00000cab a22000003a 4500 UP-99796217609350777 Buklod 20231007234447.0 m |o d | ta 100622s xx d | ||r ||||| || DENGII eng Sobrinho, J.L. Quality-of-service in ad hoc carrier sense multiple access wireless networks. pp. 1353-1368 Carrier sense multiple access (CSMA) is one of the most pervasive medium access control (MAC) schemes in ad hoc, wireless networks. However, CSMA and its current variants do not provide quality-of-service (QoS) guarantees for real-time traffic support. This paper presents and studies black-burst (BB) contention, which is a distributed MAC scheme that provides QoS real-time access to ad hoc CSMA wireless networks. With this scheme, real-time nodes contend for access to the channel with pulses of energy-so called BBs-the durations of which are a function of the delay incurred by the nodes until the channel became idle. It is shown that real-time packets are not subject to collisions and that they have access priority over data packets. When operated in an ad hoc wireless LAN, BB contention further guarantees bounded and typically very small real-time delays. The performance of the network can approach that attained under ideal time division multiplexing (TDM) via a distributed algorithm that groups real-time packet transmissions into chains. A general analysis of BB contention is given, contemplating several modes of operation. The analysis provides conditions for the scheme to be stable. Its results are complemented with simulations that evaluate the performance of an ad hoc wireless LAN with a mixed population of data and real-time nodes CSMA. QoS guarantees. TDM. Ad hoc wireless LAN. Ad hoc wireless networks. Black-burst contention. Carrier sense multiple access. Data nodes. Data packets. Distributed MAC scheme. Distributed algorithm. Medium access control. Network performance. Quality-of-service. Real-time delays. Real-time nodes. Real-time packet transmissions. Real-time packets. Real-time traffic support. Simulations. Time division multiplexing. IEEE Journal on selected areas in communications 17, 8 (1999). FO UPD DENG-II Article