2015
A.G. Sarigiannidis; P. Nicopolitidis; G.I. Papadimitriou; P.G. Sarigiannidis; M.D. Louta; A.S. Pomportsis
On the use of learning automata in tuning the channel split ratio of WiMAX networks Journal Article
In: IEEE Systems Journal, vol. 9, no. 3, pp. 651-663, 2015.
Περίληψη | BibTeX | Ετικέτες: IEEE 802.16, learning automata (LA), mapping, orthogonal frequency-division multiple access (OFDMA), Worldwide Interoperability for Microwave Access (WiMAX) | Σύνδεσμοι:
@article{Sarigiannidis2015651,
title = {On the use of learning automata in tuning the channel split ratio of WiMAX networks},
author = { A.G. Sarigiannidis and P. Nicopolitidis and G.I. Papadimitriou and P.G. Sarigiannidis and M.D. Louta and A.S. Pomportsis},
url = {https://www.researchgate.net/publication/259965818_On_the_Use_of_Learning_Automata_in_Tuning_the_Channel_Split_Ratio_of_WiMAX_Networks?_sg=n136X9gc9StHToProYGXLZS-jwpMWkwXOcutOZjrnuvav1Dkx2j8jDAYH2U1EttqBO-qyvaiEoSFzSk},
doi = {10.1109/JSYST.2013.2282032},
year = {2015},
date = {2015-01-01},
journal = {IEEE Systems Journal},
volume = {9},
number = {3},
pages = {651-663},
abstract = {The Worldwide Interoperability for Microwave Access (WiMAX) family of standards have introduced a flexible, efficient, and robust wireless interface. Among other interesting features, WiMAX access networks bring into play a flexible determination of the ratio between the downlink and uplink directions, allowing a relation width from 3: 1 to 1: 1, respectively. However, this promising feature is not properly utilized, since hitherto scheduling and mapping schemes proposed neglect it. In this paper, this challenging issue is effectively addressed by proposing an adaptive model that attempts to adequately adjust the downlink-to-uplink subframe width ratio according to the current traffic conditions. In the context of a mobile WiMAX wireless access network, the base station is enhanced with an error-aware learning automaton in order to be able to identify the magnitude of the incoming and outgoing traffic flows and, in turn, to suitably define the ratio on a frame-by-frame basis. The model designed is extensively evaluated under realistic and dynamic scenarios, and the results indicate that its performance is clearly improved compared with schemes having predefined and fixed ratio values. © 2007-2012 IEEE.},
keywords = {IEEE 802.16, learning automata (LA), mapping, orthogonal frequency-division multiple access (OFDMA), Worldwide Interoperability for Microwave Access (WiMAX)},
pubstate = {published},
tppubtype = {article}
}
The Worldwide Interoperability for Microwave Access (WiMAX) family of standards have introduced a flexible, efficient, and robust wireless interface. Among other interesting features, WiMAX access networks bring into play a flexible determination of the ratio between the downlink and uplink directions, allowing a relation width from 3: 1 to 1: 1, respectively. However, this promising feature is not properly utilized, since hitherto scheduling and mapping schemes proposed neglect it. In this paper, this challenging issue is effectively addressed by proposing an adaptive model that attempts to adequately adjust the downlink-to-uplink subframe width ratio according to the current traffic conditions. In the context of a mobile WiMAX wireless access network, the base station is enhanced with an error-aware learning automaton in order to be able to identify the magnitude of the incoming and outgoing traffic flows and, in turn, to suitably define the ratio on a frame-by-frame basis. The model designed is extensively evaluated under realistic and dynamic scenarios, and the results indicate that its performance is clearly improved compared with schemes having predefined and fixed ratio values. © 2007-2012 IEEE.
2014
M. Louta; P. Sarigiannidis; S. Misra; P. Nicopolitidis; G. Papadimitriou
RLAM: A dynamic and efficient reinforcement learning-based adaptive mapping scheme in mobile WiMAX networks Journal Article
In: Mobile Information Systems, vol. 10, no. 2, pp. 173-196, 2014.
