Hi friends.
Is anybody know how the data transmission (EDGE, UMTS, HSDPA) is working during the voice call?
What is the rule?
I thought it is stopped when the voice call is in progress, but I realised few times that it is still working when the call is started (data & voice at the same time).
What is the key?
Thanks in advance for help in this. Regards!
Sent from my LT26i using XDA
HSPA works on a different frequency, EDGE uses the voice channel. Not sure about UMTS but no one uses it anyway.
2g and edge stop during calls but 3g don't.
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Does the phone always use 2g for calls or does it use3g if it's available?
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Pezo said:
Does the phone always use 2g for calls or does it use3g if it's available?
Sent from the Delta Quadrant using a transwarp conduit.
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Depends on your settings; If you have set it to use WCDMA only all the time, it will look for 3G networks, if it's set to GSM/WCDMA the phone will connect to 3G network if possible, else, use the 2G (GSM ) band.
So if your phone is connected to WCDMA network, you can make calls and be able to use the internet at the same time ( data will not be interrupted ).
However, if for any reason the 3G network drops, the phone will switch to GSM mode and all data tramission will be on hold.
Be aware that 3G drains the battery way faster than GSM; however, during data transmission on 2G networks, your phone will not be able to receive calls since it's a Class B GPRS device, meaning it switches between data and voice automatically, but the two cannot happen at the same time; however, the two are always on.
Some phones ie. Nokia will give priority to phone calls over data packets, downloads will get interrupted if you receive a call; on some other devices ie. iPhone, data packet will never be interrupted unless idle or outgoing call.
3G is shown as H on your screen which is HSPA ( high speed packet access ) and as said will allow both voice and data transmission at the same time.
Related
I don't have a data plan so I don't want my phone always looking for 3G and edge
what would I need to do to disable those and still be able to receive calls and texts or is that even possible?
Sent from my SGH-T959 using XDA App
Anyone?
Sent from my SGH-T959 using XDA App
Go into settings, wireless and network, mobile networks, network mode, gsm only
Gsm only = 2g
Wcdma = 3g
auto = both
Sent from my SXY-T959
kanwal236 said:
Go into settings, wireless and network, mobile networks, network mode, gsm only
Gsm only = 2g
Wcdma = 3g
auto = both
Sent from my SXY-T959
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k done that, and should i check packet data and data roaming?
I use a different method:
Settings-->Wireless and Network-->Mobile Networks-->Access Point Names-->T-Mobile US-->scrol to the bottom where it says APN Type. Change it to MMS.
What this does: It disables 3G and 2G/Edge all the time EXCEPT when your phone is sending or receiving a picture message. In this case, your vibrant will connect to 2G/3G and send/receive the picture message. It will then turn them off again. You do not get charged data for sending picture messages.
Experience: I do not have a data plan either. Have been running my Vibrant for half a year like this.
}{Alienz}{ said:
I use a different method:
Settings-->Wireless and Network-->Mobile Networks-->Access Point Names-->T-Mobile US-->scrol to the bottom where it says APN Type. Change it to MMS.
What this does: It disables 3G and 2G/Edge all the time EXCEPT when your phone is sending or receiving a picture message. In this case, your vibrant will connect to 2G/3G and send/receive the picture message. It will then turn them off again. You do not get charged data for sending picture messages.
Experience: I do not have a data plan either. Have been running my Vibrant for half a year like this.
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i can also recieve phone calls/text with NO delay and stuff?
So using the secret menu, I was trying different methods to see what signal strengths I was getting at my place, same spot. Interesting enough, the signal strength bars are different when using CDMA auto prl (4-bars) and EvDo only (2-bars) mode, even though I still see the 3g icon. Also, it seems the 1x radio is always on in every mode except EvDo only, plus I tried calling using all 5 modes.
Thus far, (1-yes, 0-no) I can make a call in mode:
CDMA auto PRL - 1
CDMA only - 1
EvDo only - 0
CDMA + LTE/EvDo - 1
LTE only - 1
so my question is, why can't I (and is anyone able to) make calls over EvDo only mode? When I place one, it hangs for a sec, and ends automatically saying "Call was lost". I was hoping to get better call quality (even if I can't have 4g speed), cuz right now calls sometimes sound muffled (but clear enough to understand), compared to when I had my nexus one on t-mo. (I tried eHRPD and EvDo-rev.a modes to no avail)
PS I know (atleast I read somewhere) that the T-Bolt cannot support calls over LTE itself, or VoLTE as it's called (unless if that's changed or I am wrong.)
