Eduard C. Popovici

Development of an IEEE 802.21 Media Independent Information Service

This paper provides a view on the developing process of the Media Independent Information Service, later referred as MIIS, described in the IEEE 802.21 standard, which has the main functionality of providing the mobile terminal information about all access points in his coverage area. Our approach is towards the management of the entire mechanism of delivering data to the device, that is realized at a central location. The first chapter describes related work on IEEE 802.21 standard, and it-s linkage with the MIIS entity. The following chapters present the general architecture of the system, important aspects of implementation, the used technologies and also a set of research directions. The final section presents a performance evaluation, giving us a clue about the systems real functioning and serving capabilities.

Solution for implementing IEEE 802.21 Media Independent Information Service

This paper describes a solution for implementing the Media Independent Information Service, later referred to as MIIS, described in IEEE 802.21 standard. First we present the previous work towards defining a complete system capable of realizing a vertical handover according to the standard. Next we detail the MIIS general architecture, the information gathering procedures and considerations about the data format used in communicating. The last section presents a typical usage scenario and the advantages of implementing MIIS.

Consideration on interoperability of different wireless access networks using the IEEE 802.21 approach

The paper describes the main issues regarding the interoperability between some representative wireless access networks and the corresponding vertical handover in wireless hybrid access networks. The proposed approach conforms to the IEEE 802.21 media independent handover (MIH) standards.

Real-time monitoring design of a wireless network device for vertical handover on multimod terminals

In this paper we propose a software module for continuously monitoring a wireless network card, able to handle and rise IEEE 802.21 compatible primitives in support for vertical handover in heterogeneous networks. This module is intended to be installed on a multimod mobile terminal, and will automatically monitor and switch the connection link, when performing vertical handover. Besides the software architecture, we describe the real-time behavior of the module by using state machine diagrams.

Context-aware reconfigurable interoperability for vertical handover in wireless communications

In this paper we describe a context-aware reconfigurable system, which implements the IEEE 802.21 Media Independent Handover (MIH) standard for interoperability between wireless hybrid access networks. The proposed approach uses vertical handover prediction algorithms to improve the resource management decisions, through access to our Web Service implementation of the Media Independent Information Service (MIIS), which stores previously acquired information about surrounding hybrid access networks. Various prediction alternatives are discussed, and two proposed algorithms are evaluated, on our prototype implementation of the system.

Media independent vertical handover in hybrid networks — From standard to implementation

This paper describes the road of RIWCoS architecture for reconfigurable interoperability and service continuity in wireless hybrid communications: from the IEEE 802.21 MIH standard, through generic modules design and specification, toward implementation and integration. Given the results obtained during the development of the prototype demonstrating a vertical handover, we can affirm that there is not much time left until all mobile devices will be equipped with stable software, capable of offering the user, unlimited mobility experience.

A comparison between several Software Defined Networking controllers

The networking industry faces nowadays with the emergence of a somewhat revolutionary paradigm that is intended to rethink network architectures, with the intention to mitigate the limitations that appeared in the traditional networks: Software Defined Networking (SDN). This paper illustrates differences between some SDN controllers, which represent the “brains” of the network. POX, Ryu, ONOS and OpenDaylight are the SDN controllers for which a comparison between their performances is made, using the mininet simulation environment.

An IEEE 802.21-based approach of designing interoperability modules for vertical handover in wireless hybrid access networks

In this paper we described the generic design of software interoperability modules for vertical handover in wireless hybrid access networks. The proposed approach conforms to the IEEE 802.21 Media Independent Handover (MIH) standard and fits into our architecture for reconfigurable interoperability of wireless communication systems, RIWCoS. The next step of our work will be the implementation of concrete media dependent modules following the proposed approach, and their integration into the overall system.

Considerations over implementing IEEE 802.21 on a device powered by a mobile operating system

During the last years, software applications performing scenarios related to vertical handovers were revealed. However, the great majority of these demonstrators were designed and optimized for multimode notebooks, having a fair amount of processing power. This article aims to describe on how to implement and optimize the main components of the IEEE 802.21 standard on a device like a smartphone powered by a mobile operating system. Performance evaluations were made in this purpose showing reasonable delays, taking us one step closer to achieving a seamless vertical handover on a mobile terminal.

Heterogeneous wireless access networks analysis from simulation to implementation

The effects of the coexistence of different wireless access technologies in the same area are not very easy to be evaluated and analysed. If these different networks interact with each other and form a heterogeneous wireless network, the analysis becomes even more difficult. Different approaches are possible: to build a pilot heterogeneous network (but, if new technologies or, at least, existing technologies with new interoperability capabilities are being used, this implies implementing new blocks), to simulate one using an adequate simulation tool or to emulate some of the new blocks or network sections and to interconnect them with a real network from an existing technology. The present paper intends to investigate some of the difficulties and some of the advantages of these approaches and to illustrate them with the methods used in the RIWCoS and SAWHAU projects.