Troubleshooting Carrier Aggregation or 4G+ doesn’t work properly on LTE Advanced Router
This Article Applies to
LTE Advanced Routers, including Archer MR600 and Archer MR500
Problem Description
We have received reports from some of our customers regarding issues with carrier aggregation or 4G+ not functioning correctly after updating to the 1.7.0 firmware on MR600 V2 or on MR600 V3. These issues include 4G+ never working or the 4G+ LED turning on and off every few seconds. While the symptoms may appear similar, the underlying causes could vary. To address these issues, we kindly ask you to follow the instructions in this article to troubleshoot and provide us with detailed information for further analysis.
If you are unfamiliar with carrier aggregation or 4G+, please refer to our guide on What is Carrier Aggregation and how it works on TP-Link LTE Gateway Routers/MiFi?
Troubleshooting Steps
1. Confirm with the ISP which band combinations the SIM card supports, then check if it matches with the LTE Advanced Router. You could check the supported bands and Carrier Aggregation band combinations on the specification page of the product.
Here is Archer MR600 V3 Specification. As you can see, not all combinations are supported, for example, even though it supports 4G band 1 and also band 40, it doesn’t support band 1+band 40 for carrier aggregation.
2. Make sure the band is set to be “Auto” on Advanced->Network->Internet page, then check band information on Advanced->Status page, record the band(s).
Then insert the same SIM card into another LTE Advanced device at the same location and check if it works on 4G+ all the time, if so, check the band as well for comparison.
If you have no other LTE Advanced router, please try your smartphone, and you could refer to How to check the 4G band working on our smartphones to check the band working on your smartphone.
After finding the band combinations working on another device, please try to select 4G bands manually on the TP-Link device and make sure same bands are selected:
How to select 4G band manually on the web interface of LTE Gateway Routers
However, if your another device or phone shows 4G, no 4G+, please contact your ISP.
3. Please try to download large files or run Speed Test to see if TP-Link router will show 4G+, some ISPs might allocate more resources when there is high-traffic operation.
If the above troubleshooting still cannot locate or solve the problem, please leave your comment and provide the following information.
1) Model number, hardware and firmware version of your TP-Link LTE Advanced Router
2) Your country and ISP
3) Detailed problem description, band information on Status page, and you are using auto band or manually selected band
4) Brand & model No., of your another LTE Advanced device. Network Type and Band information on it with the same SIM card at same location.
5) Specifically, do you have XiaoMi phone for comparison?
6) Will 4G+ show up when you download large files or run Speed Test
7) System Log file of TP-Link device, you could save it on Advanced->System Tools->System Log page
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Hello, what is the latest ISP version for mr600 v3? Can I post my current ISP version here? Mine's current version is different for what is posted here:
https://www.tp-link.com/en/support/download/archer-mr600/
My ISP version starts with 220 while at the link is 230.
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Zauel wrote
Hello, what is the latest ISP version for mr600 v3? Can I post my current ISP version here? Mine's current version is different for what is posted here:
https://www.tp-link.com/en/support/download/archer-mr600/
My ISP version starts with 220 while at the link is 230.
Hi, the ISP file is common for different models as it includes APN profiles for different ISPs in the world. For more information about ISP file, please refer to this guide: Go to know ISP Upgrade Function on LTE Gateway Routers and Mobile Wi-Fi Devices
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@Sunshine
Just purchased the MR500 specifically for CA which I found doesnt work
Then I read these Forum pages, looks as though I have wasted money on purchasing this kit
I dont suppose I get sell it as nobody would want a router that defective
Are TP-Link any nearer to resolving this problem ?
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StOsyth wrote
@Sunshine
Just purchased the MR500 specifically for CA which I found doesnt work
Then I read these Forum pages, looks as though I have wasted money on purchasing this kit
I dont suppose I get sell it as nobody would want a router that defective
Are TP-Link any nearer to resolving this problem ?
Hi, most cases in this thread are about MR600, for MR500, it is highly recommended to follow the steps in the original post for troubleshooting first, if the issue still cannot be located, please provide the required detailed information for follow-up.
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@Sunshine does the product team has any updates? please let us know about the progress of the troubleshooting/investigatio and when a firmware update that fixes the issue is going to be available.
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Hi, I have tried the troubleshooting guide steps, but it still not works for me.
