Hello,
I recently bought a Xiaomi Mi A3, and experienced a really unstable/slow connection on Wifi. I'm using the 5GHz network from my router, and it happens even when I'm right next to it, so it's not a problem coming from the router itself. I tried to search similar issues on Google, and found some for the A1/A2, saying it was when the location was turned on. I then turned the location off, and the connection became way more stable and faster. However, this is only a workaround, and I'd like to be able to turn location on without losing my wifi connection. Is there any fixes to it. For example, if I root my phone, and change the ROM, will this become better, or is it a hardware problem?
The problem of slow wifi occurs when bluetooth and localization are active at the same time, disabling one of the two speeds returns to normal.
I have Bluetooth and location on and my Wi-Fi is on par with other devices. Turning off Bluetooth and location gives the same numbers.
Have you tested other devices with Wi-Fi? Try changing Wi-Fi channel in your router.
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Changing the channel, the result does not change, the wifi is slow in both 2.4 Ghz and 5 Ghz with other devices the problem does not occur. I have Stock ROM Android 9 build Number PKQ1.190416.001.V10.3.12.0.PFQEUXM, also the previous version V10.3.7.0.PFQEUXM_20190814 had the same problem.
Same problem here. It's the only issue that I have when I use this phone.
barth2 said:
I have Bluetooth and location on and my Wi-Fi is on par with other devices. Turning off Bluetooth and location gives the same numbers.
Have you tested other devices with Wi-Fi? Try changing Wi-Fi channel in your router.View attachment 4884665
Click to expand...
Click to collapse
Which version of Android you have and which build ? Europe or global?
Thanks
Mi A3 has one antenna shared between wifi and bluetooth radios (not sure about gps and cellular, but I counted only 1 antenna when was watching A3 disassembly video). So when BT is on and does device scanning, or already paired with some device and does data transfer (like playing music), wifi speed will suffer. Wifi scanning itself can cause speed/latency drops, You can alleviate this a bit by disabling Wifi and Bluetooth scanning in settings.
---------- Post added at 09:16 PM ---------- Previous post was at 09:07 PM ----------
The point is you can probably improve that "congestion" with rooting and/or flashing a custom room, but you'll never get rid of it.
You would need to search for wifi kernel module compile or runtime options (the one used in SD665). An option having something like BTCOEX in its name, like https://wireless.wiki.kernel.org/en/users/drivers/ath9k/btcoex
I just puzzled why some ppl complain that wifi is so bad while others do not. Wonder if EU kernel compiled slightly different.
barth2 said:
I have Bluetooth and location on and my Wi-Fi is on par with other devices. Turning off Bluetooth and location gives the same numbers.
Have you tested other devices with Wi-Fi? Try changing Wi-Fi channel in your router.View attachment 4884665
Click to expand...
Click to collapse
qwertysmerty said:
Mi A3 has one antenna shared between wifi and bluetooth radios (not sure about gps and cellular, but I counted only 1 antenna when was watching A3 disassembly video). So when BT is on and does device scanning, or already paired with some device and does data transfer (like playing music), wifi speed will suffer. Wifi scanning itself can cause speed/latency drops, You can alleviate this a bit by disabling Wifi and Bluetooth scanning in settings.
---------- Post added at 09:16 PM ---------- Previous post was at 09:07 PM ----------
The point is you can probably improve that "congestion" with rooting and/or flashing a custom room, but you'll never get rid of it.
Click to expand...
Click to collapse
In my case, with
Bluetooth ON and Gps OFF wifi speed normal
Bluetooth OFF and Gps ON wifi speed normal
Bluetooth ON, Gps ON, wifi speed is low
barberar said:
In my case, with
Bluetooth ON and Gps OFF wifi speed normal
Bluetooth OFF and Gps ON wifi speed normal
Bluetooth ON, Gps ON, wifi speed is low
Click to expand...
