is should be, not GSM and WCDMA which aren't in the same "group"
shotta35 said:
LOL, newbs reading this will and should be confused. I only edited it to make his comparisons between GSM and UMTS which is should be, not GSM and WCDMA which aren't in the same "group"
Click to expand...
Click to collapse
*head explode*
what are decent speeds for HSPA connections?
shotta35 said:
There i fixed it for you
Click to expand...
Click to collapse
Thanks. I really shouldn't post anything when it's late, especially when my head feels twice its size due to a particularly annoying cold
NuShrike and Mr. Vanx has explained it.
These jargons always confusing for us, laymans. Easiest term is i think CDMA (2000,1X, EVDO) is used almost exclusively in US, while GSM and WCDMA (UMTS) is in almost everywhere else of the world (around 3.5 billon users as of now - open www.gsmworld.com). Except Japan, they have their own customized system.
Reasons of difference? Matter of choice, more like when you decide using VHS instead of BetaMax. I think part of the reason why US choose CDMA instead of GSM you may ask Qualcomm's technical people, as they hold majority of the copyrights and licenses in CDMA technology. Not only in driverless chipsets... LoL.
Actually, we in Indonesia also adopt CDMA in smaller and narrower market. But the gov limit them to be Fixed Wireless. Now, what does the jargon: Fixed Wireless means?? Another head exploded... LoL =D
3G icon shows when the phone's sitting idle, H shows when data's being transferred.
My phone shows H all the time now because this market has moved on from UMTS + HSPDA to a HSPA market now. This is ONLY as a result of using the non-AT&T ROM, if you use that it will say 3G because AT&T has disabled it (the icon, not speeds) to cause less confusion.
As for what's typical HSPA speeds? Well on the AT&T network i've seen as high as 2Mbps (on a 3.6Mbps HSPA network) but there are places in Europe that are deploying 7.2Mbps and in Australia they are launching 21Mbps!!!
For the life of me, I can't figure this one out. I've searched high and low but haven't found an answer.
How, on an Android (2.1) phone, can I detect what band am I currently using.
No, it doesn't support locking onto single band (choices are only 2G, 2G/3G, 3G).
No, I can't ask my provider, because they support BOTH bands simultaneously.
No, I can't figure it from a coverage map, since BOTH bands cover my location.
I'm using Samsung Galaxy S (and HTC Desire when it comes from service...), both European versions that support 900MHz and 2100MHz bands (for UMTS).
Is there a way/app/script/ANYTHING that can show me what band the phone is currently using?
The reason for this is that, as I said, in my location there are BOTH types of antennas and even though the coverage is marketed as good, I get very poor signals. I suspect that the phones locks onto just one of the bands (for any reason) and that the other one might be a better choice.
3G band reception is usually worse than 2G because it has a shorter range than 2G and it doesn't have so much building/wall penetration than 2G. I suggest you try setting your phone to use 2G only (in network settings) and try it out. The phones are made so they use the fastest network even if the signal strength is worse.
Sent from my GT-I9000 using XDA App
peewo said:
3G band reception is usually worse than 2G because it has a shorter range than 2G and it doesn't have so much building/wall penetration than 2G. I suggest you try setting your phone to use 2G only (in network settings) and try it out. The phones are made so they use the fastest network even if the signal strength is worse.
Sent from my GT-I9000 using XDA App
Click to expand...
Click to collapse
Yeess...? And your point concerning my question was exactly what? How does that help me to detect which UMTS band my phone is operating on? By turning it OFF?
I'm sorry, but either you didn't read it at all, just completely missed my point, or are trying to piss me off. (sorry, I'm just sooooo tired that people don't read the posts they answer to, or just completely miss the point of the post.)
Sorry. But. UMTS = 3G. So turning 3G OFF does NOT, in the slightest, help me detect what I originally asked for.
Just to be PERFECTLY clear: YES, 3G/UMTS works on BOTH 900MHz AND 2100MHz channels here in Finland. Yes, 900MHz 3G. Not a typo.
I also want to know this question
Same here... No app... come onnnnnnn
Just type *#0011# in the dialer dude. It will tell you which band you're on.
Hi
Our O1 is HSDPA 7.2 Mbps acroding to spec sheets but in the settings it shows either GSM or WCDMA. There is no HSDPA.
Is HSDPA included in the GSM settings?
I am getting very low speeds even when it says 3G in the notifications bar so was just wondering.
