Database Users

G1 using AT&T 3G???

Before I get started, I already know that AT&T and TMobile are using different UMTS bands and that's why the G1 won't work on AT&T's 3G network. I've read many threads on this topic.
But...
I saw this...
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...in another thread and it really got me wondering. The two Avago chips seem to control the frequecy used. What if one were to replace the ACMP-7381 with an ACMP-7331-TR1 and also replace the ACMP-7391 with an ACMP-7311-TR1? I checked the datasheets (available on the Avago website) and they all seem to be pin compatible.
Would I be willing to try it? Ummm... I don't know! I'm just curious if anybody else has any thoughts or comments?

So you want to carefully unsolder the chip and solder another, then pray it doesn't cause some problems with the logic circuit and finally spend lots of time messing with the phones firmware. Just to get 3G speeds where you already can get edge speeds.
If you want to do it as a project to see if you can, then I say cool, but if you are doing this just for 3G speeds on the AT&T network, then I think it's pointless, especially with the massive 3G rollouts T-Mobile is now doing.

i will post photos of the Canadian htc dream circuit board in a few hours.

I am VERY interested! I had my G1 on at&t with EDGE but finally switched to T-mobile for 3G with unimpressive results. I would be hesitant to try since Ive never messed with these components but I was able to do the LED soldering mod to my Samsung and Nokia back in the day and made a few circuit boards in school. I definitely think I could physically complete the hardware swap its just what happens next that Im worried about. lol

What if the component your swapping has a different Ω rating? This could undervolt or even worse burn out other components. Now were talking about adding resistors or possibly removing other ones already exsisting on the board. Not to mention that this board is SMT (surface mount), meaning there aren't any solder points on the bottom and the components don't have pins unless they are heavy and then they are only little plastic stabilizers.

You're looking at much more cost and hassle than it's probably worth.
Also, would the stock antenna work with the different frequency?

crapy pics
THE ONE WITH THE BLUE DOT IS THE ROGERS DREAM (the other one is t-mobile G1)
sorry that i didn't have a good camera but i tried..
gallery:
http://img26.imageshack.us/gal.php?g=1000387n.jpg
direct links:
http://img26.imageshack.us/img26/2493/1000387n.jpg
http://img196.imageshack.us/img196/1443/1000391xhu.jpg
http://img266.imageshack.us/img266/5339/1000392.jpg
http://img198.imageshack.us/img198/6840/1000395k.jpg
http://img40.imageshack.us/img40/2313/1000403h.jpg
http://img197.imageshack.us/img197/1760/1000409k.jpg
http://img26.imageshack.us/img26/434/1000410o.jpg
http://img40.imageshack.us/img40/2037/1000411x.jpg
http://img23.imageshack.us/img23/2975/1000412jlh.jpg
http://img200.imageshack.us/img200/5475/1000413u.jpg
http://img19.imageshack.us/img19/2125/1000414w.jpg
http://img31.imageshack.us/img31/449/1000415.jpg
http://img37.imageshack.us/img37/3241/1000417i.jpg
http://img200.imageshack.us/img200/6424/1000420v.jpg

SiXiam said:
If you want to do it as a project to see if you can, then I say cool, but if you are doing this just for 3G speeds on the AT&T network, then I think it's pointless, especially with the massive 3G rollouts T-Mobile is now doing.
Click to expand...
Click to collapse
Yeah... I guess I'm just a tinkerer at heart! I'm really not that unhappy with edge speeds most of the time.
aggtrfrad said:
i will post photos of the Canadian htc dream circuit board in a few hours.
Click to expand...
Click to collapse
woot! Very interested to see those photos. Doh! Posted them at the same time I replied!!
SiXiam said:
What if the component your swapping has a different Ω rating? This could undervolt or even worse burn out other components. Now were talking about adding resistors or possibly removing other ones already exsisting on the board. Not to mention that this board is SMT (surface mount), meaning there aren't any solder points on the bottom and the components don't have pins unless they are heavy and then they are only little plastic stabilizers.
Click to expand...
Click to collapse
I come from a computer engineering background. I know all about surface mount components and how difficult soldering can be. I could pour over the datasheets a bit more if I decide to pursue this any further and even speak to a rep from Avago. I'm more concerned about the software at this point. I'm wondering if I would need to make firmware changes?
breaultm said:
You're looking at much more cost and hassle than it's probably worth.
Also, would the stock antenna work with the different frequency?
Click to expand...
Click to collapse
Don't know about the antenna, but I doubt the cost of those two ICs is gonna break the bank. Ya know?
Thanks for the replies... Anybody have any thoughts on the firmware?