1) Model number, hardware and firmware version of your TP-Link LTE Advanced Router - Hardware Version:Archer MR600 v2 00000002, Firmware Version:1.7.0 0.9.1 v0001.0 Build 220826 Rel.58057n
2) Your country and ISP - India, Using Airtel & Jio
3) Detailed problem description, band information on Status page, and you are using auto band or manually selected band - 4g+ Career Aggregation not working on my device, band is set to auto selection.
4) Brand & model No., of your another LTE Advanced device. Network Type and Band information on it with the same SIM card at same location - Samsung Tab S9 Ultra
5) Specifically, do you have XiaoMi phone for comparison? - No
6) Will 4G+ show up when you download large files or run Speed Test - No
7) System Log file of TP-Link device, you could save it on Advanced->System Tools->System Log page - I was unable to attach the file so I am pasting the log file details below :
+++++++++++++====================LOG===================+++++++++++++++
2018-10-01 05:30:36 [5] 4G: init LTE module, set flowstat [enableDataLimit 0, enablePaymentDay 0, paymentDay 1, limitation 0, warningPercent 90]
2018-10-01 05:30:36 [5] 4G: LTE Module: profile num [2], default profile [1], active profile [1]
2018-10-01 05:30:36 [5] 4G: DM: profile num [2], default profile [1], active profile [1]
2018-10-01 05:30:37 [5] System: Enable IPv4 SPI Firewall
2018-10-01 05:30:37 [5] System: Enable IPv6 SPI Firewall
2018-10-01 05:30:42 [6] 4G: USER: lte_sms_status_valid 3.
2018-10-01 05:30:42 [6] 4G: USER: Get user's profile now.
2018-10-01 05:30:42 [6] 4G: USER: GetCurrProf result is: ipver:2 staticApn:1 authType:2 pkgName:Vodafone_Connect profname:Vodafone_Connect apn: usr: psw:
2018-10-01 05:30:48 [6] System: Device(F8:3B:1D:5D:D7:07) joins in 5G Wlan
2018-10-01 05:30:50 [5] DHCPD: Recv REQUEST from F8:3B:1D:5D:D7:07
2018-10-01 05:30:51 [5] DHCPD: Send ACK to 192.168.1.101
2018-10-01 05:30:58 [6] 4G: LTE connection up
2018-10-01 05:30:58 [5] 4G: LTE internet connected.
2018-10-01 05:30:58 [5] 4G: get LTE wan4
2018-10-01 05:30:58 [5] 4G: get LTE wan6
2018-10-01 05:30:58 [5] 4G: set LTE wan6 conn status Connecting
2018-10-01 05:30:58 [5] 4G: set LTE wan6 name LTE
2018-10-01 05:30:58 [5] 4G: set LTE wan6 prefix ::
2018-10-01 05:30:58 [5] 4G: set LTE wan4
2018-10-01 05:30:58 [5] 4G: set LTE wan6 ::
2018-10-01 05:30:58 [5] 4G: set LTE dns6 2402:8100:12:1::2416,2001:4860:4860::6464
2018-10-01 05:30:58 [5] 4G: set LTE default gw ::
2024-08-21 14:15:32 [6] 4G: LTE ipv6 connection up
2024-08-21 14:16:27 [6] System: Device(F2:26:E2:08:22:BF) joins in 5G Wlan
2024-08-21 14:16:27 [5] DHCPD: Recv REQUEST from F2:26:E2:08:22:BF
2024-08-21 14:16:28 [5] DHCPD: Send ACK to 192.168.1.102
2024-08-21 14:16:29 [6] System: Device(32:86:D1:6B:F5:29) joins in 5G Wlan
2024-08-21 14:16:30 [5] DHCPD: Recv REQUEST from 32:86:D1:6B:F5:29
2024-08-21 14:16:30 [5] DHCPD: Send ACK to 192.168.1.100
2024-08-21 14:31:42 [6] 4G: USER: The network disconnected, start autoconnect!
2024-08-21 14:31:42 [6] 4G: USER: Get user's profile now.
2024-08-21 14:31:42 [6] 4G: USER: GetCurrProf result is: ipver:2 staticApn:1 authType:2 pkgName:Vodafone_Connect profname:Vodafone_Connect apn: usr: psw:
2024-08-21 14:31:42 [6] 4G: USER: ModifyDefaultAttachProfileIP attach ip ver equal to profile
2024-08-21 14:31:42 [6] 4G: USER: Get user's profile now.