Click to collapse
Yeah, I just ran similar tests with my 5Ghz Wifi. I would not say it's that low, so I would complain. But there is a noticeable ~25% speed drop when BT and GPS are ON, from 200mbps to 150-160mbps in my tests. If either BT or GPS is OFF Wifi throughput stays the same ~200mbps. Also noticed that TCP jitter jumps from 1ms to 15-25ms indicating packet loss and re-transmits.
qwertysmerty said:
Yeah, I just ran similar tests with my 5Ghz Wifi. I would not say it's that low, so I would complain. But there is a noticeable ~25% speed drop when BT and GPS are ON, from 200mbps to 150-160mbps in my tests. If either BT or GPS is OFF Wifi throughput stays the same ~200mbps. Also noticed that TCP jitter jumps from 1ms to 15-25ms indicating packet loss and re-transmits.
Click to expand...
Click to collapse
Which version of Android you have and which build ? Europe or global?
For me (EU rom) when BT and GPS are ON the speed is very low 1-2 mbps, If either BT or GPS is OFF Wifi throughput stays the same ~130mbps.
I have global rom, nov security patch. Wifi on 5ghz 300mbit and 2.4ghz 300mbit. Internet speed 80/5 mbit/s.
With bt off and location on:
2.4ghz - 45/5mbit
5ghz - 80/5mbit
With bt and location on:
2.4ghz - 25/5mbit (upload quite unstable, jumping between 0 and 5 during test)
5ghz - 40/"3" reaches 3mbit/s upload and then disconnects wifi (tried 5 times - same results)
Tests were made with speedtest app with the phone 1m away from router.
Later today i will try with EU rom.
EU ROM
5 ghz WiFi, channel 42, down/up speeds in mb
BT off, location disabled = 33/12
BT on (connected to Mi Band 4), location disabled = 28/12
BT on (connected to Mi Band 4), location enabled (active Sygic)= 26/10
BT on (connected to Mi Band 4), location enabled (no active GPS app)= 28/11
BT off, location active GPS = 34/12
2.4 ghz WiFi, channel 11, down/up speeds in mb
BT off, location disabled = 40/12
BT on (connected to Mi Band 4), location disabled = 39/12
BT on (connected to Mi Band 4), location enabled (active Sygic)= 36/12
BT on (connected to Mi Band 4), location enabled (no active GPS app)= 35/11
BT off, location active GPS = 38/12
Location has minimum/no impact. Low speed active BT connection interferes with WiFi, but it's on the verge of a statistical error.
I used speedtest app, local server would be more suitable to omit the internet connection/target server variance, but for our purpose it should be enough.
Seems that I had problems with the router config also.
First I tried another 5ghz network.
The speed did decrease around 30% with bt and gps ON, but the connection did not interrupt (although it was jumping from 10 to 35mbit/s during testing).
Then I returned home and changed wifi channels and set the bandwith to 40mHz.
The result was the same as the other network. 30% drop in speed, but connection was stable.
Now I flashed EU rom and the difference between gps+bt on and off is minimal. Maybe 10%.
barberar said:
Which version of Android you have and which build ? Europe or global?
For me (EU rom) when BT and GPS are ON the speed is very low 1-2 mbps, If either BT or GPS is OFF Wifi throughput stays the same ~130mbps.
Click to expand...
Click to collapse
Global stock rom. But ppl with EU rom posted their test results above and their results are not that bad. 130 vs 2 mbps is a huge drop, wonder if there is some sort of other interference in your environment.
barberar said:
Which version of Android you have and which build ? Europe or global?
Thanks
Click to expand...
Click to collapse
Stock ROM November security patch EU
qwertysmerty said:
Global stock rom. But ppl with EU rom posted their test results above and their results are not that bad. 130 vs 2 mbps is a huge drop, wonder if there is some sort of other interference in your environment.
Click to expand...
