Fairness Guarantees and Achievable QoS in Differentiated Services

ETXOP: A resource allocation protocol for QoS-sensitive services provisioning in 802.11 networks

We propose a control method for high quality and highly effective video multicasting to satisfy various QoS requirements of clients. Our method employs an MPEG-2 hierarchical coding technique for that purpose. Further, flow aggregation is introduced to achieve application level QoS (Quality of Service) guarantees. Our method can guarantee the network level QoS only if underlying networks provide some guaranteed services as in ATM, Intserv and Diffserv. We investigate the effectiveness and applicability of our method on networks with various QoS guarantees.

In this paper, we propose an energy efficient user association scheme for uplink heterogeneous networks with machine-to-machine (M2M) and human-to-human (H2H) coexistence. A group based random access protocol is designed for massive number of machine-type-communications (MTC) user equipments' (UEs) transmissions. A user association problem for UEs' energy efficiency maximization is formulated considering the HTC UEs' quality of service (QoS) guarantees and load balance among multiple BSs, simultaneously. A distributed iterative algorithm is developed to solve the optimization problem. In addition, the convergence of the proposed algorithm is proved. Simulation results show that our proposed scheme outperforms other schemes in terms of energy efficiency and QoS guarantees.

OFDMA femtocells are generally accepted as a very promising solution for indoor coverage with high data rate. However, the lack of systematic schemes to effectively mitigate macro/femtocell hierarchical interference, fully utilize radio resources, provide quality-of-service (QoS) and fairness guarantee among users suffocate the performance realization of femtocells. In this paper, an Adapted Soft Frequency Reuse (ASFR) approach is raised to combat traditional inter-cell interference (ICI) <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sup> by inheriting the conventional soft frequency reuse (SFR) functionality and to mitigate inter-tier interference (ITI) of macro/femtocells by applying an orthogonal spectrum reuse between macro/femtocells. Moreover, a powerful inter-femtocell interference (IFI) coordination mechanism is provided to complete the interference solution for the three types of interference in the macro/femtocell hierarchical networks. While the interference handling propositions are targeted at optimized spectrum partition for base stations (macro/femtocells included), to further increase spectrum efficiency, a Maximum Weighted Sum Capacity (MWSC) based scheduling design is adopted, to optimize spectrum allocation for users, with restraints to QoS and fairness guarantees. In this way, spectrum efficiency is enhanced at both the BS and UE sides. Simulation results show that the proposed solutions provide fairly good performance in comparison with conventional co-channel macro/femtocell utilizing Proportional Fair (PF) scheduling method.

In order to support mutimedia data transfers, the underlying network should support quality of service (QoS) guarantees. The QoS guarantees by the network and the associated systems (hardware/software) is a complex task. In this talk, I’ll outline the various issues related to the QoS in the Internet environment. The notion of QoS routing will be described in detail. Various options for routing and their associated overheads will be presented. Implementation issues will also be discussed.

Hybrid energy supply (HES) wireless networks have recently emerged as a new paradigm to enable green networks, which are powered by both the electric grid and harvested renewable energy. In this paper, we will investigate two critical but conflicting design objectives of HES networks, i.e., the grid energy consumption and quality of service (QoS). Minimizing grid energy consumption by utilizing the harvested energy will make the network environmentally friendly, but the achievable QoS may be degraded due to the intermittent nature of energy harvesting. To investigate the tradeoff between these two aspects, we introduce the total service cost as the performance metric, which is the weighted sum of the grid energy cost and the QoS degradation cost. Base station assignment and power control is adopted as the main strategy to minimize the total service cost, while both cases with non-causal and causal side information are considered. With non-causal side information, a Greedy Assignment algorithm with low complexity and near-optimal performance is proposed. With causal side information, the design problem is formulated as a discrete Markov decision problem. Interesting solution structures are derived, which shall help to develop an efficient monotone backward induction algorithm. To further reduce complexity, a Look-Ahead policy and a Threshold-based Heuristic policy are also proposed. Simulation results shall validate the effectiveness of the proposed algorithms and demonstrate the unique grid energy consumption and QoS tradeoff in HES networks.

We introduce a variety of mechanisms to enable scalable, adaptive, and reliable quality of service (QoS) guarantees across heterogeneous networking environments. The resultant scalable resource reservation scheme (SRRS) is the first resource management scheme that provides efficient fault protection based on the virtual reservation mechanism and a penalty-based adaptable reservation mechanism, so that QoS can continue to be guaranteed in the presence of faults without wasting expensive network resources unnecessarily. Based on the proposed geographical reservation mechanism and virtual IP addressing, SRRS can enable QoS guarantees in ad hoc mobile wireless networks. Also, resource reservation and allocation in SRRS are adaptive to the networking environments so that wireless QoS-guarantee issues can be resolved in the presence of mobility, making SRRS suitable for wireless mobile networks. We evaluate the performance of SRRS based on simulation and analysis, and show that SRRS can achieve considerably lower blocking rates as compared to previous reservation protocols.

Third generation (3G) wireless networks have been designed to provide high speed data services on both forward and reverse links. In addition to increased data capacity they also support QoS (quality of service) guarantees for user applications. Users may run multiple applications (service instances) simultaneously and QoS guarantees must be assured for one or more of them. In order to maintain these QoS guarantees for each user's service instance, the radio resources assigned to the mobile must be adjusted in real time. However, the forward packet data channel in 3G systems are time-shared among all mobiles. Furthermore, the forward link channel conditions of the mobile changes over time. This implies that the forward link throughput available to the mobile is stochastic. In this paper, we address the linkage between the application demands (i.e., based on the QoS attribute guarantees) and the available channel capacity (i.e., resources assigned by the scheduler) and present a simple solution to the problem.

