Multiplex communications – Communication over free space – Combining or distributing information via time channels
Reexamination Certificate
1998-07-20
2001-11-13
Chin, Wellington (Department: 2664)
Multiplex communications
Communication over free space
Combining or distributing information via time channels
C370S510000, C370S511000, C370S512000
Reexamination Certificate
active
06317425
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for interfacing between a cellular telephone and a personal data assistant (PDA) in a radio multi-terminal communications system, and in particular, to a data synchronizing method and system for allowing a cellular telephone and a PDA to share data.
2. Description of the Related Art
FIG. 1
shows a block diagram of a radio multi-terminal communications system which is divided into a cellular telephone
200
, being a first communication terminal, and a personal data assistant (hereinafter called PDA)
100
, being a second communication terminal.
First, as for the cellular telephone
200
, a second CPU (Central Processing Unit)
211
controls the overall operations of the cellular telephone
200
and communicates with a first CPU
111
in the PDA
100
. A program memory
212
, being a flash memory, stores a control program of the second CPU
211
. A data memory
213
, being a RAM (Random Access Memory), temporarily stores data generated during operations of the cellular telephone
200
. A nonvolatile memory
214
, being an EEPROM (Electrically Erasable and Programmable Read Only Memory), stores telephone numbers registered for abbreviated dialing (or speed dialing) and system parameters. A keypad
215
generates command key signals for controlling the second CPU
211
and key signals for inputting data. A display
216
, under the control of the second CPU
211
, displays state information generated during operations of the cellular telephone
200
. An LCD (Liquid Crystal Display) may be used for the display
216
.
In addition, the cellular telephone
200
includes a communication module including an RF (Radio Frequency) interface
217
, a frequency converter
218
, a MODEM (Modulator-Demodulator)
219
, and a signal processor
220
. The communication module is controlled by the second CPU
211
. The signal processor
220
is composed of an interleaver and encoder, a deinterleaver and decoder, a vocoder, and a PCM CODEC (Pulse Code Modulation Coder-Decoder).
Here, it should be noted that the communication module is missing a transmission part and a reception part, omitted as a matter of convenience. Further,
FIG. 1
is missing control signal lines for the second CPU
211
, a voice signal processor, and a transceiver, also omitted as a matter of convenience.
During a transmission mode, the signal processor
220
encodes transmission data, and the MODEM
219
modulates the encoded transmission data. The frequency converter
218
up-converts the modulated transmission signal to a transmission frequency band, and the RF interface
217
filters the RF transmission signal output from the frequency converter
218
to pass the transmission band frequency signals only. Further, the RF interface
217
amplifies the transmission signals and radiates the amplified transmission signals to the air via an antenna.
During a reception mode, the RF interface
217
low-noise-amplifies the low power RF signals received via the antenna and filters them to pass the reception band frequency signals only. The frequency converter
218
down-converts the received RF signals to the baseband signal, and the MODEM
219
demodulates the output signals of the frequency converter
218
.
Next, as for the PDA
100
, the first CPU
111
controls the overall operations of the PDA
100
and communicates with the second CPU
211
in the cellular telephone
200
. A program memory
112
, being a flash memory, stores a control program of the first CPU
111
. A data memory
113
, being a RAM, temporarily stores data generated during operations of the PDA
100
under the control of the first CPU
111
. A nonvolatile memory
114
, being an EEPROM, stores information input by the user and information received from the cellular telephone
200
. A keypad
115
generates command key signals for controlling the first CPU
111
and key signals for inputting data. A display
116
, composed of an LCD, displays the status information generated during operations of the PDA
100
under the control of the first CPU
111
. A communication module
117
forms a data communication channel between the PDA
100
and the cellular telephone
200
by way of an UART (Universal Asynchronous Receiver Transmitter)
150
.
For instance, the cellular telephone
200
may be a CDMA (Code Division Multiple Access) terminal and the PDA
100
may be a hand-held computer such as a notebook computer.
As illustrated in
FIG. 1
, in the radio multi-terminal communications system, the first CPU
111
in the PDA
100
asynchronously communicates with the second CPU
211
in the cellular telephone
200
by way of the UART
150
. Here, the message transmitted therebetween has an HDLC (High-level Data Link Control) format and a transfer rate of 57.6 Kbps. The UART
150
is an asynchronous transceiver with serial-to-parallel and parallel-to-serial conversion functions, for transmitting data. With this combination, the PDA
100
can graphically process user interface data input from the cellular telephone
200
.
As described, the radio multi-terminal communications system transmits data in the asynchronous simplified HDLC format in order to allow the cellular telephone
200
and the PDA
100
to share the data. Conventionally, upon occurrence of an event, the cellular telephone
200
and the PDA
100
interchange data to share it, thereby providing a real time service to the user. However, such a data communication method leads to a reduction in the operating time (or run-time) of a battery. To save the battery, the system may transmit the data upon request of the user. However, in such a case, the system cannot provide the real time service.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a data synchronizing method for allowing a cellular telephone and a PDA in a radio multi-terminal communications system to share data.
It is another object of the present invention to provide a data synchronizing method for prioritizing data to be shared and processing the data according to a priority order.
To achieve the above objects, the present invention provides a data synchronizing method for a radio multi-terminal communications system including a cellular telephone and a PDA. In the method, the messages transmitted between the cellular telephone and the PDA are prioritized. The cellular telephone and the PDA interchange the message data according to the set priority order, thereby sharing the data with reduced data processing time.
Preferably, the message transmitted between the cellular telephone and the PDA has the format including a priority type and a command type. The priority type is divided into a first priority type assigned to a message to be shared immediately, a second priority type assigned to a message to be shared according to a user's decision, a third priority type assigned to a message to be shared according to the user's decision upon checking current states of the cellular telephone and the PDA. Further, the command type is divided into a request command responsive to which the PDA requests to the cellular telephone to transmit data to be shared, a response command responsive to which the cellular telephone transmits to the PDA a response to said request command, a set command responsive to which the PDA requests the cellular telephone to update the data, and an indication command responsive to which the cellular telephone requests the PDA to store the data.
A radio multi-terminal communications system, in accordance with the present invention, includes a first cellular device, and a second cellular device having a couplable interface therebetween, the couplable interface including a transceiver for transmitting and receiving two-way communications between the first cellular device and the second cellular device. The communications include prioritized messages and command types of the messages transmitted between the first cellular device and the second cellular device. The first cellular device and the secon
Chin Wellington
Dilworth & Barrese LLP
Pham Brenda H.
Samsung Electronics Co,. Ltd.
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