13.5.7 Fixed Wireless Access

While DSL, cable, and fiber broadband require a physical cable connecting every customer premises to the communication network, Fixed Wireless Access (FWA) provides broadband using terrestrial radio links. Instead of laying new cables, a wireless connection is established between a fixed base station and a radio terminal installed at the customer's premises. Fixed Wireless Access has become an increasingly attractive broadband solution wherever installing new copper or fiber infrastructure is technically difficult or economically impractical.

Unlike mobile cellular systems, where users may move continuously while maintaining communication, the customer equipment used in Fixed Wireless Access remains at a fixed location. Because the transmitter and receiver positions are known, antennas can be carefully aligned to maximize signal strength and minimize interference. This often allows higher data rates and more reliable communication than are achievable with fully mobile users operating under similar radio conditions.

A typical Fixed Wireless Access system consists of three principal components: a base station connected to the operator's core network; a radio link between the base station and the customer premises; and Customer Premises Equipment (CPE), which converts the received radio signal into Ethernet or Wi-Fi connectivity within the home or business. The base station normally serves many customers simultaneously, allocating radio resources dynamically according to traffic demand.

Fixed Wireless Access systems may operate in either licensed or unlicensed radio spectrum. Licensed spectrum provides exclusive operating rights within a particular geographical area, allowing network operators to manage interference and deliver predictable quality of service. Unlicensed spectrum, such as the 2.4 GHz and 5 GHz Industrial, Scientific and Medical (ISM) bands, permits rapid and inexpensive deployment but may experience increased interference because it is shared with many other wireless devices.

Depending on the operating frequency and terrain, Fixed Wireless Access systems may require either a clear line-of-sight (LOS) path or may operate successfully under non-line-of-sight (NLOS) conditions. Lower-frequency systems generally provide greater coverage and better penetration through vegetation and buildings, while higher-frequency systems offer much larger bandwidths but require clearer propagation paths and are more susceptible to attenuation caused by obstacles and rainfall.

Modern Fixed Wireless Access systems employ many of the same communication techniques used in contemporary cellular networks. These include Orthogonal Frequency Division Multiplexing (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA), adaptive modulation and coding, forward error correction, and multiple-input multiple-output (MIMO) antenna systems. Together, these techniques enable efficient spectrum utilization while adapting automatically to changing radio conditions.

As propagation conditions vary, the radio system continuously measures the quality of each communication link. Customers with strong signals may employ higher-order modulation schemes such as 64-QAM or 256-QAM, achieving high spectral efficiency and correspondingly higher data rates. When propagation conditions deteriorate because of increased distance, fading, or interference, the system automatically selects more robust modulation and coding schemes to maintain reliable communication, albeit at lower transmission speeds.

The achievable coverage and data rate depend upon several factors, including operating frequency, antenna height, transmitter power, terrain, and the number of users sharing the available radio spectrum. Lower-frequency systems may provide coverage extending many kilometers from the base station, whereas millimeter-wave systems operating above approximately 24 GHz generally serve much smaller areas but can support data rates approaching those of fiber-optic access.

One of the principal advantages of Fixed Wireless Access is its rapid deployment. New subscribers can often be connected simply by installing customer premises equipment and aligning the antenna toward the nearest base station, avoiding the time and expense associated with laying underground cables. This makes Fixed Wireless Access particularly attractive in rural and regional areas, newly developed housing estates, mining operations, temporary construction sites, and disaster recovery situations where communications infrastructure must be established quickly.

Fixed Wireless Access also provides an attractive alternative to upgrading ageing copper networks. In many regions, telecommunications providers have found that deploying new radio base stations is more economical than extending fiber to sparsely populated communities. As a result, Fixed Wireless Access has become an important component of national broadband strategies in many countries.

Despite its many advantages, Fixed Wireless Access also has limitations. Because radio spectrum is shared among multiple users, the available capacity varies according to network loading. Communication quality may also be affected by terrain, vegetation, buildings, weather conditions, and interference from neighboring systems. Careful network planning, appropriate frequency selection, and advanced antenna technologies are therefore essential to achieve reliable service.

Recent developments in 4G LTE and 5G technologies have significantly increased the capabilities of Fixed Wireless Access. Massive MIMO antenna arrays, beamforming, carrier aggregation, and wider radio channels have enabled many modern systems to deliver broadband services exceeding several hundred megabits per second, with some deployments approaching gigabit-class performance under favorable conditions. These advances have made Fixed Wireless Access a practical competitor to wired broadband technologies in many locations.

Fixed Wireless Access demonstrates that high-speed broadband does not necessarily require a physical cable to every customer. By combining advanced digital radio techniques with modern cellular technologies, it provides a flexible and rapidly deployable access solution that complements fiber, cable, DSL, and satellite broadband, particularly in areas where traditional wired infrastructure is difficult or expensive to install.