aggtrfrad said:
THE ONE WITH THE BLUE DOT IS THE ROGERS DREAM (the other one is t-mobile G1)
sorry that i didn't have a good camera but i tried..
gallery:
http://img26.imageshack.us/gal.php?g=1000387n.jpg
Click to expand...
Click to collapse
BOOYAH!! See, it's right there! Those two small ICs in the upper left-hand corner: Avago 7311 and Avago 7331!

Ok, so I compared the two boards a little closer. The board itself appears to be the same. The two Avago chips are the same as I originally suggested. However, several of the smaller resistors and/or capacitors appear to be different. I bet this mod is theoretically possible, but it's probably more trouble than it's worth.

wow hmmm tell me if it works if you solder it right

i too have been thinking about this, but i am not gonna take apart the G1 again, it was enough of a hassle keeping that damn void sticker from breaking. i have a few phones that are compatible on ATT 3G and t-mobile 3G and thought about switching the cips, but i don't think i am up for the challenge. my 8525 has been apart for almost a year and a half now and i lost most of the screws so it's in a box waiting for me to come up with some project for the parts

Nexus One 3G Issues (h/w)

Hi guys.
Please have a look at these reports:
http://www.tmonews.com/2010/01/nexus-one-incurring-3g-problems/
http://www.engadget.com/2010/01/09/google-support-forums-rife-with-nexus-one-3g-complaints-is-this/
http://www.erodov.com/forums/nexus-has-one-major-pr-nightmare-coming-up-3g-issue/28857.html
and the source forum thread:
http://www.google.com/support/forum...c2&hl=en&fid=0bd8ccd4799040c200047c9a22ea5c23
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Is anyone else having spotty 3G coverage where as the same sim is having proper 3G coverage with another device?
Please report back.
Regards.

I haven't noticed any difference here.

mark925 said:
I haven't noticed any difference here.
Click to expand...
Click to collapse
Did you compare it with another phone? How many bars of signal?

Mine's getting the same 3G coverage my Cliq was

I've never had 3g problemo's...then again im on wifi most of the time

TFJ4 said:
I've never had 3g problemo's...then again im on wifi most of the time
Click to expand...
Click to collapse
Thats the thing with smart phones, being on 3G most of time, you don't realize the 3G speeds.

My 3g was solid when i went int town... ****ty at home but thats what wifi is for
personally i think if there is a problem its with tmobile's network... they just rolled out a new system and their service has never been "verizon" as it is... give it time children... i think everyone just likes to throw a fit about everything for the sake of kickin and screaming

haha i just checked the map around my house and there is like speckles of 3g all around my house but not directly over where my house would be... i get 3g in random parts of my house and edge upstairs in my room... pretty funny that the map of their reflects my situation so well
i cannot wait to get back to tempe, the whole phoenix metro area is one big purple blotch on the coverage map lol

JHaste said:
My 3g was solid when i went int town... ****ty at home but thats what wifi is for
personally i think if there is a problem its with tmobile's network... they just rolled out a new system and their service has never been "verizon" as it is... give it time children... i think everyone just likes to throw a fit about everything for the sake of kickin and screaming
Click to expand...
Click to collapse
I totally agree... but have a look:
http://www.twitpic.com/x3zm0
How can the same provider (T-mobile) have 3G in the G1 but Edge on the Nexus One?

Its quite possible though that this is a measure implemented by Google to keep the phone in low power EDGE mode when you are not actively using the data connection? That way the phone lasts a lot longer? Just guessing...

