Abstract:

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: broadcast 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.

Key words: satellites constellations, location update, paging, call drop