Ivan Ganchev

Policy based networking in the integration effort of 4G networks and services

We present system integration requirements and provide a new framework to support the integration of 4G networks and services. This framework uses a policy based networking concept in order to provide the unified control in the oncoming 4G networks and services. We also provide an analysis of the candidate signaling protocols in this framework. Two approaches are described: i) the unified QoS, mobility, and security signaling and ii) the heterogeneous QoS, mobility, and security signaling. In addition, we introduce user, terminal, network and service profiles and management in order to provide a user centric approach and consider different user, terminal, network, and service constraints in order to better adapt the user service as well as the network configuration to these constraints. Finally, we give a short estimation on the composition of exchanged signaling data with respect to the aspired level of integration.

Fuzzy PID control of nonlinear plants

It is difficult to achieve efficient control of time variable and nonlinear plants with conventional PID controllers. A method of designing a nonlinear fuzzy PID controller is presented. The nonlinear fuzzy PID controller could be applied successfully in control systems with various nonlinearities. The fuzzy PID controller can be viewed as a natural similarity to the conventional PID controller. This paper describes the structure and the design aspects of a fuzzy PID controller based on Sugeonos fuzzy technique with fuzzy-neural implementation. There are two possibilities to obtain a three-term fuzzy PID controller similar to the conventional digital PID controller. The first one is a velocity type fuzzy PID controller and the second one is the positioning type fuzzy PID controller. The antecedent part of the applied fuzzy rules contains a linear function, similar to the discrete equation of the corresponding conventional PID controller. The paper contains the structure and description of this implementation as well as investigations toward the applied fuzzy PID control algorithms. The simulations demonstrate satisfactory results of these performances and implementations applied to a nonlinear plant composed by two cascaded water tanks with level control.

The creation of a ubiquitous consumer wireless world through strategic ITU-T standardization

The theme of this article is a proposed global wireless communications environment - ubiquitous consumer wireless world - enabled through the strategic creation of International Telecommunication Union standards. Specifics include new consumer identity module cards, new network- independent and location-independent personal IPv6 addresses, new protocol and interface infrastructures underpinning trusted third-party authentication, authorization, and accounting services, and new consumer-oriented incoming call connection services.

An InfoStation-Based Multi-Agent System Supporting Intelligent Mobile Services Across a University Campus

This paper presents an InfoStation-based multi-agent system, which provides mobile services (mServices) across a University Campus. A description of some of the mServices along with sample interactions among entities is provided. Technologies for delivering of these services are discussed and approaches for the system implementation and structuring are considered.

Enabling technologies for the 'Always Best Connected' concept

‘Always Best Connected’ (ABC) is considered one of the main requirements for next generation networks. The ABC concept allows a person to have access to applications using the devices and network technologies that best suits his or her needs or profile at any time. Clearly, this requires the combination of a set of existing and new technologies, at all levels of the protocol stack, into one integrated system. In this paper, a considerable set of the technologies, that are expected to play a key role towards the ABC vision, are presented. Starting from a reference architecture, the paper describes the required enhancements at certain levels of a traditional protocol stack, as well as technologies for mobility and end-to-end Quality of Service (QoS) support. The paper concludes with a case study that reveals the advantages of the ABC concept. This article replaces a previously published version (Wireless Communications and Mobile Computing; 5(2): 175-191. [DOI: 10.1002/wcm.207]). Retraction notice DOI: 10.1002/wcm.426. Copyright

Requirements for an integrated system and service 4G architecture

The emerging 4G networks intend to provide a variety of adaptable services to mobile and nomadic users by using an integrated heterogeneous network infrastructure. The commonalities and differences among the various approaches in the integration of 4G systems and services are identified on the basis of an analysis of the research done by well-known international projects. Building on these and other ideas, the requirements for an integrated system and service 4G architecture are defined. Considerations and ideas discussed include AAA functions, network system management, end-to-end QoS negotiation and support, mobility management, adaptability and reconfigurability, support for multiple communication modes, ABC&S, service and access network advertisement, discovery and association, wireless billboard channel, and security and privacy challenges.

Strategic innovations through NGN standardisation for a Ubiquitous Consumer Wireless World

This paper proposes strategic innovations through NGN standardisation to enable the establishment of a consumer-centric business model (CBM) for wireless services. This leads to the evolution of a wireless environment, called here a ubiquitous consumer wireless world (UCWW). In view of the novelty of the concept, the paper focuses on developing the context and argument for the CBM, and the underpinning technological innovations - key new infrastructural entities and functionalities - required for its realisation. The technological innovations proposed may be evolutionary, but considering the potential social, economic and policy impact on wireless communications equipment, service providers and users, the effect may be described as revolutionary.

Mobile distributed e-learning center

The development of a mobile distributed e-learning center (DeLC) with enhanced functionality, including two pilot mobile services, is described. Some DeLC re-engineering approaches to enhance the m-learning/m-teaching facilities available in a university campus are considered.

Performance evaluation of 'WBC over DVB-H' system

Wireless billboard channels (WBCs) are fundamental to the consumer-centric business model (CBM) of the new emerging ubiquitous consumer wireless world (UCWW). They were introduced as instruments to facilitate service advertisement, discovery and association (ADA). A WBC three-layer model, a set of efficient algorithms and a software testbed for WBC over digital video broadcast - handheld (DVB-H), is set out in this paper. With the proposed end-to-end novel solution, the service advertisements can be broadcast on WBC in an efficient and intelligent way.

Reliable and efficient Advertisements Delivery Protocol for use on Wireless Billboard Channels

This paper proposes a novel, reliable and efficient advertisements delivery protocol (ADP) for use in unidirectional wireless billboard channels (WBCs) for IP datacasting (lPDC). The ADP is based on a modified asynchronous layered coding (ALC) protocol and uses a forward error correction (FEC) with Reed-Solomon (RS) coding to guarantee packet-level reliable data broadcasting. The ADP implementation is presented. The ADP performance is evaluated and compared to similar existing protocols. The results show that in addition to being less complex and producing less overhead, the ADP is more efficient in terms of the encoding/decoding speed achieved.