Authors: Rong Chai Huili Zhang Xiaoyu Dong Qianbin Chen Tommy Svensson
Publish Date: 2014/01/31
Volume: 20, Issue: 6, Pages: 1557-1571
Abstract
The rapid development of mobile broadband services with continuously increasing traffic volumes has resulted in a number of challenges including ubiquitous network coverage high bandwidth and reliable services for reasonable price etc To address these challenges evolved packet system EPS is proposed as the evolution of the packet core network While resource management and load balancing issues in EPS are discussed in 3GPP standardization relatively few research works consider mechanism design for load information monitoring and evaluation Furthermore even though some load balancing algorithms have been proposed for integrated networks the load balancing scheme design which achieves the optimization of joint system performance has not been extensively studied In this paper an interaccess system anchor based load balancing mechanism is introduced which performs load monitoring and evaluation for access gateways and networks and an optimal load balancing algorithm is proposed for heterogeneous integrated networks To characterize the performance of integrated networks the concept of utility function is introduced and the comprehensive performance of integrated networks which support both single type service and multimedia service is modeled mathematically Applying vertical handoff as an efficient mechanism for achieving load balancing the optimal number of handoff users is obtained through solving the optimization problem Numerical results demonstrate that load balancing between access networks can be achieved and the optimal number of handoff users corresponding to the maximal joint network utility can be obtainedThis work was supported by National Natural Science Foundation of China 61102063 61171111 National Science and Technology Specific Project of China 2011ZX0300500402 the special fund of Chongqing key laboratory CSTC and the project of Chongqing Municipal Education Commission Kjzh11206
Keywords: