Although the IEEE 802.16 standard defines five service levels to support real-time and bandwidth demanding applications, admission control and scheduling mechanisms are not specified in the standard. This paper introduces an uplink scheduling algorithm and an admission control policy for IEEE 802.16 networks. The proposed solution is fully standardcompliant and can be easily implemented in the base station. Simulation results show that this solution is able to meet the QoS requirements of multimedia applications.

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This paper introduces admission control policies for WiMAX networks, which aim to reach three main goals: restrict the number of simultaneous connections in the system so that the resources available for the uplink scheduler are sufficient to guarantee the quality‐of‐service requirements for each connection, support the service provider expectations by maximizing the revenue, and maximize user satisfaction by granting additional resources. The optimal solution to meet these goals is non‐deterministic polynomial‐time hard and therefore cannot be solved in acceptable polynomial time. For this reason, both optimal and polynomial time heuristic solutions are introduced. Simulation experiments are used to evaluate and compare the proposed policies. Copyright © 2012 John Wiley & Sons, Ltd.

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In the near future, many areas will need at least a basic knowledge of computer science. Nonetheless, studies have shown that professors are currently having trouble teaching those same concepts in universities. In consequence, the idea of introducing programming theory to children is trending. This article presents a game that provides problems for the user to solve using blocks. The game targets the six to eleven age range, although it supports other ages as well. User trials affected the product through the development phase, changing user interaction and game design. A few children have already tested the final product and the results were positive: the tool was regarded as being fun, educational, and engaging.