摘要
提出了话音和数据综合业务LEO卫星通信系统的一种切换方案-动态信道抢占优先方案。该方案考虑了数据业务特性和话音切换业务的高优先级,并使用排队策略,为话音切换业务提供抢占优先权。该方案还采用了动态阈值的保护信道策略,保证了新呼叫和切换呼叫之间的优先级和公平性。通过计算机仿真,与无优先方案和传统保护信道方案进行比较,该方案使系统的服务等级和信道利用率性能得到了改善。
A handoff scheme is introduced in this paper, which considers the dynamic thresholds and preemptive priority level in intergrated voice and data LEO（Low Earth Orbit） satellite systems. Taking into account the characteristic of data calls and the higher priority of handoff voice calls, this scheme gives handoff voice calls a preemptive priority with combination of queuing strategy. A Guard Channel scheme based on dynamic thresholds is used in the scheme. It guarantees the priority and fairness between new calls and handoff calls. By simulation, it can be seen through comparison with the non-priority and guard channel handoff scheme that the proposed handoff scheme improves the performance of system in grade of service and channel utilization.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2005年第4期456-459,共4页
Journal of University of Electronic Science and Technology of China
基金
国家自然科学基金资助项目(60372013)
关键词
非静止轨道卫星
切换
抢占优先
动态阈值
low earth orbit
handoff
preemptive priority
dynamic thresholds
