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As technology progresses, the expectation of an “always-on” society grows. Smartphones now sit at the center of daily life: two thirds (66%) of UK adults own one, and global ownership is projected to exceed one third of the world’s population by 2017. As the number of mobile devices rises rapidly, networks face increasing strain. Mobile network operators (MNOs) must ensure customers receive a reliable, high-quality service, particularly since Ofcom reports that smartphones are the primary device UK users rely on to access the internet.
At the same time, changes in building design and construction intended to improve energy efficiency are creating new challenges. Eco-friendly materials—such as metal-oxide coatings on glass—can impede mobile signals inside buildings. That makes it harder for MNOs to deliver the coverage and call quality subscribers expect, driving up user dissatisfaction in an already competitive market.
Wi‑Fi has emerged as a practical solution. By leveraging the widespread availability of Wi‑Fi networks, MNOs can ensure subscribers continue to benefit from their service plans through technologies like Wi‑Fi calling. Unlike over-the-top (OTT) apps such as Skype or WhatsApp, native Wi‑Fi calling is integrated into the handset, offering a seamless experience. However, this approach requires operators to deliver critical services over infrastructure they do not own or fully control. That shift forces MNOs to cede some control over quality of service (QoS)—a considerable strategic and operational change that puts part of their reputation in the hands of third‑party wireless networks.
To avoid QoS problems, MNOs—and enterprises deploying private networks—must invest in wireless infrastructure capable of supporting carrier‑class services. Enterprise‑grade Wi‑Fi that supports carrier-class voice and data can be characterized by three core capabilities:
High-density, high-performance
Users should not experience falling coverage or degraded call quality as more devices join the network. Strong radio frequency (RF) performance, driven by smart antenna systems, mitigates interference by continuously optimizing the RF path to each client in real time. These adaptive antennas help devices maintain higher data rates even under challenging RF conditions, reducing packet loss and jitter that can hurt real‑time services.
In crowded environments—such as schools, conference centers, or large office buildings—directed roaming improves the overall user experience across the WLAN. When a client’s signal drops below administrator-defined RSSI or throughput thresholds, the access point (AP) can compile alternatives and request the client roam to a neighboring AP with a stronger connection. This prevents “sticky” clients from remaining connected to a suboptimal AP and preserves good performance for all users.
Intelligent data prioritisation
Having strong signal strength is only part of the equation. Networks must prioritize traffic so time‑sensitive flows receive the QoS they need. Many modern services encrypt traffic, making simple packet inspection ineffective for classification. Advanced wireless systems, however, can identify and prioritize encrypted flows by analyzing traffic behavior. They classify traffic into queues—typically voice, video, best effort, and background—using indicators such as the IP type-of-service (ToS) bits or heuristics that examine packet size, timing and frequency. This behavior-based classification ensures voice and other latency-sensitive traffic are placed ahead of less critical data.
Smart access control
Connection alone doesn’t guarantee a usable service—available bandwidth and overall capacity determine the actual user experience. When too many devices attempt to connect to a single AP, active clients may suffer degraded performance. Modern APs can apply capacity-aware access control algorithms to reject new connection requests when accepting additional clients would compromise service levels. This call admission control protects existing users during peak load, preserving usable performance and preventing widespread service deterioration.
Delivering true carrier-class voice over Wi‑Fi requires a Wi‑Fi infrastructure built to carrier standards: adaptive antenna technology for optimal signal, intelligent traffic prioritization to protect voice even when encrypted, and admission control to limit load and preserve quality. By addressing these elements, MNOs can offer superior Wi‑Fi calling and other carrier-class services, improving customer satisfaction and enhancing retention in a competitive market.