提出异构网络中基于负载传递的联合接纳控制(LJAC, load-transfer-based joint admission control)算法,该算法基于负载均衡接纳用户的接入请求,在异构网络交叠覆盖区域引入业务的动态负载传递,同时考虑异构网络的布局以及垂直切换等因素的影响.将异构网络融合系统建模为多维马尔可夫链,获得稳态概率,推导异构网络融合系统的服务质量(QoS, quality of service)性能指标.基于泊松点过程理论,获得满足QoS限制时的异构网络容量上界.以最大化资源使用率同时保证用户的QoS为目标,优化异构网络融合系统的接纳参数.仿真结果表明,LJAC算法能实现更低的业务阻塞率和垂直切换请求失败率以及更高的系统容量增益.%A load-transfer-based joint admission control (LJAC) algorithm in heterogeneous networks was proposed. The access requirements of users were admitted based on load balancing, the dynamic load transfer of traffics in the overlap-ping coverage areas of heterogeneous networks were introduced, and the influence of such factors as the layout of heter-ogeneous networks and the vertical handoff was considered in the algorithm. The integrated system of heterogeneous networks was modeled as a multidimensional Markov chain, the steady-state probabilities were obtained and the quality of service (QoS) performance metrics were derived. Based on the Poisson point process theory, the upper bound of ca-pacity of the heterogeneous networks satisfying QoS limitations was obtained. The admission control parameters of the integrated system of heterogeneous networks were optimized in order to maximize the resource utilization rate as well as guaranteeing the QoS of users. The simulation results demonstrate lower traffic blocking probability, lower failure proba-bility of vertical handoff requirements, and larger system capacity gain can be achieved by using the proposed LJAC al-gorithm.
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