Pub Date : 2011-12-08DOI: 10.1109/ATNAC.2011.6096630
Kwan-Wu Chin
In light of worldwide concerns regarding the emission of green house gases, researchers have begun to look at ways to reduce the carbon footprint of Information Technology (IT) infrastructure. This paper contributes to this effort by proposing a scheduler that switches off unnecessary Access Points (APs), up to 88% of deployed APs, while ensuring end-users continue to enjoy good coverage and performance.
{"title":"A green scheduler for enterprise WLANs","authors":"Kwan-Wu Chin","doi":"10.1109/ATNAC.2011.6096630","DOIUrl":"https://doi.org/10.1109/ATNAC.2011.6096630","url":null,"abstract":"In light of worldwide concerns regarding the emission of green house gases, researchers have begun to look at ways to reduce the carbon footprint of Information Technology (IT) infrastructure. This paper contributes to this effort by proposing a scheduler that switches off unnecessary Access Points (APs), up to 88% of deployed APs, while ensuring end-users continue to enjoy good coverage and performance.","PeriodicalId":210916,"journal":{"name":"2011 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132546242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-08DOI: 10.1109/ATNAC.2011.6096674
K. Imran, T. Jensen
Presence service is one of the most important IP Multimedia Subsystem (IMS) services which allow the user to express their availability and willingness to communicate with each other. Several studies have shown that Call Session Control Function (CSCF) may become the bottleneck in the IMS network, but when a crucial IMS service presence service (PS) is combined with the web services (WS), the number of bottlenecks may change or may shift to some other node. In this paper, simulation results have been presented which shows that when PS and WS are combined together then AS and WS may become the performance bottlenecks. The simulation results are then analyzed and compared with the theoretical analysis and they show a good agreement with it. A solution to improve the performance and to eliminate the bottlenecks has been suggested through this paper.
在线服务是IP多媒体子系统(IMS)中最重要的业务之一，它允许用户表达自己的可用性和相互通信的意愿。一些研究表明，呼叫会话控制功能(Call Session Control Function, CSCF)可能成为IMS网络中的瓶颈，但是当关键的IMS服务存在服务(PS)与web服务(WS)结合时，瓶颈的数量可能发生变化或转移到其他节点。本文给出的仿真结果表明，当PS和WS结合使用时，AS和WS可能成为性能瓶颈。将仿真结果与理论分析结果进行了比较，结果与理论分析结果吻合较好。本文提出了一种提高性能和消除瓶颈的解决方案。
{"title":"Bottlenecks elimination and performance enhancements in IMS presence service","authors":"K. Imran, T. Jensen","doi":"10.1109/ATNAC.2011.6096674","DOIUrl":"https://doi.org/10.1109/ATNAC.2011.6096674","url":null,"abstract":"Presence service is one of the most important IP Multimedia Subsystem (IMS) services which allow the user to express their availability and willingness to communicate with each other. Several studies have shown that Call Session Control Function (CSCF) may become the bottleneck in the IMS network, but when a crucial IMS service presence service (PS) is combined with the web services (WS), the number of bottlenecks may change or may shift to some other node. In this paper, simulation results have been presented which shows that when PS and WS are combined together then AS and WS may become the performance bottlenecks. The simulation results are then analyzed and compared with the theoretical analysis and they show a good agreement with it. A solution to improve the performance and to eliminate the bottlenecks has been suggested through this paper.","PeriodicalId":210916,"journal":{"name":"2011 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132712808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-08DOI: 10.1109/ATNAC.2011.6096666
C. Do, A. Tran, D. Hewitt
In this paper, we present a chromatic dispersion (CD) estimation technique based on complementary Golay sequences for systems employing single-carrier with frequency domain equalization (SC-FDE) format. By exploiting the unique correlation property of Golay sequences and using the sequences as channel estimation symbol (CES), chromatic dispersion can be estimated by measuring partial phase response and compensated using frequency domain equalization (FDE) with relatively low complexity in both the training sequences and estimation algorithm. The technique is verified by computer simulation to be able to estimate and compensate for up to 1500 km fiber with standard dispersion at high accuracy in 80 Gb/s coherent NRZ-QPSK system.
