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Weakly hard real-time application requires that scheduling algorithm should provide service satisfied QoS parameter, so a new fixed-priority scheduling algorithm with (m,k)-firm guarantee is presented. It assigns scheduling priority of task based on period and QoS parameter, and the task is switched between preemptive state and optional state to reflect its pressure. Schedulability test inequation...
IEEE 802.16e standard specifies a system for combined fixed and mobile broadband wireless access. The voice-over-Internet protocol (VoIP) is an important application in IEEE 802.16e system. The algorithm proposed allocates the extra-bandwidth according to the flow's priority, the lagging flow is compensated according to the service it has lost, and the leading flow relinquish bandwidth proportional...
Previously the cost and extremely limited capabilities of sensors prohibited quality of service (QoS) implementations in wireless sensor networks. With advances in technology, sensors are becoming significantly less expensive and the increases in computational and storage capabilities are opening the door for new, sophisticated algorithms to be implemented. Newer sensor network applications require...
A scheduling mechanism of differentiated services based on priority is presented in this paper, which is used to resolve a problem of resource assigned fairly in circumstance of wireless multi-services. This scheduling mechanism contrasts with other multi-services scheduling algorithms in performance by simulation. The simulation results indicate that the scheduling mechanism can provide QoS guarantee...
Ethernet-like Physical Frame Time-slot Switching (EPFTS) over DWDM has been proposed in order to meet high-speed switching and guarantee Quality of Service (QoS) user data required. It differs from existing switching techniques over DWDM by its superior QoS mechanisms embedded in and its capability to simplify Internet into a Single physical-layer User-data transfer Platform Architecture (SUPA). This...
In the current queue scheduling algorithm, there is no the algorithm that completely meets the requirements of PHB in DiffServ networks. Therefore, how to improve the scheduling algorithm aiming at the requirements for different traffic Qos is a problem needing to be handled immediately. Firstly, the existing queue scheduling algorithms supporting DiffServ are researched and compared for performance...
The IEEE 802.16 standard, which includes specification for the medium access control (MAC) and physical (PHY) layers, was designed to handle the requirements of different contemporary applications with diverse QoS requirements. IEEE 802.16 standard is equipped with signaling and bandwidth allocation algorithms that can accommodate many connections with a variety of QoS requirements at one subscriber...
Real time scheduling algorithms provide a mean to schedule tasks on processor such that real time constraints are guaranteed. Fixed priority real time scheduling algorithms have low runtime complexity and their behaviour can be categorized a prior but they do not support dynamic systems very well. A transient overload in dynamic priority scheduling algorithms may cause a critical task to fail but...
We present improved SNR-based packet scheduling (I-SPS) algorithm as an extension of SPS algorithm. In I-SPS, the connection with better channel condition will be assigned higher weight in scheduling and the connection suffered burst error will be compensated by increasing its weight after its channel condition becomes good. Theoretical analysis and simulation results demonstrate that I-SPS algorithm...
Designing scheduling algorithm in multi-services WCDMA system must take channel condition into account, and differentiate the service to guarantee the demand of QoS, avoid the userpsilas starvation, meanwhile try to improve the throughput and the fairness of the scheduling in the system as much as possible. Therefore, on the basis of PFS, we proposed a service differentiated proportional fairness...
In this paper we evaluate the performance of dynamic Packet Scheduling (PS) of 3GPP UTRAN Long Term Evolution (LTE) Downlink. Packet scheduling is of utmost importance in 3G LTE, because all traffic types with different Quality of Service requirements are competing of the resources. We present a decoupled time and frequency domain packet scheduling framework for LTE downlink. Simulation results with...
In this paper we study the traditional resource allocation model in IEEE802.16e (mobile WiMax) and propose two algorithms for scheduling and mapping higher layer data into the basic resource allocation units (slots) of OFDMA frames in IEEE802.16e. Both scheduling and mapping approaches are based on the quality of service requirements of each service flow in terms of data rate and bit error rate (BER)...
In this paper, we introduce a pricing model that ensures efficient resource allocation that provides guaranteed quality of service while maximizing profit in multiservice networks. Specifically, a dynamic allocation policy is examined that relies on online measurements while each service class operates under a probabilistic bound delay constraint. We present a rigorous analysis of the properties of...
As Grid networks grows, the complexity of resource management in Grid networks dramatically increases. To manage the Grid resources efficiently, policy based resource management system is suitable. However, the policy which made at a moment could not be appropriate to other time because the condition of the grid resources with time space changes. Thus, in this paper, we propose asynchronous policy-based...
The next generation Internet will be highly diversified in both underlying networking technologies and supported networking applications. The diversified Internet architecture requires effective collaboration among heterogeneous network domains to support various application requirements. One of the challenges to achieve this objective lies in enabling network domain collaboration and network-application...
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