Burstiness property plays an important role in the variable bit rate (VBR) video traffic. One of the most significant issues in providing quality-of-service (QoS) guarantees for the real-time multimedia communications in a highspeed network is to estimate the burstiness accurately. In this paper, an efficient burstiness estimation model (Fractal exponent model) for VBR video stream is proposed....

The major issue related to the realization of wireless multimedia system is the design of suitable medium access control (MAC) protocol. The design challenge is to maximize the utilization of the limited wireless resources while guaranteeing the various quality of service (QoS) requirements for all traffic classes especially for the stringent real-time constraint of real time variable bit rate ...

We consider streaming of video sequences over both, constant and variable bitrate channels. Our goal is to enable decoding of each video unit before exceeding its displaying deadline and, hence, to guarantee successful sequence presentation even if the media rate does not match the channel rate. In this work, we will show that the separation between a delay jitter buffer and a decoder buffer is...

The broadband networks inhibit the capability to carry multiple types of traffic – voice, video and data, but these services need to be controlled according to the traffic contract negotiated at the time of the connection to maintain desired Quality of service. Such control techniques use traffic descriptors to evaluate its performance and effectiveness. In case of Variable Bit Rate (VBR) servi...

Multimedia applications like Video on Demand (VoD), Distance Learning, Internet Video Broadcast, etc., will play a fundamental role in future broadband networks. A common aspect of such applications is the transmission of video streams that require a sustained relatively high bandwidth with stringent requirements of Quality of Service (QoS). In this paper various original algorithms for evaluat...

The multiple access control (MAC) problem in a wireless network has intrigued researchers for years. For a broadband wireless multimedia network such as wireless ATM, an effective MAC protocol is very much desired because efficient allocation of channel bandwidth is imperative in accommodating a large user population with satisfactory quality of service. Indeed, MAC protocols for a wireless ATM...

In this paper, we address the Authenticated Key Agreement(AKA) between actor and sensor nodes in Wireless Sensor and Actor Network (WSAN). We propose DoS-resilient AKA scheme between Actor and Sensor nodes in WSAN. The proposed scheme utilizes the IDbased cyrptosystem to reduce a need to transmit public-key certificates. The proposed scheme is resilient against the Denial of Service (DoS) attac...

In this work, the region of achievable QoS-which is central to the development of a call admission control mechanism-is precisely described for a system of heterogeneous VBR sources with real-time service constraints. The QoS for each application is deened in terms of a packet dropping probability. Packets may be dropped due to delay violations and channel induced errors. The shared transmissio...

Useful security properties arise from sealing data to specific units of code. Modern processors featuring Intel’s TXT and AMD’s SVM achieve this by a process of measured and protected execution. Only code which has the correct measurement can access the data, and this code runs in an environment protected from observation and interference. We present a modelling language with primitives for pro...

We consider the admission control problem in video servers for the retrieval of media data from disk storage. We assume that the I/O bandwidth of the server disk is limited. Given a certain I/O bandwidth, admission control decides whether or not a new client can be accepted without affecting the quality of service promised to the already admitted clients. Assuming variable bit rate (VBR) video ...