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Recent advances in autonomous vehicles and vehicular communications are envisioned to enable novel approaches to managing and controlling traffic intersections. In particular, with intersection controller units (ICUs), passing vehicles can be instructed to cross the intersection safely without traffic signals. Previous efforts on autonomous intersection control mainly focused on guaranteeing the safe...
This paper introduces a simulation software, named Simatrix, for designing millimetre-wave reflector antenna and transmission system based on Diffracted Gaussian Beam Analysis. DGBA is a fast and modularized method for quasi-optical system (QOS) analysis. The Simatrix offers the functionalities of modeling and simulating 3D asymmetrical QOS, designing systems which contain shaped-mirror reflectors...
Opportunistic spectrum sharing (OSS) has become an effective method to fully utilize the scarce spectrum resources. In this paper, we propose an OSS scheme with quality-of-service (QoS) support for secondary users (SUs) in cognitive radio networks (CRNs). SUs are classified into the SUs with real-time traffic (RT-SUs) and the SUs with non-real-time traffic (NRT-SUs). The RT-SUs have higher terminated-priority...
In this paper, we present an opportunistic spectrum sharing (OSS) scheme with quality-of-service (QoS) support for the secondary users (SUs) with non-real-time (NRT) traffic and real-time (RT) traffic in the presence of unreliable spectrum sensing in cognitive radio networks (CRNs). We also model the scheme using a 4-dimentional continuous-time Markov chain and derive spectrum sharing performance...
As an essential part of Multi-channel MAC protocol, the channel scheduling algorithm aims at enhancing the network throughput and resource utilization. Based on the WAVE standard in vehicular communications, this paper improves WAVE MAC by using the time division access on service channels and proposes a channel scheduling scheme to negotiate and allocate the channel resources for throughput-sensitive...
This paper presents a distributed adaptive QoS medium access control (DAQ-MAC) protocol for mobile ad hoc networks. The protocol assigns nodes accessing channel in three phases: the prioritization phase, the contention phase and the transmission phase. The prioritizations of data packets are expressed by a few binary signed digits. In the prioritization phase, when binary signed digit is “0”, nodes...
Based on the concept of random contention and collision resolution, a distributed QoS-guaranteed multiple access (QMA) protocol for mobile ad hoc networks is proposed to support multimedia service and multihop architecture. In the protocol, nodes with real-time traffic have higher priority to access channel than those with non-real-time traffic by broadcasting forecast bursts (FB) in earlier group...
The priority method is proposed for wireless LAN in this paper, which is that different workstations are distinguished with different business in wireless LAN, through modeling and simulation, the network performance parameters are analyzed in the priority mechanism, the results showed that the priority mechanism can achieve the better network performance. To a certain extent, it is guaranteed that...
Based on the concept of random contention and collision resolution, a QoS-based multiple access (QMA) protocol for ad hoc networks is proposed to support multimedia service and multi-hop architecture. The traffic is divided into two groups with different requirements on delay, namely real-time traffic and data (or best effort) traffic. According to the protocol, nodes contend to access channel, and...
A QoS-based multiple access (QMA) protocol for multi-hop ad hoc networks is proposed. In this paper, the traffic is divided into real-time and non real-time traffic. According to the protocol, nodes with real-time traffic have higher priority to access channel than those with non real-time traffic by broadcasting forecast bursts (FB) in earlier contention slots. Meanwhile, traffic is scheduled according...
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