System for storage and communication of information

• US 5,530,702 A
• Filed: 05/31/1994
• Issued: 06/25/1996
• Est. Priority Date: 05/31/1994
• Status: Expired due to Term

• Current Assignee: Mobile Technics LLC (Intellectual Ventures LLC), Ludwig Kipp
• Original Assignee: Ludwig Kipp
• Inventors: Marudarajan, Anaikuppam, Palmer, John P., Tran, Joseph
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): HOM, SHICK C
• Application Number:
  US08/251,522
• Time in Patent Office: 756 Days
• Field of Search: 370/85.3, 370/60, 370/94.1, 370/18, 370/110.1, 370/61, 370/94.3, 370/85.2, 235/383, 235/385
• US Class Current: 370/445
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
• CPC Class Codes: G06K 7/10059 transponder driven
• CPC Class Codes: G07G 1/0054 with control of supplementary check-parameters, e.g. weight or number of articles

Abstract

A system and method for storage and communication of information between at least one first information containing terminal and a second terminal. The system and method includes generating a random number within the first terminal in response to receipt of a begin signal from the second terminal, and comparing the random number to a count incremented and maintained by a digital counter within the first terminal. When the random number is equal to the count, the first terminal transmits a request to transmit signal to the second terminal. If the second terminal responds with a first acknowledgment, the first terminal then sends an information containing signal to the second terminal. If the information containing signal is correctly received, the second terminal responds by transmitting a second acknowledgment which is received by the first terminal.

Claims

1. A method of communicating between at least one information containing data terminal included in a system having a plurality of information containing data terminals and a network controller comprising the steps of:

(a) initializing each of said plurality of information containing data terminals in response to receipt of a begin signal transmitted from the network controller to each of said information containing data terminals;

(b) generating a random number within each of said information containing data terminals following initialization in response to said begin signal;

(c) incrementing a counter in each of said information containing data terminals in response to the passage of successive time periods;

(d) comparing the random number with the count maintained by the counter during successive time periods;

(e) transmitting a request to transmit signal by said at least one information containing data terminal to the network controller when the random number in the said at least one information containing data terminal equals the count maintained by the corresponding counter in said at least one information containing data terminal; and

(f) transmitting a data-containing signal to the network controller if a first acknowledgment signal, which does not specifically identify the said at least one information containing data terminal, is received by the said at least one information containing data terminal from the network controller within a predetermined time period after the said at least one information containing data terminal transmits said request to transmit signal.

7. The method according to claim 1 wherein the mode of transmission between the plurality of data terminals and the network controller is serial, wireless radio frequency.

8. The method according to claim 1 wherein each of the plurality of data terminals is conformably attached to an article.

9. The method according to claim 1 wherein the data-containing signal contains an article identification code, said data-containing signal being read out from a memory device in each data terminal during said step of transmitting.

2. A method of communicating between at least one information containing data terminal included in a system having a plurality of information containing data terminals and a network controller comprising the steps of:

(a) initializing each of said plurality of information containing data terminals in response to receipt of a begin signal transmitted from the network controller to each of said information containing data terminals;

(b) generating a random number within each of said information containing data terminals following initialization in response to said begin signal;

(c) incrementing a counter in each of said information containing data terminals in response to the passage of successive time periods;

(d) comparing the random number with the count maintained by the counter during successive time periods;

(e) transmitting a request to transmit signal by said at least one information containing data terminal to the network controller when the random number in the said at least one information containing data terminal equals the count maintained by the corresponding counter in said at least one information containing data terminal;

(f) generating a new random number by said at least one information containing data terminal and repeating steps (c)-(e) if a first acknowledgment signal is not received from the network controller within a first predetermined time period after the said at least one information containing data terminal transmits said request to transmit signal; and

(g) transmitting a data-containing signal to the network controller if said first acknowledgment signal, which does not specifically identify the said at least one information containing data terminal, is received by the said at least one information containing data terminal from the network controller within a second predetermined time period after the said at least one information containing data terminal transmits said request to transmit signal.

3. The method according to claim 2 further comprising the steps of:

(a) temporarily suspending operation of the counter in each of said information containing data terminals if the first acknowledgment signal is received from the network controller prior to the each of said information containing data terminals transmitting a request to transmit signal; and

(b) resuming operation of the counter in each of said information containing data terminals if a second acknowledgment signal is received from the network controller within a predetermined time period after suspension of operation.

4. The method according to claim 3 further comprising the step of retransmitting a data-containing signal if a second acknowledgment signal is not received from the network controller within a third predetermined time period after the said at least one information containing data terminal transmits said data-containing signal, and terminating communication if a second acknowledgment signal is received within the predetermined time period.

5. The method according to claim 4 further comprising the step of terminating communication if neither said first acknowledgment signal nor said second acknowledgment signal is received from the network controller within a predetermined time period after initialization of the said at least one data terminal.

6. The method according to claim 5 further comprising the step of powering down and permanently disabling each of the plurality of information containing data terminals if a third acknowledgment signal is received from the network controller after the second acknowledgment signal is received.

10. The method according to claim 2 wherein the data-containing signal contains an article identification code, said data-containing signal being read out from a memory device in each data terminal during said step of transmitting.

11. A data terminal for use in a system including a plurality of data terminals for communicating with a network controller comprising:

(a) a random number generator which generates a random number in response to a begin signal received from the network controller;

(b) a counter which increments and maintains a count in response to the passage of successive time periods;

(c) a comparator which compares the random number with the count maintained by the counter during successive time periods;

(d) a transmitter which transmits a request to transmit signal to the network controller when the random number equals the count maintained by the counter and which transmits a data-containing signal to the network controller in response to receipt of a first acknowledgment signal which does not specifically identify a particular data terminal.

12. The data terminal of claim 11 wherein the random number generator generates a new random number if the first acknowledgment signal is not received from the network controller within a predetermined time period after transmission of the request to transmit signal by the transmitter.

13. A system for communicating information comprising:

at least one first information containing data terminal and a second terminal, said at least one first information containing data terminal including;

a random number generator which generates a random number in response to a begin signal received from the second terminal;

a counter which increments and maintains a count in response to the passage of successive time periods;

a comparator which compares the random number with the count maintained by the counter during successive time periods;

a first transmitter which transmits a request to transmit signal to the second terminal when the random number in the said at least one first information containing terminal equals the count maintained by the counter, and which transmits a data-containing signal to the second terminal in response to receipt of a first acknowledgment signal which does not specifically identify the said at least one first information containing data terminal after transmitting the request to transmit signal;

said second terminal including;

a second transmitter which transmits said begin signal to said at least one first information containing terminal, and which transmits said first acknowledgment signal in response to receipt of said request to transmit signal from the said at least one first information containing data terminal; and

a receiver which receives said request to transmit signal and said data-containing signal transmitted to said second terminal from the said at least one first information containing data terminal.

14. The system of claim 13 wherein said second transmitter transmits a second acknowledgment signal in response to receipt of said data-containing signal from said at least one first information containing data terminal.

15. The system of claim 14 wherein said second transmitter transmits a third acknowledgment signal in response to receipt of said data-containing signal from each of the said at least one first information containing terminals to which the second terminal transmitted the begin signal.

16. The system of claim 13 wherein said second transmitter transmits an information containing signal to be stored in a memory within each of said at least one first information containing data terminals.