Database Info

How many data channels does a cell tower provide?

I am trying to find out if there is a limit on how many phones can establish a data connection to the same cell tower at the same time.
Here is why: 4 users in the same room on Cingular's network. Two can connect to Edge network and get service and two can't. Sometimes all have Edge and sometimes only one. It seems random. The office complex where this happens is full of other people also having cell phones, not all the same provider but probably many also use Cingular... we don't necessarily have that much choice ;-)... The office also happens to be near a very busy shopping mall.
I've been doing some reading about the channels (on HowStuffWorks) and it talks about a certain amount of channels being available. So I figure the reason why sometimes some of us lose connectivity is due to the tower being overloaded - too many people accessing the tower at the same time.
Does anyone have some data on how this all works, or where I can go to find out about it? Does someone work with this stuff, like putting up towers for one of these cell phone companies, who has experience with this? I think it would be of interest to others, too.
Sadly Cingular isn't much help... "Maybe you sweat too much and got your phone wet and that's why..." can you believe he actually suggested that? We even had Cingular replace one phone which was particularly prone to this phenomena, only to find that it didn't change.
Food for thought....

[Q] Great signal but terrible performance

I work in a midtown Manhattan hi-rise near Rockefeller Center and get full signal bars on any phone in and around the office.
The problem is I get terrible performance. Voice calls are garbled and drop, and sometimes callers go straight to voice mail. E-mail, data and web work sporadically and load slowly if at all. The phone will actually get hot just sitting on the desk as if its CPU or transmitter is locked at 100%, and the battery drains quickly.
It's the same whether it's an iPhone, Android or Symbian smart phone or just simple dumb phone, and other people in my office have the same issues. I even notice the same kinds of things happening out on the street up to maybe a block away, but it seems to be at its worst when I'm in the building. But two blocks away, walking through Times Square or other busy places, everything is OK.
Any idea what could be going on and if there's any way to get around it? This is on AT&T.

Change baseband?

I think it's the fault of AT & T

AT&T is a terrible company

+1 on the AT&T being crap

I tried changing baseband but it didn't help, plus like I said it happens on all different kinds of phones. I've also tried manually switching from 850MHz over to 1900MHz band but that didn't help.
Updating my kernel might have actually helped a bit. It's hard to tell though, because the problem comes and goes.
I'm wondering if the signals are too strong and overloading the phone. Or maybe I'm exactly halfway between two strong towers in this building and they're interfering with each other, is that plausible? This is in the heart of NYC after all, AT&T must have a lot of towers in a very concentrated area around here.
Samsung Captivate i897
Serendipity 6.4
Baseband I9000UGKC1
Speedmod Kernel i897-13E-500MHz

I had a similar problem in my area once, it was rectified by the Network Provider.
Its due the GSM inter cell inheritence. Are you located very near to a Mobile Antenna tower.
It would be worth checking your own office building terrace for same

watt9493 said:
+1 on the AT&T being crap
Click to expand...
Click to collapse
i've had nothing but trouble with them in the past

Teampokerface
Heres how you fix the issue. I had a friend with the same issue. 1. open the window of your skyrise 2. take phone are throw it out the window 3. take elevator down to lower level. 4. Find nearest Verizon or Tmobile or sprint store and port your number. 5. take new phone from new network to your skyrise. 6. Congrats your problem has been solved. ANYONE WHO HAS AT&T NEEDS TO GIVE THEM THE FINGER AND MOVE TO ANOTHER CARRIER.

Thanks but if I wanted to hear people say AT&T sucks I would have posted this to Yahoo or something. I get a much better rate with AT&T through my company's FAN account, and I'd rather not pay double to another carrier if this is a technical issue that can be addressed.
For now I can use wifi around the office and put up with the spotty voice coverage, but I was hoping I might find some helpful technical advice here since this is supposed to be a developers forum with presumably mature users.
rathore4u - I'll see if I can find someone at my provider's tech support who understands the GSM inter cell inheritence issue you suggested. Thanks.