I think it's more of a T-Mobile issue than a N1 issue. I originally ordered it with a T-Mobile SIM/plan, but ended up having to use it with AT&T on EDGE since I couldn't get a signal at all indoors and it dropped down to GRPS when I was inside a restaurant in the middle of Downtown LA!

dsjr2006 said:
I think it's more of a T-Mobile issue than a N1 issue. I originally ordered it with a T-Mobile SIM/plan, but ended up having to use it with AT&T on EDGE since I couldn't get a signal at all indoors and it dropped down to GRPS when I was inside a restaurant in the middle of Downtown LA!
Click to expand...
Click to collapse
Did you see the image in the first post? Two phones side by side (both TMob... I am hoping) with one having 3 Bars (3G) and other having 4 bars (EDGE)

KiD0M4N said:
I totally agree... but have a look:
http://www.twitpic.com/x3zm0
How can the same provider (T-mobile) have 3G in the G1 but Edge on the Nexus One?
Click to expand...
Click to collapse
not to be a bastard, but how do you know theres not an ATT card in that nexus one?
KiD0M4N said:
Its quite possible though that this is a measure implemented by Google to keep the phone in low power EDGE mode when you are not actively using the data connection? That way the phone lasts a lot longer? Just guessing...
Click to expand...
Click to collapse
DING DING DING! i read through a good portion of the google thread at the top and then skimmed the rest and thats what i was thinking may be happening... the guy was playing pandora on 3g with no problem, soon as he gets near it to play around it goes to edge? sounds to me like maybe a power saving mechanism... like the cpu it only uses the high end data rates when necessary, crafty if thats actually what its doing and it is working right... I shall run tests tomorrow when i go into town for dinner and such
personally though, the phone has been out on the streets for like 72 hours... bite your tongue for 10 days straight and if **** still doesnt fly by your book you have 4 days left on that RMA date... iphone release days anyone? att/apple about cried...

JHaste said:
not to be a bastard, but how do you know theres not an ATT card in that nexus one?
Click to expand...
Click to collapse
Probably because the Nexus One can't use AT&T 3G network, just 2G.

I've been paying close attention to reception since I got my NOne yesterday, and so far it seems to change at exactly the same times my G1 would. Upstairs 3g is strong, downstairs it drops to EDGE - just like my G1.
The only difference I notice is the NOne does it much faster.

I have a mytouch, G1 and N1 all on tmob and I have 3G on all three all the time, must be certain areas, or larger markets maybe?

NordicZz said:
Probably because the Nexus One can't use AT&T 3G network, just 2G.
Click to expand...
Click to collapse
my point exactly... lol

JHaste said:
not to be a bastard, but how do you know theres not an ATT card in that nexus one?
DING DING DING! i read through a good portion of the google thread at the top and then skimmed the rest and thats what i was thinking may be happening... the guy was playing pandora on 3g with no problem, soon as he gets near it to play around it goes to edge? sounds to me like maybe a power saving mechanism... like the cpu it only uses the high end data rates when necessary, crafty if thats actually what its doing and it is working right... I shall run tests tomorrow when i go into town for dinner and such
personally though, the phone has been out on the streets for like 72 hours... bite your tongue for 10 days straight and if **** still doesnt fly by your book you have 4 days left on that RMA date... iphone release days anyone? att/apple about cried...
Click to expand...
Click to collapse
True that. Still waiting for ma phone to be delivered Hope it is all well...

JoshHart said:
I have a mytouch, G1 and N1 all on tmob and I have 3G on all three all the time, must be certain areas, or larger markets maybe?
Click to expand...
Click to collapse
Thats another possibility as well.
If you all remember, the 3GS used to 'reflect' the fact that it had dropped out of 3G a lot earlier than the 'iPhone 3G' and that lead ppl to believe that the 3GS has poor 3G reception.
Maybe it is a similar situation here...

Anyone having this problem in the UK?

Is this a clear wimax tower?

I was wondering if someone familiar with what the clear wimax towers look like could tell me if this was one of them, or something else. The photo below was taken at a dept. of public works building, so I was not sure if it could be something used for radio communication instead. I didn't want to get all hyped up if it was something like that.
Thanks
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It does look like a cell phone tower, but I don't know if we can tell if it's specifically a clear tower from those pics.

