| 摘要 |
In a mobile satellite communication system including a land-earth station which communicates with a mobile earth station via a satellite, a method is employed for providing an overlay short messaging service. According to the method, a short messaging service is selected. In addition, a short message is transmitted from one of the land earth station and the mobile earth station via the satellite to the other. The short message is transmitted in one of a plurality of out-of-band signalling channels. The transmission occurs at a time when no signalling information is being transmitted.
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