Microwave Backhaul: The Backbone of 5G Networks
Mobile networks are getting faster, but speed is only one part of the story. Behind every reliable call, video stream, cloud application, and 5G connection is a transport network moving data between cell sites and the core network. This is where backhaul in telecom becomes critical.
For many years, fibre has been seen as the preferred option for high-capacity network transport. However, fibre is not always practical. Remote locations, difficult terrain, road crossings, deployment costs, and the time required to build new fibre routes can make it difficult to connect every mobile site.
That is why microwave backhaul continues to play an important role.
Modern microwave links can deliver high capacity, low latency and fast deployment without requiring physical cables between sites. As 5G networks expand into rural areas, suburban locations and hard-to-reach sites, wireless transport remains an important part of the telecom infrastructure mix.
According to Ericsson’s 2025 Microwave Outlook, microwave backhaul is used in 75% of live 5G networks globally, while Ericsson expects the global mobile backhaul market to reach a near-even split between microwave and fibre by 2030, at 49% and 51% respectively.
So, what makes microwave backhaul so important, and where does it fit into the future of mobile networks?
What Is Backhaul in Telecom?
In simple terms, backhaul is the part of a telecommunications network that carries traffic from the access network to the core network.
A mobile user connects to a nearby cell site. That cell site then needs a reliable connection to the operator’s wider network. The connection between the cell site and the core is known as mobile backhaul.
A simplified network path looks like this:
User Device → Cell Site → Backhaul Network → Mobile Core → Internet or Service
Backhaul can use several technologies, including:
- Fibre optic networks
- Microwave radio links
- Millimetre-wave connections
- Ethernet
- IP/MPLS transport
- Other wireless transport technologies
Nokia defines mobile backhaul as the transport network connecting 4G baseband units or 5G central units with the mobile core.
This makes backhaul a key part of the overall mobile network. A fast radio network cannot deliver its full potential if the transport network behind it does not have enough capacity.
What Is Microwave Backhaul?
Microwave backhaul uses radio frequencies to create a wireless connection between two network locations, typically between a cell site and another cell site, aggregation point or fibre-connected location.
Instead of digging trenches and installing physical cable, operators can install microwave antennas at suitable locations and establish a point-to-point wireless link.
A typical microwave link includes:
- Microwave radio equipment
- Parabolic antennas
- Outdoor units
- Indoor or integrated network equipment
- Mounting structures
- Power systems
- Network management software
The antennas need a suitable radio path between them. This is why line of sight (LOS), antenna height, frequency selection and link planning are important during deployment.
The technology has been used in telecom networks for decades, but modern equipment is significantly more capable than older microwave systems.
Today’s solutions can support much higher capacity and can combine different frequency bands to improve network performance.
Why Is Microwave Backhaul Still Important?
The growth of fibre networks has not made microwave obsolete.
Instead, modern operators increasingly use fibre and wireless backhaul together.
There are several reasons for this.
1. Faster Deployment
Building fibre can require civil engineering work, permissions, road access, trenching and extensive planning.
A microwave link can often be installed much faster when suitable sites and spectrum are available.
The GSMA notes that microwave backhaul can be deployed in a matter of days and avoids the need for trenches and ducting.
This can be particularly valuable when an operator needs to connect a new cell site quickly.
2. Useful in Remote Locations
Not every location has easy access to fibre.
A mobile operator may need to connect a site in:
- Rural areas
- Mountainous regions
- Islands
- Highways
- Industrial areas
- Construction zones
- Offshore locations
- Other difficult-to-reach areas
In these situations, installing fibre may be expensive or technically difficult.
Wireless backhaul can provide another way to connect the site.
3. Lower Civil Engineering Requirements
Fibre deployment often involves physical infrastructure work.
Microwave does not require a physical cable between the two radio locations.
That can reduce some of the civil engineering work associated with new connectivity.
However, microwave still requires proper planning, site access, tower infrastructure, power and spectrum coordination.
4. Network Resilience
Microwave can also provide redundancy.
