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We describe here a burst scheduling algorithm to reduce burst overlapping with fiber delay lines (FDLs) in optical burst switching (OBS) network, and hence to improve the quality of service (QoS). We consider TAG (tell-and-go) protocol where many lightpaths pass in a given link and burst overlap may occur. In an intermediate node having two incoming links and one outgoing link at lower traffic loads,...
This paper investigates the performance of exponential/proportional fair (EXP/PF) and maximum-largest weighted delay first (M-LWDF) scheduling algorithms in the third generation partnership project long term evolution (3GPP LTE) providing packet-switched multimedia services. It, then, identifies a suitable packet scheduling algorithm on a basis of their performance evaluation. The performance evaluation...
IEEE 802.16 WiMAX is one of the popular technologies in the field of wireless networking recently, where channel resource allocation and reservation have become key issues. In the paper a QoS Coordinated Distributed Scheduling scheme (QC-DSCH) based on priorities is proposed to meet the QoS requirements in MAC layer. There are three algorithms in QC-DCSH. Adjusting hold-off time (AH) algorithm exploits...
In this paper an upgraded protocol referred to as Rate Adaptive Sustainable Physical Activity in Neighborhoods (RA-SPAN) protocol is proposed. In this protocol the power saving algorithm of SPAN is integrated with dynamic switching of data rates. Power consumption of nodes is reduced by cross-layer signaling between MAC and Network layers as in the SPAN protocol and dynamically electing the coordinators...
Jiter is referred as the variability of latency in packets over a period of time. In mobile network, topology changes rapidly which causes a reconfiguration of network. Therefore the latency of transmission also varies. It gives rise to a QOS problem as predicting exact latency is difficult. Hence time bound or real time packets can not be guaranteed highest QOS in MANET. It this paper we propose...
Packet scheduling has been a very popular paradigm to ensure maximum throughput and bounded delay access for packet flows. This work proposes packet scheduling approach to QOS provisioning in multihop wireless networks. Our scheduling mechanism achieves fair and maximum allocation of the shared wireless channel bandwidth for MANET's that consist of General nodes and Backbone nodes. Backbone nodes...
Quality of service support is a major challenge in VoIP. So much research has been devoted recently on maintaining an acceptable quality-of-service (QoS) for the transmission of real-time multimedia streams. In personal communication human speech processing is one of the most important procedure. Because if a low bit-rate codec is used in voice over IP (VoIP) to achieve a high compression ratio, the...
Multiple-input multiple-output (MIMO) technology using orthogonal frequency division multiplexing (OFDM) together called MIMO-OFDM has emerged as the viable alterative to meet the demands of greater bandwidth and quality of service of the ever expanding mobile communication networks. For MIMO-OFDM systems channel estimation is one of the challenging issues. Statistical characteristics of wireless...
The issue of the guarantee quality of service (QOS) for users can be provided by the advanced reservation. The advanced reservation is a kind of mechanism that can provide the ability to allocate resources for users based on the agreement upon the needs of quality service and increase of the number of accepted users' requests in grid system. Scheduling and advanced reservation of the resources in...
This paper mainly focuses on the throughput enhancement of legacy IEEE 802.11 MAC protocol. The two parameters, throughput and QoS are now main challenge for multimedia applications in wireless networks. Throughput parameter are very poor as compare with PHY data rate, even data rate goes infinite high. After certain PHY data rate, throughput are almost independent of data rate when data packets are...
RFID middleware plays an important role in enterprise applications such as integrating heterogeneous devices, processing data and events, providing uniform application interface and so on. However, some problems RFID middleware developers have to face are how to specify the quality of service for high level applications, how to transmit the RFID data efficiently, and how to consist the abilities of...
In mobile ad hoc networks, the unstable transport layer and inhibited amount of traffic being carried out by the network is owing to the high packet loss rates and frequent topological changes. It is essential that least available bandwidth and end-to-end latency along with congestion around a link are integrated in a QoS-based routing metric for MANETs. In this paper we develop a QoS-based, robust...
The biggest contemporary drawback in the maintenance and distribution of the global state is the increase in communication overheads. Therefore, localized routing is the method to avoid this problem. The network in this technique is inferred by the source nodes using statistics which are collected locally. The main aim of this paper is to present new localized algorithms to avoid some problems associated...
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