{"title":"Chromatic dispersion estimation based on complementary Golay sequences for 80 Gb/s QPSK single-carrier system with frequency domain equalization","authors":"C. Do, A. Tran, D. Hewitt","doi":"10.1109/ATNAC.2011.6096666","DOIUrl":"https://doi.org/10.1109/ATNAC.2011.6096666","url":null,"abstract":"In this paper, we present a chromatic dispersion (CD) estimation technique based on complementary Golay sequences for systems employing single-carrier with frequency domain equalization (SC-FDE) format. By exploiting the unique correlation property of Golay sequences and using the sequences as channel estimation symbol (CES), chromatic dispersion can be estimated by measuring partial phase response and compensated using frequency domain equalization (FDE) with relatively low complexity in both the training sequences and estimation algorithm. The technique is verified by computer simulation to be able to estimate and compensate for up to 1500 km fiber with standard dispersion at high accuracy in 80 Gb/s coherent NRZ-QPSK system.","PeriodicalId":210916,"journal":{"name":"2011 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114483467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-08DOI: 10.1109/ATNAC.2011.6096664
F. M. Rahman, M. Gregory
Mobile Ad hoc Networks (MANET) use a communication technique that can transmit data between nodes without the support of fixed infrastructure. MANET is a multi-hop, self configuring and autonomous network that can use intermediate mobile nodes as a router and transmit data between mobile devices. A quadrant based intelligent energy controlled multicast algorithm for MANET identified during earlier research is the basis for the algorithm presented in this paper. Simulation results and comparison with other MANET routing algorithms highlighted that the algorithm is energy efficient and reliable but relatively slow for data transmission. An improved MANET routing algorithm is proposed in this paper which eliminates the data transmission delay limitation and increases the number of delivered packets. The new algorithm is called 4-N Intelligent Routing Algorithm as it selects a subset of 4 intermediate nodes located in the direction of the destination node and uses an intelligent energy matrix to distribute the load among the subset of nodes. Simulations were carried out of the proposed MANET algorithm using Opnet Modeler v16. Comparison with other MANET routing algorithms showed that the proposed algorithm successfully delivers more packets, reduces end to end delay and utilizes comparable energy for data transmission.
{"title":"4-N intelligent MANET routing algorithm","authors":"F. M. Rahman, M. Gregory","doi":"10.1109/ATNAC.2011.6096664","DOIUrl":"https://doi.org/10.1109/ATNAC.2011.6096664","url":null,"abstract":"Mobile Ad hoc Networks (MANET) use a communication technique that can transmit data between nodes without the support of fixed infrastructure. MANET is a multi-hop, self configuring and autonomous network that can use intermediate mobile nodes as a router and transmit data between mobile devices. A quadrant based intelligent energy controlled multicast algorithm for MANET identified during earlier research is the basis for the algorithm presented in this paper. Simulation results and comparison with other MANET routing algorithms highlighted that the algorithm is energy efficient and reliable but relatively slow for data transmission. An improved MANET routing algorithm is proposed in this paper which eliminates the data transmission delay limitation and increases the number of delivered packets. The new algorithm is called 4-N Intelligent Routing Algorithm as it selects a subset of 4 intermediate nodes located in the direction of the destination node and uses an intelligent energy matrix to distribute the load among the subset of nodes. Simulations were carried out of the proposed MANET algorithm using Opnet Modeler v16. Comparison with other MANET routing algorithms showed that the proposed algorithm successfully delivers more packets, reduces end to end delay and utilizes comparable energy for data transmission.","PeriodicalId":210916,"journal":{"name":"2011 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124982913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-08DOI: 10.1109/ATNAC.2011.6096670
S. B. Pourpeighambar, Mehdi Aminian, M. Sabaei
In Wireless Sensor Networks (WSNs), sensor nodes power consumption is main challenge. Emerging in-network aggregation techniques are increasingly being sought to overcome this constraint and to save precious energy. In our previously proposed method, entitled “Data Aggregation for Mobile Object Using Rate-Distortion” (DAMORD), we introduced a mathematical model for data aggregation for the moving object and exploited spatial correlation in sensed data. However, due to the complex computation arising from movement of the object, a more practical version of the original algorithm, DAMORD-SC, is presented here which significantly reduces the computation overhead using Static Clustering (SC) mechanism. In this innovative approach, predefined clusters are split into grids and pre-calculated correlation matrices are used to perform data aggregation. With the new mechanism to assess the accuracy of the method, proper grid size for clusters is obtained under different conditions with consideration to energy consumption and data accuracy. Detailed energy consumption measurements are made using the precise energy model for communication operation as well as sim-Panalyser for computation energy. Simulation results in NS-2 demonstrate that this enhanced scheme achieves substantial energy saving under a high correlation setup within the user-defined distortion rate.
