Achieving Enhanced Throughput in Mobile ADHOC Network Using Collision Aware MAC Protocol (original) (raw)
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ADVANCED AND EFFICIENT MAC PROTOCOL FOR MOBILE AD-HOC NETWORK.
International Journal of Advanced Research (IJAR), 2018
Mobile Ad-hoc Network (MANET) is an autonomous system of mobile nodes connected by wireless links. The nodes are free to move about and organize themselves into a network. These nodes change position frequently. To accommodate the changing topology special routing algorithms are needed. The Media Access Control (MAC) data communication protocol sub-layer provides addressing and channel access control mechanisms that make it possible for network nodes to access common wireless channel through distributed coordination function (DCF).This work proposes a new power controlled MAC protocol based on IEEE 802.11. Network Simulator 2 (NS2) has been used for simulation. It saves considerable amount of power and achieves the performance matching with that of IEEE 802.11
Performance Evaluation of Priority based Contention- MAC in Mobile Ad-Hoc Networks
2013
The communication through wireless media is in very much demand because of high mobility of the users and establishing ad hoc network in emergency situations, which requires the designing of an efficient and priority based MAC (Medium Access Protocol) to support quality of service in MANET (Mobile Ad hoc Networks) adequately. MAC is the base layer, which is required to catch up the system performance especially in mobile ad hoc wireless network. There are various MAC standards used in MANET. The IEEE 802.11 is one of them and most frequently applied to such networks presently. We found that the IEEE 802.11 MAC standard is not very much suitable into wireless network scenario because its poor performance and not satisfactorily addressing the critical issues of networking like priority based transmission across the nodes results in lower throughput, higher delay and poor fair access of cannels. In this paper, we propose a dynamic PBC-MAC protocol for wireless ad hoc networks- named as...
Performance Analysis of Collision Avoidance MAC Protocol in Multi-Hop Wireless Ad-Hoc Network
International Journal of Network and Mobile Technologies, 2011
Performance analysis of 802.11Medium Access Control (MAC) protocol has been carried out either by means of simulation or by means of analytical models with simplified back-off rule assumptions. Binary Exponential Back-off (BEB) is the widely used back-off mechanism in many contention-based IEEE 802.11 MAC protocols for its simplicity and good performance, but it has drawbacks especially in multi-hop ad hoc network and some new back-off schemes such as Multiplicative Increase and Linear Decrease (MILD) and Double Increment Double Decrement (DIDD) were proposed. This paper, investigate the performance of collision avoidance MAC protocol in multi-hop wireless ad-hoc network by adopting MILD back-off mechanism. A three state Markov chain is used to model the channel states and node states. These models were used to derive the duration time, steady-state probabilities of the states of node and throughput of Mobile Ad-hoc NETwork (MANET). Simulation results show no matter the value of average number of neighbors , transmission range , and length of DATA frames , the throughput of MANET always achieves the maximum value at some point of persistent probability and also the throughput of a MANETs increases with increase in persistent probability which is influenced by the number of neighbors, transmission range and length of DATA frame. On the other hand the throughput decreases with increase in sensing range which is also influenced by the number of neighbors, transmission range and length of DATA frame.
A hybrid multi-channel MAC protocol for wireless ad hoc networks
Wireless Networks, 2014
In a regular wireless ad hoc network, the Medium Access Control (MAC) protocol coordinates channel access among nodes, and the throughput of the network is limited by the bandwidth of a single channel. The multi-channel MAC protocols can exploit multiple channels to achieve high network throughput by enabling more concurrent transmissions. In this paper, we propose a hybrid and adaptive protocol, called H-MMAC, which utilizes multi-channel resources more efficiently than other multi-channel MAC protocols. The main idea is to adopt the IEEE 802.11 Power Saving Mechanism and to allow nodes to transmit data packets while other nodes try to negotiate the data channel during the Ad hoc Traffic Indication Message window based on the network traffic load. The analytical and simulation results show that the proposed H-MMAC protocol improves the network performance significantly in terms of the aggregate throughput, average delay, fairness and energy efficiency.
2005
Mobile ad hoc networks require a complex management to efficiently exploit the networks resources. The capacity of these networks is determined by the capability of the medium access control mechanism to handle the access process and to achieve high resource reuse. The ADHOC MAC protocol allows to devise effective broadcast and point-to-point services for wireless ad hoc networks. However, this efficiency is lessened in a realistic interference scenario. In this paper we propose a dynamic strategy for reserving point-to-point resources capable of partially overcoming the problems stemmed from the realistic interfering nature of the shared wireless medium and we evaluate its performance through detailed simulation.
