Telecommunications – Transmitter and receiver at separate stations
Reexamination Certificate
1998-06-01
2001-04-10
Bost, Dwayne D. (Department: 2744)
Telecommunications
Transmitter and receiver at separate stations
C455S039000, C455S343200, C340S870030
Reexamination Certificate
active
06215980
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to paging receivers and, more particularly, to an apparatus and method for saving battery power of a paging receiver when receiving messages.
2. Description of the Related Art
A Post Office Code Standardization Advisory Group (POCSAG) system, which is one of the current protocols used for paging receivers, transmits data asynchronously. Another currently used protocol is the FLEX™ Paging Protocol by Motorola, which employs a high speed paging system that transmits data synchronously. Referring to
FIG. 1A
, a diagram of a prior art POCSAG protocol signal used in a paging receiver is shown. The transmission of POCSAG is of a digital format and begins with preamble data of 576 bits followed by a plurality of batch data (generally 30 to 60 batches) which consists of address and message codewords. Particularly, one batch begins with a 32-bit synchronization codeword (“word sync”) followed by 8 frames each having 64 bits. Each frame has a duration equivalent to two codewords, i.e., a 32-bit address codeword and a 32-bit message codeword. Therefore, one batch consists of 544 bits of data, seventeen words of 32 bits.
Referring now to
FIG. 1B
, a structure of a combined channel with POCSAG and FLEX system having collapse information equal to 4, as well as an operating waveform BS of a conventional paging receiver at that channel is shown.
Generally, a conventional paging receiver of a paging system includes a radio frequency (RF) circuit which is repeatedly turned on and off at regular intervals in order to detect the presence or absence of a signal such as preamble data, for example, to detect an incoming message or call. Hence, the RF circuit of the paging receiver is energized irrespective of whether or not the paging receiver is receiving its corresponding signal. Consequently, power is unnecessarily expended thereby reducing the life of the battery of the paging receiver.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a system and method for conserving the power consumed from a battery during call reception in a paging receiver.
It is another object of the present invention to provide a system and method for minimizing the power consumed from a battery while detecting a self signal of a paging receiver in a POCSAG paging signaling system.
It is still another object of the present invention to provide a system and method for minimizing the power consumed from a battery while detecting a self signal of a POCSAG paging receiver at a combined channel using the POCSAG system and a FLEX system.
In one aspect of the present invention, an apparatus for saving battery power of a paging receiver having a radio frequency unit comprises a paging terminal for receiving a paging message, generating a POCSAG code in accordance with the paging message and sequentially assigning a corresponding time slot for transmission of the POCSAG, the POCSAG code having preamble data and a first batch as a head batch following the preamble, the header batch having time slot information associated with the paging receiver, whereby the paging receiver receives the POCSAG code transmitted from the paging terminal and detects the header batch, the paging receiver controlling the battery power of the radio frequency unit in accordance with the time slot information contained in the header batch.
In another aspect of the present invention, a method for saving a battery in a paging receiver having a decoder for decoding frame data to an original paging message, determining whether a data batch is POCSAG data based on a time slot number contained in a header batch, and means for communicating with a paging terminal through a combined channel, comprises the steps of: supplying a power source to a radio frequency unit, and assigning a header address for receiving the header batch and a data address for receiving the data batch to the decoder; determining whether one of the header address and the data address is detected; holding the decoder and setting a time of a decoder hold timer if only the header address is detected; and checking the time of the decoder hold timer, and if the setting time of the decoder hold timer elapses, releasing a hold state of the decoder and returning to the determining step.
These and other objects, features and advantages of the present invention will become apparent from the following detailed description of illustrative embodiments, which is to be read in connection with the accompanying drawings.
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Bost Dwayne D.
Dilworth & Barrese LLP
Gary Erika A.
Samsung Electronics Co,. Ltd.
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