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Call admission control is an essential approach for traffic control and QoS provisioning. Compared with the single network, it is quite complicate for multi-service heterogeneous wireless networks. In this paper, a hierarchical joint call admission control HJCAC is proposed. The framework of the scheme, new introduced messages format and service access procedure is also designed in this paper. Simulation...
This paper provides a complete study on the end-to-end performance of multi-hop wireless communication systems equipped with re-generative (decode-and-forward) relays over Rayleigh fading channels assuming single-antenna terminals. More specifically, the probability density function (pdf) of the tightly approximated end-to-end SNR of the systems is derived. Using this approximation allows us to avoid...
Multi-hop relaying has proven to be an effective method of additional spatial diversity on wireless fading channels. This paper propose and analyze a simple technique that Cooperative Transmit Diversity (CTD) can be applicable to multi-hop relay enhanced diversity order to fading relay channels, and furthermore the system using X-OR with STBC half encoding at the relay that offers increased performance...
In recent years, the study of new network architectures has defined a clear trend towards using IP end-to-end. One of the most important issues for these types of all-IP networks is how to provide quality of service guarantees while a user is moving in wireless networks. The quality of service may degrade due to insufficient resources in the air links of any of the calling parties. In 3G cellular...
Wireless Mesh Networks (WMNs) have been expected to be future commercial service-grade networks. OAM (Operations, Administration, and Maintenance) in wired networks is an important tool to guarantee a reliable network performance, WMNs needs such a tool to meet the service providers requirements, and to handle mobility problem. We propose a fundamental architecture of wireless mesh network OAM to...
Real-time position localization of moving objects in an indoor environment is an encouraging technology for realizing the vision of creating numerous novel location-aware services and applications in various market segments. Increasing the accuracy of these location tracking systems will increase their usefulness. An off the shelf development platform that uses radio signal strength indication (RSSI)...
A mobile ad-hoc network (MANET) is a collection of mobile nodes which communicate over radio. These kinds of networks are very flexible, thus they do not require any existing infrastructure or central administration. Therefore, mobile ad-hoc networks are suitable for temporary communication links. The biggest challenge in this kind of networks is to find a path between the communication end points,...
Wireless mesh networks have been studied as the next generation technology to solve problems of conventional wireless networks. Particularly, mobile WiMAX based wireless mesh networks are noticed due to many advantages. In this paper, we propose a layer-2 handover scheme for mobile WiMAX based wireless mesh networks. A layer-2 handover scheme based on mobile WiMAX causes many handover failures over...
Wireless Mesh Networks (WMN), this term was coined few years back in network research community. Due to its profound applicability, highly reliable connectivity, easy deployment, flexible interoperability with other networks drew much attention even within this short time. Although, lot of work is going on in this field but still issues like privacy and trust are left unattended. This paper address...
The hello protocol using a periodical HELLO packet broadcast is a fundamental protocol for neighbor discovery in wire and wireless networks. It explicitly doesn't take into account the loss of HELLO packet caused by interferences and collisions in the link layer. The loss of HELLO packet results in three problems: unidirectional link, the subset of neighbors and inaccuracy of neighbors. To solve the...
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