Neighbourhood-aware counter-based broadcast scheme for wireless ad hoc networks

Broadcasting is a vital operation in mobile ad hoc networks (MANETs) and it is crucial to enhance its efficiency to ensure successful deployment. Although flooding is ideal for broadcast operations due to its simplicity and high reachability it suffers from high packet collision which can degrade network performance severely. Counter-based broadcast schemes have been introduced to alleviate the limitations of flooding. This study introduces an enhancement to counter-based broadcast by adjusting the threshold value and the Random Assessment Delay (RAD) using minimal neighbourhood information

The Cluster-based Power Management for promoting Time to Live in ad hoc networks

[[abstract]]In ad hoc networks, one inevitably serious problem is that the power of battery is not permanent which explains that portable devices perhaps shut down suddenly if the power of hardware is die out. Hence, how to decrease the power consumption is an important issue in ad hoc networks. With the development of wireless technology, mobile devices are not only permitted of transmitting voice, but also allowed to surf the Internet or download entertaining stuffs. Furthermore, it also can support some P2P applications such as sharing real-time streaming. In order to keep a stable quality, the transmission cannot break off unexpectedly which illustrates that it is necessary to select some managers to coordinate each node in a P2P community. Those managers can assign jobs to their staffs if needed. When employees retire, the managers can reappoint jobs in advance. In this paper, we proposed a mechanism called Cluster-based Power Management (CPM). The CPM could keep transmissions stable and increase Time to Live (TTL) of mobile hosts. In our new proposed method, we build the clusters according to the joined order and capability of each node, and adjust sleep time of each node dynamically though three differently mathematical models. By this way, the actual advantages of reducing the power consumption and increasing the total TTLs are presented in our simulation results

IEEE802.15.4无线传感器网络中的能耗研究

低速率、低功耗的无线传感器网络日益发展,传统网络协议并不适用。IEEE 802.15.4通信协议是短距离无线通信的IEEE标准,包含了MAC层和物理层的规范,规定了在个域网(PAn)中设备之间的无线通信协议和接口。该标准也可用于无线传感器网络,尤其是活动时段(CAP)中采用的CSMA/CA算法对节省网络中的能耗有很大作用,本文分析了其中bO、SO以及数据传输间隔对无线传感器网络中的设备及协调器功耗的影响

A Multiple Classifiers Broadcast Protocol for VANET

Many types of artificial intelligent machines have been used for decision making purposes. In VANET broadcast protocols, vehicles must decide the received messages are to be rebroadcast or not. Several attributes such as sender-to-receiver distance, sender-receiver speed difference, number of neighboring vehicles, as well as vehicle’s movement direction are important measures to take the broadcast decision. As the relationships of attributes to the broadcast decision cannot be mathematically defined, the use of a classifier-based artificial intelligence may approximately predict the relationships of all the incorporated attributes to such a decision. As the decision is based on prediction, the use of multiple classifiers in decision making may increase accuracy. Therefore, this research employs a combined-classifiers at an abstract level to provide firmer broadcast decisions on VANET. Our research results justify that the performance of our combined multiple-classifiers outperformed a single-classifier scheme. The multi-classifiers scheme contributes to an average increase of 2.5% in reachability compared to that of the efficient counter–based scheme (ECS). The combined multi-classifiers scheme also improves the saving in rebroadcast tries by 38.9%

V2X solutions for real-time video collection

© 2014 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.[EN] Quickly identifying the severity of highway acci-dents, as well as the resources required to assist the people involved in those accidents, is a basic requirement for future intelligent transportation systems. In this context, vehicular communication technologies currently being standardized are able to provide novel solutions to address this problem. In this work we study the feasibility of combining vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) communications to deliver a video stream from the place of the accident to the traffic authorities. Our approach relies on vehicles as data relays, thus having the additional advantage of providing drivers with a clear view about the accident, thereby helping to reduce stress and improving traffic flow. An experimental analysis comparing different traffic flooding mechanisms for wireless networks show that the proposed system is viable for highways with moderate/high amounts of traffic, although highlighting the need for more efficient mechanisms specifically addressing broadcast propagation in highway envi-ronments.This work was partially supported by the Ministerio de Economía y Competitividad, Spain, under Grant TIN2011- 27543-C03-01, by the Ministerio de Educación, Spain, under the FPU program, AP2009-2415, and by the National Institute of Informatics International Internship Program.Torres Cortes, A.; Ji, Y.; Tavares De Araujo Cesariny Calafate, CM.; Cano Escribá, JC.; Manzoni, P. (2014). V2X solutions for real-time video collection. En Wireless On-demand Network Systems and Services (WONS), 2014 11th Annual Conference on. IEEE. 116-121. doi:10.1109/WONS.2014.6814731S11612

Self-pruning broadcasting for mobile ad hoc networks

The IEEE Global Telecommunications Conference (GLOBECOM 2009), Honolulu, HI., 30 November-4 December 2009, p. 1-6Broadcasting is a process of delivering a message to all nodes in a network. While it is important to ensure that all nodes get a copy of the broadcast message, minimizing the number of sending nodes is equally important especially in resource-constrained wireless networks. Existing broadcasting protocols based on self-pruning are ineffective in achieving these objectives. Therefore this paper proposes two protocols based on simple timer mechanisms to prioritize broadcasting of messages such that node with most uncovered neighbors rebroadcast first. Additionally a timer suppression mechanism is proposed to further enhance the effectiveness of the broadcasting protocol. Compared with an existing protocol, extensive simulation experiments confirm that the proposed protocols achieve better performance.published_or_final_versio

An Adaptive Probabilistic Model for Broadcasting in Mobile Ad Hoc Networks

Ad hoc peer-to-peer mobile phone networks (phone MANETs) enable cheap village level telephony for cash-strapped, off-the-grid communities. Broadcasting is a fundamental operation in such manets and is used for route discovery. This paper proposed a new broadcast technique that is lightweight, efficient and incurs low latency. Using extensive simulations, we compare our proposed technique to existing lightweight protocols. The results show that our technique is successful in outperforming existing lightweight techniques on the criteria that are critical for a phone-MANET.