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This paper proposes a RSU assisted multi-channel coordination MAC (RAMC) protocol that fully utilizes all DSRC channels to provide simultaneous safety and non-safety communications. Within the radio range of a roadside unit (RSU), vehicles are free to tune to any service channels. The RSU monitors all the safety messages being transmitted in both the control and service channels. Periodically, the...
The IEEE 802.11p/1609 standards specify a suite of communication protocols for vehicular communication networks. A new operational mode, called the WAVE (Wireless Access in Vehicular Environments) mode, is defined to enable communication among high-speed vehicles or between a vehicle and a roadside infrastructure network. In the WAVE mode, a mobile/stationary station uses a combined FDMA/TDMA channel...
Directional antennas in ad hoc networks offer more benefits than the traditional antennas with omni-directional mode. With directional antennas, it can increase the spatial reuse of the wireless channel. A higher gain of directional antennas makes terminals a further transmission range and fewer hops to the destination. This paper presents the design, implementation and simulation results of a multi-channel...
In the IEEE 802.15.4 medium access control (MAC) protocol for wireless sensor networks, a sensor node needs to associate with a coordinator before it starts sending or receiving data. The sensor node will mostly choose the nearest coordinator to associate with. However, this method is not suitable for a constantly moving sensor node because it will end up switching coordinators too often due to short...
Extending system lifespan by managing power on mobile nodes is critical and primordial in wireless ad hoc networks. Recent work has shown that, by appropriately powering off nodes, energy may be significantly saved, especially when node density is high. Such approaches rely on the selection of a virtual backbone of the topology to forward ongoing traffic, coupled with functions to reorganize (manually...
In this paper, we present two loop free alternative path (LFAP) computation algorithms for the seamless soft handoff (SHO) architecture proposed in [5] and its performance for tactical wireless mobile ad hoc networks. The proposed handoff architecture consists of several key components such as LFAP computation module, link quality prediction module, and link monitoring module. The key idea of the...
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