Modeling of Adaptive Load Balancing with Hybrid F/CDMA and Sectorization Schemes in Mobile Communication Networks

• Published in: Journal of network and systems management Vol. 18; no. 4; pp. 395 - 417
• Main Authors: Chu, Kuo-Chung, Lin, Frank Yeong-Sung, Wang, Chun-Sheng
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.12.2010; Springer Nature B.V
• Subjects: Antennas; Bandwidths; Code Division Multiple Access; Combinatorial analysis; Communication; Communications Engineering; Communications networks; Computer Communication Networks; Computer Science; Computer Systems Organization and Communication Networks; HFC; Information management; Information Systems and Communication Service; Integer programming; Load; Load balancing; Load balancing (computing); Mobile communications networks; Networks; Operations Research/Decision Theory; Performance enhancement; Power control; Quality of service; Sensitivity analysis; Spectrum allocation; Studies; Traffic engineering; Traffic flow; Performance modeling; Adaptive load balancing (ALB); Sensitivity analysis; Mobile communications; Hybrid F/CDMA scheme (HFCS); Quality of service
• ISSN: 1064-7570; 1573-7705
• DOI: 10.1007/s10922-009-9149-x

In this paper, we investigate the load balancing problem in mobile communications by considering sectorization and a hybrid F/CDMA scheme (HFCS) jointly in the scenario of uneven traffic distributions. The problem is formulated as a combinatorial optimization model, subject to quality of service (QoS) requirements, and solved by the Lagrangean relaxation approach. In addition, Lagrangean multipliers are used to conduct sensitivity analysis. The model’s objective is to minimize the weighted call blocking rate in terms of the distribution diversity. The model’s performance is evaluated by the proposed HFCS, which is an adaptive scheme (AS). We compare the performance of AS with that of a non-adaptive (NA) scheme, which is a common power control method. Experiment results show that combining sectorization with the bandwidth segmentation scheme provides effective adaptive load balancing (ALB). The performance improvement achieved by the proposed adaptive scheme over the common power control scheme is as high as 68%. Moreover, under the scheme, the performance improves as the traffic load increases. Load balancing improves even further when AS is combined with the sectorization.