Περίληψη | BibTeX | Ετικέτες: channel allocation ratio, IEEE 802.16, Learning, mapping, OFDMA, WiMAX | Σύνδεσμοι:
@article{Louta2014173,
title = {RLAM: A dynamic and efficient reinforcement learning-based adaptive mapping scheme in mobile WiMAX networks},
author = { M. Louta and P. Sarigiannidis and S. Misra and P. Nicopolitidis and G. Papadimitriou},
url = {https://www.researchgate.net/publication/259965632_RLAM_A_Dynamic_and_Efficient_Reinforcement_Learning-based_Adaptive_Mapping_Scheme_in_Mobile_WiMAX_Networks},
doi = {10.3233/MIS-130177},
year = {2014},
date = {2014-01-01},
journal = {Mobile Information Systems},
volume = {10},
number = {2},
pages = {173-196},
abstract = {WiMAX (Worldwide Interoperability for Microwave Access) constitutes a candidate networking technology towards the 4G vision realization. By adopting the Orthogonal Frequency Division Multiple Access (OFDMA) technique, the latest IEEE 802.16x amendments manage to provide QoS-aware access services with full mobility support. A number of interesting scheduling and mapping schemes have been proposed in research literature. However, they neglect a considerable asset of the OFDMA-based wireless systems: the dynamic adjustment of the downlink-to-uplink width ratio. In order to fully exploit the supported mobile WiMAX features, we design, develop, and evaluate a rigorous adaptive model, which inherits its main aspects from the reinforcement learning field. The model proposed endeavours to efficiently determine the downlink-to-uplink width ratio, on a frame-by-frame basis, taking into account both the downlink and uplink traffic in the Base Station (BS). Extensive evaluation results indicate that the model proposed succeeds in providing quite accurate estimations, keeping the average error rate below 15% with respect to the optimal sub-frame configurations. Additionally, it presents improved performance compared to other learning methods (e.g., learning automata) and notable improvements compared to static schemes that maintain a fixed predefined ratio in terms of service ratio and resource utilization. © 2014-IOS Press.},
keywords = {channel allocation ratio, IEEE 802.16, Learning, mapping, OFDMA, WiMAX},
pubstate = {published},
tppubtype = {article}
}
WiMAX (Worldwide Interoperability for Microwave Access) constitutes a candidate networking technology towards the 4G vision realization. By adopting the Orthogonal Frequency Division Multiple Access (OFDMA) technique, the latest IEEE 802.16x amendments manage to provide QoS-aware access services with full mobility support. A number of interesting scheduling and mapping schemes have been proposed in research literature. However, they neglect a considerable asset of the OFDMA-based wireless systems: the dynamic adjustment of the downlink-to-uplink width ratio. In order to fully exploit the supported mobile WiMAX features, we design, develop, and evaluate a rigorous adaptive model, which inherits its main aspects from the reinforcement learning field. The model proposed endeavours to efficiently determine the downlink-to-uplink width ratio, on a frame-by-frame basis, taking into account both the downlink and uplink traffic in the Base Station (BS). Extensive evaluation results indicate that the model proposed succeeds in providing quite accurate estimations, keeping the average error rate below 15% with respect to the optimal sub-frame configurations. Additionally, it presents improved performance compared to other learning methods (e.g., learning automata) and notable improvements compared to static schemes that maintain a fixed predefined ratio in terms of service ratio and resource utilization. © 2014-IOS Press.
T.D. Lagkas; P. Sarigiannidis; M. Louta
Analyzing the mobile WiMAX system resource exploitation of the downlink direction Journal Article
In: Wireless Personal Communications, vol. 77, no. 2, pp. 1117-1127, 2014.
