This paper describes a new approach to pitch marking. Unlike other approaches that use the same combination of features for the whole signal, we take into account the signal properties and apply different features acc...
详细信息
Bandwidth variable-wavelength cross connect switches (BV-WXCs) play an important role in the routing and spectrum assignment (RSA) problem in elastic optical networks (EONs). These switches, whose structure has been d...
详细信息
In this paper, we consider a novel two-dimensional(2D) geometry-based stochastic model(GBSM) for multiple-input multiple-output(MIMO) vehicle-to-vehicle(V2V) wideband fading channels. The proposed model employs the co...
详细信息
In this paper, we consider a novel two-dimensional(2D) geometry-based stochastic model(GBSM) for multiple-input multiple-output(MIMO) vehicle-to-vehicle(V2V) wideband fading channels. The proposed model employs the combination of a two-ring model and a multiple confocal ellipses model, where the signal is sum of the line-of-sight(Lo S) component, single-bounced(SB) rays, and double-bounced(DB) rays. Based on the reference model, we derive some expressions of channel statistical properties, including space-time correlation function(STCF), Doppler spectral power density(DPSD), envelope level crossing rate(LCR) and average fade duration(AFD). In addition, corresponding deterministic and stochastic simulation models are developed based on the reference model. Moreover, we compare the statistical properties of the reference model and the two simulation models in different scenarios and investigate the impact of different vehicular traffic densities(VTDs) on the channel statistical properties of the proposed model. Finally, the great agreement between simulation models and the reference model demonstrates not only the utility of simulation models, but also the correctness of theoretical derivations and simulations.
In this work we investigate a promising scheduling algorithm referred to as the Deadline Credit (DC) algorithm, which exploits the available bandwidth and buffer space in communication networks to serve a diverse clas...
详细信息
In many practical scenarios, nodes gathering at points of interest yield sizable connected components (clusters), which sometimes comprise the majority of nodes. While recent analysis of mobile networks focused on the...
详细信息
ISBN:
(纸本)9781450301831
In many practical scenarios, nodes gathering at points of interest yield sizable connected components (clusters), which sometimes comprise the majority of nodes. While recent analysis of mobile networks focused on the process governing node encounters ("contacts"), this model is not particularly suitable for gathering behavior. In this paper, we propose a model of stochastic coalescence (merge) and fragmentation (split) of clusters. We implement this process as a Markov chain and derive analytically the exact stationary distribution of cluster size. Further, we prove that, as the number of nodes grows, the clustering behavior converges to a mean field, which is obtained as a closed-form expression. This expression translates the empirical merge and split rate of a scenario, a microscopic property, to an important macroscopic property-the cluster size distribution-with surprising accuracy. We validate all results with synthetic as well as real-world mobility traces from conference visitors and taxicabs with several thousand nodes. Copyright 2010 ACM.
Scheduling through wireless shared channels is a very challenging problem because of each user's link-state variations through time. The challenge lies in the support of the quality of service (QoS) of each user u...
详细信息
ISBN:
(纸本)9783800729616
Scheduling through wireless shared channels is a very challenging problem because of each user's link-state variations through time. The challenge lies in the support of the quality of service (QoS) of each user under the uncertainty of channel behavior. This problem becomes even more difficult for some of the 2.5G and 3.5G network architectures (e.g EDGE,HSDPA, HDR) where the supported transmission rate can take multiple values and the channel can not be modeled by the traditional ON-OFF model. In this paper we propose Expo-pred-wei, a new scheduling algorithm, which take advantage of the channel variations in order to maximize the total cell throughput and at the same time to preserve, in an efficient way, a minimum QoS for each user. In contrast to other proposed algorithms, our algorithm exhibits very good performance in a wide set of traffic scenarios including Real-Time (RT) or Non-Real-Time (NRT) traffic as well as mixed RT and NRT traffic.
This paper presents a novel approach to detecting and resolving service interactions in run-time of the Parlay-Based converged network (PCN) with service intentions. In this paper, we focus on feature interactions in ...
详细信息
This paper presents a novel approach to detecting and resolving service interactions in run-time of the Parlay-Based converged network (PCN) with service intentions. In this paper, we focus on feature interactions in the service layer and propose a novel approach of detecting and resolving feature interactions in run-time based on behavior context of services with the Parlay APIs in the Parlay-based Next generation intelligent network (NGIN). Some theory analysis of the approach is given. With the experiment prototype of the architecture of Parlay-based NGIN as well as the two entities of the Telestar application server entity (TASE) and the Telestar parlay gateway entity (TPGE), we extend the TASE of platform with the Service interaction manager (SIM) to manage the service interactions. At last, some experiment results are given.
We present two local approaches that yield polynomial-time approximation schemes (PTAS) for the Maximum Independent Set and Minimum Dominating Set problem in unit disk graphs. The algorithms run locally in each node a...
详细信息
ISBN:
(纸本)9781595930927
We present two local approaches that yield polynomial-time approximation schemes (PTAS) for the Maximum Independent Set and Minimum Dominating Set problem in unit disk graphs. The algorithms run locally in each node and compute a (1 + Ε)-approximation to the problems at hand for any given Ε > 0. The time complexity of both algorithms is O(TMIS + log*n/ΕO(1)), where TMIS is the time required to compute a maximal independent set in the graph, and n denotes the number of nodes. We then extend these results to a more general class of graphs in which the maximum number of pair-wise independent nodes in every r-neighborhood is at most polynomial in r. Such graphs of polynomially bounded growth are introduced as a more realistic model for wireless networks and they generalize existing models, such as unit disk graphs or coverage area graphs. Copyright 2005 ACM.
Ring Ingress Aggregated with Spatial Reuse (RIAS) has been proposed as a fairness model for Resilient Packet Rings (RPR) where available bandwidth is allocated among traffic flows in max-min sense. In this paper, we s...
详细信息
Resilient Packet Ring (RPR), which is being standardized as IEEE 802.17, is a new Medium Access Control (MAC) protocol for high-speed metro-area ring networks. RPR supports spatial reuse and therefore requires to ensu...
详细信息
暂无评论