We study the problem of QoS guarantee for di erentiated services. A two-level hierarchical scheduling framework is deployed for the separation of the QoS metrics. Due to the desirable property of minimizing the maximum packet lateness, the Earliest Deadline First (EDF) scheduling is adopted to provide the in-class scheduling for the time-sensitive traÆc. We propose to employ an EDF scheduler co...

Several methods have been developed for determining fixed priority configurations on uniprocessor. In this paper, we present a new method, called PFX, for determining fixed priority configurations on multiprocessor. PFX follows an offline approach: our constructive process uses an inductive analysis of the whole set of possibilities. Therefore, PFX provides all valid fixed priority configuratio...

WiMAX, Worldwide Interoperability for Microwave Access, is a developing wireless communication scheme that can provide broadband access to large-scale coverage. WiMAX belongs to the family of standards of IEEE-802.16. To satisfy user demands and support a new set of real time services and applications, a realistic and dynamic resource allocation algorithm is mandatory. One of the most efficient...

Multiprocessor scheduling in real time systems follows global queue and partitioned queue methods. Partitioned queue scheduling technique organised with dedicated queues and tasks are scheduled to corresponding processor, based on Earliest Deadline First (EDF) algorithm. EDF is an optimal technique to schedule aperiodic, periodic and sporadic tasks in Real Time Systems (RTS). Deadline of the ta...

The Earliest Deadline First (EDF) scheduling algorithm is known to be suboptimal for meeting all deadlines under global scheduling on multiprocessor platforms. However, EDF is an attractive choice for scheduling soft-real-time systems on multiprocessors. Previous work has demonstrated that the maximum tardiness is bounded, and has derived formulas for computing tardiness bounds, in EDF-schedule...

Deadlines are the most important events in real-time systems. Realtime programs must therefore be aware of deadlines, and be able to identify and react to missed deadlines. Moreover, Earliest Deadline First (EDF) is the most widely studied optimal dynamic scheduling algorithm for uniprocessor real-time systems. In this paper we explore how a resource sharing protocol (called the DFP – Deadline ...

In this paper a new non-preemptive domain clustering scheduling algorithm for soft real time application is proposed. The main aim of this algorithm is to achieve high deadline meeting ratio of the group Earliest Deadline First (gEDF) algorithm by maintaining the excellent performance during normal load. An efficient non-preemptive algorithm called Domain Cluster – group EDF (DC-gEDF) is propos...

Scheduling is an important factor for the performance of Wimax system, especially for real-time applications. Earliest Deadline First (EDF) is a delay-optimal scheduling discipline commonly used in real-time applications in wired and wireless networks. Traditional schedulers like EDF do not take the packet destination distance into account. In this paper, we present a scheme that differentiates...

Earliest Deadline First scheduling with per-node traffic shaping (RC-EDF) has the largest schedulable region among all practical policies known today and has been considered a good solution for providing end-to-end packet delay bounds. In order to harness the traffic burstiness inside a network to satisfy the schedulability condition of EDF, pernode traffic shaping has been believed to be neces...

Packet networks are currently enabling the integration of traffic with a wide range of characteristics that extend from video traffic with stringent QoS requirements to the best-effort traffic requiring no guarantees. QoS guarantees can be provided in conventional packet networks by the use of proper packet scheduling algorithms. As a computer revolution, many scheduling algorithms have been pr...