| 摘要 |
In a communications system, in the embodiment, a satellite communications system, transactional messages 28 36 are exchanged between the user terminal 14 and a base station (earth station) 16 via a communications satellite 10 in order to set up and maintain the progress of a call, encompass occasional user terminal registration and position estimation, allow call termination and attend to a host of other housekeeping processes. The prior art required the sending of acknowledgement messages 32 between transactional messages. The invention replaces the sending and requesting of acknowledgement messages 32 with an each-end recognition of the style of transactional responses as an ipse facto acknowledgement, thereby much speeding up the transactional message and transactional response/message exchange, so releasing time resources to the system.
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