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Mac Protocols in Mobile Ad Hoc Networks  [cached]
Nermin Makhlouf,Pavel Vajsar
International Journal of Advances in Telecommunications, Electrotechnics, Signals and Systems , 2012, DOI: 10.11601/ijates.v1i1.4
Abstract: Mobile Ad hoc NETwork (MANET) is a wireless net- work of mobile nodes connected by wireless link without a central control. The Medium Access Control (MAC) protocol is one of the important issues in such network, thereby the presented paper will discuss the MAC protocol used in MANET depending on IEEE 802.11 standard which known as Distributed Coordination Function (DCF).However, the limitation of MANET is that, the collision increases with the rise of nodes number. Therefore paper study the MAC protocol using directional antennas to reduce the collisions, increase the range of transmission and largely reduce the interference between the directions. However, the main problem of using directional antennas is caused by frequent node mobility. So the movement plays a vital role in wireless Ad hoc networks to predict the location of MNs.
Cross Layer PHY-MAC Protocol for Wireless Static and Mobile Ad Hoc Networks  [cached]
Sylwia Romaszko,Chris Blondia
EURASIP Journal on Advances in Signal Processing , 2008, DOI: 10.1155/2009/278041
Abstract: Multihop mobile wireless networks have drawn a lot of attention in recent years thanks to their wide applicability in civil and military environments. Since the existing IEEE 802.11 distributed coordination function (DCF) standard does not provide satisfactory access to the wireless medium in multihop mobile networks, we have designed a cross-layer protocol, (CroSs-layer noise aware power driven MAC (SNAPdMac)), which consists of two parts. The protocol first concentrates on the flexible adjustment of the upper and lower bounds of the contention window (CW) to lower the number of collisions. In addition, it uses a power control scheme, triggered by the medium access control (MAC) layer, to limit the waste of energy and also to decrease the number of collisions. Thanks to a noticeable energy conservation and decrease of the number of collisions, it prolongs significantly the lifetime of the network and delays the death of the first node while increasing both the throughput performance and the sending bit rate/throughput fairness among contending flows.
A Review of MAC Protocol for Mobile Ad Hoc Networks
移动Ad Hoc网络MAC协议研究

HE Min,LIU Xing-Song,ZHAO Dong-Feng,

计算机科学 , 2006,
Abstract: A MANET(Mobile Ad-hoc network)is an autonomous non-infrastructure network system of mobile hosts, which are connected with each other via wireless links.It can provide efficient services for data and multimedia applica- tions.However,as we know that the wireless system is a band-limited system,so the channel allocation algorithm is very important.To improve the efficiency,capability and transmission quality of the wireless resource is the key re- search.This paper provides an overview of various MAC protocols for mobile Ad hoc network by presenting their char- acteristics and functionalities,and then provides a comparison and discussion of their respective merits and drawbacks, which cover most types of MANET MAC protocols.Finally,the future research directions are outlined.
An Energy Efficient MAC Protocol for Fully Connected Wireless Ad Hoc Networks  [PDF]
K. Rahimi Malekshan,W. Zhuang,Y. Lostanlen
Computer Science , 2014,
Abstract: Energy efficiency is an important performance measure of wireless network protocols, especially for battery-powered mobile devices such as smartphones. This paper presents a new energy-efficient medium access control (MAC) scheme for fully connected wireless ad hoc networks. The proposed scheme reduces energy consumption by putting radio interfaces in the sleep state periodically and by reducing transmission collisions, which results in high throughput and low packet transmission delay. The proposed MAC scheme can also address the energy saving in realtime traffics which require very low packet transmission delay. An analytical model is established to evaluate the performance of the proposed MAC scheme. Analytical and simulation results demonstrate that the proposed scheme has a significantly lower power consumption, achieves substantially higher throughput, and has lower packet transmission delay in comparison with existing power saving MAC protocols.
Management of Rescue and Relief Operations Using Wireless Mobile Ad Hoc Technology  [PDF]
Lyes. Khoukhi,Soumaya Cherkaoui,Rida Khatoun,Dominique Gaiti
International Journal of Next-Generation Networks , 2010,
Abstract: In this paper, we explore the vital rescue and relief application of wireless mobile ad hoc networks for theemergency situations. The self-organizing and decentralized features of ad hoc networks make themsuitable for a wide variety of applications. We propose to study the efficiency of some routing and MACprotocols under the Client-Server architecture. The presence of dynamic and adaptive routing and MACprotocols will enable ad hoc networks to be formed quickly, and then to ensure efficient and reliablecommunications during the rescue operations. Extensive simulations have been realized to show theimpact of both the routing and MAC choice over multiple QoS parameters (delay, throughput, energy,etc.) in small and large scales rescue areas. We conclude the paper by some remarks that may be veryuseful for government agencies working on the emergency situations to enhance the efficiency of rescueand relief operations using ad hoc networks.
Performance Evaluation of a Novel Fuzzy Based Priority Scheduler for Mobile Ad-hoc Networks and its Effect on MAC Protocols  [PDF]
C. Gomathy,S. Shanmugavel
Information Technology Journal , 2005,
Abstract: As mobile computing gains popularity, the need for Ad-hoc routing will continue to grow. Mobile Ad-hoc network is an autonomous system of mobile wireless nodes connected dynamically without any preexisting infrastructure. Here, since the nodes are mobile, the network topology changes rapidly and unpredictably over time. The QoS routing has challenging problems due to the network`s dynamic topology. The multi hop wireless forwarding of packets, broadcasting of control traffic and the fact that, all nodes may act as routers in addition to being sources and sinks of data in ad-hoc networks produce different Queuing behaviour. Hence, a scheduling algorithm to schedule the packets based on their respective priorities will improvetheperformanceofthenetwork. Here, we present a novel fuzzy based priority scheduler for mobile ad-hoc networks, to determine the priority of the packets. The performance of this scheduler is studied using GloMoSim and evaluated in terms of quantitative metrics such as packet delivery ratio, average end-to-end delay and throughput. It is found that the scheduler provides overall improvement in the performance of the system with three unicast routing protocols when run over different MAC protocols.
A Distributed Mechanism for Handling of Adaptive/Intelligent Selfish Misbehaviour at MAC Layer in Mobile Ad Hoc Networks
Raja Gunasekaran,Vaidheyanathan Rhymend Uthariaraj,Uamapathy Yamini,Rajagopalan Sudharsan,Selvaraj Sujitha Priyadarshini,
Raja Gunasekaran
,Member,IEEE,Vaidheyanathan Rhymend Uthariaraj,Member,IEEE,Uamapathy Yamini,Member,IEEE,Rajagopalan Sudharsan,Member,IEEE,and Selvaraj Sujitha Priyadarshini