Cool, I drove by one location that I know is a sprint tower and it had something similar but it was too dark to snap a pic. I tried to compare it to some images on google but I'm no expert and have no idea what a regular cell tower without wimax looks like. Guess I could google that too, lol.

Other than possibly being a little different in length to account for the difference in the frequencies Sprint/Clear are using for WiMax, the antennas probably wouldn't look that different. If the frequencies were the same (and quite possibly even if they aren't), the antennas could very well be identical. The antennas are mostly concerned with what frequencies they are dealing with and how much power. WiMax is pretty much just a payload on that signal.

Looks like the antenna that sends wifi to my house (no cable net out here in the sticks) except there's a lot more of them on my tower.
You have been EVOfied.

I doubt that tower has WiMax antennas. You can usually tell because there'll be a microwave relay antenna on the tower (not always, if the tower's got plenty of fiber connecting it to the backbone) but the actual WiMax antennas are long, wide, and flat antennas typically.
You can see if the location is in fact a tower by checking the Clear coverage map on clear.com. It's fairly accurate about tower locations, but won't show testbed networks (where WiMax hasn't officially been turned on yet).
EDIT: Attached are two pictures of a WiMax tower behind one of the remote sites I work at. The top antennas are cellular, the middle ring is WiMax and the microwave antenna, and the bottom ring are NEXTEL/iDEN antennas. This is my best understanding of the system.

drmacinyasha said:
I doubt that tower has WiMax antennas. You can usually tell because there'll be a microwave relay antenna on the tower (not always, if the tower's got plenty of fiber connecting it to the backbone) but the actual WiMax antennas are long, wide, and flat antennas typically.
You can see if the location is in fact a tower by checking the Clear coverage map on clear.com. It's fairly accurate about tower locations, but won't show testbed networks (where WiMax hasn't officially been turned on yet).
EDIT: Attached are two pictures of a WiMax tower behind one of the remote sites I work at. The top antennas are cellular, the middle ring is WiMax and the microwave antenna, and the bottom ring are NEXTEL/iDEN antennas. This is my best understanding of the system.
Click to expand...
Click to collapse
Bottom sector is Nextel? I didn't know Nextel used TMA's and Ret motors etc...

looks like a temp 4g tower to me we had those here in texas but now there huge and took those off

If u can get close to the station see if you can see a smaller power looking box on the ground. I say smaller bc the wimax network boxs are like 1/5th the size of the regular ones. Itd also look new too. No taller than a suv and no wider than a car in square form somewhat.
Google it theres a news special someone did on the stuff and they showed the units upclose.
Sent from my PC36100 using XDA App

That is correct sgt. slaughter. If you get close to the tower, I would love to know the speedtest on that. Has to be crazy fast.

fgarcia25 said:
That is correct sgt. slaughter. If you get close to the tower, I would love to know the speedtest on that. Has to be crazy fast.
Click to expand...
Click to collapse
Speedtest is not only dependent on how close you are the to TX...
For instance, if you have a good signal, try a speedtest with different local servers. I have seen differences as high as 5mbps just switching speedtest servers, as there must be different bandwidths available.

fgarcia25 said:
That is correct sgt. slaughter. If you get close to the tower, I would love to know the speedtest on that. Has to be crazy fast.
Click to expand...
Click to collapse
I've been within 50 yards of one, and still could not get above 10Mbps.
swyped from my gingerbread'd Evo 4G

tomh1979 said:
I've been within 50 yards of one, and still could not get above 10Mbps.
swyped from my gingerbread'd Evo 4G
Click to expand...
Click to collapse
i thought to close was also bad too... ? or am i wrong here

elegantai said:
I was wondering if someone familiar with what the clear wimax towers look like could tell me if this was one of them, or something else. The photo below was taken at a dept. of public works building, so I was not sure if it could be something used for radio communication instead. I didn't want to get all hyped up if it was something like that.
Thanks
Ive never installed Wimax, but Ive worked and installed ants. on many Sprint towers. This doesn't even look like the technology they use, even though that varies in different markets. First clue is no Microwave ant., but I may be wrong.
Click to expand...
Click to collapse

From what I understand this is what the "towers" look like. They are just little boxes.
Sent from your favorite carrier, black and yellow!

