In examination timetabling we have to assign the exams of a given set of courses to time slots, such that conflicting exams are assigned to different time slots. We study the problem that occurs at our department. The characteristics of this problem are as follows. The exams have to take place in 5 days, and per day there are 2 time slots. Teachers can express their preferences for the time slo...

This paper proposes a new MAC protocol, called request-TDMA/CDMA protocol, for supporting multimedia traffic in wireless networks. The protocol has CDMA laid over TDMA like frame structure which has two kinds of slots, viz., data slots and control slots. The control slot holds the information of the next frame’s data slot allocation. Whenever a mobile terminal needs to transmit a message, it se...

Popular fault-tolerant TDMA-based protocols like TT-CAN ([Fu00] and [Mu02]), TTP ([KG93]) and FlexRay ([Fl02]) are using a static slotting scheme for bus arbitration. This paper describes a possible solution for a more flexible handling of the slotting, by providing extra time of variable length in the cycle for additional slots. These extra time is only provided if it is requested by the contr...

Radio Frequency Identiication (RFID) systems have emerged as a viable and aaordable alternative for tagging and/or labeling small to large quantities of items. The arbitration problem is that of identifying alìtags' present in the current environment (i.e reading the labels). This is a multiaccess communication problem in which contention for the communication medium is transient in nature. Imp...

Neighbor discovery and the power of sensors play an important role in the formation of Wireless Sensor Networks (WSNs) and mobile networks. Many asynchronous protocols based on wake-up time scheduling have been proposed to enable neighbor discovery among neighboring nodes for the energy saving, especially in the difficulty of clock synchronization. However, existing researches are divided two p...

The contention-free policy has received attention in real-time multiprocessor scheduling owing to its wide applicability and significant improvement in offline schedulability guarantees. Utilizing the notion of contention-free slots in which the number of active jobs is smaller than or equal to the number of processors, the policy improves the schedulability by offloading executions in contendi...

Folded slots are attractive for active arrays because of their broad bandwidth and simplicity. They have been used recently in a quasi-optical amplifier array. However, little is known about these antennas on thin substrates. The finite-difference time-domain (FDTD) method is applied to the analysis of cpw-fed folded-slot antennas. This paper compares the theoretical results and measured data a...

Internet of Things (IoT) and mobile edge computing (MEC) architectures are common in real-time application scenarios for improving the reliability service responses. Energy conservation (EC) energy harvesting (EH) significant concerns such due to self-sustainable devices resource-constraint nodes. The density users requirements further reasons need these scenarios. This article proposes decisiv...

channel is busy idle slots idle slots This paper analyzes the performance of IEEE 802.11 MAC protocol under a disaster scenario. The performance is measured in terms of the recovery time and the throughput of the protocol when a network disaster occurs. To make the problem amenable to analysis, some approximations are used, and a new technique to collapse a very large state space is introduced....