Περίληψη | BibTeX | Ετικέτες: IEEE 802.16e, mapping, OFDMA, Performance analysis, Resource utilization, Simulation, WiMAX | Σύνδεσμοι:
@article{Lagkas20141117,
title = {Analyzing the mobile WiMAX system resource exploitation of the downlink direction},
author = { T.D. Lagkas and P. Sarigiannidis and M. Louta},
url = {https://www.researchgate.net/publication/259442681_Analyzing_the_Mobile_WiMAX_System_Resource_Exploitation_of_the_Downlink_Direction},
doi = {10.1007/s11277-013-1557-2},
year = {2014},
date = {2014-01-01},
journal = {Wireless Personal Communications},
volume = {77},
number = {2},
pages = {1117-1127},
abstract = {Worldwide interoperability for microwave access (WiMAX) constitutes a viable networking technology, providing wireless connectivity in an efficient mannerIn this work, on the grounds of the defined frame structure, a novel performance analysis of the mobile WiMAX standard in terms of the downlink resource utilization is presentedThe analysis is validated via simulation, the results of which are also provided along with numerical results, studying the effectiveness of the OFDMA-based downlink mappingThe results reveal the relationship among the frame dimensions, the mapped request size, and the number of unexploited OFDMA slots. © 2013 Springer Science+Business Media New York.},
keywords = {IEEE 802.16e, mapping, OFDMA, Performance analysis, Resource utilization, Simulation, WiMAX},
pubstate = {published},
tppubtype = {article}
}
Worldwide interoperability for microwave access (WiMAX) constitutes a viable networking technology, providing wireless connectivity in an efficient mannerIn this work, on the grounds of the defined frame structure, a novel performance analysis of the mobile WiMAX standard in terms of the downlink resource utilization is presentedThe analysis is validated via simulation, the results of which are also provided along with numerical results, studying the effectiveness of the OFDMA-based downlink mappingThe results reveal the relationship among the frame dimensions, the mapped request size, and the number of unexploited OFDMA slots. © 2013 Springer Science+Business Media New York.
2012
M. Louta; P. Sarigiannidis; P. Nicopolitidis; G. Papadimitriou; M. Obaidat
Design of an effective QoS-aware mapping scheme using persistent allocation probing Conference
2012.
Περίληψη | BibTeX | Ετικέτες: IEEE 802.16, mapping, OFDMA, QoS, WiMAX | Σύνδεσμοι:
@conference{Louta20124909,
title = {Design of an effective QoS-aware mapping scheme using persistent allocation probing},
author = { M. Louta and P. Sarigiannidis and P. Nicopolitidis and G. Papadimitriou and M. Obaidat},
doi = {10.1109/ICC.2012.6364291},
year = {2012},
date = {2012-01-01},
journal = {IEEE International Conference on Communications},
pages = {4909-4913},
abstract = {Mobile Worldwide Interoperability for Microwave Access (WiMAX) constitutes an attractive trademark for supporting wireless access to Intranets and the Internet. Scheduling and mapping processes are of paramount importance since they dramatically affect the network performance. This work endeavors to provide a robust mapping scheme for the downlink sub-frame with respect to various Quality of Service (QoS) constraints. Each downlink request creates rectangular regions, called Horizons, and the mapping technique applies a persistent probing of the Horizons recorded. The evaluation experiments conducted indicate that the scheme designed beneficially affects the system performance. © 2012 IEEE.},
keywords = {IEEE 802.16, mapping, OFDMA, QoS, WiMAX},
pubstate = {published},
tppubtype = {conference}
}
Mobile Worldwide Interoperability for Microwave Access (WiMAX) constitutes an attractive trademark for supporting wireless access to Intranets and the Internet. Scheduling and mapping processes are of paramount importance since they dramatically affect the network performance. This work endeavors to provide a robust mapping scheme for the downlink sub-frame with respect to various Quality of Service (QoS) constraints. Each downlink request creates rectangular regions, called Horizons, and the mapping technique applies a persistent probing of the Horizons recorded. The evaluation experiments conducted indicate that the scheme designed beneficially affects the system performance. © 2012 IEEE.
2011
P. Sarigiannidis; M. Louta; A. Michalas
2011.
