Abstract-New architectural and design approaches for Radio Access Networks have appeared with the introduction of network virtualization in the wireless domain. One of these approaches splits the wireless network infrastructure into isolated virtual slices under their own management, requirements and characteristics. Despite the advances in wireless virtualization, there are still many open issues regarding the resource allocation and isolation of wireless slices. Because of the dynamics and shared nature of the wireless medium, guaranteeing that the traffic on one slice will not affect the traffic on the others has proven to be difficult. In this work, we focus on the detailed definition of the problem, discussing its challenges. We also provide a review of existing works that deal with the problem, analyzing how new trends such as SDN and NFV can assist in the slicing. We will finally describe some research challenges on this topic.

Abstract-Individual wireless access networks show limitations that can be overcome through the integration of different technologies into a unified platform (i.e. 4G system). Nevertheless, the integration of heterogeneous networks poses many challenges such as adding complexity to the processes of deciding when to handoff, selecting the best network, and minimising roaming effects using appropriate handover methods. This paper presents PROTON, a novel solution that assists mobile users in the decision-making process related to roaming between heterogeneous technologies. PROTON deploys a formal policy representation model, based on Finite State Transducers, that evaluates policies using information from the context to manage mobiles' behaviour in a transparent manner, hiding 4G systems' complexities. We blend concepts of autonomic computing into the design of the solution and manage to improve user experience in typical 4G scenarios while keeping transparency.Index Terms-policy systems, 4G networks, Finite State Transducer, heterogeneous, handover.

Network slicing is one of the key enabling technologies for 5G networks. It allows infrastructure owners to assign resources to service providers (tenants), which will afterwards use them to satisfy their end-user demands. This paradigm, which changes the way networks have been traditionally managed, was initially proposed in the wired realm (core networks). More recently, the scientific community has paid attention to the integration of network slicing in wireless cellular technologies (LTE). However, there are not many works addressing the challenges that appear when trying to exploit slicing techniques over WiFi networks, in spite of their growing relevance. In this paper we propose a novel method of proportionally distributing resources in WiFi networks, by means of the airtime. We develop an analytical model, which shed light on how such resources could be split. The validity of the proposed model is assessed by means of simulation-based evaluation over the ns-3 framework.

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In the near future mobile devices with several interfaces will become commonplace. Most of the peripheral networks using the Internet will therefore employ wireless technology. To provide support for these devices, this paper proposes a new framework which encompasses the functions of both peripheral and core networks.The framework is called Y-Comm and is defined in a layered manner like the OSI model.

This paper presents a formal framework for a policy representation model based on Finite State Transducers (FSTs). The main motivation for this approach is to produce the formalities to represent the body of policies in an unambiguous way.Using well-known entities such as finite state machines, we propose interpretations and adaptations to the basic theory to fit in the domain of policy based management. Policies are modeled as finite state transducers that consume events, and a function we call a tautness function is defined to be on the transitions.The operations of finite state transducers are revised accordingly. In particular, we present determinization and intersection operations for FSTs that will mimic the modality conflict resolution process between policies. We also demonstrate how the composition of transducers could be used to express constraints or meta-policies. In our approach, all the tasks associated with the conflict resolution process can be done "a priori," and the computing of a policy-evaluation is linear in the number of events, and independent of the number of policies.

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