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Femtocells are an inexpensive solution to address weak indoor cellular coverage. Femtocells increase network coverage, offloaded macro cell sites, and provide high data rate services in a cost-effective manner. However, several aspects of this new technology are ambiguous or not defined in standard, such as QoS architecture, bandwidth request management and subscribers flows priority. This paper provides...
Due to the AMC (Adaptive Modulation and Coding) mechanism adopted in the 802.16e physical layer, each connection's spectrum requirements depend on its SNR (Signal-to-Noise Ratio). Meanwhile, according to the OFDMA functionality, the limited transmission power of every terminal is divided among the simultaneously allocated subcarriers, i.e. a terminal's uplink SNR is reversely proportional to the number...
Frequency is amongst the most exclusive and most costly resources in wireless communication networks, especially, while considering the demands of broadband wireless access (BWA). In BWA, the management of frequency distribution and its effective utilization is of utmost importance. This research explores possible ways to ensure the most effective allocation of bandwidth resources and their best possible...
IEEE 802.16 is a promising technology in broadband wireless access area. In multiservice IEEE 802.16 network, connection admission control (CAC) plays a critical role for resource management and QoS guarantee. In this paper, a statistical CAC mechanism is proposed for IEEE 802.16 network. In order to avoid the QoS degradation, the proposed CAC mechanism considers the traffic variability and overflow...
WiMAX technology is a good candidate to provide broadcast TV services for mobile users because it supports QoS based multicasting functionality. To provide multicast-based TV services over the mobile WiMAX network, a multicast session setup involves both MAC-layer and IP-layer multicast management. However, in mobile environment, IP-layer multicast management entails service interruption due to unreliable...
The adaptive network selection, efficient resource management, call admission control (CAC) strategies in mobile WiMAX must consider the characteristic of multi-rate to reduce the call blocking probability (CBP) and call dropping probability (CDP). In this paper, we propose a hierarchical network selection strategy (HNSS) based on grey relational analysis (GRA) to switch to the proper base station...
In an environment where IEEE 802.16 access networks are used as a backbone for a heterogeneous wireless access network, the question of Quality of Service brings along a questioning on several other aspects: scalability, guarantees, scheduling among others. We give in this paper a general solution answering those questions. This solution is based on an aggregated bandwidth management in the backbone...
A dramatic challenge of the remote, rural, and difficult for access (RRD) areas is the critical discrepancy of the modern 3G/4G communications centralized architecture with respect to the fully distributed topology of the RRD data streams. In this paper, we systematize the fundamental principles of the new QoS-aware radically distributed (grid-like) multifunctional multiple access control to long-delay...
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