With the Development of mobile ad hoc network (MANET), Quality of Service (QoS) routing and power-aware routing become more and more important. In the past, QoS guarantee and power control issues were treated separately. In this paper, we propose a novel on-demand QoS routing protocol, PMQR (power-aware multi-path QoS routing) in TDMA-based MANETs. Our protocol combines QoS routing and power-aware routing, which can provide QoS guarantee and achieve energy conservation by taking into account both the transmission power and the remaining energy at the intermediate nodes between a source and a destination. PMQR also can establish multiple paths, even for a single call, when the route search cannot find a path that meets the QoS requirements. Simulation results show that PMQR has good network performance and balances the energy consumption of mobile hosts.

Quality of service (QoS) management is an important issue in today's high-speed distributed systems supporting multimedia applications. Most existing QoS management schemes usually just cope with technical issues of resource reservations and QoS guarantees, often completely neglecting revenue issues which are especially important for service providers in order to maximize their profit. The revenue to be expected does not only depend on the stream itself but also very much on stochastic events such as network failures or QoS violations. A QoS management system taking revenue issues and the possibly stochastic behavior of the environment into account thus seems to be superior to the existing ones. We show how controller programs for such enhanced QoS management systems can be developed based on a new kind of Petri nets, so-called controlled stochastic Petri nets. We show how to numerically analyze such models using a tool environment in order to obtain strategies for the QoS management system.

Presents a synergy and integration of marketing and operations for continuous quality improvement in a service setting. Discusses measurements, improvements, and responsibilities of service quality. Integrates a service quality evaluation tool (SERVQUAL) and a service quality improvement tool (QFD). Claims that only through this synergy and integration of systems, concepts and tools will the aim of the organization in achieving service quality be reached.

To support Quality of service (QoS)‐sensitive applications like real‐time video streaming in IEEE 802.11 networks, a MAC layer extension for QoS, IEEE 802.11e, has been recently ratified as a standard. This MAC layer solution, however, addresses only the issue of prioritized access to the wireless medium and leaves such issues as QoS guarantee and admission control to the traffic control systems at the higher layers. This paper presents an IP‐layer traffic control system for IEEE 802.11 networks based on available bandwidth estimation. We build an analytical model for estimating the available bandwidth by extending an existing throughput computation model, and implement a traffic control system that provides QoS guarantees and admission control by utilizing the estimated available bandwidth information. We have conducted extensive performance evaluation of the proposed scheme via both simulations and measurements in the real test‐bed. The experiment results show that our estimation model and traffic control system work accurately and effectively in various network load conditions without IEEE 802.11e. The presence of IEEE 802.11e will allow even more efficient QoS provision, as the proposed scheme and the MAC layer QoS support will complement each other. Copyright © 2006 John Wiley &amp; Sons, Ltd.

In this work, the region of achievable quality-of-service (QoS) is precisely described for a system of real-time heterogeneous variable bit rate (VBR) sources competing for slots (packet transmission times) of a time division multiple access (TDMA) frame. The QoS for each application is defined in terms of a maximum tolerable packet-dropping probability. Packets may be dropped due to delay violations and channel induced errors. The region of achievable QoS is precisely described for an interference/resource limited network by considering the underlying TDMA-multiple access control (TDMA-MAC) structure and the physical channel. A simple QoS-sensitive error-control protocol that combats the effects of the wireless channel while satisfying the real-time requirements is proposed and its impact on the region of achievable QoS is evaluated. The results presented here clearly illustrate the negative impact of a poor channel and the positive impact of the employed error-control protocol on the achievable QoS. The region of achievable QoS vectors is central to the call admission problem, and in this work, it is used to identify a class of scheduling policies capable of delivering any achievable performance.

The study aimed to identify the effect of applying health care accreditation standards on its dimensions (patient rights, diagnostic services, medication management and safety, infection control, and leadership) on achieving the quality of health service at Jordanian university hospitals. To achieve the objectives of the study, a questionnaire was prepared and distributed to the study sample which included directors, their assistants, department heads, and administrative supervisors at Jordanian university hospitals, who numbered (157) members. The study used the descriptive analytical method, and the data was collected and analyzed, and hypotheses were tested using analysis of the Statistical Program for the Social Sciences (SPSS V.26). The study reached several results, most notably is the presence of an impact of patient rights, medication management and safety, as well as infection control, and leadership on achieving service quality at Jordanian university hospitals. One of the most prominent recommendations of the study is to emphasize the importance of applying accreditation standards, to emphasize the importance of continuous improvement and keeping pace with scientific development so that safety is achieved, medical errors are reduced, and the speed of completion becomes a basic goal that is reflected on the quality of health services.

Different distributed component-based applications (e.g., distributed multimedia, library information retrieval, secure stock trading applications), running in heterogeneous execution environments, need different quality of service (QoS). The semantics of QoS requirements and their provisions are application-specific, and they vary among different application domains. Furthermore, QoS provisions vary per applications in heterogeneous execution environments due to the varying distributed resource availability. Making these applications QoS-aware during the development phase, and ensuring their QoS guarantees during the execution phase is complex and hard