Very slow LTE

I just have asked an AI :

Question:
These are the specs of the LTE4 router model CPE106-E, as posted by a seller on ebay:
"
Specification:
Model: CPE106-E
Frequency band:
CPE106-E: B1.B3.B5.B7.B8.B20.B40
Transmission rate: 300M
Wireless transmission power:
TDD-LTE: 23dbm±2dbm
FDD-LTE: 23dbm±2dbm
WCDMA: 23dbm±2dbm
WiFi frequency band: 2.4GHz
WiFi MIMO technology: 802.11b/g/n
LTE:
TDD-LTE: Cat4 130 Mbps DL / 35Mbps UL
FDD-LTE: Cat4 150 Mbps DL / 50Mbps UL
WCDMA: DL 21Mbp, UL 5.76Mbps
3GPP/3GPP2 protocol: LTE FDD/TDD Rel 9
WiFi standard: 802.11 b/g/n(2*2 only)
WiFi Authentication: WPA-PSK/WPA2-PSK default
"

And these are the LTE specs of a MikroTik LTE6 router:
"
Mobile
3G Category R8 (42.2Mbps Downlink, 11.2Mbps Uplink)
3G bands 1 (2100MHz) / 3 (1800MHz) / 5 (850MHz) / 8 (900MHz)
LTE Category 6 (300Mbit/s Downlink, 50Mbit/s Uplink)
LTE FDD bands 1 (2100MHz) / 3 (1800MHz) / 5 (850MHz) / 7 (2600MHz) / 8 (900 MHz) / 20 (800MHz) / 28 (700MHz)
LTE TDD bands 38 (2600MHz) / 40 (2300MHz) / 41 (2500MHz)
TAC 86335904
"

We have this problem: the MikroTik LTE6 router achieves only half the mobile connection speed of the CPE106-E (LTE4 router).
WiFi is not used in these speed tests, rather the PC is attached to the router via LAN cable.
How to explain this illogical speed discrepancy?

Answer:
The speed discrepancy between the MikroTik LTE6 router and the CPE106-E (LTE4 router) can be explained by several factors:

  1. Real-world performance vs. theoretical speeds: While the MikroTik LTE6 router is theoretically capable of higher speeds (300Mbps downlink), actual performance often falls short due to various factors such as signal quality, network congestion, and hardware limitations[2][4].

  2. Firmware issues: Some users have reported performance issues with MikroTik LTE devices after firmware updates. For example, one user mentioned that “reliability, speed and signal quality all dropped after I upgraded to v027”[8].

  3. Hardware efficiency: The CPE106-E may have more efficient hardware or better optimization for real-world conditions, despite its lower category rating[2].

  4. Carrier aggregation implementation: While the MikroTik LTE6 supports carrier aggregation, users have reported issues with it not working consistently, which could limit its performance[2].

  5. Antenna design: The CPE106-E might have a superior antenna design, allowing for better signal reception and, consequently, higher speeds[1].

  6. Device-specific issues: Multiple users have reported underwhelming performance with MikroTik LTE devices compared to other brands or lower-category devices[2][4][6].

To address this issue, you could try:

  1. Updating or downgrading the MikroTik router’s firmware
  2. Adjusting the router’s settings, such as band selection and carrier aggregation
  3. Improving the antenna setup or positioning

However, it’s important to note that many users have reported similar experiences with MikroTik LTE devices underperforming compared to lower-category devices from other manufacturers[6]. This suggests that the issue might be inherent to the MikroTik LTE product line rather than a problem with a specific unit.

Citations:
[1] > https://mikrotik.com/products
[2] > http://forum.mikrotik.com/t/lhg-lte6-slow-performance/147104/1
[3] > https://mikrotik.com/product/r11e_lte6
[4] > https://www.reddit.com/r/mikrotik/comments/1bqqfob/hap_ax_lite_lte6_really_slow_speeds/
[5] > https://mikrotik.com/products/group/lte-5g-products?s=c
[6] > http://forum.mikrotik.com/t/cat6-lgh-lte-super-bad-performance/136629/1
[7] > https://mikrotik.com/products/compare/RBLHGR_R11e-LTE+RBLHGR_R11e-4G+RBLHGR_R11e-LTE6
[8] > http://forum.mikrotik.com/t/lhgg-lte6-kit-internet-dropping-and-slower-than-with-a-cheap-4g-router/148011/1

I think the AI is right with this:
5. Antenna design: The CPE106-E might have a superior antenna design, allowing for better signal reception and, consequently, higher speeds[1].

Indeed, the CPE106-E has two big antennas (cf. img below), whereas the MikroTik LTE router does not have any such big antennas…
CPE106-E.png