Mobile operators are facing a data crunch. Sales of bandwidth-hungry mobile broadband devices continue to rise, yet consumer-driven flat-rate, unlimited data plans mean revenues aren’t keeping pace with growing data volumes. Networks are increasingly congested. A recent Juniper Research report forecast that nearly 50% of data traffic generated by 3G/4G-connected devices will be offloaded to Wi‑Fi and small cell networks this year.
This equates to roughly 10 billion movie downloads, or about 9,000 petabytes shifted away from mobile networks.
Mobile network operators (MNOs) are therefore hit by a double squeeze: falling data billings per byte and diminishing effective network capacity, which forces additional infrastructure investment. Subscribers accustomed to flat-rate plans are likely to resist any return to strict usage-based billing and may switch providers if their mobile data experience deteriorates. To resolve the pressure on their networks, MNOs generally have three options: acquire more licensed 3G/LTE spectrum, improve the efficiency of their radio access networks, or boost base-station and access technology to deliver more bandwidth.
Acquiring spectrum is prohibitively expensive, and LTE is already reaching high levels of spectral efficiency. As a result, many operators are turning to enhanced base-station and access technologies that support Wi‑Fi offloading. Some operators are introducing 802.1x EAP-SIM Wi‑Fi offload services to move traffic from 3G/LTE to access media that is cheaper to deploy and operate while offering comparable user performance.
Preserving control
The key challenge for MNOs implementing Wi‑Fi offload is maintaining control and management of subscribers and their traffic in ways similar to how they manage cellular networks today. Many access-point vendor solutions lack the multifunctional networking features operators need. Without application control, for instance, an operator cannot manage traffic content or fully identify which subscribers are accessing which services. Operators have pursued two main approaches to address this.
One approach aggregates Wi‑Fi traffic to a central, operator-controlled point with multifunctional networking capabilities. However, this centralized design may not be future-proof. A single 802.11ac access point can generate up to 800 Mbps, so 1,000 access points could require an aggregate capacity approaching 800 Gbps. Central aggregation also demands site-specific management and can become complex and costly as capacity expands.
The second approach installs multifunctional appliances at each site to handle mobile data offload locally. While this preserves control, it increases CAPEX and OPEX and forces hardware upgrades or replacements as bandwidth demands grow.
Authentication matters
An alternative, more flexible solution is to deploy technology that integrates with any networking infrastructure and enables seamless authentication of mobile subscribers without user interaction, making handovers between cellular and Wi‑Fi transparent. MNOs can also use web-portal authentication to grow the subscriber base.
The core of this approach is authentication proxying. By inspecting authentication exchanges between access points and the operator’s subscriber database, this method provides visibility into each user’s identity and subscription profile, creating a foundation for effective network management. Typical subscriber information obtained includes:
- Application usage within the Wi‑Fi network
- Volume of data transferred over Wi‑Fi
- Session duration in the Wi‑Fi network
- IP–MAC–IMSI mappings
- Visited URLs
- Visited URL categories
Collecting this information and tracking the corresponding traffic reduction in the mobile core allows operators to improve the overall user experience. MNOs can offer subscribers advanced services that extend beyond basic connectivity, including application management and control, web-category blocking, anti-malware protections, and bandwidth shaping.
Security considerations
Security is a primary concern when offloading data to Wi‑Fi. Customers expect their traffic to be protected at least to the same level as on 3G and LTE. SIM-based authentication addresses that expectation by verifying users via their device SIM cards when switching to Wi‑Fi, using the same authentication mechanism as the cellular network. This process requires no user action while enabling operators to manage and enforce user policies.
Another advantage of SIM authentication is stronger encryption. In light of public concerns about state-level interception of communications, the ability to use 802.1x encryption methods ensures that session data on operator-run or partner Wi‑Fi networks is protected and helps restore customer confidence in privacy and confidentiality.
Real benefits for operators and subscribers
Transparent mobile data offloading to Wi‑Fi offers tangible benefits to MNOs: it eases congestion on the mobile core network, reduces the need for costly upgrades and build-outs, and enables new incremental services that can generate revenue. The long-standing challenge for operators—to retain control of the subscriber relationship—remains central. What matters is the capability to keep traffic on operator-managed Wi‑Fi networks or, when partnering with third parties, to track and manage subscriber traffic effectively.
From the subscriber perspective, offloading brings a better data experience: high-speed connectivity in more places with no need to repeatedly log into multiple networks. Users simply turn on their devices and enjoy available bandwidth, improving service stickiness, lowering churn, and helping operators protect their revenue streams. Properly implemented, Wi‑Fi offloading becomes a win-win: reducing operator headaches while delivering a superior experience for customers.
Note: The original article referenced a vendor solution for intelligent mobile offloading.