Click to collapse
The strange thing is that with other devices, for example with xiaomi mi4c I have no problem, the speed is about 230 mbps at 5Ghz I have some improvement by setting the router to wpa+wpa2-psk instead of wpa2-psk, 20-27 mbps about a 5 Ghz.
No matter the wifi signal strength I noticed that I always get around 10-15% packet loss during testing with bt+gps ON. When OFF, packet loss is always at 0%.
Ping and jitter don't change between ON and OFF
I tried it with another phone with ROM GLOBAL PFQMIXM 10.3.6.0 and the wifi speed with Bluetooth on and Location on is less than normal, but not slow with the other phone with EEA build, PFQEUXM.10.3.12.0 (1-2 mbps in download)
Here's a SpeedTest, from Global ROM
• Wi-Fi on : Bluetooth off and Location off 218 269 ping 3ms jitter 1ms loss 0
• Wi-Fi on : Bluetooth on and Location off 206 244 3ms 2ms 0
• Wi-Fi on : Bluetooth on and Location on 168 216 4ms 1ms 5%
• Wi-Fi on : Bluetooth off and Location on 217 237 4ms 1ms 0
Tested on Global build, PFQMIXM 10.3.6.0
Should I try to reinstall the phone with build EEA PFQEUXM.10.3.12.0
barth2 said:
I have Bluetooth and location on and my Wi-Fi is on par with other devices. Turning off Bluetooth and location gives the same numbers.
Have you tested other devices with Wi-Fi? Try changing Wi-Fi channel in your router.View attachment 4884665
Click to expand...
Click to collapse
Oops I spoke too soon. There's a huge drop from over 200mbps to less than 100mbps with bt on. My previous test I turned on bt but I didn't have a bt device nearby so there was actually no active connection. So there IS a problem. EU ROM.
Related
Wifi signal on this phone is never more than 1 bar and i could be in same room as router which has a/b/g/n and the signal always cuts out completely
is there any fixes for this ?
Did you try changing the router's settings? Enable only 1 band at a time. Also I would try changing the routers security protocol. Some routers also have a setting for adjusting the transmit power to use. At 10% I had one bar at 12 feet. my htc sensation wouldn't play well with N bandwidth enabled by itself but it was fine with b/g/n.
greeky510 said:
Did you try changing the router's settings? Enable only 1 band at a time. Also I would try changing the routers security protocol. Some routers also have a setting for adjusting the transmit power to use. At 10% I had one bar at 12 feet. my htc sensation wouldn't play well with N bandwidth enabled by itself but it was fine with b/g/n.
Click to expand...
Click to collapse
Thank you for the reply, but I do not always have the right to touch the router - in a cafe for example and even in a office...
any other solutions to the wi-fi problem?
greeky510 said:
Did you try changing the router's settings? Enable only 1 band at a time. Also I would try changing the routers security protocol. Some routers also have a setting for adjusting the transmit power to use. At 10% I had one bar at 12 feet. my htc sensation wouldn't play well with N bandwidth enabled by itself but it was fine with b/g/n.
Click to expand...
Click to collapse
Thankyou greeky510
Now I have full bars
What I did was change router to exclusively G ,I tried N first but only got 1 bar
And signal to frequency 11 from 1
while this fix does work where you can access router this problem will remain for routers outside of the home
my galaxy S 2 doesnt have this problem at all it always gives a good strong signal no matter where as long as wifi is in good range
You are very welcome maniAK. Unfortunately my technical skillset has reached its limit with a phone i have no experience with since i'm still waiting for my Razr Maxx in a few days.
I'm only guessing that the problem is that the rest of the routers you mentioned use either a dandwidth that your phone doesnt play well with or an authentication protocol that it doesnt like. Try turning off LTE, GPS and BlueTooth and see what happens then. Also try holding the phone a "different" way.
I would still go to Verizon and request a replacement phone, just to make sure there is no hardware issue with the phone.
