Béla Almási

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This paper deals with a retrial queueing system with a finite number of homogeneous sources of calls and a single non-reliable server, which means that the server is subject to random breakdowns depending on whether it is busy or idle. The failure of the server may block or unblock the systems's operations and the service of the interrupted request may be(More)
—The currently used IPv4 and IPv6 communication technology uses a single endpoint interface in a given communication session, even in the case when the device have many interfaces. In this paper we introduce a software library (named as MPT), which opens the possibility to use multiple interfaces (and multiple paths) in one communication session. There is(More)
—In this paper we introduce a finite source retrial queueing model to investigate the performance characteristics of the wireless transmission problem in sensor networks. We divide the sensors into two classes. The first one is the " Emergency " class, which performs the notification of special emergency situations (eg. fire alarms). The second one is the "(More)
The currently used standard Internet communication is restricted to use a single path between the endpoints in a communication session. In the January of 2013 the Multipath TCP technology was established by IETF in order to open the possibility of the multiple path usage. Performance measurements proof that MPTCP efficiently aggregates the paths'(More)
The main aim of the present paper is to investigate the wireless transmission problem in sensor networks. We investigate a generalized model for the performance evaluation of wireless sensor networks. In order to study the performance measures and characteristics, a finite source retrial queueing model is introduced. The main goal is to investigate the(More)
This paper deals with wireless transmission problems in sensor networks. In order to study the performance measures and characteristics, a finite source retrial queueing model is introduced. Two classes of sensors are considered: "time driven" sensors for normal requests and "event driven" sensors with high priority for special, eg. emergency requests. The(More)