Joint Throughput Maximization and Fair Uplink Transmission Scheduling in CDMA Systems

Papavassiliou, S; Li, C

dc.contributor.author	Papavassiliou, S	en
dc.contributor.author	Li, C	en
dc.date.accessioned	2014-03-01T01:30:58Z
dc.date.available	2014-03-01T01:30:58Z
dc.date.issued	2009	en
dc.identifier.issn	1687-1499	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19698
dc.subject	Throughput Maximization	en
dc.subject.classification	Engineering, Electrical & Electronic	en
dc.subject.classification	Telecommunications	en
dc.subject.other	Cdma systems	en
dc.subject.other	Channel conditions	en
dc.subject.other	Code-division multiple-access	en
dc.subject.other	Control parameters	en
dc.subject.other	Fairness constraints	en
dc.subject.other	Fixed targets	en
dc.subject.other	Fundamental problems	en
dc.subject.other	Global searches	en
dc.subject.other	High throughputs	en
dc.subject.other	Knapsack problems	en
dc.subject.other	Optimal sets	en
dc.subject.other	Optimal solutions	en
dc.subject.other	Optimal transmissions	en
dc.subject.other	Optimization problems	en
dc.subject.other	Performance evaluations	en
dc.subject.other	Power indices	en
dc.subject.other	Qos constraints	en
dc.subject.other	Quality-of-service	en
dc.subject.other	Simple methods	en
dc.subject.other	Stochastic approximation methods	en
dc.subject.other	Through-put maximizations	en
dc.subject.other	Throughput maximization problems	en
dc.subject.other	Two-step approaches	en
dc.subject.other	Up-link transmissions	en
dc.subject.other	Uplink systems	en
dc.subject.other	Wireless systems	en
dc.subject.other	Approximation theory	en
dc.subject.other	Binary sequences	en
dc.subject.other	Control system analysis	en
dc.subject.other	Integer programming	en
dc.subject.other	Optimal systems	en
dc.subject.other	Scheduling	en
dc.subject.other	Throughput	en
dc.subject.other	Optimization	en
dc.title	Joint Throughput Maximization and Fair Uplink Transmission Scheduling in CDMA Systems	en
heal.type	journalArticle	en
heal.identifier.primary	10.1155/2009/564692	en
heal.identifier.secondary	http://dx.doi.org/10.1155/2009/564692	en
heal.identifier.secondary	564692	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	We study the fundamental problem of optimal transmission scheduling in a code-division multiple-access wireless system in order to maximize the uplink system throughput, while satisfying the users quality-of-service (QoS) requirements and maintaining fairness among them. The corresponding problem is expressed as a weighted throughput maximization problem, under certain power and QoS constraints, where the weights are the control parameters reflecting the fairness constraints. With the introduction of the power index capacity, it is shown that this optimization problem can be converted into a binary knapsack problem, where all the corresponding constraints are replaced by the power index capacities at some certain system power index. A two-step approach is followed to obtain the optimal solution. First, a simple method is proposed to find the optimal set of users to receive service for a given fixed target system load, and then the optimal solution is obtained as a global search within a certain range. Furthermore, a stochastic approximation method is presented to effectively identify the required control parameters. The performance evaluation reveals the advantages of our proposed policy over other existing ones and confirms that it achieves very high throughput while maintains fairness among the users, under different channel conditions and requirements. Copyright (C) 2009 S. Papavassiliou and C. Li.	en
heal.publisher	HINDAWI PUBLISHING CORPORATION	en
heal.journalName	Eurasip Journal on Wireless Communications and Networking	en
dc.identifier.doi	10.1155/2009/564692	en
dc.identifier.isi	ISI:000265974500001	en
dc.identifier.volume	2009	en