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在单播与多播混合服务的OFDM蜂窝系统中,因负载较重而使带宽资源被完全占用时,为接纳更多的多播用户,在单播多媒体用户可接受的范围内提出:基于信道容量平滑的QoS升降级带宽借用方法.通过建立QoS升降级的子载波借用模型和CUpDown-QoS算法,达到最大化多播用户数和减小多播切换呼叫中断率;提出了GoS保证下,限制新呼叫的动态带宽借用阈值,给出基于Markov模型的CBP(Call Blocking Probability)与HDP(Handoff Dropping Probability)最优折中的阈值确定方法,以及多播优先的动态带宽借用策略对阈值确定的影响.
In unicast and multicast mixed-service OFDM cellular systems, when bandwidth resources are completely occupied due to heavy load, in order to accommodate more multicast users, it is proposed in the unicast multimedia user’s acceptable range that channel-based Capacity smoothing QoS promotion and de-rating bandwidth borrowing method.By establishing a QoS sub-carrier borrowing model and CUpDown-QoS algorithm, the maximum number of multicast users and the reduction of multicast handover call interruption rate can be achieved. The threshold of dynamic bandwidth borrowing threshold for new calls is given to determine the threshold of CBP (Call Blocking Probability) and Handoff Dropping Probability (HDP) based on Markov model, and the impact of multicast-preferred dynamic bandwidth borrowing strategy on threshold determination .