method and apparatus for adjusting a communication timer in a communication network

• US 20030012222A1
• Filed: 02/01/2001
• Published: 01/16/2003
• Est. Priority Date: 02/01/2001
• Status: Active Grant

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Rinchiuso, Joseph
• Granted Patent: US 6,747,993 B2
• Time in Patent Office: Days
• US Class Current: 370/468
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/1809 Selective-repeat protocols
• CPC Class Codes: H04L 1/188 Time-out mechanisms
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

A method and apparatus for adjusting a communication timer (306) for a communication network is described herein and comprises a communication device (302) capable of receiving data indicating that a data transfer rate has varied from a previous data transfer rate to a new data transfer rate, determining the amount the data transfer rate has varied, and adjusting the communication timer (306) from one set timed interval to a different set timed interval to automatically account for the varying data transfer rate and for optimizing data transfer between networked components.

Claims

1. A method of optimizing communications between devices that are linked in a network, the method comprising:

transferring data transmitted via the network between predetermined devices to establish communications therebetween;

tracking changes in the rate at which data is being transferred between the predetermined devices due to network conditions;

determining an optimum data transfer rate based on the network conditions; and

adjusting communication timings of the predetermined devices according to the optimum data transfer rate determined.

2. A method according to claim 1, wherein adjusting communication timings includes increasing acknowledgment timers of the predetermined devices when network conditions have deteriorated and decreasing acknowledgment timers of the predetermined devices when network conditions have improved.

3. A method of optimizing data communications in a network comprising a transmitting component and a receiving component, the method comprising:

receiving data indicating that a data transfer rate has varied from a previous data transfer rate to a new data transfer rate;

determining an amount the data transfer rate has varied; and

adjusting a communication timer from one set timed interval to a different set timed interval to automatically account for the varying data transfer rate for optimizing data transfer between the networked components.

4. A method according to claim 3, the method further comprising:

sending an acknowledgment signal from the receiving component to the transmitting component;

initiating the communication timer to begin counting a set timed interval; and

monitoring the data transfer rate between the networked components.

5. A method according to claim 3, wherein the amount the communication timer is adjusted is determined by calculating the ratio of different transfer rates and multiplying by the frame size.

6. A method according to claim 3, wherein the data transfer rate has decreased and the amount the data transfer rate has varied is determined by dividing the previous data transfer rate by the new data transfer rate to provide a number of frames that accounts for the varying data transfer rate that is multiplied by the amount of time it takes to transmit a frame to arrive at the amount of time by which the one set timed interval is increased to the different set timed interval to account for the varying data transfer rate.

7. A method according to claim 3, wherein the data transfer rate has increased and the amount the data transfer rate has varied is determined by dividing the new data transfer rate by the previous data transfer rate to provide a number of frames that accounts for the varying data transfer rate that is multiplied by the amount of time it takes to transmit a frame to arrive at the amount of time by which the one set timed interval is decreased to the different set timed interval to account for the varying data transfer rate.

8. A method according to claim 3, wherein the receiving step includes receiving a data rate shift notification signal indicating that the data transfer rate has varied from a previous data transfer rate to a new data transfer rate.

9. A method according to claim 4, wherein the acknowledgment signal includes a request for data and the data transfer rate has decreased and the amount the data transfer rate has varied is determined by dividing the data requested by the data received to provide a number of frames that accounts for the varying data transfer rate that is multiplied by the amount of time it takes to transmit a frame to arrive at the amount of time by which the one set timed interval is increased to the different set timed interval to account for the varying data transfer rate.

10. A method according to claim 4, wherein the acknowledgment signal includes a request for data and the data transfer rate has increased and the amount the data transfer rate has varied is determined by dividing the data received by the data requested to provide a number of frames needed to account for the varying data transfer rate that is multiplied by the amount of time it takes to transmit a frame to arrive at the amount of time by which the one set timed interval is decreased to the different set timed interval to account for the varying data transfer rate.

11. A method according to claim 3, wherein the receiving step includes receiving an unrequested data signal indicating that the data transfer rate has varied from a previous data transfer rate to a new data transfer rate.

12. A method according to claim 3, wherein the adjusting step includes adjusting the communication timer proportionally to the amount the data transfer rate has varied.

14. A system according to claim 13, wherein the generated acknowledgment signal is a negative acknowledgment (NAK) signal and the timer is automatically adjusted from one set timed interval to a different set timed interval by the processor upon receipt of a data rate shift notification signal.

15. A system according to claim 14, wherein the data rate shift notification signal comprises a data rate shift factor and the different set timed interval of the timer is about equal to the data rate shift factor multiplied by the amount of time it takes to transmit one frame of data.

16. A system according to claim 13, wherein the generated acknowledgment signal is a negative acknowledgment (NAK) signal and the timer is automatically adjusted from one set timed interval to a different set timed interval by the processor upon receipt of an unrequested data signal.

17. A system according to claim 16, wherein the amount the timer is adjusted is determined by taking the amount of data requested divided by the amount of data received to obtain a rate shift factor and multiplying the rate shift factor by the amount of time necessary to transmit one frame of data.

18. A system according to claim 16, wherein the amount the timer is adjusted is determined by taking the amount of data received divided by the amount of data requested and multiplying by the amount of time necessary to transmit one frame of data.

20. The apparatus of claim 19, wherein the acknowledgment is a negative acknowledgment (NAK) signal indicating that an error has occurred in receiving data and requesting retransmission of such data.

21. The apparatus of claim 19, wherein the acknowledgment is an

acknowledgment (ACK) signal indicating that the data has been received successfully.

22. The apparatus of claim 19, wherein the communication device is a transceiver and the processor detects data transfer rate change via reception of a data rate shift notification signal.

23. The apparatus of claim 19, wherein the communication device is a transceiver and the processor detects data transfer rate change via reception of an unrequested data signal.

13. A system for optimizing data communications in a network, the system comprising:

a transmitter for transmitting data to a receiver at a variety of data transfer rates;

a receiver for receiving data from the transmitter;

a processor for determining if the transmitted data has been received and for generating an acknowledgment signal in response to this determination; and

an adjustable timer that tracks the amount of time it takes to receive data after the acknowledgment signal has been generated and which is automatically adjusted from one set timed interval to a different set timed interval by the processor to account for varying data transfer rates.

19. An apparatus for optimizing data communication in a network, the apparatus comprising:

a communication device capable of receiving data at a variety of data transfer rates and transmitting an acknowledgment corresponding to the received data;

a communication timer for tracking the amount of time it takes to receive data after transmitting the acknowledgment; and

a processor configured to detect when the data transfer rate has changed and to adjust the communication timer from one set timed interval to a different set timed interval to account for the varying data transfer rate