The Experts below are selected from a list of 2316 Experts worldwide ranked by ideXlab platform
Mingjun Xiao - One of the best experts on this subject based on the ideXlab platform.
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MASS - An Efficient Implementation of File Sharing Systems on the Basis of WiMAX and Wi-Fi
2006 IEEE International Conference on Mobile Ad Hoc and Sensor Sysetems, 2006Co-Authors: Liusheng Huang, Weijia Jia, Mingjun XiaoAbstract:This paper proposes an efficient algorithm for P2P file sharing systems based on WiMAX mesh mode and Wi-Fi technologies. Wireless networks in our system are hierarchically divided into three layers: Wi-Fi based wireless local area networks under a Subscriber Station; the mesh network of Subscriber Stations under a base Station; the network of base Stations. File lookup procedure may go through three steps: the requesting end host firstly looks up for the requested file within it's neighbor end hosts under the same subscribe Station; if fails, then it sends lookup messages to the nearest Subscriber Stations in the mesh network following to a changed dynamic source routing protocol; if both the steps fail, then the requesting end host searches the requested file through the Chord-based base Stations' overlay. By statistical analysis and simulations, we prove that our layered P2P file sharing system can reduce the number of lookup messages in physical networks and prevent over expenses of precious bandwidth in wireless metropolitan area networks.
Weijia Jia - One of the best experts on this subject based on the ideXlab platform.
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HPCC - N-Module Based Self-Adaptive Contention Resolution Scheme for WiMAX P2MP Network
2008 10th IEEE International Conference on High Performance Computing and Communications, 2008Co-Authors: Zhiqiang Wang, Weijia JiaAbstract:Currently, the truncated binary exponential backoff based scheme had been defined as the mandatory contention resolution scheme in WiMAX standards. However, it had been discussed in many research that these schemes can not work perfectly with WiMAX in most cases. In this paper, a novel N modules based self-adaptive contention resolution scheme has been proposed, which divides all Subscriber Stations into several groups according to the number of available transmission opportunities in each frame and requires each Subscriber Station send bandwidth request during its group time. Meanwhile, the number of available transmission opportunities will be self-adaptively updated by Base Station according to the average collision probability presented in last frame. The analysis and simulation results show our scheme can improve the performance of whole network remarkably.
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MASS - An Efficient Implementation of File Sharing Systems on the Basis of WiMAX and Wi-Fi
2006 IEEE International Conference on Mobile Ad Hoc and Sensor Sysetems, 2006Co-Authors: Liusheng Huang, Weijia Jia, Mingjun XiaoAbstract:This paper proposes an efficient algorithm for P2P file sharing systems based on WiMAX mesh mode and Wi-Fi technologies. Wireless networks in our system are hierarchically divided into three layers: Wi-Fi based wireless local area networks under a Subscriber Station; the mesh network of Subscriber Stations under a base Station; the network of base Stations. File lookup procedure may go through three steps: the requesting end host firstly looks up for the requested file within it's neighbor end hosts under the same subscribe Station; if fails, then it sends lookup messages to the nearest Subscriber Stations in the mesh network following to a changed dynamic source routing protocol; if both the steps fail, then the requesting end host searches the requested file through the Chord-based base Stations' overlay. By statistical analysis and simulations, we prove that our layered P2P file sharing system can reduce the number of lookup messages in physical networks and prevent over expenses of precious bandwidth in wireless metropolitan area networks.
Debabrata Das - One of the best experts on this subject based on the ideXlab platform.