2024-08-21 14:31:42 [6] 4G: USER: GetCurrProf result is: ipver:2 staticApn:1 authType:2 pkgName:Vodafone_Connect profname:Vodafone_Connect apn: usr: psw:
2024-08-21 14:31:42 [6] 4G: ERROR: Bind mux port session 0 failed (0).
2024-08-21 14:31:42 [6] 4G: ERROR: Bind mux port session 1 failed (0).
2024-08-21 14:31:42 [6] 4G: ERROR: Now will call send_wan_ipv6_disconnect_msg func ...
2024-08-21 14:31:43 [6] 4G: ERROR: 0x0000000E QMI_ERR_CALL_FAILED
2024-08-21 14:31:43 [6] 4G: ERROR: Call end reason = 1.
2024-08-21 14:31:43 [6] 4G: ERROR: Verbose Call end reason = 51, type = 6.
2024-08-21 14:31:43 [6] 4G: USER: Connected to the network!
2024-08-21 14:31:45 [5] 4G: LTE internet connected.
2024-08-21 14:31:45 [5] 4G: get LTE wan4
2024-08-21 14:31:45 [5] 4G: get LTE wan6
2024-08-21 14:31:45 [5] 4G: set LTE wan6 conn status Disconnected
2024-08-21 14:31:45 [5] 4G: set LTE wan6 name LTE
2024-08-21 14:31:45 [5] 4G: set LTE wan6 prefix ::
2024-08-21 14:31:45 [5] 4G: set LTE wan4
2024-08-21 14:31:45 [5] 4G: set LTE wan6 2402:8100:2603:2eb7:381f:9ff:fe00:97e2
2024-08-21 14:31:45 [5] 4G: set LTE dns6 2402:8100:12:1::2416,2001:4860:4860::6464
2024-08-21 14:31:45 [5] 4G: set LTE default gw ::
2024-08-21 14:31:57 [6] 4G: LTE ipv6 connection up
2024-08-21 14:37:14 [6] System: Device(E8:C8:29:3A:41:B1) joins in 5G Wlan
2024-08-21 14:37:14 [5] DHCPD: Recv REQUEST from E8:C8:29:3A:41:B1
2024-08-21 14:37:15 [5] DHCPD: Send ACK to 192.168.1.103
2024-08-21 14:38:29 [6] System: Device(E8:C8:29:3A:41:B1) leaves 5G Wlan
2024-08-21 14:38:29 [6] System: Device(E8:C8:29:3A:41:B1) joins in 5G Wlan
2024-08-21 14:38:29 [6] System: Device(E8:C8:29:3A:41:B1) leaves 5G Wlan
2024-08-21 14:49:56 [6] System: Device(E8:C8:29:3A:41:B1) joins in 5G Wlan
2024-08-21 14:49:57 [5] DHCPD: Recv REQUEST from E8:C8:29:3A:41:B1
2024-08-21 14:49:57 [5] DHCPD: Send ACK to 192.168.1.103
2024-08-21 14:50:04 [6] System: User(Mac:E8:C8:29:3A:41:B1;IP:192.168.1.103) logs in.
2024-08-21 14:50:12 [6] Httpd: DNS 2402:8100:12:1::2416 resolve succeed for dns.msftncsi.com
2024-08-21 14:50:12 [6] Httpd: NCSI6 response check succeed.
2024-08-21 14:50:16 [6] Httpd: DNS 2402:8100:12:1::2416 resolve succeed for dns.msftncsi.com
2024-08-21 14:50:16 [6] Httpd: NCSI6 response check succeed.
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I have encountered an issue with my 4G+ connection following recent updates from your side. Previously, even when one of the carrier bands was disconnected, my device would still maintain a 4G+ connection. However, after the latest updates, whenever one of the bands is no longer available, the connection drops to regular 4G, which significantly reduces the speed.
Could you please assist me in resolving this issue? It seems that the carrier aggregation settings might have been altered, causing this drop in speed when only one band is active. I would appreciate your help in restoring the previous performance.
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Hello
I don't know what model of router you have.
But when you restart the router, does the band aggregation not work again?
It happens to me sometimes, it works fine, and then the rest of the time it stops working. Although it's not usual for me.
I restart the router, it changes the IP, and then the band aggregation works again.
Then I do a speed test to verify that it works fine and it is activated.
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