{"title":"Energy efficient data aggregation of moving object in Wireless Sensor Networks","authors":"S. B. Pourpeighambar, Mehdi Aminian, M. Sabaei","doi":"10.1109/ATNAC.2011.6096670","DOIUrl":"https://doi.org/10.1109/ATNAC.2011.6096670","url":null,"abstract":"In Wireless Sensor Networks (WSNs), sensor nodes power consumption is main challenge. Emerging in-network aggregation techniques are increasingly being sought to overcome this constraint and to save precious energy. In our previously proposed method, entitled “Data Aggregation for Mobile Object Using Rate-Distortion” (DAMORD), we introduced a mathematical model for data aggregation for the moving object and exploited spatial correlation in sensed data. However, due to the complex computation arising from movement of the object, a more practical version of the original algorithm, DAMORD-SC, is presented here which significantly reduces the computation overhead using Static Clustering (SC) mechanism. In this innovative approach, predefined clusters are split into grids and pre-calculated correlation matrices are used to perform data aggregation. With the new mechanism to assess the accuracy of the method, proper grid size for clusters is obtained under different conditions with consideration to energy consumption and data accuracy. Detailed energy consumption measurements are made using the precise energy model for communication operation as well as sim-Panalyser for computation energy. Simulation results in NS-2 demonstrate that this enhanced scheme achieves substantial energy saving under a high correlation setup within the user-defined distortion rate.","PeriodicalId":210916,"journal":{"name":"2011 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122096887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-08DOI: 10.1109/ATNAC.2011.6096650
S. Parakh, A. Jagannatham
In this paper, we present a novel scheme for optimal OFDMA subcarrier allocation towards video quality maximization employing the paradigm of H.264 based scalable video coding (SVC). We deduce the rate and quality model parameters for video characterization of the SVC extension of the H.264/AVC and propose an optimization framework for sum quality maximization of the transmitted video streams in unicast and multicast 4G scenarios. We derive the closed form solution for optimal quantizer selection towards net video quality maximization subject to rate constraints of the unicast/ multicast users, taking into account the different modulation and coding rates of the multicast groups in the 4G wireless system. This in turn yields the optimal OFDMA time/frequency resource allocation for video multiplexing. In the simulation results section, we specialize our proposed algorithm in the context of WiMAX based 4G video transmission and demonstrate that our algorithm provides significant improvement in video quality over the content agnostic non-scalable equal symbol rate allocation scheme for unicast and multicast scenarios.
{"title":"Optimal subcarrier allocation for H.264 based scalable video transmission in 4G OFDMA systems","authors":"S. Parakh, A. Jagannatham","doi":"10.1109/ATNAC.2011.6096650","DOIUrl":"https://doi.org/10.1109/ATNAC.2011.6096650","url":null,"abstract":"In this paper, we present a novel scheme for optimal OFDMA subcarrier allocation towards video quality maximization employing the paradigm of H.264 based scalable video coding (SVC). We deduce the rate and quality model parameters for video characterization of the SVC extension of the H.264/AVC and propose an optimization framework for sum quality maximization of the transmitted video streams in unicast and multicast 4G scenarios. We derive the closed form solution for optimal quantizer selection towards net video quality maximization subject to rate constraints of the unicast/ multicast users, taking into account the different modulation and coding rates of the multicast groups in the 4G wireless system. This in turn yields the optimal OFDMA time/frequency resource allocation for video multiplexing. In the simulation results section, we specialize our proposed algorithm in the context of WiMAX based 4G video transmission and demonstrate that our algorithm provides significant improvement in video quality over the content agnostic non-scalable equal symbol rate allocation scheme for unicast and multicast scenarios.","PeriodicalId":210916,"journal":{"name":"2011 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127674334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-08DOI: 10.1109/ATNAC.2011.6096637
F. Juraschek, M. Günes, Matthias Philipp, B. Blywis, O. Hahm
In this paper we present the DES-Chan framework for experimentally-driven research on distributed channel assignment algorithms in wireless mesh networks. The implementation process of channel assignment algorithms is a difficult task for the researcher since common operating systems do not support channel assignment algorithms out of the box. DES-Chan provides a set of common services required by distributed channel assignment algorithms. The modular architecture of DES-Chan allows the extensions with further modules or the modifications of existing ones. As a proof of concept, we present a reference implementation of a distributed greedy channel assignment algorithm. We evaluate its performance in the DES-Testbed, a multi-transceiver wireless mesh network (WMN) with 100 nodes at the Freie Universität Berlin.
