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针对切换业务在高速铁路通信系统中比较容易掉线的问题,提出一种基于优先级的接纳控制机制,联合利用自适应资源预留算法与基于弹簧的资源抢占模型,以保障系统切换业务掉线率(HSDP)需求.自适应资源预留算法可以根据切换业务通话量强度自适应地为切换业务预留带宽资源.在最小化资源抢占对现有业务影响的条件下,基于弹簧的资源抢占模型可以确保切换业务从现有可变速率业务中合理地抢占带宽资源,以进一步改善HSDP性能.仿真结果表明,该机制可以有效提升HSDP性能,同时保持令人满意的新业务阻塞率性能.
Aiming at the problem that the switching service is easy to drop in the high-speed railway communication system, this paper proposes a priority-based admission control mechanism. The adaptive resource reservation algorithm and the spring-based resource preemption model are jointly used to ensure that the system handover service is dropped (HSDP) .An adaptive resource reservation algorithm can adaptively reserve bandwidth resources for the handover service according to the intensity of the handover traffic.Under the condition of minimizing the impact of resource preemption on the existing service, the spring-based resource preemption model Which ensures that the handover service can reasonably preempt bandwidth resources from existing variable rate services to further improve HSDP performance.The simulation results show that this mechanism can effectively improve HSDP performance while maintaining satisfactory performance of new service blocking rate.