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Details
Inventors: Kivari, Raimo;
Assignee: Nokia Mobile Phones Limited (Salo, FI)
Primary Examiner: Vo; Nguyen
Assistant Examiner:
Attorney, Agent or Firm: Perman & Green, LLP

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.

DETAILED DESCRIPTION The foregoing and other problems are overcome and the objects of the invention are realized by methods and apparatus in accordance with embodiments of this invention.
A method of this invention is disclosed for operating a user terminal, such as a cellular radiotelephone, of a type that is bidirectionally coupled to a system through an RF interface.
The method includes a first step of receiving a message from the system, the message specifying at least in part a number of consecutive filler messages that will be transmitted.
The method includes a second step of placing the user terminal in a powered-down or a reduced power state for a period of time that is a function of the number of consecutive filler messages.
A cellular telecommunications system in accordance with this invention 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 or a reduced power 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


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