Reverse-link capacity of multiband overlaid DS-CDMA systems
Mobile Networks and Applications - Analysis and Design of Multi-Service Wireless Networks
Overlaying CDMA systems with interference differentials
Mobile Networks and Applications
Computers and Electrical Engineering
Journal of Network and Systems Management
Call admission control for CDMA mobile communications systems supporting multimedia services
IEEE Transactions on Wireless Communications
Adaptive cell sectorization for CDMA systems
IEEE Journal on Selected Areas in Communications
IEEE Journal on Selected Areas in Communications
Expert Systems with Applications: An International Journal
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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.