Hello,

I'm using the TP-Link Archer NX600 5G Router and  my carrier is O2 5G.

To improve reception, I've installed a POYNTING XPOL-2-5G external antenna. This has improved the router's 5G reception. In the router interface, I can see that it combines the N78 and N28 bands in the 5G range ("Band: N78,N28").

However, I've observed the following:

My mobile phone achieves significantly higher speeds at the same location. On my phone, I see in the Netmonster app that it uses 5G+LTE Carrier Aggregation (EN-DC), for example, 20 MHz LTE (Band 1/2100 MHz) as an anchor band + 70 MHz 5G (n78) + 10 MHz of another LTE band. Interestingly, the pure 5G (n78) signal on my phone is often even weaker (-104 dBm RSRP) than on the router.

However, my router (according to the app and observed speeds) seems to only combine a maximum of two bands (n78 and n28) and apparently does not utilize additional LTE bands via EN-DC to expand bandwidth, as my phone does. Therefore, it does not achieve the peak speeds of the phone.

My questions are:

1. Does the TP-Link Archer NX600 officially support 5G+LTE Carrier Aggregation (EN-DC), i.e., the combination of 5G bands with LTE bands (as my phone does)?
2. If yes, which specific 5G and LTE frequency bands can be combined by the Archer NX600 (all possible EN-DC combinations)? Is there a complete list available?
3. Is there a way in the router interface or via other diagnostic tools to clearly see if EN-DC is active and which LTE bands are precisely aggregated with 5G (beyond just the "Band: N78,N28" display)?
4. Are there any firmware updates planned or currently available that improve EN-DC performance or enable more band combinations?

Best regards,

Okan