Any thoughts? your experiences? I just want to get ppl's thoughts on this.
So... I guess no answers then?
Well, EvDO-only would not permit any voice calls because you've told the radio to only operate with a data signal. EvDO, or "Evolution-Data Optimized", is the 3G data component of CDMA wireless networks, so without a preferred network mode that includes CDMA you won't have any voice service.
when i had my phone on evdo only (stupidly thinking it was 1x) i couldn't make or receive any calls
evdo handles data, 1x handles calls/sms
squeakyl said:
when i had my phone on evdo only (stupidly thinking it was 1x) i couldn't make or receive any calls
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Right. CDMA = 1x data and voice EVDO = data only. If you force the phone into a data only mode, voice will not function.
From what I've read, it's possible to to disable the high speed connection and leave only EDGE and other slow connection by change network mode to GSM only. However when I tried that on mine, I lost all connections altogether include voice call, and left with "unregistered sim, emergency call only". My carrier is CDMA, so not sure if that has anything with it.
What am I missing here?
Hspa 3g only on gsm system.
For cdma you have 1x and evdo..don't know if you can disable evdo or not. Please see setting/wireless & networks
Sent from my GT-I9100 using Tapatalk
Hi there,
i have a question related to internet speed
In setting there is 3 options for choosing internet data
- 2G only
- 3G only
- automatic
in my countries 2G is horribly slow
When i access to internet i change to ''3G only'' but the signals i receive can be 3G or H, i only want ''H'' signal not 3G because 3G is still slow for normal surfing!!!
how can i change to ''H'' only?
I have been watching for my 3G/H icon in CM7 and it seems Atrix uses 3G only for standby (maybe 3G mode drains less energy), when data starts to transfer it automatically switches to HSDPA mode. So you don't need to change it to HSDPA manually
vietdoan20062006 said:
Hi there,
i have a question related to internet speed
In setting there is 3 options for choosing internet data
- 2G only
- 3G only
- automatic
in my countries 2G is horribly slow
When i access to internet i change to ''3G only'' but the signals i receive can be 3G or H, i only want ''H'' signal not 3G because 3G is still slow for normal surfing!!!
how can i change to ''H'' only?
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Your phone should jump to HSPA if it is available, or else it will use UTMS.
Flash the latest radio. After that I can switch networks as I want.
You can not just change to H. Speed depends of coverage in your area. Phone will use the best and fastest available speed/network. You can force 3G but then with just 2G coverage your phone will be off line.
Zeljko1234 said:
You can not just change to H. Speed depends of coverage in your area. Phone will use the best and fastest available speed/network. You can force 3G but then with just 2G coverage your phone will be off line.
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That's right. I can use just edge and it works just fine. 3g is not the best in my area. You cannot force H. Correct.
Depending on your Rom, when it says 3g, it will be because you're not using data at the time. Then when you're using data it switches to H. I say depending on Rom because for example, I'm running Alien, and it says H all the time.
Sent from my MB860 using Tapatalk 2
Can anyone out there see if they get the same behavior as me?
I'm in a band 12 area, with a 4 bar LTE signal.
Wifi calling is enabled but CELLULAR PREFERRED, I'm connected to the T-Mobile ASUS router on Verizon FiOS (2.4, 5ghz, doesn't matter).
Long press 1 to get into your voicemail. What you expect to hear:
"You have no new messages in your mailbox..." is chopped off and what I hear is:
"mailbox..."
If I turn off wifi, the issue goes away. If I turn off wifi calling, the issue goes away. If I change the wifi calling setting so that it uses wifi preferred or always (so the call is an actual wifi call), the issue goes away. If I force the phone to use HSPA, the issue goes away.
So even though the call isn't a wifi call, something about wifi calling and wifi, even though the call goes through VoLTE, is causing the start of a call be be chopped off.
At this point I have disabled wifi calling on my phone.
amarryat said:
Can anyone out there see if they get the same behavior as me?
I'm in a band 12 area, with a 4 bar LTE signal.
Wifi calling is enabled but CELLULAR PREFERRED, I'm connected to the T-Mobile ASUS router on Verizon FiOS (2.4, 5ghz, doesn't matter).
Long press 1 to get into your voicemail. What you expect to hear:
"You have no new messages in your mailbox..." is chopped off and what I hear is:
"mailbox..."
If I turn off wifi, the issue goes away. If I turn off wifi calling, the issue goes away. If I change the wifi calling setting so that it uses wifi preferred or always (so the call is an actual wifi call), the issue goes away. If I force the phone to use HSPA, the issue goes away.
