806 research outputs found
On the design of an energy-efficient low-latency integrated protocol for distributed mobile sensor networks
Self organizing, wireless sensors networks are an emergent and challenging technology that is attracting large attention in the sensing and monitoring community. Impressive progress has been done in recent years even if we need to assume that an optimal protocol for every kind of sensor network applications can not exist. As a result it is necessary to optimize the protocol for certain scenarios. In many applications for instance latency is a crucial factor in addition to energy consumption. MERLIN performs its best in such WSNs where there is the need to reduce the latency while ensuring that energy consumption is kept to a minimum. By means of that, the low latency characteristic of MERLIN can be used as a trade off to extend node lifetimes. The performance in terms of energy consumption and latency is optimized by acting on the slot length. MERLIN is designed specifically to integrate routing, MAC and localization protocols together. Furthermore it can support data queries which is a typical application for WSNs. The MERLIN protocol eliminates the necessity to have any explicit handshake mechanism among nodes. Furthermore, the reliability is improved using multiple path message propagation in combination with an overhearing mechanism. The protocol divides the network into subsets where nodes are grouped in time zones. As a result MERLIN also shows a good scalability by utilizing an appropriate scheduling mechanism in combination with a contention period
WIRELESS LOCAL AREA NETWORK CONCEPTUAL DESIGN AND PLANNING IN CAMPUS (PRACTICE IN UTP)
Wireless communication is currently in a state of rapid evolution. This evolution is
driven by the numerous advantages of the wireless networks. Wireless Local Area
Network (WLAN) is one of the new networking environments where it supports
the mobility of the network user without being encumbered by the existing cable.
Since the current Local Area Network (LAN) in Universiti Teknologi PETRONAS
(UTP) is fairly growth with good performance reliability, shifting the current
setup to WLAN is locally accepted. This will benefit all the UTP users including
students, respective lecturers, and beneficial for administration line of staff. The
current planning and setup will cover certain stages in order to build a high
reliability and best performance of the WLAN environment. Data transmission
and signal strength for the area is practically surveyed in order to obtain best
performance and ability to transmit data in bit per second required.
Research and questionnaire have also been done throughout the UTP students and
IT Media Services Executives, in orderto determine the best design concept to be
applied in UTP campus and to determine the best place for WLAN to be
implemented. Usage models are required in order to support the activity that
will be in the WLANenvironment. The conceptual designofWLAN environment
will cater the area of the student residential including the Student Centre, cafeteria
and student residential. With the design, location of all the devices such as the
wireless access point (AP) and security access point (SAP) to roam the signal
coverage and to secure the signal for data transmission can be determined. The
technology used in data transmission is also being covered in this research paper,
which includes the Spread Spectrum LAN. To ensure the system meets the
budgeted cost, the author came out with the budgeting plan for all the devices
allocated for the WLAN setup. The WLAN planning and setup in UTP will help
the UTP management in getting the idea to implement a WLAN environment
insidethe campusas wellto compliance with the currentLANsetup
QUALITY-OF-SERVICE PROVISIONING FOR SMART CITY APPLICATIONS USING SOFTWARE-DEFINED NETWORKING
In the current world, most cities have WiFi Access Points (AP) in every nook and corner. Hence upraising these cities to the status of a smart city is a more easily achievable task than before. Internet-of-Things (IoT) connections primarily use WiFi standards to form the veins of a smart city. Unfortunately, this vast potential of WiFi technology in the genesis of smart cities is somehow compromised due to its failure in meeting unique Quality-of-Service (QoS) demands of smart city applications. Out of the following QoS factors; transmission link bandwidth, packet transmission delay, jitter, and packet loss rate, not all applications call for the all of the factors at the same time. Since smart city is a pool of drastically unrelated services, this variable demand can actually be advantageous to optimize the network performance. This thesis work is an attempt to achieve one of those QoS demands, namely packet delivery latency. Three algorithms are developed to alleviate traffic load imbalance at APs so as to reduce packet forwarding delay. Software-Defined Networking (SDN) is making its way in the network world to be of great use and practicality. The algorithms make use of SDN features to control the connections to APs in order to achieve the delay requirements of smart city services. Real hardware devices are used to imitate a real-life scenario of citywide coverage consisting of WiFi devices and APs that are currently available in the market with neither of those having any additional requirements such as support for specific roaming protocol, running a software agent or sending probe packets. Extensive hardware experimentation proves the efficacy of the proposed algorithms
An overview of emergency communication networks
In recent years, major natural disasters and public safety accidents have frequently occurred worldwide. In order to deal with various disasters and accidents using rapidly deployable, reliable, efficient, and stable emergency communication networks, all countries in the world are strengthening and improving emergency communication network construction and related technology research. Motivated by these situations, in this paper, we provide a state-of-the-art survey of the current situation and development of emergency communication networks. In this detailed investigation, our primary focus is the extensive discussion of emergency communication network technology, including satellite networks, ad hoc networks, cellular networks, and wireless private networks. Then, we explore and analyze the networks currently applied in emergency rescue, such as the 370M narrowband private network, broadband cluster network, and 5G constellation plan. We propose a broadband-narrowband integrated emergency communication network to provide an effective solution for visual dispatch of emergency rescue services. The main findings derived from the comprehensive survey on the emergency communication network are then summarized, and possible research challenges are noted. Lastly, we complete this survey by shedding new light on future directions for the emergency communication network. In the future, the emergency network will develop in the direction of intelligence, integration, popularization, and lower cost, and space-air-ground-sea integrated networks. This survey provides a reference basis for the construction of networks to mitigate major natural disasters and public safety accidents
ACUTA Journal of Telecommunications in Higher Education
In This Issue
Strategic Planning in the College and University Ecosystem
Outlook 2012: Chickens or Eggs?
lT Trends on Campus: 2012
Best Practices in Deploying a Successful University SAN
Beyond Convergence: How Advanced Networking Will Erase Campus Boundaries
Distributed Computing: The Path to the Power?
Cell Phones on the University Campus: Adversary or Ally?
lnstitutional Excellence Award Honorable Mention: Wake Forest University
Interview
President\u27s Message
From the Executive Director
Here\u27s My Advic
ACUTA Journal of Telecommunications in Higher Education
In This Issue
Wireless Andrew
Colleges Take to the Air
Wireless LANs: Coming to a Campus Near You?
Going Wireless for Last-Mile Connectivity
Cutting the Wires: Wireless Research at Michigan Tech
Communicating on a Beam of Light
Remote Access at Amherst College
Institutional Excellence Award: Michigan Technological University
Interview
Profile
Columns
Book Revie
Performance Study of Hybrid Spread Spectrum Techniques
This thesis focuses on the performance analysis of hybrid direct sequence/slow frequency hopping (DS/SFH) and hybrid direct sequence/fast frequency hopping (DS/FFH) systems under multi-user interference and Rayleigh fading. First, we analyze the performance of direct sequence spread spectrum (DSSS), slow frequency hopping (SFH) and fast frequency hopping (FFH) systems for varying processing gains under interference environment assuming equal bandwidth constraint with Binary Phase Shift Keying (BPSK) modulation and synchronous system. After thorough literature survey, we show that hybrid DS/FFH systems outperform both SFH and hybrid DS/SFH systems under Rayleigh fading and multi-user interference. Also, both hybrid DS/SFH and hybrid DS/FFH show performance improvement with increasing spreading factor and decreasing number of hopping frequencies
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