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A novel architecture for IEEE 802.16m Subscriber Station for joint power saving class management
2009 First International Communication Systems and Networks and Workshops, 2009Co-Authors: Ritesh Kumar Kalle, Mayank Raj, Debabrata DasAbstract:IEEE 802.16m amendment is being drafted to meet the 4G network requirements as an extension to 802.16e-2005. In 802.16e, a Subscriber Station (SS) can have multiple connections to a Base Station (BS) for supporting different services simultaneously. SS negotiates sleep-mode with BS by exchange of management information for one or more connections per active Power Saving Class Identifier (PSC_ID) belonging to a Power Saving Class (PSC). However, after this negotiation, SS may not be able to switch to actual sleep-mode (low power operation) as connections belonging to other PSC_ID may be in the transmission or reception mode. Moreover, this causes an overhead of management messages exchanged between the SS and BS per PSC_ID that results in excess packet delay as well as wastage of power and bandwidth. In this paper, we propose a novel architecture referred as Sleep-Mode Manager Architecture to negotiate the sleep mode for the SS and to compute the sleep-mode per quality of service (QoS) class by aggregating the unavailability periods of all the active PSC_ID traffic. This architecture reduces the overhead of management messages, thereby conserving bandwidth and energy as well as supporting dynamic adaptation in sleep-mode parameters. Our simulation and analysis results reveal that the proposed architecture performs substantially better than the 802.16e standard and the relative performance improves with increasing number of active PSC_IDs which can be implemented in 802.16m. Furthermore, through analysis we find that the efficiency of device switching to sleep-mode improves from 7.1% in case of single PSC_ID to 35% in case of joint power class management for ten simultaneous connections. Simulation reveals that, the management message exchange overhead in case of proposed joint power saving class reduces to 1/5th of that in case of individual PSC_ID management in case of four simultaneous PSC_IDs.
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adaptive power saving algorithm for mobile Subscriber Station in 802 16e
COMmunication System softWAre and MiddlewaRE, 2007Co-Authors: Omanand Jha Vatsa, Mayank Raj, Deepak Panigrahy, Ritesh K Kumar, Debabrata DasAbstract:WiMAX standard for mobility (IEEE 802.16e) addresses the issues related to energy conservation at Mobile Subscriber Station (MSS) in sleep mode. In 802.16e the sleep mode is exponentially distributed according to traffic, The algorithm that deals with sleep mode energy consumption in 802.16e network does not address the problem of varying traffic rates. This paper proposes an adaptive sleep mode interval control algorithm for 802.16e, which takes into account the downlink traffic pattern to minimize energy consumption. Moreover, we characterize the standardized sleep mode in IEEE 802.16e MSS taking into account various situation like, moving into sleep, listening or wake-up modes. It has been observed that our proposed algorithm for sleep mode saves substantial amount of energy at lower traffic and almost same at higher traffic as compared to 802.16e. The results reveal that the optimization of sleep mode leads to decrease in average waiting time delay at MSS. Furthermore, our analytical evaluations are close to simulation results.
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COMSWARE - Adaptive Power Saving Algorithm for Mobile Subscriber Station in 802.16e
2007 2nd International Conference on Communication Systems Software and Middleware, 2007Co-Authors: Omanand Jha Vatsa, Mayank Raj, K. Ritesh Kumar, Deepak Panigrahy, Debabrata DasAbstract:WiMAX standard for mobility (IEEE 802.16e) addresses the issues related to energy conservation at Mobile Subscriber Station (MSS) in sleep mode. In 802.16e the sleep mode is exponentially distributed according to traffic, The algorithm that deals with sleep mode energy consumption in 802.16e network does not address the problem of varying traffic rates. This paper proposes an adaptive sleep mode interval control algorithm for 802.16e, which takes into account the downlink traffic pattern to minimize energy consumption. Moreover, we characterize the standardized sleep mode in IEEE 802.16e MSS taking into account various situation like, moving into sleep, listening or wake-up modes. It has been observed that our proposed algorithm for sleep mode saves substantial amount of energy at lower traffic and almost same at higher traffic as compared to 802.16e. The results reveal that the optimization of sleep mode leads to decrease in average waiting time delay at MSS. Furthermore, our analytical evaluations are close to simulation results.
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NSDR - Providing voice connectivity to rural India using WiMAX: issues and solution
Proceedings of the 2007 workshop on Networked systems for developing regions - NSDR '07, 2007Co-Authors: Abhijit Lele, Mayank Raj, Debabrata DasAbstract:The need of emerging markets telecom, specifically in the Indian telecom scenario, WiMAX is being looked as a broadband access solution ahead of LTE and other competing technologies due its long range and high bandwidth. Voice Over IP (VoIP) will potentially be the killer application for emerging market like India. In this paper we propose a Kiosk based WiMAX infrastructure model to provide voice connectivity to rural Indian villages. In the proposed kiosk model, plain old telephones are connected to a WiMAX Subscriber Station using Foreign Exchange Subscriber and a Media Gateway. The novelty of the kiosk based infrastructure models is that it has low deployment cost from a service provider perspective, and almost negligible equipment cost for the end user. In order to make the kiosk based model economically sustainable, the number of simultaneous voice calls that can be supported over the WiMAX Subscriber Stations needs to be maximized. To this end, the paper proposes a Dynamic Frame Profile algorithm to maximize the number of VoIP calls supported over a single Subscriber Station. A performance evaluation of the the proposed Dynamic Frame Profile algorithm is also carried out to study its effectiveness and reported in this paper.
