# Fixed Wireless Access in Flexible Environment: Problem Definition and Feasibility Check
###### Abstract  
This paper presents a problem definition and feasibility check for an algorithm to select a connection point in an existing fiber-optical access network topology that can be used to connect a new site, the planned location, via an \(E\)-band millimeter-wave radio link. The newly added fixed wireless access connections must meet end-to-end network requirements for availability, latency, and bandwidth. To accommodate highly dynamic service traffic patterns, requirements are defined with a suitable time granularity. Similarly, dynamic changes in available network capacity affect end-to-end availability, latency, and bandwidth. The proposed algorithm is designed to handle these dynamic changes both in the service requirements and in the available resources. availability; dynamic load; FWA; latency; network topology 2025142891  
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Faxed Wireless Access (FWA) is commonly used as an alternative for wireline connections in the last mile [1]. The concept has existed for some time, known as integrated Fiber-Wireless (FiWi) broadband access network [2], hybrid Wireless-Optical Broadband Access Network (WOBAN), or broadband wireless access (BWA) [3, 4]. Earlier, FWA was mainly considered an undesirable, inferior substitute. In developed countries, wired subscriber access can take years to materialize in certain locations [5], while in emerging countries, fixed broadband is not yet widespread. However, utilizing 5G New Radio (NR) in the millimeter wavelength bands enables the delivery of high-speed broadband services comparable to fixed (copper or fiber) connections. Accordingly, one of the earliest utilizations of 5G is FWA, which promises to deliver Gigabit internet speeds. To permanently substitute wireline connection in the last mile (both for enterprises and for residential communities), FWA must provide the same (or better) connectivity not only from bandwidth, but from availability perspective as well [6]. Furthermore, FWA can often be brought to homes/businesses for a fraction of the cost of installing a wired connection. Finally, deploying FWA may improve latency (beeline radio hop instead of a meandering optical cable path). When wired solutions are unavailable, point-to-point radio access (FWA) from/to the existing backhaul network offers a rapid solution [1, 6]. Existing methods for designing wireless connections usually focus on achieving the desired throughput and availability for the new radio link only, without considering end-to-end (e2e) availability, throughput, andlatency [7]. (For the wireless part, several radio-link planning tools exist e.g., PathLoss [8] and Comsearch IQ-Link [9]). However, no algorithm currently addresses the problem of providing broadband access at a specific location, ensuring that e2e throughput, availability, and latency requirements are met for connections to a data center or to the internet in general, all within a constrained timeframe. In the era of 5/6G networks, the traffic of the specific location is expected to comprise multiple services with diverse requirements. At the same time, the load handled by the existing infrastructure continuously fluctuates. Although selecting the closest connection point in the existing nearby optical network is often the best approach, this lacks algorithmic rigor, and numerous scenarios exist where this approach fails [10; 11].