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Connection Admission Control (CAC) is one of the resource allocation functions which plays a significant role to ensure Quality of Service (QoS) provisioning in wireless networks. To meet connection requirements, and achieve bandwidth efficiency with less computation complexity, we present a CAC mechanism for OFDMA-based WiMAX networks which uses fuzzy sets and fuzzy logic theory to admit new incoming...
In Ad Hoc technology, a mobile node is characterized by a limited battery power. Therefore, the energy consumption becomes an important challenge that must be taken into account when designing a new Ad Hoc routing protocol. An efficient routing protocol should also consider a high level of Quality of Service (QoS) such as the end-to-end delay and the bandwidth as the applications do not have the same...
The complexity of network routing infrastructures is increased dramatically. To tackle this issue, a promising state-of-the-art paradigm called software defined networking (SDN) is introduced. Due to the differences in the network requirements of applications, QoS-aware routing plays an important role in the networks. Recent proposed resource allocation algorithms focus on the current traffic matrix...
In this paper we analyze jitter behavior for Interrupted Poisson process (IPP) as incoming traffic. We propose model for jitter on one node, as well as for end-to-end jitter with IPP traffic on network nodes. Our model describes jitter behavior with respect to phase probabilities, traffic load, and tagged traffic share in aggregate traffic flow. We conclude that jitter for IPP is heavily dependent...
Online game's traffic becomes one of the important traffic over the Internet. In last decade, popularity of the Massively Multiplayer Online Game (MMOG) rapidly increased. Most of MMOG are constructed based on client-server architecture. MMOG needs a network with very low-latency point-to-point in upstream direction and low-latency broadcasted from server to client in downstream direction. In the...
Due to the unpredictable nature of channel availability, supporting the quality of service (QoS) of stringent delay sensitive traffic in cognitive radio networks (CRNs) is very challenging. Stringent delay sensitive calls in CRNs are susceptible to forced termination due to the preemptive resource occupancy priority of primary users. To enable more efficient usage of the spectrum while improving the...
We report the first measurements of the Quality of Service of Short Message Service provided by the three carriers in the Philippines where prepaid 2G systems are running at 90% capacity most of the time. We measured message completion rate, delay times, and billing accuracy for both ordinary and high density traffic cases. From these, we developed a figure of merit for the QoS as a product of the...
We propose two scheduling and resource allocation schemes that deal with Quality of Service (QoS) requirements in Uplink Long Term Evolution (LTE) systems. QoS for a multiclass system has been seldom taken into account in previous resource allocation algorithms for LTE uplink. In one of the new algorithms, we investigate the possibility of assigning more than one resource block and its consequences...
In many real-time applications the Quality of Service (QoS) is dominated by jitter. Currently jitter generators are based on Laplace distribution. Nevertheless, the observed jitter measurements depart from that distribution. As a matter of fact data resembles those of a t-Student distribution, and it is also known that Internet traffic presents heavy tailed behavior that can be modeled with alpha-stable...
According to different priority based services, IEEE 802.16e WiMAX standard classifies packets as UGS, RTPS, eRTPS, nRTPS, BE. The standard treats all packets generated while browsing the internet as delay tolerant packets and classifies them as Best Effort (BE) packets. This includes BE packets generated while browsing secure websites. However, secure transactions are governed by time constraints...
TCP, the facto standard used in today's Internet, has been found to perform poorly in Mobile Ad Hoc Networks (MANETs). This is exacerbated by contention with increasing UDP-based high priority multimedia traffic and the class differentiation introduced in current QoS protocols, which results into TCP starvation and increased spurious timeouts. In this paper, we propose a cross-layer TCP enhancement...
This paper presents a comprehensive system modeling and analysis approach for both predicting and controlling queuing delay at an expected value under multi-class traffic in a single buffer. This approach could effectively enhance QoS delivery for delay sensitive applications. Six major contributions are given in the paper: (1) a discrete-time analytical model is developed for capturing multi-class...
With the emerging IEEE 802.11n standard, the WLAN is poised as a promising ubiquitous networking technology to support multimedia applications where providing QoS becomes imperative. However, the 802.11 WLAN is not designed to support delay sensitive traffic. This problem is magnified during a handover and typically results in excessive handover latency and packet loss. In addition, a 802.11 WLAN...
The presence of delay-sensitive traffic in QoS-aware MANETs (mobile ad-hoc networks) results into increased TCP spurious timeouts, thus wasting their scarce bandwidth. Furthermore, the different dynamics used by a routing protocol in discovering and maintaining routes have a significant impact on TCP and MANETs in general. In this paper, we investigate the combined effect of contention- induced spurious...
Optical burst switching (OBS) that combines the advantages of OCS and OPS is an emerging technology to exploit the potential benefits of optical communication, that allow variable burst sizes and has gained much attention from both academic and industry. Low delay and also to reduce burst overlap in the electronic domain of an ingress node and hence to reduce burst loss improves quality of service...
A mobile ad-hoc network (MANET) is a wireless network in which nodes, in the absence of fixed access points, communicate via single or multi-hop paths. Each node in a MANET should thus be able to perform necessary routing functions, and a MANET routing protocol should be able to adapt fast and effectively to sudden changes in network layout. Providing trustworthy quality of service guarantees in a...
A distinguishing feature of the universal mobile telecommunications system (UMTS) is the support of different levels of quality of service (QoS) as required by subscribers and their applications. To provide QoS, the UMTS backbone network needs an efficient QoS mechanism to provide the demanded level of services on UMTS network. A model to investigate end-to-end quality of service (QoS) provisioning...
In this paper we present delay jitter protected-oriented scheduling mechanism for multi-traffic with QoS guaranteed on multi-carrier wireless system. The wireless physical channel quality and the time-delay features requirements of traffics are considered conjointly. When the power is allocated to all sub-carrier according to the water-filling algorithm for maximizing the capacity of the multi-carrier...
Telerobotic control systems can tolerate a fixed delay in the control loop, but are highly sensitive to delay jitter. Before such systems can be widely deployed over the Internet, packet switching techniques which ensure a high 'Quality of Service' (QoS) and low delay jitter will be required. It is shown that guaranteed-rate traffic flows can be delivered over the Internet backbone with very low delay...
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