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Stringent QoS maintenance in a wireless environment for VoIP communication is a major challenge. VoIP inherently generates constant bit rate traffic and is highly sensitive to network delay. However, unpredictable network congestion makes a VoIP session so degraded that its QoS goes below a tolerable limit. Accordingly, a suitable solution is needed to adapt varying network conditions satisfying minimum...
Most radio resource management algorithms engage radio resource management and Call Admission Control (CAC) separately as two different procedures. This incorporation of these two procedures into a single scheme seems challenging. In this paper a novel framework combining radio resource management and Probabilistic CAC (PCAC) is proposed. When an incoming call requests admission to the network, radio...
The following topics are dealt with: next generation Internet; wireless networks; QoS; admission control; overlays and virtualisation; multipath communications; context-aware networking; network resiliance and robustness; and network and traffic measurement.
In this paper, we investigate the effects of pricing incentives in order to control the number of users requested access in cellular system. The system has been modeled as continuous time Markov chains with Poisson traffic for both new and handover calls. With mathematical results, formulations have been derived to show the values of new call blocking probability, probability of new calls are given...
In next generation wireless networks, great challenges have been posed to provide mobile multimedia services with QoS guarantees. Since bandwidth is a scarce resource in wireless networks, effective management of the limited radio resources is important to enhance the network performance. In this paper, we propose an adaptive and dynamic resource reservation and call admission control (CAC) strategy...
In a heterogeneous wireless network, where many different wireless networks interwork together, call admission control is an important issue to distribute user traffic among different access networks in order to provide quality of service (QoS). In this paper, we present and analyze the performance of a call admission control (CAC) policy for voice and data calls, which is based on one-hop cooperation...
Resource reservation call admission control (CAC) schemes constitute an efficient solution for prioritizing high priority calls. Issues concerning fairness among calls arise during the implementation of CAC. In this paper, a new optimization model selecting the admission probability in thinning schemes is proposed to provide fairness in resource sharing among different input call stream flows. The...
In multiservice wireless networks, Call Admission Control (CAC) is essential to assure the quality of service requirements of the supported traffic. Call requests are usually classified into two different types: narrow-band and wide-band calls. In this paper, the probabilistic CAC scheme employed is extended through a game theoretic framework for resource allocation and price bargaining for the required...
Many next generation applications (such as video flows) are likely to have associated minimum data rate requirements to ensure satisfactory quality as perceived by end-users. While there have been prior approaches on supporting quality-of-service (QoS) in mesh networks, they have largely ignored the issues that arise due to self-interference, the interference between different link layer transmissions...
In this paper, we present a new effective mathematical analysis to numerically evaluate the performance for multi- traffic in wireless communication networks with multi-channel and an admission control scheme. We apply a matrix geometric solution method to describe the stochastic behavior of the system and give the exact performance measures, such as, utilization of channel for both voice and data...
In this paper, we investigate into optimal admission control policies for Heterogeneous Wireless Networks (HWN), considering an integration of wireless mesh networks with an overlaying cellular infrastructure. In order to characterize the overflow traffic from the underlaying mesh to the overlay, a Partially-Observable Markov-Modulated Poisson Process (PO-MMPP) traffic model is developed. This model...
Call admission control is an essential approach for traffic control and QoS provisioning. Compared with the single network, it is quite complicate for multi-service heterogeneous wireless networks. In this paper, a hierarchical joint call admission control HJCAC is proposed. The framework of the scheme, new introduced messages format and service access procedure is also designed in this paper. Simulation...
In this paper, we proposed a measurement-based admission control (MBAC) algorithm for adaptive real-time applications in wireless IP network. In our algorithm, admission test is performed over successive time scale based on the maximal link busy time (MBT), which provides an upper bound for admission test. Analysis and simulation results show that the proposed algorithm possesses consistency and robustness...
The transmission of data is from the mesh routers to gateway by multi-hop and then to Internet. The gateway where the traffic congregates becomes the bottleneck of the network. End-to-end delay with upper bound is one of guaranteed services, and whether the upper bound can obtain the guarantee is a key to present QoS guarantees, implement routing effectively, congestion control and load balance in...
This paper sketches and evaluates the impact of BiCyQLE, a framework for bidirectional cross-layer management of QoS capabilities in wireless multimedia environments. It is bidirectional in that it improves the utilization and provisioning of scarce wireless network resources toward the lower layers of the communication model. In direction of the higher layers, it performs adaptive source rate control...
Admission control is an essential part of a traffic management system. Overloading the network will only lead to congestion and performance degradations. The paper investigates how to design admission control in wireless TDMA-based multi-hop networks. Key components are the estimation of the available resources and how to coordinate the usage of these resources among the nodes. To increase robustness...
Call admission control (CAC) is a significant radio resource management (RRM) function for quality of service (QoS) provisioning in wireless networks. Different CAC schemes have been proposed and evaluated, most of them under the call blocking probability (CBP) achieved. On the other hand, CAC problem in multiclass wireless networks should not only be evaluated under the CBP achieved for every service...
Fine-level rate control, particularly meeting rate requirements and differentiating various types of end-to-end traffic, remains an open problem for multihop wireless networks. Traditionally, rate assurance in wired networks is achieved through resource reservation and admission control, which can be efficiently implemented since the bandwidth capacity of each communication link is known and the sender...
Admission control is a key management function in wireless networks, particularly wireless mesh networks (WMNs), in order to support multimedia applications that require quality of service (QoS) guarantees. Even using state of the art schemes to provide QoS, if the amount of traffic in the network is allowed to increase in an uncontrolled manner, network performance will deteriorate significantly...
Providing strong QoS guarantees for wireless multi-hop networks is very challenging, due to many factors such as use of a shared communication medium, variability in wireless link quality, and so on. However, wireless mesh technology gives the opportunity to alleviate some of these problems, due to lack of mobility in the wireless infrastructure, and presence of natural centralization points in the...
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