Mehmet Ulema

Architecture for interworking data over PCS

This article presents a new approach for wireless service providers to offer data services by taking advantage of the existing infrastructure for voice services and interworking with existing wireline-based data services. The article presents a framework: for interworking between any wireless radio system and any data application on the wireline network. The interworking is provided by a common interworking function that uses a generic interworking control protocol (ICP). Any radio system capable of using the ISDN-based C-interface and implementing ICP can take advantage of the proposed approach. ICP is a generic protocol and can be implemented using different networks. The article considers an ISDN network for the lower-layer transport of ICP. Though the article focuses on interworking with the PSTN and the Internet, the architecture also allows access to other data networks.

Wireless sensor networks: architectures, protocols, and management

Summary form only given. Wireless sensor networks are examples of the paradigm shift taking place in wireless network architectures. A wireless sensor network consists of large numbers of sensors, which are tiny, low-cost, low-power radio devices dedicated to performing certain functions such as collecting various environmental data and sending them to infrastructure processing nodes. The field of wireless sensor networking is also gaining greater interest among not only researchers but also diverse groups such as environmental, public safety, medicine, and military. This tutorial starts with an overview of the wireless sensor networks. A review of the current technologies used for these types of wireless networks is provided next. The focus is on the architectural issues such as topology, routing, and protocols. Finally, the network management issues related to wireless sensor networks are discussed. The tutorial concludes with a discussion of the open research problems in this area.

Management of Wireless Ad Hoc Networks and Wireless Sensor Networks

A real revolution is taking place in wireless networking. With fundamentally different architectures and services, Wireless Ad hoc networks (WAHNs) and Wireless Sensor Networks (WSNs) are two leaders in this revolution. These networks will be the enablers for ubiquitous computing and communications. These new networks will be autonomously formed and will include large numbers of nodes (PDAs, laptops, sensors, etc.) with varying functionalities and power levels. Given that WSNs and WAHNs will be dominant networks in not so distant future, what are the challenges for managing these complex and dynamic environments? This special issue includes articles describing the results of the latest work in management of WSNs and WAHNs. In this article, we first provide a brief overview of WAHNs and WSNs. Then we discuss the challenges introduced by these networks, and finally we introduce the papers selected for this special issue.

Research & standards: advanced cloud & virtualization techniques for 5G networks [Guest Editorial]

The evolution of mobile network architecture is an essential part in the development process of the fifth generation (5G) of cellular mobile systems, and that is through the incorporation of advanced cloud technologies and network function virtualization techniques. The new network architecture needs to support a wide range of high data rate applications and services, offering capacities of up to multiple gigabits per second, yet meeting extremely stringent latency and reliability requirements under a diverse variety of scenarios. Thus the automation of network control and overall system management to achieve such an ambitious set of performance targets became crucial. Significant global effort for the necessary new technologies has been initiated.

Pervasive Management for Ubiquitous Networks and Services--Report on NOMS 2008

The 11th IEEE/IFIP Network Operations and Management Symposium (NOMS 2008), the 20th anniversary edition of the NOMS, was held on 7–11 April 2008 in the exciting and lively city of Salvador-Bahia-Brazil. Since 1988, NOMS, which is held in even-numbered years, follows the tradition of its sister symposium IM (IFIP/ IEEE International Symposium on Integrated Network Management) as the primary forum for technical exchange among all constituencies, including the research, vendor, standards, development, systems integration, service provider, and user communities, and many others.

Multimedia communication in cellular PACS network

A novel application on the recently emerging Personal Communication Services (PCS) networks is the multimedia communication. In this paper; we evaluate multimedia communications capability of one of the PCS standards, Personal Access Communications System’s (PACS) packet channel (PPC) using simulation modeling. The performance of PPC’s slot aggregation and data-sense multiple access techniques are studied by considering the downlii and uplink in a single cell and combined uplink/ downhnk in two cells and changing various parameters such as the number of users and certain protocol parameters. Interconnection of PPC with the Internet is discussed next. Frame rates of MPEG-1 coded images transmitted in a PACS cell as IP datagrams are determined. Handover characteristics of PPC downlink are studied by changing different parameters such as the cell size, the speed of the mobile host and time between handovers. The results clearly establish that multimedia communication on PPC is only feasible at lower bandwidths and frame rates and only a few users per cell can be supported. Careful tuning of PPC protocol parameters are required. There is one parameter whose variation gives opposite results on the downlink and uplink.

A framework for personal mobile agents in wireless pervasive computing environment

We propose a framework architecture for a personal mobile agent that can be used in a wireless pervasive computing environment to help the user to access the relevant information/services. Challenges and approaches for making mobile agents functional in this type of environment are discussed. Primary focus of the paper is in maintaining and using models of the user, environment, and other agents. Also covered are the performance and security related areas.

A new anchor radio system handover method for personal access communications system (PACS)

This paper introduces a new handoff method, known as the anchor radio system (RS) method, for the personal access communications system (PACS). This technique facilitates the inter-RS and inter-switch handovers. This method of handover relies on a new RS-to-RS interface, named the inter-RS interface (IRI). This paper describes the use of the IRI protocol among PACS based RSs. This anchor RS method for handoff provides a simple yet effective solution without adding new requirements to the existing network infrastructures.

Next generation service overlay networks (NGSON) [Guest editorial]

This feature topic presents a set of articles discussing various aspects of next-generation service overlay networks as well as the status of standardization effort in this area. Next generation service overlay network (NGSON) is the official name for the related standardization effort under IEEE Project 1903.

IP multimedia systems infrastructure and services [Guest Editorial]

This special section is intended to address challenges at the infrastructure and service levels. More specifically, the six articles address the IMS architecture and interoperability issues, and provide real deployment examples.