Wireless LAN Technology Research Articles

Rancang Bangun Jaringan Hotspot Menggunakan LINUX ClearOS Dengan Konsep Security Gateway

Hotspot checks certain places (usually public places) that have Internet services with wireless LAN technology, like universities, shopping malls, squares, libraries, restaurants or airports. Internet services like these are available for a fee and free. a sensible approach is required to manage server protection, namely by protecting the prevailing network. Where there's level of security to secure access and access rights to existing hotspots. A gateway may be a tool that's wont to connect a network to at least one or more computer networks that use different communication protocols, so information from an system is provided to other computer networks that use different protocols. to form this method, the author uses Linux ClearOS for the protection concept. this method is applied to the case study of PT. XYZ, which uses the hotspot. The author describes how security systems are installed and built on network servers, and describes gateways as network infrastructure. so the present hotspot medium can maximize its working system by using Linux software, which is another hotspot.

Performance analysis of fingerprinting indoor positioning methods with BLE

Indoor positioning with smartphone-compatible technologies has fostered much research attention in recent years. In this context, Bluetooth Low Energy (BLE) reveals a good performance for this type of task. It offers more flexibility and better achievements when compared with similar systems based on IEEE 802.11 Wireless LAN (Wi-Fi) technology, especially for fingerprinting-based positioning systems. The literature on these systems is rich and growing; however, not all its possible algorithms have been tested and compared under similar conditions for this emergence technology.This work presents a thorough analysis of the state of the art on Wi-Fi and Bluetooth Low Energy (BLE) algorithms used for fingerprinting systems. Based on this study, a novel scheme for fingerprinting methods classification is proposed. Then, a performance comparison between the Bluetooth Low Energy (BLE) databases is carried out, assessing training time, parameter optimization, computational time, and positioning accuracy. For the sake of completeness, a new database is provided and compared with the others to analyze how the environment can affect the accuracy of each method. The results show that those techniques based on the Weighted k-Nearest Neighbours (Wk-NN) algorithm perform better on average for large scale deployments; besides, they do not require any previous training and consume less time to optimize their parameters. On the other hand, Support Vector Machines (SVM) provides the best accuracy with less computational and training time in small environments.

Optimasi Radius Server untuk Pengaturan Alokasi Bandwidth pada Jaringan Hotspot

Hotspot is one form of utilizing Wireless LAN technology that can be used to access internet services and is usually found in public areas such as libraries, campus internet parks, or offices. Aspects that need to be considered in hotspots to make users feel comfortable is security then at the provider side, the aspect that needs to be considered is the regulation of bandwidth allocation to optimize the data transfer speeds that the network and to prevent the possibility of dense network traffic. RADIUS server is one type of server that can be used at hotspots to secure hotspots because it supports various types of encryption. In this study, optimization of the settings for hotspot network bandwidth is optimized by integrating the RADIUS server with RouterOS. Bandwidth allocation management is done by determining the active time of a user account and set quotas hotspot uploads and downloads for the account. The results obtained from this study indicate that when a hotspot user account has passed the active time or has passed the upload quota and the download given, the account will be deleted from the list of hotspot user accounts or disabled.

Switched Low-Noise Amplifier Using Gyrator-Based Matching Network for TD-LTE/LTE-U/Mid-Band 5G and WLAN Applications

This paper presents a triple-band low-noise amplifier (LNA) fabricated using a 0.18 μm Complementary Metal-Oxide-Semiconductor (CMOS) process. The LNA uses a double-peak load network with a switched component to accomplish the triple-band operation. Moreover, noise reduction using a substrate resistor to ameliorate the noise performance is presented. Noise reduction of 1.5 dB can be achieved at 2.5 GHz without additional dc power and extra manufacturing costs. An input matching technique is realized simultaneously using a gyrator-based feedback topology. The triple-band LNA can be realized by using a dual-band input network with a switched matching mechanism. The target frequencies of the triple-band LNA are 2.3–2.7 GHz, 3.4–3.8 GHz, and 5.1–5.9 GHz, covering the operating frequency bands of time-division long-term evolution (TD-LTE), mid-band Fifth-generation (5G), LTE-unlicensed (LTE-U) band, and Wireless LAN (WLAN) technology. The measured power gains and noise figures at 2.5, 3.5, and 5.2 GHz are 12.3, 15.3, and 13.1 dB and 2.3, 2.2, and 2.6 dB, respectively.