DirtyShroomz said:
From what I understand this is what the "towers" look like. They are just little boxes.
Sent from your favorite carrier, black and yellow!
Click to expand...
Click to collapse
Now that looks more like it... small radio cabs mounted close to the ants. Very similar to Tmo's 3g layout.

the ones looks like light bars is a antenna of access point to send wi-fi 2 miles around thats I know there is some pleases they have free wi-fi

That looks like it's for public service radio. (IE. Police, Fire Medical)
Especially hearing it's near a civil building, I wouldn't doubt it.

Tree antenna
huh, i saw one of these. They installed one in 6 days, after the finished they put fake tree stuff on the attenna's. They made the pole out of a wood-like material.
next time i go by it ill take a pic with my evervolv evo

kasey348 said:
the ones looks like light bars is a antenna of access point to send wi-fi 2 miles around thats I know there is some pleases they have free wi-fi
Click to expand...
Click to collapse
Dude, seriously, wtf are you talking about...?

Korean Galaxy S II has NFC!!! *pics*

Just got my hand on a Korean Samsung Galaxy S II. Found a NFC option under Setting menu. Then i removed the back cover, and found the NFC logo on the battery??!!? Could it be the battery is where the NFC tag is at?
Pics:
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Phone manufactured date: 2011-04-26
Image took with my old Nexus One.
What do you guys think?

Interesting
This is super interesting! From your pics I see that the phone has 4 connector pins, how many does the battery have? How many does the Indian battery have? I am inclined to believe this is the mystery behind "Optional NFC".

It would be interesting to see some side on shots compared to a standard SGS II - I hear the NFC version is somewhat thicker?

AFAIK, the KOREAN SGS2 had NFC since launch. lol

sd card slots not in the same place either

An NFC-chip inside the battery would actually make sense. It has a large surface area inside the phone, which would make the NFC handling easier.
However, the design is completly different. On the non-NFC GS2, the microSD cardslot is on the left side and the battery connectors are on the right side. Some small differences with the SIMcardslot and the external antenna connector too. So it seems its more than just the battery.

What are the specs on this version? Do they use the AT&T US frequencies?

Just a quick question: Have you checked 3G bands on the phone?
I heard that the Korean version is NOT quad-band, and am just wondering if you could check that.
Thanks.

I mentioned this a while ago.
http://forum.xda-developers.com/showthread.php?p=13760704#post13760704
It's my understanding that the phone extends the NFC antenna onto the battery so signals don't get blocked by the battery.
It's tri-band only. Don't know why they'd do that though.

bmstrong said:
What are the specs on this version? Do they use the AT&T US frequencies?
Click to expand...
Click to collapse
I think this version is quad-band GSM and quad-band UMTS. Not sure, I dont have the box with me. Will test this with AT&T in the states when i get back there next month.
kohiiou said:
Just a quick question: Have you checked 3G bands on the phone?
I heard that the Korean version is NOT quad-band, and am just wondering if you could check that.
Thanks.
Click to expand...
Click to collapse
I'm unable to use the 3G since i dont have phone service on this SGS2, im just using it on wifi at the moment.
Sticks02 said:
I mentioned this a while ago.
http://forum.xda-developers.com/showthread.php?p=13760704#post13760704
It's my understanding that the phone extends the NFC antenna onto the battery so signals don't get blocked by the battery.
It's tri-band only. Don't know why they'd do that though.
Click to expand...
Click to collapse
How do you check to see if it's tri-band or quad-band GSM/UMTS?

can you pls dump the stock ROM u have in that SGS2 ? it might be useful... i dont know in what way, but may be yes or may be no...
just curious.... from that pic its quite clear that the battery has the NFC chip built in to the SGS2..... thats amazing...
thats why samsung has maded such a thin plastic backcover... i guess so.... nice thinking & it is an indirect clue i am almost sure....
what do u guys think ???

