Circuit and method for providing simultaneous transmission of page data in a paging system

• US 6,239,720 B1
• Filed: 03/24/1998
• Issued: 05/29/2001
• Est. Priority Date: 05/10/1997
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Sung Hak, Kim, Chang Ho
• Primary Examiner(s): ZIMMERMAN, BRIAN A
• Application Number:
  US09/046,916
• Time in Patent Office: 1,162 Days
• Field of Search: 340/825.44, 340/825.46, 340/311.1, 340/825.69, 340/286.01, 370/313, 349/168, 445/31.1, 445/38.4, 455/426, 455/502, 455/503
• US Class Current: 340/5.1
• CPC Class Codes: H04W 84/022 One-way selective calling networks, e.g. wide area paging

Abstract

A circuit and method which provides the simultaneous transmission of page data in a paging system by delaying a reference clock signal from a global positioning system. The method for the simultaneous transmission of page data in a paging system comprises the steps of: inputting the reference clock signal from the Global Positioning System (GPS) receiver into a plurality of transmitter controllers of the paging system; delaying, by a value of 1−X seconds, the reference clock signal which is input into each of the transmitter controllers, the value of X being a delay time associated with the transmitter associated with each of the transmitter controllers; sending the page data from the plurality of transmitter controllers to each of the associated transmitters in accordance with the delayed clock signal; and transmitting the page data from the plurality of transmitters simultaneously, whereby the simultaneous transmission of page data is synchronized with the reference clock signal from the GPS receiver, notwithstanding the delay time associated with each of the transmitters.

Claims

1. In a paging system having a plurality of transmitters each having a respective transmission delay, a plurality of delay compensation circuits each associated with a transmitter and each for individually compensating for the respective transmission delay of each transmitter to provide simultaneous transmission of page data among the plurality of transmitters by using a reference clock signal from a global positioning system (GPS) receiver, each delay compensation circuit comprising:

a data bus;

a latch, connected to said data bus and responsive to a latch input signal, for receiving a signal from said data bus;

a counter/controller, connected to said data bus and responsive to a reference clock signal received from said GPS receiver (1PPS), for counting a series of pulses of a counter reference clock signal and generating a counter output signal in response thereto, whereby said counter/controller begins counting said pulses of said counter reference clock signal in response to said 1PPS signal; and

a comparator, connected to said latch and said counter/controller, for receiving said data bus signal from said latch and for generating a delayed 1PPS signal (1PPS′

) in response to said data bus signal received from said latch and said counter output signal from said counter/controller.

2. The circuit of claim 1, wherein said comparator outputs said 1PPS′

signal when said counter output signal is equal to said data bus signal.

3. The circuit of claim 1, wherein said counter/controller is reset when said 1PPS′

signal is output from said comparator.

4. The circuit of claim 1, wherein said data bus signal corresponds to the delay time of a transmitter in said paging system.

5. The circuit of claim 1, wherein said 1PPS′

signal serves as a timing reference by a transmitter controller for sending page data to a transmitter associated with said transmitter controller in said paging system.

6. The circuit of claim 5, wherein the page data is transmitted from said transmitter, said transmission of page data being synchronized to said 1PPS signal.

7. In a paging system having a plurality of transmitter controllers for receiving page data, and a plurality of transmitters, each associated with a corresponding one of said transmitter controllers for modulating and transmitting said page data received from said corresponding transmitter controller, a method for the simultaneous transmission of page data, comprising the steps of:

receiving by said plurality of transmitter controllers, a reference clock signal from a Global Positioning System (GPS) receiver;

delaying, by a value of 1−

X seconds, said reference clock signal which is received by each of said transmitter controllers, said value of X being a delay time associated with each of the transmitters corresponding to each of said transmitter controllers;

sending said page data from said plurality of transmitter controllers to each of said corresponding transmitters in accordance with said delayed reference clock signal; and

transmitting said page data from said plurality of transmitters simultaneously, said simultaneous transmission of page data being synchronized with said reference clock signal from said GPS receiver.

8. A paging system for providing the simultaneous transmission of page data, comprising:

means for receiving a reference clock signal from a Global Positioning System (GPS) receiver by a plurality of transmitter controllers;

means, operatively connected to each of said transmitter controllers, for delaying, by a value of 1−

X seconds, said reference clock signal;

means for sending said page data from said plurality of transmitter controllers to a plurality of transmitters, each corresponding to one of said plurality of transmitter controllers, in accordance with said delayed reference clock signal, said value of X representing the delay time of each of the transmitters; and

means for simultaneously transmitting said page data from said plurality of transmitters, wherein said simultaneous transmission of page data is synchronized with said reference clock signal from said GPS receiver.