Περίληψη | BibTeX | Ετικέτες: extrapolation, IEEE 802.16, mapping, OFDMA, Splines, WiMAX | Σύνδεσμοι:
@conference{Sarigiannidis2011139,
title = {On effectively determining the downlink-to-uplink sub-frame width ratio for mobile WiMAX networks using spline extrapolation},
author = { P. Sarigiannidis and M. Louta and A. Michalas},
url = {https://www.researchgate.net/publication/221565459_On_Effectively_Determining_the_Downlink-to-Uplink_Sub-frame_Width_Ratio_for_Mobile_WiMAX_Networks_Using_Spline_Extrapolation},
doi = {10.1109/PCI.2011.44},
year = {2011},
date = {2011-01-01},
journal = {Proceedings - 2011 Panhellenic Conference on Informatics, PCI 2011},
pages = {139-143},
abstract = {One of the most valuable design issues of the Worldwide Interoperability for Microwave Access (WiMAX) standard is its flexibility. It allows multiple downlink-to-uplink duration definitions concerning the width of the corresponding sub-frames, thus, the telecommunication companies and businesses are able to define the downlink-to-uplink width from 3:1 to 1:1 respectively to meet the traffic demands of the connected subscribers. However, the decision on defining the most appropriate ratio is not yet solved, since current efforts on developing scheduling and mapping schemes consider it as fixed. In this work, a novel adaptive mapping approach - based on cubic spline extrapolation - is proposed in order to dynamically determine the most appropriate downlink-touplink width ratio in accordance to the downlink and uplink traffic demands. The method proposed is evaluated through realistic simulation scenarios, whereas its performance is compared with static approaches maintaining a fixed ratio. The results indicate that the approach suggested succeeds noticeable improvements in terms of network service capabilities and bandwidth utilization. © 2011 IEEE.},
keywords = {extrapolation, IEEE 802.16, mapping, OFDMA, Splines, WiMAX},
pubstate = {published},
tppubtype = {conference}
}
One of the most valuable design issues of the Worldwide Interoperability for Microwave Access (WiMAX) standard is its flexibility. It allows multiple downlink-to-uplink duration definitions concerning the width of the corresponding sub-frames, thus, the telecommunication companies and businesses are able to define the downlink-to-uplink width from 3:1 to 1:1 respectively to meet the traffic demands of the connected subscribers. However, the decision on defining the most appropriate ratio is not yet solved, since current efforts on developing scheduling and mapping schemes consider it as fixed. In this work, a novel adaptive mapping approach - based on cubic spline extrapolation - is proposed in order to dynamically determine the most appropriate downlink-touplink width ratio in accordance to the downlink and uplink traffic demands. The method proposed is evaluated through realistic simulation scenarios, whereas its performance is compared with static approaches maintaining a fixed ratio. The results indicate that the approach suggested succeeds noticeable improvements in terms of network service capabilities and bandwidth utilization. © 2011 IEEE.
A. Sarigiannidis; P. Nicopolitidis; G. Papadimitriou; P. Sarigiannidis; M. Louta
2011.