Terminal handover in software-defined WLANs

With the development of wireless LAN (WLAN) technology, wireless access points (APs) are deployed increasingly more and the number of mobile terminals is increasing. It is normal for a mobile terminal to hand over its AP. The traditional terminal handover method cannot effectively control the handover delay and balance the network load due to the inherent drawbacks such as closed encapsulation and the lack of centralized control. In this paper, we introduce the innovative network architecture of software-defined networking (SDN), propose a software-defined WLAN architecture, and propose a seamless handover method and a load balancing handover method of the software-defined WLAN. Experimental results show that the proposed handover method effectively reduces the handover delay, balances the network load, and improves the quality of service (QoS) and resource utilization of the network.

JARINGAN AD-HOC VEHICULAR (VANET) : TINJAUAN TENTANG ARSITEKTUR, KARAKTERISTIK, APLIKASI, DAN PROTOKOL MEDIUM ACCESS CONTROL (MAC)

VANET (Vehicular Ad-hoc Network) is an ad-hoc wireless network which nodes are composed by mostly moving vehicles and infrastructure communications or access points along the road. It integrates adhoc networking, cellular technology, wireless LAN and other technologies, which include GPS(Global Positioning System), digital mapping, sensing technologies and advanced information processing tools to support Intelligent Traffic Systems (ITS). VANET is developed mainly to improve road safety and to increase the traffic efficiency. It is designed to support the exchange of warning messages among the vehicles to increase the passenger safety and other information related to VANET applications and services . To achieve these goals, there are several issues that should be addressed. One of these challenges is designing reliable and efficient Medium Access Control (MAC) protocol for VANET. Due to VANET’s distinguishing characteristics, such as high mobility of the nodes, dynamic network topology, enough battery power, high processing power, etc, the MAC protocols designed for MANET (Mobile Ad-hoc Network) are not suitable for VANET. The research community has been working to develop MAC protocols appropriate for this ad-hoc network by proposing new design or modifying the existing one.In this paper, the VANET’s architecture, characteristics, applications and standard are discussed and then a comprehensive study of several MAC protocols available in the literature is presented.

ANALISIS PERBANDINGAN PERFORMANSI TRANSMISI VIDEO DENGAN UNICAST PADA WLAN IEEE 802.11ac

<p>Network technology is now advancing with increasing speed of data provided. This is spurred by the rapid increase in real time data needs in various fields such as education, entertainment, sports and for business purposes. With the IEEE 802.11ac Wireless LAN technology, users will be easier to access information such as streaming video. But this is very dependent on the area of the wireless LAN network coverage available in a building or campus environment. The capture power of Access Point signals in one location will be different from other locations, so the quality of the resulting video streaming is different for each location. This study aims to analyze the performance of two different video formats, namely MPEG-4 and H.264. The research method of MPEG-4 and H.264 streaming video transmission through IEEE 802.11ac WLAN uses experimental methods for performance evaluation of two different protocols HTTP and UDP based on parameters of delay, packet loss and throughput. After doing the research, then getting the results using the HTTP protocol all the parameters are better for the H.264 format video, whereas for the UDP protocol all the parameters are better used for the type of video format MPEG 4.</p>

New Trends in Wireless LAN and Cooperative Wireless LAN Technology

New Trends in Wireless LAN and Cooperative Wireless LAN Technology

Research on Matrix-type Packet Loss Compensation Scheme for Wireless Video Transmission on Subway

As the mainstream wireless LAN technology, Wi-Fi can achieve fast data transfer. With the subway moving in a high speed, video data transmission between the metro and the ground is achieved through Wi-Fi technology. This paper aims at solving the Caton problem caused by switching packet loss in the process of playing real-time video on the train terminal, and proposes matrix-type packet loss compensation scheme. Finally, the feasibility of the scheme is verified by experiments.

An Investigation on Wireless Mobile Network and Wireless LAN (Wi-Fi) for Performance Evaluation

The convergence of wireless mobile technologies and Internet allows compelling possibilities for future applications due to the new advancement, constantly growing and personalized services in the mobile communication. 3G (third generation) and Wi-Fi are major wireless technologies that are used by most people today. The two most important phenomena impacting telecommunications over the past decade have been explosive parallel growth of both the internet and mobile telephone services. The internet brought the benefits of data communications to the masses with email, the web, and ecommerce; while mobile service has enabled follow-me anywhere/always telephony. The Internet helped accelerate the trend from voice centric to data-centric networking. The scope of this research is to carry out extensive study with respect to two wireless technologies that are likely to play important roles: Third Generation mobile (3G) wireless mobile network and Wireless Local Area Networks (Wi-Fi). The performance will be evaluated in different operating environment with the use of various analytical techniques. Focus will be given on 3G wireless mobile network as embodied by the IMT-2000 family of standards and Wireless LAN technology embodied by the WiFi or 802.11b standard which is the most popular and widely deployed of the Wireless LAN technologies.

