The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Multi-hop data dissemination in vehicular ad hoc networks (VANETs) has been very challenging due to the vehicle movement, various vehicle densities and the lossy characteristics of a wireless channel. The problem of how to provide an efficient broadcasting of time-critical broadcast messages under multi-channel operation of IEEE WAVE standard has not been discussed sufficiently. In this paper, we...
This paper investigates the secure information transfer issue for cognitive radio networks by exploiting the spectrum leasing technique. The design objective is to improve the secrecy rate of the primary user, and meanwhile, create the transmission opportunities for the secondary users. To achieve this goal, we consider a system model where the primary user harnesses the assist of the secondary users...
This paper investigates the joint optimization problem of user scheduling, user association, and resource partition in heterogeneous cellular networks (HetNet) with a general concave utility function used as the performance metric. We formulate the joint optimization problem, and decouple the problem into three sub problems. After proving the sub problems belong to the set of problems that maximizes...
In wireless sensor networks (WSNs), many applications require a high degree of reliability with low delay. Due to the lossy nature of wireless channels, achieving reliable communication can be very challenging. The most commonly adopted approach for achieving reliability is the acknowledgment based retransmission mechanism; however, this approach is inefficient in terms of end-to-end delay especially...
Many researchers have recently proposed using LTE to support traffic safety and transportation efficiency applications in vehicular ad hoc networks (VANETs). The deviceto- device (D2D) communication technique underlay LTE network has been considered as an effective way to potentially conduct vehicle-to- vehicle (V2V) communications. Since the vehicular communication environment has different characteristics...
This paper presents an optimal cooperative routing protocol (OCRP) for Content Centric Networking (CCN) aiming to improve the in-network cache utilization. The objective of OCRP is to selectively aggregate the multiple flows of interest messages onto the same path. This improves the cache utilization while mitigating the cache contention in the Content Store (CS) of CCN routers on the routing path...
The Content-Centric Networking (CCN) architecture exploits a universal caching strategy whose inefficiency has been confirmed by research communities. Various caching schemes have been proposed to overcome some drawbacks of the universal caching strategy but they come with additional complexity and overheads. Besides those sophisticated caching schemes, there is a probabilistic caching scheme that...
Video is playing a more and more important role in future Vehicular Ad-hoc Network (VANET) communication. It is a feasible medium for information sharing and entertainment (infotainment) with its high capacity, consistency and influence on human beings. This paper introduces the SVC coding scheme to VANET video streaming. We propose an Optimal Scheduling Algorithm (OSA) for video streaming in highway...
Multi-hop data dissemination in vehicular ad hoc networks (VANETs) is very important for the realization of collision avoidance systems and other many interesting applications. However, designing an efficient data dissemination protocol in VANETs has been a challenging issue due to vehicle movements, limited wireless resources and lossy characteristics of wireless communication. In this paper, we...
This paper deals with the retransmission protocol design for cognitive radio networks by exploiting the primary hybrid ARQ. In contrast with previous work that focuses on cancellation based retransmissions, we propose a novel cooperative coding based retransmission protocol for cognitive radio networks. The design objective is to improve the throughput of the primary user and create the transmission...
In vehicular ad hoc networks (VANETs), multi-hop broadcast protocols are required for many applications including driver assistance systems. However, providing a low end-to-end latency has been very challenging. In this paper, we propose a protocol which can provide a fast channel access for broadcast traffic flows in VANETs. The protocol introduces new control messages to reserve time slots for the...
This paper introduces a cross-layer implementation, named WiPoMu, that aims to improve efficiency and resilience of the traditional WiFi model. WiPoMu is developed based on three key technologies: Wireless virtualization, Policy routing, and Multipath TCP (MPTCP). Specifically, WiPoMu adopts the wireless virtualization to create multiple virtual WiFi interfaces on a single physical one, hence WiPoMu...
WiFi-Direct, a Wi-Fi standard, enables devices to connect easily with each other without requiring a wireless access point and communicate at typical WiFi speeds for file transfer, Internet connectivity, etc. It is widely used in many applications such as the traffic local sharing. The loss model of WiFi-direct link can facilitate the theoretical analysis when designing or optimizing the systems hence...
In wireless sensor networks (WSNs), the multi-hop MAC protocol combines duty cycling radio and forwarding packet via multiple hops (i.e., multi-hop forwarding) to achieve a good balance between energy and latency efficiency. The multi-hop MAC protocol has been proven to outperform other traditional duty cycling protocols, which allow forwarding a packet at most one hop in an operational cycle. Among...
Given texture and depth maps of one or more reference view-point(s), depth-image-based rendering (DIBR) can synthesize a novel viewpoint image by mapping texture pixels from reference to virtual view using geometric information provided by corresponding depth pixels. If the virtual view camera is located closer to the 3D scene than the reference view camera, objects close to the camera will increase...
This paper presents the outage probability and outage capacity analysis of cooperative orthogonal frequency division multiplexing (OFDM) system with subcarrier mapping (SCM) in Rayleigh fading. The capacity-maximization SCM scheme is analyzed and closed-form expressions are derived for the outage probability and outage capacity of the system by considering fixed gain amplify-and-forward relay node...
This paper presents the analysis of BER and ergodic capacity for dual-hop orthogonal frequency division multiplexing (OFDM) Amplify-and-forward (AF) relay system with subcarrier mapping (SCM) in Nakagami-m fading channel for m ≤ 1. The performance of capacity-enhancement optimal pairing scheme, i.e., Best-to-Best (BTB) SCM scheme is analyzed for the two special cases of Nakagami-m fading, i.e., one...
We address the route optimization problem for a nested mobile IPv6 NEtwork MObility (NEMO) environment. We propose an adaptive scheme which can optimize the routing process of the data communication, and minimize the end-to-end delay. The adaptive scheme consists of two sub-schemes: mobility-transparency sub-scheme and time-saving sub-scheme. The mobility-transparency sub-scheme performs well for...
In vehicular ad hoc networks (VANETs), multi-hop broadcast communications are required for many applications including driver assistance systems. However, providing a low end-to-end latency has been very challenging. In this paper, we propose a joint MAC network layer multi-hop broadcast protocol. For the network layer, the proposed protocol reduces the number of sender nodes by using common forwarder...
Many routing protocols in vehicular ad hoc networks (VANETs) utilize location information to find a route to the destination. However, tracking the location information of other nodes is very challenging in highly dynamic VANETs. We propose a location service which can provide location information with low overhead and low delay. The location service periodically disseminates the location of each...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.