AdAMAC: A New MAC Protocol for High Traffic Wireless Networks
Procedia Computer Science, 2013
Medium access control is a key problem in wireless ad hoc and sensor networks. An efficient medium access control algorithm allows nodes to share the wireless medium at a lower energy cost and achieve a higher throughput. Most existing medium access control techniques for wireless networks are designed to work well under low traffic rates. In this paper we propose a new medium access control algorithm AdAMAC for wireless ad hoc and sensor networks under relatively high traffic rates. We demonstrate using simulations that AdAMAC outperforms the best medium access control algorithms designed for higher traffic rates in terms of packet delivery ratio and latency and has a similar energy cost to them.
An enhanced multi-channel MAC protocol for wireless ad hoc networks
2012 14th Asia-Pacific Network Operations and Management Symposium (APNOMS), 2012
In the wireless ad hoc network, utilizing the multiple channels at Medium Access Control (MAC) layer is on of the key techniques to improve the network performance. It can be done by multi-channel MAC to utilize the channels resource as much as possible. Wireless nodes are usually powered by battery and thus are limited in power capacity. The IEEE 802.11 Power Saving Mechanism (PSM) is used to conserve energy for the ad hoc networks by allowing nodes to enter doze mode when there is no need for data exchange. In this paper, we propose a hybrid and adaptive protocol, named H-MMAC, by adopting IEEE 802.11 PSM. In H-MMAC, nodes exchange control messages on default channel to negotiate the data channel during the ATIM (Ad hoc traffic Indication Message) window. The difference of H-MMAC compared to other multi-channel MAC protocols is that the other nodes can transmit data packets on data channels based on the network traffic load. This means H-MMAC can utilize the channel resources more efficiently. The simulation results show that our proposed H-MMAC improves the network performance significantly in terms of aggregate throughput, average delay and energy efficiency. Index Terms-Multi-channel, MAC protocol, Ad hoc networks.
Effect of Medium Access Control (MAC) on the Throughput of Multi-Hop Wireless Ad-Hoc Network
Journal of Engineering and Applied Sciences, 2011
Medium Access Control (MAC) protocol is the main element that determines the efficiency in sharing the limited communication bandwidth of the wireless channel in IEEE 802.11 wireless networks. This paper, investigate the effect of MAC on throughput of multi-hop wireless adhoc network. A Markov chain is used to model a collision avoidance MAC protocol for multihop wireless ad-hoc networks. In the models, two fundamental issues in MAC, i.e., collisions and spatial reuse in terms of persistent probability, sensing range and back-off time mechanism were considered. Simulation results show that collision avoidance MAC mechanism such as persistent probability; sensing range and back-off time have significant effects on the performance of multi-hop wireless ad hoc networks. The effects of these MAC mechanisms were influenced by the number of neighbors, transmission range and length of data frame. It is observed that throughput increases with increase in persistent probability and also effect of sensing range on the throughput is weakening when the transmission range is short. Similarly throughput increases with increase in sensing range and back-off time when number of neighbors increases. On the other hand throughput decreases with increase sensing range and back-off time when transmission range increases
Implementation of IEEE 802.11 MAC Protocol in AD-HOC Network through Various Parameters
IEEE 802.11 MAC protocol is standard for wireless local area networks (LANs), and has also been implemented in many network simulations for wireless multichannel ad hoc networks. However, it is well known that, as the number of active channel increases, the performance of IEEE 802.11 MAC in terms of delay and throughput is decreased especially when each station load approaches its saturation state. Since delay and throughput are important Quality of Service parameters in many wireless applications, we study the performance of different multi-channel Media Access Control (MAC) protocols in ad hoc networks by considering various parameters. This paper presents a new approach for performance evaluation of IEEE 802.11 medium access control MAC protocol for ad-hoc wireless network. The approach based on implementation of IEEE 802.11 MAC protocol in various parameters are calculated such as throughput and minimum access delay on varying number of nodes of IEEE 802.11 protocol which is a standard MAC protocol. The accuracy of the analytical result is verified by NS-2 software tool.
An Improved MAC Protocol to Reduce Packet Loss and Energy Wastage in Ad-Hoc Networks
An Ad-Hoc network is a wireless, decentralized, dynamic network in which devices associate with each other in their link range, in which the basic 802.11 MAC protocol uses the Distributed Coordination Function (DCF) to share the media between various devices. But use of 802.11 MAC protocol in Ad-Hoc networks affected by different issues such as restricted power capacity, packet loss because of transmission error, various control traffic and failure to avoid packet collision. To solve these problems various protocols have been proposed. But we don’t have any perfect protocol which can resolve the issues related to power management, packet collision and packet loss efficiently. In this research paper, we suggest a new protocol to adjust the upper & lower bounds for the contention window to decrease the number of collisions. As well as it proposes a power control scheme, triggered by the MAC layer to reduce the packet loss, energy wastage and decrease the number of collisions during transmission. The proposed MAC protocol is implemented and performance is compared with existing 802.11 MAC protocol. We computed the Packet Delivery Fraction(PDF), average End-to-End(e-e) delay, average throughput and packet loss in several conditions. We find proposed protocol is comparatively improved than the existing protocol.