Scalable Synchrophasors Communication Network Design and Implementation for Real-Time Distributed Generation Grid

There has been a growing interest in the deployment of phasor measurement units (PMUs) not only in high-voltage transmission, but in lower-voltage distribution systems. For a distributed generation (DG) grid, this would require deployment of PMUs at critical locations, which implies accurate phase measurement with the support of a low delay, highly reliable network infrastructure. In the absence of such a network, the most cost-effective solution would be to consider a wireless network to support centralized control for situational awareness in the transmission, as well as the DG grid environment. Therefore, the main objective in this paper is to design and implement a scalable synchrophasor network using wireless LAN technology to assess network performance and requirements under real-world conditions. To achieve this, we have designed an emulation platform that can support physical and medium access control layers. The data communication at the application is based on the IEEE C37.118-2011-2 Standard. By considering a hierarchical network architecture for our testbed implementation, we propose an efficient method to reduce bandwidth, as well as provide capabilities for control and management at each hierarchical level. In addition, an efficient tree-based multihop routing protocol has been designed to match a specific distribution feeder structure. The testbed is then used to access different network configurations under various test conditions.

A New Mechanism for Network Monitoring and Shielding in Wireless LAN

Wireless LAN (WLAN) technology is developing rapidly with the help of wireless communication technology and social demand. During the development of WLAN, the security is more and more important, and wireless monitoring and shielding are of prime importance for network security. In this paper, we have explored various security issues of IEEE 802.11 based wireless network and analyzed numerous problems in implementing the wireless monitoring and shielding system. We identify the challenges which monitoring and shielding system needs to be aware of, and then provide a feasible mechanism to avoid those challenges. We implemented an actual wireless LAN monitoring and shielding system on Maemo operating system to monitor wireless network data stream efficiently and solve the security problems of mobile users. More importantly, the system analyzes wireless network protocols efficiently and flexibly, reveals rich information of the IEEE 802.11 protocol such as traffic distribution and different IP connections, and graphically displays later. Moreover, the system running results show that the system has the capability to work stably, and accurately and analyze the wireless protocols efficiently.

船内無線LAN技術について

船内無線LAN技術について

Research on Intelligent Monitoring System of Fangcheng Port's Bulk Cargo Ship Unloader

To intelligently monitor port machinery state of logistics operation in western China and to meet the stringent needs for future development of Fangcheng Port‘s business, the paper studies intelligent monitoring system of Fangcheng Port’s bulk cargo ship unloader. It consists of monitoring requirements analysis, system architecture design, software function design, key technology research, etc. The monitoring functions focus on the real-time monitoring of ship unloaders’ working state, fault information management, work load query, statistical report of work load, etc. In such a monitoring system, the wireless base stations and wireless LAN technology are used to achieve the collection and transmission of real-time monitoring information. This system has been operated in 14# and 15# ship unloaders of Fangcheng Port.

On IEEE 802.11: Wireless Lan Technology

Network technologies are traditionally based on wireline solutions. But the introduction of the IEEE 802.11 standards have made a huge impact on the market such that laptops, PCs, printers, cellphones, and VoIP phones, MP3 players in our homes, in offices and even in public areas have incorporated the wireless LAN technology. Wireless broadband technologies nowadays provide unlimited broadband access to users which were previously offered only to wireline users. In this paper, we review and summarize one of the emerging wireless broadband technology i.e. IEEE 802.11,which is a set of physical layer standard for implementing wireless local area network computer communication in the 2.4,3.6,5 and 60GHz frequency band. They fix technology issues or add functionality which is expected to be required by future applications. Though some of the earlier versions of these technologies are obsolete (such as HiperLAN) now but still we have included them in this review for the sake of completeness.

Time-slot based event-driven network switch control for information sharing in multiple WLANs

Recent wireless LAN technologies and service management technologies have produced widely diverse network services with no configuration task or effort for end-users' consumer electronics (CE) devices. This environment needs a mechanism that enables end-users to access services seamlessly across separated networks. To provide such accessibility, information for services in multiple networks should be available in each terminal that is currently connected to a wireless LAN. This paper presents a proposal of a new mechanism to collect and manage service information belonging to different WLANs autonomously for end-users. Specifically, an autonomous network switch and event-driven service information sharing scheme are proposed. The functionalities which are embedded on end-user CE devices require no central control device on a WLAN or the internet and require no modification of WLAN access points. The effectiveness of the proposal is demonstrated using simulation experiments. Future work is described.