So even though the call isn't a wifi call, something about wifi calling and wifi, even though the call goes through VoLTE, is causing the start of a call be be chopped off.
At this point I have disabled wifi calling on my phone.
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I have the same set up, I'll turn off WiFi and report back, as I've noticed the same issues...
Generic condescending signature line
---------- Post added at 06:36 PM ---------- Previous post was at 06:30 PM ----------
Seems better... I'll keep it like this and see...
Generic condescending signature line
My theory on what's happening here is this:
While you're telling the system too use VoLTE and setting cellular preferred, it's starting the call on Wi-Fi calling and handing off to VoLTE.
The reasoning it's simple...when on Wi-Fi, cellular data is deactivated. VoLTE depends on cellular data. When you start a call, it establishes it via Wi-Fi calling, and establishes the cellular data connection. Once that connection it's up, handover occurs, but this causes a few seconds of Audio loss because it has to set that back up.
You can see the delay yourself by turning off Wi-Fi, then turn off mobile data. Turn mobile data back on and you'll see the delay between enabling and being reconnected too the LTE network.
Hope this helps explain the issue. It's a handoff delay caused by having to reconnect mobile data and LTE, and you likely wouldn't notice for normal calls, but VM answers immediately.
Sent from my LG-H901 using Tapatalk
toastido said:
My theory on what's happening here is this:
While you're telling the system too use VoLTE and setting cellular preferred, it's starting the call on Wi-Fi calling and handing off to VoLTE.
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I understand what you're saying and thanks for the explanation. And I realize that when wifi is on, data is going through wifi and would have to switch to LTE for a call. So this does make sense to some extent. But.... if wifi is on but wifi calling is not, the calls happen quickly and are not chopped off. But the same holds true - the data is going through wifi and would have to switch to LTE. Your reasoning explains it for wifi calls always and wifi calls never.
amarryat said:
I understand what you're saying and thanks for the explanation. And I realize that when wifi is on, data is going through wifi and would have to switch to LTE for a call. So this does make sense to some extent. But.... if wifi is on but wifi calling is not, the calls happen quickly and are not chopped off. But the same holds true - the data is going through wifi and would have to switch to LTE. Your reasoning explains it for wifi calls always and wifi calls never.
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That's because with wifi calling ON, the call is initially set up through wifi calling, and has to hand over once the mobile data connection is up, LTE is negotiated, and VoLTE is negotiated. If wifi calling is OFF, the call is established via GSM, then (optionally, but not usually) handed over to VoLTE once LTE is up and VoLTE is negotiated.
I've done work in the industry with VoLTE, and my day job involves VoIP, so it's not as simple as one might think. Believe it or not, GSM to VoLTE handoff is much easier than WiFI calling to VoLTE. It still explains it, believe it or not, it's just a matter of which path. It's also harder to hand off from VoLTE to GSM when you roam out of a VoLTE area... which is the primary cause for VoLTE call drops.
toastido said:
Believe it or not, GSM to VoLTE handoff is much easier than WiFI calling to VoLTE.
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Why haven't they implemented that then? That hurts them in the rootmetrics etc. scores where they'd test phone calls.
For example, band 12. You make a VoLTE call, drive to out of range of LTE and the call drops to HSPA or Edge. It nevers goes back to LTE. So when they're doing their tests, if the call switches away from LTE, then they drive to an area that is band 12, when the HSPA signal gets weak, the call gets dropped even though there's a great band 12 signal.
amarryat said:
Why haven't they implemented that then? That hurts them in the rootmetrics etc. scores where they'd test phone calls.
For example, band 12. You make a VoLTE call, drive to out of range of LTE and the call drops to HSPA or Edge. It nevers goes back to LTE. So when they're doing their tests, if the call switches away from LTE, then they drive to an area that is band 12, when the HSPA signal gets weak, the call gets dropped even though there's a great band 12 signal.
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That's actually a great question...and unfortunately one I can't answer or even begin to speculate on...
¯\_(ツ)_/¯
Sent from my LG-H901 using Tapatalk
toastido said:
That's actually a great question...and unfortunately one I can't answer or even begin to speculate on...
¯\_(ツ)_/¯
Sent from my LG-H901 using Tapatalk
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Back to my original point though - what I'm hearing is that this isn't unique to the V10. I'm wondering why this isn't all over the internet where people are noticing that the start of their phone call is missing when wifi calling is enabled but they've set it to cellular preferred (which is NOT the default BTW).