This paper analyzes a discrete-time $Geo/Geo/c$ queueing system with multiple working vacations and reneging in which customers arrive according to a geometric process. As soon as the system gets empty, the servers go to a working vacations all together. The service times during regular busy period, working vacation period and vacation times are assumed to be geometrically distributed. Customer...

We propose a ow-control scheme that combines the merits of credit-and rate-based ow-control schemes by applying direct control over both bandwidth and buuer resources. The goal of the proposed scheme is to design an optimal rate-control policy for a given nite buuer capacity that maximizes average throughput and bounds end-to-end delay. By applying higher-order rate control, the proposed scheme...

Service aggregation schemes like batching, caching and rate adaptation can enable large scale interactive multimedia services, such as movies-on-demand and popular television programming. These applications are characterized by a large user population and a high density of access. Rate Adaptation is a dynamic service aggregation technique that can merge streams and reclaim resources at run-time...

Feedback control is the essential building block of many internet services. The performance controller act as the basic example in the web server. It adjusts the server’s configuration inn response to alteration between the current and desired states for meeting expected performance. Feedback control act as a crucial element in the QoS software. Low Rate Denial of Service is the attack where th...

– When we speak about the buffer overflow period we mean the time interval in which the queue size is equal to the capacity of the buffer. Thus packets or cells arriving during this period are lost. The distribution of the length of this interval is recently gaining attention as a very informative characteristic of the queueing performance. In this paper the numerous results related to the dist...

We describe proposed enhancements to the ATM Unspeciied Bit Rate (UBR) service that guarantee a minimum rate at the frame level to the UBR VCs. These enhancements have been called Guaranteed Frame Rate (GFR). In this paper, we discuss the motivation, design and implementation issues for GFR. We present the design of buuer management and policing mechanisms to implement GFR. We study the eeects ...

In this paper we propose a scheme referred to as dualrate session grouping to improve the service rate granularity for cell-based schedulers. In this scheme a session is split into two subsessions to provide the average service rate that a user requires. By applying dual-rate session grouping, the utilization of bandwidth and fairness among users can be improved, while the complexity of the sch...

A novel concept in available bit rate (ABR) service model as de ned by the ATM Forum is the minimum cell rate (MCR) support for each ABR virtual connection. In this paper, we present a fundamental study of rate allocation policies with MCR guarantee. In particular, we de ne three network bandwidth allocation policies that guarantee MCR requirements. For each policy, we present a centralized alg...

We describe proposed enhancements to the ATM Unspeci ed Bit Rate (UBR) service that guarantee a minimum rate at the frame level to the UBR VCs. These enhancements have been called Guaranteed Frame Rate (GFR). In this paper, we discuss the motivation, design and implementation issues for GFR. We present the design of bu er management and policing mechanisms to implement GFR. We study the e ects ...