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In this paper, the fuzzy logic-based decision algorithm is proposed for queue scheduling. This algorithm is employed to determine the optimal values for achieving fairness control for each queue-type serviced. It takes into account the dynamic nature of the internet traffic as regards to its time-varying packet arrival process that affects the network states and performance. In order that the fairness...
Context-awareness is a key requirement in many of today's networks, services and applications. Context Management systems are in this respect used to provide access to distributed, dynamic context information. The reliability of remotely accessed dynamic context information is challenged by network delay, packet drop probability, information dynamics and the access strategies taken. QoS classification...
In the next generation of wireless networks, mobile users can move among heterogeneous networks, using terminals with multiple access interfaces and non-real-time or real-time services. The most important problem in such environment is the Always Best Connected (ABC) concept permitting the best connectivity to applications anywhere at anytime. In this paper, we compare the performance analysis network...
A new quality of service (QoS) enhancement scheme for IEEE 802.11e Enhanced Distributed Channel Access (EDCA) protocol is developed. It uses a combination of an adaptive access category (AC) traffic allocation, incorporated into the network's wireless side, and weighted round robin (WRR) queuing scheduling mechanism, incorporated into the wired side of the network. The adaptive traffic allocation...
In communication networks data packets are often transmitted via multiple hops on certain destined source-destination paths. The topological structure of such a scenario can be modeled by multi-node tandem queueing networks, but the standard independence assumption of queueing theory does not hold, that is, modeling the packet processing times at the successive nodes as independent and identically...
The paper introduces Smart Grids and the methodology for the selection of ICT technologies for them. It describes the quality and implementation-operating parameters for evaluation ICT technologies and services and applications running in Smart Grids. The methodology is based on a comparison of these parameters. This methology is also based on the availability and reliability of ICT technologies....
Long Term Evolution-Advanced (LTE-A) is a new radio access technology that is expected to provide better experience among the mobile cellular users. It delivers multimedia services using packet switching technology. Therefore, intelligent design of packet scheduling for the LTE-A to provide Quality of Service (QoS) comparable to fixed line services becomes crucial. However, packet scheduling over...
The Ethernet passive optical network is being regarded as the most promising for next-generation optical access solutions in the access networks. In time division multiplexing passive optical network technology (TDM-PON), the dynamic bandwidth allocation (DBA) plays a crucial key role to achieve efficient bandwidth allocation and fairness among subscribers. Therefore, the traffic prediction in DBA...
This paper reports on the quality of service (QoS) mapping mechanisms for converged OFDMA-PON and LTE networks to satisfy the stringent QoS requirements. Various options for exhibiting QoS mapping between the LTE bearers and optical OFDMA-PON queues have been presented. These include, wireless classes forwarded directly to one priority optical queue (so called non-mapping mechanism), 1:1 mapping where...
As military, academic, and commercial computing systems evolve from autonomous entities that deliver computing products into network centric enterprise systems that deliver computing as a service, opportunities emerge to consolidate computing resources, software and information through cloud computing. Along with these opportunities come challenges, especially to service providers and operations centers...
Transmission of video and imaging data requires both energy and QoS aware routing in order to ensure efficient usage of the sensors and effective access to the gathered information. In large-scale networks with a large number of sensor nodes, multiple sink nodes should be deployed to increase the manageability of the network and also to reduce the energy dissipation at each node. In this paper we...
The delay sensitive industrial control applications like Industrial process control, Environmental control, Gas leakage monitoring, etc. in this a reliable communication between sensor and base station are highly essential. Wireless Sensor Networks (WSN) becomes an immensely popular technology in such application as it offers low latency and high energy-efficiency in message transmission. Life span...
Electronic learning has produced a comfortable, sophisticated, interactive and adaptable teaching model. Moreover, the consistent technical progress in this field allows the development of increasingly interesting applications [1]. We chose to select those elements to create an e-learning environment. This paper presents a model of the multi-tiered e-learning system based on Web Services. It shows...
Five types of service flows are defined in the standard of IEEE 802.16. Each service flow has its own type of quality of service (QoS) requirement. Some scheduling algorithm is needed to satisfy the QoS requirement of each class. Traditional base station (BS) allocates bandwidth according to the request of user. However, the request may not equal to the real requirement in some situation. Thus, the...
With the rapid proliferation of network enabled hand devices Mobile Ad hoc network (MANET) is gaining tremendous popularity among the research community. Wirelessly connected mobile nodes are capable of providing a wide range of services such as GPS position indicator, nearest car parking information, word processing, internet connectivity etc. to other nodes in their vicinity. Service composition...
Delay tolerant networks (DTNs), which are wireless networks prone to long delays and frequent disruptions are increasingly becoming common. We are exploring the challenges involved in designing effective event notification framework on DTNs. This paper presents the design and evaluation of a delay-tolerant event notification framework called DATEM based on the philosophy that failures and delays are...
Traditionally, a packet with errors, either due to channel noise or collisions, is discarded and needs to be retransmitted, leading to performance losses. Hybrid Automatic Retransmission reQuest (H-ARQ) and time diversity multipacket reception approaches, such as Network Diversity Multiple Access(NDMA), improve the system performance by requesting additional retransmissions and combining all the signals...
The full coverage of continuous voice cloud services is still an open issue in an overlapping network, particularly with regard to heterogeneously public communication network infrastructures. However, hardly anyone of today's service providers offers seamless voice call continuity across these networks due to the high technical integration effort and economic cost. Given this backdrop, we present...
We propose the Most-Emergent-First (MEF) scheduler which regard the emergency score obtained from the delay status and traffic specification (TSPEC) to determine transmit sequence of flows. Via cross-layer signaling, transmission opportunities (TXOPs) of flows are dynamically adjusted to meet the TSPEC while the bandwidth utilization in a IEEE 802.11e environment is maintained. The proposed prioritized...
How to provide quality of service (QoS) guarantees in routing and switching systems has become one of the key research topics in the areas of routing and switching technologies. Differentiated services architecture (DiffServ) is known as a promising way for supporting QoS in a high-speed backbone network scenario. However, the measurement indexes for realtime multimedia traffic, which plays very important...
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