计算机科学技术学报 , 2009,
Abstract: Medium access control (MAC) protocols such as IEEE 802.11 are used in wireless networks for sharing of the wireless medium. The random nature of the protocol operation together with the inherent difficulty of monitoring in the open poses significant challenges. All nodes are expected to comply with the protocol rules. But, some nodes in order to gain greater benefits misbehave by not complying with the rules. One such selfish misbehavior is waiting for smaller back-off intervals when compared to the other nodes in the same subnet. Such selfish misbehavior is being tackled in this paper. A diagnosis scheme and a penalty scheme are being proposed for overcoming such selfish-misbehavior at MAC layer of mobile ad hoc networks which could be extended to other types of networks also.
A Survey of the IEEE 802.11 MAC Protocol in Wireless Ad Hoc Networks
无线自组织网络中的IEEE802.11 MAC协议的研究

LI Chun-Shi,WANG Guang-Xing,

计算机科学 , 2007,
Abstract: The IEEE 802.11 MAC protocol is the standard for wireless LANs, it is widely used in test-beds and simulations for wireless multi-hop ad hoc networks. Although it can support some ad hoc network architecture, it is not intended to support the wireless mobile ad hoc network. The simulations show that, given a specific network topology, using table driven router protocol DSDV, there still exit unfairness problem and instability problem among the TCP flows. In this article we reveal the causes of the problem and offer the possible solutions based on network overload.
Broadcasting Traffic Load Performance Analysis of 802.11 MAC in Mobile Ad hoc Networks (MANET) Using Random Waypoint Model (RWM)
jogendra kumar
International Journal of Information and Network Security (IJINS) , 2012, DOI: 10.11591/ijins.v1i3.829
Abstract: Wireless networks are playing a major role in the area of wireless communication. Ad hoc network is a collection of wireless nodes that are communicate from one node to other nodes without using any existing infrasturacture , access point, and centralized network. The wireless communication devices are transmitters, receivers and smart antennas. These antennas can be of any kind and nodes can be fixed or mobile. The term node referred to as, which are free to move arbitrarily in every direction. In this article showing the pefromance of 802.11 MAC on basis of broadcasting traffic load using random waypoint model In wireless mobile ad hoc network (MANET) . this article main aim showing effictive performance of constant bit rate based on broadcasting data from one network to other network. Mainly this article focus on the performance metric such as 80.11 MAC Broadcast packet sent to channel, Packet from network layar, Broadcast packets received, 802.11 MAC Unicast packet sent to channel,Unicast packets received clearly.
A Survey on Mobile Ad Hoc Wireless Network  [PDF]
Samba Sesay,Zongkai Yang,Jianhua He
Information Technology Journal , 2004,
Abstract: This paper presents a coherent survey on ad hoc wireless networks, with the intent of serving as a quick reference to the current research issues in ad hoc networking. It starts with a background on the origin and development stages of ad hoc network, then summaries the characteristics, capabilities, applications and design constraints of ad hoc network fully distinguishing it from traditional networks. The paper discuses a broad range of research issues such as Routing, Medium Access, Multicasting, Quality of service, TCP performance, Energy, Security and Bluetooth, outlining the major challenges which have to be solved before widespread deployment of the technology is possible. Through this survey it would be seen that Ad hoc Networking presence an interesting research area inheriting the problems of wireless and mobile communications in their most difficult form.
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