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)
Although the currently used mobile communication equipments (laptops, tablets, phones) usually have many network interfaces, the Internet communication technology uses only a single communication path for a connection. In this paper we would like to introduce a new architecture, which gives an easy-to-use extension for the current TCP/IP protocol stack and(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 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)
The Internet Protocol (both IPv4 and IPv6) technology uses the IP address of the network interface as the identification of the communication session. The consequence of this idea is that the breakdown of the interface will also stop the communication session, even when other network interface cards would be available for the communication. Many of the(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(More)
Queueing models are widely used to establish stochastic models for QoS analysis of different communication environments. In [1] the authors created a queueing model to evaluate a sensor network environment with two quality classes of sources. The " Emergency " class represents the sources of very important communication (e.g. fire alarm), and the " Normal "(More)