When I had my EVO 4G I had no WIFI issues at home or work. When I got the EVO 3D I had serious issues with WIFI (at home only) and I kept blaming the phone. Well after turning some options off (like turbo boost) and playing with bandwidth settings) EVO 3D became solid.
Now EVO 4G LTE is having WIFI issues. I had started a thread using 2.4Ghz for WIFI which was a huge help. But it's still not quite right. You can see it frequently flipping between WIFI and 3G. The phone again works fine at work. If I have to I'll buy the same wifi routers I have at work.
So I started digging into Router settings again and noticed this "WIFI Coexistence" option (which was set as disabled).
So I researched it on the dd-wrt.com web site (the open source I run on my router and found some interesting info).
I think this may have something to do with some folks issues.
It may also account for why some people say they have no problem and others do.
Even when you swap your phone your Bluetooth devices might choose a different channel when you pair it and have less conflicts. On old WIndows phones even when you unpaired it, it would cache the old channel and use it again if you repaired it.
I'm going try this option and try running with bluetooth off and see if it's more stable.
I have had bluetooth issues as well. Mainly after a call, the would disconnect from headset and headset could not reconnect without toggling bluetooth on the phone or headset (or both).
This is a copy of what I found on dd-wrt.com
==================================
I found a clear answer on TomatoUSB's website:
Bluetooth Coexistence
An 802.11 device and Bluetooth can interfere with each other when the 802.11 device operates on the 2.4 GHz band. All Bluetooth devices operate at the 2.4 GHz band. If you experience wireless disconnects, decreased range or speed, and other connectivity issues when you turn on some of your Bluetooth devices, try to change this option to "Enable" (this will make the router and Bluetooth device to take turns in using the spectrum for communication) or "Preemption" (the router will inform the Bluetooth device about the channel it is operating on, and the Bluetooth device can preemptively disable communication on the respective Bluetooth channels).
Please note that this option requires your Bluetooth device to "cooperate". If the Bluetooth device doesn't implement the coexistence techniques, using this option will have no effect.
I'm 99.99% sure it's bluetooth causes WIFI issues for me.
If your having WIFI issues (which interferes with 3G as well) and you normally keep bluetooth on.
Try as simple experiment leaving bluetooth off (I know you should not have to).
I left mine off today and data was flawless.
Switching between 3G and WIFI was instant and smooth.
When I wake it I see it jumping around between 3G and WIFI.
This phone uses a Qualcomm bluetooth stack and EVO 3D and EVO 4G used broadcomm.
I never even thought to consider bluetooth.
Bluetooth has been bumpier on this phone as well.
If I leave WIFI off, bluetooth runs perfect.
I need more data though to sort this out.
I always leave Bluetooth off when at home, its only on when my phone is in the car dock. But I still couldn't even get through a speed test without wifi disconnecting completely and the test failing.
Ironically, I do not have a single drop out when at work, only at home.
I set Bluetooth Coexistence in my router's settings to Preemptive and so far (5 minutes) so good (I do have other bluetooth devices in the house).
Will report back after further testing.
Oddly, no other devices in my house have ever had this problem, so there is still something funky with the new Evo. But luckily with all these software fixes having varying success with people, it doesn't look like a hardware issue.
Still not a single drop out that I've noticed.
I'll know for sure in the morning. My Titanium Backups to dropbox have failed every.single.night with this phone due to wifi dropping connection in the middle of the upload. We'll see if they complete tonight.
Looking positive.
modplan said:
Still not a single drop out that I've noticed.
I'll know for sure in the morning. My Titanium Backups to dropbox have failed every.single.night with this phone due to wifi dropping connection in the middle of the upload. We'll see if they complete tonight.
Looking positive.
Click to expand...
Click to collapse
Awesome. Thanks for the update.
I agree it's odd this Device is stirring up the issues.
But it could be something as dumb as they scan for available bluetooth channels in a different order and tend to hit channels that conflict with WIFI.