Consider a cell site that primarily uses fibre. If the fibre route is damaged during road construction, flooding or another incident, the site could lose connectivity.
A microwave link can provide an alternative path.
Ericsson highlights microwave’s role in protecting networks against disruptions such as fibre cuts.
For operators, this means microwave is not simply a replacement for fibre. In many cases, it can act as an important backup or complementary transport technology.
How Does Microwave Backhaul Support 5G?
5G is increasing the demands placed on every part of the network.
Users expect:
- Higher download speeds
- Lower latency
- Reliable connections
- More connected devices
- Better performance in crowded areas
- Support for real-time applications
This creates greater requirements for 5G backhaul.
The radio access network may provide extremely high speeds over the air, but that traffic still has to travel through the transport network.
If the backhaul connection is under-capacity, the benefits of a high-performance 5G radio network can be limited.
Modern microwave systems address this through higher-capacity radios, wider channels, advanced modulation, carrier aggregation and higher-frequency solutions.
For example, E-band technology operates in higher frequency ranges and can provide multi-gigabit connectivity over suitable link distances.
Nokia notes that E-band solutions are increasingly important for high-capacity 5G transport, while traditional microwave bands remain useful for longer links and broader coverage scenarios.
Microwave Backhaul vs Fibre Backhaul
The debate should not simply be about whether microwave is better than fibre.
The more useful question is:
Which transport technology is best for the specific site?
| Factor | Microwave Backhaul | Fibre Backhaul |
|---|---|---|
| Physical cable required | No | Yes |
| Deployment speed | Generally fast | Can be slower |
| Civil works | Limited compared with fibre | Often significant |
| Long-term capacity | High, depending on technology | Extremely high |
| Remote locations | Very useful | Can be difficult |
| Weather impact | Can be a consideration | Generally less affected |
| Redundancy | Excellent option | Excellent option |
| Deployment flexibility | High | Depends on fibre availability |
| Best use case | Remote, rapid or resilient connectivity | High-capacity permanent routes |
Fibre remains extremely important, particularly where large and predictable capacity is required.
Microwave becomes particularly attractive where deployment speed, geographic constraints, resilience or cost are major considerations.
In many networks, the strongest strategy is a combination of fibre and microwave.
Key Technologies Used in Modern Microwave Backhaul
Modern telecom backhaul is much more advanced than traditional point-to-point radio links.
High-Capacity Microwave
Newer radios support significantly higher throughput than earlier generations.
This allows operators to transport large volumes of mobile traffic without immediately requiring fibre at every location.
E-Band
E-band operates at approximately 70/80 GHz and provides very wide channels.
It is particularly useful for high-capacity short-to-medium-distance connections, including dense urban 5G deployments.
The GSMA identifies V-band and E-band as suitable for 5G backhaul, with E-band and V-band links capable of supporting data rates in the 10 Gbps to 25 Gbps range in suitable deployments.
Carrier Aggregation
Carrier aggregation allows multiple frequency bands to work together.
This can increase capacity and improve the efficiency of the available spectrum.
It can be particularly useful when operators need to increase capacity without completely replacing the existing transport network.
Adaptive Modulation
Adaptive modulation allows the radio link to adjust its modulation according to current conditions.
During good conditions, the link can operate at higher capacity.
During difficult conditions, it can reduce capacity to maintain connectivity.
This creates a balance between capacity and availability.
Multi-Band Links
Operators can combine different frequency bands to achieve a balance between long-distance coverage and high capacity.
Lower frequencies can provide better reach, while higher frequencies can provide greater capacity over shorter distances.
This approach is increasingly relevant as mobile networks become denser.
What Are the Main Challenges?
Microwave is powerful, but it is not a perfect solution for every deployment.
Line of Sight
A clear radio path between the antennas is normally required for point-to-point microwave links.
Buildings, hills, trees and other obstacles can affect the link.
Network planners therefore need accurate terrain and path analysis.
Rain and Weather
Higher-frequency links can be more sensitive to rain.