[Q] Is my GPS chip defective ?

Hello,
I'm encountering some issues with my Samsung Nexus S GPS. I got the i9023 (Europe/SLCD) version of the phone, which is running default rom (stock), freshly updated to 2.3.4 (via official OTA!).
I couldn't figure why, when using Maps, my position would usually be around 1 km away from where I am. I found out later, this time using Navigation, that it is desperately searching for a GPS signal, that it can't find. Sometimes I manage to get a lock, when I keep it running for like 30 - 40 mins, but it immediately disappears. GPS Statuts keeps showing 0/5 sats.
I was convinced that my GPS chip was defective.
But today, I was hanging out in the city and tried running Navigation. I got a lock, for the first time, within a 15 sec delay. That was the first time that I managed to get live GPS tracking. I've walked a bit around, and the tracking was really, really accurate.
Back home, in my apartment, again I can't get any signal. I live in the 3rd floor, walls aren't that thick and, as for an anecdote, in the same room, my iPhone 3Gs instantly finds my position.
I've bought this phone 6 days ago and therefore still under warranty. Question is, can we say my GPS chip is defective ? Is it worth requesting a replacement ?
Thanks !

1st) You cannot expect to get gps reception inside even with professional equipment. When your iPhone gets a fast fix it's most likely WLAN triangulation. As Apple uses a different database than Google, it may work on on your iPhone and not on your Nexus for a paticular place and vice versa.
2nd) It's unlikely that your gps is broken if you can connect to GSM/UMTS/CDMA2000 networks as gps is processed using the same chipset.
3rd) That 1km-off-fix might be celltower based location, 1km sounds quite plausible.
4th) Try _NOT_ to move until you get GPS fix.
5th) Keep internet access while trying to get a fix. The Nexus S as most phones on the market use assisted gps, where your phone contacts a server that provides data which enables your phone to track its position more easily.
6th) Good luck.

Yes, well, I had 2 friends which came to my place, in my room, and just activated GPS on their iphones and it located them straight away, to our exact position. So it was definitely the GPS tracking and not triangulation.
Indeed, when MY phone locates me off 1 km, this is definitely triangulation or cell-towers.
Of course, when I try to get a fix in my apartment or on my balcony, I just put it on a table and must wait for at least 30 mins to get a lock, and it disappears quickly. Doesn't seem normal to me ...
Finally to answer your 5th point, I got 3G, so a perfect fast & smooth inet connection.

GPS testing should always be done outside, you are not supposed to use it indoors.
What is probably happening there is that the other devices are more sensitive and can still get a lock. You might be able to get a lock if you place your phone very close to the window.
I got a Nexus S recently and noticed that the GPS is quite weaker than the one on my old HTC.
Although the Nexus is faster to get a lock (if you let it use 3G) the GPS itself is less sensitive and accurate.
It looses signal easier, for instance, if i go under some trees, and it takes more time to get signal back after loosing it, for example, if you go under a bridge, the old HTC would get the lock back in 2 seconds after leaving the bridge, the Nexus took half a minute.
Having said that, i think it's good enough for driving navigation, i have done some tests and on the road it behaves well enough.
You shouldn't be surprised, this phone is very similar to the Galaxy S and that had terrible GPS issues, this nexus is better, but still weak.

