Performance Investigation of Wireless LAN with Variable Channel Width

Today, mostly the wireless LAN is based on preset static channel widths. Considering unique benefits of adapting channel width, which is a fundamental yet under-explored facet in wireless communication, We carried out investigations on the performance of suggested scenario, which are based on IEEE 802.11 and composed of different number of nodes with different channel width (10MHz, 20 MHz and 40 MHz) associated to one AP. This research work makes a strong case for wireless systems that adapt channel width in WLAN. Adapting channel width offers rich possibilities for improving system performance. This thesis provides an outlook of the aforementioned issues associated with wireless communication for instance, fairness problem among users associated to same AP and hidden terminal problem. Some issues are investigated and analyzed with Matlab tool. We found that the variable channel width increases the range of communication, providing the users with the required spectrum, which offers a natural way to both improve flow fairness and balance the load across the APs. Also the increase in channel width increases the throughput of suggested scenario compare to the fixed channel width. In our future work, we also provide possible solutions to the new problems in WLAN with variable channel width

Efficient Handoff for QoS Enhancement in Heterogeneous Wireless Networks (UMTS/WLAN Interworking)

Today’s Wireless Communications technologies prove us that wireless communications will in the long run be composed of different communication networks as a way to benefit from each other. This can however be achieved from cellular networks and wireless local area networks that show some compatible characteristics that enable them be integrated. Scenarios typically behind these integrations is the UMTS and WLAN interworking where UMTS network is known for its wide area of coverage and nearly roaming however, known for lack of enough data rate. This is contrary with WLAN which is known for high data rate and cheaper compared to UMTS. WLAN however has a small area of coverage and lacks roaming. This in regard brings the idea that the two different networks being integrated could provide the means for mobile users to be gratified with a supported coverage and quality at anywhere and anytime with seamless access to internet

Efficient Handoff for QoS Enhancement in Heterogeneous Wireless Networks (UMTS/WLAN Interworking)

Today s Wireless Communications technologies prove us that wireless communications will in the long run be composed of different communication networks as a way to benefit from each other This can however be achieved from cellular networks and wireless local area networks that show some compatible characteristics that enable them be integrated Scenarios typically behind these integrations is the UMTS and WLAN interworking where UMTS network is known for its wide area of coverage and nearly roaming however known for lack of enough data rate This is contrary with WLAN which is known for high data rate and cheaper compared to UMTS WLAN however has a small area of coverage and lacks roaming This in regard brings the idea that the two different networks being integrated could provide the means for mobile users to be gratified with a supported coverage and quality at anywhere and anytime with seamless access to interne

TRENDS IN INFORMATION TECHNOLOGY MANAGEMENT

The paper presents an analytical exposition, critical context and integrative conclusion on the trends and best practices in Information Technology Management, and reviews and evaluates the key issues, trends and future direction of Modern Information Technology Management. IT is generally accepted as a key enabler of economic and technological growth. Managers implement new technology to change something: the organization, the nature of work, relationships with other organizations, or some other facet of business. Information Technology (IT) plays a vital role in leveraging productivity and efficiency in private organizations, governments and research. The value of IT in any organization depends on its infrastructure, which consists of computers, network and telecommunication technologies, data and core software applications. Information Technology (IT) is now a force and driver of modern technological development and globalization, and makes the management of information more efficient and effective. Technology management entails all management activities that determine the application of policy, objectives and responsibilities as well as their execution in an organization in terms of planning, allocating resources, organizing and ensuring outcomes that improve processes. The major IT Management issues are: Using technology to design efficient and effective organizations; Developing a plan for information technology in the organization; Using IT as a part of corporate strategy; Taking advantage of interorganizational systems; Deciding on and developing new applications of IT; Reengineering business processes; Adopting special applications; Changing the organization; Managing the IT infrastructure in a time of explosive growth and technological change; Deciding whether and what to outsource;  and Deciding how much to invest in IT. Knowledge and skills are a necessary and sufficient condition for technological progress. Developing countries lack enough skilled IT persons who can design, program, install, configure and maintain Information Technology in this constantly changing industry. Accordingly, lack of qualified and globally recognized IT professionals is seriously hampering IT adoption and development. Management Information Systems refer to information management methods tied to the automation or support of human decision making, whereas IT Management refers to the IT related management activities in organizations

AN AUTHENTICATION FOR GROUP COMMUNICATIONS IN AD-HOC NETWORKS

Group communication implies a many-to-many communication and it goes beyond both one-to-one communication (i.e., unicast) and one-to-many communication (i.e., multicast). Unlike most user authentication protocols that authenticate a single user each time, we propose a new type of authentication, called group authentication that authenticates all users in a group at once. The group authentication protocol is specially designed to support group communications. There is a group manager who is responsible to manage the group communication. During registration, each user of a group obtains an unique token from the group manager. Users present their tokens to determine whether they all belong to the same group or not. The group authentication protocol allows users to reuse their tokens without compromising the security of tokens. In addition, the group authentication can protect the identity of each user