Dynamic wireless access methods with applications to eHealth services

Description

For opportunistic spectrum access and spectrum sharing in cognitive radio networks, one key problem is how to develop wireless access schemes for secondary users so that harmful interference to primary users can be avoided and quality-of-service
(QoS) of secondary users can be guaranteed. In this research, dynamic wireless access protocols for secondary users are designed and optimized for both infrastructure-based and ad-hoc wireless networks.


Under the infrastructure-based model, the secondary users are connected through a controller (i.e., an access point). In particular, the problem of wireless access for eHealth applications is considered. In a single service cell, an innovative wireless access scheme, called electromagnetic interference (EMI)-aware prioritized wireless access, is proposed to address the issues of EMI to the medical devices and QoS differentiation for different eHealth applications. Afterwards, the resource management problem for multiple service cells, specifically, in multiple spatial reuse time-division multiple access (STDMA) networks is addressed. The problem is formulated as a dual objective optimization problem that maximizes the spectrum utilization of secondary users and minimizes their power consumption subject to the EMI constraints for active and passive medical devices and minimum throughput guarantee for secondary users. Joint scheduling and power control algorithms based on greedy approaches are proposed to solve the problem with much less computational complexity.


In an ad-hoc wireless network, the robust transmission scheduling and power control problem for collision-free spectrum sharing between secondary and primary users in STDMA wireless networks is investigated. Traditionally, the problem only considers the average link gains; therefore, QoS violation can occur due to improper power allocation with respect to instantaneous channel gain realization. To overcome this problem, a robust power control problem is formulated. A column generation based algorithm is proposed to solve the problem by considering only the potential subset of variables when solving the problem. To increase the scalability, a novel distributed two-stage algorithm based on the distributed column generation method is then proposed to obtain the near-optimal solution of the robust transmission schedules for vertical spectrum sharing in an ad-hoc wireless network.

Links & Downloads

1. P. Phunchongharn, E. Hossain, and S. Camorlinga, "Distributed Scheduling and Power Control for Cognitive Spatial-Reuse TDMA Networks," in Proc. of IEEE International Workshop on Small Cell Wireless Networks in Conjunction with IEEE Int. Conf. on Communications (ICC'12), 10-15 June, Ottawa, Canada, 2012.
2. P. Phunchongharn, E. Hossain, K. W. Choi, and S. Camorlinga, "Robust transmission scheduling and power control for spectrum sharing in spatial reuse TDMA wireless networks," in Proc. of IEEE Global Communications Conference (Globecom'11), 5-9 December, Houston, TX, USA, 2011.
3. P. Phunchongharn, E. Hossain, D. Niyato, and S. Camorlinga, "Robust transmission scheduling and power control for dynamic wireless access in a hospital environment,'' in Proc. of IEEE International Conference on Communications (ICC'11), 5-9 June, Kyoto, Japan, 2011.
4. P. Phunchongharn, E. Hossain, L. Le, and S. Camorlinga, "Robust Scheduling and Power Control for Vertical Spectrum Sharing in STDMA Wireless Networks,'' IEEE Transactions on Wireless Communications, Vol. 11, Issue 5, pp. 1850--1860, May 2012.
5. P. Phunchongharn, E. Hossain, and S. Camorlinga, "Electromagnetic Interference-Aware Transmission Scheduling and Power Control for Dynamic Wireless Access in Hospital Environments,'' IEEE Transactions on Information Technology in Biomedicine, Vol. 15, Issue 6, pp. 890--899, November 2011.
6. P. Phunchongharn, D. Niyato, E. Hossain, and S. Camorlinga, "An EMI-Aware Prioritized Wireless Access Protocol for E-Health Applications in Hospital Environments,'' IEEE Transactions on Information Technology in Biomedicine, Vol. 14, Issue 5, pp. 1247--1258, April 15, 2010.
7. P. Phunchongharn, D. Niyato, E. Hossain, and S. Camorlinga, "A Cognitive Radio System for e-Health Applications in a Hospital Environment,'' IEEE Wireless Communications Magazine, Special Issue on ``Wireless Technologies for E-healthcare", Vol. 17, Issue 1, pp. 20-- 28, February, 2010.
8. P. Phunchongharn, E. Hossain, and S. Camorlinga, "Cognitive Radio for Pervasive Healthcare,'' invited chapter in Cognitive Radio Networks: Architectures, Protocols and Standards, (Eds. Y. Zhang, J. Zheng, and H. Chen ), Auerbach Publications, CRC Press, Taylor & Francis Group, 2009.
9. http://hdl.handle.net/1993/9231

Tags

dynamic wireless access

interference control

robust optimization

scheduling

power control

eHealth applications

cognitive radio

Additional Fields

Identifer	oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:MWU.1993/9231
Date	January 2009
Creators	Phunchongharn, Phond
Contributors	Hossain, Ekram (Electrical and Computer Engineering), McLeod, Robert (Electrical and Computer Engineering) Cai, Jun (Electrical and Computer Engineering) Eskicioglu, Rasit (Computer Science) Haykin, Simon (McMaster University)
Publisher	IEEE, IEEE, IEEE, IEEE, IEEE, IEEE, IEEE, Auerbach Publications
Source Sets	Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada
Detected Language	English