Topology, Medium Access, and Performance

2005 ◽  
pp. 501-579 ◽  
Keyword(s):  
Medium Access ◽  
And Performance

Lending a Hand

2013 ◽  
pp. 1-29
Author(s):  
George T. Karetsos
Keyword(s):  
Communication Systems ◽  
Performance Metrics ◽  
Control Design ◽  
Medium Access ◽  
Design And Implementation ◽  
Data Rates ◽  
Capacity Bounds ◽  
Cooperative Networking ◽  
Outage Probabilities ◽  
And Performance

Cooperative networking is considered one of the main enablers for achieving enhanced data rates in wireless communications. This is due to the fact that through cooperation the adverse effects of fading can be alleviated significantly. Thus, more reliable communication systems deployments can be devised, and performance enhancements can be achieved. In this chapter, the authors discuss the main aspects of cooperative networking starting from the main historical milestones that shaped the idea. Then they focus on the main mechanisms and techniques that foster cooperation and continue by studying performance metrics for various possible deployments, such as capacity bounds and outage probabilities. Finally, the authors take a more practical viewpoint and discuss aspects related to medium access control design and implementation that can serve as a stepping stone for the widespread deployment of cooperative networking.

MAC and Routing Protocols for Vehicle to Vehicle Communications

2010 ◽  
pp. 105-119
Author(s):  
Xiaobo Long ◽  
Biplab Sikdar
Keyword(s):  
Routing Protocols ◽  
Intelligent Transportation Systems ◽  
Communication Systems ◽  
Transportation Systems ◽  
Node Mobility ◽  
Medium Access ◽  
High Data ◽  
Vehicle To Vehicle ◽  
And Performance ◽  
Access To Data

Numerous efforts are currently under progress to enhance the safety and efficiency of vehicular traffic through intelligent transportation systems. In addition, the growing demand for access to data and information from human users on the go has created the need for advanced vehicle-to-vehicle and vehicleto- roadside communication systems capable of high data rates and amenable to high degrees of node mobility. Vehicular communications and networks are expected to be used for a number of purposes such as for enabling mobile users to transfer data and information from other networks such as the Internet and also for implementing services such as Intersection Decision Systems (IDS), Automated Highway Systems (AHS), and Advanced Vehicle Safety Systems (AVS). In this chapter the authors describe medium access control (MAC) and routing protocols for vehicular networks and the various factors that affect their design and performance.

Network Design and Performance Evaluation of Wireless Sensor Network for Precision Agriculture

2015 ◽  
pp. 56-82
Author(s):  
Herman S Sahota ◽  
Ratnesh Kumar ◽  
Ahmed E Kamal
Keyword(s):  
Wireless Sensor Networks ◽  
Sensor Networks ◽  
Precision Agriculture ◽  
Mac Protocol ◽  
Wireless Sensor ◽  
Medium Access ◽  
Network Layer ◽  
Challenges And Opportunities ◽  
Multiple Power ◽  
And Performance

This chapter explores the design of wireless sensor networks for applications in precision agriculture. A short review of developments in precision agriculture and recent applications of wireless sensor networks in the area is presented. The authors present their design of medium access control and network layer protocols exploring the challenges and opportunities associated with the design of such a networked system. The physical layer in their network allows multiple power modes in both receive and transmit operations. The MAC layer employs these multiple power modes to implement a novel wake-up synchronization mechanism to reduce the energy overhead. The network layer ensures reliable collection of data while balancing the energy consumption among the nodes. Finally, the authors present an analytical approach to model the behavior of the MAC protocol developed and compare it against the duty-cycle based S-MAC protocol. The results are also confirmed using simulations.

A Fiber-Optic Network Protocol for Computer Integrated Manufacturing

1992 ◽  
Vol 114 (3) ◽  
pp. 345-351
Author(s):  
A. Ayyagari ◽  
A. Ray
Keyword(s):  
Fiber Optic ◽  
Computer Integrated Manufacturing ◽  
Network Protocol ◽  
Application Layer ◽  
Medium Access ◽  
Integrated Manufacturing ◽  
Manufacturing Automation ◽  
Fiber Optic Network ◽  
And Performance ◽  
Optic Network

This paper presents the architecture and performance analysis of a fiber-optic-based network protocol for computer integrated manufacturing (CIM). Its adaptation as the common medium access control (MAC) layer protocol in the fiber-optic-based version of the Manufacturing Automation Protocol (MAP) and Technical and Office Protocols (TOP) will make their specifications identical up to the presentation layer; only the application layer which is user specific could be different.

scholarly journals Decoupling-Based Channel Access Mechanism for Improving Throughput and Fairness in Dense Multi-Rate WLANs

2019 ◽  
Vol 12 (1) ◽  
pp. 3 ◽  
Author(s):  
Jianjun Lei ◽  
Ying Wang ◽  
Hong Yun
Keyword(s):  
Data Transmission ◽  
Local Area ◽  
Access Time ◽  
Channel Access ◽  
Distributed Coordination ◽  
Medium Access ◽  
Performance Anomaly ◽  
Network Utilization ◽  
Free Data ◽  
And Performance

Legacy IEEE 802.11 Medium Access Control (MAC) adopts the Distributed Coordination Function (DCF) mechanism, which provides the same access opportunity for all contenders. However, in dense multi-rate Wireless Local Area Networks (WLANs), the pure distributed control mechanism will cause high collision rate and performance anomaly, which results in low network utilization and wasting valuable channel resources. In this paper, we present a decoupling MAC mechanism (DMAC) based on the idea of contention/reservation to reduce collision and realize collision free data transmission. In proposed mechanism, the channel access time is partitioned into channel contention process and data transmission process. The proposed algorithm makes full use of the distributed random channel access mechanism and performs a centralized collision-free data transmission. Wherein, we also design an adaptive algorithm to adjust the length of the contention period to improve the channel utilization. Furthermore, we further propose two airtime fairness algorithms Improve-DMAC1 (I-DMAC1) and Improve-DMAC2 (I-DMAC2) for delay sensitive network and high throughput network scenarios, respectively, to solve the performance anomaly in multi-rate WLANs, based on DMAC. We verify the effectiveness of these decoupling algorithms through extensive simulations. Moreover, the simulation results show that the proposed algorithms achieve better performance than the 802.11 standard and other protocols.

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