Most WIFI I think is on channel 11. I have mine on channel 11 as it seems teh best compromise for the many WIFI devices I have so I didn't want to change it.
So folks migh thave more flexibilty, and just changing WIFI channel can make quite a change.
I'll have to check work, what channel it's on. I'm pretty sure it's not on channel 11 because we have multiple access points and we wanted teh channel non overlapping. So we have them set at both end of teh range if I recall.
That could be a hint as well.
mswlogo said:
When I had my EVO 4G I had no WIFI issues at home or work. When I got the EVO 3D I had serious issues with WIFI (at home only) and I kept blaming the phone. Well after turning some options off (like turbo boost) and playing with bandwidth settings) EVO 3D became solid.
Now EVO 4G LTE is having WIFI issues. I had started a thread using 2.4Ghz for WIFI which was a huge help. But it's still not quite right. You can see it frequently flipping between WIFI and 3G. The phone again works fine at work. If I have to I'll buy the same wifi routers I have at work.
So I started digging into Router settings again and noticed this "WIFI Coexistence" option (which was set as disabled).
So I researched it on the dd-wrt.com web site (the open source I run on my router and found some interesting info).
I think this may have something to do with some folks issues.
It may also account for why some people say they have no problem and others do.
Even when you swap your phone your Bluetooth devices might choose a different channel when you pair it and have less conflicts. On old WIndows phones even when you unpaired it, it would cache the old channel and use it again if you repaired it.
I'm going try this option and try running with bluetooth off and see if it's more stable.
I have had bluetooth issues as well. Mainly after a call, the would disconnect from headset and headset could not reconnect without toggling bluetooth on the phone or headset (or both).
This is a copy of what I found on dd-wrt.com
==================================
I found a clear answer on TomatoUSB's website:
Bluetooth Coexistence
An 802.11 device and Bluetooth can interfere with each other when the 802.11 device operates on the 2.4 GHz band. All Bluetooth devices operate at the 2.4 GHz band. If you experience wireless disconnects, decreased range or speed, and other connectivity issues when you turn on some of your Bluetooth devices, try to change this option to "Enable" (this will make the router and Bluetooth device to take turns in using the spectrum for communication) or "Preemption" (the router will inform the Bluetooth device about the channel it is operating on, and the Bluetooth device can preemptively disable communication on the respective Bluetooth channels).
Please note that this option requires your Bluetooth device to "cooperate". If the Bluetooth device doesn't implement the coexistence techniques, using this option will have no effect.
Click to expand...
Click to collapse
I think you're onto something... If I leave the house and wifi sticks on, then I normally have to reboot phone before I can connect to wifi again. Simply toggling wifi off and on doesn't work.
So on a whim, I turned off bluetooth. Then turned wifi off and back on, and bam! Connected! Hmmmm....
Now with reference to co-existence, that can't be the "fix" because not everyone has access to their router settings (such as at work, hotels, malls, etc.)
WiFi works perfect Bluetooth on the otherhand, haven't tested. But I'm sure works just as fine
Sent from my EVO using xda premium
Hi,
I've tried disabling WIFI powermode (which I do everytime I reboot), but my wifi seems pretty flaky. Speed is great, but it sometimes disconnects (not THAT often).
I have two APs, both set on same channel / SSIDs etc. Looking at wifi analyzer, it seems like the phone doesn't really handle switching between APs very well.
Is there a kernel or mod that would help with that? Or perhaps a better way to set my APs? (DD-WRT and Tomato, all 2.4G). Should I try the modems or is that just for cell network performance?
Especially annoying when using Talkatone or Skype to phone someone and then it drops in the middle of a call.
Thank you!
Setting to AP's within range of each other to the same frequency is asking for trouble.
Having them both broadcast the same SSID more so.
The kernel handles Wifi-related stuff, modem is only for cell communication.