This is particularly important for E-band deployments.
Operators need to consider:
- Rainfall intensity
- Link distance
- Frequency
- Antenna size
- Fade margin
- Required availability
Nokia’s work with an Indian operator demonstrated the importance of testing E-band microwave performance under heavy rainfall conditions, particularly during the monsoon season.
Spectrum Planning
Microwave links use specific frequency bands and may require licensing or coordination depending on the band and local regulations.
Poor frequency planning can lead to interference and reduced network performance.
Capacity Planning
Traffic does not stay constant.
A link that has enough capacity today may become a bottleneck as:
- More users connect
- 5G coverage expands
- Video traffic increases
- Enterprises adopt private 5G
- IoT deployments grow
- New applications consume more bandwidth
Capacity planning therefore needs to consider future traffic, not just current requirements.
How to Plan a Reliable Microwave Backhaul Link
A strong microwave deployment starts with proper engineering.
1. Understand the Traffic Requirement
Estimate current and future traffic.
Do not size the link only around today’s demand.
2. Analyse the Radio Path
Check:
- Distance
- Terrain
- Obstacles
- Antenna heights
- Fresnel zone
- Expected interference
3. Select the Right Frequency
The frequency should match the required:
- Distance
- Capacity
- Availability
- Regulatory requirements
- Weather conditions
4. Set the Availability Target
Different applications have different requirements.
A standard mobile site and a mission-critical service may need different availability targets.
5. Plan for Growth
Leave sufficient room for future traffic.
Technology such as adaptive modulation, carrier aggregation and multi-band operation can provide additional flexibility.
6. Monitor the Link
Once deployed, the network should be continuously monitored.
Key metrics include:
- Throughput
- Latency
- Packet loss
- Signal level
- Error rates
- Availability
- Modulation changes
- Capacity utilisation
Monitoring helps identify issues before they become major service problems.
Microwave Backhaul and the Future of Mobile Networks
The future of wireless backhaul is not about competing with fibre at every location.
It is about creating a flexible transport network where different technologies work together.
This is becoming more important as operators expand:
- 5G coverage
- Private 5G networks
- Rural broadband
- Industrial connectivity
- Smart infrastructure
- IoT services
- Edge computing
Ericsson’s 2025 research expects microwave and fibre to reach a near-even 49/51 split in mobile backhaul by 2030. The same research reports that microwave already supports 75% of live 5G networks globally.
This suggests that microwave is not simply an old technology being kept alive.
It is evolving.
Higher-frequency spectrum, larger channel sizes, better antennas, adaptive technologies, automation and AI-assisted network management are helping microwave transport meet new network requirements.
Why Businesses Should Pay Attention to Telecom Backhaul
Backhaul is sometimes overlooked because customers do not directly see it.
They see:
5G signal → fast connection → application
But behind that experience is a complex transport network.
For businesses deploying telecom infrastructure, private wireless networks or connected services, backhaul decisions can affect:
- Network performance
- Reliability
- Deployment time
- Operating costs
- Scalability
- Service availability
A well-designed transport network should therefore be treated as part of the overall network strategy, rather than an afterthought.
Conclusion: Microwave Backhaul Remains a Critical Network Layer
The growth of fibre has not eliminated the need for microwave.
Instead, modern microwave backhaul has become a flexible part of the wider mobile transport ecosystem.
It can help operators connect remote sites, accelerate network deployment, improve resilience and support the growing capacity requirements of 4G and 5G networks.
The key is not to view microwave and fibre as competing technologies.
The strongest networks use the right technology for the right location.
As mobile networks become more connected, distributed and data-intensive, reliable telecom backhaul will become even more important. Microwave technology, supported by higher-capacity radios, E-band, carrier aggregation, adaptive modulation and smarter network management, is well positioned to remain part of that future.
Planning a reliable telecom or mobile network infrastructure? Explore how the right combination of microwave, fibre and other transport technologies can help improve connectivity, resilience and scalability. Speak with our telecom infrastructure team today to discuss your network requirements.
