| 摘要 |
A signalling system provides for efficient reception of message by a plurality of Earth based selective call receivers (30) such as pagers. The signals are transmitted from satellites (10) in orbit above the Earth. Each satellite (10) includes a multiple lobe antenna (14) capable of transmitting messages to a selected portion of the surface of the Earth. Methods for conserving satellite transmission power in the communication of message information are described. Furthermore, a signalling protocol transmitted by the satellite (10) provides for power conservation by Earth based selective call receivers (30). Additionally, a method enabling an area of the Earth to receive messages from multiple satellites is described. |
