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[Resolved] [Signal/ Connection] Problem with latest firmware using TD-LTE

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john23jay PHL Level 2 | All posts
Hi guys,

I noticed in the latest firmware 13.20.10.137-20161108 that TD-LTE has no data connection. In the previous firmware I have used which is dated around July or August firmware, it is working fine.

The place where I live only broadcasts 2 bands of LTE, one band for each wireless carrier.
1. TD-LTE band 41 (2500 MHz) for my SIM1.
2. FDD-LTE band 1 (2100 MHz) for my SIM2.

Upon updating my firmware, I could no longer browse internet even if data is active for SIM1. This is only happening while I'm connected to band 41.

I talked to my SIM1 carrier but they said there were no network issues in that location. If so, then there would be an outage of home broadband in the area and many will experience the same problem.
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TWN Moderator | All posts
Hi john23jay,

Are you saying there is no 4G icon on your phone?

Is 3G working fine for sim 1?

Could you take a screenshot of status?(settings>about>status)

thanks
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IND Level 2 | All posts
Last edited by Zen3bala on 2016/11/24 11:32
FYJ_ASUS posted on 2016/11/24 08:48
Hi john23jay,

Are you saying there is no 4G icon on your phone?

Hi,

I am using Airtel 4G in sim1. I am not getting 4G icon !! It's showing either H or H+ only !! When i check with my samsung device it's showing 4G for the same sim in same locality!! Eventhough I checked with my operator they stating there's no problem from their end !! Why i'm not getting 4G in asus zenfone3 Model Z017DB ?? What's wrong ?? What i have todo ??
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john23jay PHL Level 2 | All posts
Last edited by john23jay on 2016/11/24 14:29

Hello FJY,

No, it has 4G icon when I activate mobile data. And yes, 3G has no issue for both SIM slots.

It has no data activity when enabling mobile data. I tried to open apps that require internet like Chrome browser but it does not load up anything. I highly suspect this is due to the firmware having issues with TD-LTE.

For your request, I made sure that I am on the same spot when I took these screenshots.

1. I have LTE signal but I have disabled mobile data so it is idle. When idle, signal strength ranges between -80 dbm to -95 dbm.
Screenshot_20161124-131536.png
2. When I switch on data connection, 4G icon shows up.
Screenshot_20161124-131611.png

3. A few seconds later after mobile data is enabled, you'll notice the signal strength gradually weakens.

Screenshot_20161124-131615.png Screenshot_20161124-131619.png Screenshot_20161124-131712.png

4. And finally drops down to 3G HSPA+
Screenshot_20161124-131743.png

I have tried my brother's phone (Alcatel Flash Plus 2 and Xperia XA Ultra) which supports TD-LTE band 41 and inserted my SIM there and it works fine. Signal strength is the same around -80 dbm to -95 dbm but both his phones does not weaken signal then drop to 3G when mobile data has been activated.

Interestingly, I am able to use mobile data when I am at work. Signal there is FDD-LTE band 3 (1800 MHz) and no problems with that. So I guess, it's the firmware having issues with TD-LTE.


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john23jay PHL Level 2 | All posts
By the way, the previous firmware I used is WW-13.16.5.44 then I updated a couple of times via system update setting to reach WW-13.20.10.137

In the WW-13.16.5.44, I am able to use mobile data while connected at TD-LTE band 41 in the same area. I am even getting download speeds of 46Mbps. Then just last week, I have updated to the latest version WW-13.20.10.137 and I am no longer able to do mobile data using TD-LTE band 41.

So I can't really tell in which firmware version the issue have started.
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john23jay PHL Level 2 | All posts
Any news if this bug is recognized and will be fixed in the next firmware update?
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IDN Level 1 | All posts
call *#*#4636#*#* device information and change to LTE/GSM fix my problem.
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john23jay PHL Level 2 | All posts
henryniron posted on 2016/11/28 04:07
call *#*#4636#*#* device information and change to LTE/GSM fix my problem.

Mine is already set to "LTE/GSM auto (PRL)". It does not fix the issue :-/
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john23jay PHL Level 2 | All posts
Apparently, this issue is limited to SIM1 only. I replaced my SIM card from SIM1 to SIM2 and I am able to connect to TD-LTE band 41 while on SIM2.

I have confirmed this after reading this thread:
https://www.asus.com/zentalk/ph/thread-119107-1-1.html

But it should work on both SIM slots as it did in the previous firmware versions... :/
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PHL Level 1 | All posts
This problem excactly like mine..i posted a tread like this.. Please fix this issue.. I thought all ze520kl model having this issue..
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