Chen Liu - One of the best experts on this subject based on the ideXlab platform.
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Efficient scheduling algorithm for multiple mobile Subscriber Stations with unsolicited grant service in an IEEE 802.16e network
Journal of Network and Computer Applications, 2016Co-Authors: Wen-hwa Liao, Ssu-chi Kuai, Chen LiuAbstract:The IEEE 802.16e standard introduces the concept of mobile Subscriber Stations (MSSs) to provide mobility support. Five quality of service (QoS) classes have been defined to meet the QoS requirement of different connections between a base Station and a Subscriber Station. Among these QoS classes, unsolicited grant service (UGS) has been designed to support real-time service flows that periodically generate fixed-size data packets. Most of the existing scheduling schemes for a UGS class consider scheduling only a single MSS; even if such schemes consider multiple MSSs, the QoS requirement of such MSSs is not appropriately satisfied after scheduling. This paper proposes a scheduling scheme, which schedules multiple MSSs with UGS connections so that the QoS requirement of each MSS can be satisfied after scheduling. The simulation results showed that the proposed approach achieved a bandwidth utilization of more than 90% and did not incur a high bandwidth waste when the number of connections was high.
Roopsingh Takur - One of the best experts on this subject based on the ideXlab platform.
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Improving Quality of Vehicle Tracking Systems in Hill Stations Using IEEE 802.16 Networks
TIJ's Research Journal of Science & IT Management - RJSITM, 2013Co-Authors: Roopsingh TakurAbstract:IEEE 802.16 standard was designed to support the vehicle tracking system applications with quality of service(QOS). Tracking system is used for tracking the vehicles in hill Stations with quality of service(QOS). With the help of Subscriber Station(SS) can track the vehicles. Subscriber Station’s will provide signals to the mobiles and vehicles .In this paper, we propose a scheme, named vehicle tracking system, to track the vehicles without any interrupt in hill Stations with quality of service(QOS). The idea of the proposed scheme is to track the vehicles in the roads of the hill Stations which is coming in opposite direction and back of the vehicle. Analysis and simulations are used to evaluate the proposed scheme. Simulation and analysis results confirm that the proposed can track the vehicles with the help of Subscriber Station by given quality of service(QOS). Scheduling algorithms are proposed to improve the overall throughput. The simulation results show that our proposed algorithm improves the overall throughput by 40% in a steady network.
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Improving Quality of Vehicle Tracking Systems in Hill Stations Using IEEE 802.16 Networks
International Journal of Electrical and Computer Engineering (IJECE), 2012Co-Authors: Roopsingh Takur, E. RamkumarAbstract:IEEE 802.16 standard was designed to support the vehicle tracking system applications with quality of service(QOS). Tracking system is used for tracking the vehicles in hill Stations with quality of service(QOS). With the help of Subscriber Station(SS) can track the vehicles. Subscriber Station’s will provide signals to the mobiles and vehicles .In this paper, we propose a scheme, named vehicle tracking system, to track the vehicles without any interrupt in hill Stations with quality of service(QOS). The idea of the proposed scheme is to track the vehicles in the roads of the hill Stations which is coming in opposite direction and back of the vehicle. Analysis and simulations are used to evaluate the proposed scheme. Simulation and analysis results confirm that the proposed can track the vehicles with the help of Subscriber Station by given quality of service(QOS). Scheduling algorithms are proposed to improve the overall throughput. The simulation results show that our proposed algorithm improves the overall throughput by 40% in a steady network. DOI: http://dx.doi.org/10.11591/ijece.v3i1.2131
