Notification by energy burst of messages with unacceptable quality

• US 5,517,507 A
• Filed: 12/03/1993
• Issued: 05/14/1996
• Est. Priority Date: 12/03/1993
• Status: Expired due to Fees

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Gannon, Mark A., Crisler, Kenneth J., Marturano, Lawrence J., Needham, Michael L.
• Primary Examiner(s): Envall, Jr., Roy N.
• Assistant Examiner(s): BROWN, THOMAS
• Application Number:
  US08/161,881
• Time in Patent Office: 893 Days
• Field of Search: 371/32, 371/33, 370/94.1, 370/94.2, 370/95.2, 370/94.3, 370/60, 370/95.3, 340/825.5, 340/825.54
• US Class Current: 714/748
• CPC Class Codes: G06F 11/1443 Transmit or communication errors
• CPC Class Codes: H04L 1/1692 Physical properties of the supervisory signal, e.g. acknowledgement by energy bursts
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint

Abstract

A data message (201) is transmitted (301) to a plurality of communication units (103, 105, 107, and 109). The data message (201) is received (401) by the plurality of communication units, which determine (403) whether the quality of the received data message is acceptable. When at least one of the plurality of communication units determines that the received data message is of unacceptable quality, the at least one of the plurality of communication units transmits (411) an energy burst (203) in a predetermined time window. Upon detection of the energy burst (203), the transmitting device may retransmit (309) the data message to the plurality of communication units.

Claims

1. A method comprising the steps of:

transmitting a first data message to a plurality of communication units in a first time window and in a first frequency window;

receiving the first data message by the plurality of communication units;

determining, by each of the plurality of communication units, whether the quality of the received first data message is acceptable;

transmitting a second data message in a second time window and in the first frequency window, wherein the first time window and the second time window are different time windows;

when at least one of the plurality of communication units determines that the received data message is of unacceptable quality, transmitting, by the at least one of the plurality of communication units, an energy burst in a predetermined time window and a second frequency window, wherein the first frequency window and the second frequency window are different frequency windows, and wherein the predetermined time window falls within the second time window.

2. The method of claim 1, further comprising the step of retransmitting the data message to the plurality of communication units upon detection of the energy burst.

3. The method of claim 1, wherein the predetermined time window is temporally located immediately subsequent to the receipt of the data message.

4. The method of claim 1, wherein the energy burst is a radio frequency energy burst that is transmitted in a predetermined radio frequency band.

5. The method of claim 4, wherein the data message is transmitted in a radio frequency band other than the frequency band in which the energy burst is transmitted.

6. The method of claim 5, wherein a second data message is transmitted immediately subsequent to the transmission of the data message.

7. A method comprising the steps of:

transmitting a data message comprised of a multiplicity of data frames to a plurality of communication units;

receiving the data message by the plurality of communication units;

determining, by each of the plurality of communication units, whether the quality of each frame of the received data message is acceptable;

when at least one of the plurality of communication units determines that at least two frames of the received data message are of unacceptable quality, transmitting, by the at least one of the plurality of communication units, an energy burst in a predetermined time window and in, multiplicity of frequency band divisions. wherein each of the multiplicity of data frames corresponds to one of the multiplicity of frequency band divisions and wherein at least two of the energy burst transmissions are simultaneous.

8. The method of claim 7, wherein the predetermined time window is temporally located immediately subsequent to the receipt of the data message.

9. The method of claim 7, wherein the predetermined time window is comprised of a multiplicity of time segments.

10. The method of claim 9, wherein each frame of the data message corresponds to one of the multiplicity of time segments;

and when at least one of the plurality of communication units determines that at least two frames of the received data message are of unacceptable quality, transmitting, by the at least one of the plurality of communication units, an energy burst in at least one of the multiplicity of time segments.

11. The method of claim 7, further comprising the step of retransmitting the at least two frames of the received data message to the plurality of communication units after detection of the energy burst.

12. The method of claim 7, wherein all energy burst transmissions are simultaneous.

13. The method of claim 7, wherein the number of frequency band divisions is the same number as the number of data frames.

14. The method of claim 7, wherein the predetermined time window is comprised of a multiplicity of time segments and wherein each combination of a single time segment and a frequency band division corresponds to one of the multiplicity of flames of the data message.

15. The method of claim 7, wherein each of the multiplicity of data flames corresponds to a time-frequency pair, wherein each time frequency pair corresponds to one of the multiplicity of time segments and one of the multiplicity of frequency band divisions;

and when at least one of the plurality of communication units determines that at least two frames of the received data message is of unacceptable quality, transmitting, by the at least one of the plurality of communication units, an energy burst in at least one of the time-frequency pairs corresponding to the at least one frame of the received data message.

16. The method of claim 7, wherein the data message is transmitted in a radio frequency band other than the frequency band in which the energy burst is transmitted.

17. The method of claim 7, wherein a second data message is transmitted immediately subsequent to the transmission of the data message.

18. A communication unit comprising:

a receiver for receiving a data message transmitted in multiple frames;

a determiner, operatively coupled to the receiver, for determining whether the quality of each of the multiple flames of the received data message is acceptable; and

a transmitter, operatively coupled to the determiner, for simultaneously transmitting in a predetermined time window an energy burst in a different frequency window for each different frame that is of unacceptable quality when it is determined that two or more frames of the received data message is of unacceptable quality.

19. The communication unit of claim 18, wherein the predetermined time window is temporally located immediately subsequent to the receipt of the data message.

20. The communication unit of claim 18, wherein the energy burst is a radio frequency energy burst.

21. The communication unit of claim 18, wherein the data message is transmitted in a radio frequency band other than the frequency band in which the energy burst is transmitted.