Thank you for your feedback, temp9300 !
I guess the Nexus S can't compete with iphone's. But it's ok, as long as it works fine outdoors, this is what matters.

satellite internet phone?

going to be traveling the mountain side of japan in the upcoming months, there will be no cell reception, and spotty electricity. i have a portable solar charger, which ill use for my camera, and phone. however ill have no cell reception, whatsoever, so im interested in finding a satellite phone, so that i can get reception. ideally, one that has internet, does such a thing exist? ive never heard of one, can anyone tell me anything they know on the topic? thanks

slow down the replies guys, i can only read so fast

Search for Thuruya and Iridium.
Both support Data-Connections with thuruya beeing a bit cheaper.
The avaible phones for these networks are not made for internet usage but can be used as Modems to connect to your laptop and some even BT tether to other Smartphones.
Be warned though: Satellite Phone rates are really steep. And Data is really slow, too. Think 9.6kbps

Choosing/blacklisting cell towers

I’m not sure this is the place to ask or if someone who knows the board better can move this.
I’m using cell phones as rural internet because there’s nothing here other than signing a 2-year contract and using satellite internet, and there’s a fiber-optic project supposedly under a year away.
I recently got moved (Straight Talk) from AT&T towers to T-Mobile. Uptime is around 30%, and after observing and trying to use for a week or so I figured out: Some towers work, some don’t. I can see a signal strength in “about phone” around -115 dbm when there’s no internet, that’s more like -92 when it works. I can fairly reliably get on a working tower for a couple minutes by:
Go into Airplane Mode (Android 5.02) for a minute, turning the radio off, then back on. Turn the wifi hotspot back on. On the computer drop and reestablish the connections to the phone’s AP (ifdown, wait, ifup), ping something to test. Slightly cumbersome and it switches back fairly soon. Sometimes minutes, sometimes hours. How busy the phone system is may affect this.
This particular phone is rooted so I could edit some text files if I knew which. I don’t know if the weak signal tower doesn’t work just because of the weak signal or if it’s located someplace without internet. If I could choose a preferred tower, or blacklist the bad one, or set the minimum acceptable signal to like -100 dbm, those would all work. There are probably apps for this. Or maybe it’s control the phone companies don’t want you to have.

ab1jx said:
I’m not sure this is the place to ask or if someone who knows the board better can move this.
I’m using cell phones as rural internet because there’s nothing here other than signing a 2-year contract and using satellite internet, and there’s a fiber-optic project supposedly under a year away.
I recently got moved (Straight Talk) from AT&T towers to T-Mobile. Uptime is around 30%, and after observing and trying to use for a week or so I figured out: Some towers work, some don’t. I can see a signal strength in “about phone” around -115 dbm when there’s no internet, that’s more like -92 when it works. I can fairly reliably get on a working tower for a couple minutes by:
Go into Airplane Mode for a minute, turning the radio off, then back on. Turn the wifi hotspot back on. On the computer drop and reestablish the connections to the phone’s AP (ifdown, wait, ifup), ping something to test. Slightly cumbersome and it switches back fairly soon. Sometimes minutes, sometimes hours. How busy the phone system is may affect this.
This particular phone is rooted so I could edit some text files if I knew which. I don’t know if the weak signal tower doesn’t work just because of the weak signal or if it’s located someplace without internet. If I could choose a preferred tower, or blacklist the bad one, or set the minimum acceptable signal to like -100 dbm, those would all work. There are probably apps for this. Or maybe it’s control the phone companies don’t want you to have.
Click to expand...
Click to collapse
It may be possible to exclude certain towers, but for all intents and purposes, it is not possible to include/select/lock-in specific towers. Here is why, if the tools and methods to do so were readily available, then, inevitably more people would use those tools and methods. The more people were to use those tools/methods, the more unstable the whole network would become because the system would not be able to shift the load between towers to equalize/stabilize the network as a whole.
This is because the system works by balancing load, sometimes a signal can be weaker than another but, at the same time, also be faster than other. Stronger signal does not always equal faster speeds.
The concept would be similar to having more than one router/wifi signal at home, then, having everyone in the house and any/all neighbors that are in range, all connected to the same signal/router. The signal they are all connected to would be slow and unstable, the system must have the ability to "bounce" everyone around between all of the routers in order to keep performance at optimum levels "across the board". If everyone is "locked" to the one signal/router, the system can't manage itself, which leads to degradation.
Poor signal in rural areas can be expected, there isn't much you can do about it. The towers are positioned to provide coverage to as many customers as possible from their location. Also, some of the issue in rural areas is a "line of sight" thing. The lay of the land can be a hindrance to signal.
I also live in a rural area of a rural town. I get crappy signal when using cellular network, more down time than up time. I deal with having a decent(but still slow) signal for 1-2 minutes and then when the phone's system runs the next wifi/cellular data re-scan to search for better signal, everything stalls as if I'm getting no signal and it doesn't resume until it either keeps the connection it already has or it just drops out completely for 5-8 minutes until the next time the re-scan can find a signal to connect to. Then the cycle starts over with decent signal for 1-2 minutes or so, until the next re-scan, anyway. I have to turn of mobile data when at home because the virtually continuous re-scanning drains the battery and the device runs warmer than it should normally.
Sent from my SM-S767VL using Tapatalk