WCDMA deployments are usually marketed as UMTS.
UMTS networks in many countries have been or are in the process of being upgraded with High Speed Downlink Packet Access (HSDPA), sometimes known as 3.5G.
So the answer to your question is: HSDPA is included in WCDMA settings. Or properly said, it is a feature of the WCDMA connection mode. Your phone supports it. If you get low speeds, then your operator doesn't offer this service in your area. Or at all.
If you have never seen an "H" in your status bar, only "G" or "3G", that't the answer: no such service in your area from your mobile operator.
I actually see H and 3G most of the time with it goin to E(EDGE) or G(GPRS) very rarely.
I was just wondering why it wasn't given in the settings.
And the speeds remain poor. Even at nights, assuming less traffic/users, the speeds rarely rise above 40 KBps. I am not looking for 3.6 Mbps or 7.2 Mbps but atleast speeds in the range of 1Mbps(128KBps) should be there.
Anyway, i guess its my operator that sucks!
Now that number portability has been rolled out here in India its time to switch operators!
Thanks for the reply. Upped that meter a little for ya!
kewlsid05 said:
I was just wondering why it wasn't given in the settings.
Click to expand...
Click to collapse
The reason why you don't see HSDPA as an option in your menu is because the WCDMA connection will automatically work at its best: HSDPA if available or 3G otherwise. Low speed even if your phone is connected using HSDPA is definitely your operator's fault.
Glad I was able to shed some light on this matter and thanks for the appreciation.
hello all,
I was wondering whether it is possible to unlock the LTE radio on the Eu retail version. I think the chipset is the same and hence it does have the capability.
Thanks in advance,
Santanu Dey
Are you saying that your razr never gets 4G / HSDPA signal?
Don't you ever get the little 'H' on your connection indicator?
CheesySeb said:
Are you saying that your razr never gets 4G / HSDPA signal?
Don't you ever get the little 'H' on your connection indicator?
Click to expand...
Click to collapse
Not even LTE is 4G. It is called such for pure marketing speculation since LTE is still part of UMTS... it is its 8th revision, actually.
Cheesy, you should first ask your provider if they reach ~325Mbps. Vodafone, the european carrier with the best network, sells 48Mbps (HSPA++) as LTE, which isn't really.
LTE isn't yet fully ratified, actually.
Anyway, it works
For general information:
LTE is Long Term Evolution.
HSPA or High speed packet access and its derivatives are not LTE...
The modulation scheme is different as well as the coding and spectrum and Bandwidth. LTE works in 2 variations TDD and FDD, whereas HSPA/UMTS is purely FDD. Secondly, LTE works in 1.4Mhz, 5 MHz, 10Mhz , 20Mhz Bandwidth whereas HSPA/UMTS is only 5 Mhz.
Basically HSPA is a evolution of data access on UMTS network, as EDGE was in GSM network.
So , returning back to the same question..... Can we unlock LTE radio on the Razr? My operator Telia is already having commercial LTE network (300/100 Mbps DL)..
Beg my pardon I was not aware ( haven't done quite as much research as you guys it would seem ;D )
Can I just ask briefly, is LTE a cdma standard as opposed to gsm or is it something viable on both platforms?
LTE is basically a convergent network between the CDMA and the GSM domains. The radio standard has been designed in such a way that it shares the backward compatibility towards CDMA and GSM domains..."BUT".. LTE is much more bent toward the GSM/WCDMA domain than CDMA/EVDO domains,since it shares the same spectral characteristics of the UMTS networks.
WIMAX on the other hand is more bent towards CDMA/EVDO domains...
I am having trouble in an area where Immix wireless is the carrier which is GSM 1900, im on ST(ATT most times WCDMA 1900) and a roaming agreement exists. But when I am in this area, data never connects. Our i777's should automatically switch from WCDMA 1900 to GSM 1900 correct? My baseband is UCLE5 btw. Thanks.
pahick said:
I am having trouble in an area where Immix wireless is the carrier which is GSM 1900, im on ST(ATT most times WCDMA 1900) and a roaming agreement exists. But when I am in this area, data never connects. Our i777's should automatically switch from WCDMA 1900 to GSM 1900 correct? My baseband is UCLE5 btw. Thanks.
Click to expand...
Click to collapse
did you verify that you have enabled all the bands?
nisssan18 said:
did you verify that you have enabled all the bands?
Click to expand...
Click to collapse
How would you do that? I777 modems are locked and should switch automatically, correct?