Was on one of the Korean Samsung Spec pages. Lost the link. Although I don't see why they'd make the international version quad band and the domestic version tri band, makes no sense. There's a number code you can enter to check the phone's settings/hardware. It didn't seem to work for me though.
BTW how did you manage to get the phone? It's my understanding you can't buy it outright here unless you're on a visa. Unless you're on a visa...
@manuvaidya:
They've been dumped already. They were dumped a few days after the phone was released. Seems like it's just not that interesting to devs here.
http://forum.xda-developers.com/showthread.php?t=1068307

manuvaidya said:
can you pls dump the stock ROM u have in that SGS2 ? it might be useful... i dont know in what way, but may be yes or may be no...
just curious.... from that pic its quite clear that the battery has the NFC chip built in to the SGS2..... thats amazing...
thats why samsung has maded such a thin plastic backcover... i guess so.... nice thinking & it is an indirect clue i am almost sure....
what do u guys think ???
Click to expand...
Click to collapse
I hope so, we can just purchase the battery and/or sim if both are needed and we get NFC.
I guess NFC in the future release might mean it comes with a NFC enabled battery.

I found a basic side-by-side comparison of the Korean and Internation models:
hxxp://u23dom.blogspot.com/2011/04/galaxy-s2_29.html
Hit up Google Translate for a .. er .. translation.

Ad-sales said:
This is super interesting! From your pics I see that the phone has 4 connector pins, how many does the battery have? How many does the Indian battery have? I am inclined to believe this is the mystery behind "Optional NFC".
Click to expand...
Click to collapse
The UK release phone also has 4 connectors pins and the UK battery also has 4 connectors.
chalid said:
An NFC-chip inside the battery would actually make sense. It has a large surface area inside the phone, which would make the NFC handling easier.
However, the design is completly different. On the non-NFC GS2, the microSD cardslot is on the left side and the battery connectors are on the right side. Some small differences with the SIMcardslot and the external antenna connector too. So it seems its more than just the battery.
Click to expand...
Click to collapse
I have the same battery that is labeled "Near Field Communication" and no, unfortunately it does not enable NFC on a stock UK phone running KE7.
Also, did anyone notice that the connector pins on the Korean SGSII are on the left side vs ours which is on the right?

Sleepycat3 said:
The UK release phone also has 4 connectors pins and the UK battery also has 4 connectors.
I have the same battery that is labeled "Near Field Communication" and no, unfortunately it does not enable NFC on a stock UK phone running KE7.
Also, did anyone notice that the connector pins on the Korean SGSII are on the left side vs ours which is on the right?
Click to expand...
Click to collapse
I think it's like that because the Korean SGS2 has an antenna on the right side to watch TV-over-the-air.

llBlackenedll said:
It would be interesting to see some side on shots compared to a standard SGS II - I hear the NFC version is somewhat thicker?
Click to expand...
Click to collapse
Extra thickness is probably from the DMB tuner
All korean phones come with DMB tuners.
jealous+++++++++

what is the software version of this device?

Dang, I was thinking of getting a spare battery from Korea.

Do both batteries work with uk version of the phone?
Sent from my GT-I9100 using XDA App

Note 7 first to include 4x4 mimo

This is a very pleasant surprise if true!
"20MHz markets would go from 150 Mbps to 300 Mbps. If the Note 7 also has 256 QAM, then add another 33% for about 400 Mbps peak speeds."
Click to expand...
Click to collapse
http://www.androidauthority.com/samsung-galaxy-note-7-4x4-mimo-709040/
Sent from my SM-G935T using Tapatalk

Towers won't provide that in the US but I'll take the extra signal reliability any day
Sent from my SM-N920T using Tapatalk

Is the MIMO for cellular only or for Wifi too? The Note 7 is Wifi AC so I am expected really good wifi speeds.

arcanexvi said:
Towers won't provide that in the US but I'll take the extra signal reliability any day
Sent from my SM-N920T using Tapatalk
Click to expand...
Click to collapse
Supposedly Tmobile is going to start using it sometime this year.
Sent from my SM-G935T using Tapatalk

busab said:
Supposedly Tmobile is going to start using it sometime this year.
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I know they're going to use it. I'm saying that we won't be pulling anywhere near 3-400
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I hope at the very least signal will get better

Will this mean a stronger data signal in buildings or further distance from towers?

