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This paper introduces an end-to-end QoS scheme for GPON access networks, which consists of an intra-ONU dynamic weighted fair queuing (DWFQ) scheduler and a multiservice dynamic bandwidth allocation algorithm(MDBA). Both DWFQ and MDBA are integrated in DWFQ-MDBA scheme to support proportional differentiated services (PDiff-Serv) while alleviating the problem of light-loaded penalty resulting from...
Increasing demands of ubiquitous services in wireless networks and evolution towards heterogeneous solutions has driven the necessity of developing efficient QoS aware vertical handoff (handoff between different networks) mechanisms. This paper proposes a QoS aware fuzzy rule based vertical handoff mechanism that makes a multi-criteria based decision, found to be effective for meeting the requirements...
In this paper, two bandwidth allocation schemes for the transmission of medical data in the IEEE 802.11n based WLAN are proposed. These two schemes are based on the same idea: offline medical data are transmitted on the subcarriers for online traffic when these subcarriers are available; otherwise, these data are stored in patient devices. This is a tradeoff between the traffic load in the WLAN and...
For mobile multi-hop wireless network, IEEE 802.16j/MR network can not only supply large area wireless deployment, but also provide high quality network service to mobile users. In this paper, we will be focusing on QoS supporting for mobile users in the IEEE 802.16-MR network. The probability of a mobile user who visits a RS is known beforehand. With the same visiting probability of each RS and the...
With the recent development in silicon photonics, researchers have developed optical network-on-chip (NoC) architectures that achieve both low latency and low power, which are beneficial for future large scale chip-multiprocessors (CMPs). However, none of the existing optical NoC architectures has quality-of-service (QoS) support, which is a desired feature of an efficient interconnection network...
Dynamic bandwidth allocation in response to the bandwidth requirements of new emerging applications is an essential demand for future optical networks. Hybrid switching architectures combining the benefits of different switching technologies in a single node are key elements to support wavelength and sub-wavelength granularities. This paper proposes a novel feedback-based hybrid OBS/OCS node architecture...
Traditional IP multicast technology establishes and maintains a tree for each multicast group, and this leads to a serious state scalability problem when large numbers of multicast groups exist in a network. As a novel scheme to address this scalability problem, aggregated multicast forces multiple groups which have identical or similar trees to use one deliver tree. Given the number of multicast...
The peer-to-peer (P2P) networks provides a data distribution model that is attractive for Video on Demand (VoD) as it allows to decrease the costs and increase the scalability of video distribution. The two significant challenges in P2P VoD streaming are scalability and video quality. Both require efficient utilization of the resources in P2P network. Inspired by this finding, the paper addresses...
Prioritization of flows in a home network based on traffic classification is still no guarantee that enough bandwidth will be available between a server and a client. Besides, such QoS technologies need to be supported by every device in the end-to-end path to be effective, which is relatively expensive for the owners of home networks. In any small-scale IP network (best-effort or QoS-enabled) it...
We consider, for the first time, the problem of flexible/open wavelength assignment and propose an optimal as well as heuristic solution. Simulation results validate our solution to within 15% of the theoretical spectral limit.
It has been shown that recently proposed lumped-element-based cloak is not inherently broadband. More numerical results depicting scattering cross-section as well as the field (voltage) distribution for pulse excitation will be presented in the final paper. Also, the manufacturing of a cloak is in the progress and the experimental results will be presented in near future.
This paper targets at service provisioning and bandwidth allocation in single-service overlay multicast network by modeling it as a first-price monopoly auction. We propose a game theoretic pricing mechanism for determining the distribution of a typical multimedia content from an origin server, via the unicast links. By leveraging the rich theory of strategic mechanism design of microeconomics, we...
Peer-assisted content distribution technologies have been attracting attention. By using not only server resources but also the resources of end hosts (i.e., peers), we can reduce the offered load on servers as well as utilization of the access bandwidth of the servers. However, offered traffi to the network may increase because the traffi exchanged between peers passes across the network. Specificall,...
Network coding has been proven with the capability to improve the network bandwidth efficiency for multicast communications. Streaming based IPTV services provided by network operators match the paradigm of using network coding. However, the major research works in the literature focus on the selection of network codes under given routing paths. Few research work jointly considers routing and network...
We demonstrate a scheme to scale the bandwidth by several times while enhancing spectral flatness of frequency combs generated by intensity and phase modulation of CW lasers using cascaded four-wave mixing in highly nonlinear fiber.
Streaming services have been gaining much popularity in the Internet. The widespread adoption of broadband residential access enables individual users to use new bandwidth demanding services. Peer-to-Peer (P2P) multicasting approach using an overlay network to provide communication between peers is a valuable proposal for streaming since it provides rapid deployment at relatively low cost. Most of...
In IEEE 802.16 networks, bandwidth allocation is centralized at the base station (BS). For the uplink traffic, data transmission is scheduled after the BS processes bandwidth requests (BW-REQs) sent by mobile stations (MSs). In this paper we focus on the multicast/broadcast polling method, where MSs send their BW-REQs during contention periods. Contention-based polling is deemed suitable for Best-Effort...
As compared to live peer-to-peer (P2P) streaming, modern P2P video-on-demand (VoD) systems have brought much larger volumes of videos and more interactive controls to the Internet users. Nevertheless, the larger number of available videos and the flexibility of allowing users to jump back and forth in a video, have led to much fewer numbers of concurrent peers watching at a similar pace, that reduces...
In this paper we propose an enhanced IPACT with limited service for multi-thread DBA in long-reach EPON. We evaluate our scheme by simulations in single-thread and double-thread cases and show that the DBA performance in terms of average delay and jitter can be significantly improved by the proposed algorithm.
The IEEE 802.16e network faces the challenge of bandwidth shortage due to the growing demand for high-bandwidth applications. One promising approach is to obtain bandwidth by using cognitive radio (CR) technology, which provides an effective way to achieve incremental bandwidth from unlicensed spectrum. However, the appearance of primary users (PUs) does harm to the performance of secondary users...
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