Wireless medium access control protocols (original) (raw)
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A Survey On Mac Protocols For Wireless Multimedia Networks
International Journal of Computer …, 2011
This article presents a survey on medium access control protocols for wireless multimedia networks. A basic overview of MAC protocol concepts is presented, and a framework is developed for comparisons. The MAC protocols covered in this article include Random Access protocols, Contention less protocols, TDMA CDMA, third-generation WCDMA schemes and Hybrid protocols proposed for wireless Multimedia Networks. The operation of each protocol is explained, and its advantages and disadvantages are presented. Finally, a qualitative comparative outline of the discussed protocols is provided.
A Centralized MAC Protocol with QoS Support for Wireless LANs
2007 IEEE 18th International Symposium on Personal, Indoor and Mobile Radio Communications, 2007
Wireless Local Area Networks (WLANs) are widely used in homes and offices, as well as in public places, mainly as the last mile of an Internet connection, but also as an interconnection between different devices. This extensive usage of WLANs, with the need of modern applications (such as Voice over IP) for high throughput and low transmission delays, impose the necessity for efficient protocols with Quality of Service (QoS) support. In previous work [6] the ability of Multi Carrier-Code Division Multiple Access (MC-CDMA) based Medium Access Control (MAC) protocols to achieve high efficiency has been demonstrated. This paper presents a MAC protocol, based on MC-CDMA that uses an Access Point (AP) to centrally control the network and provide QoS support. Extensive simulation results and a comparison with the standard IEEE 802.11e[3] prove the efficiency of the proposed protocol.
Media Access Control (MAC) Protocols: An Overview
International Journal of Advances in Scientific Research and Engineering (ijasre), 2019
Information Technology has grown rapidly leading to challenges with communicating information with nodes at remote locations. There are many communication media, and certain varieties of wired links such as coaxial cables, where multiple nodes can all be linked to hear each other's transmissions either properly, correctly or with some non-zero probability. Generally, there are two rudimentary ways of sharing such stations or media, which can be the time-sharing, and frequency sharing. This paper tackles the rudimentary question of how such one common communication channel also called a shared medium can be distributed among the distinct nodes with maximum productivity. It analyzes wireless sensor networks and its accompanying technologies sighting their pros and cons. Focusing on time-sharing, we examine methodically two prevalent approaches used in obtaining this which are either by time division (split) multiple access (TDMA) or contention protocols of which both approaches are widely being used in today's systems. It also shows that with proper time of selecting the likelihood exigency of Tame Division Multiple Access's (TDMAs), utilization tends to 1/e (37%) but also tends to increase collision. To adapt the transmitted message likelihood, a format for calculation was adopted. The idea was to seek to gather to the favorable point of value. Slotted Aloha has twice the utilization of Unslotted-Aloha when the numbers of accumulated nodes grow. The Study also shows that each node will stake transmission within sprinkling fixed number of slots and this is guaranteed when using a related distribution in a finite window, but this is not the case with geometric distribution.
Mobile adhoc networks (MANETS) are infrastructureless networks which uses radio signals, to establish communication among mobile nodes. MANET media is open shared media, multiple mobile nodes may access the medium at the same time, which causes various MAC problems. This paper provides a review of various MAC problems being faced by MANETS and various MAC protocols which try to resolve these issues.
A performance comparison of hybrid and conventional MAC protocols for wireless networks
2000
arago amyers s y r o t iuk , z a r u b a @ u t d a l l a s . edu Abstract -Ad hoc networks consist of a group of wireless nodes that dynamically form a multihop network via shared communication channels. For each node, channel access is managed by a media access control (MAC) protocol. MAC protocols can be classified into three broad categories: contention, allocation, and hybrid protocols that combine the contention and allocation access schemes. ADAPT is a hybrid protocol comprised of two component protocolsan allocation protocol that provides stable operation under strenuous network conditions (e.g., high load and nodal degree) , and a contention protocol that dynamically manages the available bandwidth. This paper presents a simulation study that compares the performance of several conventional and hybrid MAC protocols. We examine the relative performance of each protocol under equivalent network conditions, and show that the overall performance of the ADAPT protocol is superior. We also discuss the ability of each protocol to support delay sensitive applications, such as voice, video, and multimedia transmission.
A MAC Protocol with CAC algorithm for Wireless Networks
— Wireless communications has become ubiquitous these days. With the advent of multimedia applications, there is a need for higher bandwidth and faster data rates. A Medium Access Control (MAC) protocol is required for effective utilization of network resources and to transmit multimedia traffic classes with quality of service requirements. In the proposed Dynamic MAC protocol under low load conditions users can access any slots and in high load conditions the owners of the slots have priority to access slots. If the owners are not having any data to transmit the non-owners can access slots. Adaptive Call Admission Control algorithm for multimedia traffic is used to control congestion, which in turn reduces the blocking probability and hence maximizes system capacity. The performance of the proposed protocol is evaluated based on Throughput, Call blocking probability,Capacity.
A new MAC protocol for broadband wireless communications and its performance evaluation
Telecommunication Systems, 2013
This paper presents a new Time Division Multiple Access/Frequency Division Duplexing (TDMA/FDD) based Medium Access Control (MAC) protocol for broadband wireless networks, supporting Quality of Service (QoS) for real-time multimedia applications. It also gives the Call Blocking Probability (CBP), packet end-to-end delay and utilization analysis of different service classes, as they are most essential performance criterions in broadband wireless network assessment. The Connection Admission Control (CAC) mechanism in the proposed MAC efficiently organizes the bandwidth allocation for different service classes by means of a fairness based scheduling algorithm. In addition, the simulation model of the proposed MAC scheme is realized by using OPNET Modeler network simulator. The results of the analytical calculations for the CBPs are compared to those of the simulation of the proposed MAC, thus validity of the MAC protocol is proved.
An adaptive MAC protocol for wireless LANs
Journal of Communications and Networks, 2014
This paper focuses on contention-based Medium Access Control (MAC) protocols used in Wireless Local Area Networks (WLANs). We propose a novel MAC protocol called Adaptive Backoff Tuning MAC (ABTMAC) based on IEEE 802.11 DCF. In our proposed MAC protocol, we utilize a fixed transmission attempt rate and each node dynamically adjusts its backoff window size considering the current network status. We determined the appropriate transmission attempt rate for both cases where the Request-To-Send/Clear-To-Send (RTS/CTS) mechanism was and was not employed. Robustness against performance degradation caused by the difference between desired and actual values of the attempt rate parameter is considered when setting it. The performance of the protocol is evaluated analytically and through simulations. These results indicate that a wireless network utilizing ABTMAC performs better than one using IEEE 802.11 DCF.
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.
2000
The MAC (Medium Access Control) protocols can be roughly categorized into three broad classes [16]. The xed assignment set will have schemes like TDMA, CDMA and FDMA. These proto-cols lack the exibility in allocating resources and thus have problems with con guration changes. This makes them unsuitable for dynamic and bursty wireless packet data networks. The random assignment class consisting