Two-Tier CHORD for Decentralized Location Management

To conceive the full potential of ubiquitous mobile computing, mobile nodes must be able to roam seamlessly across different networks. However, the location i.e. IP address, of a called mobile nodes must be determined within a certain amount of time, before the services are blocked. With the upcoming 3G, 4G and wireless LAN technologies, it is necessary to have an efficient location management system that adapts to such dynamic environments, and augment problems like center point of failure, delay and lack of reliability. One approach is to provide decentralized location management, using CHORD, whose key vale mapping can efficiently determine the required name to IP mapping. However, a major issue concerning this technique is the presence of unstable chord nodes, which brings instability to the framework. Nodes with minimum computation capabilities can slow down the lookup mechanism, and hence terminates the ongoing session. This paper provides a solution to this problems using well-known two-tier CHORD architecture. Nodes with high computation power and stability will act as Location Servers, which will be responsible for storing and distributing temporary locators i.e. IP addresses of the called mobile node. Suitability of the proposed framework is tested using analytical analysis in comparison with the existing chord mobility framework. Such an approach can bring stability to the framework, with its decentralization feature still intact.

무선랜 환경에서 보안을 고려한 효율적 전송성능 향상에 관한 연구

Recently, new technologies based on wireless LAN is being studied because utilization on smart phone using Wi-Fi is increased. 802.11 b/g/a is universalized wireless LAN technologies based on ISM, the standard developed in 11`s working group of IEEE 802. standardization about IEEE 802.11ac that overcame limitation on Blue-ray of IEEE 802.11n or uncompressed video transmission and IEEE 802.af`s technologies using TVWS is being actively studied. In this paper, ability of transmission considering the security on AP operated by these technologies have measured and done a comparative analysis with existing wireless LAN environment ability of transmission measured when appling security is more stable than existing ability of transmission in an environment with obstacles and shorten of transmission time is confirmed as a result of analysis.

A New WiMAX/Wi-Fi Interoperability Model and Its Performance Evaluation

In this paper, a new interoperability model for deployment of the emerging IEEE 802.16; WiMAX (World Wide Interoperability for Microwave Access) and a Wi-Fi (Wireless Fidelity), IEEE 802.11 based on Wireless LAN technology in a complementary way as a path to migration towards the upcoming fourth generation, is presented. The model allows for the integration of the two technologies, combining the benefits of both worlds for Non line-of-sight environments. The suggested scenario is to have a hotspot Wi-Fi or urban cell surrounded by a set of WiMAX (suburban) cells where users can have continuous connectivity in different propagation environments. If the C/I (Carrier-to-Interference) of a user is higher than a given threshold (say C/I $$>$$ G) then the user connects to the Wi-Fi cell otherwise the user is admitted to a WiMAX cell. In both cases, the user will have the best of the available access technology with an acceptable level of grade-of-service, i.e. $$<$$ 2 %, on move. The suggested model includes mixed services support i.e. voice, data and video with mobility, as well as scalability based on scalable orthogonal frequency division multiplexing adaptive bandwidth allocation. The scalability is applied on data connection, where ongoing data connection is asked to modify its transmission rate for the sake of handover calls. Numerical results from the evaluation of the interoperability model are given. The curves for average data rate, utilization, blocking probability, handover blocking probability, grade of service, and throughput demonstrate the effectiveness of the new deployment model.

Low-Complexity Class-Based Scheduling Algorithm for Scheduled Automatic Power-Save Delivery for Wireless LANs

Power saving is an important issue when integrating the wireless LAN technology into mobile devices. Besides Quality of Service (QoS) guarantee, the IEEE 802.11e introduces an architecture called Scheduled Automatic Power-Save Delivery (S-APSD) aiming at delivering buffered frames to power save stations. In S-APSD, the Access Point (AP) schedules the Service Period (SP) of stations. To increase power efficiency, SPs should be scheduled to minimize the chance of overlapping. In a recent paper, an algorithm named Overlapping Aware S-APSD (OAS-APSD) was proposed to find the wake-up time schedule for a new Traffic Stream (TS) to minimize the chance of SP overlapping. The combination of OAS-APSD and HCF Controlled Channel Access (HCCA) was proved to outperform 802.11 Power Save Mode (PSM) with Enhanced Distributed Channel Access (EDCA) in power saving efficiency and QoS support. However, the OAS-APSD algorithm requires high online computational complexity which could make it infeasible for real systems. Without harming the optimality, this paper presents an efficient algorithm with much less complexity by exploiting the periodicity of service schedule. Because of largely reduced online computational complexity, the proposed algorithm is much more feasible than OAS-APSD.