| 摘要 |
A cellular telecommunications system includes at least one base station and at least one user terminal that is bidirectionally coupled to the at least one base station through an RF interface. The system further includes system circuitry for composing messages and transmitting composed messages continuously over a forward RF link to the at least one user terminal. The messages include filler messages and other messages, and the circuitry composes the messages for specifying in a transmitted message a number of filler messages that will be consecutively transmitted. The user terminal includes a receiver for receiving messages from the forward RF link and circuitry for determining a number of consecutive filler messages that will be transmitted. The user terminal further includes a controller that is responsive to a received message for placing the user terminal in a powered-down state for a period of time that is a function of the number of consecutive filler messages. In a preferred embodiment of this invention the message is repeated a plurality of times during a message frame, and the user terminal receives at least one repeat of the message. Also in a preferred embodiment of this invention, the message employs bits that are specified as reserved bits for transmitting the number of filler messages, thus making the teaching of this invention downwards compatible with existing cellular telecommunications systems, such as that specified by EIA/TIA-553 and similar systems. |