I did ELI5 in another post, but I'll drop it in here as well.
Original post is actually here: https://www.reddit.com/r/tmobile/comments/4wtsdy/galaxy_note_7_the_first_4x4_mimo_capable/
- Up until now, all LTE smartphones had 2 Receive antennas in order to match the amount of Transmit antennas at the cell site, which sends up to two independent "spatial streams" in each transmission. In other words, when your signal is good, your phone is able to receive and demodulate both of those streams which provides faster download speeds.
- Over the past several years, T-Mobile begun equipping their LTE cell sites with 4 Transmit (and receive) antennas, which added additional diversity. Think of it as an additional set of "ears" at the cell site, able to "hear" your phone better since our phones transmit power is many times lower than Tx power at the cell site.
- Even though T-Mobile still sends out two spatial streams from the cell site, additional diversity allows operators to transmit data more efficiently, and essentially prepared operators like T-Mobile for the next step, 4x4 MIMO. This also helps with things like VoLTE, as the added antenna diversity improves overall signal resilience.
- In the meantime, there's been an ongoing struggle for OEMs to figure out how to implement 4 LTE Receive antennas in such a small smartphone form factor, and achieve acceptable antenna separation and isolation, and mitigate the interference. At the same time, in order to achieve the highest efficiency gain, signals that are coming into such a small device have to be uncorrelated, leveraging fading and multipath. I won't dive into that today.
- So adding 4 Receive antennas in the smartphone, just like T-Mobile has done at the cell sites, Samsung is effectively adding a set of "ears" and creating that same diversity on the user's end, which benefits not only users, but also operators as they're now delivering data more efficiently, especially to devices that happened to be in poor signal conditions.
- The best part happens when both the operator has 4 Transmit and the smartphone has the matching 4 Receive antennas. When that happens an operator can roll out 4x4 MIMO (Multiple Input Multiple Output) LTE feature, which effectively doubles download speeds, assuming good signal conditions, on top of improved resiliency when in sub-optimal signal conditions.
- So in T-Mobile's or Verizon's case, they typically have 20MHz Band 4 spectrum deployed for their LTE. In the existing 2x2 MIMO use case that yields up to 150Mbps peak downlink data rates, in good signal conditions.
But once they activate 4x4 MIMO, speeds double up to 300Mbps out of the same 20MHz Band spectrum, without operators deploying additional spectrum resources.
- Even in less the optimal signal conditions, in places where you'd see 5Mbps speeds, we should be able to see improved speeds because our phones now have more antennas and are able to maintain that connectivity with the cell site.
It's easy to see that we end up winning on multiple levels now that 4Rx antenna implementation in a smartphone became a reality. I plan on reviewing LTE Performance in Note 7 and other smartphones on my site http://cellularinsights.com so keep an eye on it if interested in this kind of stuff.

Does the Connecticut market have 4x4 Antennas deployed? I think we're a Ericsson market.
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mardukeme said:
Does the Connecticut market have 4x4 Antennas deployed? I think we're a Ericsson market.
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Ericsson is T-Mobile infrastructure vendor in the Northeast region, but 4x4 MIMO equipment will most likely go to sites that carry the most traffic, at least initially.
Regardless, with 4 Receive antennas on Note 7, you still get to benefit from added receive antenna diversity, meaning more stable signal, and improved data rates, especially in less than optimal signal conditions.

Will tmobile be able to use that currently?

Ifixit did a tear down video can anyone tell if it has 4 if it has the necessary antennas for 4x4 mimo.
https://www.ifixit.com/Teardown/Samsung+Galaxy+Note7+Teardown/66389
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mardukeme said:
Ifixit did a tear down video can anyone tell if it has 4 if it has the necessary antennas for 4x4 mimo.
https://www.ifixit.com/Teardown/Samsung+Galaxy+Note7+Teardown/66389
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They didn't tear it down far enough to see the antenna connections; there was still quite a bit of circuitry on the other side of the metal internal frame, so getting to it would require destroying the screen.

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This is the best I have ever gotten on T-Mobile. Not sure if this helps confirm but I'm a happy camper.
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randyspants said:
This is the best I have ever gotten on T-Mobile. Not sure if this helps confirm but I'm a happy camper.
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lucky you. I'd be lucky if I get even 5MB download
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