Wifi has no handover protocol such as 2G/3G/4G does, so you'll stay connected to an AP until you loose the connection and then reconnect through the whole connection protocol (including Handshake, Authentication, DHCP, ...) on the next one. So it's a pretty bad protocol for moving around with a constant data stream.
I was under the impression I HAD to have them use the same SSID since this AP is there to extend the range of my home wifi (as per: dd-wrt WAP website I can't post link to since I'm a noob), I'll try setting them to channels 1&11 see if it gets better...
I had issues at work. But not at home.
Today I told it to forget my B/G radio and to connect to the N radio. No disconnects, none..
No changes made to the phone at all..
Hi,
I try to connect my z2 tablet to 2 different routers which deliver a "300Mbps" signal (150mbps in fact, verified with a PC).
The maximum speed connection is limited to 75mbps on the tablet (which is very close from the router).
We can see : "Wi-Fi 802.11 a/b/g/n/ac, Wi-Fi Direct, dual-band, DLNA, Wi-Fi hotspot" in the specifications, is there something that i don't understand ?
Thanks
berbar38 said:
Hi,
I try to connect my z2 tablet to 2 different routers which deliver a "300Mbps" signal (150mbps in fact, verified with a PC).
The maximum speed connection is limited to 75mbps on the tablet (which is very close from the router).
We can see : "Wi-Fi 802.11 a/b/g/n/ac, Wi-Fi Direct, dual-band, DLNA, Wi-Fi hotspot" in the specifications, is there something that i don't understand ?
Thanks
Click to expand...
Click to collapse
I have the same issue with mine. I haven't tried changing any router channels or settings yet. Using my galaxy s5 and Z2 tablet from the same location I get around 270mbps on the s5 and only 75 on the Z2.
Dual-band means: 2.4 GHz as well as 5Ghz Wifi. (Either / or, not at the same time.)
In any case the Wifi is restricted to 150 mbps.
Go into your router settings and look for a setting called "HT 20/40 Coexistence" and disable it (in dlink routers it's in Advanced > Advanced wireless). This worked for me when I had a similar issue.
degraaff said:
Go into your router settings and look for a setting called "HT 20/40 Coexistence" and disable it (in dlink routers it's in Advanced > Advanced wireless). This worked for me when I had a similar issue.
Click to expand...
Click to collapse
I've tried before and it's not the solution. My wifi network is on the 40mhz frequency and i can have 150 mbps on a pc but still 75mbps on with the z2.
Actually now I just tested my z2 tablet's wifi speed, and it doesn't seem to go above 56 Mb/s (link speed for the connection in wifi settings is rated at 72 Mb/s), on my PC I reach my ISP's advertised 120 Mb/s. Odd stuff.
I found out that the tablet is unable to get above 72mbps link speed on a 2.4 GHz signal. When using a 5 GHz signal, the link speed leaps to 135 mbps (with a floor/ceiling between the access point and tablet). Maybe for some reason the tablet is unable to use the 40 MHz channel with 2.4 GHz?
I have been experiencing problems with my MI A3, I have had inconsistencies in the connection of the Wi-Fi, to any Wi-Fi that I connect, the connection may be bad due to latency, I will attach screenshots with the results. This did not happen to me before, and I checked with other phones the connection with the router and it is normal, it is giving me problems with my phone.
I am in the global stock rom, with the September security patch, to be more precise version V11.0.21.0.QFQMIXM. I used the MIUI 12 port and I have the same problems, why is this?
This greatly affects gaming on the phone, as well as downloads and video calls
After having switched between roms and roms doing more tests regarding the wifi, between roms with stock vendor and oss vendor, I discovered that it is about interference related to the use of the gps while the wifi is active.
The speed of the link with the Wi-Fi is greatly affected by the use of the GPS, while the GPS is completely disabled, the connection to the Wi-Fi is completely normal, the link speed does not vary and the latency or ping is correct
The strange thing is that this did not happen before, about a month ago, I could use the phone normally with the wifi network and the gps activated at the same time and the connection was normal