【摘要】 针对异构分层无线网络提出了一种保证业务QoS的切换策略。该策略在层间呼叫双向溢出基础上,为实时业务切换设置了保护信道,为非实时业务切换设置了缓冲队列。为了进一步降低实时业务切换的掉线率,还使用了信道侵占技术,原理是实时业务切换呼叫可以侵占数据业务正在使用的信道资源。仿真结果表明,提出的切换方法能够显著降低各类切换业务的掉线率,同时整个异构分层系统的信道利用率也略有提高。更多还原

【Abstract】 A handoff strategy was proposed to guarantee the traffic QoS in heterogeneous hierarchical wireless networks.Based on the bidirectional call-overflow between different networks,guard channels were set for real-time traffic handoffs and buffer queues were set for non-real-time traffic handoffs.In order to further decrease the dropping probability of real-time traffic handoffs,preemption scheme was also used,which principle is that real-time traffic handoffs can preempt the channels used by the ongoing non-real-time traffic.Simulation results show that the proposed handoff control scheme can evidently decrease the dropping probability of each type of traffic,the channel utilization of overall heterogeneous system is slightly increased simultaneous.更多还原