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Data dissemination in vehicular ad hoc networks (VANETs) has recently received considerable attention. Due to the unique characteristics of VANET, the implementation of reliable data dissemination among vehicles has encountered many challenges. In this paper, a reliable and efficient data dissemination scheme is presented. Relative locations between neighbor vehicles are predicted to improve delivery...
Geographically distributed data centers for the rapid growth of worldwide cloud service bring the demand of massive inter-data center information exchange. Considering the capacity and costs, existing optical networks show their advantages to carry the non-interactive, delay tolerated and bulk inter-data center data. In order not to affect the real-time traffic, these bulk data is usually transferred...
There are kinds of Internet applications such as VoIP, online gaming and video Conferencing which need quality of service guarantees making the performance analysis critical, and the traffic of such applications usually exhibits the properties of self-similarity and heavy tail. In this paper, we use the generalized Stochastically Bounded Burstiness model to characterize the network traffic with self-similar...
In this paper, we present an Multi-Dimensional Learning multiple access control scheme for cognitive radio users in unlicensed spectrum. The proposed scheme is developed by applying reinforcement learning to the perspectives of both channel assignment and retransmission policy based upon a multichannel p-persistent CSMA algorithm. In a distributed open spectrum sharing situation, decisions regarding...
A Module Matched First Dispatching (MMFD) algorithm for MSM Clos-network switches is proposed in this paper. Each output port of input modules and central modules has its own state pointer. At the beginning of each time slot, schedulers configure the state of each central module according to the value of each pointer. And then, cells switched in next time slot are selected on the basis of the configuration...
Cognitive networks embody a sense of dynamic responsiveness as actions are typically taken in response to changing circumstances and changing resource availability, which use prior and current knowledge gained from the network to take actions with respect to the end-to-end goals of the whole network. According to the cognitive network framework, a multi-path routing algorithm based on traffic prediction...
One of the most popular applications of IEEE 802.16 network is to serve as a backhaul service for IEEE 802.11 networks. However, the traffic of an IEEE 802.16 connection aggregated from IEEE 802.11 networks fluctuates. Thus, efficient bandwidth reservation at the subscriber station (SS) is an importance issue. This study proposes a simple and flexible bandwidth reservation scheme at the SS, called...
We study the optimal control of communication networks in the presence of heterogeneous traffic requirements. Specifically, we distinguish the flows into two crucial classes: inelastic for modeling high-priority, delay-sensitive, and fixed-throughput applications; and elastic for modeling low-priority, delay-tolerant, and throughput-greedy applications. We note that the coexistence of such diverse...
In this paper, we analyze the impact of configuration time on network performance in GMPLS based WDM networks, and propose a modified destination-initiated reservation (M-DIR) approach to reduce the impact.
There has been a dramatic increase in interactive cloud based software applications. Compared to classical real-time media applications (voice over IP (VoIP)/conferencing) and non real-time file delivery, these interactive software applications have unique characteristics: 1) they are delay sensitive yet demand in order and reliable data delivery, and 2) the traffic is usually bursty. Traditional...
Spectrum sensing algorithms are developed for cognitive radios to support real-time traffic. Multiple bands are sensed in parallel to reduce sensing delay, while meeting a minimum rate requirement with a prescribed outage probability. Interference constraints are also imposed to protect primary user (PU) transmissions. Both fixed sample size (FSS) and sequential sensing algorithms are developed. In...
In this paper, we study the delay performance of wireless network considering different resource allocation schemes with single-hop traffic. Existing works studying the delay performance only consider a given resource allocation scheme, either multi-channel system (sharing bandwidth) or time slotted system (sharing time). The fundamental question ignored is which type of resource allocation scheme...
Traffic aggregation in large-scale and multi-hopping wireless sensor networks (WSN) can generate a high load on some intermediate nodes that are close to the access point (sink) due to packet relaying, especially in complex in-door environment. This can result in over-burdened sensor nodes exhausting their batteries resulting in more frequent need replacement. This paper studies the characteristics...
This paper presents analytical models to dimension the transport bandwidths for the S1 interface in the Long Term Evolution (LTE) Network. In this paper, we consider two major traffic types: elastic traffic and real time traffic. For each type of traffic, individual dimensioning models are proposed. For validating these analytical dimensioning models, a developed LTE system simulation model is used...
We discuss the dynamic bandwidth allocation schemes in TDMA uplink channel of satellite networks. And a scheme based on max-min fairness is discussed and implemented in Tdma-bod simulator of ns-2. Simulation results show that this scheme can improve the throughput and delay performance and provide better QoS for satellite system. And in future network scenario that including more burst traffic and...
The next generation of wireless networks (e.g., Long Term Evolution (LTE)and WiMAX) use multiple techniques to improve channel spectral efficiencies. In this paper we focus on one such technique, namely Coordinated Beam Switching (CBS). With CBS, each sector determines a sequence of beams (possibly with repetitions) over which it continuously cycles. Each sector independently determines its beam pattern...
As a cognitive network is forward looking and gains from current and previous information on the network to achieve an intended goal, a routing algorithm, Minimum Workload Routing Algorithm (MWL) in cognitive networks, is proposed, which is depending on the prediction traffic model-MMSE to construct the prediction traffic matrix and select the route with the lightest traffic load which is no more...
All of the traditional switch can not distinguish the different traffic classes accurately, in order to provide a better QoS for various traffics existing already and potential unknown future traffic, we considers the problem from the all new angle and propose a novel CICQ scheduling mechanism for differentiated QoS based on identifier. The mechanism management the network data flow in denomination...
Wireless Mesh Network is mainly used to obtain Internet access, so most of the traffic converges to gateways. Due to the nature characteristic of WMN traffic model, gateways unavoidably become the bottleneck of the whole network. An anycast-based gateway selection model was proposed in this paper to solve the gateway selection problem. In this model, all the gateway nodes were abstracted as an anycast...
To minimize the power consumption of a mobile device, mobile WiMAX based on IEEE 802.16/802.16e defines three power saving classes for transmitting different types of data traffic. However, the standard specification does not suggest a power saving class for transmitting background TCP traffic, such as a long FTP session. This paper investigates the energy efficiency of TCP transmission over a WiMAX...
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