本文提出了DES-Chan框架，用于无线网状网络中分布式信道分配算法的实验研究。信道分配算法的实现过程对研究者来说是一个困难的任务，因为常见的操作系统不支持开箱的信道分配算法。DES-Chan提供了分布式信道分配算法所需的一组公共服务。DES-Chan的模块化架构允许扩展更多的模块或修改现有的模块。作为概念证明，我们提出了一个分布式贪婪信道分配算法的参考实现。我们在des测试台上评估了它的性能，des测试台上是一个多收发器无线网状网络(WMN)，在Freie Universität Berlin有100个节点。
{"title":"DES-Chan: A framework for distributed channel assignment in wireless mesh networks","authors":"F. Juraschek, M. Günes, Matthias Philipp, B. Blywis, O. Hahm","doi":"10.1109/ATNAC.2011.6096637","DOIUrl":"https://doi.org/10.1109/ATNAC.2011.6096637","url":null,"abstract":"In this paper we present the DES-Chan framework for experimentally-driven research on distributed channel assignment algorithms in wireless mesh networks. The implementation process of channel assignment algorithms is a difficult task for the researcher since common operating systems do not support channel assignment algorithms out of the box. DES-Chan provides a set of common services required by distributed channel assignment algorithms. The modular architecture of DES-Chan allows the extensions with further modules or the modifications of existing ones. As a proof of concept, we present a reference implementation of a distributed greedy channel assignment algorithm. We evaluate its performance in the DES-Testbed, a multi-transceiver wireless mesh network (WMN) with 100 nodes at the Freie Universität Berlin.","PeriodicalId":210916,"journal":{"name":"2011 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130350488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/atnac.2011.6096627
M. Gregory, M. Gunes, Matthias Philipp, B. Blywis, Marcus Frean, S. Parakh, A. Jamalipour, A. Jagannatham, S. Rajasegarar, Richard Nelson, T. Moazzeni, N. Beaulieu, H. Sirisena, S. Freear
9:30 – 10.30 Am – Keynote Speech (Prof. Ben Gavish) Session I : Green Computing 10:30 – 11:30 1 A Green Scheduler for Enterprise WLANS Kwan-Wu Chin 2 A Green and Secure Authentication for the 4 th Generation Mobile Network Lili GU, Mark A Gregory 3 Green MPLS Traffic Engineering Hon-Wai Chu, Chi-Chung Cheung, Kin-Hon Ho, and Ning Wang Session II : Ad Hoc Networks , 10:30 – 12:30 1 The Performance of Blacklisting in Ad Hoc Networks with Unidirectional Links Sankissa G Jayasinghe
9:30 - 10.30 Am -主题演讲(Ben Gavish教授)会话我:绿色计算10:30 - 11:30 1绿色调度程序为企业无线局域网Kwan-Wu下巴2的绿色和安全认证4 th代移动网络丽丽顾,马克格雷戈里3绿色MPLS流量工程Hon-Wai楚,脊中张,Kin-Hon Ho和宁王会话II:特设网络,10:30 - 12:30 1的性能在Ad Hoc网络黑名单Sankissa G Jayasinghe单向链接
{"title":"Conference program final","authors":"M. Gregory, M. Gunes, Matthias Philipp, B. Blywis, Marcus Frean, S. Parakh, A. Jamalipour, A. Jagannatham, S. Rajasegarar, Richard Nelson, T. Moazzeni, N. Beaulieu, H. Sirisena, S. Freear","doi":"10.1109/atnac.2011.6096627","DOIUrl":"https://doi.org/10.1109/atnac.2011.6096627","url":null,"abstract":"9:30 – 10.30 Am – Keynote Speech (Prof. Ben Gavish) Session I : Green Computing 10:30 – 11:30 1 A Green Scheduler for Enterprise WLANS Kwan-Wu Chin 2 A Green and Secure Authentication for the 4 th Generation Mobile Network Lili GU, Mark A Gregory 3 Green MPLS Traffic Engineering Hon-Wai Chu, Chi-Chung Cheung, Kin-Hon Ho, and Ning Wang Session II : Ad Hoc Networks , 10:30 – 12:30 1 The Performance of Blacklisting in Ad Hoc Networks with Unidirectional Links Sankissa G Jayasinghe","PeriodicalId":210916,"journal":{"name":"2011 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128653556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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