OK, thanks. Line of sight - I'm at 1600 Feet elevation, people driving by stop to use the cell service before they go back into the next valley.
I've been with Straight Talk since 2015, originally using AT&T towers, I think we used 13 GB of data last month. AT&T worked very well, I'd say faster than satellite internet. Verizon is also an option.
A weak signal isn't the same weakness for everyone, some people will actually be closer to it. And the population density isn't very high around here. Lat 42.65, lon -72.83. I pay about $60/month for "unlimited data", some fraction of that must end up going to T-Mobile. If the county weren't going to be getting fiber optic networking soon I'd expect the money might go into building out cell systems to handle the load. There seems to be no scaling back and limiting everyone to some number of KB/sec, with that number decreasing as more people use it. My data's either in service or it isn't. -115 dbm is weak by everything I've seen.
I also have a Huawei E3372 modem I can put my SIM into. I bought a pair of small gain external antennas with 3 meter cords. I'd need to get those up high and run something like a Raspberry Pi as a router.

ab1jx said:
OK, thanks. Line of sight - I'm at 1600 Feet elevation, people driving by stop to use the cell service before they go back into the next valley.
I've been with Straight Talk since 2015, originally using AT&T towers, I think we used 13 GB of data last month. AT&T worked very well, I'd say faster than satellite internet. Verizon is also an option.
A weak signal isn't the same weakness for everyone, some people will actually be closer to it. And the population density isn't very high around here. Lat 42.65, lon -72.83. I pay about $60/month for "unlimited data", some fraction of that must end up going to T-Mobile. If the county weren't going to be getting fiber optic networking soon I'd expect the money might go into building out cell systems to handle the load. There seems to be no scaling back and limiting everyone to some number of KB/sec, with that number decreasing as more people use it. My data's either in service or it isn't. -115 dbm is weak by everything I've seen.
I also have a Huawei E3372 modem I can put my SIM into. I bought a pair of small gain external antennas with 3 meter cords. I'd need to get those up high and run something like a Raspberry Pi as a router.
Click to expand...
Click to collapse
I am on Straight Talk also, but I'm on the Verizon side. In my opinion, the Verizon side is little better and has somewhat better coverage than the T-Mobile, Sprint or AT&T side. Other than when at home, I get perfect signal strength, the only reason I get crappy signal is I'm one of the ones dealing with line of sight. I'm several miles outside of town in a low-lying area between two hills.
Sent from my SM-S767VL using Tapatalk

I should try Verizon. They're the default for landlines here but I got the impression they only did contract phones. I have 3 working Motorola XT1527s plus my modem, not interested in some contract phone. This T-mobile experience is my first other than AT&T. There's a website where you can download APK files to sideload, that runs through T-Mobile last I knew.
I think I've figured out how to talk to a human at Straight Talk. Call during east coast business hours, and in the 2nd menu mention data issues. The night/weekend people never seem to accomplish anything. They're eager to help bit they're most effective at the bulk of common issues like billing or changing a SIM. Took me over 10 phone calls last time to get anywhere.