Multi-Carrier Link Aggregation


A Spectrum Perspective


Microwave radio spectrum is fragmented and uneven across the traditional frequencybands. Furthermore propagation behaviour is different as we grow in frequency. The resulting picture is that some frequency bands are more heavily used then other, either because those frequency bands are open and made available worldwide, or simply because better fit the need of mobile backhauling representing the biggest application of the market. Consequently we will also have other frequency bands underused, regardless of spectrum width availability.
In the below qualitative picture we represented how frequency impact distances, as well as the usage of the spectrum, showing the portion between 15GHz to 23GHz being congested, and the available bandwidth per frequency band.


The highest congested frequency band groups are characterized by a low spectrum availability, while high frequency bands offering also a wide spectrum are generally underused.
Multi-Carrier Link Aggregation offers a solution to smartly couple different frequency band and respective bandwidth as if a single logical pipe, offering the advantage of long reach of one frequency band, with higher capacity of the other, with a smart management of traffic priority vs link availability.


Hybrid Link

With the term of Hybrid link we identify the bonding between a standard frequency band (e.g. 18GHz) with the millimetre frequency band of 80GHz.
With hybrid link we combines Ultra high capacity of E-Band Radio with the Higher Availability of a standard licensed frequency band.


  • Extends E-band hop length to several kilometers, exceeding urban reach
  • Upgrade capacity of existing Microwave hops without impacting availability and limiting OPEX costs impact


When experiencing high traffic growth in the network adding to an existing deployed link an 80GHz link in link aggregation offers a drastic capacity growth (4 times extra capacity) with limited OPEX costs, taking advantage of the little to no license schemes regulating millimetre wave frequency bands.

Furthermore with the smart coupling between a licenced band and an 80GHz band, the link could be extended from the traditional urban distances to reach sub-urban/rural lengths of 10Km.



3 Channels

2 Frequencies

1 Antenna


Full Out Door Solution


Split Mount Solution







This solution can be achieved coupling several ODU types, either via IF or Ethernet cable. The bonding can be achieved between an ALFOplus80HDX (80GHz) and the AGS20  linking together a 2+0 xpic standard frequency bands with a 10Gb single channel resulting in a 3+0 link, over single antenna.
the same configuration can also be achieved in a full outdoor architecture coupling the ALFOplus2 with ALFOplus80HDX.
This gives operators the freedom to address a wider option of cases, as well as upgrade existing link in any configuration, maximizing the benefit throughout the network.

Multi Band Link

The same behaviour can also be achieved by aggregating two links from two licenced frequency bands.
With Multiband link we exploit available spectrum at higher licensed frequency bands while leveraging on extra reach of lower licensed frequency bands



  • Relief Bandwith of congested spectrum of lower frequency bands
  • Upgrade capacity of existing Microwave hops without impacting availability



The use of Multi-Carrier Link Aggregation is another tool at the service of operators to address the constant traffic capacity growth. With this implementation microwave radio plays on its strength of flexibility to re-arrange existing components to provide a new way to offer connectivity.



  • Based on already available products
  • No dedicated hardware needed
  • Fully hitless solution in any stage of RF state change
  • Lowest power consumption solution
  • HQoS of smart traffic management


SIAE MICROELETTRONICA related microwave radio equipment:



NOTE! This site uses cookies and similar technologies.

If you not change browser settings, you agree to it. Learn more

I understand
To make this site work properly, we sometimes place small data files called cookies on your device. Most big websites do this too.

What are cookies?

A cookie is a small text file that a website saves on your computer or mobile device when you visit the site. It enables the website to remember your actions and preferences (such as login, language, font size and other display preferences) over a period of time, so you don’t have to keep re-entering them whenever you come back to the site or browse from one page to another.

How do we use cookies?

  • Our site uses cookies only to improve navigability, to identify and remember users' actions.
  • The cookies used are of the session type.
  • The cookies are not controlled from third parties.
  • The cookies will not be used for any purposes other than the ones stated

Enabling these cookies is not strictly necessary for the website to work but it will provide you with a better browsing experience. You can delete or block these cookies, but if you do that some features of this site may not work as intended.
The consent can be withdrawn at any time.

How to control cookies

You can control and/or delete cookies as you wish – for details, see You can delete all cookies that are already on your computer and you can set most browsers to prevent them from being placed. If you do this, however, you may have to manually adjust some preferences every time you visit a site and some services and functionalities may not work.