卫星星座通信系统掉线挂机申请策略

Call Drop Terminating Strategies in Satellites Constellations Communication System

卫星星座通信系统中,无物理可见卫星、切换不及时和应答丢失造成正在通信的移动终端被迫掉线,挂机申请如不能及时送至网络管理中心,则无法正常释放信道资源,导致系统阻塞率增加.针对这一问题提出了广播挂机申请及利用位置寻呼信息路由挂机申请的策略,可以有效地降低系统的阻塞概率.通过仿真可以验证,两种方案产生的信令开销远小于系统总的呼叫信令开销,处理时延也在可接受的范围内.

Call drop will occur when no satellite can be visible, handoff is not real-time and the corresponding response is lost in satellites constellations communication system. If the call drop terminating request cannot be sent to network management center in time, the channel resource cannot be released. Then the rate of call blocked may increase. In order to solve this problem, two tactics, broad- cast the terminating request and use the location paging information to route the terminating request are put forward. Both of the tactics can decrease the rate of call blocked. The results of the simulation prove that the additional signaling cost of both tactics is far from the cost of the system call signaling, and the dealing delay is acceptable as well.