Περίληψη | BibTeX | Ετικέτες: IEEE 802.16, Learning automata, mapping, OFDMA, WiMAX | Σύνδεσμοι:
@conference{Sarigiannidis2011353,
title = {Using learning automata for adaptively adjusting the downlink-to-uplink ratio in IEEE 802.16e wireless networks},
author = { A. Sarigiannidis and P. Nicopolitidis and G. Papadimitriou and P. Sarigiannidis and M. Louta},
url = {https://www.researchgate.net/publication/221504931_Using_learning_automata_for_adaptively_adjusting_the_downlink-to-uplink_ratio_in_IEEE_80216e_wireless_networks},
doi = {10.1109/ISCC.2011.5983863},
year = {2011},
date = {2011-01-01},
journal = {Proceedings - IEEE Symposium on Computers and Communications},
pages = {353-358},
abstract = {IEEE 802.16e allows for flexibly defining the relation of the downlink and uplink sub-frames' width from 3:1 to 1:1, respectively. However, the determination of the most suitable ratio is left open to the network designers and the research community. Existing scheduling and mapping schemes are inflexibly designed. In this paper, a novel adaptive mapping scheme is proposed aiming to dynamically adjust the downlink-to-uplink ratio, following adequately the modification of the load requests with respect to both downlink and uplink directions. A learning automaton is exploited in order to sense the performance of the downlink and uplink mapping processes and to determine the most appropriate length ratio of both sub-frames in order to maximize the network performance. The suggested ratio determination scheme is evaluated through realistic scenarios and it is compared with static schemes that maintain a fixed ratio. The results show that our proposed scheme introduces considerable improvement, increasing the network's service ratio and reducing the bandwidth waste. © 2011 IEEE.},
keywords = {IEEE 802.16, Learning automata, mapping, OFDMA, WiMAX},
pubstate = {published},
tppubtype = {conference}
}
IEEE 802.16e allows for flexibly defining the relation of the downlink and uplink sub-frames' width from 3:1 to 1:1, respectively. However, the determination of the most suitable ratio is left open to the network designers and the research community. Existing scheduling and mapping schemes are inflexibly designed. In this paper, a novel adaptive mapping scheme is proposed aiming to dynamically adjust the downlink-to-uplink ratio, following adequately the modification of the load requests with respect to both downlink and uplink directions. A learning automaton is exploited in order to sense the performance of the downlink and uplink mapping processes and to determine the most appropriate length ratio of both sub-frames in order to maximize the network performance. The suggested ratio determination scheme is evaluated through realistic scenarios and it is compared with static schemes that maintain a fixed ratio. The results show that our proposed scheme introduces considerable improvement, increasing the network's service ratio and reducing the bandwidth waste. © 2011 IEEE.
2010
P.G. Sarigiannidis; M.D. Louta; P. Chatzimisios
A novel fair mapping scheme for IEEE 802.16 downlink sub-frame Conference
2010.
Περίληψη | BibTeX | Ετικέτες: Fairness, IEEE 802.16, mapping, OFDMA, Simulation | Σύνδεσμοι:
@conference{Sarigiannidis2010763,
title = {A novel fair mapping scheme for IEEE 802.16 downlink sub-frame},
author = { P.G. Sarigiannidis and M.D. Louta and P. Chatzimisios},
url = {https://www.researchgate.net/publication/221003449_A_novel_fair_mapping_scheme_for_IEEE_80216_downlink_sub-frame},
doi = {10.1109/ICUMT.2010.5676550},
year = {2010},
date = {2010-01-01},
journal = {2010 International Congress on Ultra Modern Telecommunications and Control Systems and Workshops, ICUMT 2010},
pages = {763-768},
abstract = {A novel fair mapping scheme is proposed in this paper for the IEEE 802.16 downlink sub-frame. The mapping process is critical since it allocates the users' requests into the downlink sub-frame in order to be sent to the mobile stations. One of the most noticeable issues in this area lies on the fairness aspect. Giving that the mapping process defines the order and the way that the users' requests are being serviced, some users may be treated unfairly. In this work this issue is considered and a new mapping scheme is introduced. The proposed scheme encloses fair and more efficient mapping process, compared to the leading scheme, according to the presented simulation results. ©2010 IEEE.},
keywords = {Fairness, IEEE 802.16, mapping, OFDMA, Simulation},
pubstate = {published},
tppubtype = {conference}
}
A novel fair mapping scheme is proposed in this paper for the IEEE 802.16 downlink sub-frame. The mapping process is critical since it allocates the users' requests into the downlink sub-frame in order to be sent to the mobile stations. One of the most noticeable issues in this area lies on the fairness aspect. Giving that the mapping process defines the order and the way that the users' requests are being serviced, some users may be treated unfairly. In this work this issue is considered and a new mapping scheme is introduced. The proposed scheme encloses fair and more efficient mapping process, compared to the leading scheme, according to the presented simulation results. ©2010 IEEE.
Διεύθυνση
Internet of Things and Applications Lab
Department of Electrical and Computer Engineering
University of Western Macedonia Campus
ZEP Area, Kozani 50100
Greece
Πληροφορίες Επικοινωνίας
tel: +30 2461 056527
Email: ithaca@uowm.gr
